High-voltage cabinet grounding knife switch protection device for preventing reverse power transmission operation

Abstract

The invention discloses a high-voltage cabinet grounding knife switch protection device for preventing reverse power transmission operation. The high-voltage cabinet grounding knife switch protection device comprises a controller, an intermediate relay, a high-voltage cabinet grounding rotating mechanism link rod, an electromagnetic mechanism and a detection display, the detection display is used for enabling the output power high-voltage cable to be electrified and detecting an electrified abnormal signal when a reverse power transmission operation accident occurs in the high-voltage cabinet; the intermediate relay is used for receiving an electrification abnormal signal transmitted by the detected display, a coil of the intermediate relay is electrified, and the coil is closed through a normally open contact Z1-1 of the coil to send out a signal; the controller receives a signal sent by the intermediate relay, processes the signal and sends a control signal; the electromagnetic mechanism is electrified to act based on a control signal sent by the controller; the electromagnetic mechanism comprises a bayonet lock, and the bayonet lock extends out to clamp a high-voltage cabinet grounding mechanism link rod, so that the high-voltage cabinet grounding mechanism link rod cannot rotate, a high-voltage cabinet grounding knife switch cannot be switched on, and the effect of protecting and preventing live-line connection of the grounding knife switch is achieved.

Description

Technical Field

[0001] The invention belongs to the field of fully automated products and relates to a protective device for preventing a high-voltage cabinet from closing a grounding switch in a reverse power transmission operation. Background Art

[0002] High-voltage cabinets are indispensable equipment in the power system. They are mainly used for switching, controlling or protecting in the power system's power generation, transmission, distribution, power conversion and consumption. The main functions of high-voltage cabinets are overhead incoming and outgoing lines, cable incoming and outgoing lines, busbar liaison and other functions. The protection mainly includes five functions: preventing the closing of the switch with load, preventing the closing of the live grounding wire, preventing mistaken entry into the live interval, preventing the closing of the live grounding wire, and preventing the pulling of the knife switch with load, to ensure safe operation. The internal structure of the high-voltage cabinet includes: busbar room, which is used to install the busbar. Vacuum circuit breakers are installed in the trolley room. The voltage transformer room is mainly equipped with grounding devices and lightning arresters. The grounding knife switch of the high-voltage switch cabinet is a device used to achieve grounding protection in the high-voltage switch cabinet. However, the five-protection protection system of the high-voltage cabinet only has a protection device to prevent the live grounding wire from closing, but no protection device to close the grounding switch when reverse power is supplied. In this way, when reverse power is supplied, the high-voltage cabinet grounding switch can still be operated (closed). When reverse power is supplied, the high-voltage power output cable in the high-voltage cabinet is energized, and when the grounding switch is closed, electric shock and explosion accidents will occur. When reverse power is supplied, it is not easy for the operator to find it in time. Therefore, it is necessary to improve the grounding protection device system and form a protection device specially used for closing the grounding switch when reverse power is supplied in the high-voltage cabinet to ensure the safety of high-voltage cabinet operation. Summary of the invention

[0003] In order to solve the above problems, the technical solution adopted by the present invention is: a protective device for preventing reverse power transmission operation of high-voltage cabinet grounding switch, comprising:

[0004] Controller, intermediate relay, high voltage cabinet grounding rotating mechanism connecting rod, electromagnetic mechanism and detection display;

[0005] The detection display is used to energize the output power high-voltage cable when a reverse power transmission operation accident occurs in the high-voltage cabinet, and detects an abnormal signal of energization;

[0006] The intermediate relay is used to receive the abnormal power signal transmitted by the detected display, and the coil of the intermediate relay is energized, and through its normally open contact Z1-1, it is closed and sends a signal;

[0007] The controller receives the signal sent by the intermediate relay, processes it and sends a control signal;

[0008] The electromagnetic mechanism is electrically activated based on the control signal sent by the controller;

[0009] The electromagnetic mechanism comprises a latch pin, which extends out to latch the connecting rod of the high-voltage cabinet grounding mechanism, so that the connecting rod of the high-voltage cabinet grounding mechanism cannot rotate and the high-voltage cabinet grounding knife switch cannot be closed, thereby playing a role in protecting and preventing live connection of the grounding knife.

[0010] Furthermore: it also includes an audible and visual alarm, which is used to receive the alarm signal sent by the controller and perform electric, audible and visual alarm.

[0011] Furthermore: the electromagnetic mechanism includes an electromagnetic coil, which is used to control the connecting rod of the high-voltage cabinet grounding mechanism.

[0012] Furthermore: the controller adopts a programmable controller.

[0013] Furthermore: it also includes a monitoring display for monitoring the alarm status of the sound and light alarm.

[0014] Furthermore: it also includes an operation indicator light, which is used to receive the signal transmitted by the controller and display the operation of the controller.

[0015] Furthermore: the intermediate relay is arranged in the control box, and the intermediate relay is connected with the controller and the detection display through a cable.

[0016] The present invention provides a protective device for preventing reverse power supply operation of a high-voltage cabinet from closing a grounding knife switch. The protective device has a simple structure, a reasonable design, and is easy to use. The device has the characteristics of good effect, high efficiency, simple operation, and low cost. The use of the device has low investment and stable equipment operation, which ensures the safe operation of the high-voltage cabinet and the smooth production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a schematic structural diagram of a high-voltage cabinet grounding switch protection device for preventing reverse power transmission operation according to the present invention;

[0019] Figure 2 It is a module diagram of this device.

[0020] Figure numerals: 1. monitoring display, 2. sound and light alarm, 3. operation indicator light, 4. electromagnetic coil, 5. controller, 6. intermediate relay, 8. detection display, 9. solenoid valve telescopic rod latch, 12. high-voltage cabinet grounding rotation mechanism connecting rod. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Figure 1 It is a schematic structural diagram of a high-voltage cabinet grounding switch protection device for preventing reverse power transmission operation according to the present invention;

[0024] Figure 2 It is a module diagram of this device.

[0025] A protective device for preventing reverse power transmission of a high-voltage cabinet from closing a grounding knife switch, the device for preventing reverse power transmission of a high-voltage cabinet from closing a grounding knife switch is intended to solve the problem of personal injury and damage to electrical equipment caused by reverse power transmission of the high-voltage cabinet.

[0026] A protective device for preventing reverse power transmission operation of a high-voltage cabinet from closing a grounding knife switch, comprising:

[0027] Controller 5, intermediate relay 6, high voltage cabinet grounding rotating mechanism connecting rod 12, electromagnetic mechanism and detection display 8;

[0028] The live display is used to energize the output power high-voltage cable when a reverse power transmission operation accident occurs in the high-voltage cabinet, detect the live abnormal signal, and display the detected abnormal signal at the same time;

[0029] The intermediate relay 6 is used to receive the abnormal power signal transmitted by the power display, and the coil of the intermediate relay 6 is energized, and through its normally open contact Z1-1, it is closed and sends a signal;

[0030] The controller 5 receives the signal sent by the intermediate relay 6, processes it and sends a control signal;

[0031] The electromagnetic mechanism is electrically activated based on the control signal sent by the controller 5;

[0032] The electromagnetic mechanism comprises a latch pin, which extends out to latch the high-voltage cabinet grounding knife switch rotating device mechanism link rod 12, so that it cannot rotate and the high-voltage cabinet grounding knife switch cannot be closed, thereby playing a role in protecting and preventing the live (connected) grounding knife from being closed.

[0033] The device also includes an audible and visual alarm 2, which is used to receive the alarm signal sent by the controller 5 and perform electric, audible and visual alarm.

[0034] Furthermore: the electromagnetic mechanism includes an electromagnetic coil 4, which is used to control the connecting rod 12 of the high-voltage cabinet grounding mechanism.

[0035] Furthermore: the controller 5 adopts a programmable controller 5 or a relay, etc.

[0036] Furthermore: the device also includes a monitoring display 1, which is used to monitor the alarm situation of the sound and light alarm 2 and display the alarm situation.

[0037] Furthermore: the device also includes an operation indicator light 3 for receiving a signal transmitted by the controller 5 and displaying the operation of the controller 5 .

[0038] The intermediate relay 6 is arranged in the control box, and the intermediate relay 6 is connected to the controller 5 and the detection display 8 through a cable. When the detection display 8 collects an abnormally charged signal, it is transmitted to the coil of the intermediate relay 6, and the coil of the intermediate relay 6 is attracted. The intermediate relay 6 is arranged between the high-voltage cabinet ground knife rotating mechanism and the electromagnetic mechanism;

[0039] Furthermore, the sound and light alarm 2 uses a flashing light and an alarm bell, is installed in a control room, and the control signal is transmitted by an optical cable and controls the on and off of the solenoid valve.

[0040] In the voltage transformer room of the high-voltage cabinet, an electromagnetic mechanism is installed above the rear end of the grounding knife switch rotating device mechanism, and a clamp is installed on the rear end shaft of the grounding knife switch rotating mechanism. When the high-voltage cabinet does not reverse power, the electromagnetic mechanism coil loses power, the electromagnetic rod clamping pin shrinks in the electromagnetic coil 4, and the grounding knife switch rotating mechanism can rotate. An intermediate relay 6 is installed in the cabinet, and the intermediate relay 6 coil is connected to the high-voltage cabinet live display power supply. When the reverse power transmission operation occurs, the high-voltage cabinet power output cable is energized, and a 100V voltage is generated through the live display, so that the intermediate relay 6 coil is energized, the intermediate relay 6 normally opens Z1-1 (closed), and the 220v DC power supply is supplied to the electromagnetic coil 4 through the controller 5. The electromagnetic coil 4 is energized to extend the extension and contraction link 12, which is stuck on the clamp at the rear end of the grounding knife switch rotating mechanism, so that the high-voltage cabinet grounding knife switch rotating mechanism cannot rotate, and the grounding knife switch in the high-voltage cabinet cannot be closed, so that effective protection can be provided to prevent the live (connected) closing of the grounding knife switch.

[0041] When the high-voltage distribution cabinet is normally energized, the feed power cable of the high-voltage cabinet is also energized. The five protections of the high-voltage cabinet include the protection of the energized closing grounding device, so the grounding switch cannot be operated. However, in order to prevent the solenoid valve coil from being easily damaged due to long-term energization, a closed point can be added to the intermediate relay 6. When the vacuum circuit breaker is closed, the closed point Z1-2 is disconnected to cut off the power to the electromagnetic coil 4.

[0042] like Figure 2 As shown, in the above technical scheme, an intermediate relay 6 is installed between the grounding rotating device and the electromagnetic mechanism of the high-voltage cabinet, connected to the controller 5 and the sound and light alarm 2. When a reverse power supply operation accident occurs, the output power cable of the high-voltage cabinet is energized. The abnormal power supply signal is detected by the detection display 8 and transmitted to the intermediate relay 6. The coil of the intermediate relay 6 is energized, and its normally open contact Z1-1 (closed) sends a signal to the controller 5. The controller 5 receives and processes the signal, so that the electromagnetic coil 4 of the electromagnetic mechanism is energized and actuated, and the grounding knife switch rotating mechanism clamp is stuck so that it cannot be operated, and the grounding knife switch cannot be closed. At the same time, the sound and light alarm 2 sends a reverse power supply alarm to remind the staff that the high-voltage cable is energized.

[0043] When the high-voltage distribution cabinet is normally energized, the high-voltage power cable of the high-voltage cabinet is also energized. The five protections of the high-voltage cabinet include the protection of the energized closing grounding device, so the grounding switch cannot be operated. However, in order to prevent the solenoid valve coil from being easily damaged due to long-term energization, a closed point Z1-2 is added to the intermediate relay 6. When the vacuum circuit breaker is closed, the closed point Z1-2 is disconnected, so that the electromagnetic coil 4 is de-energized, thereby protecting the electromagnetic coil 4.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A protective device for preventing reverse power transmission operation of high-voltage cabinet grounding switch, characterized in that: include: Controller, intermediate relay, high voltage cabinet grounding rotating mechanism connecting rod, electromagnetic mechanism and detection display; The detection display is used to energize the output power high-voltage cable when a reverse power transmission operation accident occurs in the high-voltage cabinet, and detects an abnormal signal of energization; The intermediate relay is used to receive the abnormal power signal transmitted by the detected display, and the coil of the intermediate relay is energized, and through its normally open contact Z1-1, it is closed and sends a signal; The controller receives the signal sent by the intermediate relay, processes it and sends a control signal; The electromagnetic mechanism is electrically activated based on the control signal sent by the controller; The electromagnetic mechanism comprises a latch pin, which extends out to latch the connecting rod of the high-voltage cabinet grounding mechanism, so that the connecting rod of the high-voltage cabinet grounding mechanism cannot rotate and the high-voltage cabinet grounding knife switch cannot be closed, thereby playing a role in protecting and preventing live connection of the grounding knife.

2. A protective device for preventing reverse power transmission operation of high-voltage cabinet grounding switch according to claim 1, characterized in that: It also includes an audible and visual alarm, which is used to receive the alarm signal sent by the controller and perform electric, audible and visual alarm.

3. A protective device for preventing reverse power transmission operation of high-voltage cabinet grounding switch according to claim 1, characterized in that: The electromagnetic mechanism comprises an electromagnetic coil, which is used to control the connecting rod of the grounding mechanism of the high-voltage cabinet.

4. A protective device for preventing reverse power transmission operation of high-voltage cabinet grounding switch according to claim 1, characterized in that: The controller adopts a programmable controller.

5. A protective device for preventing reverse power transmission operation of high-voltage cabinet grounding switch according to claim 2, characterized in that: It also includes a monitoring display for monitoring the alarm status of the sound and light alarm.

6. A protective device for preventing reverse power transmission operation of high-voltage cabinet grounding switch according to claim 1, characterized in that: It also includes an operation indicator light, which is used to receive the signal transmitted by the controller and display the operation of the controller.

7. A protective device for preventing reverse power transmission operation of high-voltage cabinet grounding switch according to claim 1, characterized in that: The intermediate relay is arranged in the control box, and the intermediate relay is connected with the controller and the detection display through a cable.

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