CN113552477B - Direct current breaker testing device and control method - Google Patents
Direct current breaker testing device and control method Download PDFInfo
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- CN113552477B CN113552477B CN202110823766.XA CN202110823766A CN113552477B CN 113552477 B CN113552477 B CN 113552477B CN 202110823766 A CN202110823766 A CN 202110823766A CN 113552477 B CN113552477 B CN 113552477B
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- 238000012360 testing method Methods 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004146 energy storage Methods 0.000 claims abstract description 95
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000012546 transfer Methods 0.000 claims description 16
- 238000005265 energy consumption Methods 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 13
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
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- 230000004888 barrier function Effects 0.000 description 2
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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]
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Abstract
The invention relates to a direct current breaker testing device which comprises an energy storage triggering circuit, a first current limiting reactor, a second current limiting reactor, an isolating switch, a follow current switch and a lightning arrester. The energy storage trigger circuit, the isolating switch, the second current limiting reactor and the freewheeling switch are connected in series end to end; the first current limiting reactor, the tested direct current breaker and the follow current switch are connected in series and then connected in parallel at two ends of the energy storage triggering circuit; the lightning arrester is connected in parallel at two ends of the follow current switch. All the equipment of the test device can be arranged in a movable box body, so that the test device is convenient to transport. The invention also relates to a test control method of the movable direct current breaker, which can simulate the tests of short-time current tolerance, fault current breaking, reclosing and the like of the direct current breaker under the actual operation working condition. The invention has simple loop, less equipment types and low investment cost, can be integrally installed in the container, and comprehensively meets the field test requirements of the direct current breaker.
Description
Technical Field
The invention relates to the field of high-voltage power electronics, in particular to a direct-current circuit breaker testing device and a control method.
Background
The direct current circuit breaker is used as key equipment of a multi-terminal direct current transmission system, is used for rapidly isolating and recovering faults, can enrich the operation mode of a direct current power grid, and improves the safety and reliability of the direct current power grid. Due to low impedance of a direct-current power grid, when a short-circuit fault occurs, the fault current rises quickly and has a large peak value; the direct-current circuit breaker can rapidly cut off fault current within milliseconds, cut off a direct-current fault line and realize the isolation of a converter station and a fault point; and after the fault is cleared, the direct current breaker is reclosed, and the stable operation of the direct current power grid is recovered.
The direct current circuit breaker mainly plays a role in transmitting system power, breaking fault current and reclosing to restore line operation in the operation of a direct current power grid. On the site of the converter station, after the direct current breaker is installed and debugged, field test verification of the direct current breaker is quite necessary. The field test of the direct current breaker mainly comprises short-time current tolerance, fault current breaking and reclosing tests. Aiming at the field test requirements of the direct current circuit breaker, the test equipment which is simple in structure, convenient to build and low in cost needs to be provided.
In some solutions in the prior art, a direct current power supply is simulated through a converter rectification solution to perform a direct current breaker current tolerance test, and the solution cannot be used for a direct current breaker field test because a converter station is installed and debugged with a high-voltage alternating current input power supply which cannot be provided on the field.
In other schemes in the prior art, the test loop is complex in structure, multiple in equipment types, large in occupied area, high in cost and high in building difficulty, is only suitable for a direct-current circuit breaker test platform scheme in a fixed site, and cannot meet the field test requirement of the direct-current circuit breaker.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a dc breaker testing apparatus and a control method thereof, which can meet the field test requirements of the dc breaker.
In order to realize the purpose, the invention adopts the following technical scheme: a direct current breaker testing device comprises an energy storage triggering circuit, a first current limiting reactor, a second current limiting reactor, an isolating switch, a freewheeling switch and a lightning arrester; the energy storage trigger circuit, the isolating switch, the second current limiting reactor and the follow current switch are sequentially connected in series end to end; the first current limiting reactor, the tested equipment and the follow current switch are connected in series and then connected in parallel at two ends of the energy storage triggering circuit; the lightning arrester is connected in parallel at two ends of the follow current switch.
Further, the energy storage trigger circuit comprises three groups of energy storage circuits and three groups of trigger circuits, wherein the three groups of energy storage circuits comprise a first energy storage circuit, a second energy storage circuit and a third energy storage circuit, and the three groups of trigger circuits comprise a first trigger circuit, a second trigger circuit and a third trigger circuit; each group of the energy storage circuits and each group of the trigger circuits are connected in series to form a trigger branch circuit, and the three trigger branch circuits are connected in parallel.
Further, each group of energy storage circuits comprises a first energy storage circuit discharge switch and a first energy storage circuit energy storage capacitor; the first energy storage loop discharge switch is connected in parallel with two ends of the first energy storage loop energy storage capacitor, and one end of the first energy storage loop energy storage capacitor is connected with the trigger loop.
Further, the trigger circuits and the follow current switches of each group have the same structure and at least comprise one switch, and the switches are sequentially connected in series.
Further, the switch is a power semiconductor device, a mechanical switch or a trigger gap.
Further, the inductance value of the first current limiting reactor is much smaller than the inductance value of the second current limiting reactor.
Further, the device to be tested is a direct current breaker or a direct current breaker assembly.
A test control method of a direct current breaker is realized based on the test device and comprises the following steps: the control method comprises the steps of sequentially carrying out short-time current tolerance, fault current breaking and reclosing tests on the direct-current circuit breaker and carrying out the short-time current tolerance test on a direct-current circuit breaker assembly.
Further, carry out short-time current tolerance, fault current breaking and reclosing test to direct current circuit breaker in proper order, include:
controlling a test device to generate system current;
judging whether the system current reaches a preset first current threshold value or not, and carrying out a short-time current tolerance test;
when the direct current breaker finishes short-term current tolerance, the freewheeling switch is switched on again, the system current flows back to the energy storage trigger circuit through the freewheeling switch, and when the system current reaches zero, the first trigger circuit is controlled to be switched off and the isolating switch is separated;
when the isolating switch reaches the sub-position, the second trigger circuit is controlled to be conducted, and the energy storage capacitor of the second energy storage circuit generates fault current through the first current limiting reactor;
judging whether the barrier current reaches a preset second current threshold value or not, and carrying out a fault current on-off test;
after preset time delay, controlling a third trigger circuit to be conducted, simultaneously conducting a transfer branch of the direct current breaker, and simulating the direct current breaker to be recombined to a fault, wherein the energy storage capacitor of the third energy storage circuit generates fault current again through a first current limiting reactor;
judging whether the fault current generated again reaches a preset third current threshold value or not, and performing a reclosing test;
and after the preset time delay, the direct current breaker is switched on, and when the direct current breaker is successfully switched on again, the direct current breaker completes the reclosing test.
Further, a short-time current withstand test is performed on the direct current breaker assembly, comprising:
controlling a test device to generate system current;
judging whether the tolerance current reaches a preset fourth current threshold value, when the tolerance current reaches the preset fourth current threshold value, turning off the follow current switch, and simultaneously controlling the direct current breaker component to be conducted, wherein the tolerance current forms loop follow current through the direct current breaker component, the isolating switch, the first current limiting reactor and the second current limiting reactor, and the direct current breaker component carries out short-time current tolerance;
when the direct current breaker assembly finishes short-time current tolerance, the follow current switch is switched on again, the tolerant current flows back to the energy storage triggering circuit through the follow current switch, and when the tolerant current reaches zero, the first triggering circuit is controlled to be cut off.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the movable direct current breaker testing device adopted by the invention has the advantages of simple loop, few equipment types, convenience in construction, small occupied area and lower cost, and is suitable for testing and verifying the direct current breaker on a debugging field of the converter station. 2. According to the mobile direct current breaker testing device, all equipment can be arranged in the mobile box body, such as the mobile box body is arranged in a container, so that the transportation of the testing equipment and the field mobile installation are facilitated. Meanwhile, partial equipment, such as a current-limiting reactor, an isolating switch and the like, can utilize primary equipment of the converter station to perform a direct-current breaker test, so that the equipment quantity, the cost and the floor area requirements of a test device are further reduced. 3. The mobile direct current breaker testing device can simultaneously meet the short-time current tolerance, fault current breaking, reclosing and other tests of the direct current breaker under the actual operation working condition, and the short-time current tolerance test of the direct current breaker assembly, and comprehensively meet the field test requirements of the direct current breaker.
Drawings
Fig. 1 is a schematic structural diagram of a mobile dc breaker testing apparatus according to an embodiment of the present invention.
Fig. 2 is one of the schematic structures of the trigger circuit and the freewheel switch in the embodiment of the present invention.
Fig. 3 is a second schematic diagram of the trigger circuit and the freewheel switch according to the embodiment of the present invention.
Fig. 4 is a third schematic structural diagram of the trigger circuit and the freewheel switch in the embodiment of the present invention.
Fig. 5 is one of schematic structural diagrams of the device under test in the embodiment of the present invention.
FIG. 6 is a second schematic structural diagram of a device under test according to an embodiment of the present invention.
Fig. 7 is a schematic flow chart of a control method of a mobile dc breaker testing apparatus according to an embodiment of the present invention.
Fig. 8 is a second schematic flow chart of a control method of the mobile dc breaker testing apparatus according to the embodiment of the present invention.
Description of reference numerals:
1-energy storage trigger circuit; 2-a first current limiting reactor; 3-a second current limiting reactor; 4-an isolating switch; 5-a freewheeling switch; 6-a lightning arrester; 7-the device under test; 1 a-a first tank circuit discharge switch; 1 b-a first tank circuit energy storage capacitor; 1 c-a first trigger loop; 1 d-a second tank circuit discharge switch; 1 e-a second tank circuit storage capacitor; 1 f-a second trigger loop; 1 g-a third energy storage loop discharge switch; 1 h-a third energy storage loop energy storage capacitor; 1 i-a third trigger loop; 7 a-main current branch of the direct current circuit breaker; 7 b-a direct current breaker transfer branch; 7 c-a direct current breaker energy consumption branch; 7 d-a dc breaker assembly; q 1 、Q 2 … -power semiconductor devices; k 1 、K 2 … -mechanical switch; GP 1 、GP 2 … -trigger gap.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
The following description will explain embodiments of the present invention in further detail with reference to the accompanying drawings.
In a first embodiment of the present invention, as shown in fig. 1, this example provides a mobile dc circuit breaker testing apparatus, which includes an energy storage triggering circuit 1, a first current limiting reactor 2, a second current limiting reactor 3, a disconnecting switch 4, a freewheeling switch 5, and a lightning arrester 6. The energy storage trigger circuit 1, the isolating switch 4, the second current limiting reactor 3 and the follow current switch 5 are sequentially connected in series end to end; the first current limiting reactor 2, the tested equipment 7 and the freewheeling switch 5 are connected in series and then connected in parallel at two ends of the energy storage trigger circuit 1; the lightning arrester 6 is connected in parallel with two ends of the freewheeling switch 5.
In the above embodiment, the energy storage triggering circuit 1 includes three sets of energy storage circuits and three sets of triggering circuits, the three sets of energy storage circuits are a first energy storage circuit, a second energy storage circuit and a third energy storage circuit, and the three sets of triggering circuits are a first triggering circuit 1c, a second triggering circuit 1f and a third triggering circuit 1 i. Each group of energy storage circuits and each group of trigger circuits are connected in series to form a trigger branch circuit, and the three trigger branch circuits are connected in parallel.
The three groups of energy storage circuits have the same structure, and take the first energy storage circuit as an example, the first energy storage circuit comprises a first energy storage circuit discharge switch 1a and a first energy storage circuit energy storage capacitor 1 b; the first energy storage loop discharge switch 1a is connected in parallel with two ends of the first energy storage loop energy storage capacitor 1b, and one end of the first energy storage loop energy storage capacitor 1b is connected with the trigger loop. Preferably, the energy storage capacitor is formed by connecting at least one stage of capacitors in series and parallel.
The three groups of trigger circuits have the same structure, and take the first trigger circuit 1c as an example, the first trigger circuit at least comprises one switch, and the switches are sequentially connected in series.
In the above embodiment, the structure of the freewheeling switch 5 is the same as that of the trigger circuit, and each freewheeling switch is formed by connecting a plurality of switches in series.
Preferably, the switches in the trigger circuit and the freewheel switch 5 are power semiconductor devices, several power semiconductor devices (Q) 1 、Q 2 …) in series as shown in fig. 2.
Preferably, the switches in the trigger circuit and the freewheel switch 5 are mechanical switches, several mechanical switches (K) 1 、K 2 …) are connected in series as shown in fig. 3.
Preferably, the switches in the trigger circuit and freewheel switch 5 use trigger gaps, several trigger Gaps (GP) 1 、GP 2 …) are connected in series as shown in fig. 4.
In the above embodiment, the inductance value of the first current limiting reactor 2 is much smaller than the inductance value of the second current limiting reactor 3.
In the above embodiment, the device under test 7 may be a dc breaker or a dc breaker assembly 7 d. When the device under test 7 is a dc circuit breaker, as shown in fig. 5, the dc circuit breaker is formed by connecting a main current branch 7a, a transfer branch 7b, and an energy consumption branch 7c in parallel. When the device under test 7 is a dc circuit breaker assembly 7d, as shown in fig. 6, the dc circuit breaker assembly 7d may be the main current branch 7a, the transfer branch 7b, or the energy consuming branch 7c, or a mechanical switching assembly or a power semiconductor assembly in the main current branch 7a, the transfer branch 7b, or the energy consuming branch 7 c.
In the above embodiment, the energy storage triggering circuit 1, the freewheeling switch 5 and the lightning arrester 6 are all arranged inside the movable box. The first current limiting reactor 2, the second current limiting reactor 3 and the isolating switch 4 are all arranged in a movable box body, or are arranged outside the box body and are located outdoors.
In a second embodiment of the present invention, the present embodiment provides a mobile dc breaker test control method which is performed based on the test apparatus in the first embodiment, and which can realize tests such as short-time current tolerance, fault current breaking and reclosing for a dc breaker, and can realize a short-time current tolerance test for a dc breaker assembly 7 d.
As shown in fig. 7, when tests such as short-time current tolerance, fault current breaking and reclosing are sequentially performed on the dc circuit breaker, the test control method includes the following steps:
step S101, controlling a test device to generate system current;
the method specifically comprises the following steps: the freewheeling switch 5 is in a conducting state, the isolating switch 4 is in a closing state, the direct-current circuit breaker is in a breaking state, then the first trigger loop 1c is controlled to be conducted, and the first energy storage loop energy storage capacitor 1b generates system current through the second current limiting reactor 3;
step S102, judging whether the system current reaches a preset first current threshold value, and carrying out a short-time current tolerance test;
the method specifically comprises the following steps: when the system current reaches a preset first current threshold value, a follow current switch 5 is turned off, and meanwhile, a direct current breaker is switched on, at the moment, the system current forms loop follow current through the direct current breaker, a disconnecting switch 4, a first current limiting reactor 2 and a second current limiting reactor 3, and the direct current breaker carries out short-time current tolerance;
step S103, when the short-time current tolerance of the direct current breaker is completed, the freewheeling switch 5 is turned on again, the system current flows back to the energy storage trigger circuit 1 through the freewheeling switch 5, and when the system current reaches zero, the first trigger circuit 1c is controlled to be cut off, and the isolating switch 4 is separated;
step S104, when the isolating switch 4 reaches the position division, the second trigger circuit is controlled to be conducted 1f, and the second energy storage circuit energy storage capacitor 1e generates fault current through the first current limiting reactor 2;
step S105, judging whether the barrier current reaches a preset second current threshold value, and performing a fault current on-off test;
the method comprises the following specific steps: when the fault current reaches a preset second current threshold value, the main through-current branch 7a of the direct-current circuit breaker is turned off, the current is transferred to the transfer branch 7b, when the current is completely transferred to the transfer branch 7b, the transfer branch 7b is turned off, the current is transferred to the energy consumption branch 7c, the direct-current circuit breaker finishes the on-off of the fault current, and when the fault current reaches zero, the second trigger circuit 1f is controlled to be turned off;
step S106, after preset time delay, controlling the third trigger circuit 1i to be conducted, simultaneously conducting the transfer branch circuit 7b of the direct current breaker, generating fault current again by the third energy storage circuit energy storage capacitor 1h through the first current limiting reactor 2, and simulating the coincidence of the direct current breaker with the fault;
step S107, judging whether the fault current generated again reaches a preset third current threshold value, and performing a reclosing test;
when the fault current generated again reaches a preset third current threshold value, the transfer branch 7b is turned off, the current is transferred to the energy consumption branch 7c, the direct-current circuit breaker completes a reclosing and reclosing test, and when the fault current reaches zero, the third trigger circuit 1i is controlled to be cut off;
and step S108, after preset time delay, the direct current breaker is switched on, and because the second trigger loop 1f and the third trigger loop 1i are not conducted and have no fault current, when the direct current breaker is successfully switched on again, the direct current breaker completes a reclosing test.
As shown in fig. 8, the short-time current tolerance test is performed on the dc breaker assembly 7d, and the test control method includes the following steps:
step S201, controlling a test device to generate system current;
the method comprises the following specific steps: the follow current switch 5 is in a conducting state, the isolating switch 4 is in a closing state, the direct current breaker assembly 7d is in a closing state, then the first trigger circuit 1c is controlled to be conducted, and the first energy storage circuit energy storage capacitor 1b generates withstand current through the second current limiting reactor 3;
step S202, judging whether the tolerance current reaches a preset fourth current threshold value, and carrying out a short-time current tolerance test;
the method specifically comprises the following steps: when the tolerance current reaches a preset fourth current threshold value, the follow current switch 5 is turned off, the direct current breaker assembly 7d is controlled to be switched on, the tolerance current forms loop follow current through the direct current breaker assembly 7d, the isolating switch 4, the first current limiting reactor 2 and the second current limiting reactor 3, and the direct current breaker assembly 7d carries out short-time current tolerance;
step S203, when the dc circuit breaker assembly 7d completes short-time current tolerance, the freewheeling switch 5 is turned on again, the tolerant current flows back to the energy storage trigger circuit through the freewheeling switch 5, and when the tolerant current reaches zero, the first trigger circuit 1c is controlled to be turned off.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Claims (4)
1. A direct current breaker testing device is characterized by comprising an energy storage triggering circuit, a first current limiting reactor, a second current limiting reactor, an isolating switch, a follow current switch and a lightning arrester; the energy storage trigger circuit, the isolating switch, the second current limiting reactor and the follow current switch are sequentially connected in series end to end; the first current limiting reactor, the tested equipment and the follow current switch are connected in series and then connected in parallel at two ends of the energy storage triggering circuit; the lightning arrester is connected in parallel at two ends of the follow current switch; the tested device is a direct current breaker and a direct current breaker assembly; the direct current circuit breaker comprises a main through-current branch, a transfer branch and an energy consumption branch;
the direct-current circuit breaker testing device can simultaneously meet short-time current tolerance, fault current breaking and reclosing tests of the direct-current circuit breaker under the actual operating condition and short-time current tolerance tests of a direct-current circuit breaker assembly, and completely meet the field test requirements of the direct-current circuit breaker;
the energy storage trigger circuits comprise three groups of energy storage circuits and three groups of trigger circuits, wherein the three groups of energy storage circuits are a first energy storage circuit, a second energy storage circuit and a third energy storage circuit, and the three groups of trigger circuits are a first trigger circuit, a second trigger circuit and a third trigger circuit; each group of the energy storage circuits and each group of the trigger circuits are connected in series to form a trigger branch circuit, and the three trigger branch circuits are connected in parallel; each group of energy storage loops comprises a first energy storage loop discharge switch and a first energy storage loop energy storage capacitor; the first energy storage loop discharge switch is connected in parallel with two ends of the first energy storage loop energy storage capacitor, and one end of the first energy storage loop energy storage capacitor is connected with the trigger loop;
carrying out short-time current tolerance, fault current breaking and reclosing tests on the direct-current circuit breaker in sequence, and carrying out short-time current tolerance tests on a direct-current circuit breaker assembly;
carry out short-time current tolerance, fault current breaking and reclosing test to direct current circuit breaker in proper order, include:
controlling the test device to generate system current: the method comprises the steps that a freewheeling switch is in a conducting state, an isolating switch is in a closing state, a direct-current breaker is in a breaking state, then a first trigger loop is controlled to be conducted, and a first energy storage loop energy storage capacitor generates system current through a second current limiting reactor;
judging whether the system current reaches a preset first current threshold value or not, and carrying out a short-time current tolerance test: when the system current reaches a preset first current threshold value, a follow current switch is turned off, and meanwhile, a direct current breaker is switched on, at the moment, the system current forms loop follow current through the direct current breaker, a disconnecting switch, a first current-limiting reactor and a second current-limiting reactor, and the direct current breaker carries out short-time current tolerance;
when the direct current breaker finishes short-term current tolerance, the freewheeling switch is switched on again, the system current flows back to the energy storage trigger circuit through the freewheeling switch, and when the system current reaches zero, the first trigger circuit is controlled to be switched off and the isolating switch is separated;
when the isolating switch reaches the sub-position, the second trigger circuit is controlled to be conducted, and the energy storage capacitor of the second energy storage circuit generates fault current through the first current limiting reactor;
judging whether the fault current reaches a preset second current threshold value, and performing a fault current on-off test: when the fault current reaches a preset second current threshold value, the main through-current branch of the direct-current circuit breaker is turned off, the current is transferred to the transfer branch, when the current is completely transferred to the transfer branch, the transfer branch is turned off, the current is transferred to the energy consumption branch, the direct-current circuit breaker finishes the on-off of the fault current, and when the fault current reaches zero, the second trigger circuit is controlled to be turned off;
after the preset time delay, controlling a third trigger circuit to be conducted, simultaneously conducting a transfer branch of the direct current circuit breaker, and simulating the coincidence of the direct current circuit breaker and the fault by the fault current generated again by an energy storage capacitor of a third energy storage circuit through a first current limiting reactor;
judging whether the fault current generated again reaches a preset third current threshold value, and performing a reclosing test: when the fault current generated again reaches a preset third current threshold value, the transfer branch is switched off, the current is transferred to the energy consumption branch, the direct current breaker completes a reclosing and reclosing test, and when the fault current reaches zero, a third trigger circuit is controlled to be cut off;
after the preset time delay, the direct current breaker is switched on, and when the direct current breaker is successfully switched on again, the direct current breaker completes the reclosing test;
the short-time current tolerance test on the direct current breaker assembly is as follows:
the method comprises the steps that a freewheeling switch is in a conducting state, an isolating switch is in a closing state, a direct current breaker assembly is in a closing state, then a first trigger circuit is controlled to be conducted, and a first energy storage circuit energy storage capacitor generates withstand current through a second current limiting reactor;
when the tolerance current reaches a preset fourth current threshold value, the follow current switch is turned off, the direct current breaker assembly is turned on, the tolerance current forms loop follow current through the direct current breaker assembly, the isolating switch, the first current limiting reactor and the second current limiting reactor, and the direct current breaker assembly carries out short-time current tolerance;
when the direct current breaker assembly finishes short-time current tolerance, the follow current switch is switched on again, the tolerant current flows back to the energy storage triggering circuit through the follow current switch, and when the tolerant current reaches zero, the first triggering circuit is controlled to be cut off.
2. The test device of claim 1, wherein each set of said trigger circuit and said freewheel switch are identical in construction and each include at least one switch, each of said switches being serially connected in sequence.
3. The test device of claim 2, wherein the switch is a power semiconductor device, a mechanical switch, or a trigger gap.
4. The test apparatus of claim 1, wherein an inductance value of the first current limiting reactor is much smaller than an inductance value of the second current limiting reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110823766.XA CN113552477B (en) | 2021-07-21 | 2021-07-21 | Direct current breaker testing device and control method |
Applications Claiming Priority (1)
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| CN105807214B (en) * | 2014-12-29 | 2019-08-27 | 国家电网公司 | A kind of high voltage DC breaker breaking test apparatus and its test method |
| CN105807216A (en) * | 2014-12-29 | 2016-07-27 | 国家电网公司 | Testing device of high voltage direct current circuit breaker full bridge module and testing method thereof |
| CN108957303B (en) * | 2017-05-26 | 2020-08-25 | 许继电气股份有限公司 | High-voltage direct-current breaker current tolerance test loop and method |
| CN107728048B (en) * | 2017-09-05 | 2020-02-21 | 许继电气股份有限公司 | Mixed type high-voltage direct-current circuit breaker testing system |
| CN109031105A (en) * | 2018-06-12 | 2018-12-18 | 江苏启源雷宇电气科技有限公司 | A kind of dc circuit breaker electric current cut-offs experiment porch |
| CN111398804A (en) * | 2020-04-15 | 2020-07-10 | 山东泰开高压开关有限公司 | Equivalent on-off test device and method for direct current circuit breaker |
| CN212723223U (en) * | 2020-06-04 | 2021-03-16 | 北京电力设备总厂有限公司 | Test loop for short-time current tolerance test of main branch of direct current breaker |
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