Bus coupler isolation cabinet electrical locking system

Abstract

The invention relates to the field of bus coupler isolation cabinets, in particular to an electrical locking system of a bus coupler isolation cabinet. The intermediate relay KA is connected with currents of B and C phases of the bus coupler isolation cabinet to obtain currents on two sections of buses, so that the normally open state of the intermediate relay KA can be controlled when the currents exist on the B and C phases, the switch module cannot perform switching-on operation in the normally open state, and the switch module cannot perform switching-on operation only when at least one section of bus has no current. Only when the switch module is switched on, the safety of the bus coupler isolation cabinet in the bus switching process is ensured, and a switch button SB1, a switch button SB2, a change-over switch 1QK and a background control button are further arranged, so that the control modes of the switch module can be further enriched, and control methods of different distances can be realized; the bus coupler isolation cabinet solves the problem that when a bus is switched through a switch in the bus coupler isolation cabinet in the prior art, whether current exists on the buses at the two ends needs to be detected firstly, and potential safety hazards exist.

Description

Technical Field

[0001] The invention relates to the field of bus tie isolation cabinets, in particular to an electrical locking system for a bus tie isolation cabinet. Background Art

[0002] The busbar isolating cabinet is a commonly used isolating switchgear in the power system, usually installed in the substation of the high-voltage distribution system, such as Figure 1 and Figure 2 In the system, the busbar isolation cabinet is set at AA102 or AA101 between busbar 1# and busbar 2#, and is used to isolate the two sections of busbars and connect or switch the power supplies of the two sections of busbars. That is, through the busbar isolation cabinet, when a busbar fails, it can quickly switch to the other section of busbar for power supply, or when one section of busbar is under maintenance or overhaul, the other section of busbar can continue to supply power, thereby reducing system downtime to ensure the stable operation of the power system.

[0003] However, when the existing bus tie isolation cabinet switches the busbar through the switch inside the bus tie isolation cabinet, when there is power on the busbars on both sides of the switch, a short circuit occurs due to the different power sources on both sides, causing damage to the circuit in the bus tie isolation cabinet. Therefore, in the prior art, when switching the busbar, it is necessary to first detect the lines on both sides of the control switch in the bus tie isolation cabinet. Only when there is no power on at least one side of the line can the control switch be controlled to close. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an electrical locking system for a busbar isolation cabinet, which solves the problem that the current busbar isolation cabinet needs to detect whether there is current on the busbars at both ends before switching the busbars through switches inside the busbar isolation cabinet, posing a safety hazard.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An electrical locking system for a busbar isolation cabinet includes a frame circuit breaker 3QF, a control power supply for providing current to the frame circuit breaker 3QF, and a power supply module for providing working current to the frame circuit breaker, and also includes: a gate module arranged between the control frame circuit breaker 3QF and the positive electrode KM+ of the control power supply for controlling the on-off of the circuit;

[0007] The gate module includes a switch module connected to the positive electrode KM+ of the control power supply, and several switches and an intermediate relay KA in the incoming line cabinet connected in series with the switch module. The switch module is also connected to the C11 pin of the frame circuit breaker 3QF, the 13th and 14th pins of the intermediate relay KA are respectively connected to the B phase and the C phase of the frame circuit breaker 3QF, the 9th pin of the intermediate relay KA is connected to the C1 pin of the frame circuit breaker 3QF, and one of the 5th and 1st pins of the intermediate relay KA is connected to the line where the switch in the incoming line cabinet is located.

[0008] Preferably, the switch module includes a switch button SB1 connected in series between the positive pole of the control power supply KM+ and the incoming line cabinet, and a switch button SB2 connected between the positive pole of the control power supply KM+ and the C11 pin of the frame circuit breaker 3QF.

[0009] Preferably, the switch module also includes a conversion switch 1QK arranged on the positive pole KM+ of the control power supply, the switch button SB1 and the switch button SB2 are both connected to pin 2 of the conversion switch 1QK, and pins 1 and 3 of the conversion switch 1QK are connected to the positive pole KM+ of the control power supply.

[0010] Preferably, a background control button is connected to pin 3 of the conversion switch 1QK, and the background control button is also connected to the circuits at the switch button SB1 and the switch button SB2 respectively.

[0011] Preferably, the power module includes an apparatus power supply, which is connected to phases A, B and C of the frame circuit breaker 3QF, and resistors 1FU, 2FU and 3FU are respectively connected in series between the apparatus power supply and phases A, B and C of the frame circuit breaker 3QF.

[0012] Preferably, a multifunction meter PD is further arranged between the power module and the frame circuit breaker 3QF, the UN pin of the multifunction meter PD is connected to the device power supply, resistors 1FU, 2FU and 3FU are respectively arranged on the Ua, Ub and Uc pins of the multifunction meter PD, the Ia*, Ib* and Ic* pins of the multifunction meter PD are respectively connected to grounded current transformers 1TAa, 1TAb and 1TAc, and the Ia, Ib and Ic pins of the multifunction meter PD are all grounded.

[0013] Preferably, a signal lamp HR and a signal lamp HG are respectively connected between the 14th and 12th pins of the frame circuit breaker 3QF and the positive electrode KM+ of the control power supply.

[0014] Preferably, a signal light HY is connected between pin 35 of the frame circuit breaker 3QF and the positive electrode KM+ of the control power supply.

[0015] Preferably, pins 32 and 31 of the frame circuit breaker 3QF are both connected to a No. 1 incoming line cabinet, and pins 22 and 21 of the frame circuit breaker 3QF are both connected to a No. 2 incoming line cabinet.

[0016] Preferably, the K1 pin and U1 pin of the frame circuit breaker 3QF are connected to the positive pole KM+ of the control power supply, and the K2 pin, U2 pin, C2 pin, C12 pin, 11 pin and 38 pin of the frame circuit breaker 3QF are connected to the negative pole KM- of the control power supply.

[0017] Compared with the prior art, the present invention provides an electrical locking system for a busbar isolation cabinet, which has the following beneficial effects:

[0018] 1. The present invention obtains the current on the two bus sections by connecting the current of the B and C phases of the bus tie isolation cabinet through the intermediate relay KA, so that when there is current on both the B and C phases, the normally open state of the intermediate relay KA can be stably controlled. In the normally open state, the switch module cannot perform the closing operation. Only when there is no current on at least one of the bus sections can the switch module perform the closing operation, thereby ensuring the safety of the bus tie isolation cabinet during the bus switching process and avoiding the occurrence of short-circuit accidents.

[0019] 2. The present invention can further enrich the control mode of the switch module by further setting a switch button SB1, a switch button SB2, a transfer switch 1QK and a background control button, and realize different control methods for long and short distances, thereby further facilitating the control of the mother-coupled isolation cabinet.

[0020] 3. The present invention can monitor the closing and opening states of the switch module by setting the signal lights HR and HG, so that when the operator switches the bus, the closing and opening states of the switch module can be more clearly and conveniently identified, which is more convenient and does not require careful inspection of the corresponding switch.

[0021] 4. The present invention sets a multi-function electric meter to detect the three-phase current connected to the busbar isolation cabinet and the intermediate relay KA, and cooperates with resistors 1FU, 2FU and 3FU to ensure that the current is within an appropriate range to ensure the normal use of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 It is a first schematic diagram of the prior art;

[0024] Figure 2 It is a second schematic diagram of the prior art;

[0025] Figure 3 A circuit diagram of the electrical locking system of the busbar isolation cabinet of the present invention;

[0026] Figure 4 is a circuit diagram of a power module of the present invention;

[0027] Figure 5 is a circuit diagram of the gate module of the present invention;

[0028] Figure 6 FIG. 4 is a circuit diagram of the switch module of the present invention.

[0029] In the figure: 1. Power module; 2. Gate module; 3. Switch module. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0031] Those skilled in the art can understand that all or part of the steps in the following embodiments can be completed by instructing the relevant hardware through a program, so the present application can be in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application can be in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0032] In order to solve the problem that the existing busbar isolation cabinet needs to detect whether there is current on the busbars at both ends before switching the busbars through the switches in the busbar isolation cabinet, thus posing a potential safety hazard, the present invention provides an electrical locking system for the busbar isolation cabinet, such as Figure 3-Figure 6 As shown, it includes a frame circuit breaker 3QF, a control power supply for providing current to the frame circuit breaker 3QF, and a power supply module 1 for providing working current to the frame circuit breaker, and also includes: a gate module 2 arranged between the control frame circuit breaker 3QF and the positive electrode KM+ of the control power supply for controlling the on and off of the circuit. When there is current in the circuits on the busbars on both sides of the gate module 2, the gate module 2 cannot be closed to connect the busbars at both ends, thereby preventing the circuit in the bus tie isolation cabinet from being short-circuited;

[0033] The gate module 2 includes a switch module 3 connected to the positive electrode KM+ of the control power supply, and a plurality of switches and an intermediate relay KA in the incoming line cabinet connected in series with the switch module 3. The switch module 3 is also connected to the C11 pin of the frame circuit breaker 3QF, the 13th and 14th pins of the intermediate relay KA are respectively connected to the B phase and the C phase of the frame circuit breaker 3QF, the 9th pin of the intermediate relay KA is connected to the C1 pin of the frame circuit breaker 3QF, and one of the 5th and 1st pins of the intermediate relay KA is connected to the line where the switch in the incoming line cabinet is located. The following is an example of the connection between the 5th pin of the intermediate relay KA and the line where the switch in the incoming line cabinet is located. Figure 5 As shown, the current on phase B and phase C is taken from the busbars on both sides respectively, one of the busbars on the two sides is the load side busbar, and the other is the power side busbar. Therefore, when there is current on both phase B and phase C, pins 5 and 9 of the intermediate relay KA will be disconnected and remain in a normally open state. At this time, whether the switch module 3 is turned on or off, the busbars on both sides will not be connected. Only when the current on at least one side of phase B and phase C disappears, that is, when there is no current on at least one side of the busbars on both sides, pins 5 and 9 of the intermediate relay KA will be connected. At this time, the switching of the busbars on both sides can be realized by the switch of the switch module 3. At the same time, it also avoids the connection of the busbars on both sides when there is current at the same time, avoids short circuit during the switching process, improves the safety of the bus tie isolation cabinet, and ensures the stable operation of the power system.

[0034] exist Figure 5 In the embodiment, the switch module 3 cooperates with the intermediate relay KA to control the on / off of the line between the positive pole KM+ of the control power supply and the frame circuit breaker 3QF. The structure of a switch module 3 is provided below to realize this function. The switch module 3 includes a switch button SB1 connected in series between the positive pole KM+ of the control power supply and the incoming line cabinet, and a switch button SB2 connected between the positive pole KM+ of the control power supply and the C11 pin of the frame circuit breaker 3QF, so that a closing circuit is formed by the switch button SB1 connected to the C1 pin of the frame circuit breaker 3QF, and an opening circuit is formed by the switch button SB2 connected to the C11 pin of the frame circuit breaker 3QF.

[0035] The switch module 3 having only the switch button SB1 and the switch button SB2 requires manual control and adjustment of the switch, and its flexibility is relatively poor. The switch module 3 also includes a conversion switch 1QK arranged at the positive pole KM+ of the control power supply. The switch button SB1 and the switch button SB2 are both connected to the 2nd pin of the conversion switch 1QK, and the 1st pin and the 3rd pin of the conversion switch 1QK are connected to the positive pole KM+ of the control power supply. Through the "local" and "remote" operation modes of the conversion switch 1QK, the "local" mode usually refers to direct operation at the equipment site, and the "remote" mode refers to operation through remote control or computer system. These two modes have important applications in power systems, especially when controlling high-voltage switches, providing more flexible operation options to meet different operation requirements.

[0036] In order to further enrich the control mode of the switch module 3 and facilitate remote control of the switch module 3, a background control button is connected to the 3rd foot of the conversion switch 1QK, and the background control button is also connected to the lines at the switch button SB1 and the switch button SB2 respectively, so as to remotely realize Figure 6 The on-off control of lines 303, 133 and 313 is more convenient.

[0037] In order to ensure that the power supply current of the power module 1 meets the use requirements of the frame circuit breaker 3QF, the current size needs to be regulated. Therefore, the power module 1 includes a device power supply for providing working current for the equipment. The device power supply is connected to the A, B and C phases of the frame circuit breaker 3QF. Resistors 1FU, 2FU and 3FU are respectively connected in series between the device power supply and the A, B and C phases of the frame circuit breaker 3QF. The current of the connected A phase, B phase and C phase is adjusted by means of series resistance to ensure the stable operation of the frame circuit breaker 3QF and the intermediate relay KA.

[0038] In order to further ensure the stable operation of the frame circuit breaker 3QF and the intermediate relay KA, the three-phase current flowing into the frame circuit breaker 3QF and the intermediate relay KA is further detected. A multi-function meter PD is also arranged between the power module 1 and the frame circuit breaker 3QF. The UN pin of the multi-function meter PD is connected to the power supply of the device. Resistors 1FU, 2FU and 3FU are respectively arranged on the Ua, Ub and Uc pins of the multi-function meter PD. The Ia*, Ib* and Ic* pins of the multi-function meter PD are respectively connected to the grounded current transformers 1TAa, 1TAb and 1TAc. The Ia, Ib and Ic pins of the multi-function meter PD are all grounded. By grounding the secondary sides of the current transformers 1TAa, 1TAb and 1TAc, a current loop can be formed to guide the fault current to the ground, thereby protecting the safety of personnel and equipment. When a fault or overcurrent occurs in the system, the current transformers 1TAa, 1TAb and 1TAc will detect and generate corresponding signals to trigger the action of the protection device, disconnect or limit the current, and prevent further damage or danger.

[0039] When the switch buttons SB1 and SB2 are working, it may be sometimes wrong to judge whether they are closed only by their positions. Therefore, signal lights HR and HG are respectively connected between the 14th and 12th pins of the frame circuit breaker 3QF and the positive pole of the control power supply KM+. When the switch button SB1 is closed and the switch button SB2 is opened, the corresponding signal lights HR and HG will light up, making it easier for operators to understand more intuitively.

[0040] In order to more accurately determine whether the frame circuit breaker 3QF itself is energized, so as to ensure the effectiveness of the subsequent operation, a signal light HY is connected between the 35th foot of the frame circuit breaker 3QF and the positive pole KM+ of the control power supply, so that the power-on status of the frame circuit breaker 3QF can be intuitively observed to prevent the invalid operation due to the frame circuit breaker 3QF itself not being energized when closing or opening the switch.

[0041] In order to ensure the orderliness of the switch actions in the No. 1 incoming cabinet and the No. 2 incoming cabinet and avoid misoperation, the 32nd and 31st pins of the frame circuit breaker 3QF are connected to the No. 1 incoming cabinet, and the 22nd and 21st pins of the frame circuit breaker 3QF are connected to the No. 2 incoming cabinet. The electrical interlocking between the No. 1 incoming cabinet and the No. 2 incoming cabinet is realized through the frame circuit breaker 3QF.

[0042] In order to further ensure the accuracy of the wiring in the frame circuit breaker 3QF, the wiring of each pin of the frame circuit breaker 3QF is further explained. The K1 pin and U1 pin of the frame circuit breaker 3QF are both connected to the positive electrode KM+ of the control power supply, and the K2 pin, U2 pin, C2 pin, C12 pin, 11 pin and 38 pin of the frame circuit breaker 3QF are all connected to the negative electrode KM- of the control power supply, so as to clarify the correct wiring of the frame circuit breaker 3QF to ensure the stable operation of the overall circuit in this embodiment.

[0043] The above implementation methods have been described in detail. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An electrical locking system for a busbar isolation cabinet, comprising a frame circuit breaker 3QF, a control power supply for providing current to the frame circuit breaker 3QF, and a power supply module (1) for providing working current to the frame circuit breaker, characterized in that: Also includes: A gate module (2) arranged between the control frame circuit breaker 3QF and the control power positive electrode KM+ for controlling the on and off of the circuit; The gate module (2) comprises a switch module (3) connected to the positive electrode KM+ of the control power supply, and a plurality of switches and an intermediate relay KA in the incoming line cabinet connected in series with the switch module (3); the switch module (3) is also connected to the C11 pin of the frame circuit breaker 3QF; the 13th and 14th pins of the intermediate relay KA are respectively connected to the B phase and the C phase of the frame circuit breaker 3QF; the 9th pin of the intermediate relay KA is connected to the C1 pin of the frame circuit breaker 3QF; and one of the 5th and 1st pins of the intermediate relay KA is connected to the line where the switch in the incoming line cabinet is located.

2. The electrical locking system according to claim 1, characterized in that: The switch module (3) comprises a switch button SB1 connected in series between the positive electrode KM+ of the control power supply and the incoming line cabinet, and a switch button SB2 connected between the positive electrode KM+ of the control power supply and the C11 pin of the frame circuit breaker 3QF.

3. The electrical locking system according to claim 2, characterized in that: The switch module (3) further comprises a conversion switch 1QK arranged at the positive electrode KM+ of the control power supply, a switch button SB1 and a switch button SB2 are both connected to pin 2 of the conversion switch 1QK, and pins 1 and 3 of the conversion switch 1QK are connected to the positive electrode KM+ of the control power supply.

4. The electrical locking system according to claim 3, characterized in that: The 3rd pin of the conversion switch 1QK is connected with a background control button, and the background control button is also connected to the circuits at the switch button SB1 and the switch button SB2 respectively.

5. The electrical locking system according to claim 1, characterized in that: The power module (1) comprises a device power supply, which is connected to the A, B and C phases of the frame circuit breaker 3QF, and resistors 1FU, 2FU and 3FU are respectively connected in series between the device power supply and the A, B and C phases of the frame circuit breaker 3QF.

6. The electrical locking system according to claim 5, characterized in that: A multifunction meter PD is also provided between the power module (1) and the frame circuit breaker 3QF, the UN pin of the multifunction meter PD is connected to the device power supply, the resistors 1FU, 2FU and 3FU are respectively provided on the Ua, Ub and Uc pins of the multifunction meter PD, the Ia*, Ib* and Ic* pins of the multifunction meter PD are respectively connected to the grounded current transformers 1TAa, 1TAb and 1TAc, and the Ia, Ib and Ic pins of the multifunction meter PD are all grounded.

7. The electrical locking system according to claim 1, characterized in that: A signal lamp HR and a signal lamp HG are respectively connected between the 14th and 12th pins of the frame circuit breaker 3QF and the positive electrode KM+ of the control power supply.

8. The electrical locking system according to claim 1, characterized in that: A signal lamp HY is connected between the 35th foot of the frame circuit breaker 3QF and the positive electrode KM+ of the control power supply.

9. The electrical locking system according to claim 1, characterized in that: The 32nd and 31st pins of the frame circuit breaker 3QF are both connected to the No. 1 incoming line cabinet, and the 22nd and 21st pins of the frame circuit breaker 3QF are both connected to the No. 2 incoming line cabinet.

10. The electrical locking system according to claim 1, characterized in that: The K1 pin and U1 pin of the frame circuit breaker 3QF are both connected to the positive electrode KM+ of the control power supply, and the K2 pin, U2 pin, C2 pin, C12 pin, 11 pin and 38 pin of the frame circuit breaker 3QF are all connected to the negative electrode KM- of the control power supply.

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