High-voltage power distribution equipment power cut and transmission method and high-voltage power distribution system
By disconnecting circuit breakers and moving isolation trolleys in a specific sequence in high-voltage power distribution systems, the safety hazards in power outage and restoration operations of high-voltage power equipment are solved, safe operation is achieved in the absence of power, and the risk of equipment damage and economic loss is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-03-31
AI Technical Summary
There are safety hazards in the operation of power outages and restorations of existing high-voltage power equipment. Especially when the equipment is aging or the circuit breaker is unreliable, operators may suffer arc burns or equipment damage, and it may also cause large-scale power outages in the mine, resulting in economic losses.
A method for power outage and restoration of a high-voltage power distribution system is adopted. First, the circuit breakers of the lower-level high-voltage vacuum power distribution devices are disconnected one by one while keeping the isolation truck in the connected state. Then, the circuit breakers of the upper-level ground high-voltage power switch devices are disconnected. Next, the lower-level isolation trucks are moved to the isolation state one by one. Finally, the upper-level isolation trucks are moved to the isolation state to ensure that all operations are completed in a power-deprived state.
It effectively reduces the safety risks to operators, avoids arc burns and equipment damage, reduces the occurrence of large-scale power outages in mines, and improves the safety and reliability of power outage and restoration operations for high-voltage equipment.
Smart Images
Figure CN121769837A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of coal mine electromechanical engineering technology, and relates to a method for power outage and restoration of high-voltage power distribution equipment and a high-voltage power distribution system. Background Technology
[0002] Operating high-voltage electrical equipment in a high-voltage power environment in coal mines involves frequent and high-risk power outages and restorations. According to relevant regulations such as the "Coal Mine Safety Regulations," "Coal Mine Electrical Testing Regulations," "Detailed Rules for the Installation, Operation, Maintenance and Repair of Low-Voltage Leakage Detection and Protection Devices in Coal Mines," and "Detailed Rules for the Setting of Short-Circuit Protection Devices for Low-Voltage Power Grids in Coal Mines," high-voltage electrical equipment in coal mines must be regularly powered off and restored for inspection and maintenance. For example, the protection devices of underground high-voltage equipment should be inspected annually, and the setting values of the relay protection of the underground power distribution system should be checked every six months. When the equipment load changes, the settings should be adjusted in a timely manner to ensure that various protection devices operate sensitively and reliably.
[0003] Currently, the standard high-voltage power outage operation procedure in the industry is as follows: from the load side to the power supply side, each piece of equipment is operated in sequence by first disconnecting the circuit breaker, then opening the isolating handcart (or isolating switch), until finally shutting down the upstream main power supply unit. Among them, the main functions of the isolating handcart are as follows: (1) After opening the switch, a reliable insulation gap can be established to separate the equipment or line that needs to be repaired from the power supply with a clear disconnection point to ensure the safety of maintenance personnel and equipment; (2) It can switch the line according to the operation needs.
[0004] The existing high-voltage power outage operation method has inherent and significant safety hazards: when operating each isolating device, its power supply side (busbar side) remains energized. However, as the equipment ages, aging equipment, excessive circuit breaker opening and closing times, vacuum tube defects, and other hidden faults lead to ineffective tripping. Operators pull the isolating switch while the equipment is under load, and there is no protective barrier between the isolating switch and the operator. When the isolating switch is pulled under load, the arc is stretched and short-circuits to ground, causing arc burns to the operator. In severe cases, it can directly cause short-circuit discharge to the operator, severely damage the equipment, and cause large-scale power outages in the mine, resulting in huge economic losses and personal safety accidents. Summary of the Invention
[0005] The technical problem to be solved by this invention is how to reduce the safety risks of power outage and restoration operations of high-voltage power equipment in coal mines.
[0006] The present invention solves the above-mentioned technical problems through the following technical solutions: A method for shutting down a high-voltage power distribution system, the high-voltage power distribution system comprising an upper-level ground high-voltage power switchgear and at least one lower-level high-voltage vacuum power distribution device; The method includes the following steps: S11, disconnect all the circuit breakers of the lower-level high-voltage vacuum power distribution device one by one in a preset order, and keep the isolation handcart of the lower-level high-voltage vacuum power distribution device in the connected state; S12, disconnect the circuit breaker of the upper-level ground high-voltage power supply switch device; S13, move the isolation handcarts of all lower-level high-voltage vacuum power distribution devices from the connected state to the isolated state one by one in the preset sequence; S14, move the isolation handcart of the upper-level ground high-voltage power switch device from the connected state to the isolated state.
[0007] Furthermore, the step of sequentially disconnecting all the lower-level high-voltage vacuum power distribution devices in a preset order specifically refers to: The disconnection operation is performed starting from the lower-level high-voltage vacuum power distribution device that is furthest from the upper-level ground high-voltage power switch device along the high-voltage power distribution line, and then sequentially performing the disconnection operation on the lower-level high-voltage vacuum power distribution devices along the direction of the upper-level ground high-voltage power switch device.
[0008] Furthermore, the "connection state" specifically refers to the isolation handcart being closed, and the "isolation state" specifically refers to the isolation handcart being disconnected.
[0009] Furthermore, the rated voltage of the high-voltage power distribution system is 10kV or 110kV.
[0010] Furthermore, the lower-level high-voltage vacuum power distribution device is specifically a mine-use explosion-proof high-voltage vacuum power distribution device or a sulfur hexafluoride gas-insulated metal-enclosed switch device.
[0011] The present invention also provides a method for power transmission in a high-voltage power distribution system, wherein the high-voltage power distribution system includes an upper-level ground high-voltage power switch device and at least one lower-level high-voltage vacuum power distribution device; The method includes the following steps: S21, move the isolating handcart of the circuit breaker of the upper-level ground high-voltage power switchgear from the isolating state to the connected state; S22, move the isolation handcarts of all lower-level high-voltage vacuum power distribution devices from the isolation state to the connection state one by one in the preset sequence; S23, connect the circuit breaker of the upper-level ground high-voltage power supply switch device; S24, connect the circuit breakers of all the lower-level high-voltage vacuum power distribution devices one by one in a preset sequence.
[0012] Furthermore, the process of moving the isolation handcarts of all downstream high-voltage vacuum distribution units from the isolation state to the connection state one by one in a preset sequence is as follows: The connection operation is performed starting from the lower-level high-voltage vacuum power distribution device that is furthest from the upper-level ground high-voltage power switch device along the high-voltage power distribution line, and then sequentially connecting the lower-level high-voltage vacuum power distribution devices in the direction of the upper-level ground high-voltage power switch device.
[0013] The present invention also provides a high-voltage power distribution system, including an upper-level ground high-voltage power switch and at least one lower-level high-voltage vacuum power distribution device; the lower-level high-voltage vacuum power distribution device is electrically connected to the load side of the upper-level ground high-voltage power switch, and the high-voltage power distribution system is configured to perform the above-described power outage method.
[0014] The advantages of this invention are: This invention proposes a method for power outage and restoration operations of high-voltage power distribution equipment. Since there are no relevant industry standards or operating procedures to constrain power outage and restoration operations, this invention breaks with the conventional thinking of operators regarding power outage and restoration operations of high-voltage power equipment in underground coal mines. This method avoids the assumption that the circuit is reliably disconnected after the circuit breaker is tripped. Instead, it considers the unreliability of circuit breakers and, combined with actual production conditions, changes the original power outage and restoration operations. From an operational perspective, it overcomes the hidden safety risks associated with power outage and restoration operations. Without affecting safety or work efficiency, it eliminates the phenomenon of operators pulling the isolation handcart under load, improves the safety of power outage and restoration operations of underground high-voltage equipment, and reduces the occurrence of large-scale power outages and significant economic losses in mines. It has already been promoted and applied in Guqiao Coal Mine and is also applicable to other coal mines and high-voltage power systems such as substations. Attached Figure Description
[0015] Figure 1 This is a flowchart illustrating the high-voltage power distribution system power outage method according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of a 10KV high-voltage power distribution system power outage operation according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of a power outage operation of a 110KV high-voltage power distribution system according to Embodiment 1 of the present invention. Detailed Implementation
[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments: Example 1 like Figure 1 Specifically, a method for power outage of a high-voltage power distribution system is disclosed, wherein the high-voltage power distribution system includes an upper-level ground high-voltage power switchgear and at least one lower-level high-voltage vacuum power distribution device; the method includes the following steps: S11, disconnect all the circuit breakers of the lower-level high-voltage vacuum power distribution device one by one in a preset order, and keep the isolation handcart of the lower-level high-voltage vacuum power distribution device in the connected state; S12, disconnect the circuit breaker of the upper-level ground high-voltage power supply switch device; S13, move the isolation handcarts of all lower-level high-voltage vacuum power distribution devices from the connected state to the isolated state one by one in the preset sequence; S14, move the isolation handcart of the upper-level ground high-voltage power switch device from the connected state to the isolated state.
[0018] In a preferred embodiment, such as Figure 2 As shown, the power outage operation of a 10kV high-voltage power distribution system in a coal mine is illustrated as an example. The high-voltage power distribution system includes an upper-level ground high-voltage power switch device 02# and four lower-level high-voltage vacuum power distribution devices 21#, 22#, 23# and 24#. The rated voltage of the high-voltage power distribution system is 10kV. The upper-level and lower-level high-voltage vacuum power distribution devices can be, but are not limited to, PBG series mine explosion-proof permanent magnet high-voltage vacuum power distribution devices.
[0019] Traditional high-voltage power outage procedures in various industries involve: along Figure 2 The arrows indicate the preset order, and the following operations will be performed sequentially: For the lower-level high-voltage vacuum distribution unit 24#, disconnect the circuit breaker and disconnect (or pull out) the isolating handcart; for the lower-level high-voltage vacuum distribution unit 23#, disconnect the circuit breaker and disconnect the isolating handcart; for the lower-level high-voltage vacuum distribution unit 22#, disconnect the circuit breaker and disconnect the isolating handcart; for the lower-level high-voltage vacuum distribution unit 21#, disconnect the circuit breaker and disconnect the isolating handcart; finally, for the upper-level ground high-voltage power switch unit 02#, disconnect the circuit breaker and disconnect the isolating handcart. The high-voltage power outage operation is complete.
[0020] In this embodiment, with Figure 2 The arrows indicate the preset order, and the following operations will be performed sequentially: S11', disconnect the circuit breakers of the lower-level high-voltage vacuum power distribution devices 21#, 22#, 23# and 24# one by one in the preset sequence, and keep the isolation handcarts of the lower-level high-voltage vacuum power distribution devices 21#, 22#, 23# and 24# in the connected state; S12', disconnect the circuit breaker of the upper-level ground high-voltage power supply switch device 02#; S13', disconnect the isolation handcarts of the lower-level high-voltage vacuum power distribution devices 21#, 22#, 23# and 24# one by one in the preset sequence, and move them from the connected state to the isolated state; S14' disconnects the isolation trolley of the upper-level ground high-voltage power switch device 02#, moving it from the connected state to the isolated state. At this time, the entire high-voltage power distribution system is de-energized, and all operations are performed in a power-deprived state. This overcomes the hidden safety risks that exist during power outage operations from an operational perspective and improves the safety of power outage and restoration operations for underground high-voltage equipment.
[0021] In a preferred embodiment, such as Figure 3 As shown, the power outage operation of the 110kV substation in the central area of Huainan Guqiao Coal Mine is used as an example. The high-voltage power distribution system includes the upper-level Luji substation and the lower-level Guqiao Coal Mine substation. The rated voltage level of the upper-level Luji substation is 220kV, and the rated voltage level of the lower-level Guqiao Coal Mine substation is 110kV. Both the upper-level Luji substation and the lower-level Guqiao Coal Mine substation are equipped with sulfur hexafluoride gas-insulated metal-enclosed switchgear (GIS).
[0022] Traditional high-voltage power outage procedures in various industries involve: along Figure 3 The arrows indicate the preset order, and the following operations will be performed sequentially: Disconnect the 774 incoming line circuit breaker of the downstream Guqiao Coal Mine substation, and disconnect (or open) the load-side isolating handcart of the 774 incoming line bay of the downstream Guqiao Coal Mine substation (e.g., Figure 3 (As shown in the middle mark 7741), then disconnect the power supply side isolation handcart of the 774 incoming line bay of the downstream Guqiao Coal Mine substation (such as... Figure 3 (As shown in the middle mark 7743), finally contact the superior Luji substation to disconnect the 774 switch circuit breaker of the subordinate Guqiao coal mine substation.
[0023] In this embodiment, with Figure 3 The arrows indicate the preset order, and the following operations will be performed sequentially: "S11" disconnects the 774 incoming line interval circuit breaker of the lower-level Guqiao Coal Mine substation in the preset sequence, and keeps the load side and power supply side isolation handcart of the 774 incoming line interval of the lower-level Guqiao Coal Mine substation in the connected state. "S12" directly contacts the superior Luji substation to disconnect the 774 switch circuit breaker of the subordinate Guqiao coal mine substation; "S13" disconnects the load-side isolation handcart and power-side isolation handcart of the 774 incoming line bay of the lower-level Guqiao Coal Mine substation in a preset sequence, moving them from the connected state to the isolated state. At this time, the Guqiao Coal Mine substation completes the power outage operation, and all operations are carried out in a power-off state. This overcomes the hidden safety risks that exist during power outage operations from an operational perspective and improves the safety of power outage and restoration operations of underground high-voltage equipment.
[0024] The present invention also provides a method for power transmission in a high-voltage power distribution system, wherein the power transmission method is the reverse process of the power outage method, and specifically includes the following steps: S21, move the isolating handcart of the circuit breaker of the upper-level ground high-voltage power switchgear from the isolating state to the connected state; S22, move the isolation handcarts of all lower-level high-voltage vacuum power distribution devices from the isolation state to the connection state one by one in the preset sequence; S23, connect the circuit breaker of the upper-level ground high-voltage power supply switch device; S24, connect the circuit breakers of all the lower-level high-voltage vacuum power distribution devices one by one in a preset sequence.
[0025] The present invention also provides a high-voltage power distribution system, including an upper-level ground high-voltage power switch and at least one lower-level high-voltage vacuum power distribution device; the lower-level high-voltage vacuum power distribution device is electrically connected to the load side of the upper-level ground high-voltage power switch, and the high-voltage power distribution system is configured to perform the power outage method and power supply method described in Embodiment 1.
[0026] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A power outage method for a high voltage power distribution system, characterized by The high-voltage power distribution system comprises a high-voltage power supply switch device on the ground and at least one high-voltage vacuum power distribution device; The method comprises the following steps: S11, disconnecting the circuit breakers of all the high-voltage vacuum power distribution devices in a preset order, and keeping the isolation handcart of the high-voltage vacuum power distribution device in an on state; S12, disconnecting the circuit breakers of the high-voltage power supply switch device on the ground; S13, moving the isolation handcart of all the high-voltage vacuum power distribution devices from the on state to the isolation state in a preset order; S14, moving the isolation handcart of the high-voltage power supply switch device on the ground from the on state to the isolation state.
2. The power distribution system outage method of claim 1, wherein, The disconnecting of the circuit breakers of all the high-voltage vacuum power distribution devices in a preset order is specifically: Starting from the high-voltage vacuum power distribution device farthest from the high-voltage power supply switch device on the ground along the high-voltage power distribution line, and performing the disconnecting operation on the high-voltage vacuum power distribution devices in turn along the direction of the high-voltage power supply switch device on the ground.
3. The power distribution system outage method of claim 1, wherein, The on state is specifically that the isolation handcart is closed, and the isolation state is specifically that the isolation handcart is disconnected.
4. The power distribution system outage method of claim 1, wherein, The high-voltage vacuum power distribution device is specifically a mine explosion-proof high-voltage vacuum power distribution device, and the rated voltage of the high-voltage power distribution system is 10kV.
5. The method of claim 1, wherein, The high-voltage vacuum power distribution device is specifically a sulfur hexafluoride gas insulated metal enclosed switch device, and the rated voltage of the high-voltage power distribution system is 110kV.
6. A power transmission method for a high-voltage power distribution system, characterized by The high-voltage power distribution system comprises a high-voltage power supply switch device on the ground and at least one high-voltage vacuum power distribution device; The method comprises the following steps: S21, moving the isolation handcart of the circuit breakers of the high-voltage power supply switch device on the ground from the isolation state to the on state; S22, moving the isolation handcart of all the high-voltage vacuum power distribution devices from the isolation state to the on state in a preset order; S23, connecting the circuit breakers of the high-voltage power supply switch device on the ground; S24, connecting the circuit breakers of all the high-voltage vacuum power distribution devices in a preset order.
7. The method of claim 6, wherein the high voltage distribution system is a power distribution system. The moving of the isolation handcart of all the high-voltage vacuum power distribution devices from the isolation state to the on state in a preset order is specifically: Starting from the high-voltage vacuum power distribution device farthest from the high-voltage power supply switch device on the ground along the high-voltage power distribution line, and performing the connecting operation on the high-voltage vacuum power distribution devices in turn along the direction of the high-voltage power supply switch device on the ground.
8. A high voltage power distribution system, characterized by The high-voltage power distribution system comprises a high-voltage power supply switch device on the ground and at least one high-voltage vacuum power distribution device; the high-voltage vacuum power distribution device is electrically connected to the load side of the high-voltage power supply switch device on the ground, and the high-voltage power distribution system is configured to perform the power failure method of any one of claims 1-5.