High-voltage switchgear, high-voltage switchgear grounding system and high-voltage switchgear grounding method

Abstract

The present invention discloses a high-voltage switchgear, a grounding system for high-voltage switchgear, and a grounding method for high-voltage switchgear. The high-voltage switchgear includes a circuit breaker, a grounding switch, a linkage module, and an indicator light: the circuit breaker is used to connect the upper-level line and the lower-level line; the grounding switch is electrically connected to the lower-level line and is used to ground the lower-level line; the linkage module is linked with the grounding switch and the circuit breaker, and the linkage module is used to output the grounding state of the grounding switch and receive the on-off control signal for controlling the on-off of the circuit breaker; the indicator light is electrically connected to the linkage module and is used to indicate the grounding state. The grounding system for high-voltage switchgear includes the above-mentioned high-voltage switchgear and a power monitoring module, and the power monitoring module is signal-connected to the linkage module. The power monitoring module is used to receive and display the grounding state and to send the on-off control signal. The high-voltage switchgear, the grounding system for high-voltage switchgear, and the grounding method for high-voltage switchgear of the present invention can improve the operation efficiency and enhance the safety of the high-voltage switchgear.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission, and particularly relates to a high-voltage switchgear, a grounding system for a high-voltage switchgear, and a grounding method for a high-voltage switchgear. Background Art

[0002] High-voltage switchgears are generally used to conduct and separate the connection between the upper-level line and the lower-level line. When the high-voltage switchgear is overhauled or related operations are carried out, grounding the lower-level line is a necessary safety technical measure. According to the five-prevention requirements, in order to avoid short circuits and electric leakage in the upper-level line, mechanical interlocks are provided for both the grounding knife switch and the circuit breaker trolley position of the high-voltage switchgear to prevent the grounding knife switch and the circuit breaker from being conducted simultaneously. However, the existing high-voltage switchgears often lack obvious warning signals for the grounding situation of the lower-level line, so that operators need to judge the grounding situation through the operation window and experience, resulting in a decrease in work efficiency and there is also a certain risk of misjudgment. When the mechanical interlock device fails, there may also be a certain risk of misoperation. Therefore, there are safety hazards in the existing high-voltage switchgears during switching operations. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a high-voltage switchgear, a grounding system for a high-voltage switchgear, and a grounding method for a high-voltage switchgear, which can improve the operation efficiency, reduce the safety hazards of switching operations, and improve the safety of the high-voltage switchgear.

[0004] The high-voltage switchgear according to the first aspect embodiment of the present invention includes:

[0005] A circuit breaker for connecting the upper-level line and the lower-level line;

[0006] A grounding knife switch electrically connected to the lower-level line, and the grounding knife switch is used to ground the lower-level line;

[0007] A linkage module linked with the grounding knife switch and the circuit breaker, and the linkage module is used to output the grounding state of the grounding knife switch and receive the on-off control signal for controlling the on-off of the circuit breaker;

[0008] An indicator light electrically connected to the linkage module for indicating the grounding state.

[0009] The high-voltage switchgear according to the first aspect embodiment of the present invention has at least the following beneficial effects:

[0010] The high-voltage switch cabinet of the present invention comprises a circuit breaker, a grounding knife switch, a linkage module and an indicator light, wherein the circuit breaker is arranged on a trolley, and the trolley is detachably connected to the cabinet body of the high-voltage switch cabinet. The circuit breaker can be moved by the trolley, so that the circuit breaker is connected in series between the upper circuit and the lower circuit, and the circuit breaker is separated from the upper circuit and the lower circuit. When the circuit breaker is connected in series between the upper circuit and the lower circuit, the switch on the circuit breaker can control the conduction and disconnection between the upper circuit and the lower circuit. The grounding knife switch is electrically connected to the lower circuit, so that the lower circuit can be grounded to avoid electric shock to the operator during operation. The linkage module is linked with the grounding knife switch to obtain the grounding state of the grounding knife switch, and the linkage module is electrically connected to the indicator light. The linkage module controls the on and off of the indicator light according to the grounding state of the grounding knife switch, so that the operator can be clearly reminded of the grounding condition of the lower circuit, improve the operation efficiency, reduce the safety hazards of the switching operation, and improve the safety of the high-voltage switch cabinet. The linkage module is linked with the circuit breaker according to the grounding state of the grounding switch. When the grounding switch is in the on state, the linkage module maintains the circuit breaker in the off state. When the grounding switch is in the off state, the linkage module controls the on and off of the circuit breaker according to the received on-off control signal, thereby realizing the electrical interlocking of the grounding switch and the circuit breaker, preventing the grounding switch and the circuit breaker from being in the on state at the same time, avoiding the occurrence of short circuit and leakage, reducing the safety hazards of switching operations, and improving the safety of high-voltage switchgear.

[0011] According to some embodiments of the present invention, the linkage module includes an auxiliary switch and a relay protection device, the auxiliary switch is transmission-connected to the grounding switch, the auxiliary switch is electrically connected to the relay protection device and the indicator light, the relay protection device is electrically connected to the circuit breaker through the auxiliary switch, and the relay protection device is used to output the grounding state and receive the on / off control signal.

[0012] According to some embodiments of the present invention, the auxiliary switch is provided with a first normally open contact and a second normally open contact, the relay protection device is provided with a switch quantity input unit, the first normally open contact and the second normally open contact are linked with the earthing switch, the first normally open contact is connected in series with the indicator light, and the second normally open contact is connected in series with the switch quantity input unit.

[0013] According to some embodiments of the present invention, the circuit breaker is provided with a closing coil, the auxiliary switch is provided with a normally closed contact, the normally closed contact is linked with the grounding switch, and the relay protection device is provided with a first switch output unit, and the first switch output unit, the normally closed contact and the closing coil are connected in series.

[0014] According to some embodiments of the present invention, the relay protection device is provided with a second switch value output unit, and the second switch value output unit is used to output the grounding state.

[0015] According to some embodiments of the present invention, the relay protection device is provided with a communication interface, and the communication interface is used to send the grounding state and receive the on-off control signal.

[0016] The high-voltage switchgear grounding system according to the second aspect embodiment of the present invention includes:

[0017] The high-voltage switchgear of the above-mentioned first aspect embodiment;

[0018] A power monitoring module, which is signal-connected to the linkage module. The power monitoring module is used to receive and display the grounding state and send the on-off control signal.

[0019] The high-voltage switchgear grounding system according to the second aspect embodiment of the present invention has at least the following beneficial effects:

[0020] The high-voltage switchgear grounding system of the present invention includes a power monitoring module and the high-voltage switchgear of the above-mentioned first aspect embodiment. The power monitoring module is electrically connected to the linkage module. The power monitoring module can receive the grounding state of the grounding switch from the linkage module and display the grounding state of the grounding switch. Through the power monitoring module, an on-off control signal can be sent to the linkage module, thereby realizing remote control. Through the power monitoring module, the grounding state of the grounding switch can be observed intuitively and in real time, preventing the grounding switch and the circuit breaker from being in the on state at the same time, avoiding the occurrence of short circuits and electric leakage, reducing the safety hazards of switching operations while improving the operation efficiency, and improving the safety of the high-voltage switchgear. In addition, the high-voltage switchgear grounding system uses the high-voltage switchgear of the above-mentioned first aspect embodiment. The linkage module is linked with the circuit breaker according to the grounding state of the grounding switch. When the grounding switch is in the on state, the linkage module keeps the circuit breaker in the off state. At this time, the on-off control signal sent by the power monitoring module cannot change the on-off state of the circuit breaker, thus avoiding the situation that the grounding switch and the circuit breaker are in the on state at the same time due to misoperation of the power monitoring module, preventing the occurrence of short circuits and electric leakage, reducing the safety hazards of switching operations, and improving the safety of the high-voltage switchgear.

[0021] The high-voltage switchgear grounding method according to the third aspect embodiment of the present invention is applied to a high-voltage switchgear grounding system. The high-voltage switchgear grounding system includes a circuit breaker, a grounding switch, a linkage module, an indicator light and a power monitoring module. The circuit breaker is used to connect the upper-level line and the lower-level line. The grounding switch is electrically connected to the lower-level line. The linkage module is linked with the grounding switch and the circuit breaker. The indicator light is electrically connected to the linkage module. The power monitoring module is signal-connected to the linkage module;

[0022] The high-voltage switchgear grounding method includes:

[0023] The linkage module responds to the grounding state of the grounding switch, outputs a grounding signal, and controls the indicator light to turn on and off;

[0024] The power monitoring module responds to the grounding signal and displays the grounding state and the control interface of the circuit breaker;

[0025] The power monitoring module responds to the grounding signal and the first control signal and outputs a second control signal;

[0026] The linkage module responds to the second control signal and the grounding state and controls the circuit breaker to conduct and open.

[0027] The high-voltage switchgear grounding method according to the third aspect embodiment of the present invention has at least the following beneficial effects:

[0028] The grounding method of the high-voltage switchgear of the present invention is applied to the grounding system of the high-voltage switchgear. The grounding system of the high-voltage switchgear includes a circuit breaker, a grounding switch, a linkage module, an indicator light, and a power monitoring module. Through the grounding method of the high-voltage switchgear of the present invention, the linkage module can control the lighting and extinguishing of the indicator light according to the grounding state of the grounding switch, so as to clearly warn the operating personnel of the grounding state of the grounding switch and improve the operating efficiency of the operating personnel. The linkage module outputs a grounding signal containing grounding state information to the power monitoring module, and the power monitoring module displays the grounding state of the grounding switch on the control interface, enabling the grounding state of the grounding switch to be observed intuitively and in real time, preventing the grounding switch and the circuit breaker from being in the conducting state at the same time, avoiding the occurrence of short circuits and electric leakage, and improving the operating efficiency of the operating personnel. By inputting a first control signal to the power monitoring module through the control interface of the power monitoring module, the power monitoring module outputs a second control signal to the linkage module according to the grounding signal output by the linkage module, and the linkage module responds to the second control signal and controls the on-off of the circuit breaker, thereby achieving the purpose of remote control. The second control signal output by the power monitoring module to the linkage module depends on the first control signal and the grounding signal, that is, on the on-off control instruction of the circuit breaker and the grounding state of the grounding switch: when the grounding switch is in the conducting state, the second control signal sent by the power monitoring module keeps the circuit breaker in the open state to prevent the grounding switch and the circuit breaker from being in the conducting state at the same time; when the grounding switch is in the open state, the second control signal sent by the power monitoring module enables the linkage module to control the on-off of the circuit breaker according to the second control signal. The power monitoring module avoids the occurrence of short circuits and electric leakage by means of soft interlocking of the grounding switch and the circuit breaker. The linkage module controls the on-off of the circuit breaker according to the grounding state of the grounding switch: when the grounding switch is in the conducting state, the linkage module keeps the circuit breaker in the open state; when the grounding switch is in the open state, the linkage module controls the conduction and interruption of the circuit breaker according to the second control signal. The linkage module realizes the electrical interlock between the grounding switch and the circuit breaker, preventing the grounding switch and the circuit breaker from being in the conducting state at the same time and avoiding the occurrence of short circuits and electric leakage. Thus, it can be seen that the grounding method of the high-voltage switchgear of the present invention can improve the safety of the high-voltage switchgear and reduce the potential safety hazards of switching operations.

[0029] According to some embodiments of the present invention, the linkage module includes an auxiliary switch and a relay protection device. The auxiliary switch is provided with a first normally open contact, a second normally open contact, and a normally closed contact. The first normally open contact, the second normally open contact, and the normally closed contact are linked with the earthing switch. The relay protection device is provided with a digital input unit, a first digital output unit, a second digital output unit, and a communication interface. The circuit breaker is provided with a closing coil. The first normally open contact is connected in series with the indicator light. The second normally open contact is connected in series with the digital input unit. The first digital output unit, the normally closed contact, and the closing coil are connected in series. The communication interface is in signal connection with the power monitoring module;

[0030] The linkage module responds to the earthing state of the earthing switch, outputs an earthing signal, and controls the indicator light to turn on and off, including at least one of the following:

[0031] When the earthing switch is conducting, the second normally open contact closes and triggers the digital input unit. The second digital output unit outputs a conducting state signal. The communication interface sends an earthing wire conducting signal. The first normally open contact closes, and the indicator light turns on;

[0032] When the earthing switch is open, the second normally open contact opens and triggers the digital input unit. The second digital output unit outputs an open state signal. The communication interface sends an earthing wire open signal. The first normally open contact opens, and the indicator light turns off.

[0033] According to some embodiments of the present invention, the power monitoring module responds to the earthing signal and the first control signal, and outputs a second control signal, including at least one of the following:

[0034] When the earthing signal is the earthing wire conducting signal and the first control signal is the first open command signal, the power monitoring module sends a maintenance command signal to the communication interface;

[0035] When the earthing signal is the earthing wire conducting signal and the first control signal is the first conducting command signal, the power monitoring module sends the maintenance command signal to the communication interface;

[0036] When the earthing signal is the earthing wire open signal and the first control signal is the first open command signal, the power monitoring module sends a second open command signal to the communication interface;

[0037] When the earthing signal is the earthing wire open signal and the first control signal is the first conducting command signal, the power monitoring module sends a second conducting command signal to the communication interface;

[0038] The linkage module controls the conduction and interruption of the circuit breaker in response to the second control signal and the grounding state, including at least one of the following:

[0039] When the grounding switch is conducting and the second control signal is the maintenance command signal, the normally closed contact opens, the first switch quantity output unit is interrupted, the closing coil loses power, and the circuit breaker is interrupted;

[0040] When the grounding switch is interrupted and the second control signal is the second interruption command signal, the normally closed contact closes, the first switch quantity output unit is interrupted, the closing coil loses power, and the circuit breaker is interrupted;

[0041] When the grounding switch is interrupted and the second control signal is the second conduction command signal, the normally closed contact closes, the first switch quantity output unit conducts, the closing coil is energized, and the circuit breaker conducts.

[0042] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0043] The above and / or additional aspects and advantages of the present invention will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0044] Figure 1 The principle block diagram of the high-voltage switchgear provided for an embodiment of the present invention;

[0045] Figure 2 The principle block diagram of the high-voltage switchgear provided for another embodiment of the present invention;

[0046] Figure 3 The principle block diagram of the high-voltage switchgear provided for another embodiment of the present invention;

[0047] Figure 4 The circuit diagram of the auxiliary switch of the high-voltage switchgear provided for an embodiment of the present invention;

[0048] Figure 5 The circuit diagram of the connection between the auxiliary switch and the indicator light of the high-voltage switchgear provided for an embodiment of the present invention;

[0049] Figure 6 The circuit diagram of the connection between the auxiliary switch and the relay protection device of the high-voltage switchgear provided for an embodiment of the present invention;

[0050] Figure 7 The circuit diagram of the connection between the auxiliary switch and the relay protection device and the circuit breaker of the high-voltage switchgear provided for an embodiment of the present invention;

[0051] Figure 8 The principle block diagram of the grounding system of the high-voltage switchgear provided for an embodiment of the present invention;

[0052] Figure 9 The schematic diagram of the control interface of the power monitoring module of the grounding system of the high-voltage switchgear provided for an embodiment of the present invention;

[0053] Figure 10 The schematic diagram of the grounding method of the high-voltage switchgear provided for an embodiment of the present invention;

[0054] Figure 11 The schematic diagram of the grounding method of the high-voltage switchgear provided for another embodiment of the present invention;

[0055] Figure 12 The schematic diagram of the grounding method of the high-voltage switchgear provided for another embodiment of the present invention;

[0056] Figure 13 The schematic diagram of the grounding method of the high-voltage switchgear provided for another embodiment of the present invention. Detailed implementation manners

[0057] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0058] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0059] In the description of the present invention, unless otherwise clearly defined, words such as setting and connecting should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0060] The high-voltage switchgear according to the first aspect embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0061] Refer to Figure 1, an embodiment of the present invention provides a high-voltage switchgear, which includes a circuit breaker 100, an earthing switch 200, a linkage module 300 and an indicator light 400. The circuit breaker 100 is arranged on a trolley, and the trolley is detachably connected to the cabinet body of the high-voltage switchgear. The circuit breaker 100 can be moved through the trolley, so that the circuit breaker 100 is connected in series between the upper-level line and the lower-level line and separated from the upper-level line and the lower-level line. When the circuit breaker 100 is connected in series between the upper-level line and the lower-level line, the conduction and interruption between the upper-level line and the lower-level line can be controlled through the switch on the circuit breaker 100. The earthing switch 200 is electrically connected to the lower-level line and can ground the lower-level line to avoid electric shock to the operator during operation. The linkage module 300 is linked with the earthing switch 200 and can obtain the earthing state of the earthing switch 200. The linkage module 300 is electrically connected to the indicator light 400, and the linkage module 300 controls the on and off of the indicator light 400 according to the earthing state of the earthing switch 200, so as to clearly remind the operator of the earthing situation of the lower-level line, improve the operation efficiency, reduce the potential safety hazards of switching operations, and improve the safety of the high-voltage switchgear. The linkage module 300 is linked with the circuit breaker 100 according to the earthing state of the earthing switch 200. When the earthing switch 200 is in the conducting state, the linkage module 300 keeps the circuit breaker 100 in the open state. When the earthing switch 200 is in the open state, the linkage module 300 controls the conduction and interruption of the circuit breaker according to the received on-off control signal, so as to realize the electrical interlock between the earthing switch 200 and the circuit breaker 100, prevent the earthing switch 200 and the circuit breaker 100 from being in the conducting state at the same time, avoid the occurrence of short circuit and electric leakage, reduce the potential safety hazards of switching operations, and improve the safety of the high-voltage switchgear.

[0062] Refer to Figure 2Another embodiment of the present invention provides a high-voltage switch cabinet. On the basis of the above embodiment, the linkage module 300 includes an auxiliary switch 310 and a relay protection device 320. The auxiliary switch 310 is connected to the grounding knife switch 200 through a connecting rod mechanism. The on and off of the auxiliary switch 310 is synchronized with the state change of the grounding knife switch 200. The auxiliary switch 310 reflects the grounding state of the grounding knife switch 200. The relay protection device 320 is electrically connected to the auxiliary switch 310. After detecting the on and off of the auxiliary switch 310, the relay protection device 320 outputs the grounding state of the grounding knife switch 200, realizes the collection of the grounding state information of the grounding knife switch 200, and enables the grounding state of the grounding knife switch 200 to be transmitted to other power monitoring equipment to realize remote monitoring. The auxiliary switch 310 is electrically connected to the indicator light 400. When the auxiliary switch 310 is connected in series to the current path of the indicator light 400, the on and off of the indicator light 400 can be directly controlled by the on and off of the auxiliary switch 310. The relay protection device 320 can receive the on-off control signal for controlling the on-off of the circuit breaker 100. The output end of the relay protection device 320 is electrically connected to the circuit breaker 100 through the auxiliary switch 310. The relay protection device 320 and the auxiliary switch 310 jointly control the on-off of the circuit breaker 100 to achieve remote control. The auxiliary switch 310 of this embodiment is linked with the grounding knife 200, and the grounding state of the grounding knife 200 is reflected by the auxiliary switch 310, and the indicator light 400 and the circuit breaker 100 are controlled by the auxiliary switch 310. The grounding knife 200 forms an electrical interlock with the circuit breaker 100 through the auxiliary switch 310, so as to prevent the grounding knife 200 and the circuit breaker 100 from being in the on state at the same time, and avoid the occurrence of short circuit and leakage. It can be seen that the circuit structure of this embodiment is simple, easy to implement, can reduce the control cost, and reduce the safety hazards of the switching operation; the high-voltage switch cabinet of this embodiment can communicate with other power monitoring equipment to achieve remote control and improve the safety of the high-voltage switch cabinet.

[0063] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7, Another embodiment of the present invention provides a high-voltage switchgear. On the basis of the above embodiment, the auxiliary switch 310 is provided with a first normally open contact 311 and a second normally open contact 312, and the relay protection device 320 is provided with a switch quantity input unit 321. The first normally open contact 311 and the second normally open contact 312 are linked with the earthing switch 200: when the earthing switch 200 is in the conducting state, the first normally open contact 311 and the second normally open contact 312 are closed; when the earthing switch 200 is in the open state, the first normally open contact 311 and the second normally open contact 312 are open. The first normally open contact 311 and the indicator lamp 400 are connected in series between the positive and negative poles of the control power supply small busbar. When the earthing switch 200 is in the conducting state, the first normally open contact 311 is closed and the indicator lamp 400 lights up; when the earthing switch 200 is in the open state, the first normally open contact 311 is open and the indicator lamp 400 goes out. The second normally open contact 312 and the switch quantity input unit 321 are connected in series between the positive and negative poles of the control power supply small busbar. The switch quantity input unit 321 is provided with an optocoupler element. When the earthing switch 200 is in the conducting state, the second normally open contact 312 is closed, the optocoupler element is powered on, and the output level of the optocoupler element changes. The relay protection device 320 can obtain the earthing state of the earthing switch 200 by detecting the output level of the optocoupler element. For example, when the second normally open contact 312 is closed, the optocoupler element outputs a low level, and the relay protection device 320 detects that the earthing state of the earthing switch 200 is conducting; when the second normally open contact 312 is open, the optocoupler element outputs a high level, and the relay protection device 320 detects that the earthing state of the earthing switch 200 is open. It can be seen that the circuit structure of this embodiment is simple, easy to realize the control of the indicator lamp 400 and the detection of the earthing state of the earthing switch 200, saving the control cost; the relay protection device 320 plays a role in isolating the high-voltage switchgear and other power monitoring devices, preventing other power monitoring devices from being damaged by high voltage.

[0064] Further, the circuit breaker 100 is provided with a closing coil 110, the auxiliary switch 310 is provided with a normally closed contact 313, and the relay protection device 320 is provided with a first switch quantity output unit 322. The normally closed contact 313 is interlocked with the earthing switch 200: when the earthing switch 200 is in the conducting state, the normally closed contact 313 is opened; when the earthing switch 200 is in the open state, the normally closed contact 313 is closed. The first switch quantity output unit 322, the normally closed contact 313 and the closing coil 110 are connected in series between the positive and negative poles of the control power supply busbar. When the earthing switch 200 is in the conducting state, the normally closed contact 313 is opened, and at this time, whether the first switch quantity output unit 322 is in the conducting state or the open state, the closing coil 110 is in the power-off state, and the circuit breaker 100 is open. When the earthing switch 200 is in the open state, the normally closed contact 313 is closed: if the first switch quantity output unit 322 is conducting, the closing coil 110 is powered on, and the circuit breaker 100 is conducting; if the first switch quantity output unit 322 is open, the closing coil 110 is powered off, and the circuit breaker 100 is open. In this embodiment, by connecting the closing coil 110 of the circuit breaker 100 and the normally closed contact 313 of the auxiliary switch 310 in series to form an interlock circuit between the earthing switch 200 and the circuit breaker 100, when the earthing switch 200 is conducting, the circuit breaker 100 cannot be made to conduct either through the local switch of the circuit breaker 100 or through the remote control port of the circuit breaker 100, preventing the circuit breaker 100 and the earthing switch 200 from conducting simultaneously and avoiding the occurrence of short circuits and electric leakage. The first switch quantity output unit 322 of the relay protection device 320 is connected in series with the closing coil 110 of the circuit breaker 100. On the premise that the normally closed contact 313 is closed, that is, the earthing switch 200 is open, by changing the on-off state of the first switch quantity output unit 322, the on-off of the circuit breaker 100 can be controlled, thereby realizing remote control and improving the safety of the high-voltage switchgear and reducing the potential safety hazards of switching operations.

[0065] Further, the relay protection device 320 is provided with a second switch quantity output unit 323. The relay protection device 320 detects the earthing state of the earthing switch 200 through the switch quantity input unit 321 and outputs the earthing state of the earthing switch 200 through the second switch quantity output unit 323. Specifically, when the earthing switch 200 is conducting, the second switch quantity output unit 323 is conducting, and when the earthing switch 200 is open, the second switch quantity output unit 323 is open. The relay protection device 320 reflects the earthing state of the earthing switch 200 through the second switch quantity output unit 323. The second switch quantity output unit 323 can be connected in series with the power supply line, signal line or other lines with specific functions of other equipment or devices and control the on-off of these lines, thereby realizing the interlock between the earthing switch 200 and these equipment or devices, and the relay protection device 320 makes the high-voltage switchgear of this embodiment have good scalability.

[0066] Furthermore, the relay protection device 320 is provided with a communication interface 324, and the relay protection device 320 can be connected to other power monitoring equipment signals through the communication interface 324. The relay protection device 320 sends the grounding state of the grounding knife 200 to other power monitoring equipment through the communication interface 324, and obtains the on-off control signal sent by other power monitoring equipment for controlling the on-off of the circuit breaker 100 through the communication interface 324, thereby realizing remote monitoring and remote control, improving the safety of the high-voltage switch cabinet and reducing the safety hazards of the switching operation. In this embodiment, the communication interface 324 is an RS485 bus interface, and the communication interface 324 communicates with other power monitoring equipment through the RS485 bus.

[0067] It should be noted that the communication interface 324 can also be a wired interface such as Ethernet, CAN bus, SPI bus and I2C bus, or a wireless interface such as WIFI, Bluetooth, ZigBee and mobile communication network. This embodiment is used to illustrate the technical solution of the present invention rather than to limit the implementation form of the communication interface 324. It should also be noted that the auxiliary switch 310, the first normally open contact 311, the second normally open contact 312 and the normally closed contact 313 can be a mechanical switch composed of a knife switch, a hinged component and a conductive component, or an analog switch composed of semiconductors such as a diode, a triode, a transistor and a field effect transistor. The auxiliary switch 310 can be connected to the grounding knife switch 200 through a mechanical connecting rod mechanism, or can be connected through a transmission mechanism such as a cylinder push rod and a hydraulic push rod with a sensor, a trigger, a solenoid valve, a relay and a switch. A person skilled in the art can make various changes without departing from the purpose of the present invention.

[0068] The high-voltage switch cabinet grounding system according to the second aspect of the present invention is described in detail below with reference to the accompanying drawings.

[0069] Reference Figure 8One embodiment of the present invention provides a high-voltage switch cabinet grounding system, including a power monitoring module 500 and the high-voltage switch cabinet of the first embodiment. In this embodiment, the power monitoring module is a SCADA (Supervisory Control And Data Acquisition) module, and the power monitoring module 500 is connected to the linkage module 300 by signal. The linkage module 300 includes an auxiliary switch 310 and a relay protection device 320. The auxiliary switch 310 is transmission-connected to the grounding knife switch 200 through a connecting rod mechanism, and the relay protection device 320 is electrically connected to the auxiliary switch 310. The relay protection device and the auxiliary switch 310 jointly control the on and off of the circuit breaker 100. The relay protection device 320 is provided with a communication interface 324, and the power monitoring module 500 is connected to the communication interface 324 by signal. The relay protection device 320 detects the on and off of the auxiliary switch 310, and the relay protection device 320 outputs the grounding state of the grounding knife switch 200 to the power monitoring module 500 through the communication interface 324. The power monitoring module 500 sends an on and off control signal for controlling the on and off of the circuit breaker 100 to the relay protection device 320 through the communication interface 324, thereby realizing remote monitoring. Through the power monitoring module 500, the grounding state of the grounding knife switch 200 can be observed intuitively and in real time, preventing the grounding knife switch 200 and the circuit breaker 100 from being in the on state at the same time, avoiding the occurrence of short circuit and leakage, and reducing the safety hazards of the switching operation while improving the operating efficiency, thereby improving the safety of the high-voltage switch cabinet. In addition, the auxiliary switch 310 and the relay protection device 320 jointly control the on and off of the circuit breaker 100: when the grounding switch 200 is in the on state, the auxiliary switch 310 maintains the circuit breaker 100 in the off state, and the on and off control signal sent by the power monitoring module 500 cannot change the on and off state of the circuit breaker 100, thereby avoiding the grounding switch 200 and the circuit breaker 100 being in the on state at the same time due to misoperation of the power monitoring module 500, preventing the occurrence of short circuit and leakage, further reducing the safety hazards of switching operations, and improving the safety of high-voltage switchgear.

[0070] Since the high-voltage switchgear grounding system of the embodiment of the present invention includes the high-voltage switchgear as in any of the above-mentioned embodiments, the high-voltage switchgear grounding system of the embodiment of the present invention has the technical effects brought by the high-voltage switchgear as in any of the above-mentioned embodiments. Therefore, the specific technical effects of the high-voltage switchgear grounding system of the embodiment of the present invention can refer to the technical effects of the high-voltage switchgear of any of the above-mentioned embodiments, which will not be repeated here.

[0071] The high-voltage switch cabinet grounding method according to the third aspect of the present invention is described in detail below with reference to the accompanying drawings.

[0072] Reference Figure 8 , Figure 9 andFigure 10 , an embodiment of the present invention provides a grounding method for a high-voltage switchgear, which is applied to the grounding system of the high-voltage switchgear. The grounding system of the high-voltage switchgear includes a circuit breaker 100, a grounding switch 200, a linkage module 300, an indicator light 400, and a power monitoring module 500. The circuit breaker 100 is used to connect the upper-level line and the lower-level line. The grounding switch 200 is electrically connected to the lower-level line. The linkage module 300 is linked with the grounding switch 200 and the circuit breaker 100. The indicator light 400 is electrically connected to the linkage module 300. The power monitoring module 500 is signal-connected to the linkage module 300. The grounding method for the high-voltage switchgear includes but is not limited to the following steps:

[0073] S100, the linkage module 300 responds to the grounding state of the grounding switch 200, outputs a grounding signal, and controls the indicator light 400 to turn on and off;

[0074] S200, the power monitoring module 500 responds to the grounding signal and displays the grounding state and the control interface of the circuit breaker 100;

[0075] S300, the power monitoring module 500 responds to the grounding signal and the first control signal and outputs a second control signal;

[0076] S400, the linkage module 300 responds to the second control signal and the grounding state and controls the circuit breaker 100 to conduct and break.

[0077] Through the grounding method of the high-voltage switch cabinet of the present invention, the linkage module 300 can control the lighting and extinguishing of the indicator light 400 according to the grounding state of the grounding knife switch 200, so as to significantly warn the operating personnel of the grounding state of the grounding knife switch 200 and improve the operating efficiency of the operating personnel. The linkage module 300 outputs a grounding signal containing grounding state information to the power monitoring module 500, and the power monitoring module 500 displays the grounding state of the grounding knife switch 200 on the control interface, enabling the operating personnel to intuitively and real-time observe the grounding state of the grounding knife switch 200, preventing the grounding knife switch 200 and the circuit breaker 100 from being in the conducting state at the same time, improving the operating efficiency of the operating personnel and avoiding the occurrence of short circuits and electric leakage. By inputting a first control signal to the power monitoring module 500 through the control interface of the power monitoring module 500, the power monitoring module 500 outputs a second control signal to the linkage module 300 according to the grounding signal output by the linkage module 300. The linkage module 300 responds to the second control signal and controls the on-off of the circuit breaker 100, thereby achieving the purpose of remote control. The second control signal output by the power monitoring module 500 to the linkage module 300 depends on the first control signal and the grounding signal, that is, on the on-off control instruction of the circuit breaker 100 and the grounding state of the grounding knife switch 200: when the grounding knife switch 200 is in the conducting state, the second control signal sent by the power monitoring module 500 keeps the circuit breaker in the open state to prevent the grounding knife switch 200 and the circuit breaker 100 from being in the conducting state at the same time; when the grounding knife switch 200 is in the open state, the second control signal sent by the power monitoring module 500 enables the linkage module 300 to control the on-off of the circuit breaker 100 according to the second control signal. The power monitoring module 500 avoids the occurrence of short circuits and electric leakage by means of soft interlocking of the grounding knife switch 200 and the circuit breaker 100. The linkage module 300 controls the on-off of the circuit breaker 100 according to the grounding state of the grounding knife switch 200: when the grounding knife switch 200 is in the conducting state, the linkage module 300 keeps the circuit breaker 100 in the open state; when the grounding knife switch 200 is in the open state, the linkage module 300 controls the conduction and interruption of the circuit breaker 100 according to the second control signal. The linkage module 300 realizes the electrical interlock between the grounding knife switch 200 and the circuit breaker 100, prevents the grounding knife switch 200 and the circuit breaker 100 from being in the conducting state at the same time, and avoids the occurrence of short circuits and electric leakage. Thus, it can be seen that the grounding method of the high-voltage switch cabinet of the present invention can improve the safety of the high-voltage switch cabinet and reduce the potential safety hazards of switching operations.

[0078] Refer to Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 11, Another embodiment of the present invention provides a method for grounding a high-voltage switch cabinet. On the basis of the above embodiment, the linkage module 300 includes an auxiliary switch 310 and a relay protection device 320. The auxiliary switch is provided with a first normally open contact 311, a second normally open contact 312, and a normally closed contact 313. The first normally open contact 311, the second normally open contact 312, and the normally closed contact 313 are linked with the grounding knife switch 200. The relay protection device 320 is provided with a switch quantity input unit 321, a first switch quantity output unit 322, a second switch quantity output unit 323, and a communication interface 324. The circuit breaker 100 is provided with a closing coil 110. The first normally open contact 311 is connected in series with the indicator light 400. The second normally open contact 312 is connected in series with the switch quantity input unit 321. The first switch quantity output unit 322, the normally closed contact 313, and the closing coil 110 are connected in series. The communication interface 324 is signal-connected to the power monitoring module 500. Figure 11 The method shown is Figure 10 The specific process of step S100 in, and the method includes but is not limited to the following steps:

[0079] S110, the grounding knife switch 200 is turned on, the second normally open contact 312 is closed and triggers the switch quantity input unit 321. The second switch quantity output unit 323 outputs a conduction state signal. The communication interface 324 sends a ground wire conduction signal. The first normally open contact 311 is closed, and the indicator light 400 lights up;

[0080] S120, the grounding knife switch 200 is opened, the second normally open contact 312 is opened and triggers the switch quantity input unit 321. The second switch quantity output unit 323 outputs an open state signal. The communication interface 324 sends a ground wire open signal. The first normally open contact 311 is opened, and the indicator light 400 goes out.

[0081] Specifically, the first normally open contact 311 and the indicator light 400 are connected in series between the positive and negative poles of the control power supply small busbar. When the grounding knife switch 200 is in the conduction state, the first normally open contact 311 is closed, and the indicator light 400 lights up. When the grounding knife switch 200 is in the open state, the first normally open contact 311 is opened, and the indicator light 400 goes out. Through this method, the grounding state of the grounding knife switch 200 can be clearly warned to the operators, the operation efficiency of the operators can be improved, and the safety of the grounding system of the high-voltage switch cabinet can be improved.

[0082] The second normally open contact 312 and the digital input unit 321 are connected in series between the positive and negative poles of the control power supply busbar. When the earthing switch 200 is in the conducting state, the second normally open contact 312 closes, and the voltage of the control power supply busbar is input to the digital input unit 321; when the earthing switch 200 is in the open state, the second normally open contact 312 opens, the circuit between the control power supply busbar and the digital input unit 321 is interrupted, and the input voltage of the digital input unit 321 changes from high level to low level. The change in the state of the earthing switch 200 causes the input voltage of the digital input unit 321 to change, and the relay protection device 320 obtains the earthing state of the earthing switch 200 by detecting the change in the input voltage of the digital input unit 321.

[0083] The relay protection device 320 outputs a conducting state signal and an open state signal reflecting the earthing state of the earthing switch 200 through the second digital output unit 323: when the earthing switch 200 is conducting, the second digital output unit 323 conducts; when the earthing switch 200 is open, the second digital output unit 323 is open. The second digital output unit 323 reflects the on-off state of the earthing switch 200, and the relay protection device 320 is interlocked with other devices or apparatuses through the second digital output unit 323, so that the earthing system of the high-voltage switchgear applying the present invention has good expandability and provides a standby interface for improving the safety of the earthing system of the high-voltage switchgear.

[0084] The relay protection device 320 outputs the earthing state of the earthing switch 200 to the power monitoring module 500 through the communication interface 324. When the earthing switch 200 is conducting, the relay protection device 320 sends a ground wire conducting signal indicating that the earthing switch 200 is conducting to the power monitoring module 500; when the earthing switch 200 is open, the relay protection device 320 sends a ground wire open signal indicating that the earthing switch 200 is open to the power monitoring module 500. The relay protection device 320 communicates with the power monitoring module 500 through the communication interface 324 to achieve remote monitoring, improve the safety of the high-voltage switchgear and reduce the potential safety hazards of switching operations.

[0085] Refer to Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 12 and Figure 13 , based on the above embodiment, the high-voltage switchgear earthing method provided by another embodiment of the present invention Figure 12 The method shown is Figure 10 The specific process of step S300 in

[0086] S310. When the grounding signal is a ground wire conduction signal and the first control signal is a first open circuit command signal, the power monitoring module 500 sends a maintenance command signal to the communication interface 324.

[0087] S320. When the grounding signal is a ground wire conduction signal and the first control signal is a first conduction command signal, the power monitoring module 500 sends a maintenance command signal to the communication interface 324.

[0088] S330. When the grounding signal is a ground wire open circuit signal and the first control signal is a first open circuit command signal, the power monitoring module 500 sends a second open circuit command signal to the communication interface 324.

[0089] S340. When the grounding signal is a ground wire open circuit signal and the first control signal is a first conduction command signal, the power monitoring module 500 sends a second conduction command signal to the communication interface 324.

[0090] Specifically, the power monitoring module 500 obtains the first control signal from the input device. The first control signal can be input by input devices such as a touch screen, a button, a keyboard, a scanner, a voice recognition device, and a gesture recognition device. The first control signal includes a first open circuit command signal and a first conduction command signal. The first open circuit command signal is used to control the power monitoring module 500 to send a command signal to make the circuit breaker 100 conduct to the communication interface 324. The first conduction command signal is used to control the power monitoring module 500 to send a command signal to make the circuit breaker 100 open to the communication interface 324. The power monitoring module 500 obtains the grounding signal from the communication interface 314. When the grounding signal is a ground wire conduction signal, that is, when the grounding switch 200 is conducting, regardless of whether the first control signal obtained by the power monitoring module 500 from the input device is a first conduction command signal or a first open circuit command signal, the power monitoring module 500 sends a maintenance command signal to the communication interface 324. The maintenance command signal is used to open the first digital output unit 322, so that the closing coil 110 is in a de-energized state, and the circuit breaker 100 maintains an open state or changes to an open state, thereby preventing the grounding switch 200 and the circuit breaker 100 from conducting simultaneously and realizing the soft interlock between the circuit breaker 100 and the grounding switch 200. When the grounding signal is a ground wire open circuit signal, that is, when the grounding switch 200 is open, if the first control signal is a first open circuit command signal, the power monitoring module 500 sends a second open circuit command signal for opening the first digital output unit 322 to the communication interface 324. If the first control signal is a first conduction command signal, the power monitoring module 500 sends a second conduction command signal for conducting the first digital output unit 322 to the communication interface 324, thereby realizing remote control, improving the safety of the high-voltage switchgear, and reducing the potential safety hazards of switching operations.

[0091] Figure 13The method shown is Figure 10 the specific process of step S400 in

[0092] S410, when the grounding switch 200 is conducting and the second control signal is a maintenance command signal, the normally closed contact 313 opens, the first switch output unit 322 is open-circuited, the closing coil 110 loses power, and the circuit breaker 100 is open-circuited;

[0093] S420, when the grounding switch 200 is open-circuited and the second control signal is a second open-circuit command signal, the normally closed contact 313 closes, the first switch output unit 322 is open-circuited, the closing coil 110 loses power, and the circuit breaker 100 is open-circuited;

[0094] S430, when the grounding switch 200 is open-circuited and the second control signal is a second conduction command signal, the normally closed contact 313 closes, the first switch output unit 322 is conducting, the closing coil 110 is powered on, and the circuit breaker 100 is conducting.

[0095] Specifically, the normally-closed contact 313 is interlocked with the earthing switch 200: when the earthing switch 200 is in the conducting state, the normally-closed contact 313 opens; when the earthing switch 200 is in the open state, the normally-closed contact 313 closes. The first digital output unit 322, the normally-closed contact 313, and the closing coil 110 are connected in series between the positive and negative poles of the control power supply busbar. When the earthing switch 200 is in the conducting state, the normally-closed contact 313 opens. At this time, regardless of whether the first digital output unit 322 is in the conducting state or the open state, the closing coil 110 is de-energized, and the circuit breaker 100 is open; when the earthing switch 200 is in the open state, the normally-closed contact 313 closes. If the second control signal received by the relay protection device 320 through the communication interface 324 is the second open command signal, the first digital output unit 322 is open, the closing coil 110 is de-energized, and the circuit breaker 100 is open. If the second control signal received by the relay protection device 320 through the communication interface 324 is the second conducting command signal, the first digital output unit 322 conducts, the closing coil 110 is energized, and the circuit breaker 100 conducts. In this embodiment, the closing coil 110 of the circuit breaker 100 and the normally-closed contact 313 of the auxiliary switch 310 are connected in series to form an interlock circuit between the earthing switch 200 and the circuit breaker 100: when the earthing switch 200 conducts, the circuit breaker 100 cannot be made to conduct either through the local switch of the circuit breaker 100 or through the power monitoring module 500, preventing the circuit breaker 100 and the earthing switch 200 from conducting simultaneously and avoiding the occurrence of short circuits and electric leakage. The first digital output unit 322 of the relay protection device 320 is connected in series with the closing coil 110 of the circuit breaker 100. On the premise that the normally-closed contact 313 closes, that is, the earthing switch 200 is open, the power monitoring module 500 can control the conduction and opening of the circuit breaker 100 by changing the conduction and opening states of the first digital output unit 322, thereby realizing remote control, improving the safety of the high-voltage switchgear, and reducing the potential safety hazards of switching operations.

[0096] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the technical field, various changes can be made without departing from the gist of the present invention.

Claims

1. A high voltage switch cabinet, It is characterized in that include: A circuit breaker is used to connect the upper circuit and the lower circuit and is provided with a closing coil; A grounding switch, electrically connected to the lower level circuit, and the grounding switch is used to ground the lower level circuit; A linkage module, which is linked with the grounding switch and the circuit breaker, and is used to output the grounding state of the grounding switch and receive an on-off control signal for controlling the on-off of the circuit breaker; An indicator light, electrically connected to the linkage module, for indicating the grounding state; Wherein, the linkage module includes an auxiliary switch and a relay protection device, the auxiliary switch is drivingly connected to the grounding knife switch, the auxiliary switch is electrically connected to the relay protection device and the indicator light, the relay protection device is electrically connected to the circuit breaker through the auxiliary switch, and the relay protection device is used to output the grounding state and receive the on-off control signal; The auxiliary switch is provided with a first normally open contact, a second normally open contact and a normally closed contact, and the normally closed contact is linked with the earthing switch. The relay protection device is provided with a switch quantity input unit and a first switch quantity output unit, and the first normally open contact and the second normally open contact are linked with the earthing switch. The first normally open contact is connected in series with the indicator light, the second normally open contact is connected in series with the switch quantity input unit, and the first switch quantity output unit, the normally closed contact and the closing coil are connected in series.

2. The high voltage switchgear according to claim 1, It is characterized in that The relay protection device is provided with a second switch value output unit, and the second switch value output unit is used to output the grounding state.

3. The high voltage switch cabinet according to claim 1, It is characterized in that The relay protection device is provided with a communication interface, and the communication interface is used to send the grounding state and receive the on-off control signal.

4. A high voltage switch cabinet grounding system, It is characterized in that include: The high voltage switchgear as claimed in any one of claims 1 to 3; A power monitoring module is signal-connected to the linkage module, and the power monitoring module is used to receive and display the grounding state and to send the on-off control signal.

5. A method for grounding a high voltage switch cabinet. It is characterized in that Applied to the grounding system of a high-voltage switchgear cabinet, the grounding system of the high-voltage switchgear cabinet includes a circuit breaker, an earthing switch, a linkage module, an indicator light, and a power monitoring module. The circuit breaker is used to connect the upper-level line and the lower-level line. The earthing switch is electrically connected to the lower-level line. The linkage module is linked with the earthing switch and the circuit breaker. The indicator light is electrically connected to the linkage module. The power monitoring module is signal-connected to the linkage module. The linkage module includes an auxiliary switch and a relay protection device. The auxiliary switch is provided with a first normally open contact, a second normally open contact, and a normally closed contact. The first normally open contact, the second normally open contact, and the normally closed contact are linked with the earthing switch. The relay protection device is provided with a digital input unit, a first digital output unit, a second digital output unit, and a communication interface. The circuit breaker is provided with a closing coil. The first normally open contact is in series with the indicator light. The second normally open contact is in series with the digital input unit. The first digital output unit, the normally closed contact, and the closing coil are in series. The communication interface is signal-connected to the power monitoring module; The method for grounding the high-voltage switchgear cabinet includes: The linkage module responds to the grounding state of the earthing switch, outputs a grounding signal, and controls the indicator light to turn on and off; The power monitoring module responds to the grounding signal and displays the grounding state and the control interface of the circuit breaker; The power monitoring module responds to the grounding signal and a first control signal, and outputs a second control signal; The linkage module responds to the second control signal and the grounding state, and controls the circuit breaker to conduct and break; Among them, the linkage module responds to the grounding state of the earthing switch, outputs a grounding signal, and controls the indicator light to turn on and off, including at least one of the following: When the earthing switch conducts, the second normally open contact closes and triggers the digital input unit. The second digital output unit outputs a conduction state signal. The communication interface sends a signal indicating that the ground wire is conducting. The first normally open contact closes, and the indicator light turns on; When the earthing switch breaks, the second normally open contact opens and triggers the digital input unit. The second digital output unit outputs a breaking state signal. The communication interface sends a signal indicating that the ground wire is broken. The first normally open contact opens, and the indicator light turns off.

6. According to the method for grounding the high-voltage switchgear cabinet as claimed in claim 5, characterized in that The power monitoring module responds to the grounding signal and a first control signal, and outputs a second control signal, including at least one of the following: When the grounding signal is the signal indicating that the ground wire is conducting and the first control signal is a first breaking instruction signal, the power monitoring module sends a maintenance instruction signal to the communication interface; When the grounding signal is the signal indicating that the ground wire is conducting and the first control signal is a first conduction instruction signal, the power monitoring module sends the maintenance instruction signal to the communication interface; When the grounding signal is the ground wire open - circuit signal and the first control signal is the first open - circuit command signal, the power monitoring module sends a second open - circuit command signal to the communication interface; When the grounding signal is the ground wire open - circuit signal and the first control signal is the first conduction command signal, the power monitoring module sends a second conduction command signal to the communication interface; The linkage module controls the conduction and opening of the circuit breaker in response to the second control signal and the grounding state, including at least one of the following: When the grounding switch is conducting and the second control signal is the maintenance command signal, the normally - closed contact opens, the first switch - quantity output unit is open - circuited, the closing coil loses power, and the circuit breaker is open - circuited; When the grounding switch is open - circuited and the second control signal is the second open - circuit command signal, the normally - closed contact closes, the first switch - quantity output unit is open - circuited, the closing coil loses power, and the circuit breaker is open - circuited; When the grounding switch is open - circuited and the second control signal is the second conduction command signal, the normally - closed contact closes, the first switch - quantity output unit is conducting, the closing coil is energized, and the circuit breaker is conducting.

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