CN111342464B - System and method for checking phases of single-bus system wiring mode unit - Google Patents
System and method for checking phases of single-bus system wiring mode unit Download PDFInfo
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- CN111342464B CN111342464B CN202010318349.5A CN202010318349A CN111342464B CN 111342464 B CN111342464 B CN 111342464B CN 202010318349 A CN202010318349 A CN 202010318349A CN 111342464 B CN111342464 B CN 111342464B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
- G01R25/005—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller, or for passing one of the input signals as output signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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Abstract
The invention discloses a system and a method for nuclear phase of a single bus system wiring mode unit, wherein a high-voltage bus voltage transformer is arranged on a high-voltage bus unit, the high-voltage bus unit is connected with one end of a plant transformer unit and one end of a generator outlet circuit breaker unit through a main transformer interval high-voltage side circuit breaker unit and a main transformer unit, the other end of the generator outlet circuit breaker unit is connected with a closed bus, the generator outlet circuit breaker terminal voltage transformer is arranged on the closed bus, the generator unit is in flexible connection with the closed bus, an excitation transformer is in flexible connection with the closed bus, and a main transformer low-voltage side voltage transformer is arranged on the low-voltage side of the main transformer unit.
Description
Technical Field
The invention belongs to the technical field of electric power debugging and electric power testing, and relates to a system and a method for checking phases of a single-bus system wiring mode unit.
Background
The wiring mode of the single bus system is characterized in that only one group of buses are provided, all power supplies and outgoing lines are connected to the buses through circuit breakers and isolating switches, and the power supply of the single bus system is a generator or a transformer in a power plant and is a transformer or a high-voltage incoming line loop in a transformer substation. A phasing test of a synchronous system of a generator is specifically required in the whole set of starting process by a technical specification DL-T5294-2013 of thermal power generation construction engineering unit debugging, a zero-rise voltage test with a bus is carried out, the polarity of a TV used for synchronization is checked, and a transformer set of the generator is subjected to secondary phase checking with the TV on the system side, so that non-synchronous grid connection of the unit is avoided. However, the wiring mode of the single bus system is only one bus, so that the unit cannot carry out zero-lifting voltage test with the bus after the main transformer reversely transmits power to the station service, and thus, the phasing test cannot be carried out.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for checking the phase of a single bus system wiring mode unit.
In order to achieve the aim, the system for the nuclear phase of the single-bus system wiring mode unit comprises a high-voltage bus voltage transformer, a high-voltage bus unit, a main transformer interval high-voltage side circuit breaker unit, a main transformer unit, a generator outlet circuit breaker unit, a plant transformer unit, a closed bus, an excitation transformer, a generator unit and a plurality of generator outlet circuit breaker terminal voltage transformers;
the high-voltage bus voltage transformer is arranged on a high-voltage bus unit, the high-voltage bus unit is connected with one end of a plant transformer unit and a generator outlet circuit breaker unit through a main transformer interval high-voltage side circuit breaker unit and a main transformer unit, the other side of the generator outlet circuit breaker unit is connected with a closed bus, the generator outlet circuit breaker terminal voltage transformer is arranged on the closed bus, the generator unit is in flexible connection with the closed bus, the excitation transformer is in flexible connection with the closed bus, and the low-voltage side of the main transformer unit is provided with a main transformer low-voltage side voltage transformer.
The main transformer interval high-voltage side circuit breaker unit comprises a main transformer interval circuit breaker bus side grounding disconnecting link, a main transformer interval circuit breaker bus side isolating disconnecting link, a main transformer interval circuit breaker main transformer side grounding disconnecting link, a main transformer interval circuit breaker main transformer side isolating disconnecting link and a main transformer interval circuit breaker.
The generator outlet circuit breaker unit comprises a main transformer side grounding disconnecting link of the generator outlet circuit breaker, a generator side grounding disconnecting link of the generator outlet circuit breaker, an isolation disconnecting link of the generator outlet circuit breaker and the generator outlet circuit breaker.
The invention discloses a phase checking method of a single bus system wiring mode unit, which comprises the following steps:
1) the method comprises the steps that a high-voltage bus unit is powered on, a main transformer unit and a plant transformer unit are powered on, and the amplitude, the phase sequence, the voltage difference and the phase angle difference of secondary voltages of a high-voltage bus voltage transformer and a main transformer low-voltage side voltage transformer are checked;
2) preparing a unit nuclear phase test;
3) disconnecting the flexible connection between the outgoing line of the generator unit and the closed bus and ensuring that a set safety distance exists at a disconnection point;
4) disconnecting the soft connection between the high-voltage side of the excitation transformer and the closed bus and ensuring that a set safety distance exists at a disconnection point;
5) checking and confirming a primary fuse and a secondary fuse of a voltage transformer at the generator outlet breaker end and pushing the primary fuse and the secondary fuse to an operation position;
6) switching on a generator outlet circuit breaker and an energy storage power supply, closing a generator side grounding disconnecting link of the generator outlet circuit breaker, and closing an isolation disconnecting link of the generator outlet circuit breaker;
7) inputting a direct-current control power supply of a unit synchronization device, selecting a synchronization device input instruction in a DCS synchronization control panel, observing whether the pressure difference and frequency difference of the synchronization device indicate zero, judging whether an integral step table indicates a synchronization position, sending out a same-frequency speed increasing signal, then quitting the synchronization device, and measuring a secondary voltage value, a phase sequence and an opening triangular voltage value of a generator outlet circuit breaker terminal voltage transformer; when the detection indication of the pressure difference and the frequency difference of the synchronous device is correct, and the secondary voltage value, the phase sequence and the open triangular voltage value of the generator outlet circuit breaker terminal voltage transformer are correct, turning to the step 9), otherwise, turning to the step 8);
8) disconnecting the generator outlet circuit breaker isolation disconnecting link, disconnecting the generator outlet circuit breaker and the energy storage power supply, closing the generator side grounding disconnecting link of the generator outlet circuit breaker to ensure that the generator outlet circuit breaker unit and a generator outlet circuit breaker terminal voltage transformer lose power, searching and eliminating abnormal defects, and returning to the step 3);
9) disconnecting the generator outlet circuit breaker isolation disconnecting link, disconnecting the generator outlet circuit breaker and the energy storage power supply, and closing the generator side grounding disconnecting link of the generator outlet circuit breaker;
10) restoring the soft connection between the outgoing line of the generator unit and the closed bus, and restoring the soft connection between the excitation transformer and the closed bus;
11) and finishing the phase checking of the single bus system wiring mode unit.
The specific operation of the step 2) is as follows:
the generator outlet circuit breaker is checked and confirmed to be in the switch-off position, the isolation disconnecting link of the generator outlet circuit breaker is in the switch-off position, and the grounding disconnecting link of the generator side of the generator outlet circuit breaker is in the switch-on position.
The invention has the following beneficial effects:
the system and the method for checking the phase of the single bus system wiring mode unit firstly disconnect the soft connection of the generator unit and the excitation transformer and the closed bus to ensure that the generator unit and the excitation transformer can not return power during specific operation, and then adopt the high-voltage bus unit as a voltage source to carry out homologous phase checking on the main transformer low-voltage side voltage transformer and the generator outlet circuit breaker terminal voltage transformer, solve the problem that the single bus wiring system mode unit can not carry out zero-rise voltage test with the bus and synchronous system phasing test after power is received by a plant, can quickly and accurately identify the wiring defect of the voltage transformer, the mounting defect of the common bus and the wiring mode defect of the transformer, and avoid the shaft breakage accident of the generator caused by non-synchronous grid connection, and have higher safety and reliability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the present invention.
Wherein, 1 is a high-voltage bus unit, 2 is a high-voltage bus voltage transformer, 3 is a main transformer interval high-voltage side circuit breaker unit, 4 is a main transformer unit, 5 is a main transformer low-voltage side voltage transformer, 6 is a generator outlet circuit breaker unit, 8 is a closed bus, 10 is an excitation transformer, 7 is a generator outlet circuit breaker terminal voltage transformer, and 9 is a generator unit.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the system for nuclear phase of a single bus system connection mode unit according to the present invention includes a high voltage bus voltage transformer 2, a high voltage bus unit 1, a main transformer interval high voltage side circuit breaker unit 3, a main transformer unit 4, a generator outlet circuit breaker unit 6, a plant transformer unit, a closed bus 8, an excitation transformer 10, a generator unit 9, and a plurality of generator outlet circuit breaker terminal voltage transformers 7; high-voltage bus voltage transformer 2 is installed on high-voltage bus unit 1, high-voltage bus unit 1 is connected with the one end of factory transformer unit and generator export circuit breaker unit 6 through main transformer interval high-voltage side circuit breaker unit 3 and main transformer unit 4, the opposite side of generator export circuit breaker unit 6 is connected with enclosed bus 8, generator export circuit breaker terminal voltage transformer 7 is installed on enclosed bus 8, flexible coupling between generator unit 9 and enclosed bus 8, flexible coupling between excitation transformer 10 and enclosed bus 8, the low-voltage side of main transformer unit 4 is provided with main transformer low-voltage side voltage transformer 5.
The main transformer interval high-voltage side circuit breaker unit 3 comprises a main transformer interval circuit breaker bus side grounding disconnecting link, a main transformer interval circuit breaker bus side isolating disconnecting link, a main transformer interval circuit breaker main transformer side grounding disconnecting link, a main transformer interval circuit breaker main transformer side isolating disconnecting link and a main transformer interval circuit breaker; the generator outlet circuit breaker unit 6 comprises a main transformer side grounding disconnecting link of a generator outlet circuit breaker, a generator side grounding disconnecting link of the generator outlet circuit breaker, an isolation disconnecting link of the generator outlet circuit breaker and the generator outlet circuit breaker.
Referring to fig. 2, the method for checking the phase of the single bus system connection mode unit includes the following steps:
1) the high-voltage bus unit 1 is powered on, the main transformer unit 4 and the plant transformer unit are powered on, the amplitude, phase sequence, voltage difference and phase angle error of the secondary voltage of the high-voltage bus voltage transformer 2 and the main transformer low-voltage side voltage transformer 5 are checked and ensured to be correct, then the high-voltage bus unit 1 is powered by an external circuit, and the secondary voltage is sent to a plant section after being reduced in voltage by the main transformer unit 4 and the plant transformer unit, in order to provide the required factory load when the unit starts, with main become interval circuit breaker generating line side earthing knife-switch in interval high-pressure side circuit breaker unit 3 of main change in the main change be in the off-position, with main become interval circuit breaker generating line side isolation knife-switch in closing the position, with main become interval circuit breaker main change side earthing knife-switch in the off-position, with main become interval circuit breaker main change side isolation knife-switch in closing the position, with main become interval circuit breaker in closing the position, with generator outlet circuit breaker generator side earthing knife-switch of generator outlet circuit breaker unit 6 in the off-position.
2) Preparing a unit nuclear phase test;
3) switching on a generator outlet circuit breaker and an energy storage power supply of a generator outlet circuit breaker unit 6, starting a control power supply of a generator side grounding disconnecting link of the generator outlet circuit breaker unit 6, starting a control power supply of a generator outlet circuit breaker isolating disconnecting link of the generator outlet circuit breaker unit 6, separating the generator side grounding disconnecting link of the generator outlet circuit breaker unit 6, closing the generator outlet circuit breaker isolating disconnecting link of the generator outlet circuit breaker unit 6, closing a generator outlet circuit breaker of the generator outlet circuit breaker unit 6, then switching off the control power supply of the generator side grounding disconnecting link of the generator outlet circuit breaker unit 6, and switching off the control power supply of the generator outlet circuit breaker isolating disconnecting link of the generator outlet circuit breaker unit 6;
4) inputting a direct-current control power supply of a unit synchronization device, selecting a synchronization device input instruction in a DCS synchronization control panel, sending out a same-frequency speed increasing signal after the pressure difference and frequency difference of the synchronization device are zero and the whole-step meter indicates that the synchronization position is reached, and quitting the synchronization device after the inspection is finished;
simultaneously testing the system side voltage and the generator terminal voltage of the synchronous device by using a phase meter, confirming whether the frequency difference of secondary voltage is zero or not, whether the phase angle difference is less than 3 degrees or not, and whether the voltage difference between the same phases is less than 5V or not, measuring the secondary voltage value, the phase sequence and the open triangle voltage value of a generator outlet breaker terminal voltage transformer 7 by using the phase meter, and turning to the step 6) when the detection indication of the voltage difference and the frequency difference of the synchronous device is correct and the secondary voltage value, the phase sequence and the open triangle voltage value of the generator outlet breaker terminal voltage transformer 7 are correct or not, or turning to the step 5);
5) switching on a control power supply of a generator outlet circuit breaker generator side grounding disconnecting link of a generator outlet circuit breaker unit 6, switching on a control power supply of a generator outlet circuit breaker isolating disconnecting link of the generator outlet circuit breaker unit 6, separating a generator outlet circuit breaker isolating disconnecting link of the generator outlet circuit breaker unit 6, closing the generator outlet circuit breaker generator side grounding disconnecting link of the generator outlet circuit breaker unit 6, enabling a generator outlet circuit breaker of the generator outlet circuit breaker unit 6 and a generator outlet circuit breaker terminal voltage transformer 7 to lose power, searching and eliminating abnormal unit defects, and returning to the step 3);
6) the generator outlet circuit breaker of the generator outlet circuit breaker unit 6 is switched on, the control power supply of the generator outlet circuit breaker isolation switch of the generator outlet circuit breaker unit 6 is switched on, the generator outlet circuit breaker of the generator outlet circuit breaker unit 6 is pulled open, the generator side grounding switch of the generator outlet circuit breaker unit 6 is switched on, the generator outlet circuit breaker and the energy storage power supply are disconnected, the control power supply of the generator outlet circuit breaker generator side grounding switch of the generator outlet circuit breaker unit 6 is disconnected, and the control power supply of the generator outlet circuit breaker isolation switch of the generator outlet circuit breaker unit 6 is disconnected.
7) And the soft connection between the outgoing line of the generator unit 9 and the enclosed bus 8 is recovered, and the soft connection between the excitation transformer 10 and the enclosed bus 8 is recovered.
8) And finishing the phase checking of the single bus system wiring mode unit.
The specific operation process of the step 2) is as follows:
201) the generator outlet circuit breaker in the generator outlet circuit breaker unit 6 is in the opening position, the generator outlet circuit breaker isolating switch is in the opening position, and the generator side grounding knife switch of the generator outlet circuit breaker is in the closing position.
202 disconnect the outgoing lines of the generator units 9 from the flexible connection of the enclosed busbar 8 and ensure a sufficient safety distance at the disconnection point.
203) The high voltage side of the field transformer 10 is disconnected from the soft connection of the enclosed busbar 8 and a sufficient safety distance from the disconnection point is ensured.
204) The inspection confirms that the primary and secondary fuses of the generator outlet breaker terminal voltage transformer 7 are intact and have been pushed to the run position.
The invention relates to a phase checking method of a single bus system wiring mode machine set, which can also check the phase of other similar system wiring mode machine sets, such as a quadrangle wiring (no bus system).
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (3)
1. The method for the nuclear phase of the single bus system wiring mode unit is characterized in that based on the single bus system wiring mode unit nuclear phase system, the single bus system wiring mode unit nuclear phase system comprises a high-voltage bus voltage transformer (2), a high-voltage bus unit (1), a main transformer interval high-voltage side circuit breaker unit (3), a main transformer unit (4), a generator outlet circuit breaker unit (6), a plant transformer unit, a closed bus (8), an excitation transformer (10), a generator unit (9) and a plurality of generator outlet circuit breaker terminal voltage transformers (7);
the high-voltage bus voltage transformer (2) is arranged on a high-voltage bus unit (1), the high-voltage bus unit (1) is connected with one end of a plant transformer unit and a generator outlet circuit breaker unit (6) through a main transformer interval high-voltage side circuit breaker unit (3) and a main transformer unit (4), the other side of the generator outlet circuit breaker unit (6) is connected with a closed bus (8), a generator outlet circuit breaker terminal voltage transformer (7) is arranged on the closed bus (8), a generator unit (9) is in flexible connection with the closed bus (8), an excitation transformer (10) is in flexible connection with the closed bus (8), and a main transformer low-voltage side voltage transformer (5) is arranged on the low-voltage side of the main transformer unit (4);
the main transformer interval high-voltage side circuit breaker unit (3) comprises a main transformer interval circuit breaker bus side grounding disconnecting link, a main transformer interval circuit breaker bus side isolating disconnecting link, a main transformer interval circuit breaker main transformer side grounding disconnecting link, a main transformer interval circuit breaker main transformer side isolating disconnecting link and a main transformer interval circuit breaker;
the method comprises the following steps:
1) the method comprises the steps that a high-voltage bus unit (1) is powered on, a main transformer unit (4) and a plant transformer unit are powered on, and the amplitude, the phase sequence, the differential pressure and the phase angle difference of secondary voltages of a high-voltage bus voltage transformer (2) and a main transformer low-voltage side voltage transformer (5) are checked;
2) preparing a unit nuclear phase test;
3) disconnecting the soft connection between the outgoing line of the generator unit (9) and the closed bus (8) and ensuring that a set safety distance exists at a disconnection point;
4) disconnecting the soft connection between the high-voltage side of the excitation transformer (10) and the closed bus (8) and ensuring that a set safety distance exists at a disconnection point;
5) checking and confirming the primary insurance and the secondary insurance of a generator outlet breaker terminal voltage transformer (7) and pushing the transformer to an operation position;
6) switching on a generator outlet circuit breaker and an energy storage power supply, switching on a generator side grounding disconnecting link of the generator outlet circuit breaker, and closing an isolation disconnecting link of the generator outlet circuit breaker;
7) connecting a direct-current control power supply of a unit synchronization device, selecting a synchronization device input instruction in a DCS synchronization control panel, observing whether the pressure difference and frequency difference of the synchronization device indicate zero, judging whether an integral step table indicates a synchronization position, sending out a same-frequency speed increasing signal, then quitting the synchronization device, and measuring a secondary voltage value, a phase sequence and an opening triangular voltage value of a generator outlet circuit breaker terminal voltage transformer (7); when the detection indication of the pressure difference and the frequency difference of the synchronous device is correct, and the secondary voltage value, the phase sequence and the open-delta voltage value of a voltage transformer (7) at the end of the circuit breaker outlet of the generator are correct, turning to the step 9), otherwise, turning to the step 8);
8) disconnecting the generator outlet circuit breaker, disconnecting the generator outlet circuit breaker isolation disconnecting link and the energy storage power supply, closing the generator side grounding disconnecting link of the generator outlet circuit breaker, enabling the generator outlet circuit breaker unit (6) and a generator outlet circuit breaker terminal voltage transformer (7) to lose power, searching and eliminating abnormal defects, and returning to the step 3);
9) disconnecting the generator outlet circuit breaker, disconnecting the isolation disconnecting link and the energy storage power supply of the generator outlet circuit breaker, and closing the generator side grounding disconnecting link of the generator outlet circuit breaker;
10) the soft connection between the outgoing line of the generator unit (9) and the closed bus (8) is recovered, and the soft connection between the excitation transformer (10) and the closed bus (8) is recovered;
11) and finishing the phase checking of the single bus system wiring mode unit.
2. The method for checking the phase of the single bus system wiring mode unit according to claim 1, wherein the specific operation of the step 2) is as follows:
the generator outlet circuit breaker is checked and confirmed to be in the switch-off position, the isolation disconnecting link of the generator outlet circuit breaker is in the switch-off position, and the grounding disconnecting link of the generator side of the generator outlet circuit breaker is in the switch-on position.
3. The method for phasing a single-bus system wiring-mode unit according to claim 1, wherein the generator outlet circuit breaker unit (6) comprises a generator outlet circuit breaker main transformer side grounding switch, a generator outlet circuit breaker generator side grounding switch, a generator outlet circuit breaker isolation switch and a generator outlet circuit breaker.
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| CN111934353B (en) * | 2020-07-03 | 2022-07-05 | 华电电力科学研究院有限公司 | Method for obtaining false synchronization grid-connected signals of unit and optimizing synchronization grid-connected signals |
| CN112134278B (en) * | 2020-09-25 | 2024-04-09 | 龙滩水电开发有限公司龙滩水力发电厂 | Emergency operation method for restarting motor based on fault of generator outlet breaker |
| CN113189411A (en) * | 2021-02-04 | 2021-07-30 | 华能（天津）煤气化发电有限公司 | Phase checking method for synchronous voltage loop of generator set with outlet circuit breaker |
| CN114252710B (en) * | 2021-09-18 | 2023-08-18 | 华电电力科学研究院有限公司 | Method for unit grid-connected synchronous system homologous nuclear phase |
| CN114137328B (en) * | 2021-11-29 | 2023-12-22 | 西安热工研究院有限公司 | Synchronous phasing method based on three-half wiring system |
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| RU2286636C1 (en) * | 2005-07-29 | 2006-10-27 | Государственное образовательное учреждение высшего профессионального образования Томский политехнический университет | Device for selective protection against ground faults in stator winding of generators operating in enlarged unit |
| CN101776735A (en) * | 2009-12-10 | 2010-07-14 | 贵州电力试验研究院 | Generator-transformer unit high-voltage side PT reversed feeding test method |
| US10554149B2 (en) * | 2017-11-20 | 2020-02-04 | Solaredge Technologies Ltd. | Providing positional awareness information and increasing power quality of parallel connected inverters |
| CN108228976B (en) * | 2017-12-14 | 2021-04-16 | 山东电力工程咨询院有限公司 | Modeling method for matching configuration and insulation of lightning arrester of typical power plant |
| CN110007229A (en) * | 2019-04-24 | 2019-07-12 | 南京泰润电力工程有限公司 | A kind of synchronous generator determines phase inspection method |
| CN110504712B (en) * | 2019-08-21 | 2021-08-31 | 西安热工研究院有限公司 | Pi-type homologous nuclear phase system and method for gas power plant |
| CN110514911B (en) * | 2019-08-28 | 2021-08-24 | 西安热工研究院有限公司 | System and method for generating power plant high-voltage bus power supply phase checking |
| CN110854924B (en) * | 2019-11-04 | 2021-03-30 | 中国能源建设集团华东电力试验研究院有限公司 | One-time voltage-on synchronous phase-checking linkage switching inspection system and inspection method for electrical system |
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