CN215728643U

CN215728643U - Closing circuit monitoring device

Info

Publication number: CN215728643U
Application number: CN202120630926.4U
Authority: CN
Inventors: 陈小瓦; 李本瑜; 石恒初; 施蔚青
Original assignee: Yunnan Power Grid Co Ltd
Current assignee: Yunnan Power Grid Co Ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2022-02-01
Anticipated expiration: 2031-03-29

Abstract

The utility model relates to a closing circuit monitoring device, which comprises a post-closing position relay, a signal indicator lamp, a voltage dividing resistor, a protective resistor and a wiring terminal, wherein the closing circuit monitoring device adopts a metal shell; the power supply anode DC + is connected with a divider resistor, the other end of the divider resistor is connected with a protective resistor, the protective resistor is connected with a signal indicator lamp in parallel, the other end of the protective resistor is connected with a post-closing position relay, and the post-closing position relay is connected with the power supply cathode DC-. And two ends of a normally closed contact of the closed position relay are respectively connected to two signal power supply ends. The problem that the integrity of a closing loop cannot be monitored in the closing state is solved, and then the safety monitoring and prevention control are carried out on the closing loop, so that the success rate of reclosing and the reliability of power supply are improved.

Description

Closing circuit monitoring device

Technical Field

The utility model belongs to the industries of power production and the like, and particularly relates to a closing circuit monitoring device.

Background

At present, a circuit breaker control loop is provided with a perfect tripping and closing monitoring loop and a corresponding indicator light, for example, when the circuit breaker is at a switching-on position, the switching-on indicator light is lightened, a switching-on position relay is connected in the tripping loop to monitor the tripping loop, and if the indicator light is not lightened, the fault of the tripping loop is indicated. When the breaker is at a tripping position, the tripping indicating lamp is lightened, the tripping position relay is connected in the closing circuit to monitor the closing circuit, and if the indicating lamp is not lightened, the fault of the closing circuit is indicated.

Therefore, in the current design mode, when the circuit breaker normally operates, effective monitoring of the closing circuit can be achieved in the open position state, and effective monitoring of the opening circuit can be achieved in the closed position state. However, the circuit breaker generally operates at a switching-on position for a long time, the existing protection measurement and control device can only monitor a tripping circuit, but cannot monitor whether the switching-on circuit is normal or not. At this time, the fault of the closing circuit cannot be discovered. If any one of a remote/local switching handle, a breaker tripping-prevention relay contact, a low-pressure latching relay contact, an energy storage stroke contact and a closing coil in a closing loop has a fault or is in poor contact, the final result is that reclosing fails, a circuit is tripped forever, and the reliability of power supply is influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a closing circuit monitoring device to solve the problems in the prior art.

The technical scheme is as follows:

a closing circuit monitoring device comprises a post-closing position relay, a signal indicator lamp, a voltage dividing resistor, a protective resistor and a wiring terminal, wherein the closing circuit monitoring device adopts a metal shell; the power supply anode DC + is connected with a divider resistor, the other end of the divider resistor is connected with a protective resistor, the protective resistor is connected with a signal indicator lamp in parallel, the other end of the protective resistor is connected with a post-closing position relay, and the post-closing position relay is connected with the power supply cathode DC-. Two ends of a normally closed contact of the closed position relay are respectively connected to the positive end and the negative end of the signal power supply.

Further, the positive power supply DC + is separated from the positive signal terminal S + and the negative power supply DC-is separated from the negative signal terminal S-.

Further, the power supply adopts a 110V direct current power supply

Further, when a closing loop is intact, the signal indicator lamp is turned on. When the closed position monitoring circuit is disconnected, the signal indicator lamp is turned off, the normally closed contact of the closed position relay is closed, and a closed circuit disconnection signal is sent to the management unit.

Compared with the prior art, the utility model has the following beneficial effects:

the closing circuit monitoring device solves the problem that the integrity of a closing circuit cannot be monitored when the circuit breaker is in a closing state, and then safety monitoring and prevention and control are carried out on the closing circuit, so that the success rate of reclosing and the reliability of power supply are improved.

Drawings

Fig. 1 is a schematic structural diagram of a closing circuit monitoring device according to the present invention;

FIG. 2 is a schematic diagram of post-closure position monitoring loop signaling logic of the present invention.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples without making any creative effort, shall fall within the protection scope of the present invention.

Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art. The use of "first," "second," and similar terms in the present embodiments does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "Upper," "lower," "left," "right," "lateral," "vertical," and the like are used solely in relation to the orientation of the components in the figures, and these directional terms are relative terms that are used for descriptive and clarity purposes and that can vary accordingly depending on the orientation in which the components in the figures are placed.

When the breaker is at the closing position, the auxiliary contact of the breaker is connected in series in the closing loop, and at the moment, the contact is disconnected, so that monitoring cannot be carried out.

As shown in fig. 1, the closing circuit monitoring device of the present embodiment includes a post-closing position relay 10, a signal indicator lamp 11, a voltage dividing resistor 12, a protection resistor 13, and a connection terminal, and the closing circuit monitoring device is made of a metal case. The power supply positive pole DC + is connected with a voltage dividing resistor 12, the other end of the voltage dividing resistor 12 is connected with a protection resistor 13, the protection resistor 13 is connected with a signal indicator lamp 11 in parallel, the other end of the protection resistor 13 is connected with a post-closing position relay 10, the post-closing position relay 10 is connected with a power supply negative pole DC-, and two ends of a normally closed contact of the post-closing position relay 10 are respectively connected with the positive end and the negative end of a signal power supply.

Furthermore, the positive supply pole DC + is separated from the positive signal terminal S +, and the negative supply pole DC-is separated from the negative signal terminal S-.

The power supply adopts a 110V direct current power supply; the post-closing position relay 10 is used for sending a warning signal for switching off a closing circuit when the circuit breaker is at a closing position; the protective resistor 13 is used for indicating the protection of the signal lamp 11; the voltage dividing resistor 12 is used for loop voltage division; the indication signal lamp 11 is used for marking the on-off state of the loop, and when 110V control power supply is applied between the positive pole DC + of the power supply and the negative pole DC-of the power supply, the indication lamp is on.

As shown in fig. 1, the actuating coil of the post-closing position relay 10 is connected in parallel to the closing loop, and the connection point is at the remote/local transfer switch, and the rear is connected in series with the circuit breaker energy storage stroke contact, the closing coil, and the low-pressure latching relay contact. The circuit breaker auxiliary switch contacts advance in front of the remote/local diverter switch. When the breaker is in the closed position, the closing coil is electrified.

The closed position relay is a voltage coil, the resistance of the coil is larger, and the resistance of the whole relay is about 40k omega by adding the resistor connected in series on the loop. Because the tripping and closing coil of the existing circuit breaker is of a current type, the resistance value of the tripping and closing coil is small and is usually 50-200 omega. Although the whole closing loop is conducted, most of the control loop voltage is applied to the closed position relay 10, and the resistance of the closed position relay 10 is large, so that the current is small, and the action of a closing coil is not enough. The resistor connected in series with the coil of the closed position relay 10 is also used for preventing the coil of the closed position relay from breaking down and short-circuiting to cause misoperation of the closed coil. When the switching-on is carried out in a superposition or remote control mode, the switching-on of the switching-on loop is equivalent to that the relay 10 at the position after switching-on is directly in short circuit, and voltage is directly applied to the switching-on coil to enable the coil to act.

The circuit can effectively monitor the closing circuit in the circuit breaker mechanism except the circuit breaker auxiliary contact, the circuit breaker auxiliary contact has high operation reliability and is connected in parallel by two pairs of contacts, and therefore the improvement measure can greatly improve the success rate of reclosing.

When the post-closing position monitoring circuit is disconnected, the normally closed contact of the post-closing position relay 10 is closed, and a closing circuit disconnection signal is transmitted to the management unit, as shown in fig. 2.

The device can monitor the integrity of a closing loop and can realize the following functions:

(1) when the circuit breaker is in the closed position, providing an indication of the intact state of a closing loop of the circuit breaker;

(2) when the breaker is closed, any one of the remote/local transfer switch, the energy storage stroke contact of the breaker, the closing coil and the low-pressure latching relay contact is disconnected, and a breaking signal of a closing loop of the breaker is provided.

The utility model provides a closing circuit monitoring devices outside "red" lamp of closing circuit, the "green" lamp return circuit in tripping circuit, newly increases a reclosing circuit and detects with "yellow" lamp return circuit, and the difference is independent operation, each other noninterference. And a normally closed contact of the closed position relay is connected to the measurement and control device, and the loop is used for sending a monitoring signal of the running state.

In addition, A, B, C three yellow indicator lamps in three phases are added to a panel of the existing circuit breaker operation box (one yellow indicator lamp is added to the three-phase integrated operation box), a closing circuit is monitored in the closing state of the circuit breaker, and the circuit breaker operation box also belongs to the protection scope of the patent. In addition, the post-closing position relay shown in fig. 1 may be named as a reclosing position relay CHWJ, and three additional cable cores of the existing circuit breaker control circuit are connected to the primary circuit breaker mechanism box for monitoring the newly added reclosing position relay CHWJ (one additional cable core is added for the three phases), which also belongs to the protection scope of this patent. In order to prevent the normally closed contact of the reclosing position relay CHWJ from closing and continuously send a warning signal of the disconnection of the closing circuit when the circuit breaker is in the open state, the normally open contact of the trip position relay TWJ is connected in series before/after the normally closed contact, and the protection scope of the present patent is also included. In addition, in order to avoid that a newly-added 'yellow' lamp for a reclosing detection loop is still lighted when the circuit breaker is disconnected, an auxiliary normally-open contact of the circuit breaker is added in series in the loop, and the protection range of the patent also belongs to.

The present invention is not limited to the specific details of the above-described embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. The various features described in the foregoing detailed description may be combined in any suitable manner without departing from the scope of the utility model. The utility model is not described in detail in order to avoid unnecessary repetition.

Claims

1. A closing circuit monitoring device is characterized in that: the device comprises a post-closing position relay (10), a signal indicator lamp (11), a voltage dividing resistor (12), a protective resistor (13) and a wiring terminal; the power supply anode DC + is connected with a divider resistor (12), the other end of the divider resistor (12) is connected with a protective resistor (13), the protective resistor (13) is connected with a signal indicator lamp (11) in parallel, the other end of the protective resistor (13) is connected with a post-closing position relay (10), the post-closing position relay (10) is connected with the power supply cathode DC-, and two ends of a normally closed contact of the post-closing position relay (10) are respectively connected with the positive end and the negative end of a signal power supply.

2. The closing circuit monitoring device according to claim 1, wherein: the positive power supply DC + is separated from the positive signal terminal S + and the negative power supply DC-is separated from the negative signal terminal S-.

3. The closing circuit monitoring device according to claim 1, wherein: the power supply is a 110V direct current power supply.

4. The closing circuit monitoring device according to claim 1, wherein: when the closing loop is intact, the signal indicator lamp (11) is lighted.

5. When the closed position monitoring circuit is disconnected, the signal indicator lamp (11) is turned off, the normally closed contact of the closed position relay (10) is closed, and a closed circuit disconnection signal is sent to the management unit.