High-voltage circuit breaker synthesis test ignition device and synthesis test device

Abstract

The utility model discloses a high-voltage circuit breaker synthesis test ignition device and a synthesis test device, and belongs to the technical field of high-voltage circuit breaker tests. Comprising a photoelectric isolation unit, an MOS tube, a transformer, a first ignition ball, a first capacitor and a voltage source. The input end of the optoelectronic isolation unit is used for receiving optical pulse signals, the first end of the optoelectronic isolation unit is electrically connected with the grid electrode of the MOS tube, the drain electrode of the MOS tube is electrically connected with the first end of the voltage source, the second end of the voltage source is electrically connected with the first end of the transformer, and the second end of the transformer is electrically connected with the second end of the optoelectronic isolation unit. The third end and the fourth end of the transformer are electrically connected with the first ignition ball, and the first ignition ball is electrically connected with the first capacitor. Operation safety and stability of equipment can be improved, and the problem that an existing ignition device is insufficient in operation safety and stability is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage circuit breaker testing, in particular to a high-voltage circuit breaker synthetic test ignition device and a synthetic test device. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] High-voltage circuit breakers are a type of switching equipment that is mainly used for the control and protection of power systems. They play a vital role in high-voltage electrical lines. They can safely break, carry, and close the current in high-voltage circuits. The working principle of high-voltage circuit breakers is based on the generation and extinction of arcs. They can quickly cut off fault currents, including short-circuit currents, when a fault occurs, thereby protecting other electrical equipment in the power system from damage.

[0004] In order to evaluate the performance of high-voltage circuit breakers under actual grid conditions, synthetic tests are carried out on high-voltage circuit breakers to verify whether the circuit breakers can safely and reliably open or close the predetermined current and voltage levels by simulating various fault conditions in the high-voltage grid.

[0005] In the synthetic test of high-voltage circuit breakers, in order to simulate the transient phenomena in actual operation, an ignition device is used to activate the ball gap. The existing ignition devices are mostly implemented through control unit processing, but the control unit (weak current) and the execution circuit (high voltage) are directly connected, which affects the safety and stability of the device operation. Utility Model Content

[0006] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide a high-voltage circuit breaker synthetic test ignition device and a high-voltage circuit breaker synthetic test device, which completely isolate the control unit from the execution circuit through a photoelectric isolation unit to ensure the safety and stability of the equipment operation.

[0007] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0008] A high-voltage circuit breaker synthetic test ignition device, comprising a photoelectric isolation unit, a MOS tube, a transformer, a first ignition ball, a first capacitor and a voltage source;

[0009] The input end of the photoelectric isolation unit is used to receive an optical pulse signal, the first end of the photoelectric isolation unit is electrically connected to the gate of the MOS tube, the drain of the MOS tube is electrically connected to the first end of the voltage source, the second end of the voltage source is electrically connected to the first end of the transformer, the second end of the transformer is electrically connected to the second end of the photoelectric isolation unit, the third and fourth ends of the transformer are electrically connected to the first ignition ball, and the first ignition ball is electrically connected to the first capacitor.

[0010] By adopting the above technical solution, the control unit and the execution circuit are completely isolated through the photoelectric isolation unit to ensure the stability and safety of the equipment; at the same time, a mechanical switch is arranged inside the device to further improve the stability of the device.

[0011] In some embodiments, it further includes a second capacitor, a second ignition ball, and a circuit breaker;

[0012] The first capacitor is electrically connected to the second ignition ball, and the second ignition ball is electrically connected to the circuit breaker; the first end of the second capacitor is electrically connected to the third end of the transformer, and the second end of the second capacitor is electrically connected to the circuit breaker.

[0013] In some embodiments, the charging voltage of the second capacitor is 50 kV, and the first ignition ball and the second ignition ball are both made of graphite.

[0014] By adopting the above technical solution and using graphite material, the ignition ball is resistant to arc erosion and has a long service life.

[0015] In some embodiments, a voltage doubling charging unit is also included;

[0016] The first end of the voltage doubling charging unit is electrically connected to the first end of the voltage source, and the second end of the voltage doubling charging unit is electrically connected to the second end of the voltage source; the third end of the voltage doubling charging unit is electrically connected to the first end of the first capacitor, and the fourth end of the voltage doubling charging unit is electrically connected to the second end of the first capacitor.

[0017] In some embodiments, the voltage doubling charging unit is a direct current power supply.

[0018] In some embodiments, further comprising a diode;

[0019] The anode of the diode is electrically connected to the source of the MOS tube, the cathode of the diode is electrically connected to the drain of the MOS tube, and the drain of the MOS tube is grounded.

[0020] By adopting the above technical solution, the safety of MOS tube operation is improved and current backflow is prevented.

[0021] In some embodiments, a metal shell is further included, and the photoelectric isolation unit, the MOS tube, the transformer, the first ignition ball, the first capacitor and the voltage source are all arranged inside the metal shell.

[0022] By adopting the above technical solution, each component is placed in a metal shell to solve the problem of electromagnetic compatibility.

[0023] In some embodiments, the charging voltage of the first capacitor is 10 kV, the voltage source is a DC 12 V voltage source, and the transformation ratio of the transformer is 1:2000.

[0024] In some implementations, the MOS transistor is an NMOS transistor, and the photoelectric isolation unit is a photoelectric isolator.

[0025] The embodiment of the utility model further provides a high-voltage circuit breaker synthetic test device, comprising the above-mentioned high-voltage circuit breaker synthetic test ignition device.

[0026] One or more technical solutions provided by the utility model have at least the following technical effects or advantages:

[0027] 1. The technical solution provided by the utility model completely isolates the high-voltage part (execution circuit) of the device from the host computer control unit (weak current) through a photoelectric isolation unit to ensure the safe operation of the equipment.

[0028] 2. The technical solution provided by the utility model uses a MOS tube instead of a mechanical switch. The time from receiving a signal from the ignition device to completing the ignition of the second ignition ball is within 10 μs. While having high speed, it further improves the stability of the device.

[0029] 3. The technical solution provided by the utility model is that the device is sealed inside the metal shell, shielding the electromagnetic interference caused by the operation of the second capacitor to the device, solving the problem of electromagnetic compatibility; at the same time, the first ignition ball and the second ignition ball are both made of graphite material, which is resistant to arc erosion and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0031] Figure 1 It is a circuit diagram provided by an embodiment of the utility model;

[0032] In the figure: 1. High-voltage circuit breaker synthetic test ignition device.

[0033] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0034] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] Embodiment 1

[0036] In the existing ignition device, the control unit and the execution circuit are directly electrically connected through a line. The high voltage of the execution circuit is likely to have an adverse effect on the control unit and affect the normal operation of the device. In order to solve the above technical problems, the utility model proposes a high-voltage circuit breaker synthetic test ignition device 1.

[0037] Combination Figure 1 The high-voltage circuit breaker synthetic test ignition device 1 includes a photoelectric isolation unit, a MOS tube, a transformer, a first ignition ball, a first capacitor, a voltage doubling charging unit and a voltage source. The first ignition ball includes a first ball gap and a second ball gap that are relatively set, and the second ignition ball includes a third ball gap and a fourth ball gap that are relatively set.

[0038] In order to completely isolate the execution circuit and the control unit, a photoelectric isolation unit is provided in the present embodiment, and the third and fourth ends of the photoelectric isolation unit are communicatively connected to the control unit (host computer) for receiving the optical pulse signal sent by the host computer and converting it into an electrical signal; the first end of the photoelectric isolation unit is electrically connected to the gate of the MOS tube, the drain of the MOS tube is electrically connected to the first end of the voltage source, the second end of the voltage source is electrically connected to the first end of the transformer, the second end of the transformer is electrically connected to the second end of the photoelectric isolation unit, the third and fourth ends of the transformer are electrically connected to the first spherical gap, the second spherical gap is electrically connected to the first end of the first capacitor, the second end of the first capacitor is electrically connected to the third spherical gap, the fourth spherical gap is electrically connected to the circuit breaker, the circuit breaker is electrically connected to the first end of the second capacitor, and the second end of the second capacitor is electrically connected to the third spherical gap.

[0039] The first end of the voltage doubling charging unit is electrically connected to the first end of the voltage source, and the second end of the voltage doubling charging unit is electrically connected to the second end of the voltage source; the third end of the voltage doubling charging unit is electrically connected to the first end of the first capacitor, and the fourth end of the voltage doubling charging unit is electrically connected to the second end of the first capacitor.

[0040] In this embodiment, the charging voltage of the first capacitor is 10kV, the charging voltage of the second capacitor is 50kV, the voltage source is a DC12V voltage source, the transformer ratio is 1:2000, the MOS tube is an NMOS tube, the photoelectric isolation unit is a photoelectric isolator, and the voltage doubling charging unit is a DC power supply.

[0041] The working method of this embodiment is as follows:

[0042] The photoelectric isolation unit receives the optical pulse signal sent from the upper computer, converts it into an electrical signal, and triggers the MOS tube to turn on. The voltage source sends a DC12V pulse signal, which is boosted to a 2500V pulse voltage signal by a transformer with a transformation ratio of 2000. The pulse voltage signal ignites the first ignition ball. The conduction of the first ignition ball causes the first capacitor with a charging voltage of 10kV to ignite the second ignition ball. The conduction of the second ignition ball causes a 50kV voltage of the second capacitor to be applied to the circuit breaker.

[0043] In order to extend the service life of the ignition ball, in this embodiment, the first ignition ball and the second ignition ball are both made of graphite material, which is resistant to arc erosion and has a long service life.

[0044] As an implementation method, in order to solve the problem of electromagnetic compatibility and isolate the electromagnetic interference of the second capacitor, it also includes an ignition box, which is made of a metal shell. The photoelectric isolation unit, MOS tube, transformer, first ignition ball, first capacitor and voltage source are all sealed in the ignition box.

[0045] Embodiment 2

[0046] Based on the above-mentioned high-voltage circuit breaker synthetic test ignition device 1, the present embodiment further provides a high-voltage circuit breaker synthetic test device, in which the high-voltage circuit breaker synthetic test ignition device 1 described in the above-mentioned embodiment is provided. Since the above-mentioned high-voltage circuit breaker synthetic test ignition device 1 has the above-mentioned technical effect, the technical effect of the high-voltage circuit breaker synthetic test device using the high-voltage circuit breaker synthetic test ignition device 1 please refer to the above-mentioned embodiment.

[0047] Although the above describes the specific implementation methods of the utility model in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A high voltage circuit breaker synthetic test ignition device, characterized in that: It includes a photoelectric isolation unit, a MOS tube, a transformer, a first ignition ball, a first capacitor and a voltage source; The input end of the photoelectric isolation unit is used to receive an optical pulse signal, the first end of the photoelectric isolation unit is electrically connected to the gate of the MOS tube, the drain of the MOS tube is electrically connected to the first end of the voltage source, the second end of the voltage source is electrically connected to the first end of the transformer, the second end of the transformer is electrically connected to the second end of the photoelectric isolation unit, the third and fourth ends of the transformer are electrically connected to the first ignition ball, and the first ignition ball is electrically connected to the first capacitor.

2. The high-voltage circuit breaker synthetic test ignition device according to claim 1, characterized in that: Also includes a second capacitor, a second ignition ball and a circuit breaker; The first capacitor is electrically connected to the second ignition ball, and the second ignition ball is electrically connected to the circuit breaker; the first end of the second capacitor is electrically connected to the third end of the transformer, and the second end of the second capacitor is electrically connected to the circuit breaker.

3. The high-voltage circuit breaker synthetic test ignition device according to claim 2, characterized in that: The charging voltage of the second capacitor is 50 kV, and the first ignition ball and the second ignition ball are both made of graphite.

4. The high-voltage circuit breaker synthetic test ignition device according to claim 1, characterized in that: Also includes a voltage doubling charging unit; The first end of the voltage doubling charging unit is electrically connected to the first end of the voltage source, and the second end of the voltage doubling charging unit is electrically connected to the second end of the voltage source; the third end of the voltage doubling charging unit is electrically connected to the first end of the first capacitor, and the fourth end of the voltage doubling charging unit is electrically connected to the second end of the first capacitor.

5. The high-voltage circuit breaker synthetic test ignition device according to claim 4, characterized in that: The voltage doubling charging unit is a direct current power supply.

6. The high-voltage circuit breaker synthetic test ignition device according to claim 1, characterized in that: Also includes diodes; The anode of the diode is electrically connected to the source of the MOS tube, the cathode of the diode is electrically connected to the drain of the MOS tube, and the drain of the MOS tube is grounded.

7. The high-voltage circuit breaker synthetic test ignition device according to claim 1, characterized in that: It also includes a metal shell, and the photoelectric isolation unit, the MOS tube, the transformer, the first ignition ball, the first capacitor and the voltage source are all arranged inside the metal shell.

8. The high-voltage circuit breaker synthetic test ignition device according to claim 1, characterized in that: The charging voltage of the first capacitor is 10 kV, the voltage source is a DC12V voltage source, and the transformation ratio of the transformer is 1:2000.

9. The high-voltage circuit breaker synthetic test ignition device according to claim 1, characterized in that: The MOS tube is an NMOS tube, and the photoelectric isolation unit is a photoelectric isolator.

10. A high voltage circuit breaker synthetic test device, characterized in that: It comprises the high-voltage circuit breaker synthetic test ignition device as described in any one of claims 1-9.

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