CN111458611A - Anti-resonance overvoltage GIS voltage withstand test circuit and anti-resonance overvoltage method - Google Patents
Anti-resonance overvoltage GIS voltage withstand test circuit and anti-resonance overvoltage method Download PDFInfo
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- CN111458611A CN111458611A CN202010472490.0A CN202010472490A CN111458611A CN 111458611 A CN111458611 A CN 111458611A CN 202010472490 A CN202010472490 A CN 202010472490A CN 111458611 A CN111458611 A CN 111458611A
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- 238000009413 insulation Methods 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
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Abstract
The invention discloses a resonance overvoltage prevention GIS voltage withstand test circuit and a resonance overvoltage prevention method, which solve the problem of how to endanger equipment and personnel safety by generating resonance overvoltage in a series resonance circuit in a GIS voltage withstand test. The 380V power supply system (1) is connected with the input end of the variable frequency power supply (2), the output end of the variable frequency power supply (2) is connected with the input end of the exciting transformer (3), the high-voltage output end of the exciting transformer (3) is connected with the low-voltage end of the reactor (4), the high-voltage end of the reactor (4) is respectively connected with the high-voltage end of the voltage divider (6) and a wire outlet sleeve of the GIS device (7) through a non-corona wire (5), the output end of the voltage divider is connected with the high-voltage measuring terminal (8), the variable frequency power supply (2) is connected with the variable frequency power supply control box (9) through an optical fiber (10), and the high-voltage tail end of the exciting transformer is respectively connected with the high-. The safety of equipment and personnel is guaranteed.
Description
Technical Field
The invention relates to a GIS voltage withstand test circuit, in particular to a resonance overvoltage prevention GIS voltage withstand test circuit and a resonance overvoltage prevention method.
Background
The GIS equipment is important equipment for the operation of a power grid, and has the advantages of compact structure, small occupied area, long overhaul period, convenience in transportation and the like; the alternating-current voltage withstand test is the most direct and effective method for identifying the insulation strength of the power equipment, can be used for checking the insulation electrical strength level of the GIS equipment, and is an important means for checking and verifying the design, manufacture and installation quality of the GIS equipment; at present, a variable frequency series resonance boosting mode is adopted to carry out alternating current withstand voltage tests on GIS equipment with different voltage grades and different structures, and the method becomes a common method of the current high voltage test; the series resonant circuit has the advantages of improving the output voltage waveform and preventing short-circuit current from burning fault points, so that high voltage is output by a low-voltage small-capacity power supply, and the purpose that the insulation performance of a test article can withstand high voltage is achieved; in an alternating current withstand voltage test of GIS equipment, according to experience, a tester generally cannot make a circuit generate complete resonance, if the circuit is completely resonated, the generated resonance overvoltage easily exceeds the test voltage, and insulation defects such as dust, conductive particle impurities, burrs and the like suspended in the GIS are not burned in time and then are directly broken down by high voltage; in the withstand voltage test process of the GIS equipment, a plurality of uncertain factors (such as temperature, humidity and wind power) can change distributed capacitance, inductance and corona loss equivalent resistance, so that a withstand voltage test circuit can easily reach complete resonance instantly, and the voltage is quickly increased and exceeds the voltage required by the test, so that the GIS equipment is broken down, and the safety of personnel and equipment is seriously threatened.
Disclosure of Invention
The invention provides a resonance overvoltage prevention GIS voltage withstand test circuit and a resonance overvoltage prevention method, and solves the technical problem that how to threaten equipment and personnel safety by generating resonance overvoltage in a series resonance circuit in a GIS voltage withstand test.
The invention solves the technical problems by the following technical scheme:
a GIS withstand voltage test circuit for preventing resonance overvoltage comprises a 380V power supply system, a variable frequency power supply, an excitation transformer, a reactor, a voltage divider, GIS equipment, a high-voltage measurement terminal and a variable frequency power supply control box, wherein the 380V power supply system is connected with the input end of the variable frequency power supply, the variable frequency power supply converts a three-phase power frequency power supply into an output power supply with adjustable frequency and voltage, the output end of the variable frequency power supply is connected with the input end of the excitation transformer, the excitation transformer converts low-voltage input into high-voltage output, the high-voltage output end of the excitation transformer is connected with the low-voltage end of the reactor, the high-voltage end of the reactor is respectively connected with the high-voltage end of the voltage divider and a wire outlet sleeve of the GIS equipment through a non-corona wire, the output end of the voltage divider is connected with the high-voltage measurement terminal, the variable frequency power supply is connected with the variable frequency power supply control box through optical fibers, the high-voltage measurement terminal is connected with the variable frequency power supply control box through another optical fiber to achieve real-time communication, the high-voltage tail end of the exciting transformer is connected with the high-voltage tail end of the voltage divider and the shell of the GIS equipment respectively, and the shell of the GIS equipment is kept grounded through the grounding terminal.
The reactor forms a series resonance circuit with the voltage divider and the GIS equipment, the voltage of the high-voltage end of the reactor is equal to Q times of the output voltage of the exciting transformer, and Q is the quality factor of the test loop.
A method for preventing resonance overvoltage of a GIS (gas insulated switchgear) withstand voltage test circuit is characterized in that the frequency of complete resonance of the GIS withstand voltage test circuit is defined as a resonance frequency f2Defining the frequency of the GIS voltage withstand test circuit which is less than or close to resonance as an under-harmonic frequency f1The method is characterized by comprising the following steps:
starting the variable frequency power supply, and adjusting the frequency of the GIS voltage withstand test circuit to the underharmonic frequency f through the variable frequency power supply control box1To make the resonant frequency f2And the undersonant frequency f1Is greater than or equal toAt 2Hz, i.e. f2- f1The voltage is boosted through a boost button of the variable frequency power supply, and the output voltage value of the variable frequency power supply and the output voltage value of the voltage divider are observed through a control box of the variable frequency power supply; before the boost button of the variable frequency power supply is pressed once, the output voltage value of the voltage divider is U1Indicating that the output voltage value of the voltage divider is U after the boost button of the variable frequency power supply is pressed once2The change of the output voltage value of the voltage divider before and after pressing the boost button of the variable frequency power supply is represented by △ U, namely △ U = U2-U1If △ U is less than or equal to 20 kV, pressing the boost button of the variable frequency power supply again, calculating the change amount of the output voltage value of the voltage divider △ U after the boost button is pressed again, if △ U is less than or equal to 20 kV, pressing the boost button of the variable frequency power supply again, repeating the steps until the output voltage value of the voltage divider reaches the voltage value required by the test loop, and if the change amount of the output voltage value of the voltage divider before and after the boost button of the variable frequency power supply is pressed once meets △ U & gt 20 kV in the boosting process, tripping the variable frequency power supply and cutting off the power supply of the test circuit;
in the boosting process of the test circuit, tracking and calculating the quality factor Q of the resonant circuit in real time according to the voltage value output by the variable frequency power supply, the output voltage value of the voltage divider, the input voltage value and the output voltage value of the exciting transformer, and if the quality factor Q of the resonant circuit is calculated after pressing a boosting button of the variable frequency power supply once2Is the calculated quality factor Q of the resonant circuit before boosting1More than 1.2 times, the frequency conversion power supply is tripped, and the power supply of the test circuit is cut off.
The invention is practical and simple, can conveniently and emergently cut off a test loop aiming at the detuning condition in the series resonance circuit of the GIS voltage-withstanding test, and ensures the safety of equipment and personnel.
Drawings
FIG. 1 is a schematic diagram of a test circuit according to the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a GIS withstand voltage test circuit for preventing resonance overvoltage comprises a 380V power supply system 1, a variable frequency power supply 2, an exciting transformer 3, a reactor 4, a voltage divider 6, GIS equipment 7, a high voltage measuring terminal 8 and a variable frequency power supply control box 9, wherein the 380V power supply system 1 is connected with the input end of the variable frequency power supply 2, the variable frequency power supply 2 converts a three-phase power frequency power supply into an output power supply with adjustable frequency and voltage, the output end of the variable frequency power supply 2 is connected with the input end of the exciting transformer 3, the exciting transformer converts low voltage input into high voltage output, the high voltage output end of the exciting transformer 3 is connected with the low voltage end of the reactor 4, the high voltage end of the reactor 4 is respectively connected with the high voltage end of the voltage divider 6 and a wire outlet sleeve of the GIS equipment 7 through a non-corona wire 5, and the output end, high voltage measurement terminal 8 changes the divider signal of telecommunication into the optical signal input that variable frequency power supply control box 9 needs to variable frequency power supply control box 9 in, variable frequency power supply 2 links together with variable frequency power supply control box 9 through optic fibre 10, high voltage measurement terminal 8 links together with variable frequency power supply control box 9 through another optic fibre, realize real-time communication, the high-pressure tail end of exciting transformer 3 links together with the high-pressure tail end of divider 6 and the shell of GIS equipment 7 respectively, the shell of GIS equipment 7 keeps earthed through ground terminal 11.
The reactor 4, the voltage divider 6 and the GIS device 7) form a series resonant circuit, the voltage of the high-voltage end of the reactor 4 is equal to Q times of the output voltage of the exciting transformer 3, and Q is the quality factor of the test loop.
A method for preventing resonance overvoltage of a GIS (gas insulated switchgear) withstand voltage test circuit is characterized in that the resonance frequency of the GIS withstand voltage test circuit is defined as a resonance frequency f2Defining the frequency of the GIS voltage withstand test circuit which is less than or close to resonance as an under-harmonic frequency f1The method is characterized by comprising the following steps:
the variable frequency power supply 2 is started, and the frequency of the GIS voltage withstand test circuit is adjusted to the underharmonic frequency f through the variable frequency power supply control box 91To make the resonant frequency f2And the undersonant frequency f1Is greater than or equal to 2Hz, i.e. f2- f1Not less than 2Hz, the voltage is boosted through a boost button of the variable frequency power supply 2, and the variable frequency power supply 2 is observed through a variable frequency power supply control box 9The value of the output voltage and the value of the output voltage of the voltage divider 6; before the boost button of the variable frequency power supply 2 is pressed once, the output voltage value of the voltage divider 6 is U1Indicating that the output voltage value of the voltage divider 6 is U after the boost button of the variable frequency power supply 2 is pressed once2The change in the output voltage value of the voltage divider 6 before and after the boost button of the inverter power supply 2 is represented by △ U, i.e., △ U = U2-U1If △ U is less than or equal to 20 kilovolts, pressing a boost button of the variable frequency power supply 2 again, calculating the output voltage value change amount △ U of the voltage divider 6 after the boost button is pressed again, if △ U is less than or equal to 20 kilovolts, pressing the boost button of the variable frequency power supply 2 again, repeating the steps until the output voltage value of the voltage divider 6 reaches the voltage value required by the test loop, and if the output voltage value change amount of the voltage divider 6 before and after the boost button of the variable frequency power supply 2 is pressed once meets △ U which is more than 20 kilovolts in the boosting process, tripping the variable frequency power supply 2 and cutting off the power supply of the test circuit;
the sudden increase of the output voltage value change △ U of the voltage divider 6 is caused by the fact that in the boosting process, external environmental factors (such as temperature, humidity and wind power) change, the equivalent resistance of distributed capacitance, inductance and corona loss in the whole test circuit changes, the circuit can suddenly reach a complete resonance point, the voltage of the voltage divider 6 rapidly increases, and the GIS device 7 is broken down;
in the boosting process of the test circuit, the quality factor Q of the resonant circuit is tracked and calculated in real time according to the voltage value output by the variable frequency power supply 2, the output voltage value of the voltage divider 6 and the input voltage value and the output voltage value of the exciting transformer 3, and if the quality factor Q of the resonant circuit is calculated after the boost button of the variable frequency power supply 2 is pressed once2Is the calculated quality factor Q of the resonant circuit before boosting1More than 1.2 times, the frequency conversion power supply 2 is tripped and cutBreaking the test circuit power supply;
the quality factor Q is related to an inductance value, a capacitance value and a resistance value in the experimental circuit, and under the condition that the inductance value and the capacitance value are basically unchanged, the equivalent resistance in the experimental circuit is a key factor influencing the Q value; the equivalent resistance in the test circuit comprises a reactor direct resistance, an excitation variable equivalent resistance and a corona loss equivalent resistance in a loop, wherein the reactor direct resistance and the excitation variable equivalent resistance are basically unchanged, so the corona loss equivalent resistance has a larger influence on a quality factor Q, but as the voltage rises, the loss in the test loop increases, the corona loss equivalent resistance obviously increases, and the quality factor Q is reduced; if the Q is suddenly increased due to the change of the external environment, GIS equipment can be directly punctured, and the safety of test equipment and personnel is endangered.
Claims (3)
1. A resonance overvoltage prevention GIS withstand voltage test circuit comprises a 380V power supply system (1), a variable frequency power supply (2), an exciting transformer (3), a reactor (4), a voltage divider (6), GIS equipment (7), a high voltage measurement terminal (8) and a variable frequency power supply control box (9), and is characterized in that the 380V power supply system (1) is connected with the input end of the variable frequency power supply (2), the output end of the variable frequency power supply (2) is connected with the input end of the exciting transformer (3), the high voltage output end of the exciting transformer (3) is connected with the low voltage end of the reactor (4), the high voltage end of the reactor (4) is respectively connected with the high voltage end of the voltage divider (6) and a wire outlet sleeve of the GIS equipment (7) through a non-corona wire (5), and the output end of the voltage divider (6) is connected with the high voltage measurement terminal (8), the variable frequency power supply (2) is connected with the variable frequency power supply control box (9) through an optical fiber (10), the high-voltage measurement terminal (8) is connected with the variable frequency power supply control box (9) through another optical fiber, the high-voltage tail end of the excitation transformer (3) is respectively connected with the high-voltage tail end of the voltage divider (6) and the shell of the GIS equipment (7), and the shell of the GIS equipment (7) is kept grounded through the grounding terminal (11).
2. The GIS voltage withstanding test circuit for preventing resonance overvoltage as claimed in claim 1, wherein the reactor (4) forms a series resonance circuit with the voltage divider (6) and the GIS device (7), the voltage at the high-voltage end of the reactor (4) is equal to Q times of the output voltage of the excitation transformer (3), and Q is the quality factor of the test loop.
3. The method for preventing resonance overvoltage of GIS voltage withstanding test circuit according to claim 1, wherein the resonance frequency of the GIS voltage withstanding test circuit is defined as the resonance frequency f2Defining the frequency of the GIS voltage withstand test circuit which is less than or close to resonance as an under-harmonic frequency f1The method is characterized by comprising the following steps:
the variable frequency power supply (2) is started, and the frequency of the GIS voltage withstand test circuit is adjusted to the underharmonic frequency f through the variable frequency power supply control box (9)1To make the resonant frequency f2And the undersonant frequency f1Is greater than or equal to 2Hz, i.e. f2- f1The voltage is boosted through a boost button of the variable frequency power supply (2) and the output voltage value of the voltage divider (6) are observed through a variable frequency power supply control box (9); before the boost button of the variable frequency power supply (2) is pressed once, the output voltage value of the voltage divider (6) is U1The output voltage value of the voltage divider (6) is represented by U after the boost button of the variable frequency power supply (2) is pressed once2The change of the output voltage value of the voltage divider (6) before and after pressing the boosting button of the variable frequency power supply (2) once is represented by △ U, namely △ U = U2-U1If △ U is less than or equal to 20 kV, pressing the boost button of the variable frequency power supply (2) again, calculating the change amount △ U of the output voltage value of the voltage divider (6) after the boost button is pressed again, if △ U is less than or equal to 20 kV, pressing the boost button of the variable frequency power supply (2) again, repeating the steps until the output voltage value of the voltage divider (6) reaches the voltage value required by the test loop, and in the boosting process, if the change amount of the output voltage value of the voltage divider (6) before and after the boost button of the variable frequency power supply (2) is pressed once meets the condition that △ U is more than 20 kV, tripping the variable frequency power supply (2) and cutting off the power supply of the test circuit；
In the boosting process of the test circuit, tracking and calculating the quality factor Q of the resonant circuit in real time according to the voltage value output by the variable frequency power supply (2), the output voltage value of the voltage divider (6) and the input voltage value and the output voltage value of the exciting transformer (3), and if the quality factor Q of the resonant circuit is calculated after pressing a boosting button of the variable frequency power supply (2) once2Is the calculated quality factor Q of the resonant circuit before boosting1More than 1.2 times, the frequency conversion power supply (2) is tripped to cut off the power supply of the test circuit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505508A (en) * | 2020-12-10 | 2021-03-16 | 中国电建集团河南工程有限公司 | GIS frequency conversion resonance voltage withstand test method |
| CN116894373A (en) * | 2023-09-11 | 2023-10-17 | 国网山西省电力公司电力科学研究院 | Method for determining withstand voltage value of dry voltage transformer under frequency division resonance |
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| CN110824346A (en) * | 2019-11-14 | 2020-02-21 | 国网辽宁省电力有限公司电力科学研究院 | Power distribution network circuit breaker series resonance voltage withstand device for power supply of electric automobile |
| CN212255553U (en) * | 2020-05-29 | 2020-12-29 | 国网山西省电力公司电力科学研究院 | Anti-resonance overvoltage GIS voltage withstand test circuit |
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2020
- 2020-05-29 CN CN202010472490.0A patent/CN111458611A/en active Pending
Patent Citations (6)
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| CN200996993Y (en) * | 2007-01-31 | 2007-12-26 | 毕青春 | Frequency-variable serial resonant voltageproof experimental appliance |
| CN206773136U (en) * | 2017-06-01 | 2017-12-19 | 武汉市龙电电气设备有限公司 | A kind of variable-frequency series resonance voltage withstanding |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505508A (en) * | 2020-12-10 | 2021-03-16 | 中国电建集团河南工程有限公司 | GIS frequency conversion resonance voltage withstand test method |
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