CN214473789U

CN214473789U - 150kA oscillation short-circuit laboratory test equipment

Info

Publication number: CN214473789U
Application number: CN202120283908.3U
Authority: CN
Inventors: 唐建平; 安平
Original assignee: Shanghai Electric Power Intelligent Equipment Technology Co ltd
Current assignee: Shanghai Electric Power Intelligent Equipment Technology Co ltd
Priority date: 2021-02-01
Filing date: 2021-02-01
Publication date: 2021-10-22
Anticipated expiration: 2031-02-01

Abstract

The utility model discloses a 150kA oscillation short circuit laboratory test equipment, a serial communication port, including charging module, current module, measurement system and short circuit control system, external power source charges for the current module through the module that charges, and the current module charges the back and supplies power for the equipment under test at short circuit control system, accomplishes the measurement to the test current and the test voltage of equipment under test by measurement system. The utility model provides a pair of LC oscillation short circuit laboratory test equipment provides the ability of breaking of all products about the short circuit characteristic can objectively be examined for domestic low voltage apparatus laboratory and enterprise's product research and development laboratory. The utility model discloses convenient operation, cost are lower, can export great impulse current, have positive meaning to improving relevant product outgoing quality and operational reliability.

Description

150kA oscillation short-circuit laboratory test equipment

Technical Field

The utility model relates to a test equipment for carrying out circuit breaker divides disconnected experiment.

Background

The circuit breaker breaking test is a direct and effective method for checking the breaking capacity of a circuit breaker or a breaking device. In a breaker breaking test, an impulse generator is generally adopted as a test power supply. However, the impulse generator is expensive, complex in technology and complex in operation, and manufacturers generally do not have such testing means.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the impact generator used in the breaker breaking test is expensive, complex in technology and complex in operation.

In order to solve the technical problem, the technical scheme of the utility model provides a 150kA oscillation short circuit laboratory test equipment, a serial communication port, including charging module, current module, measurement system and short circuit control system, external power source charges for the current module through the module that charges, and the power supply is supplied for the equipment under test under short circuit control system control after the current module charges, accomplishes the measurement to the test current and the test voltage of equipment under test by measurement system, wherein:

the charging module comprises a breaker QF1, a contactor KM1, a voltage regulator and a transformer, an external power supply is connected with the voltage regulator through the breaker QF1 and the contactor KM1 and then is connected with the primary side of the transformer, the secondary side of the transformer is connected with the input end of a single-phase rectifier bridge, and the output end of the single-phase rectifier bridge is connected with the input end of a current-limiting resistor R through a current-limiting resistor R_sThe grounding knife II is connected with the input end of the current module; the output end of the single-phase rectifier bridge is grounded through a grounding knife I; the short-circuit control system drives the first grounding knife and the second grounding knife through the rotary electromagnet;

the current module comprises a first capacitor bank and a second capacitor bank, the first capacitor bank and the second capacitor bank are subjected to constant-current charging through the charging module, and the charged first capacitor bank and the charged second capacitor bank supply power to the tested equipment.

Preferably, the current module comprises the first capacitor bank and the second capacitor bank;

one end of each capacitor in the capacitor bank is connected to the positive electrode of the single-phase rectifier tube through the grounding knife through a respective capacitor grouping switch and a high-voltage current limiting fuse for protection; the other end of each capacitor in the capacitor bank is connected to one end of a grounding resistor R3, and the other end of the grounding resistor R3 is grounded through the second grounding knife;

the capacitor bank comprises an arcing frequency modulation capacitor C0 and an overvoltage limiting capacitor C1, wherein the overvoltage limiting capacitor C1 is connected with an overvoltage limiting resistor R1 in series and then is connected with a first separating gate switch, a second separating gate switch and a third separating gate switch in series through the first separating gate switch, the second separating gate switch and the third separating gate switch in parallel; the arcing frequency modulation capacitor C0 is connected with the arcing frequency modulation resistor R0 in series and then is connected with the two ends of the overvoltage limiting capacitor C1 and the overvoltage limiting resistor R1 which are connected in series in parallel to the second grounding knife; the device to be tested is connected in parallel with two ends of an arc frequency modulation capacitor C0 and an arc frequency modulation resistor R0 which are connected in series;

one end of the grounding resistor R2 is connected between the resonant reactance 1L and the first grounding knife, and the other end is grounded through the first grounding knife;

the first opening switch, the second opening switch, the third opening switch, the first grounding switch and the second grounding switch are controlled by the short circuit control system.

The utility model provides a pair of LC oscillation short circuit laboratory test equipment provides the ability of cutting off of all products (main products are moulded case circuit breaker, frame circuit breaker, dual supply, miniature switch and equipment circuit breaker) about the short circuit characteristic objectively for domestic low voltage apparatus laboratory and enterprise's product research and development laboratory. The utility model discloses convenient operation, cost are lower, can export great impulse current, have positive meaning to improving relevant product outgoing quality and operational reliability.

Drawings

Fig. 1 is a schematic diagram of the 150kA oscillation short-circuit laboratory test equipment provided by the present invention.

Detailed Description

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.

The utility model provides a design requirement 750V reaches below, 150kA short circuit laboratory test equipment for detect all products (main products are moulded case circuit breaker, frame circuit breaker, dual supply, micro-switch and equipment circuit breaker) about the short circuit characteristic.

With reference to fig. 1, the present invention provides a 150kA oscillation short-circuit laboratory test apparatus comprising:

a charging module:

in this embodiment, the charging module includes a 125A molded case circuit breaker QF1, a contactor KM1, a voltage regulator ZT1, and a transformer BT 1. Alternating current provided by an external power supply passes through a 125A molded case circuit breaker QF1 and a contactor QF1, and then is connected to the primary side of a transformer BT1 after passing through a voltage regulator ZT1 in sequence. The single-phase rectifier bridge ZL1 formed by the rectifier silicon stack performs single-phase rectification on the output generated by the secondary side of the transformer BT1 and passes through the current-limiting resistor R_sThen, the charging current of the charging module is generated through the contactor KM 2.

A current module:

the charging current output by the charging module charges the capacitor group I and the capacitor group II in the current module for constant current (approximately equal to 5A) charging. After the set voltage value is reached, the contactor KM2 is opened, and the tested equipment EUT can be tested. After the test is finished, the short-circuit control system drives the grounding knife I KD1 and the grounding knife II KD2 to discharge through the rotary electromagnet, and the safety of a tester is guaranteed. The charging time from 0 to 2000V is expected to vary from 6 to 15 min.

The current module further includes a current and arcing circuit. The capacitor bank one in the embodiment comprises a capacitance grouping switch KD01 and a capacitance grouping switch KD02 which are connected by n capacitors C1 … Cn. The n capacitors C1 … Cn are grounded through a ground resistor R3 and a ground knife two KD 2.

The second capacitor bank in this embodiment includes an arc frequency modulation capacitor C0 and an overvoltage limiting capacitor C1, the arc frequency modulation capacitor C0 is connected in series with an arc frequency modulation resistor R0, and the overvoltage limiting capacitor C1 is connected in series with an overvoltage limiting resistor R1.

The current module in this embodiment further includes a resonant reactance L1, a first open switch KD001, a second open switch KD002, and a third open switch KD 003. And a grounding resistor R2 is connected between the resonant reactance L1 and the grounding knife-KD 1, and the grounding resistor R2 is grounded through the grounding knife-KD 1.

The first separating switch KD001, the second separating switch KD002, the third separating switch KD003, the capacitor grouping switch KD01 and the capacitor grouping switch KD02 are controlled by a short circuit control system.

The capacitor C1 … Cn, the arcing frequency modulation capacitor C0 and the overvoltage limiting capacitor C1 in the circuit are pulse capacitors which have large overcurrent input and cut off, and in order to avoid the expansion of accidents, each capacitor is connected with a high-voltage current limiting fuse in series, and the high-voltage current limiting fuse is selected to be a 100A high-voltage current limiting fuse with the model of XRNMT-3.6/100A.

The first separating brake switch KD001, the second separating brake switch KD002 and the third separating brake switch KD003 are protection switches. And the opening switch three KD003 is used for closing. According to the design of 150kA, a 3P vacuum switch of VS1-12/4000A is selected as the three-KD 003 opening switch, and three poles are connected in parallel during wiring. Because VS 1-12/4000A's single-stage breaking capacity only has 40kA, and the return circuit requirement is 150kA, chooses for use 2 vacuum switch 6 utmost points to connect in parallel and realizes breaking, is about to divide brake switch KD001 and divide brake switch two KD002 to connect in parallel, guarantees the utility model provides an experimental facilities accomplishes and divides the branch and divide the operation of closing.

The measurement system comprises:

the system is composed of sensors of all gears, a charging current sensor CT1, a test sample testing current sensor CT2, a power supply voltage sensor TV1, a charging voltage sensor TV2, a test sample voltage sensor TV3 and a PXI analog quantity acquisition system, and measurement of testing current and testing voltage is completed. It should be noted that the devices making up the measurement system are conventional to those skilled in the art. In the embodiment, a PXI analog quantity acquisition system selects a PXI-6123 acquisition card for acquiring voltage and current, the acquisition card is a synchronous acquisition card, and the sampling rate of each channel is 500 kS/s.

The sample current sensor CT2 adopts ROGWISKI coil (soft coil, 1112 type) and integrator of JJ system, the measuring range is 10/100/1000/10000 full range power frequency measuring accuracy is 1%, frequency response is 0-100kHZ, the full range of output signal is 1V, each range can bear 6 times of full range current (peak value) for a long time;

short-circuit control system:

the system is composed of devices such as a contactor, a relay and the like and a PXI-6514 digital quantity input and output module, and the digital quantity module controls corresponding execution devices to complete various functions of the system. It should be noted that the short circuit control system is a conventional device to those skilled in the art. In this embodiment, the main functions of the control system are as follows:

receiving test setting and operation instructions from a human-computer interface;

the control system completes the connection and disconnection of the test power supply according to the setting of the tester and the test flow;

controlling a voltage loop contactor to close and open according to a required sequence to finish a test; reading the feedback of the contactor to ensure normal action;

and controlling the rotary electromagnet to act so as to operate the grounding knife one KD1 and the grounding knife two KD2 to complete the opening and closing of the grounding discharge.

Claims

1. The utility model provides a 150kA oscillation short circuit laboratory test equipment which characterized in that, is including charging module, current module, measurement system and short circuit control system, and external power source charges for the current module through the module of charging, and the current module charges the back and is supplied power for Equipment Under Test (EUT) under short circuit control system control, accomplishes the measurement to the test current and the test voltage of Equipment Under Test (EUT) by measurement system, wherein:

the charging module comprises a breaker QF1, a contactor KM1, a voltage regulator (ZT1) and a transformer (BT1), an external power supply is connected with the voltage regulator (ZT1) through the breaker QF1 and the contactor KM1 and then is connected to the primary side of the transformer (BT1), the secondary side of the transformer (BT1) is connected with the input end of a single-phase rectifier bridge (ZL1), and the output end of the single-phase rectifier bridge (ZL1) is connected with the input end of a current-limiting resistor R through a current-limiting resistor_sThe grounding knife II (KD2) is connected with the input end of the current module; the output end of the single-phase rectifier bridge (ZL1) is grounded through a first grounding knife (KD 1); the short-circuit control system drives a first grounding knife (KD1) and a second grounding knife (KD2) through the rotary electromagnet;

the current module comprises a first capacitor bank and a second capacitor bank, the first capacitor bank and the second capacitor bank are subjected to constant-current charging through the charging module, and the charged first capacitor bank and the charged second capacitor bank supply power to a tested Equipment (EUT).

2. The 150kA oscillating short circuit laboratory test rig of claim 1, wherein the current module comprises the first capacitor bank and the second capacitor bank;

one end of each capacitor in the first capacitor bank is connected to the secondary side of the transformer (BT1) via the ground knife two (KD2) via a respective capacitance grouping switch; the other end of each capacitor in the first capacitor bank is connected to one end of a grounding resistor R3, and the other end of the grounding resistor R3 is grounded through the grounding knife II (KD 2);

the second capacitor bank comprises an arc burning frequency modulation capacitor C0 and an overvoltage limiting capacitor C1, and the overvoltage limiting capacitor C1 is connected in series with the overvoltage limiting resistor R1 and then is connected to two ends of the second grounding knife (KD2) through a first separating-gate switch (KD001), a second separating-gate switch (KD002) and a resonant reactance L1 which are connected in parallel; the arcing frequency modulation capacitor C0 is connected in series with the arcing frequency modulation resistor R0 and then is connected in parallel at two ends of the overvoltage limiting capacitor C1 and the overvoltage limiting resistor R1 which are connected in series through a three-way (KD003) opening switch; the device under test (EUT) is connected in parallel at two ends of an arc burning frequency modulation capacitor C0 and an arc burning frequency modulation resistor R0 which are connected in series;

one end of the grounding resistor R2 is connected between the resonant reactance L1 and the grounding knife II (KD2), and the other end is grounded through the knife of the grounding knife I (KD 1);

the first separating switch (KD001), the second separating switch (KD002), the third separating switch (KD003) and the capacitor grouping switches are controlled by the short-circuit control system.