CN201886949U - Strong-current locking device for earth switch of high-voltage switch cabinet - Google Patents

Abstract

The utility model mainly discloses a strong-current locking device for an earth switch of a high-voltage switch cabinet. The strong-current locking device comprises a live display, a live sensor and an electromagnet. The live sensor is connected with the live display, the electromagnet comprises an electromagnetic coil and a switch button which are in series connection on a high-voltage detection circuit, and the extension of the electromagnet is controlled by means of opening and closing of the electromagnetic coil. The switch cabinet is provided with an earth switch baffle which is provided with a pin hole corresponding to the electromagnet. The strong-current locking device effectively avoids the problem that the earth switch cannot be operated due to failure in opening the earth switch baffle on high-voltage live condition inside the switch cabinet.

Description

High-voltage switchgear grounding knife strong current locking device

technical field

The utility model relates to a strong electric locking device, in particular to a high-voltage switch cabinet grounding knife strong electric locking device.

Background technique

In the existing field of power distribution technology, the high-voltage switchgear has generally been designed with a grounding knife on the body to achieve safe grounding of the cabinet during maintenance, replacing the external grounding method, and improving maintenance efficiency and grounding reliability. However, with the intelligent development of the power grid, the diversification of power supply schemes is getting higher and higher. In the current situation where new and old equipment coexist, there is a situation of reverse power transmission between switch stations. When some switchgear in the power distribution network is in reverse In the power transmission and power supply mode, if the grounding knife is operated in the conventional way, it will cause the busbar to be short-circuited to the ground. In order to minimize the accidents of electrified grounding accidents and ensure the safety of people and equipment, the switchgear can be equipped with a strong current locking device.

There are many ways to realize the strong electric lock. In order to realize the reliability of the lock, and take into account the convenience of installation and operation, as well as the economic feasibility of the device cost, the inventor designed this strong electric lock through the combination of electricity and machinery. device, and through operation practice, good results have been achieved.

Utility model content

The utility model provides a high-voltage switch cabinet grounding knife strong electric locking device, which can effectively prevent the grounding knife from being mistakenly closed when the high voltage in the cabinet is powered.

In order to achieve the above object, the technical solution adopted by the utility model is:

The high-voltage switchgear grounding knife strong current locking device mainly includes a charged display, a charged sensor, and an electromagnet; the charged sensor is connected to the charged display; the electromagnet control includes an electromagnetic coil and a switch button connected in series on the high-voltage detection circuit, and the electromagnetic coil on-off control The electromagnet is telescopic; there is a grounding knife baffle on the switch cabinet, and a pin hole corresponding to the electromagnet is opened on the grounding knife baffle.

A miniature circuit breaker is connected in parallel at the front end of the strong current locking circuit of the grounding knife, and an external control power supply is used as the working power supply of the strong current locking device of the grounding knife.

The electromagnetic lock relay coil and the switch button are connected in series on the locking output contact branch of the electrified display.

The grounding blade baffle has outwardly extending paddles.

The charged indicator is installed on the switch cabinet door.

The switch button is installed on the switch cabinet door.

After adopting the above scheme, the locking output contact of the charged display is disconnected under the condition of high voltage and electricity in the utility model, which will cause the electromagnetic coil to lose power, the electromagnet cannot break away from the pin hole on the grounding knife baffle, and the paddle cannot be pressed. , the ground knife cannot be operated. In the case of high voltage and no electricity, the locking output contact of the charged display is closed, and the electromagnetic coil is powered on by pressing the switch button, and the electromagnet can be separated from the pin hole on the grounding knife baffle, and the paddle can be pressed at this time. Insertable handle to operate grounding knife. When the detection circuit has no working power supply, the locking output contact of the charged display is in the normally open state, and the plectrum cannot be pressed no matter whether the high voltage is charged or not. The locking condition is provided by the locking output contact of the charged display, which can more truly reflect the live situation in the cabinet. Effectively prevent serious accidents caused by mishandling the grounding knife in the case of high voltage live.

Description of drawings

Fig. 1 is the circuit diagram of preferred embodiment of the present utility model;

Fig. 2 is a schematic structural view of the grounding knife baffle in a preferred embodiment of the present invention;

Fig. 3 is a partial schematic diagram of a preferred embodiment of the utility model installed on the cabinet (the grounding knife block is not depressed);

Fig. 4 is a partial schematic diagram of a preferred embodiment of the utility model installed on the cabinet (the grounding knife block is pressed down).

Detailed ways

In conjunction with Fig. 1 to Fig. 4, the utility model is described in further detail.

As shown in Figure 1, the structure of the preferred embodiment of the utility model: (1) charged sensors CGa~c and charged display GSN three-phase indicator lights A~C constitute a high-voltage detection circuit. If a certain phase is electrified, light the indicator light on the corresponding cabinet door. (2) Introduce the power point ±KM from the control circuit of the switch cabinet, as the working power supply of the strong current locking circuit of the grounding knife, and protect the circuit through the miniature circuit breaker DZK, and the locking output contact K1 of the electrified display GSN and the switch button JA, Electromagnetic coils DSN are connected in series to form a closed circuit.

In the selection of the live display GSN, in addition to the conventional detection of high-voltage electrical signals, it also needs to have a latching output contact. The contact is closed only when the high voltage is de-energized and the working power supply is energized; when the high-voltage is energized or the working power supply loses power, the contacts are all disconnected.

The physical structure of the utility model is shown in Figures 2 to 4. The operating hole of the switch cabinet grounding knife is generally designed on the right side column (the switch cabinet with a frame structure is the front end of the right side plate), and the normal operating hole is covered by the internal grounding knife. Baffle plate 2 is blocked. A paddle 4 extends outward from the grounding knife baffle plate 2. When the grounding knife needs to be operated, press the paddle 4 with your hand to press down the grounding knife baffle plate 2, and then insert the operating handle for operation. After pulling out the operating handle The grounding knife guard 2 will reset itself.

Punch a circular hole as pin hole 3 on the grounding knife back plate 2, electromagnet 1 is installed next to pin hole 3, under normal conditions, electromagnet 1 inserts pin hole 3, locks grounding knife back plate 2. The telescopic state of the electromagnet 1 is controlled by the switch button JA and the electromagnetic coil DSN.

When the electromagnetic coil DSN is electrically turned on, the electromagnet 1 shrinks, breaks away from the pin hole 3, and releases the lock. If the electromagnetic coil DSN loses power, then the electromagnet 1 releases, that is, it is in an elongated state, causing it to be unable to break away from the pin hole 3, no matter how the plectrum 4 is pressed down, the grounding knife back plate 2 cannot be moved, and the lock is realized.

When the utility model is working, 1. When the control power supply DC220V is working normally, if there is power at high voltage, the GSN locking output contact K1 is disconnected. When the switch button JA is pressed, the electromagnetic coil DSN is still out of power, and the electromagnetic coil cannot be controlled. The iron 1 breaks away from the pin hole 3 and the paddle 4 cannot be operated to operate the grounding knife. 2. When the control power supply is working normally, if there is no power at high voltage, the GSN locking output contact K1 is closed. When the switch button JA is pressed, the electromagnetic coil DSN is energized, the electromagnet 1 is separated from the pin hole 3, and the paddle 4 is pressed. , the grounding knife baffle plate 2 can be moved down, and the handle can be inserted to operate the grounding knife. 3. When the control power supply disappears, regardless of whether the high voltage is charged or not, the GSN contact K1 is in a disconnected state, and the paddle 4 cannot be moved when the switch button JA is pressed.

The utility model is suitable for the strong electric lock of the grounding knife of various high-voltage switch cabinets, and is used to prevent the grounding knife from being mistakenly closed when the high voltage in the cabinet is electrified, and effectively prevent the occurrence of short-circuit accidents to the ground caused by the wrong grounding of the high-voltage switch cabinet , to protect the safety of people, equipment and power grid.

Claims (6)

1. high-tension switch cabinet ground connection cutter forceful electric power locking device is characterized in that: comprise electrification display, electrified sensor, electromagnet; Electrified sensor is connected with electrification display; Magnet control comprises solenoid and the shift knob that is connected on the high-voltage detecting circuit, and solenoid break-make control electromagnet is flexible; On switch cubicle, have ground connection cutter baffle plate, have the pin-and-hole corresponding on the ground connection cutter baffle plate with electromagnet.

2. high-tension switch cabinet ground connection cutter forceful electric power locking device as claimed in claim 1 is characterized in that: described ground connection cutter forceful electric power locked loop front end miniature circuit breaker in parallel, external control power supply is as the working power of ground connection cutter forceful electric power locking device.

3. high-tension switch cabinet ground connection cutter forceful electric power locking device as claimed in claim 1 is characterized in that: described solenoid and shift knob are to be connected on the locking output contact branch road of electrification display.

4. high-tension switch cabinet ground connection cutter forceful electric power locking device as claimed in claim 1, it is characterized in that: described ground connection cutter baffle plate has outward extending plectrum.

5. high-tension switch cabinet ground connection cutter forceful electric power locking device as claimed in claim 1, it is characterized in that: described electrification display is installed on the door of switch cabinet.

6. high-tension switch cabinet ground connection cutter forceful electric power locking device as claimed in claim 1, it is characterized in that: described shift knob is installed on the door of switch cabinet.

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