CN112763900B - MOV state measuring circuit and method for energy consumption branch of hybrid direct current breaker - Google Patents

MOV state measuring circuit and method for energy consumption branch of hybrid direct current breaker Download PDF

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Publication number
CN112763900B
CN112763900B CN202011567890.6A CN202011567890A CN112763900B CN 112763900 B CN112763900 B CN 112763900B CN 202011567890 A CN202011567890 A CN 202011567890A CN 112763900 B CN112763900 B CN 112763900B
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energy consumption
mov
consumption branch
current
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CN112763900A (en
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刘懿莹
王心怡
姚学玲
李维康
于鹏浩
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Shaanxi Tongda Cable Manufacture Co ltd
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Xian Jiaotong University
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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
    • G01R31/3275—Fault detection or status indication
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass

Abstract

The invention discloses a hybrid straight pipeThe MOV state measuring circuit comprises a grounding circuit and a leakage ammeter, wherein the grounding circuit and the leakage ammeter are connected in series at the output end of the energy consumption branch, and an isolating switch Q is arranged between the leakage ammeter and the output end of the energy consumption branchS4An isolating switch Q is connected between the output end of the energy consumption branch and the output end of the transfer branchS3An isolating switch Q is connected between the output end of the energy consumption branch and the output end of the transfer branchS3The direct current circuit breaker comprises a grounding loop, a leakage ammeter, a leakage current meter, a measurement loop and a power consumption branch detection loop, wherein the grounding loop and the leakage ammeter are connected in series to form a power consumption branch detection loop, the leakage ammeter is used for supplying power through a direct current circuit, the leakage current meter is used for detecting the MOV leakage current of the power consumption branch, and the MOV leakage current of the power consumption branch is detected through the measurement loop to judge whether the MOV state of the power consumption branch is good or not.

Description

MOV state measuring circuit and method for energy consumption branch of hybrid direct current breaker
Technical Field
The invention belongs to the technical field of equipment state detection, and relates to a hybrid direct current breaker energy dissipation branch MOV state measuring circuit and method.
Background
With the rapid development of flexible direct-current power grids, hybrid direct-current circuit breakers with a function of rapidly cutting off fault current are receiving more and more attention. The existing hybrid direct-current circuit breaker mainly adopts a hybrid circuit topology formed by connecting a main branch, a transfer branch and an energy consumption branch in parallel, under the normal working condition, the main branch is in a long-term through-current state, and the transfer branch and the energy consumption branch are both in a sleep state, so that the effectiveness of the protection action of the circuit breaker is difficult to judge, and the hidden danger that the power grid fault cannot be quickly removed exists. And because the topology of the hybrid direct current circuit breaker is completely different from that of the conventional alternating current circuit breaker, auxiliary circuits such as transfer, energy consumption and the like are added, so that the online monitoring method for the conventional alternating current circuit breaker cannot be completely suitable for the hybrid direct current circuit breaker. Meanwhile, the aging of each branch component of the hybrid direct current circuit breaker and the change of environmental conditions can cause the change of the performance of the circuit breaker in different degrees, so the state detection and evaluation of the sleep component are necessary.
In the process of breaking the fault current, the hybrid direct current circuit breaker needs to dissipate energy stored in a system inductor through a power consumption branch circuit, and in the topology structure, the preferred element of the power consumption branch circuit is a Metal Oxide Varistor (MOV). Meanwhile, in the switching-on and switching-off process, transient switching-on and switching-off voltage of the hybrid direct current circuit breaker is limited by the protection characteristic of the MOV, the MOV is a key device for protecting the hybrid direct current circuit breaker, and the quality of the switching-on and switching-off performance of the hybrid direct current circuit breaker is influenced by the quality of the protection performance of the MOV.
The currently disclosed method and system for monitoring the lightning arrester of the hybrid direct-current circuit breaker (published patent CN201810664503.7) calculate the energy consumption branch current of the hybrid direct-current circuit breaker by measuring the line side current, the main branch current and the transfer branch current of N groups of hybrid direct-current circuit breakers, and compare the energy consumption branch current of the hybrid direct-current circuit breaker with the current limit of the leakage threshold of the lightning arrester to determine whether the lightning arrester is abnormal. However, 3N sets of optical fiber current transformers and N sets of combining units are needed for measuring line side current, main branch current and transfer branch current of the N sets of hybrid direct current circuit breakers, the number of devices is large, and the requirement on long-term operation reliability of the optical fiber current transformers is high.
The MOV of the energy consumption branch circuit is equivalently bypassed under the normal operation of the hybrid direct current breaker, the voltage at two ends of the energy consumption branch circuit is almost zero, and the MOV state detection cannot be carried out under the state. Therefore, in order to quickly and accurately determine the MOV state of the dissipative branch, a new active state measurement method is needed.
Disclosure of Invention
The invention aims to provide an MOV state measuring circuit and method for an energy consumption branch of a hybrid direct current breaker, so as to overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a MOV state measuring circuit for energy-consuming branch of mixed DC breaker is composed of ground loop, leakage current meter, and ground loopThe leakage ammeter is connected in series with the output end of the energy consumption branch circuit, and an isolating switch Q is arranged between the leakage ammeter and the output end of the energy consumption branch circuitS4An isolating switch Q is connected between the output end of the energy consumption branch and the output end of the transfer branchS3。
Furthermore, the hybrid direct current circuit breaker comprises a main branch, a transfer branch and an energy consumption branch which are connected in parallel, wherein the input end of the energy consumption branch is connected with a direct current power supply E, and the input ends of the direct current power supply E and the energy consumption branch are sequentially connected with an inductor L and a disconnecting switch QS1The output end of the transfer branch is sequentially connected with an isolating switch QS2Resistance RL and ground return.
A hybrid direct current breaker energy dissipation branch MOV state measuring method comprises the following steps: under the condition that the hybrid direct current breaker is normally connected, the output end of the energy consumption branch circuit is disconnected with the output end of the main branch circuit, under the condition that the energy consumption branch circuit is normally connected with a power supply of the main branch circuit, the magnitude of leakage current of the energy consumption branch circuit is measured, if the leakage current of the energy consumption branch circuit is larger than a set threshold value, the MOV state of the energy consumption branch circuit is abnormal, and otherwise, the MOV state of the energy consumption branch circuit is normal.
Further, the set threshold is twice the maximum value of the historical value of the MOV leakage current of the energy consumption branch circuit.
Furthermore, the maximum value of the historical value of the MOV leakage current of the energy consumption branch circuit is obtained by adopting an impact test experiment, an impact circuit is adopted to impact the MOV valve plates in the same batch with the MOV in the energy consumption branch circuit to be tested, the leakage current of the MOV valve plates under different impact degrees is detected, and the maximum leakage current which enables the MOV valve plates to meet the requirements is obtained and is the maximum value of the historical value.
Further, the surge circuit includes a voltage regulator T1High voltage transformer T2And the element to be tested comprises a high-voltage rectifying element D and a current-limiting resistor R0An energy storage capacitor C, a wave modulation resistor R, a wave modulation inductor L and a first resistance voltage divider R1A second resistor divider R2And a flow divider RS(ii) a Voltage regulator T1And a high voltage transformer T2Is connected with the positive pole of the high-voltage rectifier element D and the high-voltage transformer T2Secondary winding ofOne end of the group is connected with the negative electrode of the high-voltage rectifier element D and the current-limiting resistor R0One end connected to a current limiting resistor R0The other end is connected with one end of an energy storage capacitor C, and a current limiting resistor R0An isolation gap G is arranged between the other end of the energy storage capacitor C and one end of the wave modulating resistor R, and the other end of the energy storage capacitor C and the high-voltage transformer T2The other end of the secondary winding of (2), a shunt RSOne end of the connection is connected with a high-voltage transformer T2The other end of the secondary winding is a current output end; the other end of the wave modulating resistor R is connected with one end of a wave modulating inductor L, and the other end of the wave modulating inductor L is connected with a first resistor divider R1One end connected, a first resistive divider R1The other end of the resistor divider R is connected with a second resistor divider R2One end connected, a first resistive divider R1The other end of the resistor divider R is connected with a second resistor divider R2With voltage output between one end, a first resistive divider R1And a second resistor divider R2The other end is connected with a test piece F and a second resistance voltage divider R2The other end and the current divider RSThe other end of the first connecting rod is connected with the rear ground.
Further, the high-voltage rectifying element D is a diode.
A method for measuring MOV state of energy-consuming branch of mixed DC breaker includes such steps as providing a Q isolating switchS3Is connected in series between the energy consumption branch and the transfer branch, and is provided with an isolating switch QS4And the measuring loop is connected with the energy consumption branch in series, and when the state of the energy consumption branch of the hybrid direct current circuit breaker is measured, the isolating switch Q is firstly openedS3Then closing the isolating switch QS4And the MOV of the energy consumption branch is put into a measuring loop, the leakage current of the energy consumption branch is detected through a leakage current meter, the leakage current of the energy consumption branch is measured, if the leakage current of the energy consumption branch is greater than a set threshold value, the MOV state of the energy consumption branch is abnormal, otherwise, the MOV state of the energy consumption branch is normal.
Further, the set threshold is twice the maximum value of the historical value of the MOV leakage current of the energy consumption branch circuit.
Further, the maximum value of the historical value of the MOV leakage current of the energy consumption branch is obtained by adopting an impact test experiment.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a hybrid direct current breaker energy consumption branch MOV state measuring circuit which comprises a grounding circuit and a leakage ammeter, wherein the grounding circuit and the leakage ammeter are connected in series at the output end of an energy consumption branch, and an isolating switch Q is arranged between the leakage ammeter and the output end of the energy consumption branchS4An isolating switch Q is connected between the output end of the energy consumption branch and the output end of the transfer branchS3An isolating switch Q is connected between the output end of the energy consumption branch and the output end of the transfer branchS3The direct current circuit breaker comprises a grounding loop, a leakage ammeter, a leakage current meter, a measurement loop and a power consumption branch detection loop, wherein the grounding loop and the leakage ammeter are connected in series to form a power consumption branch detection loop, the leakage ammeter is used for supplying power through a direct current circuit, the leakage current meter is used for detecting the MOV leakage current of the power consumption branch, and the MOV leakage current of the power consumption branch is detected through the measurement loop to judge whether the MOV state of the power consumption branch is good or not.
According to the method for measuring the MOV state of the energy-consuming branch of the hybrid direct-current circuit breaker, the MOV leakage current of the energy-consuming branch can be measured under the condition that the hybrid direct-current circuit breaker normally works, namely a main branch normally flows, so that the quality of the running state of the hybrid direct-current circuit breaker can be quickly judged; the problem that the state detection of the energy-consuming branch circuit cannot be carried out under the normal working condition of the hybrid direct-current circuit breaker is solved through the active measuring method for the MOV state of the energy-consuming branch circuit.
Furthermore, an impact circuit is adopted to impact the MOV valve plate in the energy consumption branch, the MOV valve plate in different aging states before and after impact is utilized to detect leakage current, and the effectiveness of the MOV state in the energy consumption branch can be rapidly verified.
Drawings
FIG. 1 is a schematic diagram of a measurement circuit according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a measuring circuit in a non-connected working state according to an embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating an access operation state of a measurement circuit according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a feasibility simulation result in an embodiment of the invention, fig. 4(a) is a voltage waveform diagram of an energy-consuming branch of the hybrid dc circuit breaker, fig. 4(b) is a current waveform diagram of an energy-consuming branch of the hybrid dc circuit breaker, and fig. 4(c) is a current waveform diagram of a main branch of the hybrid dc circuit breaker.
FIG. 5 is a schematic diagram of a surge current generation circuit according to an embodiment of the present invention.
FIG. 6 is a diagram showing an impulse current waveform according to an embodiment of the present invention, FIG. 6(a) is a diagram showing an original current waveform, and FIG. 6(b) is a diagram showing a wavefront time T1Fig. 6(c) shows the tail half-peak time T of the current waveform of 135 μ s22970 mus.
FIG. 7 is a schematic diagram of an accelerated shock aging current waveform and a residual voltage waveform in accordance with an embodiment of the present invention, and FIG. 7(a) is a current peak 175A, 135/2970 μ s shock current waveform and MOV residual voltage waveform; FIG. 7(b) is a current peak 200A, 135/2970 μ s rush current waveform and MOV residual voltage waveform.
In the figure, T1: voltage regulator, T2: high-voltage transformer, D: high voltage rectifier element, R0: current limiting resistor, C: energy storage capacitor, G: isolation gap, R: wave modulation resistance, L: wave-modulating inductance, F: test piece, R1A first resistor divider R2: second resistor divider, RS: a flow divider.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, a hybrid dc circuit breaker energy consumption branch MOV state measuring circuit includes a main branch, a transfer branch and an energy consumption branch connected in parallel, wherein an input end of the energy consumption branch is connected to a dc power supply E, and an inductor L and a disconnecting switch Q are sequentially connected to the dc power supply E and the input end of the energy consumption branchS1The output end of the transfer branch is sequentially connected with an isolating switch QS2A resistor RL and a ground return circuit; the energy-consumption measuring device comprises a grounding circuit and a leakage current meter, wherein the grounding circuit and the leakage current meter are connected in series at the output end of an energy-consumption branch circuit, and an isolating switch Q is arranged between the leakage current meter and the output end of the energy-consumption branch circuitS4Of energy-consuming branchesAn isolating switch Q is connected between the output end and the output end of the transfer branchS3。
A hybrid direct current breaker energy dissipation branch MOV state measuring method comprises the following steps: under the condition that the hybrid direct current breaker is normally connected, the output end of the energy consumption branch circuit is disconnected with the output end of the main branch circuit, under the condition that the energy consumption branch circuit is normally connected with a power supply of the main branch circuit, the magnitude of leakage current of the energy consumption branch circuit is measured, if the leakage current of the energy consumption branch circuit is larger than a set threshold value, the MOV state of the energy consumption branch circuit is abnormal, and otherwise, the MOV state of the energy consumption branch circuit is normal. Specifically, the set threshold is twice the maximum value of the historical value of the MOV leakage current of the energy consumption branch circuit.
A hybrid DC breaker energy dissipation branch MOV state measuring impact circuit comprises a voltage regulator T1High voltage transformer T2And the element to be tested comprises a high-voltage rectifying element D and a current-limiting resistor R0An energy storage capacitor C, a wave modulation resistor R, a wave modulation inductor L and a first resistance voltage divider R1A second resistor divider R2And a flow divider RS(ii) a Voltage regulator T1And a high voltage transformer T2Is connected with the positive pole of the high-voltage rectifier element D and the high-voltage transformer T2Is connected with one end of the secondary winding, the negative pole of the high-voltage rectifying element D is connected with the current-limiting resistor R0One end connected to a current limiting resistor R0The other end is connected with one end of an energy storage capacitor C, and a current limiting resistor R0An isolation gap G is arranged between the other end of the energy storage capacitor C and one end of the wave modulating resistor R, and the other end of the energy storage capacitor C and the high-voltage transformer T2The other end of the secondary winding of (2), a shunt RSOne end of the connection is connected with a high-voltage transformer T2The other end of the secondary winding is a current output end; the other end of the wave modulating resistor R is connected with one end of a wave modulating inductor L, and the other end of the wave modulating inductor L is connected with a first resistor divider R1One end connected, a first resistive divider R1The other end of the resistor divider R is connected with a second resistor divider R2One end connected, a first resistive divider R1The other end of the resistor divider R is connected with a second resistor divider R2With voltage output between one end, a first resistive divider R1And a second resistor divider R2The other end is connected with a test piece F and a second resistance voltage divider R2The other end and the current divider RSThe other end of the first connecting rod is connected with the rear ground. The high-voltage rectifying element D adopts a diode.
Normally, as shown in FIG. 2, the isolation switch QS3Closed, isolating switch QS4And when the circuit is disconnected, the current flows through the main branch of the hybrid direct current circuit breaker. As shown in fig. 3, when the state of the energy-consuming branch of the hybrid dc circuit breaker needs to be measured, the isolation switch Q is turned on firstS3Closing the isolating switch QS4And the MOV of the energy consumption branch is put into the measuring loop, energy is supplied through a direct current circuit, and the MOV leakage current of the energy consumption branch is detected by a leakage ammeter. Because the MOV resistance of the energy consumption branch circuit is far larger than the resistance of the main branch circuit, most of current flows through the main branch circuit, and the action of actively measuring the MOV state of the energy consumption branch circuit can not interfere the normal work of the hybrid direct current circuit breaker; when the leakage current value of the power consumption direct current MOV is increased to more than 2 times of the historical value, the MOV of the power consumption branch circuit can be judged to be abnormal.
According to the working principle of the active MOV state measurement of the energy-consuming branch, the feasibility of the active MOV state measurement is researched in a simulation mode. The following are simulation results: the given direct current line voltage is 5kV, and the isolating switch Q is opened when t is 0.05sS3Turn off the isolating switch QS4And the MOV of the energy consumption branch is put into a measuring loop to carry out active measurement. Respectively detecting voltage waveforms of a main branch, a transfer branch and an energy consumption branch in the hybrid direct current breaker; as shown in fig. 4(a), which is a voltage waveform diagram of the dissipative branch of the hybrid dc circuit breaker, it can be seen from the simulation result that when t is 0.05s, the disconnecting switch Q is openedS3Turn off isolation QS4And then, the measuring loop is powered by a direct current line, and the voltage at two ends of the MOV of the energy consumption branch is about 5 kV. As shown in fig. 4(b), which is a waveform diagram of the current in the energy-consuming branch of the hybrid dc circuit breaker, it can be seen from the simulation result that when t is 0.05s, the Q-switch is turned onS3Turn off isolation QS4And then, the measuring loop is powered by a direct current line, leakage current flows through the MOV of the energy consumption branch, and the operation state can be judged by detecting the magnitude of the leakage current. FIG. 4(c) is a waveform diagram of the main branch current of the hybrid DC breaker, which can be simulated byThe result shows that when t is 0.05s, the isolating switch Q is openedS3Turn off isolation QS4And then, the main branch circuit is not influenced in working, and the action of actively measuring the MOV of the energy consumption branch does not interfere with the normal working of the main branch.
A hybrid direct current breaker energy dissipation branch MOV state measuring method comprises the following steps: under the condition that the hybrid direct current breaker is normally connected, the output end of the energy consumption branch circuit is disconnected with the output end of the main branch circuit, under the condition that the energy consumption branch circuit is normally connected with a power supply of the main branch circuit, the magnitude of leakage current of the energy consumption branch circuit is measured, if the leakage current of the energy consumption branch circuit is larger than a set threshold value, the MOV state of the energy consumption branch circuit is abnormal, and otherwise, the MOV state of the energy consumption branch circuit is normal.
The maximum value of the historical value of the MOV leakage current of the energy consumption branch is obtained by adopting an impact test experiment, an impact circuit is adopted to impact the MOV valve plates in the same batch with the MOV in the energy consumption branch to be tested, the leakage current of the MOV valve plates under different impact degrees is detected, and the maximum leakage current which enables the MOV valve plates to meet the requirements is obtained and is the maximum value of the historical value.
Specifically, the method comprises the following steps: in order to verify the reliability of the hybrid direct current breaker energy consumption branch MOV state active measurement method, aiming at the condition that the MOV of the energy consumption branch is in the active measurement state, the MOV valve plate in different aging states before and after impact is utilized to detect leakage current. The MOV valve plates in different aging states are obtained by performing accelerated impact aging on the MOV valve plates of the same manufacturer and the same model with similar static parameters through an impact current generating circuit shown in FIG. 5, the current waveform is shown in FIG. 6, and FIG. 6(b) is wave front time T1Fig. 6(c) shows the tail half-peak time T of the current waveform of 135 μ s22970 mus. FIG. 7(a) shows the current peak 175A, 135/2970 μ s surge current waveform and MOV residual voltage waveform, and the MOV valve sheet is impacted by the surge current waveform 10 times per cycle, and after multiple cycles of impact, 175A-10 groups of aging test articles are obtained. FIG. 7(b) shows the current peak 200A, 135/2970 μ s surge current waveform and MOV residual voltage waveform, and the MOV valve plate is impacted by the surge current waveform 20 times per cycle, and after multiple cycles of impact, 200A-20 groups of aging test articles are obtained. For non-impact aging test, aging test of 175A-10 groupsThe leakage current of three MOV valve plate samples of the sample and 200A-20 aging samples is detected, and the result is shown in Table 1.
TABLE 1 MOV valve plate leakage Current measurement
Figure BDA0002861532420000081
The leakage current detection result shows that compared with the unaged MOV valve plate, the resistive leakage current values of the MOV valve plates of the 175A-10 groups and the 200A-20 groups are respectively increased to 4.5 times and 5.4 times, and are both more than 2 times, and the MOV valve plate can be judged to be abnormal. According to the invention, the MOV leakage current of the energy consumption branch is detected on the basis of the active MOV state measuring method of the energy consumption branch through experimental verification, so that the MOV state of the energy consumption branch can be detected, and the MOV running state of the energy consumption branch can be judged.

Claims (7)

1. The hybrid direct current breaker energy consumption branch MOV state measuring method is characterized in that the hybrid direct current breaker energy consumption branch MOV state measuring circuit comprises a grounding loop and a leakage ammeter, the grounding loop and the leakage ammeter are connected in series at the output end of the energy consumption branch, and a disconnecting switch Q is arranged between the leakage ammeter and the output end of the energy consumption branchS4An isolating switch Q is connected between the output end of the energy consumption branch and the output end of the transfer branchS3；
The method comprises the following steps: under the condition that the hybrid direct current breaker is normally connected, the output end of the energy consumption branch circuit is disconnected with the output end of the main branch circuit, under the condition that the energy consumption branch circuit is normally connected with a power supply of the main branch circuit, the magnitude of leakage current of the energy consumption branch circuit is measured, if the leakage current of the energy consumption branch circuit is larger than a set threshold value, the MOV state of the energy consumption branch circuit is abnormal, otherwise, the MOV state of the energy consumption branch circuit is normal;
the maximum value of the historical value of the MOV leakage current of the energy consumption branch is obtained by adopting an impact test experiment, an impact circuit is adopted to impact the MOV valve plates in the same batch with the MOV in the energy consumption branch to be tested, the leakage current of the MOV valve plates under different impact degrees is detected, and the maximum leakage current which enables the MOV valve plates to meet the requirements is obtained and is the maximum value of the historical value;
the surge circuit comprises a voltage regulator T1High voltage transformer T2And the element to be tested comprises a high-voltage rectifying element D and a current-limiting resistor R0An energy storage capacitor C, a wave modulation resistor R, a wave modulation inductor L and a first resistance voltage divider R1、Second resistor divider R2And a flow divider RS(ii) a Voltage regulator T1And a high voltage transformer T2Is connected with the positive pole of the high-voltage rectifier element D and the high-voltage transformer T2Is connected with one end of the secondary winding, the negative pole of the high-voltage rectifying element D is connected with the current-limiting resistor R0One end connected to a current limiting resistor R0The other end is connected with one end of an energy storage capacitor C, and a current limiting resistor R0An isolation gap G is arranged between the other end of the energy storage capacitor C and one end of the wave modulating resistor R, and the other end of the energy storage capacitor C and the high-voltage transformer T2The other end of the secondary winding of (2), a shunt RSOne end of the connection is connected with a high-voltage transformer T2The other end of the secondary winding is a current output end; the other end of the wave modulating resistor R is connected with one end of a wave modulating inductor L, and the other end of the wave modulating inductor L is connected with a first resistor divider R1One end connected, a first resistive divider R1The other end of the resistor divider R is connected with a second resistor divider R2One end connected, a first resistive divider R1The other end of the resistor divider R is connected with a second resistor divider R2With voltage output between one end, a first resistive divider R1And a second resistor divider R2The other end is connected with a test piece F and a second resistance voltage divider R2The other end and the current divider RSThe other end of the first connecting rod is connected with the rear ground.
2. The method as claimed in claim 1, wherein the hybrid dc breaker comprises a main branch, a transfer branch and a power consumption branch connected in parallel, wherein an input end of the power consumption branch is connected to a dc power source E, and the dc power source E and the power consumption branch are sequentially connected to an inductor L and a disconnector QS1The output ends of the branch circuits are connected in sequenceIs connected with an isolating switch QS2Resistance RL and ground return.
3. The hybrid direct current breaker dissipative branch MOV status measuring method of claim 2, wherein said set threshold is twice the maximum value of the historical value of the dissipative branch MOV leakage current.
4. The hybrid direct current breaker dissipative shunt MOV state measuring method as claimed in claim 1, wherein the high voltage rectifier device D is a diode.
5. The hybrid direct current breaker dissipative shunt MOV state measuring method of claim 1, wherein a Q-switch is disconnectedS3Is connected in series between the energy consumption branch and the transfer branch, and is provided with an isolating switch QS4And the measuring loop is connected with the energy consumption branch in series, and when the state of the energy consumption branch of the hybrid direct current circuit breaker is measured, the isolating switch Q is firstly openedS3Then closing the isolating switch QS4And the MOV of the energy consumption branch is put into a measuring loop, the leakage current of the energy consumption branch is detected through a leakage current meter, the leakage current of the energy consumption branch is measured, if the leakage current of the energy consumption branch is greater than a set threshold value, the MOV state of the energy consumption branch is abnormal, otherwise, the MOV state of the energy consumption branch is normal.
6. The hybrid direct current breaker dissipative branch MOV state measuring method according to claim 5, wherein the set threshold is twice the maximum value of the historical value of the MOV leakage current of the dissipative branch.
7. The method as claimed in claim 5, wherein the maximum value of the historical value of MOV leakage current of the dissipative branch of the hybrid direct current breaker is obtained by adopting a shock test experiment.
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