CN212723223U - Test loop for short-time current tolerance test of main branch of direct current breaker - Google Patents
Test loop for short-time current tolerance test of main branch of direct current breaker Download PDFInfo
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- CN212723223U CN212723223U CN202021011140.6U CN202021011140U CN212723223U CN 212723223 U CN212723223 U CN 212723223U CN 202021011140 U CN202021011140 U CN 202021011140U CN 212723223 U CN212723223 U CN 212723223U
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Abstract
The utility model discloses a test circuit that is used for direct current breaker main tributary short-term electric current to tolerate experiment, it includes: with the parallelly connected overload direct current that applys to direct current breaker main tributary branch and be greater than the first proportion overload direct current that sets for of rated current tolerance test module, in setting for the millisecond to direct current breaker main tributary branch applys the short-time current that is greater than the second proportion short-time current that sets for of rated current tolerance test module, overload direct current tolerance test module includes: the output end of the rectifying device is connected with a main branch of the direct-current circuit breaker in parallel; the short-time current tolerance test module comprises: the direct current charging power supply, the charging capacitor, the discharging resistor and the reactor are connected in parallel and then connected in series with the reactor. The beneficial effects of the utility model reside in that, can accomplish the experiment in two stages in one set of experimental return circuit to parameter control range is wide, and test efficiency is high.
Description
Technical Field
The utility model relates to a direct current breaker technical field especially relates to a test equipment that is used for direct current breaker main tributary short-term electric current to tolerate test.
Background
A dc circuit breaker is one of the core devices of a dc power grid. In a direct current system, as a main protection device, a direct current breaker needs to complete the disconnection of fault current within milliseconds, and the isolation and the superposition of a fault line are quickly and reliably realized. The direct current circuit breaker aims at ensuring safe and continuous operation of a sound system and improving the reliability of a direct current power grid. In addition, the direct current circuit breaker should have live switching ability to realize that the converter station is put on or off in the direct current electric wire netting in a flexible way. Therefore, the dc circuit breaker is a key device for ensuring safe, reliable and continuous operation of the dc power grid.
Prior art document 1 (honor philosophy et al, a high voltage hybrid dc circuit breaker [ P ].
CN103219699A,2013-07-24.) and prior art document 2 (sabno supercalence. hybrid high voltage dc circuit breaker research status overview [ J ] high voltage electrical appliance, 2019,55(09):64-70.) all disclose a topology structure of a hybrid dc circuit breaker, which utilizes an internal commutation of a main branch, a transfer branch and an energy consumption branch which are connected in parallel under a certain time sequence to realize dc breaking, wherein the main branch is formed by connecting a fast mechanical switch and a main load valve group in series and is used for conducting the current of a dc system.
The main circuit short-time current tolerance test is mainly used for verifying the short-time current tolerance of a power electronic module and a quick mechanical switch of a main circuit of the direct-current circuit breaker. The test is divided into two stages, wherein the first stage is that the main branch is injected with overload direct current with the duration time required by technical specifications; the second phase injects the short duration withstand current required by the specification for the main branch.
Prior art document 3(Belda N a, mice R P. test circuits for HVDC circuit breakers [ J ]. IEEE Transactions on Power Delivery,2016,32(1): 285-.
Therefore, it is necessary to design a test loop that meets the requirements of the short-time current endurance test of the main branch, and the test can be completed in two stages in one set of test loop.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a main tributary way short-term electric current tolerance test's test return circuit for direct current circuit breaker can accomplish the experiment in two stages in one set of test return circuit.
The technical scheme of the utility model is that: a test loop for short-time current tolerance test of a main branch of a direct current circuit breaker comprises: the overload direct current tolerance test system comprises an overload direct current tolerance test module, an isolating switch and a closing switch, wherein the overload direct current tolerance test module applies overload direct current larger than rated current at a first set proportion to a main branch of a direct current breaker, and applies short-time current larger than rated current at a second set proportion to the main branch of the direct current breaker within set milliseconds; the short-time current tolerance test module is connected with a main branch of the direct-current circuit breaker in parallel, one end of the closing switch is connected with the short-time current tolerance test module, and the other end of the closing switch is connected with the main branch of the direct-current circuit breaker.
Further, the overload direct current endurance test module comprises an alternating current power supply and a rectifying device, and the output end of the rectifying device is connected with the main branch of the direct current circuit breaker in parallel.
Further, the short-time current tolerance test module comprises: the direct current charging power supply, the charging capacitor, the discharging resistor and the reactor are connected in parallel and then connected in series with the reactor.
Further, the short-time current tolerance test module further comprises a discharge switch, and the discharge switch is connected in series with the discharge resistor and then connected in parallel with the direct-current charging power supply.
Furthermore, the short-time current tolerance test module further comprises a charging switch, and the charging switch is connected in series with the charging capacitor and then connected in parallel with the direct-current charging power supply.
The beneficial effects of the utility model reside in that, compare with prior art, can accomplish the experiment in two stages in one set of experimental return circuit to parameter control range is wide, and test efficiency is high.
Drawings
Fig. 1 is the utility model discloses a topological structure of a test loop for direct current breaker main tributary way electric current tolerates experiment.
In the figure: k1-isolating switch; k2-closing switch; k3-discharge switch; k4-charge switch; an L-reactor; r-a discharge resistor; c-a charge capacitor; a DC-DC charging power supply.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, a preferred embodiment of the present invention provides a test loop for short-time current tolerance test of a main branch of a dc circuit breaker, including: the overload direct current endurance test system comprises an overload direct current endurance test module, a short-time current endurance test module, an isolating switch K1 and a closing switch K2.
The overload direct current tolerance test module is connected with a main branch of the direct current circuit breaker in parallel, one end of the isolating switch K1 is connected with the overload direct current tolerance test module, the other end of the isolating switch K1 is connected with the main branch of the direct current circuit breaker, rated current flows through the main branch of the direct current circuit breaker when the main branch of the direct current circuit breaker normally works, and overload direct current greater than the first set proportion of the rated current is applied to the main branch of the direct current circuit breaker by the overload direct current tolerance test module during testing. The overload direct current is the product of rated current, overload direct current tolerance test coefficient and redundancy coefficient.
The short-time current tolerance test module is connected with a main branch of the direct-current circuit breaker in parallel, one end of a closing switch K2 is connected with the short-time current tolerance test module, the other end of the closing switch K2 is connected with the main branch of the direct-current circuit breaker, rated current flows through the main branch of the direct-current circuit breaker when the main branch of the direct-current circuit breaker normally works, during test, the short-time current tolerance test module applies short-time current which is larger than the second set proportion of the rated current to the main branch of the direct-current circuit breaker within 10 milliseconds, and the short-time current is the product of the rated current, a short-time. The principle of the test is to achieve the equivalence of energy and junction temperature. The time interval between the first and second phases of the experiment is determined by calculation. The technical meaning of "short-term" in the present invention means that the short-circuit current rise time (1/4 cycles) reaches the current peak value within typically 10 ms.
Further, the overload direct current tolerance test module comprises an alternating current power supply and a rectifying device, and the output of the rectifying device is overload direct current for testing.
Further, the short-time current tolerance test module comprises: the device comprises a direct current charging power supply DC, a charging capacitor C, a discharging resistor R and a reactor L. The direct current charging power supply DC, the charging capacitor C and the discharging resistor R are connected in parallel and then connected in series with the reactor L. The short-time current tolerance test module generates currents similar to faults in a mode that the charging capacitor C discharges to the reactor L, and mainly utilizes the quarter-cycle time of the LC oscillation current rising stage.
The short-time current tolerance test module further comprises a charging and discharging switch K3, and the discharging switch K3 is connected with the discharging resistor R in series and then connected with the direct-current charging power supply DC in parallel.
The short-time current tolerance test module further comprises a charging switch K4, and the charging switch K4 is connected with the charging capacitor C in series and then connected with the direct-current charging power supply DC in parallel.
The reactor L is a fixed reactor or an adjustable reactor, the charging capacitor C is a fixed capacitor or an adjustable capacitor, and the reactor L, the charging capacitor C and the DC charging power supply DC parameter are selected to realize the adjustment of the short-time current applied to the main circuit of the DC circuit breaker.
Adopt the utility model discloses a carry out direct current breaker main tributary short-term electric current endurance test and include following step:
step 1, before the test, the isolating switch K1 and the charging switch K4 are in a closing state, the closing switch K2 and the discharging switch K3 are in an opening state, and a main branch of the direct current circuit breaker is in a conducting state.
And 2, carrying out an overload direct current tolerance test, starting a rectifying device, applying overload direct current to the main branch of the direct current breaker, and opening the isolating switch K1 after the overload direct current applied to the main branch of the direct current breaker meets the required time. Meanwhile, the direct current charging power supply DC is started to charge the charging capacitor C to a specified voltage, and then the charging switch K4 is switched off.
And 3, performing a short-time current tolerance test, discharging a switch K2 and a charging capacitor C through a reactor L, and applying short-time tolerance current to a main branch of the direct current breaker. After the test, the discharge switch K3 is closed, and the residual charge is discharged through the discharge resistor R.
The beneficial effects of the utility model reside in that, compare with prior art, can accomplish the experiment in two stages in one set of experimental return circuit to parameter control range is wide, and test efficiency is high.
Through the test process steps, the main branch current tolerance test of the direct current circuit breaker can be completed once.
The applicant of the present invention has made detailed description and description of the embodiments of the present invention with reference to the drawings, but those skilled in the art should understand that the above embodiments are only the preferred embodiments of the present invention, and the detailed description is only for helping the reader to better understand the spirit of the present invention, and not for the limitation of the protection scope of the present invention, on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the protection scope of the present invention.
Claims (5)
1. A test loop for short-time current tolerance test of a main branch of a direct current circuit breaker comprises: the overload direct current that is greater than the first proportion overload direct current that sets for of rated current is applyed to direct current breaker main branch and is endured test module, is greater than the short-time current of rated current second proportion that sets for short-time current and tolerates test module, isolator (K1) and closing switch (K2) to direct current breaker main branch within setting for the millisecond, its characterized in that:
the overload direct current tolerance test module is connected with a main branch of the direct current circuit breaker in parallel, one end of a disconnecting switch (K1) is connected with the overload direct current tolerance test module, and the other end of the disconnecting switch is connected with the main branch of the direct current circuit breaker;
the short-time current tolerance test module is connected with a main branch of the direct-current circuit breaker in parallel, one end of a closing switch (K2) is connected with the short-time current tolerance test module, and the other end of the closing switch is connected with the main branch of the direct-current circuit breaker.
2. Test circuit for short-time current withstand test of a main branch of a dc circuit breaker according to claim 1, characterized in that:
the overload direct current tolerance test module comprises an alternating current power supply and a rectifying device, and the output end of the rectifying device is connected with a main branch of the direct current breaker in parallel.
3. Test circuit for short-time current withstand test of a main branch of a dc circuit breaker according to claim 1, characterized in that:
the short-time current tolerance test module comprises: the direct current charging power supply (DC), the charging capacitor (C), the discharging resistor (R) and the reactor (L) are connected in parallel and then connected in series with the reactor (L).
4. Test circuit for short-time current withstand test of a main branch of a dc circuit breaker according to any of claims 1 to 3, characterized in that:
the short-time current tolerance test module further comprises a discharge switch (K3), and the discharge switch (K3) is connected with the discharge resistor (R) in series and then connected with the direct-current charging power supply (DC) in parallel.
5. A test circuit for short-time current endurance test of main branch of DC circuit breaker according to claim 4, characterized in that:
the short-time current tolerance test module further comprises a charging switch (K4), and the charging switch (K4) is connected with the charging capacitor (C) in series and then connected with the direct current charging power supply (DC) in parallel.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113552477A (en) * | 2021-07-21 | 2021-10-26 | 国网经济技术研究院有限公司 | Direct current breaker testing device and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552477A (en) * | 2021-07-21 | 2021-10-26 | 国网经济技术研究院有限公司 | Direct current breaker testing device and control method |
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