JP2023167199A - Surge recovery structure, electrical machinery equipment for aircraft and electrical machinery equipment for wind power generation - Google Patents

Abstract

To provide a surge recovery structure that is suppressed from rising in cost even when a housing including a non-metal material is used, electrical machinery equipment for aircraft that comprises the surge recovery structure, and electrical machinery equipment for wind power generation that comprises the surge recovery structure.SOLUTION: In electrical machinery equipment 10 comprising an inverter device 11, a surge recovery path 61 which extends from a load 23 to the load 23 via load floating capacitance 51, a resistor 31, resistor-wiring capacitance 41, and an inverter 17 is constituted as a surge recovery structure. The resistor 31 of the surge recovery path 61 is so set that in a high-frequency band of several kHz to tens of MHz that a main frequency component of a surge has, the impedance when the surge flows through the surge recovery path 61 is lower than the impedance when the surge flows to the ground.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a surge recovery structure, electrical equipment for aircraft, and electrical equipment for wind power generation.

One example of power conversion devices is an inverter device. An inverter device has the function of converting alternating current having a certain voltage and frequency into direct current, and further converting the direct current into alternating current having a desired voltage and frequency. Electrical equipment including such an inverter device is provided with a structure for recovering surges generated inside and outside the inverter device (Patent Document 1 and Patent Document 2).

In particular, in Patent Document 1, in a motor drive system that drives a motor connected to the output end of an inverter device via a cable, a grounding wire is connected to the casing of the inverter device in order to reduce conductive noise such as surge. However, structures have been proposed that prevent surges from escaping into the ground.

Patent No. 3648123 (Japanese Unexamined Patent Publication No. 2001-286152) Japanese Patent Application Publication No. 2014-39376

In conventional surge recovery structures, in order to prevent surges (conducted noise) from escaping to the ground, the impedance is lower than when surges flow through the ground by using the inverter housing and grounding wire together. A path has been formed.

However, as the housing, for example, a housing containing a non-metallic material such as carbon fiber reinforced plastic may be used. The electrical conductivity of carbon fiber reinforced plastics and the like is said to be about one thousandth of that of metal. Therefore, with a case including a non-metallic material, there is a problem in that it is difficult to form a path with lower impedance than when a surge flows through the ground, just by using the case and a grounding wire together.

In addition, when applying a housing containing non-metallic materials, a surge countermeasure component with a large withstand capacity is provided to prevent surges caused by the impedance of the housing containing non-metallic materials from being applied to the inverter device and the load. This may increase manufacturing costs. Furthermore, it is necessary to secure a place to install such surge countermeasure components, which may impede miniaturization.

The present disclosure has been made in order to solve the problems that occur in surge recovery when a casing containing a non-metallic material is used, and one purpose is to It is an object of the present invention to provide a surge recovery structure capable of recovering surges and which has a reduced manufacturing cost.Another object is to provide an aircraft electrical equipment equipped with such a surge recovery structure. Another object is to provide electrical equipment for wind power generation equipped with such a surge recovery structure.

A surge recovery structure according to the present disclosure includes a housing, a power source, an inverter, a load, wiring, one or more resistors, and a resistor-wiring capacitance. The housing includes a non-metallic material having a first conductivity, and is electrically connected to at least one of the earth and the thundercloud. A power source, an inverter, and a load are each housed within the housing. The wiring electrically connects the power source and the inverter. The one or more resistors are electrically connected to the load and have a second conductivity higher than the first conductivity. The resistor-wiring capacitance is interposed between the resistor and the wiring, and electrically connects the resistor and the wiring. A surge recovery path is constructed from the load to the load via the resistor, the capacitance between the resistor and the wiring, and the inverter. The first impedance of the surge recovery path is smaller than the second impedance of the path from the load to the load via the ground and/or thunderclouds, the capacitance between the ground and/or the thunderclouds and wiring, and the inverter.

The electrical aircraft equipment according to the present disclosure is mounted on an aircraft and includes the surge recovery structure described above. The housing has an aircraft reinforcement structure. The resistor includes a reinforcing structure.

An electrical device for wind power generation according to the present disclosure is an electrical device for wind power generation that is mounted on a wind power generation device and includes the above-mentioned surge recovery structure. The housing includes a nacelle containing a wind power generator. The resistor includes a nacelle.

According to the surge recovery structure according to the present disclosure, a surge recovery path is configured from the load to the load via the resistor, the capacitance between the resistor and the wiring, and the inverter. The first impedance of the surge recovery path is smaller than the second impedance of the path from the load to the load via the ground and/or thunderclouds, the capacitance between the ground and/or the thunderclouds and wiring, and the inverter. As a result, it is possible to obtain a surge recovery structure with reduced manufacturing costs in an electrical device having a casing containing a non-metallic material.

According to the electrical equipment for an aircraft according to the present disclosure, by including the surge recovery structure described above, it is possible to obtain an electrical equipment for an aircraft with reduced manufacturing costs.

According to the electrical equipment for wind power generation according to the present disclosure, by including the surge recovery structure described above, it is possible to obtain an electrical equipment for wind power generation with reduced manufacturing costs.

1 is a diagram including a circuit diagram showing a configuration of an electrical device including a surge recovery structure according to a first embodiment; FIG. FIG. 3 is a diagram including a circuit diagram showing a surge recovery path in the same embodiment. FIG. 7 is a diagram including a circuit diagram showing a surge recovery path as a comparative example in the same embodiment. FIG. 2 is a first diagram schematically showing a structural example of a resistor in the same embodiment. FIG. 2 is a second diagram schematically showing a structural example of a resistor in the same embodiment. FIG. 7 is a third diagram schematically showing a structural example of a resistor in the same embodiment. FIG. 4 is a fourth diagram schematically showing a structural example of a resistor in the same embodiment. FIG. 7 is a characteristic diagram as a comparative example showing changes in voltage over time to explain the surge reduction effect in the same embodiment. FIG. 7 is a characteristic diagram showing a voltage change over time to explain the surge reduction effect in the same embodiment. FIG. 7 is a diagram including a circuit diagram showing the configuration of an electrical device equipped with a surge recovery structure according to a second embodiment. FIG. 3 is a diagram schematically showing a structural example of a resistor in the same embodiment. FIG. 7 is a diagram including a circuit diagram showing the configuration of an electrical device equipped with a surge recovery structure according to a third embodiment. FIG. 3 is a diagram including a circuit diagram showing a surge recovery path in the same embodiment. FIG. 12 is a perspective view showing an aircraft equipped with aircraft electrical equipment according to a fourth embodiment. FIG. 2 is a diagram including a circuit diagram showing the configuration of an aircraft electric device equipped with a surge recovery structure in the same embodiment. FIG. 3 is a diagram including a circuit diagram showing a surge recovery path in the same embodiment. FIG. 7 is a diagram including a circuit diagram showing a surge recovery path as a comparative example in the same embodiment. FIG. 7 is a perspective view showing a wind power generation device equipped with an electrical equipment for wind power generation according to a fifth embodiment. FIG. 2 is a diagram including a circuit diagram showing the configuration of an electrical equipment for wind power generation equipped with a surge recovery structure in the same embodiment. FIG. 3 is a diagram including a circuit diagram showing a surge recovery path in the same embodiment. FIG. 7 is a diagram including a circuit diagram showing a surge recovery path as a comparative example in the same embodiment.

Embodiment 1.
A surge recovery structure in electrical equipment 10 having inverter device 11 according to Embodiment 1 will be described. As shown in FIG. 1, the inverter device 11 includes a DC power source 15, an inverter 17, and a load 23. Inverter 17 and load 23 are electrically connected. Driving of the load 23 is controlled by the inverter 17. The inverter 17 includes, for example, a switching element as a semiconductor element and a diode.

Power supply 15 and inverter 17 are electrically connected by wiring 19. The wiring 19 includes a first wiring 19a and a second wiring 19b. The positive electrode of the power supply 15 and the inverter 17 are electrically connected by the first wiring 19a. The negative electrode of the power supply 15 and the inverter 17 are electrically connected by the second wiring 19b. The inverter 17 and the load 23 are electrically connected by a shielded cable 27. The shielded cable 27 has a shielded wire 27a.

Power source 15, inverter 17, and load 23 are housed within housing 13. The housing 13 includes, for example, a non-metallic material such as carbon fiber reinforced plastic. Further, the power supply 15 and the inverter 17 are housed within an inverter housing 21. The load 23 is housed in a load housing 25.

The load 23 and the load housing 25 are electrically connected by a grounding wire 35a. The load housing 25 and the housing 13 are electrically connected by a grounding wire 35b. Inverter housing 21 and housing 13 are electrically connected by a grounding wire 35c.

The housing 13 is electrically connected to the ground 39 or a reference potential formed by a thundercloud via an equivalent impedance 37 formed by wiring or an arc. Further, the ground 39 and the wiring 19 are electrically connected via a ground-to-wiring capacitance 47. The ground-to-wire capacitance 47 includes a ground-to-first wiring capacitance 47a and a ground-to-second wiring capacitance 47b.

A resistor 31 electrically connected to the load 23 is arranged within the inverter housing 21 . In this inverter device 11, the load 23 and the resistor 31 are electrically connected via a load stray capacitance 51 and a connection line 29 that electrically connects the load housing 25 and the resistor 31. The connection line 29 is connected to one end of the resistor 31 . Note that the load stray capacitance 51 is a stray capacitance formed between the motor windings assumed as the load 23 and the motor frame.

The other end side of the resistor 31 and the wiring 19 are electrically connected via a resistor-wiring capacitance 41. The resistor-to-wiring capacitance 41 includes a resistor-to-first wiring capacitance 41a and a resistor-to-second wiring capacitance 41b. The other end side of the resistor 31 and the first wiring 19a are electrically connected via the resistor-first wiring capacitance 41a. The other end side of the resistor 31 and the second wiring 19b are electrically connected via the resistor-second wiring capacitance 41b.

The housing 13 and the wiring 19 are electrically connected via a housing-wiring capacitance 43. The casing-to-wiring capacitance 43 includes a casing-to-first wiring capacitance 43a and a casing-to-second wiring capacitance 43b. Inverter housing 21 and wiring 19 are electrically connected via inverter housing-wiring capacitance 49 . The inverter housing-to-wiring capacitance 49 includes an inverter housing-to-first wiring capacitance 49a and an inverter housing-to-second wiring capacitance 49b.

Note that the resistor-to-wiring capacitance 41, the casing-to-wiring capacitance 43, and the inverter casing-to-wiring capacitance 49 are preferably capacitances such as ceramic capacitors or film capacitors, but may also be stray capacitances generated due to the structure. .

As shown in FIG. 2, in the electrical equipment 10 equipped with the above-mentioned inverter device 11, the surge recovery structure includes a surge recovery structure in which the surge is A surge recovery path 61 leading to the load 23 is configured (see thick solid line). Note that, in order to avoid complication of the drawing, in the inverter 17, one of the three phases is typically marked with a solid line. The same applies to the corresponding drawings described later.

Here, the resistor 31 (resistance value) in the surge recovery path 61 will be explained. The impedance of the resistor 31 (resistance value) in the surge recovery path 61 when a surge flows through the surge recovery path 61 in the high frequency band of several kHz to several tens of MHz, which is the main frequency component of the surge, is The impedance is set to be lower than the impedance when flowing.

Specifically, as shown in FIG. 3, the path from the load 23 to the load 23 via the grounding wire 35a, the grounding wire 35b, the housing 13, the earth 39 or the thunder cloud, the earth-wiring capacitance 47, and the inverter 17 (thick dotted line The resistor 31 is set so that the impedance of the surge recovery path 61 is lower than the impedance of the surge recovery path 61.

As a result, even if the housing 13 is made of a non-metallic material such as carbon fiber reinforced plastic or plastic, which has a conductivity several thousand times lower than that of metal, the surge will be large. In addition, it is possible to suppress the increase in the size of surge countermeasure components, and an inexpensive surge recovery structure can be obtained.

Next, a specific structural example of the resistor 31 will be explained. As shown in FIG. 4 or 5, a heat radiator 55 that radiates heat generated from the semiconductor element 53 or the like may be used as the resistor 31. In FIG. 4, a case is shown in which the heat radiator 55 is housed within the inverter housing 21. FIG. 5 shows a case where the heat radiator 55 is arranged outside the inverter housing 21.

Further, as shown in FIG. 6, a spacer 57 and a shield plate 56 arranged on a substrate 54 may be used as the resistor 31. In FIG. 6, a case is shown in which the shield plate 56 is placed on the substrate 54 with a spacer 57 interposed therebetween, so as to cover the semiconductor element 53 and the like.

Furthermore, as shown in FIG. 7, a ground pattern 58 (ground pattern) provided on the substrate 54 may be used as the resistor 31. Further, as shown in each of FIGS. 5 to 7, the shield wire 27a of the shield cable 27 may be electrically connected.

Next, regarding the surge reduction effect of the surge recovery path 61 (surge recovery structure) in the electrical equipment 10 described above, the surge when lightning current is applied to the housing 13 was evaluated by electromagnetic analysis.

First, the conditions for electromagnetic analysis will be explained. A lightning current waveform defined by the lightning test standard for aircraft (SAE APR5412-B) was applied to the casing 13 containing a non-metallic material. The case-to-wiring capacitance 43 between the inverter 17 and the case 13 was set to 100 pF for each phase. Further, the load stray capacitance 51 was set to 10 nF. Furthermore, for the housing 13, it was assumed that the conductivity of carbon fiber reinforced plastics (CFRP) in the thickness direction, which has the lowest conductivity, was 5.58×10 ² S/m.

Next, a characteristic diagram obtained by performing an electromagnetic analysis of a surge under these conditions will be described. As shown in FIG. 8 (comparative example), it was found that a surge having a peak value of about -10 kV appeared at the position of the inverter device 11. On the other hand, as shown in FIG. 9, when the surge recovery path 61 is provided, a surge having a peak value of about -8 kV appears, and it is confirmed that the surge can be suppressed compared to the comparative example. .

In the electrical equipment 10 described above, a DC power source was used as an example of the power source 15, but the surge recovery path 61 having the resistor 31 can also be applied when converting an AC power source to a DC power source. It is possible. In addition, although the case has been described as an example in which the load 23 is housed in the load housing 25 and the load 23 and the load housing 25 are electrically connected by the grounding wire 35a, it is not always necessary to provide the load housing 25. In this case, the grounding wire 35a is unnecessary. Furthermore, as the inverter housing 21, a metal inverter housing 21 is usually applied, but an inverter housing 21 formed from a non-metallic material such as plastic may also be applied.

Embodiment 2.
In the electrical equipment 10 described above, a case has been described in which one resistor 31 is applied. Here, an electric device 10 including a plurality of resistors 31 will be described.

As shown in FIG. 10, in the electrical equipment 10, a resistor 31a and a resistor 31b are provided as the resistor 31. As an example of a specific structure of the two resistors 31, FIG. 11 shows a configuration in which two heat sinks 52 are electrically connected in parallel.

As shown in FIGS. 10 and 11, a connection line 29 is electrically connected to one end of the resistor 31a. The other end side of the resistor 31a and the wiring 19 are electrically connected via a resistor-wiring capacitance 41. The resistor-to-wiring capacitance 41 includes a resistor-to-first wiring capacitance 41a and a resistor-to-second wiring capacitance 41b.

A connecting wire 29 is electrically connected to one end of the resistor 31b. The other end side of the resistor 31b and the wiring 19 are electrically connected via a resistor-wiring capacitance 41. The resistor-wiring capacitor 41 has a capacitor 41c and a capacitor 41d.

The resistor 31 (31a, 31b) connects the load 23 to the load stray capacitance 51, the resistor 31 (31a, 31b), and the resistor 31 (31a, 31b) in the high frequency band of several kHz to several tens of MHz, which is the main frequency component of surges. The impedance of the surge recovery path 61 that reaches the load 23 via the inter-wiring capacitance 41 (41a, 41b, 41c, 41d) and the inverter 17 is lower than the impedance when the surge flows through the ground (see the thick dotted line in FIG. 3). It is set to be the impedance. Note that the configuration other than this is the same as the configuration of the electrical equipment 10 shown in FIG. 1, so the same members are denoted by the same reference numerals, and the description thereof will not be repeated unless necessary.

In the electrical equipment 10 described above, the plurality of resistors 31 are electrically connected in parallel. When the resistor 31 is composed of a plurality of (for example, N) resistors 31, the impedance of the resistor 31 as a whole is reduced to 1/N. As a result, surges can be suppressed even when the housing 13 includes a non-metallic material having a conductivity that is several thousandths or less of that of metal. Further, it is possible to prevent surge countermeasure components from increasing in size. Note that examples of non-metallic materials having electrical conductivity that are several thousandths or less of that of metal include carbon fiber reinforced plastics and plastics.

Embodiment 3.
Here, a description will be given of an electrical device to which a housing including a non-metallic material is applied, in which a metal portion and a non-metallic portion are specified.

As shown in FIG. 12, in the electrical equipment 10, a metal portion 13a and a non-metal portion 13b are specified in the housing 13 containing a non-metal material. The metal portion 13a functions as a resistor. One end of the metal portion 13 a and the other end of the resistor 31 are electrically connected by a connecting wire 30 .

The other end side of the metal portion 13a and the wiring 19 are electrically connected via a capacitance 45 between the housing and the wiring. The casing-to-wiring capacitance 45 includes a casing-to-first wiring capacitance 45a and a casing-to-second wiring capacitance 45b. The other end side of the metal portion 13a and the first wiring 19a are electrically connected via the casing-first wiring capacitance 45a. The other end side of the metal portion 13a and the second wiring 19b are electrically connected via the casing-second wiring capacitance 45b.

The non-metallic portion 13b and the wiring 19 are electrically connected via a capacitance 45 between the housing and the wiring. The casing-to-wiring capacitance 45 includes a casing-to-first wiring capacitance 45c and a casing-to-second wiring capacitance 45d. The non-metallic portion 13b and the first wiring 19a are electrically connected via the casing-first wiring capacitance 45c. The non-metallic portion 13b and the second wiring 19b are electrically connected via a capacitance 45d between the casing and the second wiring.

As shown in FIG. 13, in the electrical equipment 10 described above, the surge recovery path 61 as a surge recovery structure includes a surge recovery path 61a and a surge recovery path 61b. The surge recovery path 61a is a path from the load 23 to the load 23 via the load stray capacitance 51, the resistor 31, the resistor-wiring capacitance 41 (41a, 41b), and the inverter 17. The surge recovery path 61b is a path from the load 23 to the load 23 via the load stray capacitance 51, the resistor 31, the metal part 13a, the capacitor-to-wiring capacitance 45 (45a, 45b), and the inverter 17. The impedance of the resistor 31 of the surge recovery path 61 in the high frequency band of several kHz to several tens of MHz, which is the main frequency component of the surge, is the impedance when the surge flows through the ground (see the thick dotted line in FIG. 3). The impedance is set to be lower than that of the

Note that the configuration other than this is the same as the configuration of the electrical equipment 10 shown in FIG. 1, so the same members are denoted by the same reference numerals, and the description thereof will not be repeated unless necessary.

In the electrical equipment 10 described above, the surge recovery path 61 includes the metal portion 13a of the housing 13. Thereby, the number of new resistors 31 to be provided in the surge recovery path 61 can be suppressed, and as a result, the production cost of the surge recovery structure (surge recovery path 61) can be suppressed.

Embodiment 4.
Here, as an electrical equipment equipped with a surge recovery structure, an aircraft electrical equipment mounted on an aircraft will be described. As shown in FIG. 14, a reinforcing structure 73 including a frame 74 and stringers 75 is employed in the fuselage of the aircraft 71 (see FIG. 15). The frame 74 is arranged along the longitudinal direction of the body. The stringer 75 is arranged along the circumferential direction of the body so as to intersect with the frame 74.

In the aircraft electrical equipment 72, the reinforcing structure 73 is applied as a resistor in a surge recovery path as a surge recovery structure. As shown in FIG. 15, the reinforcing structure 73 formed by the frame 74 and the stringer 75 includes a metal portion 73a and a non-metal portion. In the reinforcing structure 73, the metal portion 73a is used as the resistor 31. The reinforcing structure 73 corresponds to the casing 13 including a non-metallic material shown in FIG. 1 and the like. The inverter housing 21 and the load housing 25 are housed within the reinforcing structure 73 serving as the housing 13 .

A connecting wire 29 is electrically connected to one end of the metal portion 73a serving as the resistor 31. The other end side of the metal portion 73a and the wiring 19 are electrically connected via the resistor-wiring capacitance 45. The casing-to-wiring capacitance 45 includes a casing-to-first wiring capacitance 45a and a casing-to-second wiring capacitance 45b. Note that the other configurations are substantially the same as the configuration of the electrical equipment 10 shown in FIG. .

As shown in FIG. 16, in the above-described aircraft electrical equipment 72, the load 23 is connected to the load 23 via the load stray capacitance 51, the metal part 73a as the resistor 31, the case-wiring capacitance 45, and the inverter 17. A surge recovery path 61 is formed as a surge recovery structure.

The impedance of the surge recovery path 61 is determined from the load 23, the load stray capacitance 51, the equivalent impedance 37, the ground 39 or thundercloud, the ground-to-wiring capacitance 47, and the inverter 17 in the aircraft electrical equipment as a comparative example shown in FIG. The impedance is set to be lower than the impedance of the path 161a (see the thick dotted line) which reaches the load 23 via the . The ground-to-wire capacitance 47 includes a ground-to-first wiring capacitance 47a and a ground-to-second wiring capacitance 47b.

Further, the impedance of the surge recovery path 61 is determined from the load 23 in the aircraft electrical equipment as a comparative example shown in FIG. 23 (see thick dotted line). The casing-to-wiring capacitance 45 includes a casing-to-first wiring capacitance 45c and a casing-to-second wiring capacitance 45d.

In the above-described aircraft electrical equipment 72, by using the metal portion 73a of the reinforcing structure 73 as the resistor 31, the surge recovery path 61 as a surge recovery structure can be configured at low cost without preparing a new resistor. be able to.

As the resistor 31 in the surge recovery path 61, apart from the reinforcing structure 73, as described in the first embodiment, a heat radiator, a shield wire of a shield cable, a shield plate, etc. may be applied. In this case, it is possible to prevent the surge current from flowing through the reinforcement structure, thereby preventing the reinforcement structure from deteriorating due to the application of the surge current.

Note that when a lightning surge is applied to an aircraft, the equivalent impedance 37 due to wiring or arc becomes the arc resistance value between the aircraft and the thundercloud. Generally speaking, when the casing is grounded through an inductance component of wiring or a resistance, a surge (voltage) increases depending on the grounding impedance of the casing. Further, when the casing is grounded, even if the impedance of the casing itself is high, if the impedance from the casing to the ground point is low, the surge problem is unlikely to occur.

In the above-described aircraft electrical equipment 72, the surge recovery path 61 can also recover surges from the following systems. That is, the casing 13 (reinforcement structure 73) is electrically connected to the reference potential formed by the earth 39 or a thundercloud via an equivalent impedance 37 formed by wiring or an arc, and the casing 13 is electrically connected to a reference potential formed by the earth 39 or a thundercloud through an equivalent impedance 37 formed by wiring or an arc. Surges can be recovered even from systems that are not at ground potential in a high frequency band of several tens of MHz.

As a surge recovery structure (surge recovery path 61), if the inverter housing 21 is made of metal and the load housing 25 is also made of metal, it is also possible to electrically connect the inverter housing 21 and the load housing 25 with a grounding wire. It will be done.

However, in the case of aircraft electrical equipment, the inverter and the load may be placed approximately 30 meters apart. In such a case, it is assumed that the weight and cost of the grounding wire that electrically connects the inverter housing and the load housing will become a problem.

On the other hand, in the surge recovery path 61 of the aircraft electrical equipment 72 described above, metal parts (structures) such as frames and stringers serving as a reinforcing structure are used as the resistor 31, thereby adding new It is possible to minimize the number of parts involved, and it is possible to achieve weight reduction and cost reduction.

Generally, when using CFRP in an aircraft, a method is known in which a metal mesh layer is inserted into the CFRP to ensure lightning resistance. In such a structure, the resistor 31 may be a combination of a metal mesh layer and a reinforcing structure (frame and stringer). As a result, the number of newly provided resistors can be reduced, which can contribute to reducing the production cost of the surge recovery structure (surge recovery path).

Embodiment 5.
Here, an electrical equipment for wind power generation installed in a wind power generator will be described as an electrical equipment equipped with a surge recovery structure. As shown in FIG. 18, the wind power generator 81 is equipped with a nacelle 83 that houses a generator and the like. Nacelle 83 includes a metal portion 83a and a non-metal portion 83b.

In the wind power generation electrical equipment 82, the metal portion 83a of the nacelle 83 is used as a resistor of a surge recovery path as a surge recovery structure. As shown in FIG. 19, the nacelle 83 corresponds to the housing 13 containing a non-metallic material shown in FIG. 1 and the like. The inverter housing 21 and the load housing 25 are housed in the nacelle 83 serving as the housing 13 .

A connecting wire 29 is electrically connected to one end of the metal portion 83a serving as the resistor 31. The other end side of the metal portion 83a and the wiring 19 are electrically connected via the resistor-wiring capacitance 45. The resistor-to-wiring capacitance 45 includes a resistor-to-first wiring capacitance 45a and a resistor-to-second wiring capacitance 45b. Note that the other configurations are substantially the same as the configuration of the electrical equipment 10 shown in FIG. .

As shown in FIG. 20, in the wind power generation electrical equipment 82 described above, the load 23 is connected to the load 23 via the load stray capacitance 51, the metal part 83a as the resistor 31, the casing-wiring capacitance 45, and the inverter 17. , a surge recovery path 61 is formed as a surge recovery structure.

The impedance of the surge recovery path 61 is from the load 23, through the load stray capacitance 51, the equivalent impedance 37, the ground, the ground-wiring capacitance 47, and the inverter 17 in the wind power generation electrical equipment as a comparative example shown in FIG. The impedance is set to be lower than the impedance of the path 161a (see thick dotted line) leading to the load 23. The ground-to-wire capacitance 47 includes a ground-to-first wiring capacitance 47a and a ground-to-second wiring capacitance 47b.

In addition, the impedance of the surge recovery path 61 is as follows from the load 23, the load stray capacitance 51, the non-metallic part 83b, the case-wiring capacitance 45 (45c, 45d) in the wind power generation electrical equipment as a comparative example shown in FIG. ) and the impedance of the path 161b (see the thick dotted line) leading to the load 23 via the inverter 17. Note that the casing-to-wiring capacitance 45 includes a casing-to-first wiring capacitance 45c and a casing-to-second wiring capacitance 45d.

In the wind power generation electrical equipment 82 described above, by applying the metal portion 83a of the nacelle 83 as the resistor 31, the surge recovery path 61 as a surge recovery structure can be configured at low cost without preparing a new resistor. be able to.

Note that when a lightning surge is applied to the electrical equipment for wind power generation, the equivalent impedance 37 due to wiring or arc becomes the wiring inductance between the electrical equipment for wind power generation and the ground. In the wind power generation electrical equipment 82 described above, the surge recovery path 61 can also recover surges from the following systems. That is, the casing 13 (nacelle 83) is electrically connected to the reference potential constituted by the earth via an equivalent impedance 37 formed by wiring or an arc, and the casing 13 is electrically connected to a reference potential constituted by the earth via an equivalent impedance 37 formed by wiring or an arc. Surges can be recovered even from systems that are not at ground potential in the high frequency band.

Note that the surge recovery structures described in each embodiment can be combined in various ways as necessary. Further, in each of the embodiments, the case where the power supply 15 is a DC power supply has been described, but the power supply 15 may be one using an AC and rectifier circuit such as a three-phase three-wire or three-phase four-wire system.

The embodiment disclosed this time is an example and is not limited thereto. The present disclosure is indicated by the claims, not the scope described above, and is intended to include all changes within the meaning and range equivalent to the claims.

Note that the present disclosure includes the following aspects.
(Additional note 1)
a casing that includes a non-metallic material having a first conductivity and is electrically connected to at least one of the earth and a thundercloud;
a power source, an inverter, and a load, each housed in the housing;
Wiring that electrically connects the power source and the inverter;
one or more resistors electrically connected to the load and having a second conductivity higher than the first conductivity;
a resistor-wiring capacitance interposed between the resistor and the wiring and electrically connecting the resistor and the wiring;
Equipped with
A surge recovery path is configured from the load to the load via the resistor, the resistor-wiring capacitance, and the inverter,
The first impedance of the surge recovery path is a path from the load to the load via at least one of the ground and the thundercloud, a capacitance between the ground and/or the thundercloud and the wiring, and the inverter. A surge recovery structure that is smaller than the second impedance of.

(Additional note 2)
The inverter is
a circuit board;
The surge recovery structure according to supplementary note 1, including a power semiconductor element mounted on the circuit board.

(Additional note 3)
The inverter has a heat radiator that radiates heat generated from the power semiconductor element,
The surge recovery structure according to supplementary note 2, wherein the resistor includes the heat radiator.

(Additional note 4)
The inverter has a conductive shield plate disposed on the circuit board via a conductive spacer so as to cover the circuit board,
The surge recovery structure according to appendix 2 or 3, wherein the resistor includes the conductive spacer and the conductive shield plate.

(Appendix 5)
The inverter has a ground pattern formed on the circuit board,
The surge recovery structure according to any one of Supplementary Notes 2 to 4, wherein the resistor includes the ground pattern.

(Appendix 6)
A shielded cable including a shielded wire electrically connects the inverter and the load,
The surge recovery structure according to any one of Supplementary Notes 2 to 5, wherein the resistor includes the shield wire.

(Appendix 7)
The resistor includes one resistor and another resistor,
The surge recovery structure according to any one of Supplementary Notes 1 to 6, wherein the one resistor and the other resistor are electrically connected in parallel.

(Appendix 8)
A case-to-wiring capacitor interposed between the case and the wiring and electrically connecting the case and the wiring,
The casing is
a nonmetallic part formed from the nonmetallic material;
A metal part formed from a metal material,
the resistor is electrically connected between the load and the metal part,
The surge recovery structure according to any one of Supplementary Notes 1 to 7, wherein the capacitance between the casing and the wiring includes the capacitance between the metal part and the wiring.

(Appendix 9)
The capacitance between the casing and the wiring includes the capacitance between the non-metallic part and the wiring,
including a grounding wire that electrically connects the load and the casing;
The resistor is configured such that the first impedance is a third impedance of a path from the load to the load via the ground wire, the casing, the reference potential of the casing, the capacitance between the nonmetallic part and the wiring, and the inverter. The surge recovery structure according to appendix 8, which is set to be lower than the impedance.

(Appendix 10)
having a metal casing that houses the inverter;
The surge recovery structure according to any one of Supplementary Notes 1 to 9, wherein the metal casing is housed within the casing.

(Appendix 11)
An electrical aircraft equipment installed on an aircraft and equipped with the surge recovery structure according to any one of Supplementary Notes 1 to 10,
the housing has an aircraft reinforcement structure;
An electrical equipment for an aircraft, wherein the resistor includes the reinforcing structure.

(Appendix 12)
12. The aircraft electrical equipment according to appendix 11, wherein the casing is electrically connected to a reference potential formed by either the earth or the thundercloud via a resistor.

(Appendix 13)
An electrical equipment for wind power generation, which is installed in a wind power generation device and is equipped with the surge recovery structure according to any one of Supplementary Notes 1 to 10,
The housing includes a nacelle housing a wind power generator,
An electrical equipment for wind power generation, in which the resistor includes the nacelle.

(Appendix 14)
The wind power generation device is installed on the ground,
14. The electrical equipment for wind power generation according to appendix 13, wherein the housing is electrically connected to a reference potential of the earth through a ground wiring that electrically connects the earth and the nacelle.

INDUSTRIAL APPLICABILITY The present disclosure can be effectively used as a surge countermeasure for electrical equipment to which a housing including a non-metallic material is applied.

10 electrical equipment, 11 inverter device, 13 housing, 13a metal part, 13b non-metallic part, 15 power supply, 17 inverter, 19 wiring, 19a first wiring, 19b second wiring, 21 inverter housing, 23 load, 25 load housing, 27 Shield cable, 27a Shield wire, 29, 30 Connection wire, 31, 31a, 31b Resistor, 35a, 35b, 35c Ground wire, 37 Equivalent impedance, 39 Earth, 41 Resistor-wiring capacitance, 41a Resistor-No. 1 wiring capacitance, 41b resistor-second wiring capacitance, 41c resistor-first wiring capacitance, 41d resistor-second wiring capacitance, 43 casing-wiring capacitance, 43a casing-first wiring capacitance , 43b Capacitance between the housing and the second wiring, 45 Capacitance between the housing and the wiring, 45a Capacitance between the metal part and the first wiring, 45b Capacitance between the metal part and the second wiring, 45c Capacitance between the non-metallic part and the first wiring, 45d Capacitance between metal part and second wiring, 47 Capacitance between earth and wiring, 47a Capacitance between earth and first wiring, 47b Capacitance between earth and second wiring, 49 Capacitance between inverter housing and wiring, 49a Between inverter housing and first wiring Capacity, 49b Inverter housing-second wiring capacitance, 51 Load capacity, 53 Semiconductor element, 54 Substrate, 55 Heatsink, 56 Shield plate, 57 Spacer, 58 Grounding pattern, 61 Surge recovery structure, 71 Aircraft, 72 Aircraft electrical equipment Equipment, 73 Reinforcement structure, 73a Metal part, 73b Non-metal part, 74 Frame, 75 Stringer, 81 Wind power generation device, 82 Electric equipment for wind power generation, 83 Nacelle, 83a Metal part, 83b Non-metal part.

Claims (14)

a casing that includes a non-metallic material having a first conductivity and is electrically connected to at least one of the earth and a thundercloud;
a power source, an inverter, and a load, each housed in the housing;
Wiring that electrically connects the power source and the inverter;
one or more resistors electrically connected to the load and having a second conductivity higher than the first conductivity;
a resistor-wiring capacitance interposed between the resistor and the wiring and electrically connecting the resistor and the wiring;
Equipped with
A surge recovery path is configured from the load to the load via the resistor, the resistor-wiring capacitance, and the inverter,
The first impedance of the surge recovery path is a path from the load to the load via at least one of the ground and the thundercloud, a capacitance between the ground and/or the thundercloud and the wiring, and the inverter. The surge recovery structure is smaller than the second impedance of the surge recovery structure. The inverter is
a circuit board;
The surge recovery structure according to claim 1, further comprising a power semiconductor element mounted on the circuit board. The inverter has a heat radiator that radiates heat generated from the power semiconductor element,
The surge recovery structure according to claim 2, wherein the resistor includes the heat radiator. The inverter has a conductive shield plate disposed on the circuit board via a conductive spacer so as to cover the circuit board,
The surge recovery structure according to claim 2, wherein the resistor includes the conductive spacer and the conductive shield plate. The inverter has a ground pattern formed on the circuit board,
The surge recovery structure according to claim 2, wherein the resistor includes the ground pattern. A shielded cable including a shielded wire electrically connects the inverter and the load,
The surge recovery structure according to claim 2, wherein the resistor includes the shield wire. The resistor includes one resistor and another resistor,
The surge recovery structure according to claim 1, wherein the one resistor and the other resistor are electrically connected in parallel. A case-to-wiring capacitor interposed between the case and the wiring and electrically connecting the case and the wiring,
The casing is
a nonmetallic part formed from the nonmetallic material;
A metal part formed from a metal material,
the resistor is electrically connected between the load and the metal part,
2. The surge recovery structure according to claim 1, wherein the capacitance between the casing and the wiring includes a capacitance between the metal part and the wiring. The capacitance between the casing and the wiring includes the capacitance between the non-metallic part and the wiring,
including a grounding wire that electrically connects the load and the casing;
The resistor is configured such that the first impedance is a third impedance of a path from the load to the load via the ground wire, the casing, the reference potential of the casing, the capacitance between the nonmetallic part and the wiring, and the inverter. The surge recovery structure according to claim 8, wherein the surge recovery structure is set to be lower than the impedance. having a metal casing that houses the inverter;
The surge recovery structure according to claim 1, wherein the metal casing is housed within the casing. An electrical aircraft equipment mounted on an aircraft and comprising the surge recovery structure according to any one of claims 1 to 10,
the housing has an aircraft reinforcement structure;
An electrical equipment for an aircraft, wherein the resistor includes the reinforcing structure. The electrical equipment for an aircraft according to claim 11, wherein the housing is electrically connected to a reference potential formed by either the earth or the thundercloud via a resistor. An electrical equipment for wind power generation, which is mounted on a wind power generation device and includes the surge recovery structure according to any one of claims 1 to 10,
The housing includes a nacelle housing a wind power generator,
An electrical equipment for wind power generation, in which the resistor includes the nacelle. The wind power generation device is installed on the ground,
14. The electrical equipment for wind power generation according to claim 13, wherein the housing is electrically connected to a reference potential of the earth through a ground wiring that electrically connects the earth and the nacelle.

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