CN112234578B - Stator grounding protection method and system by injecting resistance from series connection of arc suppression coils - Google Patents
Stator grounding protection method and system by injecting resistance from series connection of arc suppression coils Download PDFInfo
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- CN112234578B CN112234578B CN202011171831.7A CN202011171831A CN112234578B CN 112234578 B CN112234578 B CN 112234578B CN 202011171831 A CN202011171831 A CN 202011171831A CN 112234578 B CN112234578 B CN 112234578B
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- 230000009471 action Effects 0.000 claims abstract description 14
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- 238000002347 injection Methods 0.000 claims description 27
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
Abstract
The invention discloses a stator grounding protection method and system by connecting resistors in series from arc suppression coils, comprising the following steps: injecting 20Hz voltage signals from two ends of a series resistor of the arc suppression coil on the neutral point side of the generator; the stator grounding protection device carries out impedance compensation calculation by utilizing the measured 20Hz voltage and 20Hz current to obtain the 20Hz voltage and 20Hz current which are actually injected into two ends of a generator stator winding grounding branch, calculates the grounding admittance, takes the reciprocal of the real part of the grounding admittance, and multiplies a resistance conversion coefficient to obtain a grounding fault transition resistance value; and taking the calculated ground fault transition resistance value as a protection criterion, executing an alarm action when the calculated ground fault transition resistance value is lower than a high-section fixed value, and executing a tripping action when the calculated ground fault transition resistance value is lower than a low-section fixed value. The invention can not change the grounding mode of the neutral point of the generator and can accurately calculate the transition resistance value of the ground fault.
Description
Technical Field
The invention belongs to the technical field of design and manufacture of large-scale hydrogenerators and relay protection of main equipment of an electric power system, and particularly relates to a method and a system for injection type stator grounding protection by connecting resistors in series from arc suppression coils.
Background
The stator single-phase earth fault is the most common fault of insulation damage of a stator winding of a large-scale generator, and the damage to the generator is mainly shown as burn of a stator core and enlargement of earth fault into interphase or turn-to-turn short circuit, so that the trend of respectively configuring stator earth protection (a double-frequency type and an injection type) of different principles for a protection A screen/a protection B screen of the generator is already reached.
The injection type stator grounding protection is widely applied to a mode that a generator neutral point is grounded through a power distribution and high impedance (see fig. 1), but is less applied to a mode that a large-scale hydro-generator neutral point is grounded through an arc suppression coil (see fig. 2). Compare in large-scale turbo generator, large-scale hydro generator's rotational speed is lower, and the number of corresponding pole pairs is more to make the stator slot number more, lead to stator winding every relative ground capacitance great, the electric capacity electric current when consequently taking place stator single-phase earth fault is great. Because the capacitance current is larger, the single-phase grounding fault current can be reduced by adopting a mode that a neutral point is grounded through an arc suppression coil. In order to compensate the capacitance current, the inductance value of the arc suppression coil is small, so that the inductance of the arc suppression coil under 20Hz is small, and therefore, a 20Hz signal injected to a neutral point of a generator by a power supply device is small when the injection type stator grounding protection is applied, difficulty is brought to measurement of the signal, and finally the protection application effect is not ideal.
Therefore, there is a need to develop a new stator grounding protection method and system with resistor injection from the arc suppression coil in series
Disclosure of Invention
The invention aims to provide an injection type stator grounding protection method and system for connecting a resistor in series from an arc suppression coil, which can not change the grounding mode of a neutral point of a generator when the injection type stator grounding protection is applied, can effectively improve the size of an injected 20Hz signal and can accurately calculate the grounding fault transition resistance value.
In a first aspect, the injection type stator ground protection method of the series resistor from the arc suppression coil comprises the following steps:
step 1: injecting 20Hz voltage signals from two ends of a series resistor of the arc suppression coil on the neutral point side of the generator; a resistor voltage divider of the stator grounding protection device is connected to two ends of a resistor, and an injected voltage signal is detected through the resistor voltage divider; winding an intermediate current transformer on a power output line, connecting the intermediate current transformer with a stator grounding protection device, detecting an injected current signal through the intermediate current transformer, inputting the current signal into the stator grounding protection device, and obtaining 20Hz voltage and 20Hz current through sampling and filtering;
step 2: the stator grounding protection device carries out impedance compensation calculation by utilizing the measured 20Hz voltage and 20Hz current to obtain the 20Hz voltage and 20Hz current which are actually injected into two ends of a generator stator winding grounding branch, calculates the grounding admittance, takes the reciprocal of the real part of the grounding admittance, and multiplies a resistance conversion coefficient to obtain a grounding fault transition resistance value;
And 3, step 3: and dividing the protection outlet constant value into two sections, namely a high-section constant value and a low-section constant value respectively, by using the calculated ground fault transition resistance value as a protection criterion, executing an alarm action when the calculated ground fault transition resistance value is lower than the high-section constant value, and executing a tripping action when the calculated ground fault transition resistance value is lower than the low-section constant value.
Further, the calculation formula of the ground fault transition resistance value is as follows:
Rg＝KR/Re(Y)
KR＝1/(nCT×nPT)
wherein: semaphore
Is 20Hz current and semaphore measured by stator grounding protection device
Is 20Hz voltage and semaphore measured by stator grounding protection device
Is a 20Hz current flowing through the series resistance of the arc suppression coil,
is the 20Hz voltage drop across the arc suppression coil, the semaphore
Is a 20Hz current after impedance compensation,
is 20Hz voltage, R after impedance compensationL+jXLIs the equivalent impedance of the arc suppression coil under 20Hz，RnIs the resistance value of the series resistor of the arc suppression coil, Re (Y) is the real part of Y, KRIs the coefficient of resistance conversion, nCTIs the transformation ratio of the intermediate current transformer, nPTIs the transformation ratio of the resistor divider, Y is the admittance of the stator winding to ground branch at 20Hz, RgIs the ground fault transition resistance value.
In a second aspect, the invention relates to a series resistance injection type stator grounding protection system from an arc suppression coil, which comprises a stator grounding protection device, a 20Hz injection power supply and an intermediate current transformer.
And two ends of the 20Hz injection power supply are respectively correspondingly connected to two ends of the series resistor 3 of the generator neutral point side arc suppression coil 1, and the 20Hz injection power supply is used for injecting 20Hz voltage signals from two ends of the series resistor 3 of the generator neutral point side arc suppression coil 1.
And a resistor voltage divider of the stator grounding protection device is connected to two ends of the resistor 3, and the injected voltage signal is detected through the resistor voltage divider.
The middle current transformer is wound on a power output line, is connected with the stator grounding protection device, and detects an injected current signal through the middle current transformer and inputs the current signal to the stator grounding protection device.
The stator grounding protection device performs impedance compensation calculation by using the measured 20Hz voltage and 20Hz current to obtain the 20Hz voltage and 20Hz current actually injected to two ends of a generator stator winding grounding branch, calculates the grounding admittance, takes the reciprocal of the real part of the grounding admittance, and multiplies a resistance conversion coefficient to obtain a grounding fault transition resistance value; and dividing the protection outlet constant value into two sections, namely a high-section constant value and a low-section constant value respectively, by using the calculated ground fault transition resistance value as a protection criterion, executing an alarm action when the calculated ground fault transition resistance value is lower than the high-section constant value, and executing a tripping action when the calculated ground fault transition resistance value is lower than the low-section constant value.
The invention has the beneficial effects that:
(1) the grounding mode of the neutral point of the generator is not changed when the injection type stator grounding protection is applied;
(2) the protection scheme is easy to implement;
(3) the magnitude of the injected 20Hz signal can be effectively improved, the signal measurement condition is improved, and the ground fault transition resistance value can be accurately calculated.
Drawings
Fig. 1 is a schematic diagram of an implementation scheme of injection type stator ground protection under a high-resistance grounding mode of a power distribution transformer of a conventional large-scale hydraulic generator;
FIG. 2 is a schematic diagram of a prior large-scale hydraulic generator with a neutral point grounded through an arc suppression coil;
FIG. 3 is a schematic diagram of signals injected from the arc suppression coils in series connection with the resistors in the grounding mode of the arc suppression coils of the large-scale hydraulic generator in the embodiment;
FIG. 4 is a 20Hz equivalent circuit diagram of the signal injected from the series-connected resistor of the arc suppression coil in the grounding mode of the arc suppression coil of the large hydraulic generator in this embodiment;
in the figure: 1. arc suppression coil, 2, instrument coil, 3, resistance, 4, stator ground protection device, 5, 20Hz injection power supply, 6, isolator, 7, middle current transformer.
Detailed Description
The present embodiment will be described in detail below with reference to the accompanying drawings.
In the embodiment, on the premise of not changing the neutral point side grounding mode of a large-scale hydraulic generator (so as to reduce the difficulty of motor design and manufacture), the injection type stator grounding protection 20Hz signal injection is realized by connecting the arc suppression coil 1 with the resistor 3 in series (for suppressing transmission overvoltage). The method specifically comprises the following steps:
Step 1: injecting a 20Hz voltage signal from two ends of a resistor 3 connected in series with the arc suppression coil 1 on the neutral point side of the generator; a resistor voltage divider of the stator grounding protection device 4 is connected to two ends of the resistor 3, and the injected voltage signal is detected through the resistor voltage divider (see fig. 3); winding an intermediate current transformer 7 on a power output line, connecting the intermediate current transformer 7 with the stator grounding protection device 4, detecting an injected current signal through the intermediate current transformer 7 and inputting the current signal to the stator grounding protection device 4 (see figure 3), and obtaining 20Hz voltage and 20Hz current through sampling and filtering; .
Step 2: the stator ground protection device 4 performs impedance compensation calculation by using the measured 20Hz voltage and 20Hz current to obtain the 20Hz voltage and 20Hz current (see fig. 4) actually injected into the two ends of the generator stator winding ground branch, calculates the ground admittance, takes the reciprocal of the real part of the ground admittance, and multiplies the resistance conversion coefficient to obtain the ground fault transition resistance value, wherein the calculation formula of the ground fault transition resistance value is as follows:
Rg＝KR/Re(Y) (6)
KR＝1/(nCT×nPT) (7)
wherein: semaphore
Is 20Hz current and semaphore measured by a stator grounding protection device
Is 20Hz voltage and semaphore measured by a stator grounding protection device
Is 20Hz current flowing through the series resistor of the arc suppression coil, 
Is the 20Hz voltage drop across the arc suppression coil, the semaphore
Is a 20Hz current after impedance compensation,
is a 20Hz voltage after impedance compensation. Among the impedance compensation parameters, RL+jXLIs the equivalent impedance, R, of the arc suppression coil 1 at 20HznIs the resistance value of the series resistor of the arc suppression coil, Re (Y) is the real part of Y, KRIs the coefficient of resistance conversion, nCTIs the transformation ratio of the intermediate current transformer, nPTThe value of the compensation parameter is obtained in advance through field measurement experiments. Y is the admittance of the stator winding to ground branch at 20Hz, RgIs the ground fault transition resistance value.
And step 3: and dividing the protection outlet constant value into two sections, namely a high-section constant value and a low-section constant value, by using the calculated ground fault transition resistance value as a protection criterion, executing an alarm action when the calculated ground fault transition resistance value is lower than the high-section constant value, and executing a trip action when the calculated ground fault transition resistance value is lower than the low-section constant value.
As shown in fig. 3, in the present embodiment, the arc suppression coil 1 is a reactor capable of changing inductance value, and has a structural feature of having an auxiliary winding (i.e., an instrument coil 2) for measuring the fundamental zero-sequence voltage. The tap of the arc suppression coil 1 is connected with an isolating switch 6.
The method of the present embodiment will be described below by taking a generator of a certain hydropower station as an example, and the basic parameters of the generator are shown in table 1.
TABLE 1 certain hydropower station Generator parameters
A 20Hz injection power supply 5 is connected with a resistor 3 (namely a resistor R) connected in series with the arc suppression coil 1n) Two ends of the resistor are connected with the resistor divider, and the middle current transformer 7 is wound on the power output line. And a voltage signal measured by the resistor divider and a current signal measured by the intermediate current transformer 7 are respectively sent to corresponding ports of the stator grounding protection device 4, wherein the transformation ratio of the resistor divider is 1/3, and the transformation ratio of the intermediate current transformer 7 is 10A/1A.
The single-phase earth fault of the stator is simulated, actual measurement is carried out by using the stator earth protection device 4, and the result is shown in table 2:
table 2 simulation results
The result shows that the mode of injecting 20Hz voltage signals into the resistor 3 connected in series through the arc suppression coil 1 and a corresponding protection algorithm are adopted, the transition resistance value of the ground fault can be accurately calculated, and therefore the application of injection type stator ground protection in the mode of grounding the arc suppression coil 1 is realized.
In the embodiment, the injection type stator grounding protection system with the resistors connected in series from the arc suppression coil comprises a stator grounding protection device 4, a 20Hz injection power supply 5 and an intermediate current transformer 7.
Two ends of the 20Hz injection power supply 5 are respectively correspondingly connected to two ends of the series resistor 3 of the generator neutral point side arc suppression coil 1, and the 20Hz injection power supply 5 is used for injecting 20Hz voltage signals from two ends of the series resistor 3 of the generator neutral point side arc suppression coil 1.
And a resistor voltage divider of the stator grounding protection device 4 is connected to two ends of the resistor 3, and the injected voltage signal is detected through the resistor voltage divider.
The intermediate current transformer 7 is wound on a power output line, the intermediate current transformer 7 is connected with the stator grounding protection device 4, and an injected current signal is detected through the intermediate current transformer 7 and input to the stator grounding protection device 4.
The stator grounding protection device 4 performs impedance compensation calculation by using the measured 20Hz voltage and 20Hz current to obtain the 20Hz voltage and 20Hz current actually injected to two ends of the generator stator winding grounding branch, calculates the grounding admittance, and obtains the reciprocal of the real part of the grounding admittance, and then multiplies the resistance conversion coefficient to obtain the grounding fault transition resistance value; and dividing the protection outlet constant value into two sections, namely a high-section constant value and a low-section constant value respectively, by using the calculated ground fault transition resistance value as a protection criterion, executing an alarm action when the calculated ground fault transition resistance value is lower than the high-section constant value, and executing a tripping action when the calculated ground fault transition resistance value is lower than the low-section constant value.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (2)
1. A stator grounding protection method of connecting a resistor in series from an arc suppression coil is characterized by comprising the following steps:
step 1: injecting a 20Hz voltage signal from two ends of a resistor (3) connected in series with the arc suppression coil (1) on the neutral point side of the generator; a resistor voltage divider of the stator grounding protection device (4) is connected to two ends of the resistor (3), and the injected voltage signal is detected through the resistor voltage divider; winding an intermediate current transformer (7) on a power output line, connecting the intermediate current transformer (7) with the stator grounding protection device (4), detecting an injected current signal through the intermediate current transformer (7), inputting the current signal to the stator grounding protection device (4), and obtaining 20Hz voltage and 20Hz current through sampling and filtering;
step 2: the stator grounding protection device (4) performs impedance compensation calculation by using the measured 20Hz voltage and 20Hz current to obtain the 20Hz voltage and 20Hz current which are actually injected into two ends of a generator stator winding grounding branch, calculates the grounding admittance, takes the reciprocal of the real part of the grounding admittance, and multiplies a resistance conversion coefficient to obtain a grounding fault transition resistance value;
And 3, step 3: dividing a protection outlet constant value into two sections, namely a high-section constant value and a low-section constant value respectively, by using the calculated ground fault transition resistance value as a protection criterion, executing an alarm action when the calculated ground fault transition resistance value is lower than the high-section constant value, and executing a tripping action when the calculated ground fault transition resistance value is lower than the low-section constant value;
the calculation formula of the ground fault transition resistance value is as follows:
Rg＝KR/Re(Y)
KR＝1/(nCT×nPT)
wherein: semaphore
Is 20Hz current and semaphore measured by stator grounding protection device
Is 20Hz voltage and semaphore measured by stator grounding protection device
Is a 20Hz current flowing through the series resistance of the arc suppression coil,
is the 20Hz voltage drop across the arc suppression coil, the semaphore
Is a 20Hz current after impedance compensation,
is 20Hz voltage, R after impedance compensationL+jXLIs the equivalent impedance of the arc suppression coil at 20Hz, RnIs the resistance value of the series resistor of the arc suppression coil, Re (Y) is the real part of Y, KRIs the coefficient of resistance conversion, nCTIs the transformation ratio of the intermediate current transformer, nPTIs the transformation ratio of the resistor divider, Y is the admittance of the stator winding to ground branch at 20Hz, RgIs the ground fault transition resistance value.
2. The utility model provides a connect resistance injection type stator ground protection system from arc suppression coil in series which characterized in that: the device comprises a stator grounding protection device (4), a 20Hz injection power supply (5) and an intermediate current transformer (7);
Two ends of the 20Hz injection power supply (5) are correspondingly connected to two ends of the series resistor (3) of the neutral point side arc suppression coil (1) of the generator respectively, and the 20Hz injection power supply (5) is used for injecting 20Hz voltage signals from two ends of the series resistor (3) of the neutral point side arc suppression coil (1) of the generator;
a resistor voltage divider of the stator grounding protection device (4) is connected to two ends of the resistor (3), and the injected voltage signal is detected through the resistor voltage divider;
the middle current transformer (7) is wound on a power output line, the middle current transformer (7) is connected with the stator grounding protection device (4), and an injected current signal is detected through the middle current transformer (7) and input to the stator grounding protection device (4);
the stator grounding protection device (4) performs impedance compensation calculation by using the measured 20Hz voltage and 20Hz current to obtain the 20Hz voltage and 20Hz current which are actually injected into two ends of a generator stator winding grounding branch, calculates the grounding admittance, takes the reciprocal of the real part of the grounding admittance, and multiplies the resistance conversion coefficient to obtain the grounding fault transition resistance value; dividing a protection outlet constant value into two sections, namely a high-section constant value and a low-section constant value, by using the calculated ground fault transition resistance value as a protection criterion, executing an alarm action when the calculated ground fault transition resistance value is lower than the high-section constant value, and executing a trip action when the calculated ground fault transition resistance value is lower than the low-section constant value;
The calculation formula of the ground fault transition resistance value is as follows:
Rg＝KR/Re(Y)
KR＝1/(nCT×nPT)
wherein: semaphore
Is 20Hz current and semaphore measured by a stator grounding protection device
Is 20Hz voltage and semaphore measured by a stator grounding protection device
Is 20Hz current flowing through the series resistor of the arc suppression coil,
is the 20Hz voltage drop across the arc suppression coil, the semaphore
Is a 20Hz current after impedance compensation,
is 20Hz voltage, R after impedance compensationL+jXLIs the equivalent impedance of the arc suppression coil at 20Hz, RnIs the resistance value of the series resistor of the arc suppression coil, Re (Y) is the real part of Y, KRIs the coefficient of resistance conversion, nCTIs the transformation ratio of the intermediate current transformer, nPTIs the transformation ratio of the resistor divider, Y is the admittance of the stator winding to ground branch at 20Hz, RgIs the ground fault transition resistance value.
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| CN114498558B (en) * | 2022-01-12 | 2023-10-24 | 中国长江电力股份有限公司 | Generator stator grounding resistance segmentation algorithm based on 20Hz current-voltage phase difference |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1595751A (en) * | 2000-03-30 | 2005-03-16 | 华中科技大学 | Grounding protection method for stator of power generator with neutral point grounded via arc suppression coil |
| CN101414744A (en) * | 2008-06-24 | 2009-04-22 | 清华大学 | Grounding protection method for stator of dual-frequency injection type power generator |
| CN104917148A (en) * | 2014-03-12 | 2015-09-16 | 南京南瑞继保电气有限公司 | Generator injection type stator grounding protection method and protection device |
| CN105322528A (en) * | 2014-06-30 | 2016-02-10 | 中国石油大学(华东) | Injection current two-point calculation method during small-current grounding fault active arc extinguishing |
| DE102015221725A1 (en) * | 2015-11-05 | 2017-05-11 | Robert Bosch Gmbh | Method for monitoring an electrical system |
| CN109888732A (en) * | 2018-01-09 | 2019-06-14 | 广东电网有限责任公司电力调度控制中心 | A kind of generator stator ground load inverse time-lag protection method based on earth-fault current |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008042975A1 (en) * | 2008-10-20 | 2010-04-22 | Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg | Electrical machine i.e. direct current motor, for use in steering drive device of motor vehicle, has coils and coil sections connected with each other in electrical series connection, and coil group formed from coil sections |
| CN104218526B (en) * | 2013-05-30 | 2017-10-13 | 南京南瑞继保电气有限公司 | Using the generator injected type stator ground protection method of segmentation phase angle compensation |
| EP3092502A1 (en) * | 2014-01-08 | 2016-11-16 | Electricité de France | Electrical measuring device for measuring the resistance of an earth connection of an electrical facility |
| CN108490304B (en) * | 2018-03-22 | 2020-08-11 | 华能集团技术创新中心有限公司 | Method for positioning single-phase earth fault position of generator stator winding |
| CN110336265A (en) * | 2019-06-17 | 2019-10-15 | 赵子云 | Medium voltage network neutral point arc suppression coil and resistance combination earthing method |
-
2020
- 2020-10-28 CN CN202011171831.7A patent/CN112234578B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1595751A (en) * | 2000-03-30 | 2005-03-16 | 华中科技大学 | Grounding protection method for stator of power generator with neutral point grounded via arc suppression coil |
| CN101414744A (en) * | 2008-06-24 | 2009-04-22 | 清华大学 | Grounding protection method for stator of dual-frequency injection type power generator |
| CN104917148A (en) * | 2014-03-12 | 2015-09-16 | 南京南瑞继保电气有限公司 | Generator injection type stator grounding protection method and protection device |
| CN105322528A (en) * | 2014-06-30 | 2016-02-10 | 中国石油大学(华东) | Injection current two-point calculation method during small-current grounding fault active arc extinguishing |
| DE102015221725A1 (en) * | 2015-11-05 | 2017-05-11 | Robert Bosch Gmbh | Method for monitoring an electrical system |
| CN109888732A (en) * | 2018-01-09 | 2019-06-14 | 广东电网有限责任公司电力调度控制中心 | A kind of generator stator ground load inverse time-lag protection method based on earth-fault current |
Non-Patent Citations (2)
| Title |
|---|
| On-line Resonance Measurement of Generator Stator Insulation Considering Damping Coefficient of Arc Suppression Coil;Linbo Xu 等;《Preprints of the 3rd IEEE conference on Energy Internet and Energy System Integration》;Preprints of the 3rd IEEE conference on Energy Internet and Energy System Integration;20200409;第806-810页 * |
| 消弧线圈接地方式下外加20Hz电源定子接地保护的应用;毕大强 等;《电力系统自动化》;电力系统自动化;20050225;第29卷(第4期);第82-84页 * |
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Effective date of registration: 20231124 Address after: 562400 No.1 Beijing Road, Xingyi City, Qianxinan Buyi and Miao Autonomous Prefecture, Guizhou Province Patentee after: TIANSHENGQIAO HYDROPOWER GENERATION Co.,Ltd. Patentee after: Southern Power Grid Energy Storage Co.,Ltd. Western Maintenance and Testing Branch Address before: 562400 No.1, Beijing Road, Xingyi City, Guizhou Province Patentee before: TIANSHENGQIAO HYDROPOWER GENERATION Co.,Ltd. Patentee before: China Southern power grid peak load regulation and frequency modulation power generation Co.,Ltd. Western maintenance test branch |