CN111273143A - Automatic test equipment for voltage resistance and leakage current of insulating boot insulating gloves - Google Patents
Automatic test equipment for voltage resistance and leakage current of insulating boot insulating gloves Download PDFInfo
- Publication number
- CN111273143A CN111273143A CN202010204992.5A CN202010204992A CN111273143A CN 111273143 A CN111273143 A CN 111273143A CN 202010204992 A CN202010204992 A CN 202010204992A CN 111273143 A CN111273143 A CN 111273143A
- Authority
- CN
- China
- Prior art keywords
- test
- voltage
- leakage current
- transformer
- insulating
- 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
Images
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
- G01R31/1263—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 solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Relating To Insulation (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to automatic pressure resistance and leakage current testing equipment for insulating boot insulating gloves, which comprises an operation control console, a transformer, a test bed and a power frequency voltage regulating unit, wherein the input end of the transformer is connected to a power supply, the output end of the transformer is connected to the test bed, the operation control console is connected with the transformer through the power frequency voltage regulating unit, the testing equipment further comprises a control and data acquisition device for converting an electric signal into an optical signal, the input end of the control and data acquisition device is connected with the signal output end of the test bed, and the output end of the control and data acquisition device is connected with a human-. Compared with the prior art, the invention adopts the optical fiber communication technology, so that the operation is thoroughly isolated from the high-voltage system, and the safety of testers is ensured.
Description
Technical Field
The invention relates to insulating boot insulating glove testing equipment, in particular to automatic testing equipment for voltage resistance and leakage current of insulating boot insulating gloves.
Background
The insulating boots and the insulating gloves are safety protection tools necessary for operation and maintenance of a power system, and the safety working rules of the electric industry stipulate the test method and period of common safety tools such as the insulating boots, the insulating gloves and the like. And in the withstand voltage test of the insulating boot and the insulating glove, the period is half a year, breakdown is not allowed in the test process, and meanwhile, the leakage current of the insulating boot is not greater than a limit value.
In contrast, chinese patent CN110687418A discloses a device for testing voltage resistance and insulation performance of a multi-path insulating glove and an insulating boot, which belongs to the technical field of insulation wearable device detection, and comprises a water tank, steel balls, a plurality of test branches and a power frequency voltage regulating unit; the water tank is filled with water or sponge full of water; each test branch comprises a step-up transformer; the input terminal of each test branch is connected with the primary side wiring terminal of the boosting transformer through a first relay and an overcurrent relay in sequence; one secondary side terminal of each step-up transformer is grounded through an alternating current-direct current digital ammeter; the other secondary side terminal of each step-up transformer is connected with an inner electrode of an insulating glove or an insulating boot; the 220V alternating current power supply terminal is connected with a primary side wiring terminal of the power frequency voltage regulating unit through an air switch and a contactor in sequence, and a secondary side wiring terminal of the power frequency voltage regulating unit is connected with the first relay; and a secondary side wiring terminal of the power frequency voltage regulating unit is connected with an alternating current-direct current digital voltmeter. However, similar to most of the insulation boot glove voltage-withstand test devices, the acquired data are still transmitted to a human-computer interaction system by adopting electric signals, and no electric isolation is realized, so that a potential safety problem exists.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide automatic test equipment for the withstand voltage and the leakage current of an insulating boot and an insulating glove, which can simultaneously test the insulating boot or the insulating glove by 8 degrees.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides an insulating boots insulating gloves is withstand voltage and leakage current automatic test equipment, includes operation control platform, transformer, test bench and power frequency voltage regulating unit, the input of transformer is connected to the power, and the output is connected to the test bench, operation control platform passes through power frequency voltage regulating unit and connects the transformer, test equipment is still including being used for the control and the data acquisition device with signal of telecommunication conversion for light signal, and the signal output part of test bench is connected to this control and data acquisition device's input, and the output passes through optical fiber connection man-machine interaction system.
And a test voltage measuring device for measuring test voltage is arranged between the transformer and the test bed and is connected with the operation control platform.
And a protective resistor is arranged between the test voltage measuring device and the transformer.
The protection resistor comprises an epoxy tube and a nickel-chromium wire wound on the epoxy tube, and two ends of the protection resistor are connected with the transformer and the voltage divider through connecting tubes.
And shielding rings are arranged at the two ends and the middle part of the protection resistor.
The test bed comprises a test article frame for fixing the insulating boots and the insulating gloves, and an electrical module comprising a leakage current test circuit and a unhooking mechanism, wherein the output end of the transformer is connected to the insulating boots and the insulating gloves arranged on the test article frame through the electrical module, and the electrical module is further connected with a control and data acquisition device.
Eight mounting positions are arranged on the test article rack, 8 paths of leakage current testing circuits and the unhooking mechanism are arranged, and 8 paths of insulation shoes, 8 paths of insulation means or 8 test articles which are combined in a mixed mode can be manufactured at the same time.
The human-computer interaction system is a computer, leakage current values in 8 paths of test processes are respectively displayed, 8 paths of leakage current limits are respectively set, withstand voltage time is set, a withstand voltage timing value is displayed, the boosting speed is adjusted in the boosting process, states of various paths of test articles are respectively displayed, the test is completed, and test data are automatically stored.
Compared with the prior art, the invention has the following beneficial effects:
1) and the optical fiber communication technology is adopted, so that the operation is thoroughly isolated from a high-voltage system, and the safety of testing personnel is ensured.
2) And simultaneously, 8 tests of the insulating boots or the insulating gloves (or 8 mixed and combined samples) are carried out, the leakage current is measured respectively, 8 paths of samples can be set with preset leakage current values respectively, when the samples exceed the preset current values in the voltage-withstanding test process, the high-voltage lead of the sample of the branch circuit is separated, other normal samples are continuously tested until the preset test time, and the batch of tests is finished.
3) The computer display screen is adopted for displaying, the display information quantity is large, and one screen simultaneously displays parameters such as 8-path high-voltage leakage current, test voltage, current, timing time and the like.
4) If the voltage-withstanding test process of some test articles exceeds the preset current value, the high-voltage lead of the test article of the branch circuit is separated, and the continuous test of other normal test articles is not influenced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a transformer
FIG. 3 is a schematic structural diagram of a power frequency voltage regulating unit;
wherein: 1. the device comprises an operation console, 2, a transformer, 4, a power frequency voltage regulating unit, 5, a control and data acquisition device, 6, an optical fiber, 7, a protective resistor, 8, a test voltage measuring device, 9, a man-machine interaction system, 31, a test article frame, 32 and an electrical module.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
An automatic test device for voltage resistance and leakage current of an insulating boot insulating glove is characterized in that a multi-path high-voltage leakage current measurement technology and an optical fiber communication technology are adopted in a system, and the purpose of safely measuring the high-voltage leakage current is achieved. Through the application of the technology, the test system is completely isolated from the high-voltage system, so that not only can the multi-path high-voltage leakage current be measured, but also the personal safety of testers is ensured.
Specifically, as shown in fig. 1, including operation control panel 1, transformer 2, test bench and power frequency voltage regulating unit 4, transformer 2's input is connected to the power, the output is connected to the test bench, operation control panel 1 passes through power frequency voltage regulating unit 4 and connects transformer 2, test equipment still including being used for with the control of signal of telecommunication conversion for light signal and data acquisition device 5, the signal output part of test bench is connected to this control and data acquisition device 5's input, the output passes through optic fibre 6 and connects human-computer interaction system.
A test voltage measuring device 8 for measuring a test voltage is arranged between the transformer 2 and the test bed, and the test voltage measuring device 8 is connected with the operation control platform 1.
A protective resistor 7 is arranged between the test voltage measuring device 8 and the transformer 2.
The protective resistor 7 comprises an epoxy tube and a nichrome wire wound on the epoxy tube, and two ends of the protective resistor are connected with the transformer 2 and the voltage divider through connecting tubes. The rated frequency is 50Hz, the rated voltage is 100kV, the rated current is 0.2A, and the nominal resistance is 5k omega. The protection resistor 7 adopts a honeycomb structure, so that heat emitted by the electric heating wire is fully exchanged with air, the protection resistor has good heat dissipation performance, the temperature of the resistor in use is reduced, and the strength of a resistor parent material cannot be reduced when the resistor parent material is heated. And the two ends and the middle part are provided with shielding rings, so that the protection resistor cannot be damaged in an insulation way when a tested object is discharged.
The test bed comprises a test article frame 31 for fixing the insulating boots and the insulating gloves and an electrical module 32 with a leakage current testing circuit and a unhooking mechanism, the output end of the transformer 2 is connected to the insulating boots and the insulating gloves arranged on the test article frame 31 through the electrical module 32, and the electrical module 32 is further connected with the control and data acquisition device 5.
Eight mounting positions are arranged on the test article rack 31, and 8 paths of drainage test circuits and unhooking mechanisms are arranged.
The human-computer interaction system is a computer, leakage current values in 8 paths of test processes are respectively displayed, 8 paths of leakage current limits are respectively set, withstand voltage time is set, a withstand voltage timing value is displayed, the boosting speed is adjusted in the boosting process, states of various paths of test articles are respectively displayed, the test is completed, and test data are automatically stored.
The equipment has the following characteristics:
1. simultaneously, 8 tests of the insulating boots or the insulating gloves are carried out, and the leakage currents are respectively measured.
2. And 8 paths of the test pieces can be respectively provided with preset leakage current values, when the test piece exceeds the preset current value in the pressure resistance test process, the high-voltage lead of the test piece of the branch circuit is separated, other normal test pieces continue to be tested until the preset test time, and the test of the batch is finished.
2. An insulating rod bracket can be optionally arranged for carrying out a voltage withstand test.
3. The computer display screen is adopted for displaying, the display information quantity is large, and one screen simultaneously displays parameters such as 8-path high-voltage leakage current, test voltage, current, timing time and the like.
4. The method can measure parameters such as test voltage, primary current of a test transformer and the like.
5. And the optical fiber communication technology is adopted, so that the operation is thoroughly isolated from a high-voltage system, and the safety of testing personnel is ensured.
6. The withstand voltage test was automatically performed. After the test is started, the voltage is increased to a preset voltage to start timing and maintain the test voltage, and the voltage is automatically reduced to zero and the power is cut off when the time is up
The overall technical parameters are as follows
Rated input voltage is 0.22kV/50 Hz;
rated capacity of 10 kVA;
the output voltage range is 1kV-100 kV;
the output voltage measurement error is less than or equal to 1 percent;
the output current measuring range is 0-30 mA/single path, 8 paths in total, 0-30mA 2-step conversion
1.0mA-10 mA/single path, 8 paths in total;
2.10mA-30 mA/single path, 8 paths in total;
the output current measurement error is less than or equal to 1 percent;
8 insulating boots or 8 insulating gloves can be simultaneously made in one batch, and the leakage current over-limit separation withstand voltage test is automatically detected;
in this embodiment, the transformer 2 is a power frequency test transformer, and has a structure as shown in fig. 2, and the main parameters are as follows. Frequency: 50 Hz; phase number: a single phase; rated capacity is 10kVA/2 string; rated input voltage is 0.22 kV; rated output voltage is 2X 50kV (50 kV/100mA is output by a single unit, and 100kV/100mA is output by two units); rated input current is 45.4A/2 strings; the rated output current is 100 mA; impedance voltage: single stage no more than 10%; a cooling mode: oil immersion self-cooling; overpressure capacity: the test transformer is continuously operated for 60S at the rated voltage of 110 percent Un, and any damage to the test transformer cannot be caused; noise: less than 60 dB; insulation level: the ground working frequency withstand voltage level of the low-voltage input terminal is 3kV/1 min; winding to ground insulation: the high-voltage winding pair is not less than 1500 MOmega to the low voltage and the measuring winding and the ground; the low-voltage winding pair is not less than 1500 MOmega to the high voltage and the measuring winding and the ground; the high-voltage and low-voltage windings of the measuring winding pair and the ground are more than or equal to 1500 MOmega; operating time: running for 30 minutes at 100% rated voltage and 100% rated current; the continuous operation is interrupted under 85 percent of rated voltage and 50 percent of rated current; temperature rise, wherein the oil surface temperature is less than or equal to 55K and the coil temperature is less than or equal to 65K under the rated operation working condition; the structure is as follows: the top grading ring outputs high voltage; the moving mode is as follows: a fixed + split mobile chassis; weight: lower 60kg, upper 50 kg.
The structure of the power frequency voltage regulating unit 4 is shown in fig. 3, and the main parameters are as follows: phase number: a single phase; frequency: 50 Hz; rated capacity: 10 kVA; rated input voltage: 0.22 kV; rated output voltage: 0-0.25 kV; rated input current: 45.5A; output current: 0-40A; short-circuit impedance: less than or equal to 7 percent (within the range of 50 to 100 percent of pressure regulation); the structural form is as follows: contact type; a cooling mode: dry natural cooling; and (3) voltage regulation mode: electrically regulating the voltage; insulation voltage resistance grade: the alternating current withstand voltage of the high-low voltage winding is 3kV/1 min; operating time: and a transformer.
The voltage regulation starts from zero, is uniform and smooth, the voltage variation of each stage is small, the voltage waveform output by the power frequency voltage regulation unit is kept to be sine wave, the voltage regulation mode is electric voltage regulation, an upper limiting function and a lower limiting function are arranged, the upper limiting function and the lower limiting function can prevent the voltage regulation motor from reversing to cause faults, and the voltage regulation is flexible, stable and free of jamming.
In the test bed, the leakage current test circuit comprises a 0-30mA current sensor (0-10mA/10mA-30mA conversion) and an ADC converter, a photoelectric conversion communication module and a storage battery which are integrated in a metal box body, and an insulating support is supported on an insulating boot insulating glove test article device.
The operation console 1 controls the on-off of a primary power supply of the transformer 2, the voltage boosting and reducing of the electric control power frequency voltage regulating unit, the overcurrent and overvoltage monitoring and protection, the overcurrent and overvoltage protection action warning, the voltage withstanding time timing, the test voltage measurement and display, and the test transformer input voltage and input current measurement and display. Equipped with a button for an emergency "stop" test.
The man-machine interaction unit consists of an industrial control computer and a front-end control and data acquisition module (comprising a power supply battery of the module), and data are exchanged through an optical fiber medium, so that the high voltage is completely isolated from the computer. The front-end control and data acquisition module realizes the work of 8-path leakage current conversion acquisition, conversion from leakage current analog quantity to digital quantity, automatic separation of high-voltage electrodes of related corresponding test articles when the leakage current exceeds a set limit value (the test articles do not continue to carry out a withstand voltage test any more, and the test articles which do not exceed the current limit continue to carry out the withstand voltage test until the set time), data receiving and sending and the like. The industrial control computer respectively displays the leakage current value in the process of 8 tests, respectively sets 8 leakage current limits, sets the withstand voltage time, displays the withstand voltage timing value, respectively displays the states of various tests (carrying out withstand voltage test/separating from withstand voltage test), and automatically stores the test data after the test is finished.
Claims (8)
1. The utility model provides a withstand voltage of insulating boot insulating gloves and automatic test equipment of leakage current, includes operation control cabinet (1), transformer (2), test bench and power frequency voltage regulating unit (4), the input of transformer (2) is connected to the power, and the output is connected to the test bench, operation control cabinet (1) is through power frequency voltage regulating unit (4) connection transformer (2), its characterized in that, test equipment is still including being used for the control and data acquisition device (5) of signal of telecommunication conversion light signal, and the signal output part of test bench is connected to the input of this control and data acquisition device (5), and the output passes through optic fibre (6) and connects man-machine interactive system.
2. The automatic insulation-boot glove withstand voltage and leakage current testing apparatus according to claim 1, wherein a test voltage measuring device (8) for measuring a test voltage is provided between the transformer (2) and the test stand, and the test voltage measuring device (8) is connected to the operation console (1).
3. The automatic insulation-boot glove withstand voltage and leakage current testing apparatus according to claim 2, wherein a protective resistor (7) is provided between the test voltage measuring device (8) and the transformer (2).
4. The automatic test equipment for the withstand voltage and the leakage current of the insulating boot gloves according to claim 3, wherein the protection resistor (7) comprises an epoxy tube and a nickel-chromium wire wound on the epoxy tube, and the two ends of the protection resistor are connected with the transformer (2) and the voltage divider through connecting tubes.
5. The automatic insulation boot glove withstand voltage and leakage current testing apparatus according to claim 3, wherein the protective resistor (7) has shielding rings at both ends and in the middle.
6. The automatic insulation boot glove voltage withstand and leakage current testing equipment according to claim 1, wherein the test bed comprises a test article frame (31) for fixing the insulation boot and the insulation glove, an electrical module (32) comprising a leakage current testing circuit and a tripping mechanism, the output end of the transformer (2) is connected to the insulation boot and the insulation glove which are installed on the test article frame (31) through the electrical module (32), and the electrical module (32) is further connected with a control and data acquisition device (5).
7. The automatic testing equipment for the withstand voltage and the leakage current of the insulating boot gloves according to claim 6, wherein eight mounting positions are arranged on the test sample rack (31), and 8 paths are arranged on the leakage current testing circuit and the unhooking mechanism.
8. The automatic testing equipment for voltage resistance and leakage current of the insulating boot gloves according to claim 7, wherein the human-computer interaction system is a computer, which respectively displays the leakage current value in 8 testing processes, respectively sets 8 leakage current limits, respectively sets the voltage resistance time, displays the voltage resistance timing value, adjusts the voltage increase speed in the voltage increase process, respectively displays the state of each test sample, completes the test and automatically stores the test data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010204992.5A CN111273143A (en) | 2020-03-23 | 2020-03-23 | Automatic test equipment for voltage resistance and leakage current of insulating boot insulating gloves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010204992.5A CN111273143A (en) | 2020-03-23 | 2020-03-23 | Automatic test equipment for voltage resistance and leakage current of insulating boot insulating gloves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111273143A true CN111273143A (en) | 2020-06-12 |
Family
ID=70999845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010204992.5A Pending CN111273143A (en) | 2020-03-23 | 2020-03-23 | Automatic test equipment for voltage resistance and leakage current of insulating boot insulating gloves |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111273143A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002568A (en) * | 2021-11-11 | 2022-02-01 | 国网新疆电力有限公司乌鲁木齐供电公司 | Automatic water injection type pressure resistance tester |
| CN117590167A (en) * | 2023-11-20 | 2024-02-23 | 安徽轩轾科技有限公司 | Insulation detection system applied to optical storage charging detection |
-
2020
- 2020-03-23 CN CN202010204992.5A patent/CN111273143A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002568A (en) * | 2021-11-11 | 2022-02-01 | 国网新疆电力有限公司乌鲁木齐供电公司 | Automatic water injection type pressure resistance tester |
| CN117590167A (en) * | 2023-11-20 | 2024-02-23 | 安徽轩轾科技有限公司 | Insulation detection system applied to optical storage charging detection |
| CN117590167B (en) * | 2023-11-20 | 2024-05-10 | 安徽轩轾科技有限公司 | Insulation detection system applied to optical storage charging detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102508087B (en) | Integrated test stand for transformers | |
| CN105974290B (en) | A kind of dry-type air-core reactor turn-to-turn insulation performance detecting system and method | |
| CN106226564B (en) | Routine test transfer box for high-voltage capacitance type voltage transformer without disassembling lead | |
| CN111273143A (en) | Automatic test equipment for voltage resistance and leakage current of insulating boot insulating gloves | |
| CN103149506B (en) | Power transformer interturn insulation surface bubble partial discharge simulation experimental platform and experimental method | |
| CN102096031A (en) | Apparatus for testing ageing resistance and water tree resistance performances of medium voltage cable | |
| CN211878114U (en) | Automatic test equipment for voltage resistance and leakage current of insulating boot insulating gloves | |
| CN201886100U (en) | Equipment for testing ageing resistance and water-tree resistance of medium voltage cable | |
| CN112415429B (en) | Medium voltage grounding fault intelligent diagnostic instrument | |
| CN104007354A (en) | Whole-group test circuit and method for 10 kV zinc oxide lightning arrester and cable | |
| CN206096309U (en) | Ferroresonance detects and prevention and cure combined test platform | |
| CN205450042U (en) | Experimental switching operation platform of power transformer | |
| CN205139307U (en) | 500kV high pressure parallel reactor interturn insulation capability test device | |
| CN218546873U (en) | Insulation resistance tester based on capacitance partial pressure restraines induced voltage | |
| CN205844468U (en) | Dry-type air-core reactor turn-to-turn insulation performance test system | |
| CN116430165A (en) | Power grid fault detection device and method | |
| CN114006523B (en) | Test discharging device and method for flexible direct current converter valve power module | |
| CN214174589U (en) | Power distribution true test load simulation device | |
| CN201917638U (en) | Insulation-resistance and withstand-voltage experimental facility | |
| CN205941623U (en) | High pressure electric capacity type voltage transformer does not tear open and draws line method routine test switching box | |
| CN205404734U (en) | Transformer bushing is situated between and decreases continuous testing arrangement | |
| CN216285604U (en) | Subway GIS high tension switchgear system detection device | |
| CN210954179U (en) | Multipurpose frequency conversion cvt resonance device | |
| CN220983350U (en) | Test main clamp for comprehensive test platform of transformer | |
| CN219475657U (en) | Automatic wire changing device for high-voltage insulation test |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: No. 1122 Yuanshen Road, Shanghai Pudong New Area Free Trade Pilot Area, 200122 Applicant after: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Applicant after: EAST CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Applicant after: SHANGHAI HENGNENGTAI ENTERPRISE MANAGEMENT Co.,Ltd. PUNENG POWER TECHNOLOGY ENGINEERING BRANCH Applicant after: SHANGHAI SIGU ELECTRIC POWER Co.,Ltd. Address before: 200437 102, building 2, No.171 Handan Road, Hongkou District, Shanghai Applicant before: SHANGHAI HENGNENGTAI ENTERPRISE MANAGEMENT Co.,Ltd. PUNENG POWER TECHNOLOGY ENGINEERING BRANCH Applicant before: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Applicant before: EAST CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Applicant before: SHANGHAI SIGU ELECTRIC POWER Co.,Ltd. |
|
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |