CN221225351U - 10KV feeder line fault simulation control system for power grid - Google Patents
10KV feeder line fault simulation control system for power grid Download PDFInfo
- Publication number
- CN221225351U CN221225351U CN202322903298.4U CN202322903298U CN221225351U CN 221225351 U CN221225351 U CN 221225351U CN 202322903298 U CN202322903298 U CN 202322903298U CN 221225351 U CN221225351 U CN 221225351U
- Authority
- CN
- China
- Prior art keywords
- voltage switch
- inlet end
- wire
- power
- transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004088 simulation Methods 0.000 title claims abstract description 49
- 239000003990 capacitor Substances 0.000 claims abstract description 42
- 230000007935 neutral effect Effects 0.000 abstract description 6
- 238000003672 processing method Methods 0.000 abstract description 3
- 230000002285 radioactive effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000001052 transient effect Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model relates to the technical field of 10kV power supply of a power distribution system, and discloses a 10kV feeder line fault simulation control system of a power grid, which comprises a simulation unit, a control device and a state recording unit, wherein the control device comprises two three-phase step-up transformers and a 10kV three-phase five-column transformer; one of the inlet wire ends of the three-phase step-up transformer is connected with A, B, C input wires through a low-voltage plastic shell main switch. The system can actually simulate the faults and the processing method of the 10KV power distribution network in any neutral point operation mode according to the control command, so that the intelligent controller is suitable for various 10KV power distribution network operation environments; the physical simulation running environment of a hand-in-hand mode and a radioactive mode can be provided; through two 10KV power capacitors and the simulated mobile trolley, the dynamic change condition of fault parameters can be simulated and analyzed practically when various faults occur in any line section of the 10KV power distribution network.
Description
Technical Field
The utility model relates to the technical field of 10kV power supply of power distribution systems, in particular to a 10kV feeder fault simulation control system of a power grid.
Background
Along with the continuous development of national economy, the electricity consumption is continuously increased, and higher requirements are put forward on the power supply reliability of a power system and the accuracy and timeliness of fault treatment when various faults occur. Various intelligent controllers built on computer software simulation systems should be developed in the market place. However, the actual running of the 10kV overhead line is very different from the computer software simulation, and the device provides an actual 10kV overhead line and can actually perform physical simulation of various faults on two most representative 10kV hand-held feeder lines.
However, the current situation of the intelligent device used on site is not satisfactory, because the intelligent device designed on the computer simulation system cannot completely and practically simulate various fault forms of the 10kV power distribution network, and the performance of the intelligent control device is unreliable.
Therefore, we propose a 10KV feeder fault simulation control system for a power grid to solve the above problems.
Disclosure of utility model
The utility model aims to provide a 10KV feeder line fault simulation control system for a power grid, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the power grid 10KV feeder line fault simulation control system comprises a simulation unit and a control device, wherein the control device comprises a three-phase step-up transformer and a10 kV three-phase five-column transformer, and the three-phase step-up transformer is provided with two steps; the wire inlet end of one three-phase step-up transformer is connected with A, B, C input wires through a low-voltage plastic shell main switch, the wire outlet end of the three-phase step-up transformer is respectively connected with the wire inlet end of a first high-voltage switch, the wire inlet end of a10 kV three-phase five-column transformer and the wire inlet end of a first power capacitor bank, the wire outlet end of the first high-voltage switch is connected with the wire inlet end of a second high-voltage switch, and the wire outlet end of the second high-voltage switch is connected with the wire inlet end of a third high-voltage switch;
The outlet end of the 10kV three-phase five-column transformer is respectively connected with the inlet end of the first capacitor and the resistor which are connected in series, the inlet end of the second capacitor and the power inductor which are connected in series, and the outlet end of the first capacitor and the resistor which are connected in series, and the outlet end of the second capacitor and the inductor which are connected in series are grounded together;
The wire inlet end of the second three-phase step-up transformer is connected with A, B, C input wires through a low-voltage plastic shell main switch, the wire outlet end of the second three-phase step-up transformer is respectively connected with the wire inlet end of a fourth high-voltage switch and the wire inlet end of a second power capacitor bank, the wire outlet end of the fourth high-voltage switch is connected with the wire inlet end of a fifth high-voltage switch, the wire outlet end of the fifth high-voltage switch is connected with a public end after the wire inlet end of the sixth high-voltage switch and the wire inlet end of a seventh high-voltage switch are connected in parallel, and the wire outlet end of the sixth high-voltage switch and the wire outlet end of the third high-voltage switch are respectively connected with the wire inlet end and the wire outlet end of a handle switch;
The output end of the simulation unit is connected with a server, and the server comprises a state recording unit which is used for recording the state of the electrical data in the simulation unit; setting a change comparison unit in cooperation with the state recording unit, and comparing the electric data states in the simulation unit front and back; and a restoration operation unit is arranged in cooperation with the change comparison unit to restore the change operation in the simulation unit.
As an alternative to the grid 10KV feeder fault simulation control system of the utility model, wherein: the first power capacitor bank and the second power capacitor bank are respectively connected with A, B, C three-phase lines.
As an alternative to the grid 10KV feeder fault simulation control system of the utility model, wherein: the first power capacitor bank and the second power capacitor bank are both provided with grounding.
As an alternative to the grid 10KV feeder fault simulation control system of the utility model, wherein: the first high-voltage switch, the second high-voltage switch, the third high-voltage switch, the fourth high-voltage switch, the fifth high-voltage switch, the sixth high-voltage switch, the handle switch and the seventh high-voltage switch are respectively provided with an intelligent controller.
As an alternative to the grid 10KV feeder fault simulation control system of the utility model, wherein: the power supply side circuits of the first high-voltage switch outlet side, the second high-voltage switch, the third high-voltage switch and the handle switch are provided with an analog mobile first trolley consisting of impedance and capacitance; the load side circuits of the fourth high-voltage switch outlet side, the fifth high-voltage switch, the sixth high-voltage switch, the seventh high-voltage switch and the handle switch are provided with an analog mobile second trolley consisting of impedance and capacitance.
As an alternative to the grid 10KV feeder fault simulation control system of the utility model, wherein: and intelligent controllers are arranged in the first trolley and the second trolley.
As an alternative to the grid 10KV feeder fault simulation control system of the utility model, wherein: the first trolley and the second trolley are both provided with grounding wires.
As an alternative to the grid 10KV feeder fault simulation control system of the utility model, wherein: the state recording unit comprises a recording annotation unit.
Compared with the prior art, the utility model has the beneficial effects that:
1. The 10KV feeder line fault simulation control system of the power grid can simulate the faults and the processing method of the 10KV power distribution network in any neutral point operation mode according to the control command in practice, so that the intelligent controller is suitable for various 10KV power distribution network operation environments; the physical simulation running environment of a hand-in-hand mode and a radioactive mode can be provided; through the two 10KV power capacitors and the simulated mobile trolley, the dynamic change condition of the fault parameters can be simulated and analyzed in practice when various faults occur in any line section of the 10KV power distribution network, so as to optimize the fault parameter acquisition scheme; the transient steady state change condition of fault electrical parameters under various fault states is simulated and analyzed through various operation modes of the system, and the control logic of the intelligent control device is optimized, so that the reliability of the 10KV power distribution network is improved, the isolated fault section is accurately judged, and the power supply reliability of the non-fault section is recovered to the maximum extent;
2. The 10KV feeder line fault simulation control system of the power grid is used for recording the operation state, the electrical state and the comparison information in real time, is used for staff to learn and master working skills so that subsequent work can be rapidly and efficiently processed by faults, is provided with a restoration operation unit, can be used for restoring the change operation in the simulation unit, and is used for correcting the fault operation in time and is convenient to use.
Drawings
FIG. 1 is a schematic diagram of a structural unit of the present utility model;
FIG. 2 is a main wiring diagram of the power capacitor bank of the present utility model;
fig. 3 is a main wiring diagram of the trolley of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-3, the present utility model provides a technical solution: comprises a simulation unit and a control device.
It is necessary to explain that: the simulation unit has disclosed a specific structure in a physical simulation device for processing the feeder line faults of a 10kV power grid in Chinese patent publication No. CN 206117135U.
The control device comprises two three-phase step-up transformers 1 which are three-phase 10KV step-up transformers and a 10kV three-phase five-column transformer which are step-up by low-voltage three-phase 380V, wherein the wire inlet end of one three-phase step-up transformer 1 is connected with three input wires of A, B, C through a low-voltage molded case main switch JC1, the wire outlet end of the three-phase step-up transformer 1 is connected with the wire inlet end of a first high-voltage switch RC1, the wire inlet end of the 10kV three-phase five-column transformer 2 is connected with the wire inlet end of a first power capacitor bank C9, the wire outlet end of the first high-voltage switch RC1 is connected with the wire inlet end of a second high-voltage switch F1, and the wire outlet end of the second high-voltage switch F1 is connected with the wire inlet end of a third high-voltage switch F2; the outgoing line end of the 10kV three-phase five-column transformer 2 is respectively connected with the incoming line end of the first capacitor JR and the resistor R which are connected in series, the incoming line end of the second capacitor JL and the power inductor L3 which are connected in series, the outgoing line end of the first capacitor JR and the resistor R which are connected in series, the outgoing line end of the second capacitor JL and the outgoing line end of the inductor L2 which are connected in series are commonly grounded, namely, the serial circuit of the first capacitor JR and the resistor R and the serial circuit of the second capacitor JL and the power inductor L3 are connected in parallel, one end of the serial circuit is connected into the 10kV three-phase five-column transformer 2, one end of the serial circuit is connected into the ground, and single-circuit connection is realized by adjusting the sizes of the inductor and the resistor.
The wire inlet end of the second three-phase step-up transformer 1 is connected with three input wires of A, B, C through a low-voltage molded case main switch JC2, the wire outlet end of the second three-phase step-up transformer 1 is connected with the wire inlet end of a fourth high-voltage switch RC2 and the wire inlet end of a second power capacitor bank C12, the wire outlet end of the fourth high-voltage switch RC2 is connected with the wire inlet end of a fifth high-voltage switch F3, the wire outlet end of the fifth high-voltage switch F3 is connected with a common end after the wire inlet end of a sixth high-voltage switch F4 and the wire inlet end of a seventh high-voltage switch D1 are connected in parallel, and the wire outlet end of the sixth high-voltage switch F4 and the wire outlet end of the third high-voltage switch F2 are respectively connected with the wire inlet end and the wire outlet end of a handle switch L1.
In this embodiment, intelligent controllers of VTIC schemes are respectively provided in the first high-voltage switch RC1, the second high-voltage switch F1, the third high-voltage switch F2, the fourth high-voltage switch RC2, the fifth high-voltage switch F3, the sixth high-voltage switch F4, the handle switch L1 and the seventh high-voltage switch D1, and the first high-voltage switch RC1 and the fourth high-voltage switch RC2 are 10kV.
Referring to fig. 2, fig. 2 is a main wiring diagram of the power capacitor bank of the present utility model; the power capacitor bank C9 and the power capacitor bank C12 are respectively connected with A, B, C three-phase lines, and the first power capacitor bank C9 and the second power capacitor bank C12 are both provided with grounding wires.
Referring to fig. 3, fig. 3 is a main wiring diagram of the trolley according to the present utility model, wherein the control device is further provided with an analog mobile first trolley 3 composed of impedance and capacitance on the outgoing line side of the first high-voltage switch RC1, on the power supply side lines of the second high-voltage switch F1, the third high-voltage switch F2 and the handle switch L1; the load side circuits of the fourth high-voltage switch RC2 outlet side, the fifth high-voltage switch F3, the sixth high-voltage switch F4, the seventh high-voltage switch D1 and the handle switch L1 are provided with a simulation mobile type second trolley 4 composed of impedance and capacitance, intelligent controllers are arranged in the first trolley 3 and the second trolley 4 and used for controlling the movement of the trolley, and the trolley can simulate power grid load, short circuit faults or overcurrent faults or various grounding faults (including various types of medium-resistance and high-resistance grounding faults and arc grounding faults) which occur at different positions after fault points according to the movement of the controllers.
When the neutral point is not grounded, the second three-phase step-up transformer 1 is started, the line capacitance to the ground before the fault point is simulated through the second power capacitor bank C12, and the power grid load, the short circuit fault or the overcurrent fault or various grounding faults (including various types of medium-resistance and high-resistance grounding faults and arc grounding) after the fault point is simulated through the combination input of the second trolley 4. The seven high-voltage switches are all provided with intelligent controllers, and are connected with the server through the communication device of the controllers, so that various transient state electric and position equal components and steady state electric and position equal components when faults occur are sampled and analyzed;
When a neutral point is simulated through an arc suppression coil grounding system, the three-phase step-up transformer 1 is started, the line capacitance to the ground before the fault point is simulated through the first power capacitor bank C9, and the power grid load, the short circuit fault or the overcurrent fault or various grounding faults (including various types of medium-resistance and high-resistance grounding faults and arc grounding) after the fault point is simulated through the combination input of the first trolley 3. While simulating the ground fault, simulating an arc suppression coil compensation system through a second capacitor JL and a power input inductor L3, and analyzing various transient electric and position equal components and steady electric and position equal components when the fault occurs because seven high-voltage switches are all provided with intelligent controllers and are connected with a server through a communication device of the controllers;
When the simulated neutral point passes through the small-resistance grounding system, the first three-phase step-up transformer 1 is started, the line capacitance to the ground before the fault point is simulated through the first power capacitor bank C9, and the power grid load, the short-circuit fault or the overcurrent fault or various grounding faults (including various types of medium-resistance, high-resistance grounding faults and arc grounding) after the simulated fault point is put into the combined type of the first trolley 3. While simulating the ground fault, the second capacitor JR and the resistor R are used for inputting 60 ohm high voltage to simulate the grounding of a small resistor, and as the seven high-voltage switches are all provided with intelligent controllers, the seven high-voltage switches are connected with a server through a communication device of the controllers, various transient state electric and position equal components and steady state electric and position equal components when the fault occurs are sampled and analyzed;
The system can actually simulate the faults and the processing method of the 10KV power distribution network in any neutral point operation mode according to the control command, so that the intelligent controller is suitable for various 10KV power distribution network operation environments; the physical simulation running environment of a hand-in-hand mode and a radioactive mode can be provided; through the two 10KV power capacitors and the simulated mobile trolley, the dynamic change condition of the fault parameters can be simulated and analyzed in practice when various faults occur in any line section of the 10KV power distribution network, so as to optimize the fault parameter acquisition scheme; through various operation modes of the system, transient steady state change conditions of fault electrical parameters under various fault states are simulated and analyzed, and control logic of the intelligent control device is optimized, so that reliability of the 10KV power distribution network is improved, fault isolation sections are accurately judged, and power supply reliability of non-fault sections is recovered to the maximum extent.
As a further improvement of the present embodiment: the output end of the simulation unit is connected with a server, and the server comprises a state recording unit which is used for recording the state of the electrical data in the simulation unit; the change comparison unit is arranged in cooperation with the state recording unit, and the electric data states in the simulation unit are compared front and back, so that workers learn and master working skills, and follow-up work can be performed quickly and efficiently; the cooperation change comparison unit is provided with a restoration operation unit, so that the change operation in the simulation unit is restored, and the error operation is corrected in time.
Further, the state recording unit includes a recording annotation unit for operation annotation for subsequent understanding of the operation cause.
Namely, the operation state, the electrical state and the comparison information can be recorded in real time, and the fault processing device is used for enabling staff to learn and master working skills so that follow-up work can be rapidly and efficiently processed, and the recovery operation unit is arranged, so that the recovery of the change operation in the simulation unit can be performed, and the fault processing device is used for correcting error operation in time and is convenient to use.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a 10KV feeder fault simulation control system of electric wire netting, includes simulation unit and controlling means, its characterized in that: the control device comprises a three-phase step-up transformer (1) and a 10kV three-phase five-column transformer (2), wherein the three-phase step-up transformer (1) is provided with two three-phase step-up transformers; the wire inlet end of one three-phase step-up transformer (1) is connected with A, B, C input wires through a low-voltage plastic shell main switch (JC 1), the wire outlet end of the three-phase step-up transformer (1) is respectively connected with the wire inlet end of a first high-voltage switch (RC 1), the wire inlet end of a 10kV three-phase five-column transformer (2) and the wire inlet end of a first power capacitor bank (C9), the wire outlet end of the first high-voltage switch (RC 1) is connected with the wire inlet end of a second high-voltage switch (F1), and the wire outlet end of the second high-voltage switch (F1) is connected with the wire inlet end of a third high-voltage switch (F2);
The outlet end of the 10kV three-phase five-column transformer (2) is respectively connected with the inlet end of the first capacitor (JR) and the resistor (R) which are connected in series, the inlet end of the second capacitor (JL) and the power inductor (L3) which are connected in series, and the outlet end of the first capacitor (JR) and the resistor (R) which are connected in series, and the outlet end of the second capacitor (JL) and the inductor (L2) which are connected in series are connected with the common ground wire;
The wire inlet end of the second three-phase step-up transformer (1) is connected with A, B, C input wires through a low-voltage molded case main switch (JC 2), the wire outlet end of the second three-phase step-up transformer (1) is respectively connected with the wire inlet end of a fourth high-voltage switch (RC 2) and the wire inlet end of a second power capacitor bank (C12), the wire outlet end of the fourth high-voltage switch (RC 2) is connected with the wire inlet end of a fifth high-voltage switch (F3), the wire outlet end of the fifth high-voltage switch (F3) is connected with a public end of a sixth high-voltage switch (F4) and the wire inlet end of a seventh high-voltage switch (D1) which are connected in parallel, and the wire outlet end of the sixth high-voltage switch (F4) and the wire outlet end of a third high-voltage switch (F2) are respectively connected with the wire inlet end and the wire outlet end of a pull switch (L1);
The output end of the simulation unit is connected with a server, and the server comprises a state recording unit which is used for recording the state of the electrical data in the simulation unit; setting a change comparison unit in cooperation with the state recording unit, and comparing the electric data states in the simulation unit front and back; and a restoration operation unit is arranged in cooperation with the change comparison unit to restore the change operation in the simulation unit.
2. The power grid 10KV feeder fault simulation control system of claim 1, wherein: the first power capacitor bank (C9) and the second power capacitor bank (C12) are respectively connected with A, B, C three-phase lines.
3. The power grid 10KV feeder fault simulation control system of claim 1, wherein: the first power capacitor group (C9) and the second power capacitor group (C12) are both provided with grounding.
4. The power grid 10KV feeder fault simulation control system of claim 1, wherein: the intelligent control device comprises a first high-voltage switch (RC 1), a second high-voltage switch (F1), a third high-voltage switch (F2), a fourth high-voltage switch (RC 2), a fifth high-voltage switch (F3), a sixth high-voltage switch (F4), a handle switch (L1) and a seventh high-voltage switch (D1).
5. The power grid 10KV feeder fault simulation control system of claim 1, wherein: the power supply side circuits of the first high-voltage switch (RC 1) outlet side, the second high-voltage switch (F1), the third high-voltage switch (F2) and the handle switch (L1) are provided with an analog mobile first trolley (3) composed of impedance and capacitance; the load side circuits of the fourth high-voltage switch (RC 2) on the outlet side, the fifth high-voltage switch (F3), the sixth high-voltage switch (F4), the seventh high-voltage switch (D1) and the handle switch (L1) are provided with an analog mobile type second trolley (4) composed of impedance and capacitance.
6. The power grid 10KV feeder fault simulation control system of claim 5, wherein: and intelligent controllers are arranged in the first trolley (3) and the second trolley (4).
7. The power grid 10KV feeder fault simulation control system of claim 5, wherein: the first trolley (3) and the second trolley (4) are both provided with grounding wires.
8. A power grid 10KV feeder fault simulation control system according to any of claims 1-7, wherein: the state recording unit comprises a recording annotation unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322903298.4U CN221225351U (en) | 2023-10-29 | 2023-10-29 | 10KV feeder line fault simulation control system for power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322903298.4U CN221225351U (en) | 2023-10-29 | 2023-10-29 | 10KV feeder line fault simulation control system for power grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221225351U true CN221225351U (en) | 2024-06-25 |
Family
ID=91574015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322903298.4U Active CN221225351U (en) | 2023-10-29 | 2023-10-29 | 10KV feeder line fault simulation control system for power grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221225351U (en) |
-
2023
- 2023-10-29 CN CN202322903298.4U patent/CN221225351U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106251747B (en) | Power distribution network simulation system | |
| CN103424669B (en) | A kind of selection method utilizing fault feeder zero-sequence current matrix principal component analysis (PCA) first principal component | |
| CN108957245B (en) | Flexible direct-current power distribution network single-pole fault identification method based on full fault current | |
| CN109001592B (en) | Transient-quantity-based single-phase earth fault line selection method for resonance grounding system | |
| CN103163430A (en) | Resonant grounding system fault line selection method by combining complex wavelets with ANN (artificial neural network) | |
| CN204422692U (en) | A kind of small current grounding failure wire selection system | |
| CN221225351U (en) | 10KV feeder line fault simulation control system for power grid | |
| CN112364539B (en) | Current limiter of high-coupling split reactor and structural layout design method and device thereof | |
| CN117610287A (en) | Three-dimensional visual simulation method for single-point ground fault of direct-current system of transformer substation | |
| CN106443334A (en) | Zero sequence current difference polarity comparison based power distribution network fault line selection method | |
| CN104410159A (en) | Power grid black start overall process checking method based on real-time digital simulation | |
| CN206117135U (en) | 10kV electric wire netting feeder fault handling physical simulation device | |
| CN2387653Y (en) | Arc-eliminating coil microcomputer auto-tuning and earthing line-selecting device | |
| CN113341267B (en) | Safety analysis method for transformation of neutral point grounding mode of power distribution network | |
| CN106159920B (en) | A kind of 10kV power grids feeder fault processing physics simulator | |
| Máslo et al. | Asymmetrical, Three-phase Power System Model: Design and Application | |
| CN113702771A (en) | Zero-sequence current amplitude comparison grounding line selection method and system for zero-sequence voltage maximum value | |
| Helać et al. | Power Transformer Neutral Point Grounding Methods: Analysis of Fault Characteristics | |
| CN216014029U (en) | Multi-fault-type electric circuit setting controller | |
| CN213750275U (en) | True ground fault simulation experiment system for power distribution network | |
| CN215682123U (en) | Neutral point grounding device on converter transformer valve side | |
| CN218788232U (en) | Multimode feeder automation training set | |
| CN210295097U (en) | Low-current ground fault line selection equipment | |
| CN218445856U (en) | Automatic test system of intelligent circuit breaker | |
| CN113740652B (en) | Power distribution system based on automatic fault isolation and recovery and testing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant |