CN111796181A - Test device and test method for high-voltage direct-current circuit breaker operation test - Google Patents
Test device and test method for high-voltage direct-current circuit breaker operation test Download PDFInfo
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- CN111796181A CN111796181A CN202010649380.7A CN202010649380A CN111796181A CN 111796181 A CN111796181 A CN 111796181A CN 202010649380 A CN202010649380 A CN 202010649380A CN 111796181 A CN111796181 A CN 111796181A
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- 238000012360 testing method Methods 0.000 title claims abstract description 224
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- 238000007599 discharging Methods 0.000 claims abstract description 48
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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Abstract
The invention discloses a test device for an operation test of a high-voltage direct-current circuit breaker, which comprises: the direct-current charging circuit comprises a direct-current charging power supply DC, a first T-shaped circuit module, a second T-shaped circuit module, a discharging circuit module and an acquisition module, wherein the left sides of the first T-shaped circuit module and the second T-shaped circuit module are connected with the direct-current charging power supply DC, the right sides of the first T-shaped circuit module and the second T-shaped circuit module are connected with a discharging circuit module and a direct-current breaker test article, the direct-current charging power supply DC is used for charging the first T-shaped circuit module and the second T-shaped circuit module, and the first T-shaped circuit module and the second T-shaped circuit module are used for discharging to the direct-current breaker test article to; the discharge circuit module is used for discharging residual charges; the acquisition module is used for acquiring data of the test device and the DC circuit breaker test article. The two groups of test loops are not affected with each other, the parameters are adjusted flexibly, the vacuum circuit breaker is used as a charging and closing switch, the cost is low, the problem of reverse withstand voltage of the isolating valve is not required to be considered, the equipment reliability is higher, and the damage is not easy.
Description
Technical Field
The invention belongs to the technical field of direct current breaker tests, and particularly relates to a test device and a test method for a high-voltage direct current breaker operation 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.
The working principle and the operating condition of the high-voltage direct-current circuit breaker are different from those of the traditional alternating-current circuit breaker and the direct-current circuit breaker in the middle and low voltage application field, and no international or national standard for reference exists in the electrical test of the high-voltage direct-current circuit breaker so far. In order to verify the reasonability and correctness of the design of the direct-current circuit breaker and accurately reflect the electrical, thermal and mechanical properties and the like of the direct-current circuit breaker, a test device and a test method related to the test technology of the direct-current circuit breaker are urgently needed to be designed.
Disclosure of Invention
The invention aims to provide a test device for an operation test of a high-voltage direct-current circuit breaker, and the test device can be used for completing a current on-off test, a current off-on test and a reclosing test of the direct-current circuit breaker.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme.
A test device for high voltage direct current breaker operation test, it includes: the direct-current circuit breaker comprises a direct-current charging power supply, a first T-shaped circuit module, a second T-shaped circuit module, a discharging circuit module and an acquisition module, wherein the positive electrode of the direct-current charging power supply is connected with the first ends of the first T-shaped circuit module and the second T-shaped circuit module, the negative electrode of the direct-current charging power supply is connected with the third ends of the first T-shaped circuit module and the second T-shaped circuit module and is grounded, one end of the discharging circuit module is connected with the second ends of the first T-shaped circuit module and the second T-shaped circuit module, the other end of the discharging circuit module is connected with the third ends of the first T-shaped circuit module and the second T-shaped circuit module, and a direct-current circuit breaker test product is connected with the discharging circuit module in parallel; the direct-current charging power supply is used for charging the first T-shaped circuit module and the second T-shaped circuit module, and the first T-shaped circuit module and the second T-shaped circuit module are used for discharging a direct-current breaker test product to perform a high-voltage direct-current breaker operation test; the discharge circuit module is used for discharging residual charges; the acquisition module is used for acquiring data of the test device and the DC circuit breaker test article.
Preferably, the first T-shaped circuit module includes a first charging switch, a first closing switch, a first inductor and a first capacitor; one end of a first charging switch is connected with the positive electrode of the direct-current charging power supply, the other end of the first charging switch is connected with the positive electrode of a first capacitor, a first closing switch is connected with a first inductor in series, one end of a series branch is connected with the positive electrode of the first capacitor, and the other end of the series branch is connected with a direct-current breaker test sample; the second T-shaped circuit module comprises a second charging switch, a second closing switch, a second inductor and a second capacitor; one end of the second charging switch is connected with the positive electrode of the direct-current charging power supply, the other end of the second charging switch is connected with the positive electrode of the second capacitor, the second closing switch is connected with the second inductor in series, one end of the series branch is connected with the positive electrode of the second capacitor, and the other end of the series branch is connected with the direct-current circuit breaker test sample.
Preferably, the first charging switch, the second charging switch, the first closing switch, and the second closing switch are vacuum circuit breakers.
Preferably, the acquisition module is a digital optical fiber acquisition module and is used for acquiring current generated by the test device, current of three branches of the direct current breaker test sample, an action instruction of the direct current breaker test sample and voltage between ends of the direct current breaker test sample.
The invention also provides a high-voltage direct current breaker current on-off test method based on the test device, which comprises the following steps:
step 1, opening a second charging switch, a first closing switch, a second closing switch, a discharging switch, closing a first charging switch and a direct-current circuit breaker;
step 2, starting an acquisition module, starting a direct current charging power supply, charging a first capacitor to a set voltage, and opening a first charging switch;
step 3, closing the first closing switch, discharging the first capacitor through the first reactor, increasing the current, triggering the body overcurrent protection by the direct current breaker after a few ms, executing the opening operation, and collecting test data by using a collection module;
step 4, closing the discharge switch, and discharging residual charges through the discharge resistor R to complete the 1-time on-off process of the direct current breaker;
and 5, repeating the steps 1 to 4 for set times to complete the current on-off test of the direct current breaker.
The invention also provides a high-voltage direct-current breaker current closing test method based on the test device, which is characterized by comprising the following steps of:
step 1, opening a second charging switch, a second closing switch, a discharging switch, a direct current breaker, and closing a first charging switch and a first closing switch;
step 2, starting an acquisition module, starting a direct current charging power supply to charge a first capacitor to a set voltage, and opening a first charging switch;
step 3, switching on the direct current breaker, discharging the first capacitor through the first reactor, increasing the current, and collecting test data by the collection module;
step 4, closing the discharge switch, and discharging residual charges through the discharge resistor R to complete a current closing process of the direct current breaker;
and 5, repeating the steps 1 to 4 for a set number of times to complete the current closing test of the direct current breaker.
The invention also provides a reclosing test method of the high-voltage direct-current circuit breaker based on the test device, which comprises the following steps of:
step 1, opening a second charging switch, a first closing switch, a second closing switch, a discharging switch, closing a first charging switch and a direct-current circuit breaker;
step 2, starting an acquisition module, starting a direct current charging power supply to charge a first capacitor to a specified voltage, then switching off a first charging switch, switching on a second charging switch, charging the second capacitor to the specified voltage by the direct current charging power supply, and then switching off the second charging switch;
step 3, closing the first closing switch, discharging the first capacitor through the first reactor, increasing the current, triggering the body overcurrent protection by the direct current breaker after a few ms, executing opening operation, and acquiring test data by the acquisition module;
step 4, after a required time interval, sequentially opening a first closing switch and closing a second closing switch, and after hundreds of ms, executing reclosing operation of the direct-current circuit breaker, wherein the acquisition module acquires test data;
step 5, closing the discharge switch, and discharging residual charges through the discharge resistor R to complete a reclosing process of the direct current breaker;
and 6, repeating the steps 1 to 5 for set times to complete the reclosing test of the direct current breaker.
The invention also provides a DC breaker operation test method based on the test device, which comprises the following steps:
performing a current breaking test by using the current breaking test method of the high-voltage direct current circuit breaker of claim 5;
performing a current closing test by using the current closing test method of the high-voltage direct current circuit breaker of claim 6;
carrying out a reclosing test by using the reclosing test method of the high-voltage direct current circuit breaker of claim 7;
the sequence of the current on-off test, the current off-on test and the reclosing test can be randomly arranged.
Compared with the prior art, the test device and the test method provided by the invention at least have the following beneficial effects: the test device can be used for completing a current on-off test, a current off-on test and a reclosing test of the direct current breaker. The testing device provided by the invention is equivalent to two groups of independent T-shaped circuit modules, the capacitance value, the inductance value and the charging voltage can be respectively and independently set, the discharge parameters of the two groups of oscillating circuits can be more flexibly and conveniently controlled, and the discharge parameters are not mutually influenced.
The resistor is used as the discharge resistor, and the device has at least two beneficial effects, namely, residual charges are discharged through the discharge resistor after the test, faults of a direct current breaker test product are found in the capacitance charging process, the energy of the discharge capacitor can be discharged through the discharge resistor at any voltage through the discharge resistor, and the device is more flexible and convenient compared with other protection devices with action thresholds.
Compared with the preferred embodiment that the vacuum circuit breaker is used as the charging switch and the closing switch, the preferred embodiment that the vacuum circuit breaker is used as the charging switch and the closing switch does not need to use a sequential control time sequence mode to perform a current breaking test, a switching-off instruction needs to be sent to the direct current circuit breaker after a testing system sends the closing instruction to the thyristor, and the direct current circuit breaker executes the switching-off instruction according to an action time sequence strictly, so that the vacuum circuit breaker is used as the preferred embodiment, the cost is low, the reverse withstand voltage problem of an isolation valve does not need to be considered, the equipment reliability is higher, and.
Drawings
Fig. 1 is a test apparatus for an operation test of a high voltage dc circuit breaker according to the present invention;
FIG. 2 is a flow chart of a current breaking test method of the direct current breaker based on the test device;
FIG. 3 is a flow chart of a DC breaker current closing test method based on the test device of the invention;
FIG. 4 is a flow chart of a reclosing test method of the direct current breaker based on the test device;
in the figure:
a DC-DC charging power supply;
k11 — first charge switch;
k12 — second charge switch;
k21-first closing switch;
k22-second closing switch;
k3-discharge switch;
l1 — first reactor;
l2 — second reactor;
r-discharge resistance.
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 application is not limited thereby.
Example 1: testing device
One of the purposes of the invention is to provide a test device for an operation test of a high-voltage direct-current circuit breaker, and the test device can be used for completing a current on-off test, a current off-on test and a reclosing test of the direct-current circuit breaker.
As shown in fig. 1, a test apparatus for an operation test of a high voltage dc circuit breaker includes: the device comprises a direct-current charging power supply DC, a first T-shaped circuit module, a second T-shaped circuit module, a discharging circuit module, an acquisition module and a direct-current breaker test article.
The positive pole of the direct current charging power supply DC is connected with the first ends of the first T-shaped circuit module and the second T-shaped circuit module, the negative pole of the direct current charging power supply DC is connected with the third ends of the first T-shaped circuit module and the second T-shaped circuit module and is grounded, one end of the discharging circuit module is connected with the second ends of the first T-shaped circuit module and the second T-shaped circuit module, the other end of the discharging circuit module is connected with the third ends of the first T-shaped circuit module and the second T-shaped circuit module, and the direct current circuit breaker test sample is connected with the discharging circuit module in parallel.
The direct current charging power supply DC is used for charging the first T-shaped circuit module and the second T-shaped circuit module, the first T-shaped circuit module and the second T-shaped circuit module are used for discharging a test sample of the direct current breaker to carry out an operation test of the high-voltage direct current breaker,
the discharge circuit module is used for discharging residual charges.
The acquisition module is used for acquiring data of the test device and the DC breaker test sample, including but not limited to current generated by the test device, current of three branches of the DC breaker test sample, action instructions of the DC breaker test sample and voltage between ends of the DC breaker test sample. The technical personnel in the field can select any acquisition and measurement equipment according to test conditions, in the preferred embodiment, a digital optical fiber acquisition module is used without limitation, and the digital optical fiber acquisition module is characterized in that a shunt can be placed at a high potential for testing in an electrical appliance test, so that the high-voltage isolation problem is fundamentally solved, and compared with an analog optical fiber system, the digital optical fiber acquisition module has high signal-to-noise ratio, excellent linearity and no bandwidth limitation by modulation frequency.
The first T-shaped circuit module comprises a first charging switch K11, a first closing switch K21, a first inductor L1 and a first capacitor C1; one end of the first charging switch K11 is connected to the positive electrode of the DC charging power supply DC, the other end is connected to the positive electrode of the first capacitor C1, the first closing switch K21 is connected in series to the first inductor L1, one end of the series branch is connected to the positive electrode of the first capacitor C1, and the other end is connected to the DC breaker test sample.
The second T-shaped circuit module comprises a second charging switch K12, a second closing switch K22, a second inductor L2 and a second capacitor C2; one end of the second charging switch K12 is connected to the positive electrode of the DC charging power supply DC, the other end is connected to the positive electrode of the second capacitor C2, the second closing switch K22 is connected in series to the second inductor L2, one end of the series branch is connected to the positive electrode of the second capacitor C2, and the other end is connected to the DC breaker test sample.
The first charging switch K11, the second charging switch K12, the first closing switch K21 and the second closing switch K22 may be any type of switches including, but not limited to, power electronic switches or mechanical switches. In a further preferred embodiment, the first charging switch K11, the second charging switch K12, the first closing switch K21 and the second closing switch K22 may be vacuum circuit breakers.
With ifRepresents the maximum fault current for the test at tfIndicating experimental current developmentTime; by U01Represents the highest charging voltage of the first capacitor C1; by U02Represents the highest charging voltage of the second capacitor C2; with C1Represents the capacitance value of the first capacitor C1; with C2Represents the capacitance value of the second capacitor C2; with L1Represents the inductance value of the first inductor L1; with L2Representing the inductance value of the second inductor L2. The above parameters are selected to satisfy at least the following conditions:
the parameters of the capacitor and the inductor need to be selected in a matched mode, the selected range is large, the parameters are mainly determined according to the current on-off time and the current detection time of the direct current breaker, and the parameter selection principle needs to ensure that the moment of the test current generated by the direct current breaker is completed on the rising edge of the test current generated by the T-shaped circuit module.
The voltage parameters of the vacuum circuit breaker are mainly based on the highest charging voltage U of the first capacitor C1 and the second capacitor C201And U02And determining the current parameters mainly according to the short-time on-off current and the maximum on-off current of the direct current breaker.
The capacitor in the T-shaped circuit module can be formed by connecting a plurality of capacitors in series and in parallel, and the capacitor bank meets the requirements of generating test voltage and test current.
The reactor in the T-shaped circuit module can be selected to be fixed or adjustable, the rated voltage is determined according to the charging voltage of the capacitor bank, the rated current is determined according to the short-time on-off current and the maximum on-off current of the direct current breaker, and the insulation level is determined according to the overvoltage established after the test current is switched on and off by the direct current breaker.
The discharge switch K3 and the discharge resistor R need to be determined according to the maximum test voltage, the test current and the test energy generated by the T-shaped circuit module, and the insulation level of the discharge switch needs to be determined according to the overvoltage established after the test current is cut off by the direct current breaker.
The test device provided by the invention at least comprises the following beneficial effects: the test device can be used for completing a current on-off test, a current off-on test and a reclosing test of the direct current breaker. The testing device provided by the invention is equivalent to two groups of independent T-shaped circuit modules, the capacitance value, the inductance value and the charging voltage can be respectively and independently set, the discharge parameters of the two groups of oscillating circuits can be more flexibly and conveniently controlled, and the discharge parameters are not mutually influenced.
The digital optical fiber acquisition module has the advantages that the shunt can be placed at a high potential for testing in an electrical appliance test, the high-voltage isolation problem is fundamentally solved, the signal-to-noise ratio of a simulation optical fiber system is high, the linearity is excellent, and the bandwidth is not limited by modulation frequency.
The resistor is used as the discharge resistor, and the device has at least two beneficial effects, namely, residual charges are discharged through the discharge resistor after the test, faults of a direct current breaker test product are found in the capacitance charging process, the energy of the discharge capacitor can be discharged through the discharge resistor at any voltage through the discharge resistor, and the device is more flexible and convenient compared with other protection devices with action thresholds.
Compared with the preferred embodiment that the vacuum circuit breaker is used as the charging switch and the closing switch, the preferred embodiment that the vacuum circuit breaker is used as the charging switch and the closing switch does not need to use a sequential control time sequence mode to perform a current breaking test, a switching-off instruction needs to be sent to the direct current circuit breaker after a testing system sends the closing instruction to the thyristor, and the direct current circuit breaker executes the switching-off instruction according to an action time sequence strictly, so that the vacuum circuit breaker is used as the preferred embodiment, the cost is low, the reverse withstand voltage problem of an isolation valve does not need to be considered, the equipment reliability is higher, and.
Example 2: current breaking test of direct current breaker
The current breaking test is used for checking the current capacity of the direct current breaker breaking direct current system under various working conditions, is the core of the breaker type test, and is also a one-time test for the functions of all parts of the whole breaker.
As shown in fig. 2, a dc breaker current breaking test based on the test device includes the following steps:
step 1, opening a second charging switch K12, a first closing switch K21, a second closing switch K22 and a discharging switch K3, closing the first charging switch K11 and a direct-current breaker;
step 2, starting an acquisition module, starting a direct current charging power supply DC, charging a first capacitor C1 to a set voltage, and opening a first charging switch K11;
step 3, closing a first closing switch K21, discharging a first capacitor C1 through a first reactor L1, increasing current, triggering body overcurrent protection by a direct current breaker after a few ms, executing opening operation, and collecting test data by using a collection module; specifically, data of a test device and a direct current breaker test sample are collected, including but not limited to current generated by the test device, current of three branches of the direct current breaker test sample, an action instruction of the direct current breaker test sample, and inter-terminal voltage of the direct current breaker test sample;
step 4, closing a discharge switch K3, and discharging residual charges through a discharge resistor R to complete the 1-time on-off process of the direct current breaker;
and 5, repeating the steps 1 to 4 for set times to complete the current on-off test of the direct current breaker.
The skilled person can clearly recognize that the DC breaker current on-off test based on the test device has the beneficial effect that by using the test device and the test method provided by the invention, various DC breaker on-off tests can be completed, including but not limited to, the DC breaker low current on-off test, the rated current on-off test and the short circuit current on-off test, only by flexibly configuring the parameters of the DC charging power supply DC and the T-shaped circuit module.
Example 3: DC breaker current closing test
The current closing test is used for checking the capability of the direct current breaker for closing various different currents of the direct current system. The test is used for verifying whether the rated current and the short-circuit current closing capability of the circuit breaker can meet the requirements or not. The two tests are essentially different. The rated current closing test mainly aims at the situation that current is transferred from the transfer branch to the main branch until the circuit breaker operates in a stable state after the circuit breaker is closed under the condition that a system has no fault. The short-circuit current closing is mainly aimed at the situation that the short-circuit current is directly cut off by a transfer branch circuit after the breaker is closed under the condition that the short-circuit fault of the system is not eliminated, so that the breaker completes one-time switching-off operation. The former relates to a main branch and a transfer branch, and the latter relates to a transfer branch and an energy consumption branch.
A test current is generated through the T-shaped circuit module device, and a current peak value and a current rising rate meeting the direct-current breaker current closing test are generated by adjusting the charging voltage of the first capacitor C1, the first reactor L1 and the direct-current charging power supply DC. And controlling the direction of the test current by adjusting the charging polarity of the direct current charging power supply DC.
As shown in fig. 3, a high voltage dc circuit breaker current closing test based on the test apparatus includes the following steps:
step 1, opening a second charging switch K12, a second closing switch K22, a discharging switch K3 and a direct current breaker, and closing a first charging switch K11 and a first closing switch K21;
step 2, starting an acquisition module, starting a direct-current charging power supply DC to charge a first capacitor C1 to a set voltage, and opening a first charging switch K11;
step 3, switching on the direct current breaker, discharging the first capacitor C1 through the first reactor L1, increasing the current, and acquiring test data by an acquisition module; specifically, data of a test device and a direct current breaker test sample are collected, including but not limited to current generated by the test device, current of three branches of the direct current breaker test sample, an action instruction of the direct current breaker test sample, and inter-terminal voltage of the direct current breaker test sample;
step 4, closing a discharge switch K3, and discharging residual charges through a discharge resistor R to complete a current closing process of the direct current breaker;
and 5, repeating the steps 1 to 4 for a set number of times to complete the current closing test of the direct current breaker.
Example 4: reclosing test of direct current breaker
The reclosing test is used for examining hundreds of milliseconds of the direct current breaker, namely the capability of the direct current system for removing the free time and continuously breaking the short-circuit current twice in an interval, and is also a test for simultaneously testing the functions of all parts of the whole breaker.
The test current is generated through the T-shaped circuit module, the current peak value and the current rising rate which meet the first on-off current of the direct-current circuit breaker are generated by adjusting the charging voltage of the first capacitor C1, the first reactor L1 and the direct-current charging power supply DC, and the current peak value and the current rising rate which meet the second on-off current of the direct-current circuit breaker are generated by adjusting the charging voltage of the second capacitor C2, the second reactor L2 and the direct-current charging power supply DC. And controlling the direction of the test current by adjusting the charging polarity of the direct current charging power supply DC.
As shown in fig. 4, a reclosing test of a dc circuit breaker based on the test device includes the following steps:
step 1, opening a second charging switch K12, a first closing switch K21, a second closing switch K22, a discharging switch K3, closing a first charging switch K11 and a direct-current breaker;
step 2, starting an acquisition module, starting a direct-current charging power supply DC to charge a first capacitor C1 to a specified voltage, then switching off a first charging switch K11, switching on a second charging switch K12, charging a second capacitor C2 to a specified voltage by the direct-current charging power supply DC, and then switching off the second charging switch K12;
step 3, closing a first closing switch K21, discharging a first capacitor C1 through a first reactor L1, enabling current to rise, triggering body overcurrent protection by a direct current breaker after a few ms, executing opening operation, and acquiring test data by an acquisition module; specifically, data of a test device and a direct current breaker test sample are collected, including but not limited to current generated by the test device, current of three branches of the direct current breaker test sample, an action instruction of the direct current breaker test sample, and inter-terminal voltage of the direct current breaker test sample;
step 4, after a required time interval, sequentially opening a first closing switch K21 and closing a second closing switch K22, and after a few ms, executing reclosing operation of the direct current breaker, wherein an acquisition module acquires test data;
step 5, closing a discharge switch K3, and discharging residual charges through a discharge resistor R to complete a reclosing process of the direct current breaker;
and 6, repeating the steps 1 to 5 for set times to complete the reclosing test of the direct current breaker.
Example 5: high-voltage direct-current circuit breaker operation test method
The preferred embodiment of the invention also provides a high-voltage direct-current circuit breaker operation test method based on the test device, which comprises the following steps:
the test device is used for carrying out the direct current breaker current on-off test of the embodiment 2, the current closing test of the embodiment 3 and the reclosing test of the embodiment 4, and the three test sequences can be arranged randomly.
Compared with the prior art, the test device and the test method provided by the invention at least have the following beneficial effects: the test device can be used for completing a current on-off test, a current off-on test and a reclosing test of the direct current breaker. The testing device of the invention is equivalent to two groups of independent T-shaped circuit modules, can respectively and independently set the capacitance value, the inductance value and the charging voltage, can more flexibly and more conveniently control the discharging parameters of the two groups of T-shaped circuit modules, and does not influence each other.
The resistor is used as the discharge resistor, and the device has at least two beneficial effects, namely, residual charges are discharged through the discharge resistor after the test, faults of a direct current breaker test product are found in the capacitance charging process, the energy of the discharge capacitor can be discharged through the discharge resistor at any voltage through the discharge resistor, and the device is more flexible and convenient compared with other protection devices with action thresholds.
The digital optical fiber acquisition module has the advantages that the shunt can be placed at a high potential for testing in an electrical appliance test, the high-voltage isolation problem is fundamentally solved, the signal-to-noise ratio of a simulation optical fiber system is high, the linearity is excellent, and the bandwidth is not limited by modulation frequency.
Compared with the preferred embodiment that the vacuum circuit breaker is used as the charging switch and the closing switch, the preferred embodiment that the vacuum circuit breaker is used as the charging switch and the closing switch does not need to use a sequential control time sequence mode to perform a current breaking test, a switching-off instruction needs to be sent to the direct current circuit breaker after a testing system sends the closing instruction to the thyristor, and the direct current circuit breaker executes the switching-off instruction according to an action time sequence strictly, so that the vacuum circuit breaker is used as the preferred embodiment, the cost is low, the reverse withstand voltage problem of an isolation valve does not need to be considered, the equipment reliability is higher, and.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (8)
1. A test device for high voltage direct current breaker operation test, it includes: a direct current charging power supply (DC), a first T-shaped circuit module, a second T-shaped circuit module, a discharging circuit module and an acquisition module,
the positive pole of a direct current charging power supply (DC) is connected with the first ends of the first T-shaped circuit module and the second T-shaped circuit module, the negative pole of the direct current charging power supply (DC) is connected with the third ends of the first T-shaped circuit module and the second T-shaped circuit module and is grounded, one end of the discharging circuit module is connected with the second ends of the first T-shaped circuit module and the second T-shaped circuit module, the other end of the discharging circuit module is connected with the third ends of the first T-shaped circuit module and the second T-shaped circuit module, and a direct current breaker test sample is connected with the discharging circuit module in parallel;
the direct current charging power supply (DC) is used for charging the first T-shaped circuit module and the second T-shaped circuit module, and the first T-shaped circuit module and the second T-shaped circuit module are used for discharging a direct current breaker test product to perform a high-voltage direct current breaker operation test; the discharge circuit module is used for discharging residual charges; the acquisition module is used for acquiring data of the test device and the DC circuit breaker test article.
2. The test device for the operation test of the high-voltage direct-current circuit breaker according to claim 1, characterized in that:
the first T-shaped circuit module comprises a first charging switch (K11), a first closing switch (K21), a first inductor (L1) and a first capacitor (C1); one end of a first charging switch (K11) is connected with the positive electrode of a direct current charging power supply (DC), the other end of the first charging switch is connected with the positive electrode of a first capacitor (C1), a first closing switch (K21) is connected with a first inductor (L1) in series, one end of a series branch is connected with the positive electrode of the first capacitor (C1), and the other end of the series branch is connected with a direct current breaker test sample;
the second T-shaped circuit module comprises a second charging switch (K12), a second closing switch (K22), a second inductor (L2) and a second capacitor (C2); one end of a second charging switch (K12) is connected with the positive electrode of a direct current charging power supply (DC), the other end of the second charging switch is connected with the positive electrode of a second capacitor (C2), a second closing switch (K22) is connected with a second inductor (L2) in series, one end of a series branch is connected with the positive electrode of the second capacitor (C2), and the other end of the series branch is connected with a direct current breaker test article.
3. The test device for the operation test of the high-voltage direct current circuit breaker according to claim 2, characterized in that:
the first charging switch (K11), the second charging switch (K12), the first closing switch (K21), and the second closing switch (K22) are vacuum circuit breakers.
4. The test device for the operation test of the high-voltage direct current circuit breaker according to any one of claims 1 to 3, characterized in that:
the acquisition module is a digital optical fiber acquisition module and is used for acquiring current generated by the test device, current of three branches of the direct-current breaker test sample, an action instruction of the direct-current breaker test sample and voltage between ends of the direct-current breaker test sample.
5. A current breaking test method of a high-voltage direct current breaker based on the test device of any one of claims 2 to 4 is characterized by comprising the following steps:
step 1, opening a second charging switch (K12), a first closing switch (K21), a second closing switch (K22) and a discharging switch (K3), closing a first charging switch (K11) and a direct-current breaker;
step 2, starting an acquisition module, starting a direct current charging power supply (DC), charging a first capacitor (C1) to a set voltage, and opening a first charging switch (K11);
step 3, a first closing switch (K21) is closed, a first capacitor (C1) discharges through a first reactor (L1), the current rises, a direct current breaker triggers body overcurrent protection after a few ms, opening operation is executed, and an acquisition module is used for acquiring test data;
step 4, closing a discharge switch (K3), and discharging residual charges through a discharge resistor R to finish the on-off process of the direct current breaker for 1 time;
and 5, repeating the steps 1 to 4 for set times to complete the current on-off test of the direct current breaker.
6. A high-voltage direct current breaker current closing test method based on the test device of any one of claims 2 to 4 is characterized by comprising the following steps:
step 1, opening a second charging switch (K12), a second closing switch (K22), a discharging switch (K3) and a direct current breaker, and closing a first charging switch (K11) and a first closing switch (K21);
step 2, starting an acquisition module, starting a direct current charging power supply (DC) to charge a first capacitor (C1) to a set voltage, and opening a first charging switch (K11);
step 3, switching on the direct current breaker, discharging a first capacitor (C1) through a first reactor (L1), increasing current, and collecting test data by a collection module;
step 4, closing the discharge switch (K3), and discharging residual charges through the discharge resistor R to complete a current closing process of the direct current breaker;
and 5, repeating the steps 1 to 4 for a set number of times to complete the current closing test of the direct current breaker.
7. A reclosing test method of a high-voltage direct-current circuit breaker based on the test device of any one of claims 2 to 4 is characterized by comprising the following steps of:
step 1, opening a second charging switch (K12), a first closing switch (K21), a second closing switch (K22), a discharging switch (K3), closing a first charging switch (K11) and a direct-current breaker;
step 2, starting an acquisition module, starting a direct current charging power supply (DC) to charge a first capacitor (C1) to a specified voltage, then switching off a first charging switch (K11), switching on a second charging switch (K12), charging a second capacitor (C2) to the specified voltage by the direct current charging power supply (DC), and then switching off the second charging switch (K12);
step 3, a first closing switch (K21) is closed, a first capacitor (C1) discharges through a first reactor (L1), the current rises, a direct current breaker triggers body overcurrent protection after a few ms, opening operation is executed, and an acquisition module acquires test data;
step 4, after a required time interval, sequentially opening a first closing switch (K21) and closing a second closing switch (K22), and after hundreds of ms, executing reclosing operation of the direct current breaker, wherein the acquisition module acquires test data;
step 5, closing a discharge switch (K3), and discharging residual charges through a discharge resistor R to complete a reclosing process of the direct current breaker;
and 6, repeating the steps 1 to 5 for set times to complete the reclosing test of the direct current breaker.
8. A DC breaker operation test method based on the test device of any one of claims 2 to 4 is characterized by comprising the following steps:
performing a current breaking test by using the current breaking test method of the high-voltage direct current circuit breaker of claim 5;
performing a current closing test by using the current closing test method of the high-voltage direct current circuit breaker of claim 6;
carrying out a reclosing test by using the reclosing test method of the high-voltage direct current circuit breaker of claim 7;
the sequence of the current on-off test, the current off-on test and the reclosing test can be randomly arranged.
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| CN113917268A (en) * | 2021-10-19 | 2022-01-11 | 中国电信股份有限公司 | Simulation lightning voltage generator and automatic reclosing lightning protection capability testing device |
| CN114814568A (en) * | 2022-06-29 | 2022-07-29 | 中国电力科学研究院有限公司 | Closing and aging test device for vacuum circuit breaker and aging parameter determination method |
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