CN207559280U - Electrical cabinet is grounded blocking device - Google Patents

Abstract

The utility model relates to a grounding locking device for an electric cabinet, which comprises a comprehensive protection device arranged on the electric cabinet. The output end of the device is connected with the auxiliary contacts of the vacuum circuit breaker and the opening and closing coils. The normally open and closing contact is connected in series with the coil of the AC contactor and then connected to the operating power supply of the electrical cabinet to form a closed circuit. The normally closed contact of the AC contactor is connected in series with the closing pressure plate, and the normally open contact of the AC contactor is connected to the ground The indicator lights are connected in series with the operating power supply of the electrical cabinet to form a closed circuit, and the grounding indicator is installed on the operation panel of the electrical cabinet. It prevents the misoperation of the electric cabinet in the extreme situation of being used outdoors and often moving, has more reasonable structure design, more reliable use, and low manufacturing cost.

Description

Electrical cabinet grounding lockout device

technical field

The utility model relates to electrical equipment, in particular to an electrical cabinet grounding locking device, especially for the improvement of KYN series electrical cabinets using XJ Electric WGB-151N series comprehensive protection.

Background technique

KYN28A-12﹙Z﹙series high-voltage electrical cabinets are highly praised by users for their advantages of complete five-proof functions, safe and reliable operation, and are widely used in China. In the mining area, a large number of temporary pumping stations are used in the open air of the stope. After the external protection is installed, it becomes an outdoor type. Due to mining needs, the temporary pumping station in the non-flood season needs to be moved down frequently to drain water in time to ensure the operation of electric shovels, drilling rigs and other related equipment. At this time, it is necessary to remove all the power lines and motor load lines in the electrical cabinet. Go to the designated position, and then restore the connection after the electrical cabinet is fixed.

This work needs to open the cable room door at the bottom and rear of the electrical cabinet. Because the five-proof function prevents stray into the live space, the grounding knife of the electrical cabinet must be closed before opening the rear cabinet door; It may cause negligence, and the switch is switched on and the power is transmitted under the condition that the grounding knife is closed. As we all know, the high-voltage electrical cabinet has five protections, among which there is protection against switching on when the grounding knife is closed, but the essence of this protection is that the handcart cannot be shaken from the test position to the working position when the grounding knife is closed. The five-defense protection is designed according to the use of the fixed electromagnetic station. The power supply connection of the electrical cabinet in the fixed electromagnetic station is of the nature of the busbar. Unless it is a special case, a large-scale power failure is not allowed. Therefore, the secondary side equipment of the handcart circuit breaker of the indoor fixed electromagnetic station fails. When maintenance is required, the handcart should be shaken after the brake is opened, and then the grounding knife should be operated to close. After the maintenance is completed, the grounding knife should be disconnected and the handcart should be shaken back. But in actual use, when the handcart circuit breaker is in the open state of the working position, the grounding knife can also be operated to close, and after the grounding knife is closed, there is no electrical lock with the closing circuit, that is, when the grounding knife is closed and the handcart is in the In the working position, the closing operation can still be realized. This is because when the electrical cabinet is used in the non-flood season in the mining area, the pump station needs to be moved frequently, and the power supply of the electrical cabinet can only be connected by a temporary column switch. When the power is cut off, an obvious breakpoint can be seen, and there is no need to shake the handcart. The situation is unique to the use of temporary sites in mines. It is different from the situation of fixed electromagnetic stations that are separated from the five defenses. The original five defenses cannot provide effective protection. It will cause the comprehensive protection device to trip or the line switch to trip. In severe cases, the electrical cabinet will be damaged, and the overhead line will fight or break. If there are pedestrians or vehicles passing under the line at this time, it is very likely to cause personal injury. But the consequences are more serious, even catastrophic.

Therefore, it is necessary to completely eliminate misoperation in this special environment, and realize effective electrical locking of the closing circuit when the circuit breaker is in the working position and the grounding knife is closed. In order to achieve comprehensive protection, some manufacturers have installed a micro switch that is insulated from the grounding knife and linked with it on the grounding knife of this type of electrical cabinet produced in recent years. When the grounding knife is closed, the micro switch is closed and the closing signal is sent to the The comprehensive protection device has not formed an effective lock, and needs to be further improved to ensure that all-round protection can still be achieved under the above-mentioned special working environment.

Contents of the invention

The purpose of the utility model is to provide a grounding locking device for preventing electric cabinets from being misoperated in extreme situations where the electric cabinets are used outdoors and often moved. The structure design is more reasonable, the use is more reliable, and the production cost is low.

The technical scheme of the utility model is:

A grounding locking device for an electric cabinet, comprising a comprehensive protection device arranged on the electric cabinet, the input ends of the comprehensive protection device are respectively connected to the closing pressure plate and the opening pressure plate on the operation panel of the electric cabinet, and the output terminals of the comprehensive protection device It is connected with the auxiliary contacts of the vacuum circuit breaker and the opening and closing coils, and the feature is that: the electric cabinet is also equipped with a micro switch and an AC contactor linked with the grounding knife switch, and a pair of micro switches The normally open and closing contact is connected in series with the coil of the AC contactor to form a closed circuit after being connected to the operating power supply of the electrical cabinet to take power. The normally closed contact of the AC contactor is connected in series with the closing pressure plate. After the contact is connected in series with the grounding indicator light, it is connected with the operating power supply of the electrical cabinet to take power to form a closed loop, and the grounding indicator light is installed on the operation panel of the electrical cabinet.

The beneficial effects of the utility model are:

This device sends the close signal of the grounding knife switch to the AC contactor through the linked micro switch. After the grounding knife switch is closed, the linked micro switch is closed at the same time to make the coil of the AC contactor energized and closed, and the contactor's The normally closed contact opens and disconnects the closing circuit, that is, disconnects the operating circuit passing through the closing pressure plate on the operation panel, that is, forms an effective lock with the closing circuit when the grounding knife is closed, and at the same time, the normally open contact of the AC contactor The point is closed, so that the grounding indicator light installed on the operation panel is energized and flashes to remind the operator. Thus, it can effectively prevent the misoperation of KYN28A-12﹙Z﹙high-voltage cabinet (equipped with Xuji Electric Comprehensive Protection) and other similar electrical cabinets when they are used outdoors and are often moved, ensuring the safety of related equipment and lines, and there are few changes. , less components are required, only one indicator light and one micro sequence contactor are used, which is economical and simple, and the maintenance is convenient and intuitive.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

As shown in Figure 1, the grounding locking device of the electrical cabinet includes the Xuji Electric Comprehensive Protection Device WGB-151N installed on the electrical cabinet, and the input terminals of the comprehensive protection device are respectively connected to the closing pressure plate LP1 on the operation panel of the electrical cabinet. It is connected with the opening pressure plate LP2, and the output end of the comprehensive protection device is connected with the auxiliary contact DL of the vacuum circuit breaker, the opening coil TQ, and the closing coil HQ. The electrical cabinet is also equipped with a micro switch k1 and an AC contactor k2 linked with the grounding knife switch. A pair of normally open and closing contacts of the micro switch k1 are connected in series with the coil of the AC contactor k2 and then connected to the electrical cabinet. The operating power supply is connected to take power to form a closed loop, the normally closed contact of the AC contactor k1 is connected in series with the closing pressure plate LP1, the normally open contact of the AC contactor k2 is connected in series with the grounding indicator HR and then connected to the The operating power supply is connected to take electricity to form a closed loop, and the grounding indicator HR is installed on the operation panel of the electrical cabinet.

In this embodiment, the AC contactor k2 adopts a miniature rail-type AC contactor with a coil pull-in voltage of 220V (same as the operating power supply in the cabinet), and is installed on the empty guide rail in the low-voltage cabinet of the electrical cabinet.

Claims (1)

1. a kind of electrical cabinet is grounded blocking device, including the complex protection device being set on electrical cabinet, the input terminal of the complex protection device It is connect respectively with the closing pressing plate on electrical cabinet operation panel and separating brake pressing plate, the output terminal of complex protection device is connected with vacuum The auxiliary contact of breaker and switching on and off coil, it is characterised in that：Be additionally provided in the electrical cabinet link with grounding switch it is micro- Dynamic switch and A.C. contactor, the normally opened moving together contact of a pair of the microswitch connect with the coil of A.C. contactor after with electricity The operation power connection of gas holder takes electric forming closed circuit, and the normally-closed contact of the A.C. contactor is connected with closing pressing plate, institute It is connect with the operation power of electrical cabinet electric forming is taken to be closed back after stating the normally opened contact of A.C. contactor and grounded signal lamp series connection Road, the grounded signal lamp are installed on the operation panel of electrical cabinet.