CN207541171U - Miniature simulation circuit breaker - Google Patents

Abstract

The utility model provides a miniature analog circuit breaker, which includes a plurality of opening and closing circuits with the same structure. The opening and closing circuits include a closing relay K1, an opening relay K2, a first resistor R1 and a second resistor R2. Use the opening relay and closing relay to simulate the opening and closing action of the real circuit breaker, which is consistent with the action of the real circuit breaker. Resistors R1 and R2 are used to form a series circuit with the normally open and normally closed points of the closing relay K1. When the comprehensive protection is in the closing and opening monitoring state, a monitoring circuit is formed with the comprehensive protection signal terminal for monitoring closing and closing. Open state. As the signal output terminal of the comprehensive protection device, a simple control circuit is used to replace the real circuit breaker action, and the function of verifying the comprehensive protection equipment is realized. It can improve the acceptance quality of substation comprehensive protection renovation and shorten the acceptance period.

Description

A miniature analog circuit breaker

technical field

The utility model relates to the technical field of power supply and distribution, in particular to a miniature analog circuit breaker.

Background technique

The same type of domestic substation comprehensive protection renovation process has encountered the problems of tight acceptance period and heavy workload. The basic steps of retrofit acceptance include: power outage wiring of related equipment, protection device test, signal transmission, point-to-point dispatching and centralized control system, etc. In order to improve the quality of comprehensive security retrofit acceptance and shorten the acceptance period, the "miniature analog circuit breaker" is used to simulate the operation of equipment. "Actual circuit breaker", device test, signal transmission, and point-to-point dispatching centralized control system are carried out in advance, and these items are tested before the relevant equipment is powered off.

Contents of the invention

In order to solve the problems mentioned in the background technology, the utility model provides a miniature analog circuit breaker, which is used for the simulation equipment test of the comprehensive protection device, and as the signal output terminal of the comprehensive protection device, a simple control circuit is used to replace the real circuit breaker The action realizes the function of verifying the comprehensive protection equipment. It can improve the acceptance quality of substation comprehensive protection transformation and shorten the acceptance period.

In order to achieve the above object, the utility model adopts the following technical solutions to realize:

A miniature analog circuit breaker, the miniature analog circuit breaker includes a plurality of opening and closing circuits with the same structure, and the opening and closing circuits include a closing relay K1, an opening relay K2, a first resistor R1 and The second resistor R2.

The coil of the closing relay K1 is connected in series with the closing point of the opening relay K2, and the first resistor R1 is connected in series with the closing point of the closing relay K1. The above two series circuits are connected in parallel. After the parallel connection, one end is connected to the negative pole of the power supply, and the other end is connected to the closing point. The input signal terminal, the other end after parallel connection is also connected to the positive pole of the power supply through the first open point of the closing relay K1;

The coil of the opening relay K2 is connected in parallel with the second resistor R2, and one end of the parallel connection is connected in series with the second opening point of the closing relay K1 to the negative pole of the power supply, and the other end is connected to the opening input signal end.

The miniature analog circuit breaker is connected to the comprehensive protection device through the input terminal, receives the control signal from the comprehensive protection device, and verifies whether the output signal of the comprehensive protection device is correct. The input terminal includes a plurality of closing input signals, multiple An opening input signal and a power signal.

The miniature analog circuit breaker also includes a closing indicator light 1HL and an opening indicator light 2HL. Both ends of the opening indicator light are connected between the closed point of the closing relay K1 of the closing circuit and the positive pole of the power supply. The two ends are respectively connected between the opening point of the closing relay K1 of the opening circuit and the positive pole of the power supply.

Compared with the prior art, the beneficial effects of the utility model are:

1. A miniature analog circuit breaker of the present utility model is used for the simulated equipment test of the comprehensive protection device. As the signal output terminal of the comprehensive protection device, a simple control circuit is used to replace the real circuit breaker action, and the verification of the comprehensive protection device is realized. The role of the device.

2. A miniature analog circuit breaker of the present invention adopts an opening relay and a closing relay to simulate the opening and closing actions of a real circuit breaker, which is consistent with the action of a real circuit breaker.

3. A miniature analog circuit breaker of the present utility model adopts resistors R1 and R2 to form a series circuit with the normally open point and normally closed point of the closing relay K1. The protection signal terminal forms a monitoring circuit for monitoring the closing and opening status.

4. A miniature analog circuit breaker of the present utility model adopts a multi-channel analog circuit breaker structure, which can simulate the control mode of opening and closing of three phases respectively.

Description of drawings

Fig. 1 is a schematic diagram of the circuit structure of a miniature analog circuit breaker of the present invention.

Detailed ways

The specific implementation modes provided by the present utility model will be described in detail below in conjunction with the accompanying drawings.

As shown in FIG. 1, a miniature analog circuit breaker includes three opening and closing circuits with the same structure, and the circuit structures of the opening and closing circuits 1, 2 and 3 are the same.

The opening and closing circuit 1 includes a closing relay K1, an opening relay K2, a first resistor R1 and a second resistor R2. The opening and closing circuit 2 includes a closing relay K3, an opening relay K4, a resistor R3 and a resistor R4. The opening and closing circuit 3 includes a closing relay K5, an opening relay K6, a resistor R5 and a resistor R6.

Taking the opening and closing circuit 1 as an example, the coil of the closing relay K1 is connected in series with the closing point of the opening relay K2, the first resistor R1 is connected in series with the closing point of the closing relay K1, and the above two series circuits are connected in parallel. One end is connected to the negative pole of the power supply, the other end is connected to the closing input signal terminal, and the other end after parallel connection is also connected to the positive pole of the power supply through the first switch point of the closing relay K1.

The coil of the opening relay K2 is connected in parallel with the second resistor R2, and one end of the parallel connection is connected in series with the second opening point of the closing relay K1 to the negative pole of the power supply, and the other end is connected to the opening input signal end.

The miniature analog circuit breaker also includes a closing indicator light 1HL and an opening indicator light 2HL. Both ends of the opening indicator light are connected between the closed point of the closing relay K1 of the closing circuit and the positive pole of the power supply. The two ends are respectively connected between the opening point of the closing relay K1 of the opening circuit and the positive pole of the power supply.

The miniature analog circuit breaker is connected to the comprehensive protection device through the input terminal, receives the control signal from the comprehensive protection device, and verifies whether the output signal of the comprehensive protection device is correct. The input terminal includes a plurality of closing input signals, multiple An opening input signal and a power signal.

The working principle of a kind of miniature analog circuit breaker of the present utility model is:

1. Closing monitoring: When ready to close, the comprehensive protection device monitors the closing state of the circuit breaker. At this time, in the closing circuit, the signal terminal of the comprehensive protection closes via the first resistor R1 and the normally closed point of the relay K1 A circuit is formed, when the closing relay K1 is not closed, the opening indicator light 2HL lights up, the comprehensive protection monitors the circuit path, and the closing monitoring indicator light in the comprehensive protection is on, indicating that it is in the opening state at this time, and the closing operation can be performed;

2. During the closing operation, the closing input terminal sends a closing signal, and a path is formed through the coil of the relay K1 and the normally closed point of K2, and the closing relay K1 is closed, and the closing circuit is in a self-holding state after the normally open point of K1 is closed. The closing indicator light 1HL is on; the normally closed point of K1 is disconnected, and the closing monitoring circuit is open, which means that the closing operation cannot be performed at this time.

3. Opening monitoring: After the closing relay K1 is closed, the normally open point of K1 is closed, so that the monitoring circuit of the opening circuit forms a path, the closing indicator 1HL lights up, and the opening input signal terminal passes through the second resistor R2 It forms a path with the normally open point of K1, and the opening monitoring indicator light in the integrated protection is on, indicating that the circuit breaker is in the closed state and can be opened;

4. During the opening operation, the opening signal is sent from the opening input terminal, and a path is formed between the relay K2 coil and the normally open point of the relay K1, the opening relay K2 is closed, and the K2 normally closed point is disconnected, so that The coil of the closing relay K1 loses power, the relay K1 is disconnected, the closing indicator light 1HL is off, and the opening indicator light 2HL is on.

A miniature analog circuit breaker of the present utility model is used for simulating equipment tests on comprehensive protection devices. As the signal output terminal of the comprehensive protection device, a simple control circuit is used to replace the real circuit breaker action, and the verification of comprehensive protection equipment is realized. effect.

Use the opening relay and closing relay to simulate the opening and closing actions of the real circuit breaker, which is consistent with the action of the real circuit breaker.

The first resistors R1 and R2 are used for impedance matching in the loop, and when the closing relay K1 is powered off, the high impedance of the opening and closing signal input terminals is ensured.

The multi-channel analog circuit breaker structure can be used to simulate the control mode of three-phase opening and closing respectively.

The use process of the simulated circuit breaker of the utility model is as follows:

1. In the normal construction of comprehensive protection transformation, the protection device test, the power outage transformation of related equipment (relay wiring, test, signal transmission), the dispatching centralized control system point check, the operator's acceptance and operation shall be carried out first.

2. Use miniature analog circuit breakers to carry out transformation steps such as device testing, signal transmission, and point-to-point dispatching and centralized control systems. These steps are partially tested before the relevant equipment is powered off, and the dispatching and centralized control system of the entire station can be completed point-to-point. .

The following problems can be avoided and dealt with:

1. Incorrect signals of the dispatching and centralized control system can be dealt with by the manufacturer before the transformation. A small amount of errors in the transformation process will be dealt with by the manufacturer after the transformation, so as to avoid errors during the power outage transformation and increase the power outage time of the transformation equipment and the number of times the manufacturer comes to the factory for service. Reduce renovation costs;

2. The device test can detect incorrect phenomena such as fixed values and control words, and solve them in advance to save time for transformation;

3. To avoid a large number of incorrect signal transmissions during the transformation, it is necessary to modify the background database in large quantities. If there are individual errors, the testers can modify them immediately without affecting the progress of the transformation;

4. When the equipment is powered off and transformed, only several construction steps such as relay wiring, protection acceptance, signal verification, operator acceptance, and operation are carried out.

Adopting the simulated circuit breaker of the utility model to carry out the test of the comprehensive protection device can save a large amount of personnel's commissioning cost and construction transformation cost.

The above embodiments are implemented on the premise of the technical solution of the present utility model, and detailed implementation methods and specific operation processes are given, but the protection scope of the present utility model is not limited to the above-mentioned embodiments. The methods used in the above examples are conventional methods unless otherwise specified.

Claims (3)

1. A miniature analog circuit breaker, characterized in that, the miniature analog circuit breaker comprises a plurality of structurally identical branching and closing circuits, and the described branching and closing circuits include a closing relay K1 and an opening relay K2 , the first resistor R1 and the second resistor R2; The coil of the closing relay K1 is connected in series with the closing point of the opening relay K2, and the first resistor R1 is connected in series with the closing point of the closing relay K1. The above two series circuits are connected in parallel. After the parallel connection, one end is connected to the negative pole of the power supply, and the other end is connected to the closing point. The input signal terminal, the other end after parallel connection is also connected to the positive pole of the power supply through the first open point of the closing relay K1; The coil of the opening relay K2 is connected in parallel with the second resistor R2, and one end of the parallel connection is connected in series with the second opening point of the closing relay K1 to the negative pole of the power supply, and the other end is connected to the opening input signal end. 2. A kind of miniature analog circuit breaker according to claim 1, characterized in that, said miniature analog circuit breaker is connected with the comprehensive protection device through the input terminal, receives the control signal from the comprehensive protection device, and verifies the comprehensive protection device Whether the output signal is correct, the input terminal includes multiple closing input signals, multiple opening input signals and power signals. 3. A miniature analog circuit breaker according to claim 1, characterized in that, the miniature analog circuit breaker also includes a closing indicator light 1HL and an opening indicator light 2HL, and the two ends of the opening indicator light are connected to the closing indicator light. Between the closing point of the closing relay K1 of the switching circuit and the positive pole of the power supply, the two ends of the closing indicator light are respectively connected between the opening point of the closing relay K1 of the opening circuit and the positive pole of the power supply.