Electrical control cabinet with fault self-diagnosis function

Abstract

The utility model relates to the technical field of power supply and distribution, and discloses an electrical control cabinet with a fault self-diagnosis function, which comprises a high-voltage bus connection chamber, a switch chamber and a cable lead-out chamber, a circuit breaker is arranged in the switch chamber and comprises a moving contact used for disconnection or connection, the moving contact is connected with a tripping assembly which enables the moving contact to act instantaneously, and the tripping assembly is connected with the cable lead-out chamber. The tripping assembly is provided with a proximity switch for detecting the movement of the tripping assembly, the power utilization end is provided with a mutual inductor, the mutual inductor and the proximity switch are connected to the input end of the local controller, the mutual inductor is used for collecting electric signals on a power utilization cable, and the proximity switch is used for collecting signals whether the tripping assembly acts or not; the local controller automatically diagnoses whether the moving contact is normally disconnected according to signals of the mutual inductor and the proximity switch, and the circuit breaker can normally disconnect a high-voltage power supply through fault self-diagnosis of the circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of power supply and distribution technology, specifically to an electrical control cabinet with a fault self-diagnosis function. Background Technology

[0002] Control cabinets with self-diagnostic capabilities are called intelligent control cabinets. These cabinets inherently possess a certain degree of self-diagnostic and automatic control performance. While current intelligent control cabinets offer some self-diagnostic and automatic control capabilities, high-voltage electrical distribution cabinets often suffer from issues. During the disconnection process, the switching devices used can generate electric arcs. Although some switching devices have arc-extinguishing components between their contacts, mechanical switching devices are still used in high-voltage power distribution, especially for the high-voltage lines entering the control cabinet and the power lines exiting after distribution. Sometimes, after a disconnection command is given to the switching device, feedback on the line disconnection is not received in a timely manner. It becomes unclear whether the circuit remains open due to arcing after the switching device has activated, or whether the switch has not completed its operation. Therefore, control cabinets capable of diagnosing whether switching devices have activated are needed. Utility Model Content

[0003] The present invention aims to provide an electrical control cabinet with a fault self-diagnosis function to solve the problem that when it is necessary to disconnect a high-voltage line, the disconnection distance in the electrical control cabinet is insufficient, causing the switching components to fail to disconnect from the circuit.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: an electrical control cabinet with fault self-diagnosis function, comprising a high-voltage busbar connection chamber, a switch chamber, and a cable outlet chamber. A busbar connection post is installed in the busbar connection chamber, and a power connection post is installed in the cable outlet chamber. A first stationary contact is connected to the busbar connection post, and a second stationary contact is connected to the power connection post. A circuit breaker is provided in the switch chamber. The circuit breaker includes a support shell and a moving contact for disconnecting or connecting the first and second stationary contacts. One end of the moving contact passes through the support shell with a gap, and the other end is connected to a tripping assembly that allows it to trip instantaneously. A proximity switch is provided on the tripping assembly to detect its movement. A power cable is connected to the power connection post, and a current transformer is provided on the power cable. The electrical control cabinet also includes a local controller. The current transformer and proximity switch are connected to the input terminal of the local controller. The current transformer is used to collect electrical signals from the power cable, and the proximity switch is used to collect signals indicating whether the tripping assembly has tripped. The local controller automatically diagnoses whether the moving contact has properly disconnected from the first and second stationary contacts based on the signals from the current transformer and proximity switch.

[0005] The principle and advantages of this solution are as follows: The fault self-diagnosis electrical control cabinet of this application is mainly for electrical control cabinets that connect and disconnect high voltage in high voltage power distribution. The main switching device in the electrical control cabinet is the circuit breaker. Under normal power use, the current transformer collects whether there is current flowing through the power cable to determine whether the power supply is connected. When it is necessary to disconnect the circuit breaker, the proximity switch determines whether the tripping component has been activated, and at the same time, the current transformer judges whether there is current in the power cable, thereby completing the self-diagnosis of whether the circuit breaker disconnection is faulty.

[0006] If the proximity switch sends a signal, it indicates that the tripping component has activated. Under normal disconnection conditions, there should be no current in the current transformer. If there is still induced current in the current transformer, it indicates a fault in the circuit breaker. In this case, a forced power disconnection of the upstream transmission line is required.

[0007] Preferably, the electrical control cabinet also includes a control shielding room, in which the local controller is installed to prevent the control signal from being subjected to strong electrical interference.

[0008] Preferably, a transient ground voltage partial discharge sensor is installed on the inner wall of the control cabinet in the busbar connection compartment. The transient ground voltage partial discharge sensor is connected to the input terminal of the local controller and is used to detect whether there is a partial discharge in the control cabinet. If a partial discharge is present, the sensor transmits an analog signal to the local controller. After receiving the signal, the local controller controls the circuit breaker to disconnect the power circuit.

[0009] Preferably, the circuit breaker includes an operating lever for manually opening the trip assembly. The operating lever causes the trip assembly to trip, resulting in the retraction of the moving contact on the circuit breaker and disconnection from the first and second stationary contacts.

[0010] Preferably, a buffer spring is provided between the first stationary contact and the second stationary contact and the control cabinet. The buffer spring provides a buffer distance between the first stationary contact and the second stationary contact, preventing the moving contact from making hard contact with the first and second stationary contacts.

[0011] Preferably, an arc-extinguishing mechanism is provided between the moving contact and the first and second stationary contacts. The arc-extinguishing mechanism includes an insulating shell, one end of which is fitted onto the moving contact. Multiple layers of arc-extinguishing grids are provided inside the insulating shell, with an arc-absorbing sheet between adjacent layers of arc-extinguishing grids. The arc-extinguishing mechanism eliminates the arc generated when the distance between the moving and stationary contacts is too short, ensuring a complete disconnection between the moving and stationary contacts, thereby allowing the circuit breaker to normally disconnect the circuit.

[0012] Preferably, a heat-absorbing coil is connected to the end of the arc-absorbing sheet, and an insulating layer is wrapped around the heat-absorbing coil. The insulating layer is attached to a heat-conducting grid. The heat-absorbing coil absorbs the heat generated by the arc and releases the heat in a timely manner through the heat-conducting grid, thereby cooling the arc-absorbing sheet.

[0013] Preferably, an air conditioner is installed at the top of the switch compartment. The cooling effect of the air conditioner lowers the temperature of the circuit breaker section in the switch compartment, especially in summer, ensuring that the circuit breaker can be disconnected smoothly by maintaining a lower temperature at the circuit breaker location. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the electrical control cabinet;

[0015] Figure 2 This is a schematic diagram of the arc-extinguishing mechanism;

[0016] Figure 3 This is a schematic diagram of the arc-extinguishing mechanism from another perspective. Detailed Implementation

[0017] The following detailed description illustrates the specific implementation method:

[0018] The reference numerals in the accompanying drawings include: high-voltage busbar connection chamber A; switch chamber B; cable outlet chamber C; control shielding chamber D; high-voltage busbar 1; busbar connection post 2; air conditioner 3; proximity switch 4; moving contact 5; arc extinguishing mechanism 6; insulating shell 61; heat dissipation hole 62; arc extinguishing grid 63; arc absorbing sheet 64; heat absorption coil 65; heat conduction grid 66; first stationary contact 71; second stationary contact 72; buffer spring 8; circuit breaker 9; operating lever 10; transient ground voltage partial discharge sensor 11; current transformer 12; local controller 13; power connection post 14; tripping assembly 15.

[0019] The basic implementation examples are as follows: Figure 1 As shown: An electrical control cabinet with fault self-diagnosis function includes a high-voltage busbar connection room A, a switch room B, a cable outlet room C, and a control shield room D; an air circulation channel is left between the high-voltage busbar connection room A, the switch room B, and the cable outlet room C. An air conditioner 3 is installed on the top of the switch room B. The temperature inside the switch room B is regulated by the air conditioner 3, and the temperature inside the high-voltage busbar connection room A and the cable outlet room C is further diffused and regulated.

[0020] High-voltage busbar 1 is connected to the high-voltage busbar connection chamber A, and then controlled by the switch chamber B before finally being connected to the electrical equipment from the cable outlet chamber C.

[0021] The control shielding room D is coated with a special electromagnetic shielding material on the inner wall of the control cabinet. The local controller 13 is installed in the control shielding room D. The signal transmission and reception method is to send signals to the outside by a separate lead-out signal line.

[0022] Busbar connection column 2 is installed in busbar connection compartment A, and power connection column 14 is installed in cable outlet compartment C. The first stationary contact 71 of the busbar connection column 2 is connected to the second stationary contact 72 of the power connection column 14. Circuit breaker 9 is installed in switch compartment A. Circuit breaker 9 includes a support shell and a moving contact 5 for disconnecting or connecting the first and second stationary contacts. One end of the moving contact 5 passes through the support shell with a gap, and the other end is connected to a tripping assembly 15 that allows it to act instantaneously. An arc extinguishing mechanism 6 is provided between the moving contact 5 and the first and second stationary contacts.

[0023] The circuit breaker 9 includes an operating lever 10 for manually opening the trip assembly 15. The trip assembly is tripped by operating the lever 10, causing the moving contact 5 on the circuit breaker 9 to retract and disconnect from the first and second stationary contacts.

[0024] The tripping assembly 15 is equipped with a proximity switch 4 to detect its movement. The power connection post 14 is connected to a power cable, and the power cable is equipped with a current transformer 12. The current transformer 12 and the proximity switch 4 are connected to the input terminal of the local controller 13. The current transformer 12 is used to collect the electrical signal on the power cable, and the proximity switch 4 is used to collect the signal of whether the tripping assembly has been activated. The local controller 13 automatically diagnoses whether the moving contact 5 is properly disconnected from the first and second stationary contacts based on the signals from the current transformer 12 and the proximity switch 4.

[0025] The current transformer 12 collects whether there is current flowing through the power cable to determine whether the power supply is connected. When it is necessary to disconnect the circuit breaker 9, the proximity switch 4 determines whether the tripping component 15 has been activated, and at the same time, the current transformer 12 determines whether there is current in the power cable, thereby completing the self-diagnosis of whether there is a fault in the circuit breaker 9.

[0026] If proximity switch 4 has a signal, it indicates that tripping assembly 15 has activated. Under normal disconnection conditions, there is no current in current transformer 12. If there is still induced current in current transformer 12, it indicates a fault in circuit breaker 9. In this case, it is necessary to forcibly disconnect the upstream power transmission section.

[0027] A transient ground voltage partial discharge sensor 11 is installed on the inner wall of the control cabinet in busbar connection room A. The transient ground voltage partial discharge sensor 11 is connected to the input terminal of the local controller 13. The transient ground voltage partial discharge sensor 11 is used to detect whether there is a partial discharge in the control cabinet. If a partial discharge is present, the sensor sends an analog signal to the local controller 13. After receiving the signal, the local controller 13 controls the circuit breaker 9 to disconnect the power circuit.

[0028] In this implementation, a mechanical proximity switch can be used, which generates an electrical signal through contact with the tripping component. A Siemens S7 series PLC can be used as the local controller, and a high-voltage current transformer suitable for 1kV to 220kV is selected. The transient ground voltage partial discharge sensor can be the ST-JF600A model from Taisheng Electric.

[0029] A buffer spring 8 is provided between the first stationary contact 71 and the second stationary contact 72 and the control cabinet. The buffer spring 8 provides a buffer distance between the first stationary contact 71 and the second stationary contact 72, preventing the moving contact 5 from making hard contact with the first and second stationary contacts.

[0030] like Figure 2 and Figure 3 As shown, the arc-extinguishing mechanism 6 includes an insulating shell 61 with multiple heat dissipation holes 62. One end of the insulating shell 61 is fitted onto the moving contact 5. Multiple layers of arc-extinguishing grids 63 are provided inside the insulating shell 61, and arc-absorbing sheets 64 are provided between adjacent layers of arc-extinguishing grids 63. The arc-extinguishing mechanism eliminates the arc generated by the short distance between the moving and stationary contacts, ensuring a complete disconnection between the moving and stationary contacts, thereby enabling the circuit breaker to normally disconnect the circuit.

[0031] An arc-absorbing sheet 64 has a heat-absorbing coil 65 connected to its end. The heat-absorbing coil 65 is wrapped with an insulating layer, and a heat-conducting grid 66 is attached to the insulating layer. The heat-absorbing coil 65 absorbs the heat generated by the arc and releases the heat in a timely manner through the heat-conducting grid 66, thereby cooling the arc-absorbing sheet.

[0032] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An electrical control cabinet with a fault self-diagnosis function, comprising a high-voltage bus connection chamber, a switch chamber and a cable outlet chamber, a bus connection column is installed in the bus connection chamber, a power connection column is installed in the cable outlet chamber, a first static contact connected to the bus connection column, a second static contact connected to the power connection column, and a circuit breaker is arranged in the switch chamber, characterized in that: The circuit breaker comprises a supporting shell and a moving contact for disconnecting or connecting the first and second static contacts, one end of the moving contact is provided with a gap through the supporting shell, and the other end is connected with a tripping assembly for instantaneous action, the tripping assembly is provided with a proximity switch for detecting the movement thereof, the power connection column is connected with a power cable, the power cable is provided with a mutual inductor, the electrical control cabinet further comprises a local controller, the mutual inductor and the proximity switch are connected to the input end of the local controller, the mutual inductor is used for collecting the electrical signal on the power cable, and the proximity switch is used for collecting the action signal of the tripping assembly, and the local controller automatically diagnoses whether the moving contact and the first and second static contacts are normally disconnected according to the signals of the mutual inductor and the proximity switch.

2. The electrical control cabinet with fault self-diagnosis function according to claim 1, characterized in that: The control shielding room is further provided, and the local controller is installed in the control shielding room.

3. The electrical control cabinet with fault self-diagnosis function according to claim 2, characterized in that: The transient ground voltage partial discharge sensor is installed on the inner wall of the control cabinet of the bus connection room, the transient ground voltage partial discharge sensor is connected to the input end of the local controller, and the transient ground voltage partial discharge sensor is used for detecting whether there is a local discharge in the control cabinet.

4. The electrical control cabinet with a fault self-diagnosis function according to claim 3, characterized in that: The circuit breaker comprises an operating rod for manually opening the tripping assembly.

5. An electrical control cabinet with a fault self-diagnosis function according to claim 4, characterized in that: The first static contact and the second static contact are provided with a buffer spring between the control cabinet.

6. An electrical control cabinet with a fault self-diagnosis function according to claim 5, characterized in that: The moving contact and the first and second static contacts are provided with an arc extinguishing mechanism, the arc extinguishing mechanism comprises an insulating shell, one end of the insulating shell is sleeved on the moving contact, a plurality of layers of arc extinguishing grids are arranged in the insulating shell, and an arc absorbing sheet is arranged between adjacent two layers of arc extinguishing grids.

7. An electrical control cabinet with a fault self-diagnosis function according to claim 6, characterized in that: The arc absorbing sheet is connected with a heat absorbing coil at the tail end, the heat absorbing coil is wrapped with an insulating layer, and the insulating layer is attached to a heat conducting grid.

8. An electrical control cabinet with a fault self-diagnosis function according to claim 7, characterized in that: The top of the switch room is provided with an air conditioner.

Images