CN112147503A - Direct current breaker test system and method - Google Patents
Direct current breaker test system and method Download PDFInfo
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- CN112147503A CN112147503A CN202011190638.8A CN202011190638A CN112147503A CN 112147503 A CN112147503 A CN 112147503A CN 202011190638 A CN202011190638 A CN 202011190638A CN 112147503 A CN112147503 A CN 112147503A
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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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- 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
- G01R31/333—Testing of the switching capacity of high-voltage circuit-breakers ; Testing of breaking capacity or related variables, e.g. post arc current or transient recovery voltage
- G01R31/3333—Apparatus, systems or circuits therefor
- G01R31/3336—Synthetic testing, i.e. with separate current and voltage generators simulating distance fault conditions
Abstract
The invention discloses a direct current breaker testing system and a direct current breaker testing method, and belongs to the technical field of direct current breakers. The system specifically comprises: the current source is used for providing fault current for the circuit breaker interface module; the oscillation branch circuit is used for providing a current zero crossing point for the circuit breaker interface module; the voltage source is used for providing recovery voltage for the circuit breaker interface module; the circuit breaker interface module includes an isolation diode for isolating the connection between the voltage source and the current source and the oscillating branch. The method specifically comprises the following steps: under the action of fault current, the tested fracture breaks down; under the action of the isolation diode, the oscillation branch circuit is conducted with a voltage source to provide a current zero crossing point and restore voltage for the tested fracture. The invention effectively reduces the manufacturing cost of the direct current breaker test system by using the isolation diode.
Description
Technical Field
The invention belongs to the technical field of direct current circuit breakers, and particularly relates to a direct current circuit breaker testing system and a direct current circuit breaker testing method.
Background
The direct current transmission can improve the utilization efficiency of renewable energy power generation, and is widely applied to countries in the world. With the continuous expansion of the scale of the direct current power grid and the increasing complexity of the direct current power grid structure, the direct current circuit breaker is widely applied. The test technology of the direct current circuit breaker as an important means for evaluating the performance of the circuit breaker also becomes a hotspot of research of each test station. At present, a synthetic test method is mainly adopted when a laboratory carries out a large-capacity breaking test.
Due to the fact that the fault current of the high-voltage direct-current transmission system rises quickly and the voltage level is high, the fault current required to be cut off by the direct-current circuit breaker is large, the rising rate and the amplitude of the recovery voltage are high, and high requirements are provided for a test loop of the direct-current circuit breaker. In a large-capacity on-off test, the method for generating the fault current by adopting the capacitance and the inductance oscillation is the most economic and effective fault current generation method and is widely applied, but the required fault current is large, and the capacitance is required to be large. Meanwhile, the breaker needs a large fault current for breaking in a short time, and the oscillating branch needs to generate a large reverse high-frequency current due to the short time of the whole breaking process, so that the capacitance of the oscillating branch is required to be large. When a traditional synthetic test loop is adopted to carry out a breaking test, the capacitor voltage is reduced by increasing the capacitor due to the limitation of the capacitor voltage grade, but the recovery voltage and the rise rate (du/dt) of the recovery voltage at two ends of a mechanical fracture are lower after the current passes zero, and the equivalent process of the recovery voltage and the rise rate (du/dt) of the recovery voltage is difficult to be realized with an actual system breaking process. Therefore, the research of an economical synthetic test loop with good equivalence with the actual high-voltage direct-current on-off process is of great significance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a direct current breaker test system and a direct current breaker test method, and aims to solve the problem that the direct current breaker test system is difficult to manufacture due to the fact that the existing direct current breaker is large in fault current required during cutting and high in recovery voltage rising rate and amplitude.
In order to achieve the aim, the invention provides a direct current breaker testing system which comprises a current source, an oscillation branch circuit, a breaker interface module and a voltage source which are sequentially connected in parallel;
the current source is used for providing fault current for the circuit breaker interface module; the oscillation branch circuit is used for providing a current zero crossing point for the circuit breaker interface module; the voltage source is used for providing recovery voltage for the circuit breaker interface module; the circuit breaker interface module comprises an isolation diode D, wherein the anode of the isolation diode D is connected with the oscillation branch circuit, and the cathode of the isolation diode D is connected with the voltage source and used for isolating the connection between the voltage source and the current source as well as the oscillation branch circuit.
Preferably, the oscillating branch comprises a second capacitor C2, a second inductor L2, a second spark gap K2 and a first resistor R1;
one end of the second spark gap K2 is connected in series with the second capacitor C2 and the second inductor L2, the other end of the second spark gap K2 is connected with the first resistor R1, and the first resistor R is connected in parallel with the second capacitor C2 and the second inductor L2;
the second spark gap K2 is used to conduct when a fault occurs; the second capacitor C2 and the second inductor L2 are used for providing current zero-crossing points for the circuit breaker interface module through oscillation, and further assisting the circuit breaker interface module to switch fault current; the first resistor R1 is used for limiting the voltage across the second capacitor C2 and the second inductor L2, and eliminating the influence of the oscillation branch on the voltage source.
Preferably, the voltage source comprises a third capacitor C3, a fourth capacitor C01, a fifth capacitor C02, a third inductor L01, a third spark gap K3 and a second resistor R2;
the fourth capacitor C01 and the third inductor L01 are connected in series to form a first branch circuit, and the third capacitor C3 and the second resistor R2 are connected in series to form a second branch circuit; one end of the third spark gap K3 is connected in parallel with the first branch, the second branch and the fifth capacitor C02;
the third spark gap K3 is used for conducting synchronously with the second spark gap K2 when the fault current reaches the set value; when the tested fracture CB is not closed, the third capacitor C3 is used for providing the first current to the circuit breaker interface module 3 through the second resistor R2; when the tested fracture CB is not closed, the third capacitor C3 charges a fifth capacitor C02 through the second resistor R2, and the fifth capacitor is used for providing recovery voltage for the tested fracture; the fourth capacitor C01 and the third inductor L01 are used for generating oscillating current; the oscillation current is equal to the first current in magnitude and opposite in direction, and a current zero crossing point is provided for the tested fracture CB; the second resistor R2 and the fifth capacitor C02 are used for adjusting the rising rate of the recovery voltage at the two ends of the tested fracture CB.
Preferably, the circuit breaker interface module further comprises an arrester MOV, the arrester is connected with the tested fracture CB in parallel during testing, and the parallel end of the arrester is connected with one side of the isolation diode D, which is connected with the voltage source; the arrester MOV is used to absorb the stored energy of the inductive element and limit the overvoltage.
Preferably, the current source comprises a first capacitor C1, a first inductor L1 and a first spark gap K1 connected in series; the first spark gap K1 is used for conduction during testing; the first capacitor C1 and the first inductor L1 are used for oscillating to generate a fault current.
Based on the disclosed DC breaker test system, the invention provides a corresponding test method, which comprises the following steps:
under the action of fault current, the tested fracture CB has a fault; under the action of the isolation diode D, the oscillation branch circuit is conducted with a voltage source to provide a current zero crossing point and restore voltage for the tested fracture CB.
Preferably, the specific steps of providing the current zero-crossing point are:
when the tested fracture breaks down, the oscillation branch is conducted;
the first resistor R1 is adopted to limit the voltage at two ends of the second capacitor C2 and the second inductor L2, and the second capacitor C2 and the second inductor L2 are oscillated to provide a current zero crossing point for the tested fracture CB;
when the fault current reaches a set value, a voltage source is switched on;
when the tested fracture CB is not turned off, a third capacitor C3 and a second resistor R2 are adopted to generate a first current; generating an oscillating current by using the fourth capacitor C01 and the third inductor L01;
and superposing the first current and the oscillation current to provide a current zero crossing point for the tested fracture CB.
Preferably, the specific steps for recovering the voltage are:
when the tested fracture is switched off, the third capacitor C3 charges the fifth capacitor C02 through the second resistor R2, and the fifth capacitor C02 provides recovery voltage for the tested fracture.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) the invention uses the isolation diode to block the connection between the voltage source and the current source and the oscillation branch, realizes the isolation of the small-capacitance high-voltage branch (voltage source) and the large-capacitance low-voltage branch (current source and oscillation branch), ensures that the voltage source can provide the required recovery voltage for the tested fracture by adopting a small capacitance, and effectively reduces the manufacturing cost of the direct current breaker test system.
(2) The invention adopts the first resistor to eliminate the influence of the oscillation branch circuit on the voltage source, and ensures that the voltage source better simulates the recovery voltage.
(3) The voltage source disclosed by the invention can adjust the rising rate of the recovery voltage at the two ends of the tested fracture through the second resistor and the fifth capacitor, and can further reduce the manufacturing cost of regulating and controlling the recovery voltage.
Drawings
FIG. 1 is a schematic block diagram of a DC circuit breaker synthesis test system provided by the present invention;
FIG. 2 is a detailed circuit diagram of the DC breaker synthesis test system provided by the present invention;
the same reference numbers are used throughout the drawings to refer to the same elements or structures, wherein 1: a current source; 2: an oscillation branch; 3: a circuit breaker interface module; 4: a voltage source; c1: a first capacitor; c2: a second capacitor; c3: a third capacitor; c01: a fourth capacitor; c02 is a fifth capacitor; l1 is a first inductor; l2: a second inductor; l01: a third inductor; k1: a first spark gap; k2: a second spark gap; k3: a third spark gap; CB: a tested fracture; MOV: a lightning arrester; d: an isolation diode; r1: a first resistor; r2: a second resistor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a direct current breaker testing system, which comprises a current source 1, an oscillation branch 2, a breaker interface module 3 and a voltage source 4 which are sequentially connected in parallel;
the current source 1 is used for providing fault current for the breaker interface module 3; the oscillation branch 2 is used for providing a current zero crossing point for the circuit breaker interface module 3; the voltage source 4 is used for providing a recovery voltage for the circuit breaker interface module 3; the circuit breaker interface module 3 comprises an isolation diode D, the anode of which is connected with the oscillation branch 2, and the cathode of which is connected with the voltage source 4, and is used for isolating the connection between the voltage source 4 and the current source 1 and the oscillation branch 2.
Preferably, the oscillating branch 2 comprises a second capacitor C2, a second inductor L2, a second spark gap K2 and a first resistor R1;
one end of the second spark gap K2 is connected in series with the second capacitor C2 and the second inductor L2, the other end of the second spark gap K2 is connected with the first resistor R1, and the first resistor R1 is connected in parallel with the second capacitor C2 and the second inductor L2;
the second spark gap K2 is used to conduct when a fault occurs; the second capacitor C2 and the second inductor L2 are used for providing a current zero crossing point for the circuit breaker interface module 3 through oscillation, and further assisting the circuit breaker interface module to switch fault current; the first resistor R1 is used to limit the voltage across the second capacitor C2 and the second inductor L2, and eliminate the influence of the oscillation branch 2 on the voltage source.
Preferably, the voltage source 4 comprises a third capacitor C3, a fourth capacitor C01, a fifth capacitor C02, a third inductor L01, a third spark gap K3 and a second resistor R2;
the fourth capacitor C01 and the third inductor L01 are connected in series to form a first branch circuit, and the third capacitor C3 and the second resistor R2 are connected in series to form a second branch circuit; the first branch circuit, the second branch circuit and the fifth capacitor C02 are respectively connected with three ends of the third spark gap to realize parallel connection;
the third spark gap K3 is used for conducting synchronously with the second spark gap K2 when the fault current reaches the set value; when the tested fracture CB is not closed, the third capacitor C3 is used for providing the first current to the circuit breaker interface module 3 through the second resistor R2; when the tested fracture CB is not closed, the third capacitor C3 charges a fifth capacitor C02 through the second resistor R2, and the fifth capacitor is used for providing recovery voltage for the tested fracture; the fourth capacitor C01 and the third inductor L01 are used for generating oscillating current; the oscillation current is equal to the first current in magnitude and opposite in direction, and a current zero crossing point is provided for the tested fracture CB; the second resistor R2 and the fifth capacitor C02 are used for adjusting the rising rate of the recovery voltage at the two ends of the tested fracture CB.
Preferably, the circuit breaker interface module 3 further comprises an arrester MOV, the arrester is connected in parallel with the tested break CB during the test, and the parallel end of the arrester is connected with one side of the isolation diode D connected with the voltage source; the arrester MOV is used to absorb the stored energy of the inductive element and limit the overvoltage.
Preferably, the current source 1 comprises a first capacitor C1, a first inductor L1 and a first spark gap K1 connected in series; the first spark gap K1 is used for conduction during testing; the first capacitor C1 and the first inductor L1 are used for oscillating to generate a fault current.
Based on the disclosed DC breaker test system, the invention provides a corresponding test method, which comprises the following steps:
under the action of fault current, the tested fracture CB has a fault; under the action of the isolation diode D, the oscillation branch circuit 2 is conducted with the voltage source 4, and provides a current zero crossing point and recovery voltage for the tested fracture CB.
Preferably, the specific steps of providing the current zero-crossing point are:
when the tested fracture CB has a fault, the oscillation branch is conducted;
limiting the voltage at two ends of the second capacitor C2 and the second inductor L2 by adopting a first resistor R1, and providing a current zero crossing point for a tested fracture by oscillating the second capacitor C2 and the second inductor L2;
when the fault current reaches a set value, a voltage source is switched on;
when the tested fracture CB is not turned off, a third capacitor C3 and a second resistor R2 are adopted to generate a first current; generating an oscillating current by using the fourth capacitor C01 and the third inductor L01;
and superposing the first current and the oscillation current to provide a current zero crossing point for the tested fracture CB.
Preferably, the specific steps for recovering the voltage are:
when the tested fracture is switched off, the third capacitor C3 charges the fifth capacitor C02 through the second resistor R2, and the fifth capacitor C02 provides recovery voltage for the tested fracture.
Examples
As shown in fig. 1, the present embodiment provides a direct current circuit breaker testing system, which includes a current source 1, an oscillation branch 2, a circuit breaker interface module 3, and a voltage source 4, which are connected in parallel in sequence; the current source 1 is used for providing fault current for the breaker interface module; the oscillation branch 2 and the voltage source 4 are simultaneously conducted when a fault occurs; the oscillation branch circuit 2 is used for providing a current zero crossing point for the circuit breaker interface module 3, and the current zero crossing point is used for cutting off fault current of the circuit breaker interface module; the voltage source 4 is used to provide a recovery voltage for the circuit breaker interface module.
The overall work flow of the embodiment is as follows:
the current source 1 provides fault current for the circuit breaker interface module, when a fault occurs, the oscillation branch 2 and the voltage source 4 are conducted at the same time, the oscillation branch 2 provides a current zero crossing point for the circuit breaker interface module 3, and the circuit breaker interface module is assisted to cut off the fault current; the voltage source 4 is used to provide a recovery voltage for the circuit breaker interface module.
Preferably, as shown in fig. 2, the current source 1 includes a first capacitor C1, a first inductor L1, and a first spark gap K1; for providing fault current to the circuit breaker interface module; the oscillating branch 2 comprises a second capacitor C2, a second inductor L2, a second spark gap K2 and a first resistor R1; the resistance value of the first resistor R1 is very small, and the first resistor R1 is mainly used for limiting the voltages at two ends of the second capacitor C2 and the second inductor L2 and eliminating the influence of the oscillation branch module on the voltage source module; the breaker interface module 3 comprises an isolation diode D and an arrester MOV, and during testing, a tested break is connected with the arrester MOV in parallel; the arrester MOV is used for absorbing the stored energy of the inductive element and limiting the overvoltage; the isolation diode D is used for blocking the connection between the voltage source and the current source and between the voltage source and the oscillation branch circuit, and the manufacturing difficulty of the voltage source module is reduced. The voltage source 4 comprises a third capacitor C3, a fourth capacitor C01, a fifth capacitor C02, a third inductor L01, a third spark gap K3 and a second resistor R2, when the tested fracture CB is successfully closed, the third capacitor C3 quickly charges the fifth capacitor C02 through the second resistor R2, and the fifth capacitor provides recovery voltage for the tested fracture; by adjusting the parameters of the second resistor R2 and the fifth capacitor C02, the rising rate of the recovery voltage at the two ends of the circuit breaker interface module CB can be flexibly adjusted.
Accordingly, the working flow of the embodiment is specifically as follows:
after the first spark gap K1 is triggered to be conducted, the first capacitor C1 and the first inductor L1 oscillate to provide fault current for the circuit breaker interface module 3; when the fault current reaches a set value, triggering the second spark gap K2 and the third spark gap K3 to be conducted; the second capacitor C2 and the second inductor L2 generate oscillating current to provide a current zero crossing point for the circuit breaker interface module 3; the first resistor R1 eliminates the influence of the oscillating branch 2 on the voltage source 4; the third capacitor C3 supplies the first current to the breaker interface module 3 through the second resistor R2, and simultaneously the fourth capacitor C01 and the third inductor L01 oscillate to generate an oscillating current; the oscillation current is equal to the first current in magnitude and opposite in direction, and a current zero crossing point is provided for the tested fracture CB; before the tested fracture CB is successfully turned off, the voltage at two ends of the tested fracture CB is lower, and the voltage at two ends of the fifth capacitor C02 is almost zero; when the tested fracture CB is successfully closed, the third capacitor C3 charges the fifth capacitor C02 through the second resistor R2; the rising rate of recovery voltage at two ends of the tested fracture CB can be flexibly adjusted by adjusting the parameters of the second resistor R2 and the fifth capacitor C02; during the period that the voltage source 4 is put into operation, the discharge channel from the third capacitor C3 to the current source 1 and the oscillation branch 2 is cut off by utilizing the one-way conductivity of the isolation diode D, so that the isolation of the small-capacitor high-voltage branch and the large-capacitor low-voltage branch is realized, the voltage source branch can provide high recovery voltage for the circuit breaker interface module by adopting the small capacitor, and the manufacturing cost of the synthetic loop is reduced.
In summary, compared with the prior art, the invention has the following advantages:
the invention uses the isolation diode to block the connection between the voltage source and the current source and the oscillation branch, realizes the isolation of the small-capacitance high-voltage branch (voltage source) and the large-capacitance low-voltage branch (current source and oscillation branch), ensures that the voltage source can provide the required recovery voltage for the tested fracture by adopting a small capacitance, and effectively reduces the manufacturing cost of the direct current breaker test system.
The invention adopts the first resistor to eliminate the influence of the oscillation branch circuit on the voltage source, and ensures that the voltage source better simulates the recovery voltage.
The voltage source disclosed by the invention can adjust the rising rate of the recovery voltage at the two ends of the tested fracture through the second resistor and the fifth capacitor, and can further reduce the manufacturing cost of regulating and controlling the recovery voltage.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A direct current breaker test system is characterized by comprising a current source (1), an oscillation branch (2), a breaker interface module (3) and a voltage source (4) which are sequentially connected in parallel;
the current source (1), the oscillation branch (2) and the voltage source (4) are respectively used for providing fault current, current zero crossing points and recovery voltage for the circuit breaker interface module (3); the circuit breaker interface module (3) comprises an isolation diode, the anode of the isolation diode is connected with the oscillation branch circuit (2), the cathode of the isolation diode is connected with the voltage source (4), and the isolation diode is used for isolating the connection between the voltage source (4) and the current source (1) and the oscillation branch circuit (2).
2. The direct current circuit breaker testing system according to claim 1, characterized in that the oscillating branch (2) comprises a second capacitance, a second inductance, a second spark gap and a first resistance;
one end of the second spark gap is connected with the second capacitor and the second inductor in series, the other end of the second spark gap is connected with the first resistor, and the first resistor is connected with the second capacitor and the second inductor in parallel;
the second spark gap is used for conducting when a fault occurs; the second capacitor and the second inductor are used for providing a current zero crossing point for the circuit breaker interface module (3) through oscillation; the first resistor is used for limiting the voltage at two ends of the second capacitor and the second inductor and eliminating the influence of the oscillation branch (2) on the voltage source.
3. The direct current circuit breaker testing system according to claim 1 or 2, characterized in that the voltage source (4) comprises a third capacitor, a fourth capacitor, a fifth capacitor, a third inductor, a third spark gap and a second resistor;
the fourth capacitor and the third inductor are connected in series to form a first branch circuit, and the third capacitor and the second resistor are connected in series to form a second branch circuit; the first branch circuit, the second branch circuit and the fifth capacitor are respectively connected with three ends of the third spark gap to realize parallel connection;
the third spark gap is used for being synchronously conducted with the second spark gap when the fault current reaches a set value; when the tested fracture is not switched off, the third capacitor is used for providing first current to the breaker interface module (3) through the second resistor; the fourth capacitor and the third inductor are used for generating oscillating current; when the tested fracture is not turned off, the third capacitor charges a fifth capacitor through the second resistor, and the fifth capacitor is used for providing recovery voltage for the tested fracture; the oscillation current is equal to the first current in magnitude and opposite in direction, and provides a current zero crossing point for the tested fracture; the second resistor and the fifth capacitor are used for adjusting the rising rate of the recovery voltage.
4. The direct current circuit breaker testing system according to claim 1, wherein the circuit breaker interface module (3) further comprises an arrester, the arrester is connected in parallel with the tested fracture during testing, and the parallel end of the arrester is connected with one side of the isolation diode connected with the voltage source; the lightning arrester is used for absorbing energy stored by the inductive element and limiting overvoltage.
5. The direct current circuit breaker testing system according to claim 1 or 4, characterized in that the current source (1) comprises a first capacitor, a first inductor and a first spark gap connected in series; the first spark gap is used for conducting in test; the first capacitor and the first inductor are used for oscillating to generate fault current.
6. A test method based on the DC breaker test system of claim 1,
the tested fracture breaks down under the action of fault current; under the action of the isolation diode, the oscillation branch circuit (2) is conducted with a voltage source (4) to provide a current zero crossing point and restore voltage for the tested fracture.
7. The test method according to claim 6, characterized in that the specific steps of providing a zero crossing of the current are:
when the tested fracture breaks down, the oscillation branch (2) is conducted;
limiting the voltages at two ends of the second capacitor and the second inductor by adopting the first resistor, and providing a current zero crossing point for the tested fracture by oscillating the second capacitor and the second inductor;
when the fault current reaches a set value, a voltage source (4) is switched on;
when the tested fracture is not turned off, a third capacitor and a second resistor are adopted to generate a first current; generating an oscillating current by using a fourth capacitor and a third inductor;
and superposing the first current and the oscillation current to provide a current zero crossing point for the tested fracture.
8. Test method according to claim 6 or 7, characterized in that the specific steps of providing a recovery voltage are:
when the tested fracture is switched off, the third capacitor charges the fifth capacitor through the second resistor, and the fifth capacitor provides recovery voltage for the tested fracture.
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| CN202011190638.8A CN112147503B (en) | 2020-10-30 | 2020-10-30 | Test method based on direct current breaker test system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030214302A1 (en) * | 2001-05-20 | 2003-11-20 | Ernst Slamecka | Synthetic making/breaking-capacity test circuit for high-voltage alternating-current circuit-breakers |
| CN104035025A (en) * | 2014-06-20 | 2014-09-10 | 中国船舶重工集团公司第七一二研究所 | Zero-current mixed switching-off technology testing device and zero-current mixed switching-off technology testing method |
| CN106526473A (en) * | 2016-11-24 | 2017-03-22 | 华中科技大学 | Mechanical type high-voltage DC breaker on-off equivalent test loop and method |
| CN107728048A (en) * | 2017-09-05 | 2018-02-23 | 许继电气股份有限公司 | A kind of mixed type high voltage DC breaker pilot system |
| CN110161405A (en) * | 2019-07-01 | 2019-08-23 | 大连理工大学 | Three power supply direct currents of one kind cut-off synthetic test loop and its test method |
-
2020
- 2020-10-30 CN CN202011190638.8A patent/CN112147503B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030214302A1 (en) * | 2001-05-20 | 2003-11-20 | Ernst Slamecka | Synthetic making/breaking-capacity test circuit for high-voltage alternating-current circuit-breakers |
| CN104035025A (en) * | 2014-06-20 | 2014-09-10 | 中国船舶重工集团公司第七一二研究所 | Zero-current mixed switching-off technology testing device and zero-current mixed switching-off technology testing method |
| CN106526473A (en) * | 2016-11-24 | 2017-03-22 | 华中科技大学 | Mechanical type high-voltage DC breaker on-off equivalent test loop and method |
| CN107728048A (en) * | 2017-09-05 | 2018-02-23 | 许继电气股份有限公司 | A kind of mixed type high voltage DC breaker pilot system |
| CN110161405A (en) * | 2019-07-01 | 2019-08-23 | 大连理工大学 | Three power supply direct currents of one kind cut-off synthetic test loop and its test method |
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| CN112147503B (en) | 2022-01-18 |
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