CN116500430A - Breaking branch small current breaking test loop and method of high-voltage direct current breaker - Google Patents
Breaking branch small current breaking test loop and method of high-voltage direct current breaker Download PDFInfo
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- CN116500430A CN116500430A CN202310356194.8A CN202310356194A CN116500430A CN 116500430 A CN116500430 A CN 116500430A CN 202310356194 A CN202310356194 A CN 202310356194A CN 116500430 A CN116500430 A CN 116500430A
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses a low-current breaking test loop and a method for breaking a branch of a high-voltage direct-current breaker, wherein the direct-current source loop comprises an alternating-current power supply G, a phase-selecting switching-on breaker BK1, a phase-selecting switching-off breaker BK2, an auxiliary breaker QF, a reactor L and a capacitor C; the reactor L and the capacitor C are connected in parallel to form a resonant circuit, the phase-selecting switching-on breaker BK2 is connected in series in a reactor branch, and the phase-selecting switching-on breaker BK1 is connected with an alternating current power supply G and the input end of the resonant circuit; the auxiliary breaker QF is connected with the output end of the resonant circuit and the input end of the tested direct current breaker; the voltage source loop comprises a pulse main capacitor C S High-voltage ignition ball Gap and high-voltage reactor L S A frequency modulation branch; the arrester energy consumption branch is connected in parallel with the frequency modulation branch; the circuit can realize the examination of the small current breaking capacity of the breaking branch fracture of the combined high-voltage direct-current breaker, and achieves the purpose of equivalence with current and voltage parameters in actual working conditions.
Description
Technical Field
The invention belongs to the technical field of high-voltage direct-current breaker tests, and particularly relates to a circuit and a method for a small-current breaking test of a breaking branch of a high-voltage direct-current breaker.
Background
The multi-terminal flexible high-voltage direct current power transmission network has the characteristics of reliability, economy, flexibility and the like, can realize the transmission and the absorption of large-scale renewable energy sources, and provides powerful technical support for the access of renewable energy sources, the complementation and the flexible absorption of various energy sources and the large-scale energy source grid connection in China. The construction of the north-opening flexible direct current transmission project shows that the multi-terminal flexible direct current transmission in China formally goes from theoretical research to commercial operation, and technical support and practical experience are provided for further optimizing and developing the multi-terminal flexible direct current transmission network in China. Because the technical limitation and the high cost of the direct current breaker suitable for the high-voltage direct current system are high, the development and the construction of the flexible direct current power grid are limited to a certain extent, and the combined high-voltage direct current breaker can be used as a core component for constructing the multi-terminal flexible direct current power transmission power grid in the future, so that the restriction factors in the aspects of technology and cost are solved.
The combined direct current breaker plays roles of load regulation and accident protection in a multi-terminal high-voltage direct current transmission system. In operation, the load circuit needs to be switched according to the actual working condition and the scheduling requirement, which means that the combined direct current breaker needs to have rated current and small current switching-on and switching-off capability.
Referring to the working condition of a small-current breaking test of a high-voltage alternating-current breaker, when the direct-current breaker breaks the small current, electric breakdown is a main difficulty, and thermal breakdown does not dominate, so that the stage with the most severe test assessment is a high-voltage stage. In view of the above, the design and development of the voltage introduction method synthetic test loop with high equivalence can effectively verify the small current breaking capacity of the breaking branch of the combined direct current breaker.
Disclosure of Invention
The invention aims to provide a test loop and a method for a small-current breaking test of a breaking branch of a high-voltage direct-current breaker, and the test loop can realize the examination of the small-current breaking capacity of the breaking branch of the combined high-voltage direct-current breaker, so as to achieve the purpose of being equivalent to current and voltage parameters in actual working conditions.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a high-voltage direct current breaker breaking branch small current breaking test loop comprises a direct current source loop, a voltage source loop and a tested direct current breaker;
the direct current source loop comprises an alternating current power supply G, a phase-selecting on-off breaker BK1, a phase-selecting on-off breaker BK2, an auxiliary breaker QF, a reactor L and a capacitor C; the reactor L and the capacitor C are connected in parallel to form a resonant circuit, the phase-selecting switching-on breaker BK2 is connected in series in a reactor branch, and the phase-selecting switching-on breaker BK1 is connected with an alternating current power supply G and the input end of the resonant circuit; the auxiliary breaker QF is connected with the output end of the resonant circuit and the input end of the tested direct current breaker;
the voltage source loop comprises a pulse main capacitor C S High-voltage ignition ball Gap and high-voltage reactor L S Frequency modulationA branch; high-voltage reactor L S The input end is connected with an auxiliary breaker QF, and the output end is sequentially connected with a high-voltage ignition ball Gap and a pulse main capacitor C S To a public or ground terminal; one end of the frequency modulation branch is connected with the high-voltage reactor L S The other end of the input end is connected with a public end or a ground end; the arrester energy consumption branch is connected in parallel with the frequency modulation branch;
and the tested direct current breaker is connected with the frequency modulation branch circuit and the lightning arrester energy consumption branch circuit in parallel.
As a further improvement of the invention, the tested direct current breaker comprises a fracture SP and a current converting branch S, wherein the fracture SP and the current converting branch S are connected in parallel; one end T of the current converting branch S is connected to the input end of the auxiliary breaker QF, and the other end of the current converting branch S is connected to the public end or the ground end; one end T of the fracture SP is connected to the output end of the auxiliary breaker QF and the high-voltage resistor L S The other end of the input end is connected with the public end or the ground end and is connected with the frequency modulation branch and the lightning arrester energy consumption branch in parallel.
As a further improvement of the invention, a pair of protection balls BQ are connected in series between the resonance loop side of the auxiliary breaker QF and the public end or the ground end.
As a further development of the invention, the ac power supply G is a surge generator or a network power supply of the capacity test station.
As a further development of the invention, the frequency modulation branch comprises a frequency modulation resistor R 0 And frequency modulation capacitor C 0 FM resistor R 0 And frequency modulation capacitor C 0 And (3) connecting in series.
A test method for a high-voltage direct-current breaker breaking branch small-current breaking test loop comprises the following steps:
setting test loop parameters according to test requirements;
switching action time sequence control and data waveform analysis:
1) At the moment 0, the phase-selecting and switching-on circuit breaker BK1 and the phase-selecting and switching-on circuit breaker BK2 are switched off, the auxiliary circuit breaker QF is switched on, the tested direct current circuit breaker fracture SP is switched on, and the current converting branch S and the high-voltage ignition ball Gap are triggered;
2) At time t1, the phase-selecting switching-on breaker BK1 is switched off, and the tested direct current breaker flows through the power frequency alternating current;
3) At time t2, the phase-selecting switching-on breaker BK2 is closed, the reactor L and the capacitor C form a resonant circuit, and the tested direct current breaker flows through direct current test current;
4) At time t3, the fracture SP of the tested direct current breaker is opened;
5) At time t4, the auxiliary breaker QF is opened;
6) At time t5, when the opening distance of the fracture SP and the auxiliary breaker QF meets the requirement, triggering a commutation branch S and enabling the fracture SP to be opened in a zero crossing way, enabling the auxiliary breaker QF to be opened and forming an isolation fracture;
7) At time t6, the high-voltage ignition ball Gap branch is triggered, and the tested direct current breaker fracture SP bears transient recovery voltage U generated by voltage source loop oscillation r The lightning arrester is active or inactive.
As a further improvement of the invention, the initial position of the phase-selecting on-off breaker BK1 is the off-gate, and the initial position of the phase-selecting on-off breaker BK2 is the off-gate; in the test, the phase-selecting on-off breaker BK1 is turned on at the voltage peak of the ac power supply G, and the phase-selecting on-off breaker BK2 is turned on at the current peak of the capacitor branch C or at a set angle.
As a further improvement of the invention, the direct current test current flowing through the tested breaker at the moment of closing the phase-selecting closing breaker BK2 is as follows:
where U is the AC power supply voltage, ω is the angular frequency,for phase selection and switching phase angle, τ is the inherent DC time constant of the loop.
As a further development of the invention, the pulsed main capacitor C of the voltage source circuit S Charging to preset voltage in advance, after the auxiliary breaker QF is opened, the high-voltage ignition ball Gap is quickly penetrated, and the main capacitor C S For high-voltage reactor L S Discharging frequency modulation branch to generate oscillation transientState recovery voltage U r And applies the voltage across the break of the circuit breaker under test.
As a further improvement of the invention, when the transient recovery voltage between the tested direct current breaker breaks reaches the action voltage of the lightning arrester, the lightning arrester acts, and the highest recovery voltage born between the breaks is the residual voltage U of the lightning arrester P 。
Compared with the prior art, the invention has at least the following technical effects:
the invention provides a high-voltage direct current breaker breaking branch small-current breaking test loop, which comprises a direct current source loop, a voltage source loop and a tested direct current breaker. The direct current source loop consists of an alternating current power supply G, a phase-selecting on-off breaker BK1, a phase-selecting on-off breaker BK2, an auxiliary breaker QF, a reactor L and a capacitor C. The voltage source loop consists of a pulse main capacitor C S High-voltage ignition ball Gap and high-voltage reactor L S Frequency modulation branch R 0 And C 0 Composition is prepared. The tested direct current breaker consists of a fracture commutation branch SP and a commutation branch S. During the test, through the phase-selecting and switching-on/off breaker BK1 and the phase-selecting and switching-on breaker BK2, the direct current source circuit generates direct current test current required by the test, after the fracture commutation branch SP breaks the direct current test current, the auxiliary breaker QF isolates the direct current source circuit and the commutation branch simultaneously, the high-voltage ignition ball Gap of the voltage source circuit is conducted, expected transient recovery voltage is applied to the fracture commutation branch SP, and the electrical breakdown resistance between the fractures is checked.
Drawings
FIG. 1 is a circuit diagram of a synthetic loop of a small current break test according to an embodiment of the present invention;
FIG. 2 is a timing control diagram of a small current on-off test according to an embodiment of the present invention;
fig. 3 is a waveform diagram of simulation calculation of a small current break test according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention will be described in detail below with reference to the drawings and the detailed description.
As shown in figure 1, the breaking branch small current breaking test loop of the high-voltage direct current breaker comprises a direct current source loop, a voltage source loop and a tested direct current breaker.
The direct current source loop is composed of an alternating current power supply G, a phase-selecting and switching-on breaker BK1, a phase-selecting and switching-off breaker BK2, an auxiliary breaker QF, a reactor L and a capacitor C.
The reactor L and the capacitor C are connected in parallel to form a resonant circuit, the phase-selecting switching breaker BK2 is connected in series in a reactor branch, and the phase-selecting switching breaker BK1 is connected with an alternating current power supply G and the input end of the resonant circuit. And the auxiliary breaker QF is connected with the output end of the resonant circuit and the input end of the tested direct current breaker, and when the tested breaker breaks the test current, the auxiliary breaker QF is opened to form an isolation fracture protection direct current source loop.
The voltage source loop consists of a pulse main capacitor C S High-voltage ignition ball Gap and high-voltage reactor L S Frequency modulation branch R 0 And C 0 Composition is prepared. High-voltage reactor L S The input end is connected with an auxiliary breaker QF, and the output end is sequentially connected with a high-voltage ignition ball Gap and a pulse main capacitor C S To a public or ground terminal; one end of the frequency modulation branch is connected with the high-voltage reactor L S The other end of the input end is connected with a public end or a ground end; the arrester energy consumption branch is connected in parallel with the frequency modulation branch;
the tested direct current breaker consists of a fracture SP and a current converting branch S. One end T of the fracture SP is connected to the output end of the auxiliary breaker QF and the high-voltage resistor L S The other end of the input end is connected with the public end or the ground end and is connected with the frequency modulation branch and the lightning arrester energy consumption branch in parallel.
The tested direct current breaker is connected in parallel with the frequency modulation branch and the lightning arrester energy consumption branch, and the tested direct current breaker consists of a fracture SP and a converting branch S.
In the embodiment of the invention, a pair of protection balls BQ are connected in series between the side of the resonant circuit of the auxiliary breaker QF and the public end or the ground end, and when the auxiliary breaker QF is broken down by the high voltage of the voltage source circuit, the BQ breaks down to protect the direct current source circuit.
Wherein the fracture SP is connected in parallel with the converter branch S; one end T of the current converting branch S is connected to the input end of the auxiliary breaker QF, and the other end of the current converting branch S is connected to the public end or the ground end; one end T of the fracture SP is connected to the output end of the auxiliary breaker QF and the high-voltage resistor L S The other end of the input end is connected with the public end or the ground end and is connected with the frequency modulation branch and the lightning arrester energy consumption branch in parallel.
According to the circuit, during testing, through the phase-selecting and phase-selecting circuit breaker BK1 and the phase-selecting and phase-selecting circuit breaker BK2, the direct current source circuit generates direct current test current required by the test, after the direct current test current is cut off by the fracture SP, the auxiliary circuit breaker QF isolates the direct current source circuit and the converting branch circuit at the same time, the high-voltage ignition ball Gap of the voltage source circuit is conducted, expected transient recovery voltage is applied to the tested direct current circuit breaker fracture SP, and the electric breakdown resistance between the fractures is checked.
Based on fig. 1, the invention also provides a test method for the small-current breaking test loop of the breaking branch of the high-voltage direct-current breaker, which comprises the following steps:
setting test loop parameters according to test requirements;
switching action time sequence control and data waveform analysis:
1) At the moment 0, the phase-selecting and switching-on circuit breaker BK1 and the phase-selecting and switching-on circuit breaker BK2 are switched off, the auxiliary circuit breaker QF is switched on, the tested direct current circuit breaker fracture SP is switched on, and the current converting branch S and the high-voltage ignition ball Gap are triggered;
2) At time t1, the phase-selecting switching-on breaker BK1 is switched off, and the tested direct current breaker flows through the power frequency alternating current;
3) At time t2, the phase-selecting switching-on breaker BK2 is closed, the reactor L and the capacitor C form a resonant circuit, and the tested direct current breaker flows through direct current test current;
4) At time t3, the fracture SP of the tested direct current breaker is opened;
5) At time t4, the auxiliary breaker QF is opened;
6) At time t5, when the opening distance of the fracture SP and the auxiliary breaker QF meets the requirement, triggering a commutation branch S and enabling the fracture SP to be opened in a zero crossing way, enabling the auxiliary breaker QF to be opened and forming an isolation fracture;
7) At time t6, the high-voltage ignition ball Gap branch is triggered, and the fracture SP bears transient recovery voltage U generated by voltage source loop oscillation r The lightning arrester is active or inactive.
Wherein, the initial position of the phase-selecting on-off breaker BK1 is the off-gate, and the initial position of the phase-selecting on-off breaker BK2 is the off-gate. In the test, the phase-selecting on-off breaker BK1 is turned on at the voltage peak of the ac power supply G, and the phase-selecting on-off breaker BK2 is turned on at the current peak of the capacitor branch C or at a set angle.
The direct current test current flowing through the tested breaker at the moment of closing the phase-selecting closing breaker BK2 is as follows:
where U is the AC power supply voltage, ω is the angular frequency,for phase selection and switching phase angle, τ is the inherent DC time constant of the loop.
Pulse main capacitor C of voltage source loop S Charging to preset voltage in advance, after the auxiliary breaker QF is opened, the high-voltage ignition ball Gap is quickly penetrated, and the main capacitor C S For high-voltage reactor L S Frequency modulation branch R 0 And frequency modulation capacitor C 0 Discharging, generating an oscillating transient recovery voltage U r And applying the voltage to both ends of the break of the tested breaker to check the insulation recovery performance of the tested direct current breaker.
Optionally, when the transient recovery voltage between the tested direct current breaker breaks reaches the action voltage of the lightning arrester, the lightning arrester acts, and the highest recovery voltage born between the breaks is avoidedResidual voltage U of lightning device P 。
And combining the test loop circuit diagram shown in fig. 1, and applying the time sequence control diagram shown in fig. 2 to realize the small current breaking test of the breaking branch of the combined high-voltage direct-current breaker. The test parameters of the breaking branch are as follows: rated voltage is 110kV, transient recovery voltage between fracture is 150kV, test current is 1kA, and recovery voltage rising rate is highThe specific embodiments are as follows:
s1, setting parameters of a test loop:
1.1 Ac power supply G is a surge generator of the capacity test station, and the set output voltage is 10kV and the frequency is 50Hz.
1.2 The reactor impedance of the resonant branch is 10Ω and the capacitor impedance is 10Ω. That is, the reactance is about 0.032H and the capacitance is about 320uF.
1.3 Converter branch capacitor C) S 21 mu F, charging voltage of 2.5kV and reactor L S 33.4. Mu.H.
1.4 Main capacitor C of voltage source loop S 2.9 mu F, 165kV charging voltage and high-voltage reactor L S 0.03H, frequency modulation branch R 0 3040 Ω, FM capacitor C 0 0.04. Mu.F.
S2, switching action time sequence control and data waveform analysis:
2.1 Time 0), namely: and (5) an initial state. The phase-selecting and switching-on circuit breaker BK1 and the phase-selecting and switching-on circuit breaker BK2 are switched off, the auxiliary circuit breaker QF is switched on, the tested direct current circuit breaker fracture commutation branch SP is switched on, and the commutation branch S and the high-voltage ignition ball Gap are triggered.
2.2 At time t1 (0.1 s), the phase-selecting and switching-on breaker BK1 is closed, and the tested direct current breaker flows power frequency alternating current with the amplitude of 1 kA.
2.3 At time t2 (0.145 s), the phase-selecting switching breaker BK2 is closed, the reactor L and the capacitor C form a resonant circuit, and the tested direct current breaker flows a direct current test current with the amplitude of 1 kA.
2.4 At time t3 (0.2 s), the break SP of the tested direct current breaker is opened.
2.5 At time t4 (0.202 s), auxiliary breaker QF is opened.
2.6 At time t5 (0.212S), when the opening distance of the fracture SP and the auxiliary breaker QF meets the requirement, the branch of the current converting branch S is triggered, the fracture SP is opened by zero crossing, the auxiliary breaker QF is opened, and an isolation fracture is formed.
2.7 At time t6 (0.2126 s), the high-voltage ignition ball Gap branch is triggered, and the fracture SP bears the transient recovery voltage U generated by the voltage source loop oscillation r The voltage peak value is 160kV, and the lightning arrester does not act.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (10)
1. The high-voltage direct-current breaker breaking branch small-current breaking test loop is characterized by comprising a direct-current source loop, a voltage source loop and a tested direct-current breaker;
the direct current source loop comprises an alternating current power supply G, a phase-selecting on-off breaker BK1, a phase-selecting on-off breaker BK2, an auxiliary breaker QF, a reactor L and a capacitor C; the reactor L and the capacitor C are connected in parallel to form a resonant circuit, the phase-selecting switching-on breaker BK2 is connected in series in a reactor branch, and the phase-selecting switching-on breaker BK1 is connected with an alternating current power supply G and the input end of the resonant circuit; the auxiliary breaker QF is connected with the output end of the resonant circuit and the input end of the tested direct current breaker;
the voltage source loop comprises a pulse main capacitor C S High-voltage ignition ball Gap and high-voltage reactor L S A frequency modulation branch; high-voltage reactor L S The input end is connected with an auxiliary breaker QF, and the output end is sequentially connected with a high-voltage ignition ball Gap and a pulse main capacitor C S To a public or ground terminal; one end of the frequency modulation branch is connected with the high-voltage reactor L S The other end is connected with the input end ofA public terminal or a ground terminal; the arrester energy consumption branch is connected in parallel with the frequency modulation branch;
and the tested direct current breaker is connected with the frequency modulation branch circuit and the lightning arrester energy consumption branch circuit in parallel.
2. The high voltage direct current breaker breaking branch small current breaking test circuit according to claim 1, wherein: the tested direct current breaker comprises a fracture SP and a current converting branch S; the fracture SP is connected with the converter branch S in parallel; one end T of the current converting branch S is connected to the input end of the auxiliary breaker QF, and the other end of the current converting branch S is connected to the public end or the ground end; one end T of the fracture SP is connected to the output end of the auxiliary breaker QF and the high-voltage resistor L S The other end of the input end is connected with the public end or the ground end and is connected with the frequency modulation branch and the lightning arrester energy consumption branch in parallel.
3. The high voltage direct current breaker breaking branch small current breaking test circuit according to claim 1, wherein: and a pair of protection balls BQ are connected in series between the side of the QF resonant circuit of the auxiliary circuit breaker and the public end or the ground end.
4. The high voltage direct current breaker breaking branch small current breaking test circuit according to claim 1, wherein: the alternating current power supply G is an impact generator or a network power supply of the capacity test station.
5. The high voltage direct current breaker breaking branch small current breaking test circuit according to claim 1, wherein: the frequency modulation branch comprises a frequency modulation resistor R 0 And frequency modulation capacitor C 0 FM resistor R 0 And frequency modulation capacitor C 0 And (3) connecting in series.
6. A test method of a high voltage direct current breaker breaking branch small current breaking test loop as claimed in any one of claims 1 to 5, characterized by comprising the following steps: comprising the following steps:
setting test loop parameters according to test requirements;
switching action time sequence control and data waveform analysis:
1) At the moment 0, the phase-selecting and switching-on circuit breaker BK1 and the phase-selecting and switching-on circuit breaker BK2 are switched off, the auxiliary circuit breaker QF is switched on, the tested direct current circuit breaker fracture SP is switched on, and the current converting branch S and the high-voltage ignition ball Gap are triggered;
2) At time t1, the phase-selecting switching-on breaker BK1 is switched off, and the tested direct current breaker flows through the power frequency alternating current;
3) At time t2, the phase-selecting switching-on breaker BK2 is closed, the reactor L and the capacitor C form a resonant circuit, and the tested direct current breaker flows through direct current test current;
4) At time t3, the fracture SP of the tested direct current breaker is opened;
5) At time t4, the auxiliary breaker QF is opened;
6) At time t5, when the opening distance of the fracture SP and the auxiliary breaker QF meets the requirement, triggering a commutation branch S and enabling the fracture SP to be opened in a zero crossing way, enabling the auxiliary breaker QF to be opened and forming an isolation fracture;
7) At time t6, the high-voltage ignition ball Gap branch is triggered, and the tested direct current breaker fracture SP bears transient recovery voltage U generated by voltage source loop oscillation r The lightning arrester is active or inactive.
7. The assay method of claim 6, wherein:
the initial position of the phase-selecting on-off breaker BK1 is an off-gate, and the initial position of the phase-selecting on-off breaker BK2 is an off-gate; in the test, the phase-selecting on-off breaker BK1 is turned on at the voltage peak of the ac power supply G, and the phase-selecting on-off breaker BK2 is turned on at the current peak of the capacitor branch C or at a set angle.
8. The assay method of claim 6, wherein:
the direct current test current flowing through the tested breaker at the moment of closing the phase-selecting closing breaker BK2 is as follows:
where U is the AC power supply voltage, ω is the angular frequency,for phase selection and switching phase angle, τ is the inherent DC time constant of the loop.
9. The assay method of claim 6, wherein:
the pulse main capacitor C of the voltage source loop S Charging to preset voltage in advance, after the auxiliary breaker QF is opened, the high-voltage ignition ball Gap is quickly penetrated, and the main capacitor C S For high-voltage reactor L S Discharging the frequency modulation branch to generate an oscillating transient recovery voltage U r And applies the voltage across the break of the circuit breaker under test.
10. The assay method of claim 6, wherein:
when the transient recovery voltage between the tested direct current breaker breaks reaches the action voltage of the lightning arrester, the lightning arrester acts, and the highest recovery voltage born between the breaks is the residual voltage U of the lightning arrester P 。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117192354A (en) * | 2023-11-01 | 2023-12-08 | 华北电力科学研究院有限责任公司 | Hybrid high-voltage direct-current breaker test loop, method and device |
| CN117607677A (en) * | 2023-12-20 | 2024-02-27 | 南方电网调峰调频发电有限公司 | Non-power frequency breaking test device and test method for generator circuit breaker |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117192354A (en) * | 2023-11-01 | 2023-12-08 | 华北电力科学研究院有限责任公司 | Hybrid high-voltage direct-current breaker test loop, method and device |
| CN117192354B (en) * | 2023-11-01 | 2024-01-23 | 华北电力科学研究院有限责任公司 | Hybrid high-voltage direct-current breaker test loop, method and device |
| CN117607677A (en) * | 2023-12-20 | 2024-02-27 | 南方电网调峰调频发电有限公司 | Non-power frequency breaking test device and test method for generator circuit breaker |
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