CN201335872Y - Power-frequency inductance-change resonance voltage-withstanding testing device - Google Patents
Power-frequency inductance-change resonance voltage-withstanding testing device Download PDFInfo
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- CN201335872Y CN201335872Y CNU2009200835212U CN200920083521U CN201335872Y CN 201335872 Y CN201335872 Y CN 201335872Y CN U2009200835212 U CNU2009200835212 U CN U2009200835212U CN 200920083521 U CN200920083521 U CN 200920083521U CN 201335872 Y CN201335872 Y CN 201335872Y
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Abstract
The utility model relates to a power-frequency inductance-change resonance voltage-withstanding testing device. The device comprises a voltage regulation control device for a testing transformer, an excitation transformer, a fixed reactor, a micro-adjusting reactor, a compensation capacitor and a capacitive voltage divider, wherein, an AC 220v output terminal of the voltage regulation control device for the testing transformer is connected with an input terminal of the excitation transformer; an output terminal of the excitation transformer is connected with an input terminal of the micro-regulating reactor; an output terminal of the micro-regulating reactor is connected with an input terminal of the fixed reactor; an output terminal of the fixed reactor is connected with an object to be tested; and the compensation capacitor and the capacitive voltage divider are respectively connected with the object to be tested in series. According to the different requirements of the objects to be tested, a plurality of the fixed reactors and the compensation capacitors can be respectively selected and connected in parallel or in series. The utility model has the advantages of wide application, expanding function, over-voltage protection, over-current protection and the like.
Description
Technical field
The utility model relates to electrical equipment commissioning test equipment, particularly a kind of industrial frequency inductance-regulation resonance pressure-resistant proving installation.
Background technology
According to stipulating about the power cable AC voltage withstand test in GB GB50150-2006 " electrical equipment commissioning test standard " the 18.0.5 bar: rubber plastic cable preferentially adopts the 20-300Hz AC voltage withstand test; For rated voltage U0/U is cable more than the 18/30kV, should adopt ac voltage withstanding.Existing ac test power supply can be divided into following three kinds:
1. traditional compensator transformer power supply (ACTC): this apparatus function is single, can not satisfy the particularly AC voltage withstand test of power cable of multiple high-tension apparatus simultaneously.
2. the large-scale inductance-regulation resonance power supply of power frequency (ACRL): this device only adopts during the system test more than 35kV at present, and device volume is huge, the structure heaviness.
3. frequency conversion resonance vibration power supply (ACRF): the trial voltage that this device provides can not correctly reflect the power frequency working environment of high-tension apparatus, and device performance is unreliable and cost an arm and a leg.
Summary of the invention
Technical problem to be solved in the utility model is: a kind of industrial frequency inductance-regulation resonance pressure-resistant proving installation is provided, this device can satisfy the industrial frequency withstand voltage commissioning test of the test specimens such as transformer, generator, motor, high-voltage switch gear, high-tension cable and other relevant devices of 35kV and following high-pressure system in the metallurgical industry electrical installation project simultaneously, puts into operation to guarantee high-tension apparatus safety.
The technical scheme that its technical matters that solves the utility model adopts is: comprise testing transformer Regulation Control device, exciting transformer, constant reactance device, fine setting reactor, compensation condenser, capacitive divider.The annexation of each parts is: the alternating current 220V input end of the output termination exciting transformer of testing transformer Regulation Control device, the output terminal of exciting transformer is connected to the input end of fine setting reactor, the output terminal of fine setting reactor is connected to the input end of constant reactance device, the output terminal of constant reactance device is connected to tested thing, and compensation condenser, capacitive divider are connected in parallel with tested thing respectively; According to the different needs of tested thing, constant reactance device, compensation condenser select many to carry out parallel connection or be connected in series respectively.
The utility model compared with prior art has following major advantage:
One. use wide: can utilize power frequency brick pattern controllable impedance to produce resonant power (ACRL) according to the inductance-regulation resonance principle, when different reactors mate, satisfy the power frequency withstand test of above-mentioned test specimen simultaneously.Different reactor couplings are meant testing transformer Regulation Control device, exciting transformer, constant reactance device, fine setting reactor, compensation condenser and capacitive divider etc. are reasonably made up and parameter configuration.By table 1 and table 2 test figure as can be known, this device can satisfy the AC voltage withstand test of following test product:
Satisfy 35kV, 0～0.6 kilometer of length, sectional area 300mm
2And the AC voltage withstand test of the cable of following capacity;
Satisfy 10kV, 0～1.5 kilometer of length, sectional area 300mm
2And the AC voltage withstand test of the cable of following capacity;
Satisfy 10kV, the AC voltage withstand test of the transformer of electric capacity≤25000pf;
Satisfy AC voltage withstand test such as 35kV/31500kVA and following transformer, 35kV switch, the highest trial voltage 120kV.
They are two years old. have expanded function: under the situation that increases the one piece apparatus capacity, can satisfy beyond the above-mentioned test specimen scope, the power frequency withstand test of the high voltage electric equipment of voltage≤35kV.Under the situation that increases testing transformer, high pressure silicon post and high-voltage capacitance, the DC voltage withstand test of the compatible above-mentioned test specimen of energy.Being suitable for smelter construction stage field adjustable uses.
They are three years old. have overvoltage protection and excess current protective function: can be according to tested thing different, the protection setting valve of superpotential and excess current is made respective settings.The experiment work power supply adopts the 220V AC power, and measurement electric current, voltage adopt digital display meter directly to read.
They are four years old. and volume is little, and is in light weight, and dependable performance is convenient to onsite moving and stack.
Description of drawings
Fig. 1 is reactor series wiring test synoptic diagram.
Fig. 2 is reactor and tie test synoptic diagram.
Fig. 3 is 4kVA exciting transformer (ET) schematic diagram.
Fig. 4 is constant reactance device (FR) structural representation.
Fig. 5 is fine setting reactor (FRR) structural representation.
Fig. 6 is capacitive divider (CVD) structural representation.
Embodiment
The principle of the utility model institute foundation is:
According to formula X
L=2 π fL X
C=1/2 π fC works as X
L=X
CThe time series resonance, promptly have:
Formula 1
And line current depends on trial voltage and tank capacitance, that is:
I=ω C
XU
Examination=2 π fC
XU
ExaminationFormula 2
The utility model is a kind of industrial frequency inductance-regulation resonance pressure-resistant proving installation, its structure as depicted in figs. 1 and 2: comprise testing transformer Regulation Control device (VCB), exciting transformer (ET), constant reactance device (FR), fine setting reactor (FRR), compensation condenser (CC), capacitive divider (CVD).The annexation of each parts is: the alternating current 220V input end of testing transformer Regulation Control device " 3kVA " output termination exciting transformer, output terminal (the 1kV/2kV/4kV of exciting transformer, select one) be connected to and finely tune reactor input end X, fine setting reactor output terminals A is connected to constant reactance device input end X, constant reactance device output terminals A is connected to tested thing, and compensation condenser, capacitive divider are connected in parallel with tested thing respectively; According to the different requirements of tested thing, constant reactance device, compensation condenser select many to carry out parallel connection or be connected in series respectively.
According to concrete content of the test VCB, ET, FR, FRR, CC, CVD are carried out reasonable combination, can satisfy the power frequency withstand test of transformer, generator, motor, high-voltage switch gear, high-tension cable and other relevant devices of 35kV and following high-pressure system.
Described exciting transformer, its capacity are 4kVA.Primary side is the 200V/20A winding, and secondary side winding has 1kV/4A, 2kV/2A, three taps of 4kV/1A, and three taps are selected to connect according to the testing requirements of tested thing.
Described constant reactance device, rated current 1A, maximum output voltage 27kV, its structure is: constant reactance device downside is winding common port X, upside has 70H/1A, 80H/1A, four of 90H/1A, 100H/1A to connect tap respectively, and four taps are selected to connect according to the testing requirements of tested thing.A whole set of industrial frequency inductance-regulation resonance pressure-resistant proving installation disposes 4 constant reactance devices altogether, selects different numbers of elements to carry out parallel connection or is connected in series according to the testing requirements of tested thing.
Described fine setting reactor, its structure is: fine setting reactor downside is winding input end X, and upside is the winding output terminals A, fine setting reactor top design is shaken handle, can electrodeless adjusting fine setting core of reactor gap.A whole set of industrial frequency inductance-regulation resonance pressure-resistant proving installation disposes 2 fine setting reactors altogether, and technical parameter is respectively 4A/5～25H, 2A/20～80H, selects wherein one to be connected in series according to the testing requirements of tested thing.Reactor adopts the mode of electrodeless adjusting in the adjustment of inductance scope, can satisfy different test products and all can produce resonance at the trial.
Described compensation condenser (CC), its structure is: the compensation condenser downside is a low pressure end, upside is a high-pressure side; Package unit disposes 4 compensation condensers altogether, and technical parameter is 80000pF/27kV, selects different numbers of elements to carry out parallel connection or is connected in series according to the testing requirements of tested thing.Four compensation condensers provide capacitance compensation by various combination for tested thing, to reach the resonance purpose.
Described capacitive divider (CVD), its structure is: capacitive divider is divided into two joints up and down, every joint technical parameter is 10000pF/60kV, following joint designs the measurement that 60kV and two interfaces of 120kV are used for trial voltage respectively, when tested thing trial voltage during, only use economize on electricity down to hold voltage divider and the 60kV interface is tested less than 60kV; When tested thing trial voltage during, use two economize on electricitys to hold the voltage dividers series connection and the 120kV interface is tested greater than 60kV.
Capacitive divider provides over-voltage protecting function, provides the overvoltage passive bus to be connected to testing transformer Regulation Control device and starts the loop, and the voltage protection value preestablishes; Two joint voltage divider intrinsic standoff ratios are 1000: 1; Measuring accuracy is 1.5 grades of effective values.
The utility model is described in further detail below in conjunction with accompanying drawing, but do not limit the utility model.
1. testing transformer Regulation Control device
As depicted in figs. 1 and 2: testing transformer Regulation Control device (VCB) is to adopt previous application and the utility model patent (patent No. 2008200662897) that authorized of the applicant; this device mainly is made up of voltage regulator control circuit, pressure regulation holding circuit, timekeeping system; input power supply (AC220V/32A) is introduced by two binding posts (red, black); output has " public " binding post and four function binding posts, is respectively " anti-", " leakage ", " taking shelter from the thunder ", " 3kVA ".When doing the test of power frequency resonance pressure-resistant, select to use " anti-" or " 3kVA " binding post as required; Use " leakage " binding post when doing DC voltage withstand test; Use " taking shelter from the thunder " binding post when doing the lightning arrester test." overcurrent protector " on the panel plays overcurrent protection at the trial, and the protection setting valve can be adjusted according to content of the test.This device has the test clocking capability.
Capacitive divider directly inserts testing transformer Regulation Control device by the special measurement lead with voltage measurement signal, so that trial voltage reading and realization over-voltage protection function." overcurrent protector " on the panel plays overcurrent protection at the trial, and the protection setting valve can be adjusted according to content of the test.This device has the test clocking capability.
As mentioned above, testing transformer Regulation Control device has the withstand voltage and high voltage electric equipment DC break down voltage function of compatible traditional compensator transformer.
2. exciting transformer (ET):
Fig. 3 is an exciting transformer winding connection diagram.Winding of exciting transformer is an alternating current 220V input power supply, and Secondary Winding design output voltage is respectively 1kV/4A, 2kV/2A, 4kV/1A Three Estate, and capacity is 4kVA.
3. constant reactance device (FR): 1A/27KV/100-90-80-70H, four.
Fig. 4 is a constant reactance device structural representation.Every constant reactance utensil has the tap of 100H, 90H, 80H, 70H inductance value, electric current 1A, maximum output voltage 27kV.
4. finely tune reactor (FRR):
Fig. 5 is fine setting reactor structural representation.Two technical parameters of this covering device design are respectively 20～80H/2A, the fine setting reactor of 5～25H/4A.The fine setting reactor adopts the mode of electrodeless adjusting in the adjustment of inductance scope, can satisfy different test products and all can produce resonance at the trial.
5. capacitive divider (CVD):
Fig. 6 is the capacitive divider structural representation.Two different interfaces are set respectively on the capacitive divider base use parameter configuration 120kV/5000Pf for the situation of two kinds of trial voltage grades; Capacitive divider is divided into two joints, and every joint is 60KV/10000pF, when trial voltage during less than 60kV, only uses joint and 60kV interface down; When trial voltage during, use two joints to be connected in series and the 120kV interface greater than 60kV.Equipment provides over-voltage protecting function, provides the overvoltage passive bus to be connected to testing transformer Regulation Control device and starts the loop, and magnitude of voltage can be set; Intrinsic standoff ratio is 1000: 1; Measuring accuracy is 1.5 grades of effective values.
6. compensation condenser (CC)
The compensation condenser parameter configuration is 27kV/80000pF, and four compensation condensers provide capacitance compensation by various combination for tested device, to reach the resonance purpose.
According to formula 1 and formula 2, reactor, compensation condenser are carried out respective combination, can realize the power frequency withstand test of other every test specimens.
With 10kV/300mm
2Cable be example, its voltage withstand class is:
1. 2U
0Be 8.7 * 2=17.4kV (pressure-resistant time 60 minutes)
2. 2.5U
0Be 8.7 * 2.5=21.74kV (pressure-resistant time 5 minutes)
To 10kV/300mm
2Cable, when cable length is 1500m:
Electric capacity 0.56325 μ F, the electric capacity of compensation condenser (containing capacitive divider) is 0.01 μ F, total capacitance 0.57325 μ F when frequency is 50Hz, produces the required inductance value of resonance and is calculated as according to formula 1:
Can calculate test current according to formula 2:
(1) when trial voltage 17.4kV
I=ω C
XU
Examination=2 π fC
XU
Examination=2 * 3.14 * 50 * 0.57325 * 17.4 * 10
-3=3.132A
(2) when trial voltage 21.74kV
I=ω C
XU
Examination=2 π fC
XU
Examination=2 * 3.14 * 50 * 0.57325 * 21.74 * 10
-3=3.913A
According to the calculating of above-mentioned test current, selected 4A/5 ~ 25H finely tunes reactor, can produce the 17.7H inductance value, can satisfy the withstand voltage requirement of 1500m cable industrial frequency resonance.
The test method of industrial frequency inductance-regulation resonance pressure-resistant proving installation:
1) tested device is carried out cleaning, prevent dust, the measurement that influences the tested device electric capacity such as water stain;
2) check the insulation against ground distance of tested device, undesirablely should carry out respective handling;
3) detect the alternate and insulation against ground of tested device, and carry out record; Detection finishes, and tested device is fully discharged;
4) according to the requirement of withstand voltage test, need the point of short circuit to connect tested device, non-ly answered short circuit ground connection by pilot with shorting stub;
5) utilize capacitance meter to measure by pilot total capacitance over the ground;
1) according to measured electric capacity, look into test circuit and connect the corresponding test circuit mode of connection of the table of comparisons 1 selection, notice that the capacitance of actual measurement should be in the relative position intermediate of selected capacitance swing;
6) connect test circuit by selected connected mode;
7) tested device is slowly boosted to 500V～1000V (noting observing electric current), regulate the fine setting reactor, making the indicated voltage of voltage table is maximal value;
8) continue boosted voltage to the trial voltage value, note to observe the demonstration situation of electric current in the process of boosting, if test current surpasses the maximum current of test circuit, illustrate selected line connection not to or measured capacitance value wrong, should stop test, detect again; If no problem picks up counting;
9) test finishes, and progressively reduces trial voltage, cuts off experiment power supply; Utilize discharging rod fully to discharge;
10) detect the alternate and insulation against ground of tested device, and carry out record; Detection finishes, and tested device is fully discharged;
11) remove the temporary line that test connects.
With 10kV/300mm
2Cable is an example, when cable length is 10m, calculate (table look-up or directly measure the test specimen actual capacitance value) according to above-mentioned parameter with capacitance meter, selected with two constant reactance device 80H tap parallel connections, (4A/5 ~ 25H) connect can produce the 58.4H inductance value with the fine setting reactor then; Two compensation condenser series connection carrying out capacitance compensations, testing transformer Regulation Control device uses " 3kVA " binding post, and capacitive divider uses selected parts to select the 60kV jack, and the test connection method is as shown in Figure 2.
After circuit connects; set excess current and overvoltage protection value; the fine setting reactor transfers to minimum (5H); trial voltage slowly is raised to 500V～1kV; utilize the insulation adjuster bar to regulate the fine setting reactor then, make voltage be in maximum value position, this position is the tuning-points of circuit; find the follow-up high voltage of continuing rising of tuning-points to trial voltage (17.4kV/60min or 21.74kV/5min), timing begins.The viewing test electric current shows situation during test, and test period arrives, and slowly reduces voltage, cuts off the electricity supply, to test specimen discharge, off-test.
According to the said equipment configuration, reactor, compensation condenser are carried out respective combination, can realize the power frequency withstand test of other every test specimens, concrete configuration sees Table 1 and table 2.Table 1 and table 2 are not listed the test connection line configuration of 6kV system electrical device (equipment), and test method roughly the same.
Subordinate list
Table 1 test specimen and reactor configuration
Table 2 test specimen and reactor configuration
Claims (7)
1. industrial frequency inductance-regulation resonance pressure-resistant proving installation, it is characterized in that comprising testing transformer Regulation Control device, exciting transformer, the constant reactance device, the fine setting reactor, compensation condenser, capacitive divider, wherein: the alternating current 220V input end of the output termination exciting transformer of testing transformer Regulation Control device, the output terminal of exciting transformer is connected to the input end of fine setting reactor, the output terminal of fine setting reactor is connected to the input end of constant reactance device, the output terminal of constant reactance device is connected to tested thing, compensation condenser, capacitive divider is connected in parallel with tested thing respectively; According to the different needs of tested thing, constant reactance device, compensation condenser select many to carry out parallel connection or be connected in series respectively.
2. industrial frequency inductance-regulation resonance pressure-resistant proving installation according to claim 1, it is characterized in that described exciting transformer, capacity is 4kVA, its structure is: the exciting transformer primary side is the 200V/20A winding, secondary side winding has 1kV/4A, 2kV/2A, three taps of 4kV/1A, and three taps are selected to connect according to the testing requirements of tested thing.
3. industrial frequency inductance-regulation resonance pressure-resistant proving installation according to claim 1, it is characterized in that described constant reactance device, its structure is: constant reactance device downside is winding common port X, upside has 70H/1A, 80H/1A, four of 90H/1A, 100H/1A to connect tap respectively, and four taps are selected to connect according to the testing requirements of tested thing; A whole set of industrial frequency inductance-regulation resonance pressure-resistant proving installation disposes 4 constant reactance devices altogether, selects different numbers of elements to carry out parallel connection or is connected in series according to the testing requirements of tested thing.
4. industrial frequency inductance-regulation resonance pressure-resistant proving installation according to claim 1, it is characterized in that described fine setting reactor, its structure is: fine setting reactor downside is winding input end X, upside is the winding output terminals A, fine setting reactor top design is shaken handle, can electrodeless adjusting finely tune the core of reactor gap; A whole set of industrial frequency inductance-regulation resonance pressure-resistant proving installation disposes 2 fine setting reactors altogether, and technical parameter is respectively 4A/5～25H, 2A/20～80H, selects wherein one to be connected in series according to the testing requirements of tested thing.
5. industrial frequency inductance-regulation resonance pressure-resistant proving installation according to claim 1 is characterized in that described compensation condenser, and its structure is: the compensation condenser downside is a low pressure end, and upside is a high-pressure side; Package unit disposes 4 compensation condensers altogether, and technical parameter is 80000pF/27kV, selects different numbers of elements to carry out parallel connection or is connected in series according to the testing requirements of tested thing.
6. industrial frequency inductance-regulation resonance pressure-resistant proving installation according to claim 1, it is characterized in that described capacitive divider, its structure is: capacitive divider is divided into two joints up and down, every joint technical parameter is 10000pF/60kV, following joint designs the measurement that 60kV and two interfaces of 120kV are used for trial voltage respectively, when tested thing trial voltage during, only use economize on electricity down to hold voltage divider and the 60kV interface is tested less than 60kV; When tested thing trial voltage during, use two economize on electricitys to hold the voltage dividers series connection and the 120kV interface is tested greater than 60kV.
7. industrial frequency inductance-regulation resonance pressure-resistant proving installation according to claim 1, it is characterized in that: capacitive divider provides over-voltage protecting function, provides the overvoltage passive bus to be connected to testing transformer Regulation Control device and starts the loop, and the voltage protection value preestablishes; Two joint voltage divider intrinsic standoff ratios are 1000: 1; Measuring accuracy is 1.5 grades of effective values.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200835212U CN201335872Y (en) | 2009-01-21 | 2009-01-21 | Power-frequency inductance-change resonance voltage-withstanding testing device |
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|---|---|---|---|
| CNU2009200835212U CN201335872Y (en) | 2009-01-21 | 2009-01-21 | Power-frequency inductance-change resonance voltage-withstanding testing device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103207356A (en) * | 2012-11-22 | 2013-07-17 | 山东明华光电科技有限公司 | High-voltage lossless dielectric strength tester |
| CN104155624A (en) * | 2014-07-31 | 2014-11-19 | 国家电网公司 | Boosting calibration equipment used for power frequency resonance test |
| CN104237754A (en) * | 2014-09-26 | 2014-12-24 | 国家电网公司 | Method and device for bridge arm to form equipotential body in converter valve |
| CN104808119A (en) * | 2015-03-31 | 2015-07-29 | 国网宁夏电力公司宁东供电公司 | 10 kV cable AC (alternate current) voltage withstanding test compensating scheme tester |
| CN105353283A (en) * | 2015-11-30 | 2016-02-24 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | AC voltage-withstand test method for 500kV GIL equipment |
| CN105445629A (en) * | 2015-11-30 | 2016-03-30 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | AC voltage withstand test method for 500kV GIS |
| CN106597234A (en) * | 2016-12-09 | 2017-04-26 | 广西电友科技发展有限公司 | Parallel elementary-error compensation power-frequency voltage-withstand test method |
| CN106771911A (en) * | 2016-12-09 | 2017-05-31 | 广西电友科技发展有限公司 | A kind of elementary errors compensation industrial frequency withstand voltage experimental rig in parallel |
| CN109254236A (en) * | 2018-11-14 | 2019-01-22 | 国家电网有限公司 | The field test of frequency conversion resonance vibration pressure-proof experimental rig wideband standard voltage divider and its application method |
| CN109581165A (en) * | 2018-12-28 | 2019-04-05 | 黄江涛 | Novel cable ac voltage withstanding pilot system |
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- 2009-01-21 CN CNU2009200835212U patent/CN201335872Y/en not_active Expired - Fee Related
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| CN103207356A (en) * | 2012-11-22 | 2013-07-17 | 山东明华光电科技有限公司 | High-voltage lossless dielectric strength tester |
| CN104155624A (en) * | 2014-07-31 | 2014-11-19 | 国家电网公司 | Boosting calibration equipment used for power frequency resonance test |
| CN104237754A (en) * | 2014-09-26 | 2014-12-24 | 国家电网公司 | Method and device for bridge arm to form equipotential body in converter valve |
| CN104237754B (en) * | 2014-09-26 | 2017-03-15 | 国家电网公司 | A kind of converter valve bridge arm forms the method and device of equipotential body |
| CN104808119A (en) * | 2015-03-31 | 2015-07-29 | 国网宁夏电力公司宁东供电公司 | 10 kV cable AC (alternate current) voltage withstanding test compensating scheme tester |
| CN105353283A (en) * | 2015-11-30 | 2016-02-24 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | AC voltage-withstand test method for 500kV GIL equipment |
| CN105445629A (en) * | 2015-11-30 | 2016-03-30 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | AC voltage withstand test method for 500kV GIS |
| CN106597234A (en) * | 2016-12-09 | 2017-04-26 | 广西电友科技发展有限公司 | Parallel elementary-error compensation power-frequency voltage-withstand test method |
| CN106771911A (en) * | 2016-12-09 | 2017-05-31 | 广西电友科技发展有限公司 | A kind of elementary errors compensation industrial frequency withstand voltage experimental rig in parallel |
| CN109254236A (en) * | 2018-11-14 | 2019-01-22 | 国家电网有限公司 | The field test of frequency conversion resonance vibration pressure-proof experimental rig wideband standard voltage divider and its application method |
| CN109581165A (en) * | 2018-12-28 | 2019-04-05 | 黄江涛 | Novel cable ac voltage withstanding pilot system |
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Owner name: CHINA FIRST METALLURGICAL CONSTRUCTION GROUP CORPO Free format text: FORMER NAME: CHINA FIRST METALLURGICAL CONSTRUCTION CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 430081 Wuhan Industrial Zone, Qingshan District, Hubei, No. 3 Patentee after: China First Metallurgical Group Co., Ltd. Address before: 430081 Wuhan Industrial Zone, Qingshan District, Hubei, No. 3 Patentee before: China First Metallurgical Construction Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091028 Termination date: 20170121 |
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| CF01 | Termination of patent right due to non-payment of annual fee |