An improved dual power supply switching circuit

Abstract

The utility model relates to an improved dual power supply switching circuit, including a bus tie circuit and an incoming line circuit; the bus tie circuit includes: a bus tie remote closing circuit, a bus tie local closing circuit, a bus tie remote opening circuit, a bus tie local opening circuit and a bus tie interlock opening circuit; the incoming line circuit includes: an incoming line remote closing circuit, an incoming line local closing circuit, an incoming line remote opening circuit, an incoming line local opening circuit and a high-voltage side interlock opening circuit. The utility model can solve the problem of power failure of load equipment when switching power supply during 400V segment maintenance.

Description

Technical Field

[0001] The utility model belongs to the technical field of relay protection and safety automatic devices, and relates to a dual power supply switching circuit, in particular to an improved dual power supply switching circuit. Background Art

[0002] For power plants, the 400V section (i.e., the low-voltage working section) is generally divided into two sections, and the bus tie switch is used as a backup power supply between the two sections. In order to avoid long-term closed-loop operation of the low-voltage working section due to misoperation, the 400VA, B section incoming power supply and the bus tie switch control circuit were originally designed with a "three-out-of-two" locking logic for the incoming power supply, that is, if any two switches in the PC A, B section incoming power supply and the bus tie switch are closed, the remaining switch cannot be closed.

[0003] However, this means that when the 400V A section (B section) incoming power supply needs to be repaired and the 400V B section (A section) needs to supply power to the 400V A section (B section) through the bus tie switch, the 400V A section (B section) incoming power supply must be disconnected first, and then the bus tie switch is closed. The upper feeder power supplies of the 400V A and B sections belong to the same source system and are allowed to be paralleled for a short time. This method requires the operator to switch all the load equipment in section A (B) to other power supplies. The load switching time is long and there are many operation steps. At the same time, there are also devices that are not allowed to be powered off, which affects the maintenance task of the upper feeder power supply.

[0004] Therefore, the utility model provides an improved dual power switching circuit to solve the above problems.

[0005] After searching, no public documents of the prior art that are identical or similar to the present utility model were found. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and to propose an improved dual power supply switching circuit which is reasonably designed, simple to operate and convenient to improve, and can solve the problem of power failure of load equipment when switching power supplies during 400V segment maintenance.

[0007] The utility model solves the practical problem by adopting the following technical solutions:

[0008] An improved dual power supply switching circuit includes a bus tie circuit and an incoming line circuit; the bus tie circuit includes: a bus tie remote closing circuit, a bus tie local closing circuit, a bus tie remote opening circuit, a bus tie local opening circuit and a bus tie interlocking opening circuit;

[0009] The busbar remote closing circuit comprises: a first PLC closing module, a first switch position locking module, a first opening and closing coil module and a locking release pressure plate LP2; the positive terminal is connected to one end of the first PLC closing module, the other end of the first PLC closing module is connected to one end of the locking release pressure plate LP2, and the other end of the locking release pressure plate LP2 is connected to the first opening and closing coil module; the first switch position locking module is connected in parallel with the locking release pressure plate LP2, one end of the first switch position locking module is connected to the first PLC closing module, and the other end is connected to the first opening and closing coil module;

[0010] The bus tie local closing circuit comprises: a local closing button SB1, the positive electricity is connected to one end of the local closing button SB1, the other end of the local closing button SB1 is connected to one end of the first switch position locking module, the other end of the first switch position locking module is connected to one end of the first opening and closing coil module, and the other end of the first opening and closing coil module is connected to the negative electricity; the other end of the local closing button SB1 is also connected to one end of the locking release pressure plate LP2, the other end of the locking release pressure plate LP2 is connected to the first opening and closing coil module, and the other end of the first opening and closing coil module is connected to the negative electricity;

[0011] The main bus interlocking trip circuit includes: an incoming switch closing interlocking trip module and an incoming line interlocking pressure plate LP1; the positive electricity is connected to one end of the incoming switch closing interlocking trip module, the other end of the incoming switch closing interlocking trip module is connected to one end of the incoming line interlocking pressure plate LP1, the other end of the incoming line interlocking pressure plate LP1 is connected to the first closing and opening coil module, and the other end of the first closing and opening coil module is connected to the negative electricity.

[0012] Moreover, the busbar remote trip circuit comprises: a first PLC trip module, the positive electricity is connected to one end of the first PLC trip module, the other end of the first PLC trip module is connected to one end of the first opening and closing coil module, and the other end of the first opening and closing coil module is connected to the negative electricity;

[0013] The bus tie local disconnection circuit includes: a local disconnection button SB2, the positive power is connected to one end of the local disconnection button SB2, the other end of the local disconnection button SB2 is connected to the first disconnection and closing coil module, and the other end of the first disconnection and closing coil module is connected to the negative power.

[0014] Moreover, the incoming line circuit includes: an incoming line remote closing circuit, an incoming line local closing circuit, an incoming line remote opening circuit, an incoming line local opening circuit and a high-voltage side interlocking opening circuit.

[0015] Moreover, the incoming line remote closing circuit includes: a second PLC closing module, a second switch position locking module, a second opening and closing coil module and a conductor L1; the positive electricity is connected to one end of the second PLC closing module, the other end of the second PLC closing module is connected to one end of the second switch position locking module, the other end of the second switch position locking module is connected to one end of the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative electricity; the two ends of the second switch position locking module are connected in parallel with the conductor L1, one end of the conductor L1 is connected to the second PLC closing module, and the other end is connected to the second opening and closing coil module.

[0016] Moreover, the incoming line local closing circuit includes: a local closing button SB3; the positive electricity is connected to one end of the local closing button SB3, the other end of the local closing button SB3 is connected to the second switch position locking module, the other end of the second switch position locking module is connected to the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative electricity; the other end of the local closing button SB3 is also directly connected to one end of the second opening and closing coil module through the wire L1, and the other end of the second opening and closing coil module is connected to the negative electricity.

[0017] Moreover, the incoming remote opening circuit includes: a second PLC opening module; the positive power is connected to one end of the second PLC opening module, the other end of the second PLC opening module is connected to the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative power;

[0018] The incoming local opening circuit includes: a local opening button SB4; the positive power is connected to one end of the local opening button SB4, the other end of the local opening button SB4 is connected to the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative power;

[0019] The high-voltage side interlocking opening circuit includes: the high-voltage side switch closing interlocking opening module and the high-voltage side switch interlocking voltage plate LP3 are positively connected to one end of the high-voltage side switch closing interlocking opening module, the other end of the high-voltage side switch closing interlocking opening module is connected to the high-voltage side switch interlocking voltage plate LP3, the other end of the high-voltage side switch interlocking voltage plate LP3 is connected to one end of the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative power.

[0020] Advantages and beneficial effects of the utility model:

[0021] 1. The utility model improves the interlocking breaking circuit and the interlocking breaking circuit of the 400V section switch, so that the three switches of the two incoming line switches and the bus tie switch can be closed at the same time, so that the load equipment will not lose power and the normal operation of the equipment is guaranteed.

[0022] 2. The utility model realizes the parallel and reverse switching of the 400V incoming power supply. When a certain power supply needs to be repaired, there is no need to shut down the load equipment for power switching, thus ensuring the normal maintenance of the upper level power supply.

[0023] 3. The utility model switches different working modes through the pressure plate. When LP1 is closed and LP2 is disconnected, it is the normal operation mode. When LP1 is disconnected and LP2 is closed, it is the power switching mode. This reduces the operating procedures of the operating personnel and reduces the operating difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an improved diagram of the busbar circuit of the utility model;

[0025] Figure 2 This is an improved diagram of the incoming line circuit of the utility model;

[0026] Description of reference numerals:

[0027] 1-bus tie remote closing circuit; 2-bus tie local closing circuit; 3-bus tie remote opening circuit; 4-bus tie local opening circuit; 5-interlock opening circuit; 6-incoming line remote closing circuit; 7-incoming line local closing circuit; 8-incoming line remote opening circuit; 9-incoming line local opening circuit; 10-high voltage side interlock opening circuit; 11-400V section switch interlock opening circuit; DETAILED DESCRIPTION

[0028] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0029] An improved dual power switching circuit, such as Figure 1 and Figure 2 As shown, it includes a bus tie circuit and an incoming line circuit; the bus tie circuit includes: a bus tie remote closing circuit, a bus tie local closing circuit, a bus tie remote opening circuit, a bus tie local opening circuit and a bus tie interlocking opening circuit;

[0030] The busbar remote closing circuit comprises: a first PLC closing module, a first switch position locking module, a first opening and closing coil module and a locking release pressure plate LP2; the positive terminal is connected to one end of the first PLC closing module, the other end of the first PLC closing module is connected to one end of the locking release pressure plate LP2, and the other end of the locking release pressure plate LP2 is connected to the first opening and closing coil module; the first switch position locking module is connected in parallel with the locking release pressure plate LP2, one end of the first switch position locking module is connected to the first PLC closing module, and the other end is connected to the first opening and closing coil module;

[0031] The bus tie local closing circuit comprises: a local closing button SB1, the positive electricity is connected to one end of the local closing button SB1, the other end of the local closing button SB1 is connected to one end of the first switch position locking module, the other end of the first switch position locking module is connected to one end of the first opening and closing coil module, and the other end of the first opening and closing coil module is connected to the negative electricity; the other end of the local closing button SB1 is also connected to one end of the locking release pressure plate LP2, the other end of the locking release pressure plate LP2 is connected to the first opening and closing coil module, and the other end of the first opening and closing coil module is connected to the negative electricity;

[0032] The busbar remote trip circuit comprises: a first PLC trip module, the positive power is connected to one end of the first PLC trip module, the other end of the first PLC trip module is connected to one end of the first opening and closing coil module, and the other end of the first opening and closing coil module is connected to the negative power;

[0033] The bus tie local opening circuit comprises: a local opening button SB2, the positive power is connected to one end of the local opening button SB2, the other end of the local opening button SB2 is connected to the first opening and closing coil module, and the other end of the first opening and closing coil module is connected to the negative power;

[0034] The busbar interlocking opening circuit comprises: an incoming switch closing interlocking opening module and an incoming line interlocking pressure plate LP1; the positive electricity is connected to one end of the incoming switch closing interlocking opening module, the other end of the incoming switch closing interlocking opening module is connected to one end of the incoming line interlocking pressure plate LP1, the other end of the incoming line interlocking pressure plate LP1 is connected to the first opening and closing coil module, and the other end of the first opening and closing coil module is connected to the negative electricity;

[0035] The incoming line circuit includes: an incoming line remote closing circuit, an incoming line local closing circuit, an incoming line remote opening circuit, an incoming line local opening circuit and a high-voltage side interlocking opening circuit;

[0036] The incoming remote closing circuit comprises: a second PLC closing module, a second switch position locking module, a second opening and closing coil module and a conductor L1; the positive electricity is connected to one end of the second PLC closing module, the other end of the second PLC closing module is connected to one end of the second switch position locking module, the other end of the second switch position locking module is connected to one end of the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative electricity; the two ends of the second switch position locking module are connected in parallel with the conductor L1, one end of the conductor L1 is connected to the second PLC closing module, and the other end is connected to the second opening and closing coil module;

[0037] The incoming local closing circuit includes: a local closing button SB3; the positive electricity is connected to one end of the local closing button SB3, the other end of the local closing button SB3 is connected to the second switch position locking module, the other end of the second switch position locking module is connected to the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative electricity; the other end of the local closing button SB3 is also directly connected to one end of the second opening and closing coil module through the wire L1, and the other end of the second opening and closing coil module is connected to the negative electricity;

[0038] The incoming remote opening circuit comprises: a second PLC opening module; the positive power is connected to one end of the second PLC opening module, the other end of the second PLC opening module is connected to the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative power;

[0039] The incoming local opening circuit includes: a local opening button SB4; the positive power is connected to one end of the local opening button SB4, the other end of the local opening button SB4 is connected to the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative power;

[0040] The high-voltage side interlocking opening circuit comprises: a high-voltage side switch closing interlocking opening module and a high-voltage side switch interlocking voltage plate LP3 are positively connected to one end of the high-voltage side switch closing interlocking opening module, the other end of the high-voltage side switch closing interlocking opening module is connected to the high-voltage side switch interlocking voltage plate LP3, the other end of the high-voltage side switch interlocking voltage plate LP3 is connected to one end of the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative power;

[0041] The improvement process of the utility model is:

[0042] Figure 1 This is the improved diagram of the busbar circuit of the utility model. Figure 1 As shown, including:

[0043] 1- Bus tie remote closing circuit:

[0044] Before improvement: the positive power is connected to the first PLC closing module, the first PLC closing module is connected to the first switch position locking module, the first switch position locking module is connected to the first opening and closing coil module, and the first opening and closing coil module is connected to the negative power.

[0045] After improvement: the positive power is connected to the first PLC closing module, the first PLC closing module is connected to the lock release pressure plate LP2, the lock release pressure plate LP2 is connected to the first opening and closing coil module, and the first opening and closing coil module is connected to the negative power.

[0046] 2- Bus tie local closing circuit:

[0047] Before improvement: the positive power is connected to the local closing button, the local closing button is connected to the first switch position locking module, the first switch position locking module is connected to the first opening and closing coil module, and the first opening and closing coil module is connected to the negative power.

[0048] After improvement: The improved circuit directly connects the positive power to the local closing button, the local closing button is connected to the lock release pressure plate LP2, the lock release pressure plate LP2 is connected to the first opening and closing coil module, and the first opening and closing coil module is connected to the negative power.

[0049] 3-bus remote opening circuit, the positive power is connected to the first PLC opening module, the first PLC opening module is connected to the first opening and closing coil module, and the first opening and closing coil module is connected to the negative power

[0050] 4-bus tie local opening circuit, the positive power is connected to the local opening button, the local opening button is connected to the first opening and closing coil module, the first opening and closing coil module is connected to the negative power

[0051] 5-Main coupling interlocking opening circuit,

[0052] Before improvement: the positive power is connected to the incoming switch closing interlock opening module, the incoming switch closing interlock opening module is connected to the first opening and closing coil module, and the first opening and closing coil module is connected to the negative power.

[0053] After improvement: the positive power is connected to the incoming switch closing interlock opening module, the incoming switch closing interlock opening module is connected to the incoming line interlocking pressure plate LP1, the incoming line interlocking pressure plate LP1 is connected to the first opening and closing coil module, and the first opening and closing coil module is connected to the negative power.

[0054] Figure 2 This is the improved diagram of the new incoming line circuit of the utility model, such as Figure 2 As shown, including:

[0055] 6-Incoming remote closing circuit:

[0056] Before improvement: the positive power is connected to the second PLC closing module, the second PLC closing module is connected to the second switch position locking module, the second switch position locking module is connected to the second opening and closing coil module, and the second opening and closing coil module is connected to the negative power.

[0057] After improvement: the positive power is connected to the second PLC closing module, the second PLC closing module is directly connected to the second opening and closing coil module through the wire L1, and the second opening and closing coil module is connected to the negative power;

[0058] 7- Incoming line local closing circuit:

[0059] Before improvement: the positive power is connected to the local closing button, the local closing button is connected to the second switch position locking module, the second switch position locking module is connected to the second opening and closing coil module, and the second opening and closing coil module is connected to the negative power.

[0060] After improvement: Local closing circuit, the positive power is connected to the local closing button, the local closing button is connected to the second opening and closing coil module, and the second opening and closing coil module is connected to the negative power.

[0061] 8-Incoming remote opening circuit: positive power is connected to the second PLC opening module, the second PLC opening module is connected to the second opening and closing coil module, and the second opening and closing coil module is connected to the negative power

[0062] 9- Incoming local opening circuit: the positive power is connected to the local opening button, the local opening button is connected to the second opening and closing coil module, and the second opening and closing coil module is connected to the negative power.

[0063] 10- High-voltage side interlocking opening circuit: The positive power is connected to the high-voltage side switch closing interlocking opening module, the high-voltage side switch closing interlocking opening module is connected to the high-voltage side switch interlocking tripping plate LP3, the high-voltage side switch interlocking tripping plate LP3 is connected to the second opening and closing coil module, and the second opening and closing coil module is connected to the negative power.

[0064] 11-400V section switch interlocking opening circuit:

[0065] Before improvement: positive power is connected to the 400V switch closing interlock opening module, the 400V switch closing interlock opening module is connected to the second opening and closing coil module, and the second opening and closing coil module is connected to the negative power.

[0066] After improvement: the interlocking and disconnecting module of the incoming 400V switch will be cancelled

[0067] The working process of the utility model is:

[0068] When switching the power supply, exit LP1 and close LP2, use the local closing button SB1 to close the bus tie switch, and after confirming that the bus tie switch has been closed, use the local disconnecting button SB4 to disconnect the power supply that needs maintenance.

[0069] The working principle of the utility model is:

[0070] 1. The utility model cancels the closing lock in the incoming switch by adding a short-circuit wire. The incoming switch can continue to be closed when the busbar switch and another incoming switch are in the closed state.

[0071] 2. The utility model disconnects the tripping circuit of another incoming line switch position and the bus tie switch position in the incoming line switch tripping circuit, cancels the "three out of two" logic in the incoming line switch control circuit, and enables the three switches to be closed at the same time.

[0072] 3. The utility model adds two pressure plates in the bus tie switch circuit, LP1 is added in the trip circuit, and LP2 is added in the closing circuit. During normal operation, LP1 is switched on and LP2 is switched off, and the bus tie switch still maintains the "three out of two" blocking logic. However, when switching the power supply, LP1 is switched off and LP2 is switched on, and the "three out of two" blocking logic and the closing blocking logic are cancelled. This improvement prevents the closing loop from occurring during normal operation, and the switching can be done in parallel when switching the power supply.

[0073] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention includes but is not limited to the embodiments described in the specific implementation manner. Any other implementation manners derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. An improved dual power switching circuit, characterized in that: It includes a bus tie circuit and an incoming line circuit; the bus tie circuit includes: a bus tie remote closing circuit, a bus tie local closing circuit, a bus tie remote opening circuit, a bus tie local opening circuit and a bus tie interlocking opening circuit; The busbar remote closing circuit comprises: a first PLC closing module, a first switch position locking module, a first opening and closing coil module and a locking release pressure plate LP2; the positive terminal is connected to one end of the first PLC closing module, the other end of the first PLC closing module is connected to one end of the locking release pressure plate LP2, and the other end of the locking release pressure plate LP2 is connected to the first opening and closing coil module; the first switch position locking module is connected in parallel with the locking release pressure plate LP2, one end of the first switch position locking module is connected to the first PLC closing module, and the other end is connected to the first opening and closing coil module; The bus tie local closing circuit comprises: a local closing button SB1, the positive electricity is connected to one end of the local closing button SB1, the other end of the local closing button SB1 is connected to one end of the first switch position locking module, the other end of the first switch position locking module is connected to one end of the first opening and closing coil module, and the other end of the first opening and closing coil module is connected to the negative electricity; the other end of the local closing button SB1 is also connected to one end of the locking release pressure plate LP2, the other end of the locking release pressure plate LP2 is connected to the first opening and closing coil module, and the other end of the first opening and closing coil module is connected to the negative electricity; The main bus interlocking trip circuit includes: an incoming switch closing interlocking trip module and an incoming line interlocking pressure plate LP1; the positive electricity is connected to one end of the incoming switch closing interlocking trip module, the other end of the incoming switch closing interlocking trip module is connected to one end of the incoming line interlocking pressure plate LP1, the other end of the incoming line interlocking pressure plate LP1 is connected to the first closing and opening coil module, and the other end of the first closing and opening coil module is connected to the negative electricity.

2. The improved dual power switching circuit according to claim 1, characterized in that: The busbar remote trip circuit comprises: a first PLC trip module, the positive power is connected to one end of the first PLC trip module, the other end of the first PLC trip module is connected to one end of the first opening and closing coil module, and the other end of the first opening and closing coil module is connected to the negative power; The bus tie local disconnection circuit includes: a local disconnection button SB2, the positive power is connected to one end of the local disconnection button SB2, the other end of the local disconnection button SB2 is connected to the first disconnection and closing coil module, and the other end of the first disconnection and closing coil module is connected to the negative power.

3. The improved dual power switching circuit according to claim 1, characterized in that: The incoming line circuit includes: an incoming line remote closing circuit, an incoming line local closing circuit, an incoming line remote opening circuit, an incoming line local opening circuit and a high-voltage side interlocking opening circuit.

4. The improved dual power switching circuit according to claim 3, characterized in that: The incoming remote closing circuit includes: a second PLC closing module, a second switch position locking module, a second opening and closing coil module and a conductor L1; the positive electricity is connected to one end of the second PLC closing module, the other end of the second PLC closing module is connected to one end of the second switch position locking module, the other end of the second switch position locking module is connected to one end of the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative electricity; the two ends of the second switch position locking module are connected in parallel with the conductor L1, one end of the conductor L1 is connected to the second PLC closing module, and the other end is connected to the second opening and closing coil module.

5. The improved dual power switching circuit according to claim 3, characterized in that: The incoming line local closing circuit includes: a local closing button SB3; the positive electricity is connected to one end of the local closing button SB3, the other end of the local closing button SB3 is connected to the second switch position locking module, the other end of the second switch position locking module is connected to the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative electricity; the other end of the local closing button SB3 is also directly connected to one end of the second opening and closing coil module through the wire L1, and the other end of the second opening and closing coil module is connected to the negative electricity.

6. The improved dual power switching circuit according to claim 3, characterized in that: The incoming remote opening circuit comprises: a second PLC opening module; the positive power is connected to one end of the second PLC opening module, the other end of the second PLC opening module is connected to the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative power; The incoming local opening circuit includes: a local opening button SB4; the positive power is connected to one end of the local opening button SB4, the other end of the local opening button SB4 is connected to the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative power; The high-voltage side interlocking opening circuit includes: the high-voltage side switch closing interlocking opening module and the high-voltage side switch interlocking voltage plate LP3 are positively connected to one end of the high-voltage side switch closing interlocking opening module, the other end of the high-voltage side switch closing interlocking opening module is connected to the high-voltage side switch interlocking voltage plate LP3, the other end of the high-voltage side switch interlocking voltage plate LP3 is connected to one end of the second opening and closing coil module, and the other end of the second opening and closing coil module is connected to the negative power.

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