CN204028345U - A kind of system that detects voltage transformer (VT) and resist earth potential climbing capacity - Google Patents
A kind of system that detects voltage transformer (VT) and resist earth potential climbing capacity Download PDFInfo
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- CN204028345U CN204028345U CN201420463993.1U CN201420463993U CN204028345U CN 204028345 U CN204028345 U CN 204028345U CN 201420463993 U CN201420463993 U CN 201420463993U CN 204028345 U CN204028345 U CN 204028345U
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Abstract
The utility model provides a kind of system that detects voltage transformer (VT) and resist earth potential climbing capacity, and described system comprises lightning wave impulse generator, controllable impedance L, adjustable resistor R, measurement mechanism; Described lightning wave impulse generator is provided with the output terminal being connected with the input end of electronic type voltage transformer to be detected, described measurement mechanism is provided with respectively two input ends with the output and ground sub-connection of described electronic type voltage transformer to be detected, described controllable impedance L comprises two terminals that are connected with one end of described adjustable resistor R with the ground terminal of described electronic type voltage transformer to be detected respectively, and the other end of described adjustable resistor R is connected with grounded screen.This system features in convenient, has overcome the emulation mode shortcoming of simulating actual conditions completely, and in function, cost is lower with building the method equivalence of GIS test platform, can before hanging net operation examination, carry out quality to product and check on.
Description
Technical field:
The utility model relates to a kind of detection system, specifically relates to a kind of detected electrons formula voltage transformer (VT) and resist the system of transient state earth potential rising invasive ability.
Background technology:
As the electric power mutual-inductor of the important converting equipment of a class, its enormous amount and widely distributed, is mainly used in providing metrical information for electrical secondary systems such as metering, control and relay protections.
Electronic mutual inductor in electric power mutual-inductor have insulation system simple, without magnetic saturation, the advantage such as measuring accuracy is high, transient response scope is large, volume is little, output signal digitizing; it not only can reduce the integrated cost of transformer station; the more important thing is Reliability of Microprocessor and the precision that can significantly improve the interior protective device of system and measuring apparatus, therefore in electrical network, widely applied in recent years.
The overwhelming majority in the electronic type voltage transformer (Electronic Voltage Transformer, EVT) having put into operation is at present the capacitive voltage division electronic voltage transformer based on capacitive divider principle.According to the difference of use occasion, capacitance partial pressure type EVT can be divided into again the deposited large class of formula two in independent support type and GIS (Gas Insulated Substation).In GIS, apply formula EVT for GIS transformer station, generally adopt gas-insulated, mainly formed by capacitive divider, cylindrical shell, disc insulator, signal picker and merge cells etc.Carry out the switchgear operation such as disconnector, isolating switch during as GIS, very easily produce oscillation frequency up to dozens or even hundreds of million very fast transient overvoltage (Very Fast Transient Overvoltage, VFTO), thereby often cause transient state earth potential rising (the Transient Grounding Potential Rise in GIS transformer station, TGPR) phenomenon, causes heavy losses.TGPR can exert an influence to applying formula EVT in GIS, threatens its insulation, disturbs and even damages signal picker and power supply thereof.Therefore, in GIS, apply in the design process of formula EVT product, need to study the impact of TGPR.
Adopt at present following three kinds of method research TGPR on applying the impact of formula EVT product in GIS
(1) simulation study.Utilize the power system simulation softwares such as EMTP, EMTDC/PSCAD, NETOMAC to set up the model of GIS and EVT, obtain voltage, the current parameters on EVT element by simulation calculation.Although this method is simple and easy to do, exist institute's established model deficiency of simulating actual conditions completely, and simulation study cannot substitute products test, therefore need to provide the test method of applying formula EVT in a kind of GIS of detection and resist TGPR ability;
(2) hanging net operation of EVT product examination.Although this method can make EVT operate in actual electric network, in view of the strict demand of operation of power networks to safe reliability, may make linked network EVT not experience the harshest service condition at all, also just cannot verify the correctness of product design comprehensively.In addition, this method cannot play and before product export, carry out the effect that quality is checked on;
(3) build and comprise isolating switch, disconnector at interior GIS test platform, utilize the operation of switchgear to produce TGPR, examine applying formula EVT product in GIS, this method meets the demand that detects EVT product and resist TGPR ability technically.But the practical experience of operation of power networks shows, the very fast transient overvoltage that causes TGPR is present among electrical network more than 420kV, this just means if simulate the TGPR consistent with operation of power networks situation completely, the electric pressure of GIS test platform is inevitable higher than 420kV, involves great expense and the manufacture level of platform device is had relatively high expectations.
Based on above-mentioned background, the technical scheme that a kind of good economy performance need to be provided, avoid building GIS test platform and be convenient to realize is carried out detected electrons formula voltage transformer (VT) and is resisted transient state earth potential climbing capacity.
Utility model content:
In order to overcome existing above-mentioned defect in prior art, the utility model provides a kind of system that detects voltage transformer (VT) and resist earth potential climbing capacity.
The technical scheme that the utility model provides is: a kind of system that detects voltage transformer (VT) and resist earth potential climbing capacity, and described system comprises lightning wave impulse generator, controllable impedance L, adjustable resistor R, measurement mechanism; Its improvements are: described lightning wave impulse generator is provided with the output terminal being connected with the input end of electronic type voltage transformer to be detected, described measurement mechanism is provided with respectively two input ends with the output and ground sub-connection of described electronic type voltage transformer to be detected, described controllable impedance L comprises two terminals that are connected with one end of described adjustable resistor R with the ground terminal of described electronic type voltage transformer to be detected respectively, and the other end of described adjustable resistor R is connected with grounded screen.
Preferably, the input end of described lightning wave impulse generator is connected with industrial frequency experiment power supply.
Preferably, described measurement mechanism comprises wave tracer and high-voltage probe, and the output terminal of described high-voltage probe is connected with the input end of described wave tracer.
Further, described high-voltage probe comprises the second high-voltage probe that the first high-voltage probe that input end is connected with electronic type voltage transformer output terminal to be detected is connected with described electronic type voltage transformer ground terminal to be detected with input end.
Further, another input end of described the first high-voltage probe and another input end of described the second high-voltage probe are connected with grounded screen respectively.
Compared with immediate technical scheme, the utlity model has following marked improvement:
1, the electronic type voltage transformer that the utility model provides is resisted earth potential climbing capacity detection system, has overcome the emulation mode shortcoming of simulating actual conditions completely, can before hanging net operation examination, carry out quality to product and check on.
2, the utility model adopts lightning wave impulse generator to produce and the very fast transient overvoltage of GIS inside similar superpotential on the waveform character such as rise time and amplitude, comprising isolating switch, disconnector with structure carries out at interior GIS test platform compared with the method for correlation test, the utility model has been saved cost of investment, test period is short, workable.
3, the testing result that measurement mechanism records can be used as the reference frame of applying formula EVT product design in GIS, perfect mentality of designing and the step of electronic type voltage transformer.
Brief description of the drawings:
Fig. 1 is the test connection figure of original employing GIS test platform;
Fig. 2 is the installation dimension figure of original employing GIS test platform;
The test principle figure that Fig. 3 provides for utility model;
Fig. 4 is the circuit theory diagrams of 4 grades of impulse voltage generators.
Embodiment:
In order to understand better the utility model, below in conjunction with Figure of description and example, content of the present utility model is described further.
Fig. 1 and Fig. 2 are test connection figure and the installation dimension figure of the GIS test platform of examination electronic mutual inductor, and this test platform cost is high, manufacture difficulty is large.
The schematic diagram of the technical scheme that the utility model provides is as shown in Figure 3: detection system is made up of lightning wave impulse generator, controllable impedance, adjustable resistor and measurement mechanism.
Lightning wave impulse generator adopts multistage impulse voltage generator stack composition, its input side joint industrial frequency experiment power supply, the input of outgoing side reception detected electrons formula voltage transformer (VT), for generation of 500kV and very fast transient overvoltage above and GIS inside similar input voltage on the waveform character such as rise time and amplitude.
Fig. 4 is the elementary diagram of 4 grades of impulse voltage generators, wherein: T is power supply high voltage transformer; D is rectification high voltage silicon rectifier stack; R is protective resistance; R is charging resistor; C is the main capacitance of every grade; C
sfor the stray capacitance over the ground of every grade of respective point; g
1for ignition pill gap; g
2～g
4for intermediate gap; g
0for batching sphere gap; r
ffor the wavefront resistance of every grade; r
tfor the discharge resistance of every grade; C
tfor load capacity.According to test demand difference, thereby above-mentioned 4 grades of impulse voltage generators can be generalized to 4 grades of above surge voltages that produce different amplitudes.
The outgoing side of electronic type voltage transformer input side joint lightning wave impulse generator to be detected, the input side of its outgoing side access measurement mechanism.
Controllable impedance is for simulating the lead-in inductance between ground terminal and the grounding net of transformer substation of electronic type voltage transformer to be detected, its one end is connected with the ground terminal of electronic type voltage transformer to be detected and output signal is reached to the input side of measurement mechanism, and the other end is connected with adjustable resistor.
Adjustable resistor is by the stake resistance of the each electric pressure of the change modeling transformer station of resistance, and its one end is connected with controllable impedance, and the other end is connected with grounded screen.
Measurement mechanism receives the output signal of electronic type voltage transformer to be detected, this output signal has reflected the output situation of the electronic type voltage transformer to be detected in the time that transient state earth potential raises generation, can be used for detecting design parameter and the insulation margin of assessment electronic type voltage transformer.
Measurement mechanism receives the output signal of controllable impedance and electronic type voltage transformer ground terminal to be detected connection, this output signal has reflected the current potential size of the electronic type voltage transformer ground terminal to be detected in the time that transient state earth potential raises generation, can be used as the reference frame of electronic type voltage transformer product design.
Measurement mechanism is mainly made up of high-voltage probe and wave tracer two parts, for the overvoltage signal that prevents from measuring is by the parts damages in measurement mechanism, the voltage tolerance parameter of high-voltage probe is higher than the maximum possible value of electronic type voltage transformer lead-out terminal to be detected and ground terminal two point voltages.The Measurement bandwidth of high-voltage probe is greater than the bandwidth of electronic type voltage transformer lead-out terminal to be detected and ground terminal two point voltages.
The function of high-voltage probe is that the output signal of electronic type voltage transformer to be detected and the output signal of controllable impedance and electronic type voltage transformer ground terminal to be detected connection that are input to measurement mechanism are dwindled by a certain percentage to decay, made its size within the input range scope of wave tracer; Waveform recording device part is mainly used in showing, stores, analyzes input signal wherein.
Detecting when test, first, regulate lightning wave impulse generator, it is simulated and the very fast transient overvoltage of GIS inside similar superpotential on the waveform character such as rise time and amplitude, as the input voltage of electronic type voltage transformer to be detected;
Obtain after input voltage at electronic type voltage transformer to be detected, measurement mechanism records the output signal of electronic type voltage transformer to be detected and the output signal of controllable impedance and electronic type voltage transformer ground terminal to be detected connection.According to actual needs, measurement mechanism can carry out waveform demonstration, storage and analysis to this two-way output signal.
These are only embodiment of the present utility model, be not limited to the utility model, all within spirit of the present utility model and principle, any amendment of making, be equal to replacement, improvement etc., within the claim scope of the present utility model all awaiting the reply in application.
Claims (5)
1. detect voltage transformer (VT) and resist a system for earth potential climbing capacity, described system comprises lightning wave impulse generator, controllable impedance L, adjustable resistor R, measurement mechanism;
It is characterized in that: described lightning wave impulse generator is provided with the output terminal being connected with the input end of electronic type voltage transformer to be detected, described measurement mechanism is provided with respectively two input ends with the output and ground sub-connection of described electronic type voltage transformer to be detected, described controllable impedance L comprises two terminals that are connected with one end of described adjustable resistor R with the ground terminal of described electronic type voltage transformer to be detected respectively, and the other end of described adjustable resistor R is connected with grounded screen.
2. a kind of system that detects voltage transformer (VT) and resist earth potential climbing capacity as claimed in claim 1, is characterized in that:
The input end of described lightning wave impulse generator is connected with industrial frequency experiment power supply.
3. a kind of system that detects voltage transformer (VT) and resist earth potential climbing capacity as claimed in claim 1, is characterized in that:
Described measurement mechanism comprises wave tracer and high-voltage probe, and the output terminal of described high-voltage probe is connected with the input end of described wave tracer.
4. a kind of system that detects voltage transformer (VT) and resist earth potential climbing capacity as claimed in claim 3, is characterized in that:
Described high-voltage probe comprises the second high-voltage probe that the first high-voltage probe that input end is connected with electronic type voltage transformer output terminal to be detected is connected with described electronic type voltage transformer ground terminal to be detected with input end.
5. a kind of system that detects voltage transformer (VT) and resist earth potential climbing capacity as claimed in claim 4, is characterized in that:
Another input end of described the first high-voltage probe is connected with grounded screen respectively with another input end of described the second high-voltage probe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420463993.1U CN204028345U (en) | 2014-08-15 | 2014-08-15 | A kind of system that detects voltage transformer (VT) and resist earth potential climbing capacity |
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| CN201420463993.1U CN204028345U (en) | 2014-08-15 | 2014-08-15 | A kind of system that detects voltage transformer (VT) and resist earth potential climbing capacity |
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| CN204028345U true CN204028345U (en) | 2014-12-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019005A (en) * | 2016-05-17 | 2016-10-12 | 中国电力科学研究院 | Testing system and method for simulating increase of transient ground potential |
| CN106772190A (en) * | 2016-11-23 | 2017-05-31 | 国家电网公司 | The test comparison method and device of electronic type voltage transformer under the conditions of a kind of VFTO |
| CN110568234A (en) * | 2019-07-12 | 2019-12-13 | 工业和信息化部威海电子信息技术综合研究中心 | pulse generating device for simulating lightning surge test |
-
2014
- 2014-08-15 CN CN201420463993.1U patent/CN204028345U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019005A (en) * | 2016-05-17 | 2016-10-12 | 中国电力科学研究院 | Testing system and method for simulating increase of transient ground potential |
| CN106019005B (en) * | 2016-05-17 | 2020-07-10 | 中国电力科学研究院 | Test system and method for simulating transient ground potential rise |
| CN106772190A (en) * | 2016-11-23 | 2017-05-31 | 国家电网公司 | The test comparison method and device of electronic type voltage transformer under the conditions of a kind of VFTO |
| CN110568234A (en) * | 2019-07-12 | 2019-12-13 | 工业和信息化部威海电子信息技术综合研究中心 | pulse generating device for simulating lightning surge test |
| CN110568234B (en) * | 2019-07-12 | 2024-05-14 | 工业和信息化部威海电子信息技术综合研究中心 | Pulse generating device for simulating lightning surge test |
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