A design method for intelligent operation board

Abstract

The present invention discloses a design method for an intelligent operation board. A MOSFET circuit is added to the internal circuit of a line protection box. When a circuit breaker fails, the MOSFET circuit can automatically cut off the control power supply of the operation circuit through a CPU control command, without generating arcing, thereby protecting the closing and opening coils of the circuit breaker from being burned. On the intelligent board, control output can be performed according to external information, and the circuit can be controlled according to feedback signals and an internally set opening and closing holding time. The design method of the intelligent operation board of the present invention can record various on-site operations, perform accident analysis, and protect the opening and closing coils of the circuit breaker and the opening and closing relay nodes on the measurement and control equipment, thereby solving the problem of only protecting the relay nodes and sacrificing the opening and closing coils of the circuit breaker.

Description

Technical Field

[0001] The present invention relates to the field of electrical technology, in particular to a design method for an intelligent operation board. Background Art

[0002] In the power system, the logical functions of the power circuit breaker (switch) operating circuit mainly include: closing hold, opening hold, anti-trip circuit, manual closing, manual opening, remote control closing, remote control opening, etc.

[0003] The operation board of a general operation box is mainly composed of relays. The various logical functions of the operation circuit are realized through the cooperation between the relays and between the relays and the auxiliary contacts and hard pressure plates of the circuit breaker. The power supply of the operation circuit is provided by the external control power supply.

[0004] Traditionally, the operating board is not equipped with a CPU, and the operating circuit is built purely on hardware. It does not have intelligent board and self-check functions, and cannot report real-time information of the board and the operating circuit.

[0005] In order to prevent the relay nodes from burning out due to faults in the operating circuit, traditional operation boards are equipped with a closing and opening holding circuit. When a fault occurs in the circuit breaker body, the closing or opening holding circuit of the board is connected. At this time, the board cannot actively cut off the power supply of the closing or opening circuit. In this case, the closing or opening coil of the circuit breaker is easily burned out due to prolonged power supply. Figure 4 As shown in the figure, relay nodes such as HJ, BCJ, and TJ can easily burn out if not properly addressed in the event of a fault in the operating circuit or a circuit breaker fault. Therefore, in the event of a fault, the operating box closes the nodes (HBJ and TBJ) of the closing / opening holding relay in the closing / opening holding circuit, keeping the closing / opening holding circuit energized and the circuit breaker closing / opening coils (HQ and TQ) energized. This prevents burnout of the operating box's relays, but does result in burnout of the circuit breaker closing / opening coils. Summary of the Invention

[0006] The purpose of the present invention is to provide a design method for an intelligent operation board to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A design method for an intelligent operation board adds a MOSFET circuit to the internal circuit of a line protection box. When a circuit breaker fails, the MOSFET circuit can automatically cut off the control power supply of the operation circuit through CPU control commands, preventing arcing and thus protecting the closing and opening coils of the circuit breaker from burning out. On the intelligent board, control outputs can be performed based on external information, and the circuit can be controlled based on feedback signals and internally set closing and opening holding times.

[0009] As a further technical solution of the present invention: the external information includes signals such as manual closing and opening of the switch, remote closing and opening of the switch, and external locking.

[0010] As a further technical solution of the present invention: the feedback signal is the closing or opening state of the circuit breaker.

[0011] As a further technical solution of the present invention: the line protection box is composed of relay TBJ, relay HJ, relay HBJ, relay TW, relay HW, relay HBSJ, relay TBSJ and their contacts.

[0012] As a further technical solution of the present invention: the Mosfet circuit includes two upper and lower circuits, one end of the upper circuit is connected to the contact of the relay TBJ, and the other end is connected to the normally closed switch on the primary device; one end of the lower circuit is connected to the coil of the relay TBJ, and the other end is connected to the normally open switch on the primary device.

[0013] As a further technical solution of the present invention: the closing steps are as follows: receiving a closing command from the CPU, judging whether the closing conditions are met, if not, ending the operation, if so, closing the closing relay, closing the MOSFET circuit, and judging whether the switch action time has arrived, if not, returning, if so, cutting off the MOSFET circuit, disconnecting the closing relay, and ending the action.

[0014] As a further technical solution of the present invention: the opening step is as follows: upon receiving the opening command from the CPU, determining whether the closing condition is met, if not, ending the operation, if so, closing the closing relay, closing the MOSFET circuit, and determining whether the switch action time has arrived, if not, returning, if so, cutting off the MOSFET circuit, disconnecting the closing relay, and ending the action.

[0015] Compared with the existing technology, the beneficial effects of the present invention are: the design method of the intelligent operation board card of the present invention can record various on-site operations, perform accident analysis, and protect the circuit breaker's opening and closing coils and the opening and closing relay nodes on the measurement and control equipment, solving the previous problem of only protecting the relay nodes and sacrificing the circuit breaker's opening and closing coils. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1Added Mosfet circuit diagram for the operation board;

[0017] Figure 2 To control the closing logic diagram of the operation board;

[0018] Figure 3 It is the logic diagram of the opening control of the operation board;

[0019] Figure 4 The electrical schematic diagram of the prior art. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figure 1-3 A design method for an intelligent operation board adds a MOSFET circuit to the internal circuit of the line protection box. When a circuit breaker fails, the MOSFET circuit can automatically cut off the control power of the operation circuit through the CPU control command, without generating arcing, thereby protecting the closing and opening coils of the circuit breaker from burning. On the intelligent board, the output can be controlled according to external information, and the circuit can be controlled according to the feedback signal and the internally set closing and opening holding time.

[0022] As a further technical solution of the present invention: the external information includes signals such as manual closing and opening of the switch, remote closing and opening of the switch, and external locking.

[0023] As a further technical solution of the present invention: the feedback signal is the closing or opening state of the circuit breaker.

[0024] As a further technical solution of the present invention: the line protection box is composed of relay TBJ, relay HJ, relay HBJ, relay TW, relay HW, relay HBSJ, relay TBSJ and their contacts.

[0025] As a further technical solution of the present invention: the Mosfet circuit includes two upper and lower circuits, one end of the upper circuit is connected to the contact of the relay TBJ, and the other end is connected to the normally closed switch on the primary device; one end of the lower circuit is connected to the coil of the relay TBJ, and the other end is connected to the normally open switch on the primary device.

[0026] Example 2: Based on Example 1, Figure 2-3As shown, the closing steps are as follows: after receiving the CPU closing command, determine whether the closing conditions are met. If not, end the operation. If so, close the closing relay, close the MOSFET circuit, and determine whether the switch action time has arrived. If not, return. If so, cut off the MOSFET circuit, disconnect the closing relay, and end the action.

[0027] The opening steps are as follows: after receiving the CPU opening command, determine whether the closing conditions are met. If not, end the operation. If so, close the closing relay, close the MOSFET circuit, and determine whether the switch action time has arrived. If not, return. If so, cut off the MOSFET circuit, disconnect the closing relay, and end the action.

[0028] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0029] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A design method for an intelligent operation board, characterized in that: A MOSFET circuit is added to the internal circuit of the line protection box. When a circuit breaker fails, the MOSFET circuit automatically cuts off the control power supply of the operating circuit through the CPU control command to prevent arcing, thereby protecting the closing and opening coils of the circuit breaker from being burned. On the smart card, the control output can be controlled according to external information, and the circuit can be controlled according to the feedback signal and the internally set closing and opening holding time; The external information includes any one of the signals of manual closing and opening, remote closing and opening, and external locking; The feedback signal is the closing and opening status of the circuit breaker; The Mosfet circuit includes two upper and lower circuits, one end of the upper circuit is connected to the contact of relay TB, and the other end is connected to the normally closed switch on the primary device; the lower circuit end is connected to the coil of relay TBJ, and the other end is connected to the normally open switch on the primary device.

2. The design method of an intelligent operation board according to claim 1, characterized in that: The line protection box is composed of a relay TBJ, a relay HJ, a relay HBJ, a relay TW, a relay HW, a relay HBSJ, a relay TBSJ and contacts thereof.

3. The design method of an intelligent operation board according to claim 2, characterized in that: The closing steps are as follows: after receiving the CPU closing command, determine whether the closing conditions are met. If not, end the operation. If so, close the closing relay, close the MOSFET circuit, and determine whether the switch action time has arrived. If not, return. If so, cut off the MOSFET circuit, disconnect the closing relay, and end the action.

4. The design method of an intelligent operation board according to claim 3, characterized in that: The opening steps are as follows: after receiving the CPU opening command, determine whether the closing conditions are met. If not, end the operation. If so, close the closing relay, close the MOSFET circuit, and determine whether the switch action time has arrived. If not, return. If so, cut off the MOSFET circuit, disconnect the closing relay, and end the action.

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