Mobile single-phase earth fault simulation vehicle

Abstract

The invention relates to a mobile single-phase earth fault simulation vehicle, and the vehicle comprises an engineering vehicle carrier which comprises a cab, a part room, and a control room. A single-phase earth fault simulation device is arranged in the component chamber; the single-phase earth fault simulation device comprises an isolation switch, a current transformer, a voltage transformer, a comprehensive protection unit, a circuit breaker, an adjustable resistor and a controllable arc discharge device. A test host is arranged in the control chamber, and a central control unit is arranged on the test host and used for comprehensively controlling all adjustable parameter elements in the vehicle, controlling a circuit breaker to be switched on and switched off and recording data and outputting results. Various single-phase earth faults are integrated on the integrated fault detection vehicle, movement is more convenient, the device body does not need wiring, a large amount of test preparation time for field wiring is saved, the device is slightly influenced by weather, and tests can be continued even in certain rainy and snowy weather.

Description

Technical Field

[0001] The invention relates to the technical field of power system testing, in particular to a mobile single-phase grounding fault simulation vehicle. Background Art

[0002] In the construction and development of new power systems, the supply guarantee and regulation capabilities of distribution networks are particularly important. The National Energy Administration has put forward guiding opinions on the high-quality development of distribution networks under the new situation, emphasizing the improvement of power supply guarantee capabilities and the reduction of power outages. In the statistics of distribution network fault data, single-phase grounding faults account for more than 70%. If not handled promptly and effectively, the scope of the accident may be expanded, and even line equipment may be burned, causing serious economic losses and social impacts.

[0003] At present, the distribution network lines are equipped with single-phase ground fault protection functions at key locations such as primary and secondary fusion circuit breakers and substation outlet switches. However, the accuracy and reliability of the newly invested equipment still need to be verified by on-site testing. With the changes in the topology of the distribution network and the aging of equipment and lines, equipment malfunctions and refusal to operate are becoming more frequent, and the demand for on-site testing is becoming increasingly urgent. However, the existing single-phase ground fault simulation devices have many shortcomings, which are mainly manifested in the following aspects: Incomplete types of ground fault simulation: Traditional simulation devices cannot fully simulate various single-phase ground fault conditions, which limits the comprehensiveness and accuracy of fault simulation.

[0004] The device is complex and inconvenient to transport: The traditional single-phase grounding fault simulation device requires a truck to transport different simulation components to the test site, and then use a crane to place each module on the ground. This not only increases logistics costs, but also increases the complexity of on-site preparation work. The test requires the cooperation of multiple engineering vehicles, and the test site is large. Many rural distribution network lines are located in mountainous or forested areas, and traditional simulation devices are difficult to use here.

[0005] On-site wiring work is complicated: During the test, testers are required to perform complex wiring work. Traditional simulation devices require cumbersome loading and unloading processes, and testers are required to connect each module by themselves. The test preparation and cleanup time takes 1-2 hours, which seriously affects the test efficiency and puts higher skill requirements on testers.

[0006] Inconvenience in recording on-site data: On-site data recording mostly relies on paper records, which brings inconvenience to subsequent data analysis and processing.

[0007] High requirements for weather conditions: Open-air testing of the device has high requirements for weather conditions. Once bad weather occurs, the test cannot be continued, which limits the flexibility and timeliness of the test. Summary of the invention

[0008] Therefore, the technical problem to be solved by the present invention is to overcome the problems of complicated wiring, inconvenient transportation and high environmental requirements of the single-phase grounding fault simulation device in the prior art, and provide a mobile single-phase grounding fault simulation vehicle, which integrates various single-phase grounding faults on an integrated fault detection vehicle, making it more convenient to move, and the device body does not need to be wired, thus saving a lot of test preparation time for on-site wiring. In addition, the device is less affected by the climate, and the test can continue even in certain rainy and snowy weather. In order to solve the above technical problems, the present invention provides a mobile single-phase grounding fault simulation vehicle, comprising: an engineering vehicle carrier, the engineering vehicle carrier comprising a cab, a component room and a control room; a simulated single-phase grounding fault device is arranged in the component room; the simulated single-phase grounding fault device comprises an isolating switch, a current transformer, a voltage transformer, a comprehensive protection unit, a circuit breaker, an adjustable resistor and a controllable arc discharge device; Among them, the current transformer is used to measure the current of the loop; the voltage transformer is used to measure the voltage of the loop; the isolating switch is connected in series with the circuit breaker to control the opening and closing of the grounding loop; when it is necessary to test the grounding fault, the isolating switch can disconnect the circuit to ensure safety and control the test conditions; the circuit breaker automatically disconnects the circuit when an abnormal current (such as a short circuit or overload) is detected to protect the circuit and equipment; the integrated protection unit is used to monitor the circuit status and cut off the circuit in time when it is detected that the grounding current is greater than a certain value and may cause danger; the adjustable resistor is used to adjust the grounding resistance to simulate fault conditions under different grounding conditions; one end of the controllable arc discharge device is connected in series with the adjustable resistor to simulate the discharge characteristics during arc grounding.

[0009] The control room is provided with a test host, and the test host is provided with a central control unit for comprehensively controlling various adjustable parameter elements in the vehicle, controlling the opening and closing of the circuit breaker, and performing data recording and result output.

[0010] In one embodiment of the present invention, the integrated protection unit includes a signal acquisition unit and a single-phase grounding test protection control device, wherein the signal acquisition unit is responsible for collecting grid status data; the single-phase grounding test protection control device uses the data of the signal acquisition unit to simulate and protect single-phase grounding faults.

[0011] In one embodiment of the present invention, the controllable arc discharge is placed as an arc grounding simulator, and the arc grounding simulator is connected to a grounding body through an insulated wire.

[0012] In one embodiment of the present invention, it also includes a connecting piece connected to the tested line, and the connecting piece is connected to the isolating switch through an insulated conductor.

[0013] In one embodiment of the present invention, a fuse is provided between the insulated conductor and the isolating switch.

[0014] In one embodiment of the present invention, the circuit breaker includes a first circuit breaker and a second circuit breaker, the first circuit breaker is connected to the A-phase circuit, and the second circuit breaker is connected to the B-phase circuit.

[0015] In one embodiment of the present invention, a high voltage line terminal and a grounding terminal are provided on the engineering vehicle carrier.

[0016] In one embodiment of the present invention, a maintenance passage is provided on the rear side of the engineering vehicle carrier.

[0017] In one embodiment of the present invention, cameras are provided above and at the rear of the engineering vehicle carrier for safety monitoring by personnel in the central control room.

[0018] In one embodiment of the present invention, a charging port is provided on the side of the engineering vehicle carrier.

[0019] Compared with the prior art, the above technical solution of the present invention has the following beneficial effects The mobile single-phase grounding fault simulation vehicle described in the present invention integrates multiple single-phase grounding fault simulation functions on an integrated fault detection vehicle, has a small size, strong mobility, and strong terrain adaptability; the device does not require internal wiring, the use steps are simple, and the testing efficiency is high; when in use, only one tester and one line operation and maintenance personnel are required, and no external vehicles and personnel are required, which can save a lot of manpower costs; in addition, the device is simple to use, and the tester only needs a few hours of simple training to master it, and the personnel quality requirements are also relatively low; the present invention deploys the entire device inside the vehicle, and personnel control is also inside the vehicle, so the test can continue even in certain rainy and snowy weather, and the climate has little impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0021] Figure 1 It is a principle block diagram of the device for simulating single-phase grounding fault in the present invention; Figure 2 It is a structural diagram of the engineering vehicle carrier in the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Embodiment 1

[0023] Reference Figure 1 As shown, the mobile single-phase grounding fault simulation vehicle of the present invention comprises an engineering vehicle carrier, the engineering vehicle carrier comprises a cab, a component room and a control room; a simulated single-phase grounding fault device is arranged in the component room; the simulated single-phase grounding fault device comprises an isolating switch, a current transformer, a voltage transformer, an integrated protection unit, a circuit breaker, an adjustable resistor and a controllable arc discharge device; Among them, the current transformer is used to measure the current of the loop; the voltage transformer is used to measure the voltage of the loop; the isolating switch is connected in series with the circuit breaker to control the opening and closing of the grounding loop; the integrated protection unit is used to monitor the circuit status and cut off the circuit in time when it is detected that the grounding current is greater than a certain value and may cause danger; the adjustable resistor is used to adjust the grounding resistance to simulate the fault conditions under different grounding conditions; one end of the controllable arc discharge device is connected in series with the adjustable resistor to simulate the discharge characteristics during arc grounding.

[0024] The control room is provided with a test host, and the test host is provided with a central control unit for comprehensively controlling various adjustable parameter elements in the vehicle, controlling the opening and closing of the circuit breaker, and performing data recording and result output.

[0025] Furthermore, the integrated protection unit includes a signal acquisition unit and a single-phase grounding test protection control device, wherein the signal acquisition unit is responsible for collecting grid status data; the single-phase grounding test protection control device uses the data of the signal acquisition unit to simulate and protect single-phase grounding faults.

[0026] In this embodiment, the controllable arc discharge is placed as an arc grounding simulator, and the arc grounding simulator is connected to a grounding body through an insulated wire.

[0027] Furthermore, it also includes a connecting piece connected to the tested line, and the connecting piece is connected to the isolating switch through an insulated conductor.

[0028] In this embodiment, a fuse is provided between the insulated wire and the isolating switch.

[0029] In this embodiment, the circuit breaker includes a first circuit breaker and a second circuit breaker, wherein the first circuit breaker is connected to the A-phase circuit, and the second circuit breaker is connected to the B-phase circuit. The first circuit breaker and the second circuit breaker are protection devices corresponding to the A-phase and B-phase circuits of the three-phase 10KV line, respectively, and their main function is to protect the circuits of their respective phases from the influence of faults such as overload and short circuit.

[0030] In this embodiment, the engineering vehicle carrier is provided with a high-voltage line terminal and a grounding terminal. The high-voltage line terminal is connected to the wire of a high-voltage power supply (such as a 10kV line), and the high-voltage power supply is introduced into the simulation vehicle for fault simulation testing. The grounding terminal is a wire or copper wire connecting the test vehicle to the ground, which is used to simulate ground fault conditions to ensure the accuracy of the test.

[0031] Furthermore, a maintenance channel is provided on the rear side of the engineering vehicle carrier. The maintenance channel is an important component that ensures that technicians can safely and easily access the key components and systems of the vehicle when the vehicle needs maintenance or repair. The camera is used to monitor the environment around the vehicle, especially the live parts, to ensure the safety of the operator during the test. It is also capable of remote observation, allowing operators to remotely observe the test area in the control room, reducing the need for direct contact with dangerous areas; it can also record image data during the test for subsequent analysis and fault diagnosis. In complex or difficult to directly observe test environments, the visual assistance provided by the camera can help operators perform tasks more accurately.

[0032] Furthermore, a charging port is provided on the side of the engineering vehicle carrier. The charging port should have necessary safety protection measures, such as overload protection, short circuit protection and leakage protection, to ensure the safety of the charging process.

[0033] The specific structure of the engineering vehicle carrier in this embodiment is as follows Figure 2 As shown, high-voltage incoming lines, mutual inductors and integrated protection units are set at position 1, disconnectors and circuit breakers are set at position 2; adjustable resistors are set at position 3, arc grounding simulation devices and grounding outlets are set at position 4; maintenance access and uninterruptible power supply are set at position 5, and a control room is set at area 6.

[0034] When in use, connect one side of the cable to the 10kV line, and the other side to the high-voltage incoming line terminal at position 1 in the figure, and connect the grounding terminal at position 4 to the grounding body through a copper wire. The vehicle is powered by an uninterruptible power supply, and the test personnel conduct the test work in the vehicle control room. When a problem occurs inside the vehicle and maintenance is required, the personnel enter the vehicle for maintenance through the reserved maintenance channel.

[0035] The device integrates a variety of single-phase grounding faults into an integrated fault detection vehicle. In actual field applications, it is only necessary to drive the vehicle to the location where the fault needs to be simulated, which makes it more convenient to move. The device body does not require wiring. Only the 10kV incoming line and the grounding wire need to be connected on site, which saves a lot of test preparation time for on-site wiring. The single-phase grounding fault parameters can be adjusted in the vehicle's main control room, and the test data and grounding waveform can be recorded for subsequent research and application. Cameras are installed on the top and rear of the vehicle to ensure that the live parts can be monitored in the main control room. At the same time, the main control room is insulated to effectively ensure the safety of personnel, and tests can still be carried out in light rain.

[0036] In addition, the test vehicle can simulate various grounding methods such as metallic grounding, non-metallic grounding, arc grounding, etc. It has the characteristics of simple wiring, flexible mobility, easy use and safe operation. Compared with traditional grounding fault simulation devices, it is more suitable for distribution network field testing. Embodiment 2

[0037] The present invention also discloses a working method for simulating a single-phase grounding fault, comprising the following steps: Drive the engineering vehicle carrier to the location where fault simulation is required; The tester connects the vehicle ground wire; The line operation and maintenance personnel connect the cable to the test vehicle and then to the line under test; The tester enters the test vehicle, turns on the test host, selects the simulated fault type through the central control unit, and sets the fault parameters; Start the fault simulation and record the voltage and current waveforms during the fault simulation; After the simulation is completed, the waveform data is analyzed and recorded to verify the accuracy of the fault simulation.

[0038] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A mobile single-phase grounding fault simulation vehicle, characterized in that: include: An engineering vehicle carrier, the engineering vehicle carrier includes a cab, a component room and a control room; the component room is provided with a simulated single-phase grounding fault device; the simulated single-phase grounding fault device includes an isolating switch, a current transformer, a voltage transformer, an integrated protection unit, a circuit breaker, an adjustable resistor and a controllable arc discharge device; wherein the current transformer is used to measure the current of the loop; the voltage transformer is used to measure the voltage of the loop; the isolating switch is connected in series with the circuit breaker to control the opening and closing of the grounding loop; the integrated protection unit is used to monitor the circuit state, and cut off the circuit in time when it is detected that the grounding current is greater than a certain value and may cause danger; the adjustable resistor is used to adjust the grounding resistance to simulate the fault conditions under different grounding conditions; one end of the controllable arc discharge device is connected in series with the adjustable resistor to simulate the discharge characteristics when the arc is grounded; a test host is provided in the control room, and a central control unit is provided on the test host to comprehensively control various adjustable parameter components in the vehicle, control the opening and closing of the circuit breaker, and record data and output results.

2. A mobile single-phase grounding fault simulation vehicle according to claim 1, characterized in that: The comprehensive protection unit includes a signal acquisition unit and a single-phase grounding test protection control device. The signal acquisition unit is responsible for collecting power grid status data; the single-phase grounding test protection control device uses the data of the signal acquisition unit to simulate and protect single-phase grounding faults.

3. A mobile single-phase grounding fault simulation vehicle according to claim 1, characterized in that: The controllable arc discharge is placed as an arc grounding simulator, and the arc grounding simulator is connected to a grounding body through an insulated wire.

4. A mobile single-phase grounding fault simulation vehicle according to claim 1, characterized in that: It also includes a connecting piece connected to the tested line, and the connecting piece is connected to the isolating switch through an insulated wire.

5. A mobile single-phase grounding fault simulation vehicle according to claim 4, characterized in that: A fuse is provided between the insulated wire and the isolating switch.

6. A mobile single-phase grounding fault simulation vehicle according to claim 1, characterized in that: The circuit breaker includes a first circuit breaker and a second circuit breaker, the first circuit breaker is connected to the A-phase circuit, and the second circuit breaker is connected to the B-phase circuit.

7. The mobile single-phase grounding fault simulation vehicle according to claim 1, characterized in that: The engineering vehicle carrier is provided with a high voltage line terminal and a grounding terminal.

8. The mobile single-phase grounding fault simulation vehicle according to claim 1, characterized in that: An inspection passage is provided at the rear side of the engineering vehicle carrier.

9. The mobile single-phase grounding fault simulation vehicle according to claim 1, characterized in that: Cameras are arranged above and at the rear of the engineering vehicle carrier for the personnel in the central control room to perform safety monitoring.

10. The mobile single-phase grounding fault simulation vehicle according to claim 1, characterized in that: A charging port is provided on the side of the engineering vehicle carrier.

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