CN105807214A - Breaking test device and test method for high-voltage direct current breaker - Google Patents
Breaking test device and test method for high-voltage direct current breaker Download PDFInfo
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- CN105807214A CN105807214A CN201410838440.4A CN201410838440A CN105807214A CN 105807214 A CN105807214 A CN 105807214A CN 201410838440 A CN201410838440 A CN 201410838440A CN 105807214 A CN105807214 A CN 105807214A
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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
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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
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- Arc-Extinguishing Devices That Are Switches (AREA)
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention relates to a breaking test device and test method for a high-voltage direct current breaker. A reactor L of the device is connected in series with the high-voltage direct current breaker and then separately connected in parallel with a high-voltage circuit and a low-voltage circuit; a bypass switch is connected in parallel to two ends of the high-voltage direct current breaker; and a protection thyristor is connected in parallel to two ends of a full-bridge module in a mechanical switch-full-bridge module branch. In the test method, rated current from a low-voltage high-current source is injected to the breaker via a thyristor isolating valve; a capacitor is charged by a high-voltage low-current source, initial test voltage is established, the high-voltage circuit is discontinuously triggered by spark, the test current is adjusted by the reactor and then injected into the breaker, the thyristor isolating valve is switched off, breaking is accomplished when the expected breaking current or the maximum breaking time arrives, and the breaker tolerates transient recovery overvoltage and residual voltage of the capacitor in the high-voltage circuit. The device and the method can reproduce current, voltage and thermal stress of the high-voltage direct current breaker in practical operation, are high in test equivalence, and have the capability of reliably detecting the breaking performance of the breaker.
Description
Technical field
The present invention relates to the assay device of a kind of dc circuit breaker and test method thereof, in particular to a kind of high voltage DC breaker breaking test apparatus and test method thereof.
Background technology
Along with starting application based on the multiterminal flexible direct current of voltage source converter (VSC) and direct current network technology, quick high-pressure dc circuit breaker becomes one of key equipment of guarantee system stability safe and reliable operation, its reliability of operation directly determines safety and the economy of institute's configuring direct current system, it is thus desirable to carry out comprehensive testing inspection high voltage DC breaker performance, and chopper breaking capacity is one of most important performance.High voltage DC breaker still belongs to field of power electronics cutting edge technology, and only ABB and ALSTOM Liang Jia transnational enterprise completes the development of high voltage DC breaker model machine at present, and its test method belongs to highly confidential technology, rare bibliographical information.And ripe HVDC converts switch test and adopts single supply test method, it is possible to complete big electric current disjunction, but cannot restoring over-voltage after thermal stress and disjunction in effectively equivalent chopper breaking course, and poor universality.
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to provide a kind of high voltage DC breaker breaking test apparatus and test method thereof, assay device topological structure provided by the invention is simple, controlling simplicity, capacity of experiment is low, test current is big, and breaking current amplitude and di/dt are adjustable flexibly, high voltage DC breaker electric current in actual motion, voltage and thermal stress can be reappeared, test equivalence is high, high safety, possesses the reliable ability detecting high voltage DC breaker interrupting performance.
It is an object of the invention to adopt following technical proposals to realize:
The present invention provides a kind of high voltage DC breaker breaking test apparatus, and described high voltage DC breaker includes the mechanical switch-full-bridge modules unit branch road of parallel connection, full-bridge modules unit branch road and spark gap MOV；Described mechanical switch-full-bridge modules unit props up route mechanical switch K and is composed in series with full-bridge modules unit；Described full-bridge modules unit props up the full-bridge modules unit composition of route series connection；It thes improvement is that, described assay device includes high tension loop, low tension loop, reactor L and high voltage DC breaker；Described reactor L and high voltage DC breaker are in parallel with high tension loop and low tension loop respectively after connecting；Described high voltage DC breaker two ends are parallel with by-pass switch；In described high voltage DC breaker mechanical switch-full-bridge modules branch road, full-bridge modules two ends are parallel with protection IGCT.
Further, described high tension loop includes high voltage-small current source (0～30kV, 0～2A), spark gap, capacitor C2 and subsidiary loop thereof and diode valve；The described positive pole in high voltage-small current source is connected with one end of spark gap；The minus earth in described high voltage-small current source；One end of negative electrode and reactor L that the other end of described spark gap isolates thyristor valve with low tension loop is connected；Described capacitor C2 and diode valve are in parallel with high voltage-small current source after connecting；The subsidiary loop of capacitor C2 includes mechanical switch K1, K2 and resistance R；Described subsidiary loop is connected in parallel in capacitor C2 two ends；Connect with mechanical switch K1 after described resistance R and mechanical switch K2 parallel connection.
Further, described low tension loop includes the low-tension supply of series connection, reactor L1 and isolation thyristor valve；Described low tension loop can create the rated current that amplitude is 1～6kA.
Further, the two ends inverse parallel of described protection IGCT has diode；Described full-bridge modules unit is made up of biphase four bridge legs, and is parallel with capacitor C between the two phases, is parallel with resistance at capacitor C two ends；Each brachium pontis is made up of IGBT and fly-wheel diode antiparallel with it.
The present invention also provides for the test method of a kind of high voltage DC breaker breaking test apparatus, and it thes improvement is that, described method comprises the steps:
Before A, test, making the mechanical switch K of high voltage DC breaker be in closure state, all of IGBT is in the conduction state for full-bridge modules unit, and by-pass switch is in disjunction state, and completes high-potting tank capacitance is charged by high voltage-small current source；
B, low tension loop trigger isolation thyristor valve, and inject rated current by isolating thyristor valve to high voltage DC breaker；
C, after high voltage DC breaker reaches thermal balance, high tension loop is introduced by pilot spark gap, control to inject high voltage DC breaker electric current di/dt through reactor L, high tension loop injection current will turn off after forced quarantines thyristor current flows zero passage simultaneously, it is achieved the isolation of high tension loop and low tension loop；
D, high tension loop injection current reach high voltage DC breaker maximum breaking current or reach high voltage DC breaker allow maximum break time; high voltage DC breaker disjunction; by adjusting tolerance protection of arrester horizontal voltage and high tension loop electric capacity C2 residual voltage, it is achieved with the equivalence of Practical Project breaking current and restoring over-voltage；
E, tested after, successively mechanical switch K1 and K2 in the subsidiary loop of closed high tank capacitors C2, it is achieved releasing of condenser voltage.
The present invention also provides for the test method of a kind of high voltage DC breaker breaking test apparatus, it thes improvement is that, before carrying out disjunction test, high voltage DC breaker is made to be in disjunction state, Guan Bi by-pass switch, trigger low-voltage loop isolation thyristor valve, triggers high tension loop spark gap subsequently again, completes expection test current test.
The present invention also provides for the test method of a kind of high voltage DC breaker breaking test apparatus, it thes improvement is that, utilize low tension loop, regulate its output voltage and low tension loop reactor L1, carry out the specified through-current capability of high voltage DC breaker and sort time overcurrent ability test.
Compared with immediate prior art, the excellent effect that technical scheme provided by the invention has is:
1, the carried high voltage DC breaker disjunction test method of the present invention adopts double source complex method, required capacity of experiment is low, test current is big and di/dt is adjustable flexibly, and test capability can cover the high voltage DC breaker being applied in flexible direct current and Traditional DC power transmission engineering；
2, the present invention carried high voltage DC breaker disjunction hookup simple in construction, controls simple and easy, and test platform construction cost is low；
3, the carried high voltage DC breaker disjunction test method of the present invention can accurately reappear dc circuit breaker and experiences thermal stress under different faults type, breaking current, transient overvoltage (comprising DC voltage) under nominal operating conditions, and possesses superior equivalence；
4, the present invention carried high voltage DC breaker disjunction test method complete function, additionally it is possible to complete high voltage DC breaker temperature rise test and sort time overcurrent test, possess high integration；
5, the present invention carried novel high-pressure dc circuit breaker disjunction test method can testing experiment prospective current, and provide perfect protective measure, both provided the safety of test, again can visual verification dc circuit breaker disjunction effect.
Accompanying drawing explanation
Fig. 1 is high voltage DC breaker structure chart provided by the invention；Wherein (a) is high-voltage direct-current breaker topology figure, and (b) is the topology diagram of full-bridge modules assay device；
Fig. 2 is high voltage DC breaker breaking test apparatus topology diagram provided by the invention；
Fig. 3 is control sequential and the disjunction oscillogram of high voltage DC breaker disjunction provided by the invention test.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is high-voltage direct-current breaker topology, a () is high-voltage direct-current breaker topology figure, b () is the topology diagram of full-bridge modules assay device, high voltage DC breaker includes the mechanical switch-full-bridge modules unit branch road of parallel connection, full-bridge modules unit branch road and spark gap MOV；Described mechanical switch-full-bridge modules unit props up route mechanical switch K and is composed in series with full-bridge modules unit；Described full-bridge modules unit props up the full-bridge modules unit composition of route series connection；Full-bridge modules unit is made up of biphase four bridge legs, and is parallel with capacitor C between the two phases, is parallel with resistance at capacitor C two ends；Each brachium pontis is made up of IGBT and fly-wheel diode antiparallel with it.
The topology diagram of high voltage DC breaker breaking test apparatus provided by the invention is as in figure 2 it is shown, include high tension loop, low tension loop, reactor L and high voltage DC breaker；Described reactor L and high voltage DC breaker are in parallel with high tension loop and low tension loop respectively after connecting；Described high voltage DC breaker two ends are parallel with by-pass switch；In described high voltage DC breaker mechanical switch-full-bridge modules branch road, full-bridge modules two ends are parallel with protection IGCT.By-pass switch is for testing the injection current waveform of whole hookup before the test, it is ensured that the safety of test, may be provided for normal fault waveform and chopper disjunction waveform comparison simultaneously, verifies dc circuit breaker disjunction effect.It is provided protection when chopper cannot complete normal disjunction by bypass IGCT; two ends anti-paralleled diode makes it will not tolerate the backward voltage that high tension loop vibration is formed; all being tolerated by with the electric capacity C2 diode valve connected, it is without to carry out multiple Thyristors in series.
High tension loop includes high voltage-small current source (0～30kV, 0～2A), spark gap, capacitor C2 and subsidiary loop thereof and diode valve；The described positive pole in high voltage-small current source is connected with one end of spark gap；The minus earth in described high voltage-small current source；One end of negative electrode and reactor L that the other end of described spark gap isolates thyristor valve with low tension loop is connected；Described capacitor C2 and diode valve are in parallel with high voltage-small current source after connecting；The subsidiary loop of capacitor C2 includes mechanical switch K1, K2 and resistance R；Described subsidiary loop is connected in parallel in capacitor C2 two ends；Connect with mechanical switch K1 after described resistance R and mechanical switch K2 parallel connection.The effect of high tension loop is to inject tolerance DC voltage after dc circuit breaker breaking current and disjunction complete.
Low tension loop includes the low-tension supply of series connection, reactor L1 and isolation thyristor valve；Described low tension loop can create the rated current that amplitude is 1～6kA.The effect of low tension loop is to inject dc circuit breaker rated current.
The present invention also provides for a kind of high voltage DC breaker disjunction test method, it is possible to realize the test of big electric current disjunction and the tolerance of high transient overvoltage under the specified running status of novel high-pressure dc circuit breaker.The method injects rated current through isolation thyristor valve to high voltage DC breaker by low-voltage, high-current source；By high voltage-small current source to high-voltage capacitor charging, set up high-potting loop initial trial voltage, high tension loop is triggered subsequently by spark gap, test current injects in high voltage DC breaker after reactance regulates, meanwhile realize low pressure test (LPT) loop isolation thyristor valve to turn off, when reaching prospective breaking current or maximum break, completing disjunction, high voltage DC breaker tolerates transient recovery overvoltage and high-potting tank capacitance residual voltage.Hookup topological structure is simple, control simplicity, capacity of experiment is low, test current is big, breaking current amplitude and di/dt are adjustable flexibly, high voltage DC breaker electric current in actual motion, voltage and thermal stress can be reappeared, test equivalence is high, high safety, possesses the reliable ability detecting high voltage DC breaker interrupting performance.The method specifically includes following step:
Before A, test so that high voltage DC breaker mechanical switch is in closure state, and all full-bridge modules unit based on IGBT are in the conduction state, by-pass switch is in disjunction state, and completes high-potting tank capacitance is charged by high voltage-small current source.
B, low tension loop creation amplitude are thousands of peace rated current, namely the through-flow demand of ripe IGBT device in the market can be met, the approximately constant of rated current is realized by reactance L1 and L, impedance loop is low, making required test voltage extremely low, namely this voltage is capable of the triggering of isolation thyristor valve can meet requirement；Rated current a period of time tn is injected by isolating thyristor valve to high voltage DC breaker in low tension loop；
C, after high voltage DC breaker reaches thermal balance, high-potting loop is introduced by pilot spark gap, control to inject dc circuit breaker electric current di/dt through reactor L, meanwhile high tension loop injection current turns off after forced quarantines thyristor current flows zero passage, it is achieved the isolation of high tension loop and low tension loop.
D, high tension loop injection current reach chopper maximum breaking current or reach chopper allow maximum break time; high voltage DC breaker disjunction; protection of arrester horizontal voltage and high tension loop electric capacity C2 residual voltage will be tolerated; by adjusting the two voltage magnitude, it is possible to achieve with Practical Project breaking current and restoring over-voltage complete equivalence.
E, tested after, successively closed high tank capacitance C2 subsidiary loop mechanical switch K1 and K2, it is achieved releasing of capacitance voltage.
Before carrying out disjunction test, high voltage DC breaker is kept to be in disjunction state, Guan Bi by-pass switch, trigger low-voltage loop isolation thyristor valve, trigger high tension loop spark gap subsequently, can complete to expection test current test, can guarantee test safety, again be provided that expection test current waveform.Additionally, utilize low tension loop, regulate its output voltage and loop reactances, it is also possible to individually carry out the test of the specified through-current capability of dc circuit breaker and sort time overcurrent ability.
The control sequential of high voltage DC breaker disjunction test and disjunction waveform are as shown in Figure 3, T0 is the isolation thyristor valve trigger moment, run time tn chopper with rated current and reach thermal equilibrium state, high tension loop spark gap is triggered at moment T1, dc circuit breaker is with maximum allowable break tbreak or maximum breaking current Imax for signal, disjunction order is sent in the T2 moment, now tolerance chopper spark gap ripple level of protection voltage Umov, after tclear checkout time, chopper tolerance electric capacity residual voltage, this voltage is consistent with chopper application system rated voltage Un, tolerate after this voltage a period of time in the T3 moment, Guan Bi electric capacity C2 subsidiary loop mechanical switch K1 and K2, electric capacity of releasing powers on pressure.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit; although the present invention being described in detail with reference to above-described embodiment; the specific embodiment of the present invention still can be modified or equivalent replacement by those of ordinary skill in the field; these are without departing from any amendment of spirit and scope of the invention or equivalent replace, within the claims of the present invention all awaited the reply in application.
Claims (7)
1. a high voltage DC breaker breaking test apparatus, described high voltage DC breaker includes the mechanical switch-full-bridge modules unit branch road of parallel connection, full-bridge modules unit branch road and spark gap MOV；Described mechanical switch-full-bridge modules unit props up route mechanical switch K and is composed in series with full-bridge modules unit；Described full-bridge modules unit props up the full-bridge modules unit composition of route series connection；It is characterized in that, described assay device includes high tension loop, low tension loop, reactor L and high voltage DC breaker；Described reactor L and high voltage DC breaker are in parallel with high tension loop and low tension loop respectively after connecting；Described high voltage DC breaker two ends are parallel with by-pass switch；Full-bridge modules unit two ends in described high voltage DC breaker mechanical switch-full-bridge modules branch road are parallel with protection IGCT.
2. assay device as claimed in claim 1, it is characterised in that described high tension loop includes high voltage-small current source, spark gap, capacitor C2 and subsidiary loop thereof and diode valve；The described positive pole in high voltage-small current source is connected with one end of spark gap；The minus earth in described high voltage-small current source；One end of negative electrode and reactor L that the other end of described spark gap isolates thyristor valve with low tension loop is connected；Described capacitor C2 and diode valve are in parallel with high voltage-small current source after connecting；The subsidiary loop of capacitor C2 includes mechanical switch K1, K2 and resistance R；Described subsidiary loop is connected in parallel in capacitor C2 two ends；Connect with mechanical switch K1 after described resistance R and mechanical switch K2 parallel connection.
3. assay device as claimed in claim 1, it is characterised in that described low tension loop includes the low-tension supply of series connection, reactor L1 and isolation thyristor valve；Described low tension loop can create the rated current that amplitude is 1～6kA.
4. assay device as claimed in claim 1, it is characterised in that the two ends inverse parallel of described protection IGCT has diode；Described full-bridge modules unit is made up of biphase four bridge legs, and is parallel with capacitor C between the two phases, is parallel with resistance at capacitor C two ends；Each brachium pontis is made up of IGBT and fly-wheel diode antiparallel with it.
5. the test method of the high voltage DC breaker breaking test apparatus as according to any one of claim 1-4, it is characterised in that described method comprises the steps:
Before A, test, making the mechanical switch K of high voltage DC breaker be in closure state, all of IGBT is in the conduction state for full-bridge modules unit, and by-pass switch is in disjunction state, and completes high-potting tank capacitance is charged by high voltage-small current source；
B, low tension loop trigger isolation thyristor valve, and inject rated current by isolating thyristor valve to high voltage DC breaker；
C, after high voltage DC breaker reaches thermal balance, high tension loop is introduced by pilot spark gap, control to inject high voltage DC breaker electric current di/dt through reactor L, high tension loop injection current will turn off after forced quarantines thyristor current flows zero passage simultaneously, it is achieved the isolation of high tension loop and low tension loop；
D, high tension loop injection current reach high voltage DC breaker maximum breaking current or reach high voltage DC breaker allow maximum break time; high voltage DC breaker disjunction; by adjusting tolerance protection of arrester horizontal voltage and high tension loop electric capacity C2 residual voltage, it is achieved with the equivalence of Practical Project breaking current and restoring over-voltage；
E, tested after, successively mechanical switch K1 and K2 in the subsidiary loop of closed high tank capacitors C2, it is achieved releasing of condenser voltage.
6. the test method of a high voltage DC breaker breaking test apparatus as claimed in claim 5, it is characterized in that, before carrying out disjunction test, high voltage DC breaker is made to be in disjunction state, Guan Bi by-pass switch, trigger low-voltage loop isolation thyristor valve, triggers high tension loop spark gap subsequently again, completes expection test current test.
7. the test method of a high voltage DC breaker breaking test apparatus as claimed in claim 5, it is characterized in that, utilize low tension loop, regulate its output voltage and low tension loop reactor L1, carry out the specified through-current capability of high voltage DC breaker and sort time overcurrent ability test.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410838440.4A CN105807214B (en) | 2014-12-29 | 2014-12-29 | A kind of high voltage DC breaker breaking test apparatus and its test method |
| PCT/CN2015/099152 WO2016107509A1 (en) | 2014-12-29 | 2015-12-28 | Breaking testing device for high-voltage direct-current circuit breaker, and testing method therefor |
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| CN201410838440.4A CN105807214B (en) | 2014-12-29 | 2014-12-29 | A kind of high voltage DC breaker breaking test apparatus and its test method |
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