CN105552769A - Control circuit for multifunctional electricity-verification and grounding trolley for centrally installed switchgear - Google Patents

Abstract

The invention discloses a control circuit for a multifunctional electricity-verification and grounding trolley for centrally installed switchgear. The control circuit comprises a cabinet-in/out control circuit for controlling the trolley to go in and go out of the cabinet electrically, and an electricity-verification and grounding circuit used for controlling the trolley to perform electricity-verification and grounding, and controlling an earthing switch to be electrically switched off. The control circuit is convenient and safe to operate; due to the reliable operation of the grounding trolley, safety to maintenance staff is ensured, the probability of unplanned outage can be effectively lowered, higher power supply reliability is provided for users, and economic benefit is brought for consumers indirectly, so that the social credibility and recognition degree of the power system operation can be improved consequently.

Description

The control circuit of the multi-functional electric test and grounding trolley in the central cabinet

This application is a divisional application with application number: 201410341290.6, application date: 2014.07.18, and name "Multi-function electrical inspection of central cabinet, operation method of grounding trolley".

technical field

The invention relates to an operation method of a multi-functional electric testing and grounding trolley with a central cabinet.

Background technique

In recent years, metal-enclosed air-insulated switchgear has been widely used in substations with voltage levels of 550kV, 220kV and below in power systems and other industrial user substations. Switchgear also came into being. Among them, for the convenience and safety of maintenance, the grounded handcart is one of the essential handcart equipment. Its purpose is to prevent electric shock accidents caused by wrong power transmission or misoperation of switchgear during maintenance. At present, the widely used grounding handcart is composed of three simple contact arms, a grounding bus bar, and a plum blossom contact finger for connecting with the static grounding contact in the cabinet.

The disadvantage of the existing products is that it is safe and reliable to push the handcart in only when the incoming busbar is not charged. It does not have the function of detecting whether the busbar is live. Or an electric interlocking device restricts it from continuing to push in, that is, once the handcart is pushed in, an instantaneous grounding short circuit accident will occur. Pushing into the grounding handcart under electrified conditions will generate a large short-circuit electric force. In this case, a large electric thrust may repel the handcart, and at this time, the electric repulsion may force the grounded handcart to retreat and crush or injure the maintenance personnel. Moreover, at the moment when the grounding handcart is driven away by the electric force, the space gap between the plum blossom contact and the high-voltage static contact on the handcart is broken down and arced. It is very likely to cause arc burns to the staff or cause arc fire accidents.

It can be seen that in the live situation, pushing the grounded handcart to cause personal injury and property loss is an inevitable safety accident.

Contents of the invention

The object of the present invention is to provide a control circuit of a central cabinet with a multi-functional electrical inspection and grounding trolley that can effectively ensure the safety of the handcart operation.

Technical solution of the present invention is:

A method for operating a multi-functional electric inspection and grounding trolley in a central cabinet, characterized in that: the electric entry and exit of the handcart are controlled by the control circuit for entering and exiting the cabinet, and the electric inspection and grounding of the handcart, and the electric opening of the grounding switch have inspection Electric grounding circuit control; the control circuit for entering and exiting the cabinet includes a motor M2 that drives the movement of the dolly, and the power supply line of the motor M2 is provided with main contacts that control the work of the motor M2, the parallel contactor KM3, and the contactor KM4, and the power supply line is connected with Switch S1, switch S1 is connected with a parallel control circuit, a line routing button SB3 in the parallel control circuit and a parallel structure of an auxiliary contact of contactor KM3 and a contact of contactor KM4, contactor KM3, switch S9 Composed in series, another route routing button SB4 in the parallel control circuit and an auxiliary contact structure of the contactor KM4 are connected in series with a contact of the contactor KM3, the contactor KM4, and the switch S8; The circuit includes the motor M1, the power supply line of the motor M1 is set to control the operation of the motor M2, the parallel contactor KM1, the main contact of the contactor KM2, the auxiliary contact HN is connected to the power supply line, and a switch is connected to one end of the auxiliary contact HN The parallel device of S8 and switch S9, the other end of the auxiliary contact HN is connected with a parallel control circuit, the parallel structure of a line routing button SB1 in the parallel control circuit and an auxiliary contact of the contactor KM1 is connected with the contactor KM2 A contact, a contactor KM1, and a switch S1 are composed in series, and another route in the parallel control circuit is a parallel structure of the button SB2 and an auxiliary contact of the contactor KM2, and a contact of the contactor KM1, the contactor KM2, The switch S2 is connected in series;

Electric handcart into the cabinet:

The grounding switch is in the opening position, the switch S1 is turned on, the handcart is in the test position, the switch S9 is turned on, press the button SB3 into the cabinet, the coil of the contactor KM3 is energized, the main contact of the contactor is turned on, and the motor M2 is energized , the handcart starts to swing into the cabinet, release the button SB3 at this time, the contactor is self-holding through the KM3 auxiliary contact, when the handcart reaches the working position, the switch S9 is turned off, the coil of the contactor KM3 is de-energized, and the main contact is disconnected , the motor M2 stops working, and the operation of entering the cabinet is completed;

Electric handcart out of the cabinet:

The grounding switch is in the opening position, the switch S1 is turned on, the handcart is in the working position, the switch S8 is turned on, and the button SB4 is pressed to get out of the cabinet, the coil of the contactor KM4 is energized, and the main contact of the contactor is connected, which is the same as when entering the cabinet. The motor power is reversed, the motor M2 is energized, and the handcart starts to shake out of the cabinet. At this time, release SB4, and the contactor is self-maintained through the KM4 auxiliary contact. When the handcart reaches the test position, the switch S8 is disconnected, and the contactor KM4 coil When the power is lost, the main contact is disconnected, the motor M2 stops working, and the operation of coming out of the cabinet is completed.

Electrical grounding operation:

When the handcart is in the working position, the switch S9 is turned on, when the handcart is in the test position, the switch S8 is turned on, the primary circuit is fed back to the charged display according to the high voltage sensor, the primary circuit is not charged, the auxiliary contact HN is closed, and the grounding switch is in the open state. The switch S1 is turned on, press the button SB1 closing button, the coil of the contactor KM1 is energized, the main contact of the contactor is turned on, the motor M1 is energized, and the grounding switch starts to close. At this time, release SB1, and the contactor is assisted by KM1. The contact is self-holding, when the grounding switch is closed, the switch S1 is disconnected, the coil of the contactor KM1 is de-energized, the main contact is disconnected, the motor M1 stops working, and the grounding operation of the electric test is completed;

Electric opening of the grounding switch:

When the handcart is in the working position, S9 is turned on, when the handcart is in the test position, the switch S8 is turned on, the primary circuit is not charged, the auxiliary contact HN is turned on, the grounding switch is in the closed state, the switch S2 is turned on, press the button SB2 Close button, the KM2 coil of the contactor is energized, the main contact of the contactor is connected, the motor M1 is energized, and the grounding switch starts to close. At this time, the button SB2 is released, the contactor is self-maintained through the KM2 auxiliary contact, and the grounding switch is opened. When the brake is in place, the switch S2 is disconnected, the coil of the contactor KM2 is de-energized, the main contact is disconnected, the motor M1 stops working, and the opening operation of the grounding switch is completed.

The invention is convenient and safe to operate. The reliable work of the grounding handcart can not only bring safety to the maintenance personnel, but also effectively reduce the probability of unplanned power outages, provide users with higher reliability of power supply, and indirectly bring economic benefits to customers, thus providing power for the power system. Operation improves social credibility and recognition.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

Fig. 1 is the control circuit diagram of the cabinet of the present invention.

Fig. 2 is the electrical test grounding circuit diagram of the present invention.

detailed description

An operation method of a multi-function electric inspection and grounding trolley with a central cabinet, the electric entry and exit of the handcart are controlled by the control circuit for entering and exiting the cabinet, the electric inspection grounding of the handcart, and the electric opening of the grounding switch is controlled by the electric inspection grounding circuit The control circuit for entering and exiting the cabinet includes a motor M2 that drives the movement of the dolly, and the power supply line of the motor M2 is provided with the main contact of the control motor M2 work, parallel contactor KM3, and contactor KM4, and the power supply line is connected with a travel switch S1, The travel switch S1 is connected with a parallel control circuit, the parallel structure of a routing button SB3 in the parallel control circuit and an auxiliary contact of the contactor KM3 is connected in series with a contact of the contactor KM4, the contactor KM3 and the travel switch S9 Composition, another route routing button SB4 in the parallel control circuit and a parallel structure of an auxiliary contact of the contactor KM4 are connected in series with a contact of the contactor KM3, the contactor KM4, and the travel switch S8; The circuit includes the motor M1, the power supply line of the motor M1 is set to control the operation of the motor M2, the parallel contactor KM1, the main contact of the contactor KM2, the power supply line is connected with the auxiliary contact HN, and one end of the auxiliary contact HN is connected with the stroke The parallel device of switch S8 and travel switch S9, the other end of the auxiliary contact HN is connected with a parallel control circuit, and a line in the parallel control circuit is connected with the parallel structure of the button SB1 and an auxiliary contact of the contactor KM1 and the contactor A contact of KM2, contactor KM1, and travel switch S1 are connected in series. Another route in the parallel control circuit is a parallel structure of button SB2 and an auxiliary contact of contactor KM2 and a contact of contactor KM1. The device KM2 and travel switch S2 are connected in series;

Electric handcart into the cabinet:

The grounding switch is in the opening position, the travel switch S1 is connected, the handcart is in the test position, the travel switch S9 is connected, press the button SB3 to enter the cabinet, the coil of the contactor KM3 is energized, the main contact of the contactor is connected, and the motor M2 When the power is on, the handcart starts to swing into the cabinet. At this time, the button SB3 is released, and the contactor is self-maintained through the KM3 auxiliary contact. The head is disconnected, the motor M2 stops working, and the operation of entering the cabinet is completed;

Electric handcart out of the cabinet:

The grounding switch is in the opening position, the travel switch S1 is connected, the handcart is in the working position, the travel switch S8 is connected, and the button SB4 is pressed to get out of the cabinet, the coil of the contactor KM4 is energized, and the main contact of the contactor is connected. When the cabinet is in the cabinet, the motor power is reversed, the motor M2 is energized, and the handcart starts to shake out of the cabinet. At this time, release SB4, and the contactor is self-maintained through the KM4 auxiliary contact. The KM4 coil of the switch is de-energized, the main contact is disconnected, the motor M2 stops working, and the operation of coming out of the cabinet is completed.

Electrical grounding operation:

When the handcart is in the working position, the travel switch S9 is turned on, when the handcart is in the test position, the travel switch S8 is turned on, the primary circuit is fed back to the charged display according to the high voltage sensor, the primary circuit is not charged, the auxiliary contact HN is closed, and the grounding switch is in the open state state, the limit switch S1 is turned on, press the button SB1 closing button, the contactor KM1 coil is energized, the contactor main contact is turned on, the motor M1 is energized, the grounding switch starts to close, at this time release SB1, the contactor Through the self-holding of the KM1 auxiliary contact, the travel switch S1 is disconnected when the grounding switch is in place, the coil of the contactor KM1 is de-energized, the main contact is disconnected, the motor M1 stops working, and the grounding operation of the electric test is completed;

Electric opening of the grounding switch:

The travel switch S9 is turned on when the handcart is in the working position, and the travel switch S8 is turned on when the handcart is in the test position, the primary circuit is not charged, the auxiliary contact HN is connected, the grounding switch is in the closed state, and the travel switch S2 is turned on. Press the button SB2 to close the switch, the contactor KM2 coil is energized, the main contact of the contactor is connected, the motor M1 is energized, and the grounding switch starts to close. At this time, the button SB2 is released, and the contactor is self-maintained through the KM2 auxiliary contact. , When the grounding switch is in place, the travel switch S2 is disconnected, the coil of the contactor KM2 is de-energized, the main contact is disconnected, the motor M1 stops working, and the grounding switch is closed.

Claims (1)

1. A control circuit for a multifunctional electric test and grounding trolley in a central cabinet, characterized in that: the control circuit includes a control circuit for controlling the electric entry and exit of the handcart into and out of the cabinet, and controls the electric test grounding and grounding of the handcart. The electrical inspection grounding circuit of the electric opening of the switch; the control circuit for entering and exiting the cabinet includes a motor M2 that drives the movement of the trolley, and the main contacts of the parallel contactor KM3 and the contactor KM4 that control the work of the motor M2 are set on the power supply line of the motor M2, The travel switch S1 is connected to the power supply line, and the travel switch S1 is connected to a parallel control circuit. A line in the parallel control circuit is connected with a parallel structure of the button SB3 and an auxiliary contact of the contactor KM3 and a contact of the contactor KM4. , contactor KM3, and travel switch S9 in series, another route in the parallel control circuit is a parallel structure of the routing button SB4 and an auxiliary contact of contactor KM4, and a contact of contactor KM3, contactor KM4, travel switch S8 is connected in series; the electric test grounding circuit includes a motor M1, the main contacts of a parallel contactor KM1 and a contactor KM2 that control the work of the motor M1 are set on the power supply line of the motor M1, and the power supply line is connected with an auxiliary contact HN, One end of the auxiliary contact HN is connected with a travel switch S8 and a parallel device of the travel switch S9, and the other end of the auxiliary contact HN is connected with a parallel control circuit, and a line in the parallel control circuit is connected to an auxiliary switch SB1 and a contactor KM1. The parallel structure of contacts is composed of a contact of contactor KM2, contactor KM1 and travel switch S1 in series. Another route in the parallel control circuit is the parallel structure of button SB2 and an auxiliary contact of contactor KM2. One contact of device KM1, contactor KM2 and travel switch S2 are connected in series; Electric handcart into the cabinet: The grounding switch is in the opening position, the travel switch S1 is connected, the handcart is in the test position, the travel switch S9 is connected, press the button SB3 to enter the cabinet, the coil of the contactor KM3 is energized, the main contact of the contactor is connected, and the motor M2 When the power is on, the handcart starts to swing into the cabinet. At this time, the button SB3 is released, and the contactor is self-maintained through the KM3 auxiliary contact. The head is disconnected, the motor M2 stops working, and the operation of entering the cabinet is completed; Electric handcart out of the cabinet: The grounding switch is in the opening position, the travel switch S1 is connected, the handcart is in the working position, the travel switch S8 is connected, and the button SB4 is pressed to get out of the cabinet, the coil of the contactor KM4 is energized, and the main contact of the contactor is connected. When the cabinet is in the cabinet, the motor power is reversed, the motor M2 is energized, and the handcart starts to shake out of the cabinet. At this time, release SB4, and the contactor is self-maintained through the KM4 auxiliary contact. The KM4 coil of the switch is de-energized, the main contact is disconnected, the motor M2 stops working, and the operation of coming out of the cabinet is completed; Electrical grounding operation: When the travel switch S9 is turned on when the handcart is in the working position, and when the travel switch S8 is turned on when the handcart is in the test position, the primary circuit is fed back to the electrified display according to the high-voltage sensor, the primary circuit is not charged, the auxiliary contact HN is closed, and the grounding switch is at In the opening state, the limit switch S1 is turned on, press the button SB1 to close the switch, the coil of the contactor KM1 is energized, the main contact of the contactor is turned on, the motor M1 is energized, and the grounding switch starts to close. At this time, release SB1 , the contactor is self-maintained through the KM1 auxiliary contact. When the grounding switch is closed and in place, the travel switch S1 is disconnected, the coil of the contactor KM1 is de-energized, the main contact is disconnected, the motor M1 stops working, and the grounding operation of the electric test is completed; Electric opening of the grounding switch: When the handcart is in the working position S9 is connected, when the handcart is in the test position, the travel switch S8 is connected, the primary circuit is not charged, the auxiliary contact HN is connected, the grounding switch is in the closing state, the travel switch S2 is connected, press Press the button SB2, the coil of the contactor KM2 is energized, the main contact of the contactor is connected, the motor M1 is energized, and the grounding switch starts to open. At this time, the button SB2 is released, the contactor is self-maintained through the auxiliary contact of KM2, and the grounding switch is opened. When it is in place, the travel switch S2 is disconnected, the coil of the contactor KM2 is de-energized, the main contact is disconnected, the motor M1 stops working, and the opening operation of the grounding switch is completed.