CN104868436A - Connecting protection system for seabed observational network - Google Patents
Connecting protection system for seabed observational network Download PDFInfo
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- CN104868436A CN104868436A CN201510261758.5A CN201510261758A CN104868436A CN 104868436 A CN104868436 A CN 104868436A CN 201510261758 A CN201510261758 A CN 201510261758A CN 104868436 A CN104868436 A CN 104868436A
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Abstract
The invention discloses a connecting protection system for a seabed observational network. The connecting protection system mainly comprises a connecting protection circuit, a grounding detection circuit and a controller, and diagnoses and protects against five faults of overvoltage, under-voltage, short circuit, over-current and earth fault. The connecting protection circuit samples the supply voltage and supply current of a DC power supply, and detects and diagnoses four faults of overvoltage, under-voltage, short circuit and over-current on a real-time basis. A semiconductor switch tube is employed to control connection of a lower-level seabed observation apparatus. The grounding detection circuit employs an active control and detection means, and the controller controls and detects the resistance of grounding resistors of anode and cathode power transmission cables of the seabed observation apparatus to the seawater floor. When the resistance of the grounding resistors is lower than a preset threshold, the controller gives off a disconnection instruction to cut off the power supply of the seabed observation apparatus. The connecting protection system employs a bi-layer protection mechanism, is high in reliability and provides effective protection for a seabed observational network.
Description
Technical field
The invention belongs to deep seafloor observational network observation technology field, be specifically related to a kind of submarine observation network and plug into protection system.
Background technology
Seabed observation network is a kind of observation system electric energy in terrestrial base station being transported to submarine observation node by sea floor optoelectronic composite cable with high voltage direct current form, can realize the long-term, real-time of environments such as subsea and multidisciplinary synthesis observation, be the Important Platform that the mankind explore ocean.Due to the diversity of submarine observation instrument and equipment, required supply power voltage, power are all had nothing in common with each other, therefore the electric energy being transported to seabed can not be powered directly to submarine observation instrument and equipment, needs to carry out corresponding electric energy conversion, and the electric energy after conversion powers to multiple submarine observation instrument and equipment simultaneously.
Summary of the invention
The object of this invention is to provide a kind of submarine observation network to plug into protection system; to realize in case of a failure; cut off the output port broken down timely and effectively; realize the electrical isolation with fault submarine observation instrument and equipment; stop the expansion of fault, do not have influence on the normal work of other underwater instrument equipment.
Submarine observation network of the present invention is plugged into protection system, comprises controller C, driver Q, sampling resistor R1, sampling resistor R2, sampling resistor R3, sampling resistor R4, semiconductor switch pipe S, solid-state relay S1, solid-state relay S2, middle frequency comparison apparatus C1, middle frequency comparison apparatus C2, middle frequency comparison apparatus C3, high frequency comparator C4, diode D1, diode D2, diode D3, diode D4;
One end of sampling resistor R1 is all connected with the anode of power supply with the drain electrode of semiconductor switch pipe S, the other end of sampling resistor R1 and one end of sampling resistor R2 connect altogether and are connected with the sampling input of middle frequency comparison apparatus C1 and the sampling input of middle frequency comparison apparatus C2 as voltage sample end, the other end of sampling resistor R2, one end of sampling resistor R3 is all connected with the negative terminal of power supply with sampled signal ground AGND, the other end of sampling resistor R3 is as the sampling input of current sample end and middle frequency comparison apparatus C3, the sampling input of high frequency comparator C4 connects and connects the power supply negative terminal of offshore instrument equipment and the output of solid-state relay S2 simultaneously, the output of middle frequency comparison apparatus C1 is connected with an I/O port of the positive pole of diode D1 and controller C, the output of middle frequency comparison apparatus C2 is connected with second I/O port of the positive pole of diode D2 and controller C, the output of middle frequency comparison apparatus C3 is connected with the 3rd the I/O port of the positive pole of diode D3 and controller C, the output of high frequency comparator C4 is connected with the 4th the I/O port of the positive pole of diode D4 and controller C, the negative pole of diode D1, the negative pole of diode D2, the negative pole of diode D3, the negative pole of diode D4 is all connected with the protection interruptive port of driver Q, 5th the I/O port of controller C is connected with the enable port of driver Q, 6th the I/O port of controller C is connected with the Enable Pin of solid-state relay S1, 7th the I/O port of controller C is connected with the Enable Pin of solid-state relay S2, the driving port of driver Q is connected with the grid of semiconductor switch pipe S, the source electrode of semiconductor switch pipe S, the input of solid-state relay S1 is all connected with the power supply anode of offshore instrument equipment, the output of solid-state relay S1, the input of solid-state relay S2, one end of sampling resistor R4 is all connected with the 8th the I/O port of controller C, the other end of sampling resistor R4 is connected with seawater ground SGND and sampled signal ground AGND, described power supply is 375V or 48V DC power supply.
In technique scheme, described semiconductor switch pipe S is switch mosfet pipe or IGBT switching tube, and corresponding driver Q is switch mosfet pipe driving chip or IGBT switching tube driving chip.
For protection system of plugging into, the most important thing is the drive and protection circuit part realizing switching device.Because the short trouble that rear end submarine observation instrument and equipment causes, over current fault can bring very large infringement to front end power supply and switching device, the transient high-current that short trouble causes can burn switch element in very short time (1ms), and over current fault can make the switch element temperature of conducting sharply raise, serious threat switch element, threatens the safety of other modules of system simultaneously.The overvoltage fault that front end power supply causes and under-voltage fault then can cause damage to rear end submarine observation instrument and equipment, the instantaneous high pressure that overvoltage fault produces can burn rear end submarine observation instrument and equipment instantaneously, the low pressure that under-voltage fault produces can make submarine observation instrument and equipment be operated in an abnormal operating state, and the operating efficiency affecting equipment even produces the damage of unrepairable to the sampling precision of some high-precision underwater sensors.Earth fault be positive and negative end power transmission cable to seawater the earth resistance of (SGND) decline gradually or with seawater (SGND) directly contact, produce earth current, the existence of earth current can accelerate the electrochemical corrosion of power transmission cable, accelerate power transmission cable to seawater (SGND) impedance ground reduce, finally cause the generation of short trouble.Earth fault is a process slowly occurred; protection is realized at controller software layer after can being sampled by electricity; but above-mentioned front four kinds of faults all need very high response speed; the way realizing protecting at controller software layer after being sampled by electricity is limited by the scan period (being generally more than 10ms) of controller, cannot reach the demand of high-speed response.Therefore, defencive function that is real-time, high response speed must be realized in hardware circuit.
By sampling resistor R1, R2, R3 in protection system of the present invention; middle frequency comparison apparatus C1, C2, C3; high frequency comparator C4, diode D1, D2, D3, D4; driver Q and semiconductor switch pipe S forms protective circuit of plugging into, and forms grounded inspection circuit by solid-state relay S1, S2 and sampling resistor R4.Protective circuit of plugging into is as the core circuit portions of this system, and protective circuit of plugging into enters end and connects 375V or 48V DC power supply, goes out end and connects offshore instrument equipment.Protective circuit of plugging in the present invention adopts plug into power supply control and the electrical isolation of semiconductor switch pipe realizing circuit.Protective circuit of plugging into is by sampling to the supply power voltage of 375V or 48V power supply and supply current; and the diagnosis of overvoltage, under-voltage, short circuit, overcurrent four faults is realized according to demand based on the comparator of different frequency; when there are failures; export corresponding fault-signal to controller; utilize four diodes to form an OR-gate simultaneously; any one fault-signal, all by the fault protection of trig driver.Grounded inspection circuit enters end and connects 375V or 48V DC power supply unit, (SGND with going out end and seawater, i.e. seawater or device housings) connect, adopt the principle of electric resistance partial pressure sampling, controller ACTIVE CONTROL detects positive and negative electrode power transmission cable to the earth resistance of seawater, and sampled result is passed to controller as earth fault judgment basis.
Beneficial effect of the present invention is: between power supply and submarine observation instrument and equipment, design a protection system of plugging into, on the one hand when the supply power voltage generation concuss change of front end power supply, this protection system of plugging into can realize electrical isolation between power supply and submarine observation instrument and equipment, prevents this false voltage to the infringement of rear end submarine observation instrument and equipment; On the other hand; when rear end connect extra large cable insulating properties decline or certain submarine observation instrument and equipment break down; this protection system of plugging into can be cut off timely and effectively and isolate this road and to power output port; prevent the expansion of fault, do not affect the normal work of front end power supply and other observation instrument equipment simultaneously.The present invention adopts double shielding mechanism, and reliability is high, can provide protection of effectively plugging into for submarine observation network system.
Accompanying drawing explanation
Fig. 1 is that submarine observation network is plugged into the system architecture diagram of protection system.
In figure: C is controller; D1, D2, D3, D4 are four diodes; C1, C2, C3 are three middle frequency comparison apparatus, C4 is high frequency comparator; Q is driver; S is semiconductor switch pipe; S1, S2 are two solid-state relays; R1, R2, R3, R4 are four sampling resistors.
Embodiment
The present invention is further illustrated below in conjunction with Figure of description.
With reference to Fig. 1, submarine observation network of the present invention is plugged into protection system, comprises controller C, driver Q, sampling resistor R1, sampling resistor R2, sampling resistor R3, sampling resistor R4, semiconductor switch pipe S, solid-state relay S1, solid-state relay S2, middle frequency comparison apparatus C1, middle frequency comparison apparatus C2, middle frequency comparison apparatus C3, high frequency comparator C4, diode D1, diode D2, diode D3, diode D4;
One end of sampling resistor R1 is all connected with the anode of power supply with the drain electrode of semiconductor switch pipe S, the other end of sampling resistor R1 and one end of sampling resistor R2 connect altogether and are connected with the sampling input of middle frequency comparison apparatus C1 and the sampling input of middle frequency comparison apparatus C2 as voltage sample end, the other end of sampling resistor R2, one end of sampling resistor R3 is all connected with the negative terminal of power supply with sampled signal ground AGND, the other end of sampling resistor R3 is as the sampling input of current sample end and middle frequency comparison apparatus C3, the sampling input of high frequency comparator C4 connects and connects the power supply negative terminal of offshore instrument equipment and the output of solid-state relay S2 simultaneously, the output of middle frequency comparison apparatus C1 is connected with an I/O port of the positive pole of diode D1 and controller C, the output of middle frequency comparison apparatus C2 is connected with second I/O port of the positive pole of diode D2 and controller C, the output of middle frequency comparison apparatus C3 is connected with the 3rd the I/O port of the positive pole of diode D3 and controller C, the output of high frequency comparator C4 is connected with the 4th the I/O port of the positive pole of diode D4 and controller C, the negative pole of diode D1, the negative pole of diode D2, the negative pole of diode D3, the negative pole of diode D4 is all connected with the protection interruptive port of driver Q, 5th the I/O port of controller C is connected with the enable port of driver Q, 6th the I/O port of controller C is connected with the Enable Pin of solid-state relay S1, 7th the I/O port of controller C is connected with the Enable Pin of solid-state relay S2, the driving port of driver Q is connected with the grid of semiconductor switch pipe S, the source electrode of semiconductor switch pipe S, the input of solid-state relay S1 is all connected with the power supply anode of offshore instrument equipment, the output of solid-state relay S1, the input of solid-state relay S2, one end of sampling resistor R4 is all connected with the 8th the I/O port of controller C, the other end of sampling resistor R4 is connected with seawater ground SGND and sampled signal ground AGND, described power supply is 375V or 48V DC power supply.
In technique scheme, described semiconductor switch pipe S is switch mosfet pipe or IGBT switching tube, and corresponding driver Q is switch mosfet pipe driving chip or IGBT switching tube driving chip.
When protection system of plugging into of the present invention normally works, controller C sends to the driver Q of protective circuit of plugging into power supply instruction of plugging into, and the driver Q of protective circuit of plugging into sends closed drive singal, controls semiconductor switch pipe S and closes.After semiconductor switch pipe S completes closed action, 375V or 48V power supply starts as submarine observation instrument and equipment is powered.
Protective circuit of plugging into completes overvoltage, under-voltage, short circuit, the diagnosis of overcurrent four kinds of faults and defencive function at hardware layer.Protective circuit of plugging into utilizes the electric resistance partial pressure principle of sampling resistor R1, R2, the supply power voltage of 375V/48V power supply is constantly sampled, sampled voltage is input to the sampling input of middle frequency comparison apparatus C1 and middle frequency comparison apparatus C2 respectively, and compared with the voltage threshold preset with two middle frequency comparison apparatus, during the voltage threshold preset when the voltage threshold that sampled voltage is preset higher than middle frequency comparison apparatus C1 and lower than middle frequency comparison apparatus C2, two intermediate frequency comparator output terminal output low levels, now show fault-free, fault-free signal exports; The voltage threshold that sampled voltage is preset lower than middle frequency comparison apparatus C1 or preset higher than middle frequency comparison apparatus C2 voltage threshold time, corresponding intermediate frequency comparator output terminal exports high level, provides under-voltage signal or overvoltage signal.
Protective circuit of simultaneously plugging into obtains the sample rate current of 375V/48V power supply by sampling to the voltage at sampling resistor R3 two ends, sample rate current is input to the sampling input of middle frequency comparison apparatus C3 and high frequency comparator C4 respectively, and compared with the current threshold set in advance with two comparators, when sample rate current is less than current threshold that high frequency comparator C4 presets and the current threshold that middle frequency comparison apparatus C3 presets, two comparator output terminals export high level, now represent fault-free signal, fault-free signal exports; When sample rate current is greater than current threshold that high frequency comparator C4 presets or the current threshold that middle frequency comparison apparatus C3 presets, corresponding comparator output terminal exports high level, provides short-circuit signal or over-current signal.
Different as requested, the protection of four kinds of faults requires different for false voltage with the response speed of fault current, and short-circuit protection response speed requires high, and adopt high frequency comparator C4, compare cycle is microsecond rank; The response speed of under-voltage protection, overvoltage protection and overcurrent protection requires lower; frequency comparison apparatus C1-C3 in employing; compare cycle is millisecond rank; four kinds of fault-signals send the I/O port of controller C on the one hand respectively to; after controller C receives fault-signal, corresponding fault-signal is latched, and at software layer, reset and locked is carried out to instruction of plugging into.On the other hand; diode D1, D2, D3, D4 form an OR-gate; the high level fault signal of any one fault all can trigger a guard signal and be transported to the protection interruptive port of driver Q; driver Q interrupts sending drive singal to semiconductor switch pipe S, controls semiconductor switch pipe S and disconnects.Now 375V/48V power supply stops powering for offshore instrument equipment, realizes electrical isolation therebetween.
The diagnosis of earth fault completes at software layer with protection.Controller C timing sends the instruction of positive and negative the two poles of the earth insulating resistance measuring to grounded inspection circuit, grounded inspection circuit utilizes electric resistance partial pressure sampling principle to detect the positive and negative the two poles of the earth of power transmission cable to the earth resistance of seawater (SGND).When controller C sends plus earth resistance detection instruction to grounded inspection circuit, control the closed of solid-state relay S2, the I/O port of controller C is returned in the ground connection sampled signal transmission detected at sampling resistor R4 two ends, the ground connection sampled signal received carries out calculating the earth resistance resistance of positive pole power transmission cable to seawater SGND by controller C, the earth resistance threshold value of the plus earth resistance calculated and setting is compared, when the plus earth resistance recorded is less than the earth resistance threshold value of setting, the earth-fault signal alarm of trigger controller C, this fault-signal is latched, reset and locked is carried out to instruction of plugging into.The insulating resistance measuring principle of negative pole power transmission cable to seawater ground SGND is similar to the above.
When there is fault latch signal, controller C power supply instruction authority of plugging into is locked, cannot send instruction of plugging into protective circuit of plugging into.After troubleshooting, controller C receives artificial host computer reset instruction, removes fault latch signal, regains the authority sending instruction of plugging into protective circuit of plugging into.
Claims (4)
1. a submarine observation network is plugged into protection system, it is characterized in that, comprise controller C, driver Q, sampling resistor R1, sampling resistor R2, sampling resistor R3, sampling resistor R4, semiconductor switch pipe S, solid-state relay S1, solid-state relay S2, middle frequency comparison apparatus C1, middle frequency comparison apparatus C2, middle frequency comparison apparatus C3, high frequency comparator C4, diode D1, diode D2, diode D3, diode D4;
One end of sampling resistor R1 is all connected with the anode of power supply with the drain electrode of semiconductor switch pipe S, the other end of sampling resistor R1 and one end of sampling resistor R2 connect altogether and are connected with the sampling input of middle frequency comparison apparatus C1 and the sampling input of middle frequency comparison apparatus C2 as voltage sample end, the other end of sampling resistor R2, one end of sampling resistor R3 is all connected with the negative terminal of power supply with sampled signal ground AGND, the other end of sampling resistor R3 is as the sampling input of current sample end and middle frequency comparison apparatus C3, the sampling input of high frequency comparator C4 connects and connects the power supply negative terminal of offshore instrument equipment and the output of solid-state relay S2 simultaneously, the output of middle frequency comparison apparatus C1 is connected with an I/O port of the positive pole of diode D1 and controller C, the output of middle frequency comparison apparatus C2 is connected with second I/O port of the positive pole of diode D2 and controller C, the output of middle frequency comparison apparatus C3 is connected with the 3rd the I/O port of the positive pole of diode D3 and controller C, the output of high frequency comparator C4 is connected with the 4th the I/O port of the positive pole of diode D4 and controller C, the negative pole of diode D1, the negative pole of diode D2, the negative pole of diode D3, the negative pole of diode D4 is all connected with the protection interruptive port of driver Q, 5th the I/O port of controller C is connected with the enable port of driver Q, 6th the I/O port of controller C is connected with the Enable Pin of solid-state relay S1, 7th the I/O port of controller C is connected with the Enable Pin of solid-state relay S2, the driving port of driver Q is connected with the grid of semiconductor switch pipe S, the source electrode of semiconductor switch pipe S, the input of solid-state relay S1 is all connected with the power supply anode of offshore instrument equipment, the output of solid-state relay S1, the input of solid-state relay S2, one end of sampling resistor R4 is all connected with the 8th the I/O port of controller C, the other end of sampling resistor R4 is connected with seawater ground SGND and sampled signal ground AGND, described power supply is 375V or 48V DC power supply.
2. submarine observation network according to claim 1 is plugged into protection system, and it is characterized in that, described semiconductor switch pipe S is switch mosfet pipe, and described driver Q is switch mosfet pipe driving chip.
3. submarine observation network according to claim 1 is plugged into protection system, and it is characterized in that, described semiconductor switch pipe S is IGBT switching tube, and described driver Q is IGBT switching tube driving chip.
4. submarine observation network according to claim 1 is plugged into protection system, it is characterized in that, described controller C has the control chip that at least 8 I/O drive ports.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510261758.5A CN104868436A (en) | 2015-05-21 | 2015-05-21 | Connecting protection system for seabed observational network |
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| CN201510261758.5A CN104868436A (en) | 2015-05-21 | 2015-05-21 | Connecting protection system for seabed observational network |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106816863A (en) * | 2017-03-14 | 2017-06-09 | 浙江大学 | A kind of urgent ground protection circuit of bank base power supply for submarine observation network |
| CN109524952A (en) * | 2018-12-13 | 2019-03-26 | 中国船舶工业系统工程研究院 | A kind of box 375V DC power supply monitoring device of plugging under water |
| CN109698826A (en) * | 2018-12-06 | 2019-04-30 | 贵州电网有限责任公司 | In a kind of electrical power services device between exchange system port security isolation implementation method |
| CN109842091A (en) * | 2019-03-25 | 2019-06-04 | 广东美的制冷设备有限公司 | Drive control circuit and household appliance |
| CN110752580A (en) * | 2018-07-23 | 2020-02-04 | 中国科学院沈阳自动化研究所 | Connection box power supply system and method for submarine observation network |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106816863A (en) * | 2017-03-14 | 2017-06-09 | 浙江大学 | A kind of urgent ground protection circuit of bank base power supply for submarine observation network |
| CN106816863B (en) * | 2017-03-14 | 2019-01-22 | 浙江大学 | A kind of urgent ground protection circuit of bank base power supply for submarine observation network |
| CN110752580A (en) * | 2018-07-23 | 2020-02-04 | 中国科学院沈阳自动化研究所 | Connection box power supply system and method for submarine observation network |
| CN109698826A (en) * | 2018-12-06 | 2019-04-30 | 贵州电网有限责任公司 | In a kind of electrical power services device between exchange system port security isolation implementation method |
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| CN109524952A (en) * | 2018-12-13 | 2019-03-26 | 中国船舶工业系统工程研究院 | A kind of box 375V DC power supply monitoring device of plugging under water |
| CN109842091A (en) * | 2019-03-25 | 2019-06-04 | 广东美的制冷设备有限公司 | Drive control circuit and household appliance |
| CN109842091B (en) * | 2019-03-25 | 2020-06-05 | 广东美的制冷设备有限公司 | Drive control circuit and household electrical appliance |
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