CN116559605A - GIS equipment same-frequency same-phase withstand voltage test device with safety protection - Google Patents
GIS equipment same-frequency same-phase withstand voltage test device with safety protection Download PDFInfo
- Publication number
- CN116559605A CN116559605A CN202310512349.2A CN202310512349A CN116559605A CN 116559605 A CN116559605 A CN 116559605A CN 202310512349 A CN202310512349 A CN 202310512349A CN 116559605 A CN116559605 A CN 116559605A
- Authority
- CN
- China
- Prior art keywords
- test
- frequency
- gis
- tested
- voltage
- 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.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 105
- 230000015556 catabolic process Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 10
- 230000007547 defect Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/065—Means for detecting or reacting to mechanical or electrical defects
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The embodiment of the application provides a GIS equipment same frequency homophase withstand voltage test device with safety protection, includes: the device comprises a control box, a test power supply and GIS equipment to be tested; one end of the test power supply is connected with a voltage divider of the tested GIS equipment through a booster, a first tripping device is arranged between the control box and the bus voltage transformer and used for receiving the test power supply frequency phase control signal and cutting off the connection of the control box and the bus voltage transformer, a second tripping device is arranged between the control box and the tested GIS equipment and used for receiving the test power supply frequency phase control signal and cutting off a tested breaker of the tested GIS equipment and the connection of the tested GIS equipment and the voltage divider. The method and the device can ensure the safety and stability of the GIS equipment common-frequency and common-phase withstand voltage test.
Description
Technical Field
The application relates to the field of power control, in particular to a GIS equipment same-frequency and same-phase withstand voltage test device with safety protection.
Background
GIS equipment (Gas Insulated Switchgear, gas-insulated metal-enclosed switchgear) is a set of combined electrical apparatus, including circuit breaker and two isolator. GIS equipment has its peculiar advantage relative to traditional switchgear, and the transformer substation under various voltage levels is used on a large scale. Since the current power grid system is in a rapid development stage, the investment and reconstruction of a large number of substations with GIS equipment are unavoidable, and in order to ensure the safety and reliability of the investment and reconstruction of GIS equipment in the operation, a series of inspection work must be performed before the operation. The method for checking the operation safety of GIS equipment at present is to perform an on-site insulation alternating current withstand voltage test.
The GIS equipment same-frequency same-phase alternating current voltage withstand technology enables operation safety inspection to be performed under the condition that adjacent interval power grids normally operate without power outage when operation safety inspection is performed on GIS equipment at present, and the method improves operation reliability of the power grids to a great extent. The GIS equipment same-frequency and same-phase alternating current withstand voltage test can avoid the influence on the normal operation of the power grid due to the fact that the original adjacent intervals are powered off and grounded due to overhaul or extension to a certain extent.
However, in the same-frequency and same-phase alternating-current withstand voltage test process of the GIS equipment, a breaker fracture or a disconnecting switch fracture inside the GIS equipment may break down due to internal defects of the GIS equipment.
For the test loop of the live bus, because one end of the GIS equipment is electrically and directly connected with the bus PT (Potential Transformer, voltage transformer) in operation through the test power supply control box, once breakdown fault occurs in the test process, the same-frequency in-phase voltage withstand test power supply can be damaged on one hand, and on the other hand, the possibility of causing larger impact to the power grid exists, and the bus is at risk of outage. Meanwhile, after breakdown fault occurs, the GIS cannot be immediately disconnected from the tested loop, and the possibility that the tested breaker is seriously deteriorated due to test and the bus side isolating switch breaks down due to high voltage exists, so that the fault range is further enlarged.
Therefore, the inventor provides a GIS equipment same-frequency same-phase withstand voltage test device with safety protection by virtue of experience and practice of related industries for many years, so as to overcome the defects of the prior art.
Disclosure of Invention
To the problem among the prior art, this application provides a GIS equipment with safety protection is same frequency homophase withstand voltage test device, can ensure GIS equipment homofrequency homophase withstand voltage test's security and stability.
In order to solve the technical problems, the application provides the following technical scheme:
in a first aspect, the present application provides a GIS device with safety protection, including: the device comprises a control box, a test power supply and GIS equipment to be tested;
one end of the test power supply is connected with a voltage divider of the tested GIS equipment through a booster and outputs test high voltage, and the voltage divider is used for reducing the test high voltage and sending a feedback signal to the control box;
the control box also receives a reference signal from a bus voltage transformer, generates a test power supply frequency phase control signal according to the feedback signal and the reference signal when the breakdown of the tested GIS equipment is judged,
a first tripping device is arranged between the control box and the bus voltage transformer and is used for receiving the test power supply frequency phase control signal and cutting off the connection between the control box and the bus voltage transformer,
the control box with be provided with the second tripping device between the GIS equipment that is surveyed, the second tripping device is used for receiving experimental power frequency phase control signal and cut off the test circuit breaker of the GIS equipment that is surveyed and the GIS equipment that is surveyed with the connection of bleeder.
Further, the second trip device includes a high voltage protection device for cutting off a high current protection device connected between the voltage divider and the control box.
Further, the first tripping device comprises a continuous tripping device for cutting off the connection between the control box and the bus voltage transformer.
Further, the second tripping device further comprises a tested breaker for directly cutting off the tested GIS equipment and a continuous tripping device for directly cutting off the connection between the voltage divider and the tested GIS equipment.
Further, the first and second trip devices include: high-current protection device, high-voltage protection device and continuous tripping device.
Further, a resistor and a variable reactance are further arranged between the booster and the voltage divider of the GIS equipment to be tested.
Further, the test device also comprises an alternating current power supply, wherein the alternating current power supply is electrically connected with the test power supply and is used for supplying power to the test power supply.
Further, the alternating current power supply adopts 380V alternating current voltage.
Further, the tested GIS equipment further comprises a bus side isolating switch which keeps a switching-off state and an outgoing line side isolating switch which keeps a switching-on state.
Further, the tested circuit breaker keeps a closing state.
According to the technical scheme, the GIS equipment same-frequency and same-phase withstand voltage test device with the safety protection is provided, the tripping device is controlled through the voltage divider feedback signal, the problem that the GIS equipment same-frequency and same-phase withstand voltage test fails to generate instantaneous high voltage and large current, the control box is burnt out, PT is damaged, the tested circuit breaker is seriously deteriorated, and the bus side isolating switch breaks down due to high voltage is further solved, and the fault range is further enlarged, namely the accident risk of bus outage is avoided. After the same-frequency and same-phase withstand voltage test fails, the high-voltage side of the test device and the control box of the test device are rapidly cut off, meanwhile, the tested breaker can be directly cut off, the transmission path between the PT of the primary side and the tested GIS of abnormally large voltage and large current is cut off, multiple functions of protecting test equipment, protecting tested primary equipment and eliminating the risk of the bus to be impacted and stopped are taken into consideration, and the safety of the same-frequency and same-phase withstand voltage test is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a GIS device with safety protection in the same frequency and same phase withstand voltage test device.
[ description of the symbols ]
1. Control box
2. Test power supply
3. Complete set of test equipment
4. Voltage booster
5. Voltage divider
6. First trip device
7. Second trip device
8. Circuit breaker
9. AC power supply
10. Resistance and variable reactance
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to a particular orientation or to be constructed and operated in a particular orientation.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "configured," "provided," "connected," "coupled," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Considering that in the same-frequency and same-phase alternating-current withstand voltage test process of the GIS equipment, the problem that the breaker fracture or the isolating switch fracture inside the GIS equipment breaks down possibly because of the internal defect existing in the GIS equipment is solved, in order to ensure the safety and stability of the same-frequency and same-phase withstand voltage test of the GIS equipment, the application provides an embodiment of the same-frequency and same-phase withstand voltage test device of the GIS equipment with safety protection, referring to fig. 1, in the embodiment, the same-frequency and same-phase withstand voltage test device of the GIS equipment with safety protection specifically comprises: a control box 1, a test power supply 2 and a whole set of test equipment 3;
one end of the test power supply 2 is connected with a voltage divider 5 of the whole set of test equipment 3 through a booster 4 and outputs test high voltage, and the voltage divider 5 is used for reducing the test high voltage and sending a feedback signal to the control box 1;
the control box 1 also receives a reference signal from a bus voltage transformer, and generates a test power supply 2 frequency phase control signal according to the feedback signal and the reference signal when the whole set of test equipment 3 is judged to break down;
a first tripping device 6 is arranged between the control box 1 and the bus voltage transformer, the first tripping device 6 is used for receiving the frequency phase control signal of the test power supply 2 and cutting off the connection between the control box 1 and the bus voltage transformer,
a second tripping device 7 is arranged between the control box 1 and the whole set of test equipment 3, and the second tripping device 7 is used for receiving the frequency phase control signal of the test power supply 2 and cutting off the tested breaker 8 of the whole set of test equipment 3 and the connection between the whole set of test equipment 3 and the voltage divider 5.
Specifically, the control box 1 further receives a reference signal from a busbar voltage transformer, and generates a test power supply 2 frequency phase control signal when determining that the whole set of test equipment 3 breaks down according to the feedback signal and the reference signal, which means that: the reference signal is obtained from the bus PT and is a stable signal. The signal fed back and output by the voltage divider is consistent with the phase frequency of the reference signal under normal conditions, the value is proportional, after the GIS is broken down, the feedback signal generates phase and value mutation, the phase frequency of the feedback signal and the value are inconsistent, the value proportion is changed, and the logic judgment can be carried out to generate breakdown, so that the signal of the tripping device is triggered.
Optionally, the test power supply 2 with the same frequency and phase is connected with the resistor and the variable reactance 10 through the booster 4 to output high voltage, the output high voltage is connected with the line-incoming side isolating switch and the breaker 8 of the tested GIS equipment, and meanwhile, the output high voltage outputs a feedback signal to the control box 1 through the voltage divider 5; the other group of reference signals of the control box 1 are obtained by a bus voltage transformer PT, and the control box 1 outputs a frequency phase control signal of the test power supply 2 and transmits the frequency phase control signal to the test power supply 2 through an optical fiber; the first tripping device 6 simultaneously controls the PT reference signal and the feedback signal of the bus voltage transformer; the second tripping device 7 simultaneously controls the tested circuit breaker 8 and the feedback signal.
Alternatively, the same-frequency and same-phase test power supply 2 cannot supply power, and a 380V alternating current power supply 9 is connected with the test power supply 2 to supply power. The test power supply 2 with the same frequency and phase is boosted by the booster 4, and then is connected with the resistor and the variable reactance 10 to output high voltage required by the test. The test high voltage is applied at the GIS and voltage divider 5 under test. The voltage divider 5 reduces the test high voltage as a feedback signal to the control box 1. The feedback signal and a reference signal from the secondary side of the bus voltage transformer PT are input into the control box 1 together and used as control signals of the frequency and the phase of the test power supply 2.
Meanwhile, the feedback signal is connected to the tripping device for monitoring. When the withstand voltage fails, the tested GIS equipment breaks down, the high-current protection device and the high-voltage protection device in the tripping device act, and the electric connection between the voltage divider 5 and the control box 1 is cut off, so that the test device is effectively protected.
Meanwhile, the continuous tripping device of the first tripping device 6 cuts off the electrical connection between the bus voltage transformer PT and the control box 1, so that the large current is prevented from flowing through a loop to burn the bus voltage transformer PT and impact on the operation bus. The continuous tripping device in the second tripping device 7 directly cuts off the breaker 8, simultaneously cuts off the connection between the voltage divider 5 and the tested GIS equipment, rapidly cuts off the tested GIS equipment and the pressurization test loop, and avoids the possibility that the tested breaker 8 is seriously deteriorated due to the test and the bus side isolating switch 201-1 breaks down due to high voltage, thereby further expanding the fault range.
According to the GIS equipment same-frequency and same-phase withstand voltage test device with safety protection provided by the embodiment of the application, the tripping device is controlled by the feedback signal of the voltage divider 5, so that the accident risk that the GIS equipment fails to generate instantaneous high voltage and large current, the control box 1 burns out, PT is damaged, the tested breaker 8 is seriously deteriorated and the bus side isolating switch breaks down due to high voltage is avoided, and the fault range is further enlarged, namely the bus is stopped. After the same-frequency and same-phase withstand voltage test fails, the high-voltage side of the test device and the control box 1 of the test device are rapidly cut off, meanwhile, the tested breaker 8 can be directly cut off, the transmission path between the PT of the primary side and the tested GIS of abnormally large voltage and large current is cut off, multiple functions of protecting test equipment, protecting tested primary equipment and resolving the risk of the bus to be impacted and stopped are taken into consideration, and the safety of the same-frequency and same-phase withstand voltage test is effectively improved.
As a preferred embodiment, the second trip device 7 comprises a high voltage protection device for breaking the connection between the voltage divider 5 and the control box 1.
As a preferred embodiment, the first tripping device 6 comprises a tripping device which cuts off the connection of the control box 1 to the busbar voltage transformer.
As a preferred embodiment, the second tripping device 7 further comprises a tripping device for directly disconnecting the tested circuit breaker 8 of the whole set of test equipment 3 and the connection between the voltage divider 5 and the tested GIS device.
As a preferred embodiment, the first and second trip devices 6 and 7 comprise: high-current protection device, high-voltage protection device and continuous tripping device.
Alternatively, the two trip devices in the present application may include a high current protection device, a high voltage protection device, and a continuous trip device.
The high-current protection device and the high-voltage protection device are used for cutting off the connection between the voltage divider 5 and the control box 1, the continuous tripping device in the first tripping device 6 is used for cutting off the connection between the bus voltage transformer PT and the control box 1, and the continuous tripping device in the second tripping device 7 is used for directly cutting off the tested breaker 8 and simultaneously cutting off the connection between the voltage divider 5 and the tested GIS equipment.
As a preferred embodiment, a resistor and a variable reactance 10 are also provided between the booster 4 and the voltage divider 5 of the whole test device 3.
As a preferred embodiment, the test device further comprises an ac power supply 9, the ac power supply 9 is electrically connected to the test power supply 2, and the ac power supply 9 is used for supplying power to the test power supply 2. The alternating current power supply 9 adopts 380V alternating current voltage.
It will be appreciated that the same frequency and phase test power supply 2 itself cannot be supplied, and that a 380V ac power supply 9 is required to be connected to the test power supply 2 for supplying power.
As a preferred embodiment, the tested GIS device further includes a bus-side isolating switch that maintains a disconnected state and an outgoing-line-side isolating switch that maintains a closed state. The tested breaker 8 keeps a closing state.
Optionally, the tested GIS device includes: (1) a tested breaker 8, keeping a closing state; (2) 201-1 is a bus side isolating switch of a GIS to be tested, and keeps a brake-off state; (3) 201-2 is an outgoing line side isolating switch of the GIS to be tested, and a closing state is maintained.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.
Claims (10)
1. The utility model provides a GIS equipment same frequency homophase withstand voltage test device with safety protection, its characterized in that includes: the device comprises a control box, a test power supply and GIS equipment to be tested;
one end of the test power supply is connected with a voltage divider of the tested GIS equipment through a booster and outputs test high voltage, and the voltage divider is used for reducing the test high voltage and sending a feedback signal to the control box;
the control box also receives a reference signal from a bus voltage transformer, generates a test power supply frequency phase control signal according to the feedback signal and the reference signal when the breakdown of the tested GIS equipment is judged,
a first tripping device is arranged between the control box and the bus voltage transformer and is used for receiving the test power supply frequency phase control signal and cutting off the connection between the control box and the bus voltage transformer,
the control box with be provided with the second tripping device between the GIS equipment that is surveyed, the second tripping device is used for receiving experimental power frequency phase control signal and cut off the test circuit breaker of the GIS equipment that is surveyed and the GIS equipment that is surveyed with the connection of bleeder.
2. The safety-protected GIS device common-frequency in-phase withstand voltage test apparatus according to claim 1, wherein the second trip device includes a large-voltage protection device for cutting off a large-current protection device connected between the voltage divider and the control box.
3. The safety-protected GIS device common-frequency in-phase withstand voltage test device according to claim 1, wherein the first tripping device comprises a continuous tripping device for disconnecting the control box from the bus voltage transformer.
4. The safety-protected GIS device common-frequency in-phase withstand voltage test apparatus according to claim 1, wherein the second trip device further comprises a tested breaker for directly cutting off the tested GIS device and a trip device for connecting the voltage divider with the tested GIS device.
5. The safety-protected GIS device common-frequency in-phase withstand voltage test apparatus according to claim 1, wherein the first trip device and the second trip device comprise: high-current protection device, high-voltage protection device and continuous tripping device.
6. The safety protection GIS equipment common-frequency in-phase withstand voltage test device according to claim 1, wherein a resistor and a variable reactance are further arranged between the booster and the voltage divider of the tested GIS equipment.
7. The safety-protected GIS device common-frequency in-phase withstand voltage test apparatus according to claim 1, further comprising an ac power source electrically connected to the test power source, the ac power source being configured to supply power to the test power source.
8. The safety-protected GIS device common-frequency in-phase withstand voltage test device according to claim 7, wherein the ac power supply adopts 380V ac voltage.
9. The safety-protected GIS device common-frequency in-phase withstand voltage test apparatus according to claim 1, wherein the tested GIS device further comprises a bus-side isolating switch that maintains a switching-off state and a line-out-side isolating switch that maintains a switching-on state.
10. The safety-protected GIS device common-frequency in-phase withstand voltage test device according to claim 1, wherein the tested circuit breaker is kept in a closed state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310512349.2A CN116559605A (en) | 2023-05-08 | 2023-05-08 | GIS equipment same-frequency same-phase withstand voltage test device with safety protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310512349.2A CN116559605A (en) | 2023-05-08 | 2023-05-08 | GIS equipment same-frequency same-phase withstand voltage test device with safety protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116559605A true CN116559605A (en) | 2023-08-08 |
Family
ID=87499562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310512349.2A Pending CN116559605A (en) | 2023-05-08 | 2023-05-08 | GIS equipment same-frequency same-phase withstand voltage test device with safety protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116559605A (en) |
-
2023
- 2023-05-08 CN CN202310512349.2A patent/CN116559605A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Smeets et al. | Switching in electrical transmission and distribution systems | |
| CN104900118A (en) | 10kV distribution network fault somatosensory training device | |
| CN110208644A (en) | GIS cable machinery | |
| CN103323743A (en) | Method for looking up ground faults by means of integrated automation transformer substation background machine | |
| CN105576621B (en) | A kind of arc light protection method | |
| KR100305921B1 (en) | Test equipment for making of ground and short in a distribution system | |
| CN204116405U (en) | A kind of GIS is with frequency homophase controlling test protective device | |
| CN114563670A (en) | On-line monitoring device and method for insulation of impact capacitor in generator outlet circuit breaker | |
| KR101826134B1 (en) | Power Receiving and Distribution Equipment with diagnosing and repairng fault | |
| CN210608530U (en) | Arc suppression cabinet and small current grounding system | |
| CN116559605A (en) | GIS equipment same-frequency same-phase withstand voltage test device with safety protection | |
| CN205620457U (en) | PT secondary voltage signal isolation sampling device based on isolation transformer | |
| CN103018631A (en) | System for 10kV fault line detection | |
| CN211554215U (en) | Fault suppression system for common-frequency and same-phase voltage withstand test of three-phase common-cylinder GIS equipment | |
| CN210514508U (en) | GIS cable equipment | |
| CN208386124U (en) | A kind of neutral point drifting protective device | |
| Tenschert | Fault location using fault distance measurement of digital relays | |
| JPH0217808A (en) | Gas insulated switchgear with single phase auxiliary bus bar | |
| CN101916993B (en) | Arc extinction system for power grid | |
| CN217159267U (en) | 10KV PT cabinet breakdown safety state feedback circuit | |
| CN202929158U (en) | 10KV grounding line selection system | |
| CN204650850U (en) | A kind of 10kV Distribution Network Failure body sense Practical training equipment | |
| KR101300752B1 (en) | Low voltage distributing board system and power supply controller on low voltage distributing board | |
| CN202534944U (en) | Power transformation system with spare-free low-voltage switch connected in parallel with by-pass switch | |
| CN217112577U (en) | Device for detecting insulating property of 10kV switch cabinet bus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |