CN216355980U - Switch capable of being replaced in electrified mode - Google Patents

Abstract

The utility model discloses a switch capable of being replaced in a charged mode, which comprises a power supply, wherein the power supply is sequentially and electrically connected with a protection current transformer, a metering current transformer and a circuit breaker through a wire inlet end; a closing indicator lamp and a tripping indicator lamp are also connected in parallel between the wire inlet end and the wire inlet end, and the protection module comprises a standby circuit breaker; the utility model can realize the replacement of a new circuit breaker when the circuit breaker in operation is electrified, solves the problems of long on-site power failure time and low power consumption quality, and solves the potential hazards possibly caused by the circuit breaker working with diseases on site. The problem that the protection device is in protection loss in the battery replacement process is solved; the problem that the protection is in a vacuum non-action state in the battery replacement process, so that an abnormal problem is caused, and a more serious safety accident is avoided.

Description

Switch capable of being replaced in electrified mode

Technical Field

The utility model relates to a switch, in particular to a switch capable of being replaced in an electrified way, and belongs to the field of power equipment.

Background

At present, in the scheme of an electricity selling management device operating in a power grid, an operating circuit breaker fails or needs to be replaced by a new circuit breaker due to maintenance requirements, the process needs to be applied to a power company at first to determine the power failure time, then the new circuit breaker of a manufacturer and after-sales personnel are waited to arrive at the site for power failure replacement of the circuit breaker, the requirements are strict, the three cannot be completed once the three are lacked, and some circuit breakers are often in a fault work.

At present, in the technology of replacing a switch in a live state, a secondary winding of a current transformer is firstly short-circuited in a power replacement process, so that protection is in a vacuum misoperation state in the power replacement process, and more serious safety accidents can be possibly caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model discloses a switch capable of being replaced in a charged way, which is used for replacing a new breaker under the charged condition of a running breaker, solves the problems of long field power failure time and low power consumption quality, and solves the potential hazard possibly caused by the breaker working with a disease on the field; the problem of protection loss of a protection device in the battery replacement process is solved. The problem of the protection is in the vacuum no action state at the electricity changing in-process, unusual problem appears, leads to more serious incident.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

a switch capable of being replaced in a charged mode comprises a power supply, wherein the power supply is electrically connected with a protection current transformer, a metering current transformer and a circuit breaker in sequence through a wire inlet end, the circuit breaker is connected with a wire outlet end, and two ends of the circuit breaker are connected with a protection module in parallel; the protection module comprises an incoming line clamp and an outgoing line clamp, wherein the incoming line clamp is arranged between the metering current transformer and the circuit breaker, the outgoing line clamp is arranged between the circuit breaker and the outgoing line clamp, a standby circuit breaker is connected in series between the incoming line clamp and the outgoing line clamp, the standby circuit breaker is connected in series with a zero sequence current transformer, and the zero sequence current transformer is electrically connected with a current relay.

Furthermore, the public end of the standby circuit breaker is divided into three paths, the first path is connected with a closing button, the second path is connected with a tripping button, and the third path is connected with a normally open contact of a current relay; the switching-on end of the standby circuit breaker is sequentially connected with a switching-on button and a moving contact of a time relay to be electrically connected, the tripping end of the standby circuit breaker is divided into two paths, the first path is connected with the tripping button, and the second path is connected with a normally open contact of a current relay.

Furthermore, an intermediate relay coil is connected between the wire outlet end and the wire inlet end; the closing indicator lamp is connected in series with an intermediate relay normally-open contact, and the tripping indicator lamp is connected in series with an intermediate relay normally-closed contact.

Further, the tripping indicator lamp is connected with the time relay power coil in parallel.

Further, the wire inlet end is electrically connected with a current meter and a voltage meter.

The utility model has the following advantages:

1. through the setting of protection module, to the circuit breaker of in service renewal new circuit breaker under the electrified condition, solved on-the-spot power off time long, the not high situation of power consumption quality, solved the hidden danger that the circuit breaker of on-the-spot work with illness probably leads to.

2. Through the arrangement of the zero sequence current transformer, the problem that a protection device is in a protection missing state in the battery replacement process is solved, and the problem that the protection is in a vacuum non-action state in the battery replacement process, so that an abnormal problem occurs and a more serious safety accident is caused is avoided.

Drawings

Fig. 1 is a schematic diagram of a main circuit of a switch capable of being replaced with electricity according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of a control portion of a switch capable of being replaced with electricity according to an embodiment of the present invention.

Fig. 3 is a schematic circuit diagram of an error prevention portion of a switch capable of being replaced with electricity according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a zero sequence current loop in the embodiment of the present invention.

Detailed Description

The structure of a switch capable of being replaced with electricity in the present invention is specifically described below with reference to the accompanying drawings 1 to 4 of the specification. The last digit of a reference number in an embodiment of the utility model represents a certain part of the component.

The switch capable of being replaced in a charged mode comprises a power supply, wherein the power supply is sequentially and electrically connected with a protection current transformer TH, a metering current transformer TA and a breaker QF through a wire inlet end, and the breaker QF is connected with a wire outlet end. And two ends of the breaker QF are connected with a protection module in parallel.

The protection module comprises an incoming line wire clamp arranged between a metering current transformer TA and a breaker QF and an outgoing line wire clamp arranged between the breaker QF and an outgoing line end, a standby breaker QF0 and a zero sequence current transformer TA0 are connected in series between the incoming line wire clamp and the outgoing line wire clamp, the zero sequence current transformer TA0 is electrically connected with a current relay 2KA, when a current relay coil 2KA1 is attracted, a normally open contact 2KA2 of the current relay is closed, a tripping circuit is connected, and the breaker QF0 is disconnected.

As shown in fig. 2, the common end COM of the standby breaker QF0 is divided into three paths, the first path is connected with a closing button SBC, the second path is connected with a tripping button SBS1, the third path is connected with a current relay normally open contact 2KA2, a closing end HQ of the standby breaker QF0 is sequentially connected with the closing button SBC and a time relay moving contact KT2 to be electrically connected, a tripping end TQ of the standby breaker QF0 is divided into two paths, the first path is connected with a tripping button SBS1, and the second path is connected with the current relay normally open contact 2KA 2.

An intermediate relay coil 1KA1 is connected between the A-phase outlet terminal and the N-phase inlet terminal; a closing indicator lamp HR and a tripping indicator lamp HG are connected in parallel between the A-phase line inlet end and the N-phase line inlet end, the closing indicator lamp HR is connected in series with an intermediate relay normally-open contact 1KA2, the tripping indicator lamp HG is connected in series with an intermediate relay normally-closed contact 1KA3, the line outlet end of the breaker is electrified when the breaker QF is switched on, the intermediate relay coil 1KA1 is attracted, then the intermediate relay normally-open contact 1KA2 is closed, the loop is switched on, the closing indicator lamp is on, the tripping indicator lamp HG is connected with the time relay power supply coil 1 in parallel, the line outlet end of the breaker is electrified when the breaker QF is switched off, the intermediate relay coil 1KA1 is not electrified and disconnected, then the intermediate relay normally-closed contact 1KA3 is closed, the loop is switched on, the closing indicator lamp is on, the time relay power supply 1 is electrified, and preparation is made for later-stage power failure delay.

And (3) battery replacement work flow:

under the condition that the standby switch box is in tripping, namely the tripping indicator lamp HG is on, the closing indicator lamp HR is not on, a plurality of wire incoming clamps and a plurality of wire outgoing clamps are additionally arranged on nodes of the breaker QF needing to be replaced, which are close to the ends of the wire incoming end and the wire outgoing end of the switch respectively, and the surfaces of the wire clamps are provided with voltage-resistant and insulating silicon rubber.

The standby circuit breaker QF0 is switched on, a switch-on button SBC is pressed on a control panel of the standby switch box, the trip indicator light HG is turned off, the switch-on indicator light HR is turned on, and at the moment, current in a loop is shunted from an incoming line end through the circuit breaker QF and the standby circuit breaker QF0 and then is collected to an outgoing line end.

After the circuit is stabilized, the circuit breaker QF is tripped, at the moment, the current in the circuit completely flows to the wire outlet end from the wire inlet end through the circuit breaker (an electric operating mechanism) QF0, the fixing screws of the circuit breaker QF and the cable connector are detached, and the detached wire inlet end and the wire outlet end are subjected to color separation and are wrapped by insulating silicon rubber.

After the breaker QF is detached, a multimeter is adopted to measure that the main loop is in a disconnected state, a new breaker QF1 is installed, the silicon rubber of the inlet wire end and the outlet wire end is loosened respectively, the new breaker QF1 is screwed with the fixing screw of the cable joint, then the new breaker QF1 is switched on, and at the moment, the current in the loop is shunted from the inlet wire end through the new breaker QF1 and the new breaker QF0 and then is collected to the outlet wire end.

Tripping the standby circuit breaker QF0, turning on the trip indicator light HG, turning off the closing indicator light HR, loosening the wire clamp and completing the replacement of the circuit breaker QF under the electrified state.

Further, because the zero sequence current transformer TA0 is added in the circuit, even if a false operation occurs, the coil 2KA1 of the current relay is electrified, so that the normally open contact of the current relay 2KA2 is closed, the standby circuit breaker QF0 is tripped, the main circuit runs normally at the moment, the power supply can be ensured to be normal, and a safety accident can not occur.

Further, at the moment of tripping, the standby breaker QF0 turns on the trip indicator light, so that the time relay power coil KT1 is powered. Meanwhile, the normally open contact SBS2 of the trip button is changed from normally open to normally closed and then is normally open from normally closed, the time relay collects signals KT3, and the normally closed change normally open signals of the trip button SBS are collected, so that a moving contact KT2 of the time relay is always kept in a normally open state, even if the spare circuit breaker QF0 is tripped and then the SBC is pressed to be switched on, a switching-on loop is still disconnected, and the mistaken switching-on and switching-off actions are guaranteed.

Electrified body has been touched to the health mistake in the operation process, and zero sequence current transformer TA0 receives leakage signal for current relay 2KA1 gets electricity, and current relay normally open contact 2KA2 is by normally opening the normal close, and the tripping circuit switch-on makes circuit breaker QF0 disconnection, and this in-process, the tripping indicator is bright, makes time relay power coil KT1 get electricity. Meanwhile, the normally closed contact 2KA3 of the current relay is normally opened from a normally closed state, the time relay acquisition signal KT3 enables the time relay moving contact KT2 to always keep a normally open state through collecting a normally closed and normally open signal of the normally closed contact 2KA3 of the current relay, even if the breaker QF0 is tripped and then the brake closing button SBC is pressed to close a brake, a brake closing loop is still disconnected, and the mistaken opening and closing action is guaranteed.

Furthermore, after the wire clamp is installed, a voltmeter V1/V2/V3 and an ammeter A1/A2/A3 are arranged at a wire inlet end to read a voltage value and a current value in a circuit, and the standby switch box has the functions of detecting the voltage and the current of the circuit and the like, so that the electricity consumption quality condition of the circuit can be analyzed.

Claims (5)

1. A switch capable of being replaced in a charged mode is characterized by comprising a power supply, wherein the power supply is electrically connected with a protection current transformer, a metering current transformer and a circuit breaker in sequence through a wire inlet end; the protection module comprises an incoming line clamp and an outgoing line clamp, wherein the incoming line clamp is arranged between the metering current transformer and the circuit breaker, the outgoing line clamp is arranged between the circuit breaker and the outgoing line clamp, a standby circuit breaker is connected in series between the incoming line clamp and the outgoing line clamp, the standby circuit breaker is connected in series with a zero sequence current transformer, and the zero sequence current transformer is electrically connected with a current relay.

2. The live replaceable switch of claim 1, wherein the common terminal of the backup breaker is divided into three paths, a first path is connected with a closing button, a second path is connected with a trip button, and a third path is connected with a normally open contact of a current relay; the switching-on end of the standby circuit breaker is sequentially connected with a switching-on button and a moving contact of a time relay to be electrically connected, the tripping end of the standby circuit breaker is divided into two paths, the first path is connected with the tripping button, and the second path is connected with a normally open contact of a current relay.

3. The hot-line replaceable switch of claim 1, wherein an intermediate relay coil is connected between the outlet terminal and the inlet terminal; the closing indicator lamp is connected in series with an intermediate relay normally-open contact, and the tripping indicator lamp is connected in series with an intermediate relay normally-closed contact.

4. The hot swap switch of claim 1, wherein the trip indicator light is connected in parallel with the time relay power coil.

5. The hot-line replaceable switch of claim 1, wherein the inlet line terminal is electrically connected to a current meter and a voltage meter.

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