High-voltage power supply grounding fault processing system
By introducing zero-sequence voltage transformers and fault clearing modules into high-voltage power supply systems, combined with line selection devices and relay protection devices, ground faults can be automatically identified and cleared, solving the problems of slow fault handling speed and poor safety in traditional methods, and achieving fast and safe fault handling.
Patent Information
- Application Number
- CN202422641292.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-10-31
AI Technical Summary
In existing high-voltage power supply systems, traditional fault handling methods are slow when a single-phase ground fault occurs, affecting power supply reliability and posing safety hazards. It is also difficult to quickly and accurately locate and disconnect the faulty line.
By employing zero-sequence voltage transformers, fault clearing modules, and line selection devices, grounding faults in high-voltage power supply systems are automatically identified and cleared. The faulty lines are quickly located and cleared by zero-sequence current transformers and low-current line selection tripping plates. Combined with relay protection devices to drive circuit breakers to trip, automated and rapid clearing is achieved.
It enables rapid fault handling in high-voltage power supply systems during grounding faults, preventing fault escalation, ensuring safe system operation, and improving power supply reliability and operational safety.
Smart Images
Figure CN223599488U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to high -voltage power supply technical field especially relates to a high -voltage power supply grounding fault processing system. BACKGROUND
[0002] In recent years along with the increase of industrial production electric equipment, the voltage of the power supply system of industrial production factory area also increases along with it. The voltage of the power supply system of existing industrial production factory area is usually 6kV-10kV.
[0003] The power grid capacity of high -voltage power supply system is big, but also has big grounding current simultaneously. For the high -voltage power supply system of single -phase grounding, when single -phase grounding fault, since not generating short -circuit current, line voltage is still symmetrical, does not affect normal power supply, and according to relevant regulations, the system continues to run 1-2 hours. But at this time, the voltage of non -fault phase to ground is raised to line voltage, easy to produce system resonance, long -time fault operation is easy to produce arc light grounding, forms two -point grounding fault, causes system overvoltage, and produces the damage effect to the insulation of power grid equipment, reaches certain degree and will cause PT explosion or insulator flashover etc.
[0004] In order to avoid single -phase grounding fault to cause system overvoltage problem, the traditional mode is to adopt the method of pulling line to cut off the fault line, and the method of pulling line is to use the ground signal of the alternating current insulation monitoring device of transformer substation, then by the duty personnel according to the load nature adopts the mode of sequentially pulling the brake to find the fault line, and after the load is transferred, the fault line is cut off. Although the method of pulling line can guarantee correctness, but the speed is slow and is extremely unfavorable to power supply reliability, especially for important load of factory area, directly pulling the road not only influences production but also causes great threat to personal safety, and the processing speed of fault is slow, and it is easy to lead to accident expansion, and influences the safe and stable operation of system. The method of cutting off the fault line by adopting the line selection device can quickly and accurately locate the fault point after the line grounding fault occurs, and then the fault is manually cut off and handled, and compared with the traditional method of pulling line, the efficiency is greatly improved, but since from the fault occurrence, to the transmission to the monitoring background, to the maintenance personnel cutting off the fault, it still needs a certain time, and in this period, the fault still exists, and at any time, it can lead to fault expansion, and still influences the safe operation of power supply system. SUMMARY
[0005] Therefore, it is necessary to provide a high -voltage power supply grounding fault processing system for the above technical problems, which can automatically identify and cut off the grounding fault of high -voltage power supply system, improve the fault processing speed, and ensure the safe operation of high -voltage power supply system.
[0006] The utility model provides a kind of high voltage power supply grounding fault processing system, including the zero sequence voltage mutual inductor being arranged in the high voltage power supply cabinet bus PT cabinet, a plurality of individually controllable one high voltage power supply cabinet output sub-line cut-off fault removal module and the line selection device for selecting the fault line in a plurality of high voltage power supply cabinet output sub-line;
[0007] The zero sequence voltage mutual inductor is electrically connected with the line selection device.
[0008] The positive pole of the start-stop control circuit of each fault removal module is electrically connected with a dry contact of one channel of the line selection device.
[0009] Each fault removal module comprises:
[0010] The zero sequence current mutual inductor is sleeved on the outside of the high voltage power supply cabinet output sub-line controlled by the fault removal module, and the zero sequence current mutual inductor is electrically connected with the line selection device.
[0011] The small current line selection tripping pressure plate is electrically connected with another dry contact of the channel in which the dry contact connected with the positive pole of the start-stop control circuit of the fault removal module where the small current line selection tripping pressure plate is located.
[0012] The relay protection device has two groups of relay interfaces, the output end and the input end of the first group of relay interfaces are respectively connected with the positive pole and the negative pole of the start-stop control circuit of the fault removal module, and the output end of the small current line selection tripping pressure plate is electrically connected with the input end of the second group of relay interfaces.
[0013] The circuit breaker is connected in series with the high voltage power supply cabinet output sub-line controlled by the circuit breaker, the input end of the tripping coil channel of the circuit breaker is electrically connected with the output end of the second group of relay interfaces, and the output end of the tripping coil channel of the relay is electrically connected with the negative pole of the start-stop control circuit of the fault removal module.
[0014] In one embodiment, the fault removal module is further provided with a loop protection device and a loop protection tripping pressure plate, the input end of the loop protection device is electrically connected with the positive pole of the start-stop control circuit of the fault removal module, the input end of the loop protection tripping pressure plate is electrically connected with the output end of the loop protection device, and the output end of the loop protection tripping pressure plate is electrically connected with the input end of the second group of relay interfaces.
[0015] In one embodiment, the fault removal module is further provided with a first indicator lamp and a second indicator lamp with different light colors, the circuit breaker is internally provided with a first switch channel that is synchronously opened and closed with the tripping coil channel switch, and a second switch channel that is asynchronously opened and closed with the tripping coil channel switch.
[0016] One end of the first indicator light is electrically connected to the input terminal of the first switch channel, one end of the second indicator light is electrically connected to the input terminal of the second switch channel, the output terminals of both the first and second switch channels are electrically connected to the negative terminal of the fault clearing module start-stop control circuit, and the other ends of the first and second indicator lights are electrically connected to the positive terminal of the fault clearing module start-stop control circuit.
[0017] The beneficial effects of this utility model are as follows: In this high-voltage power supply grounding fault handling system, each output sub-line of the high-voltage power supply cabinet is controlled by a fault clearing module. The zero-sequence current transformers of all fault clearing modules are connected to a line selection device. When one output sub-line of the high-voltage power supply cabinet experiences a grounding short circuit, the line selection device can determine the grounded sub-line based on the received zero-sequence voltage and multiple zero-sequence currents. Then, through an internally configured controller, it controls the trip relay corresponding to the current sub-line to transmit a small-current fault action signal to the small-current line selection trip plate of the corresponding fault clearing module. The small current passes through the small-current line selection trip plate and is connected to the relay protection device. The relay protection device then drives the circuit breaker trip coil on the current high-voltage power supply cabinet output sub-line to become energized, tripping the circuit breaker and automatically disconnecting the high-voltage power supply cabinet output sub-line. This high-voltage power supply grounding fault handling system can automatically and quickly screen and disconnect the grounded faulty line when a line grounding fault occurs, preventing the fault from escalating and effectively ensuring the safe operation of the high-voltage power supply system. Attached Figure Description
[0018] Figure 1 A schematic diagram of the circuit structure of the high-voltage power supply grounding fault handling system provided in this embodiment of the utility model.
[0019] Explanation of reference numerals in the attached drawings: 100, zero-sequence current transformer; 101, circuit protection device; 102, circuit protection trip plate; 103, low-current line selection trip plate; 104, relay protection device; 105, circuit breaker; 106, first indicator light; 107, second indicator light; 200, zero-sequence voltage transformer; 300, line selection device. Detailed Implementation
[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0021] In one embodiment, such as Figure 1 As shown, Figure 1It is the circuit structure schematic view of the high-voltage power supply grounding fault processing system, the high-voltage power supply grounding fault processing system of the embodiment comprises zero sequence voltage transformer 200 arranged in the high-voltage power supply cabinet bus PT cabinet, a plurality of fault removal modules capable of individually controlling one high-voltage power supply cabinet output sub-line removal and line selection device 300 for selecting the fault line in the plurality of high-voltage power supply cabinet output sub-lines;Zero sequence voltage transformer 200 is electrically connected with line selection device 300.
[0022] It should be noted that the zero sequence voltage transformer 200 arranged in the high-voltage power supply cabinet bus PT cabinet can collect the zero sequence signal of the high-voltage power supply cabinet bus.When the high-voltage power supply cabinet has an output sub-line grounding, the zero sequence voltage of its bus will also change.The high-voltage power supply cabinet has a bus and a plurality of output sub-lines.
[0023] Specifically, the line selection device 300 in the embodiment can be, but is not limited to, Xirui XRA-800 series line selection device 300.
[0024] The positive pole of the start-stop control loop of each fault removal module is electrically connected with one dry contact of one channel of the line selection device 300.
[0025] Each fault removal module comprises:
[0026] Zero sequence current transformer 100, zero sequence current transformer 100 is sleeved on the outside of the high-voltage power supply cabinet output sub-line controlled by the fault removal module, and the zero sequence current transformer 100 is electrically connected with the line selection device 300.
[0027] Small current line selection tripping pressure plate 103, the input end of small current line selection tripping pressure plate 103 is electrically connected with the other dry contact of the channel of the dry contact connected with the positive pole of the start-stop control loop of the fault removal module where small current line selection tripping pressure plate 103 is located in line selection device 300.
[0028] In the embodiment, small current line selection tripping pressure plate 103 keeps communication, which can be considered as opening or closing.
[0029] Relay protection device 104 with two groups of relay interfaces, the output end and the input end of the first group of relay interfaces are connected with the positive pole and the negative pole of the start-stop control loop of the fault removal module respectively, and the output end of the small current line selection tripping pressure plate 103 is electrically connected with the input end of the second group of relay interfaces.
[0030] Circuit breaker 105, circuit breaker 105 is connected in series on the high-voltage power supply cabinet output sub-line corresponding to the control of circuit breaker 105, the input end of the trip coil channel of circuit breaker 105 is electrically connected with the output end of the second group of relay interfaces, and the output end of the trip coil channel of the relay is electrically connected with the negative pole of the start-stop control loop of the fault removal module.
[0031] In the embodiment, one fault removal module is arranged on each output sub-line. The plurality of fault removal modules are jointly connected with a line selection device 300. The line selection device 300 is internally provided with a control board and a plurality of trip relays. Each trip relay corresponds to one output sub-line. The control board can calculate the output sub-line of the ground fault according to the bus zero sequence voltage and the zero sequence current of each output sub-line. Then, the trip relay corresponding to the output sub-line of the ground fault is controlled to send a small current fault action signal to the corresponding small current line selection trip pressure plate 103 through the dry contact of the channel of the trip relay. Then, the small current signal is connected to the relay protection device 104 through the small current line selection trip pressure plate 103. Then, the relay protection device 104 drives the trip coil of the circuit breaker 105 on the output sub-line of the high-voltage power supply cabinet to be electrified, and the circuit breaker 105 is tripped, so as to realize the automatic cutting of the output sub-line of the high-voltage power supply cabinet.
[0032] In the embodiment, the high-voltage power supply ground fault processing system can quickly screen out the fault output sub-line and quickly remove the fault through the cooperation of the fault removal module and the line selection device 300, so as to avoid the expansion of the fault and effectively guarantee the safe operation of the high-voltage power supply system.
[0033] In one embodiment, the fault removal module is further provided with a loop protection device 101 and a loop protection trip pressure plate 102. The input end of the loop protection device 101 is electrically connected with the positive electrode of the start-stop control loop of the fault removal module. The input end of the loop protection trip pressure plate 102 is electrically connected with the output end of the loop protection device 101. The output end of the loop protection trip pressure plate 102 is electrically connected with the input end of the second group of relay interfaces.
[0034] The functions of the loop protection device 101 and the loop protection trip pressure plate 102 are as follows. When other faults occur in the current system circuit except the ground fault of the output sub-line cable of the high-voltage power supply cabinet, the loop protection device 101 is actuated. The loop protection action signal is connected to the relay protection device 104 through the loop protection trip pressure plate 102. The relay protection device 104 is electrified. The trip coil of the circuit breaker 105 is electrified. The circuit breaker 105 is tripped. The automatic cutting of the output sub-line of the high-voltage power supply is realized.
[0035] In addition, in the embodiment, the outlet ends of the positive and negative electrodes of the start-stop control loop of each fault removal module are further respectively provided with one general switch for controlling the connection and disconnection of each output sub-line to the high-voltage control cabinet.
[0036] In one embodiment, the fault removal module is further provided with a first indicator lamp 106 and a second indicator lamp 107 with different light colors. The circuit breaker 105 is internally provided with a first switch channel which is synchronously opened and closed with the trip coil channel switch, and a second switch channel which is asynchronously opened and closed with the trip coil channel switch.
[0037] One end of the first indicator lamp 106 is electrically connected with the input end of the first switch channel, one end of the second indicator lamp 107 is electrically connected with the input end of the second switch channel, the output ends of the first switch channel and the second switch channel are electrically connected with the negative pole of the fault removal module start-stop control loop, the other end of the first indicator lamp 106 and the other end of the second indicator lamp 107 are electrically connected with the positive pole of the fault removal module start-stop control loop.
[0038] When the relay protection device 104 is electrified to drive the circuit breaker 105 to trip the coil, the coil channel switch is closed, the first switch channel switch is closed, the second switch channel switch is opened, and the first indicator lamp 106 emits light; when the coil channel switch is opened, the first switch channel switch is opened, the second switch channel switch is closed, and the second indicator lamp 107 emits light. The first indicator lamp 106 and the second indicator lamp 107 are used to remind the operator.
[0039] The high-voltage power supply grounding fault processing system of the embodiment can automatically and quickly remove the grounding fault line when the line grounding fault occurs, avoid the expansion of the fault, and remind the operator, thereby facilitating the operator to maintain.
[0040] The above-described embodiments only express several embodiments of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the appended claims.
Claims
1. A high-voltage power supply grounding fault handling system, characterized in that, It includes a zero-sequence voltage transformer (200) installed in the PT cabinet of the high-voltage power supply cabinet bus, multiple fault clearing modules that can individually control the disconnection of the output sub-line of a high-voltage power supply cabinet, and a line selection device (300) for selecting the faulty line among the multiple output sub-lines of the high-voltage power supply cabinet. The zero-sequence voltage transformer (200) is electrically connected to the line selection device (300); The positive terminal of the start / stop control circuit of each fault clearing module is electrically connected to a dry contact of a channel of the line selection device (300). Each fault clearance module includes: Zero-sequence current transformer (100) is sleeved on the outside of the output sub-line of the high-voltage power supply cabinet controlled by the fault clearing module, and the zero-sequence current transformer (100) is electrically connected to the line selection device (300). The input terminal of the low current line selection trip plate (103) is electrically connected to another dry contact in the channel of the dry contact in the line selection device (300) that is connected to the positive terminal of the start-stop control circuit of the fault clearing module where the low current line selection trip plate (103) is located. The relay protection device (104) has two sets of relay interfaces. The output and input terminals of the first set of relay interfaces are respectively connected to the positive and negative poles of the start-stop control circuit of the fault clearing module. The output terminal of the small current line selection trip plate (103) is electrically connected to the input terminal of the second set of relay interfaces. Circuit breaker (105), the circuit breaker (105) is connected in series to the output sub-line of the high-voltage power supply cabinet corresponding to the circuit breaker (105), the input terminal of the trip coil channel of the circuit breaker (105) is electrically connected to the output terminal of the second set of relay interfaces, and the output terminal of the trip coil channel of the circuit breaker (105) is electrically connected to the negative terminal of the fault clearing module start-stop control circuit.
2. The high-voltage power supply grounding fault handling system according to claim 1, characterized in that, The fault clearing module is also provided with a circuit protection device (101) and a circuit protection trip plate (102). The input terminal of the circuit protection device (101) is electrically connected to the positive terminal of the start-stop control circuit of the fault clearing module. The input terminal of the circuit protection trip plate (102) is electrically connected to the output terminal of the circuit protection device (101). The output terminal of the circuit protection trip plate (102) is electrically connected to the input terminal of the second set of relay interfaces.
3. The high-voltage power supply grounding fault handling system according to claim 2, characterized in that, The fault clearing module is also provided with a first indicator light (106) and a second indicator light (107) with different light colors. The circuit breaker (105) is provided with a first switch channel that opens and closes synchronously with the trip coil channel switch of the circuit breaker (105), and a second switch channel that opens and closes asynchronously with the trip coil channel switch of the circuit breaker (105). One end of the first indicator light (106) is electrically connected to the input terminal of the first switch channel, and one end of the second indicator light (107) is electrically connected to the input terminal of the second switch channel. The output terminals of both the first and second switch channels are electrically connected to the negative terminal of the fault clearing module start-stop control circuit. The other end of the first indicator light (106) and the other end of the second indicator light (107) are electrically connected to the positive terminal of the fault clearing module start-stop control circuit.