CN108089144A - Electronic current mutual inductor field calibration system and method - Google Patents
Electronic current mutual inductor field calibration system and method Download PDFInfo
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- CN108089144A CN108089144A CN201810122314.7A CN201810122314A CN108089144A CN 108089144 A CN108089144 A CN 108089144A CN 201810122314 A CN201810122314 A CN 201810122314A CN 108089144 A CN108089144 A CN 108089144A
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- mutual inductor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Power Engineering (AREA)
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The present invention provides a kind of electronic current mutual inductor field calibration systems and method, system to include：The single bus scheme for the electronic current mutual inductor that standard current transformer, current lifting device, calibration equipment and access are tested；Wherein, in single bus scheme, the three-phase of the two adjacent spaces electronic current mutual inductor that respectively connection one is tested, and two phase terminals (201) and terminal (204) that two adjacent spaces are closed on are respectively connected to current lifting device and standard current transformer, in the other two-phase at interval, terminal (202) is connected with terminal (203), and terminal (205) is connected with terminal (206).The present invention solves the problems, such as that testing process is cumbersome in current intelligent substation electronic current mutual inductor field-checking, improves the field-checking efficiency of electronic current mutual inductor.
Description
Technical field
The present invention relates to power technologies, are concretely a kind of electronic current mutual inductor field calibration system and method.
Background technology
With the continuous development of intelligent grid and intelligent substation key technology, China's intelligent substation welcomes explosion type increasing
Long, smart machine quantity is also more and more in intelligent substation.For mutual inductor in substation, needed before putting into operation to its into
Row field-checking, and the field-checking of the electronic mutual inductor come for intelligent substation, the electromagnetic type than traditional substation are mutual
Sensor field-checking is more complicated, and required time is more.The field-checking of mutual inductor, which needs to have a power failure, to carry out, and period cannot be into
Row cross-operation.Therefore, improve intelligent substation electronic mutual inductor field-checking work efficiency to the construction of intelligent substation,
Put into operation, overhaul it is all significant.
In the prior art, national grid company standard Q/GDW 690-2011《Electronic mutual inductor field-checking specification》In
The electronic current mutual inductor verification wiring diagram provided is as shown in Figure 1, using transducer check scheme shown in FIG. 1, every time only
Field-checking can be carried out to an electronic current mutual inductor, per one electronic current mutual inductor of field-checking, both need to tear open
Connect a p-wire, it is also necessary to disconnect second test line, while also testing equipment and auxiliary are moved according to the position of test item
Equipment.
The content of the invention
In order to promote the field-checking efficiency of electronic current mutual inductor, an embodiment of the present invention provides a kind of electronic type electricity
Current transformer field calibration system, including：Standard current transformer, current lifting device, calibration equipment and the electricity for accessing subject
The single bus scheme of type current transformer；Wherein,
In single bus scheme, the three-phase electronic current mutual inductor that respectively connection one is tested of two adjacent spaces, and two-phase
Neighbour's two phase terminals (201) for closing on of interval and terminal (204) are respectively connected to current lifting device and standard current transformer, interval it is another
In outer two-phase, terminal (202) is connected with terminal (203), and terminal (205) is connected with terminal (206).
In the embodiment of the present invention, combining unit output optical fibre connects verifying attachment input terminal, and terminal connects during combining unit pair
Calibration equipment synchronous signal output end.
In the embodiment of the present invention, combining unit output optical fibre connects verifying attachment input terminal, during combining unit pair terminal with
Signal when calibration equipment synchronous signal input end accesses whole station pair simultaneously.
In the embodiment of the present invention, the electronic current mutual inductor check system further includes：Pressure regulator；
The output terminal of the pressure regulator is connected with the input terminal of current lifting device.
It is mutual using foregoing electronic current meanwhile invention additionally discloses a kind of electronic current mutual inductor method of calibration
Sensor check system verifies the electronic current mutual inductor of subject, and method includes：
Breaker, the disconnecting switch at adjacent two interval of access subject electronic current transducer are closed, is disconnected between other outlets
Every breaker, disconnecting switch；
Subject electronic current transducer in single bus scheme shape form is connected in series in checking circuit；
The corresponding combining unit in each interval is connected with calibration equipment, call through test voltage adjusts pressure regulator, to each interval
The subject electronic current mutual inductor of access is verified.
Meanwhile the present invention also provides a kind of electronic current mutual inductor field calibration system, including：Normalized current mutual inductance
Device, current lifting device, calibration equipment and the double bus scheme for accessing the electronic current mutual inductor of subject；Wherein,
In double bus scheme, the three-phase electronic current mutual inductor that respectively connection one is tested of two adjacent spaces, and it is described
Two phase terminals (401) and terminal (404) that two adjacent spaces are closed on are respectively connected to current lifting device and standard current transformer, interval
Other two-phase in, terminal (402) is connected with terminal (403), and terminal (405) is connected with terminal (406).
It is mutual using foregoing electronic current meanwhile the present invention also provides a kind of electronic current mutual inductor method of calibration
Sensor check system verifies the electronic current mutual inductor of subject, and method includes：
It is closed the disconnecting switch for accessing two intervals for being tested electronic current mutual inductor and mother interval, breaker and makes
Two interval is connected with two busbares, simultaneously switches off disconnecting switch, the mutual inductor of other outgoing line intervals；
It will be in the electronic current mutual inductor series connection access checking circuit for the subject that accessed with double-bus；
The corresponding combining unit in each interval is connected with calibration equipment, call through test voltage adjusts pressure regulator to each interval
The subject electronic current mutual inductor of access is verified.
The present invention solves in current intelligent substation electronic current mutual inductor field-checking that testing process is cumbersome to ask
Topic overcomes the prior art to need continuous one one and disconnects a p-wire, second test line and move testing equipment repeatedly
And ancillary equipment.The present invention can reach reduction and repeat connection times, reduce boosting/up-flow number, reduce experimental facilities repeatedly
It moves while realizes that efficient multiple error paths to more mutual inductors are verified, examine and determine a little automatic judgement identification.
Above and other objects, features and advantages to allow the present invention can be clearer and more comprehensible, preferred embodiment cited below particularly,
And coordinate institute's accompanying drawings, it is described in detail below.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 verifies wiring diagram for electronic current mutual inductor in the prior art；
Fig. 2 is electronic current mutual inductor check system block diagram disclosed by the invention；
Fig. 3 is the flow chart of electronic current mutual inductor method of calibration disclosed by the invention；
Fig. 4 is electronic current mutual inductor check system block diagram disclosed by the invention；
Fig. 5 is the flow chart of electronic current mutual inductor method of calibration disclosed by the invention；
Fig. 6 is the schematic diagram of one embodiment of the invention；
Fig. 7 is the schematic diagram of one embodiment of the invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment belongs to the scope of protection of the invention.
An embodiment of the present invention provides a kind of electronic current mutual inductor field calibration system, as shown in Fig. 2, including：Mark
The single busbar for the electronic current mutual inductor that quasi- current transformer 101, current lifting device 102, calibration equipment 103 and access are tested connects
Line；Wherein,
In single bus scheme, the three-phase electronic current mutual inductor that respectively connection one is tested of two adjacent spaces 10,11, and
Two phase terminals 201 and terminal 204 that two adjacent spaces are closed on are respectively connected to current lifting device 102 and standard current transformer 101,
Every other two-phase in, terminal 202 is connected with terminal 203, and terminal 205 is connected with terminal 206, standard current transformer
The secondary simulation input terminal of 101 2 output termination calibration equipments.
In the embodiment of the present invention, combining unit output optical fibre connects 103 input terminal of verifying attachment, terminal during combining unit pair
Connect calibration equipment synchronous signal output end；Alternatively,
Combining unit output optical fibre connects verifying attachment input terminal, terminal and calibration equipment synchronizing signal during combining unit pair
Signal when input terminal accesses whole station pair simultaneously.
It is mutual using foregoing electronic current meanwhile the present invention also provides a kind of electronic current mutual inductor method of calibration
Sensor check system verifies the electronic current mutual inductor of subject, as shown in figure 3, including：
Step S301 is closed breaker, the disconnecting switch at adjacent two interval of access subject electronic current transducer, disconnects it
The breaker of his outgoing line interval, disconnecting switch；
Subject electronic current transducer in single bus scheme shape form is connected in series in checking circuit by step S302；
The corresponding combining unit in each interval is connected by step S303 with calibration equipment, and call through test voltage adjusts pressure regulation
Device verifies the subject electronic current mutual inductor of each interval access.
Meanwhile the present invention also provides a kind of electronic current mutual inductor field calibration system, to the electricity in double bus scheme
Type current transformer is verified, as shown in figure 4, the system includes：Standard current transformer 101, current lifting device 102, verification
Device 103 and the double bus scheme for accessing the electronic current mutual inductor of subject；
In double bus scheme, the three-phase electronic current mutual inductor that respectively connection one is tested of two adjacent spaces 41,42, and
Two phase terminals 401 and terminal 404 that two adjacent spaces are closed on are respectively connected to current lifting device and standard current transformer, interval it is another
In outer two-phase, terminal 402 is connected with terminal 403, and terminal 405 is connected with terminal 406.
It is mutual using foregoing electronic current meanwhile the present invention also provides a kind of electronic current mutual inductor method of calibration
Sensor check system verifies the electronic current mutual inductor of subject, as shown in figure 5, method includes：
Step S501, two intervals of closure access subject electronic current mutual inductor and the disconnecting switch at mother interval,
Breaker simultaneously makes two interval be connected with two busbares, simultaneously switches off disconnecting switch, the mutual inductor of other outgoing line intervals；
Step S502, will be in the electronic current mutual inductor series connection access checking circuit for the subject that accessed with double-bus；
The corresponding combining unit in each interval is connected by step S503 with calibration equipment, and call through test voltage adjusts pressure regulator
The subject electronic current mutual inductor of each interval access is verified.
By technical scheme, solves the electronics of current intelligent substation single busbar/double bus scheme form
The problem of testing process is cumbersome during formula current transformer verifies at the scene, overcome needs continuous one one to tear open in the prior art
The problem of connecing a p-wire, second test line and moving testing equipment and ancillary equipment repeatedly repeats to connect so as to reach to reduce
Line number reduces boosting/up-flow number, reduces moving while leading to multiple errors of more mutual inductors repeatedly for experimental facilities
Road is verified, examines and determine a little high efficiency field-checking such as automatic judgement identification.With reference to specific embodiment to the present invention
Technical solution be described in further details.
Efficiently testing scheme is as follows at single bus scheme form electronic current mutual inductor scene in the embodiment of the present invention：
Single bus scheme form is widely used in the electrical primary main electrical scheme of electric system, is common in 500kV substations
The advantages of low-pressure side and 220kV substations medium voltage side etc., single bus scheme be it is simple in structure, clear, easy to operate, breaker and
It may be readily formed as interlocking between disconnecting switch, effectively prevent misoperation fault, few in addition with primary equipment is used, operating cost is low
The features such as.
In order to improve the efficiency of single bus scheme form electronic current mutual inductor on-the-spot test, the schematic diagram of the present embodiment
As indicated with 6.
In the present embodiment, high-voltage switch electric appliance operation：It is closed disconnecting switch, the breaker of the adjacent spaces that will be tested；
Disconnect interval switch, the breaker of other outgoing line intervals；
Primary connection：As shown in the figure, adjacent two 601,602 distal end two-phases of interval are each connected, such as 1., 4.；Between two
Current lifting device and standard current transformer are respectively connected to every closing on mutually to draw, such as 2., 3.；Output voltage regulator connects current lifting device input
End；Current lifting device, subject electronic current mutual inductor, standard current transformer series connection；
Secondary connection：Secondary output S1, the S2 of standard current transformer connects the secondary simulation input terminal of calibration equipment；Merge single
First output optical fibre connects calibration equipment DATA IN terminal；Terminal connects calibration equipment and connects calibration equipment synchronizing signal during combining unit pair
Signal when leading-out terminal or combining unit access whole station pair simultaneously with calibration equipment synchronous signal input end.
Field-checking process：
1. carry out high-voltage switch electric appliance operation, primary current wiring, secondary connection according to above-mentioned requirements；
2. the corresponding combining unit in 601 intervals is connected with calibration equipment, call through test voltage adjusts pressure regulator, 601
It is verified simultaneously every 3 phase, 3 electronic current mutual inductors, records pressure regulator zero, power-off after verification data；
3. the corresponding combining unit in 602 intervals is connected with calibration equipment, call through test voltage, pressure regulator, 602 intervals are adjusted
3 electronic current mutual inductors of phase 3 verify simultaneously, record pressure regulator zero, power-off after verification data；
4. tearing primary line, secondary line open, recover the original position of high-voltage switch electric appliance.
It is right to this 6 electronic current mutual inductors equipped with the configuration of " A sets+B sets " combining unit in traditional checkschema
In terms of this 12 grouping error data, experimental facilities, pressure regulator 1, current lifting device 1, standard current transformer 1, school are needed altogether
Test a set of equipment, 2, a high current line, 2, second test line, optical fiber 2；In terms of experiment process, at least need once to connect
Line 6 times, secondary connection 12 times, flow up 12 times, and constantly moving with equipment.
And scheme disclosed in the present embodiment is used, in terms of experimental facilities, pressure regulator 1, current lifting device 1, standard are needed altogether
Current transformer 1, calibration equipment are a set of, 4, a high current line, 2, second test line, optical fiber 2, are only verified than tradition
Scheme increases by 2 high current lines；In terms of experiment process, if calibration equipment is only capable of connecing a combining unit, experiment only needs once
Wiring once, secondary connection 1 time, up-flow 4 times, and period equipment is not required move.If calibration equipment can connect more
Combining unit can simultaneously verify simultaneously, and number can also be reduced in terms of number is flowed up, if can connect 2 merging during calibration equipment
Unit then flows up number and is decreased to 2 times, if can connect 4 combining units during calibration equipment, flows up number and is decreased to 1 time, i.e.,
Primary connection can be realized to 1 up-flow complete verification of the corresponding 12 grouping error parameter of 6 electronic current mutual inductors.
In the embodiment of the present invention, the efficient testing scheme in double bus scheme form electronic current mutual inductor scene：
Double bus scheme form is widely used in the electrical primary main electrical scheme of electric system, is common in 500kV substations
The advantages of medium voltage side and 220kV substations high-pressure side etc., double bus scheme be any group of busbar of maintenance will not interruption of power supply, it is any
When circuit breaker overhauls, the advantages that work can be replaced with busbar breaker.
In order to improve the efficiency of double bus scheme form electronic current mutual inductor on-the-spot test, the efficient test side of invention
Case principle is as shown in Figure 7.
High-voltage switch electric appliance operates：Closure will test disconnecting switch in 2201 intervals, 2202 intervals and mother interval, disconnected
Road device is closed disconnecting switch I, IV or II, III, and 2201 intervals, 2202 intervals is made to be connected respectively at two busbares；Other are disconnected to go out
Interval switch, the breaker at line interval；
Primary connection：As shown in the figure, 2201 intervals, 2202 interval distal end two-phases are each connected, such as wiring 1., 4.；It will
Two intervals, which are closed on mutually to draw, is respectively connected to current lifting device and standard current transformer, such as 2., 3.；It is defeated that output voltage regulator connects current lifting device
Enter end；Current lifting device, subject electronic current mutual inductor, standard current transformer series connection；
Secondary connection：Secondary output S1, the S2 of standard current transformer connects the secondary simulation input terminal of calibration equipment；Merge single
First output optical fibre connects calibration equipment DATA IN terminal；Terminal connects calibration equipment and connects calibration equipment synchronizing signal during combining unit pair
Signal when leading-out terminal or combining unit access whole station pair simultaneously with calibration equipment synchronous signal input end.
Field-checking process：
1. carry out high-voltage switch electric appliance operation, primary current wiring, secondary connection according to above-mentioned requirements；
2. the corresponding combining unit in 2201 intervals is connected with calibration equipment, call through test voltage adjusts pressure regulator, to 2201
It is spaced 3 phase, 3 electronic current mutual inductors to verify simultaneously, records pressure regulator zero, power-off after verification data；
3. mother interval is corresponded to combining unit to be connected with calibration equipment, call through test voltage, adjusting pressure regulator, between mother
It is verified simultaneously every 3 phase, 3 electronic current mutual inductors, records pressure regulator zero, power-off after verification data；
4. the corresponding combining unit in 2202 intervals is connected with calibration equipment, call through test voltage, adjusting pressure regulator, between 2202
It is verified simultaneously every 3 phase, 3 electronic current mutual inductors, records pressure regulator zero, power-off after verification data；
5. tearing primary line, secondary line open, recover the original position of high-voltage switch electric appliance.
Traditional checkschema, the electronic current mutual inductors that this 12 are configured equipped with " A sets+B sets " combining unit, for
This 24 grouping error data, experimental facilities aspect need pressure regulator 1, current lifting device 1, standard current transformer 1, verification altogether
Equipment is a set of, 2, a high current line, 2, second test line, optical fiber 2；In terms of experiment process, primary connection is at least needed
12 times, secondary connection 24 times flow up 24 times, and constantly moving with equipment.
And the scheme proposed in the embodiment of the present invention is used, in terms of experimental facilities, pressure regulator 1, current lifting device 1 are needed altogether
Platform, standard current transformer 1, calibration equipment are a set of, 4, a high current line, 2, second test line, optical fiber 2, only compare
Traditional checkschema increases by 2 high current lines；In terms of experiment process, if calibration equipment is only capable of connecing a combining unit, experiment is only
Need primary connection once, secondary connection 1 time, up-flow 6 times, and period equipment is not required move.If calibration equipment can
It can simultaneously be verified simultaneously with connecing more combining units, number can also be reduced in terms of number is flowed up, if can be with during calibration equipment
2 combining units are connect, then flows up number and is decreased to 3 times, if 6 combining units can be connect during calibration equipment, flow up number and subtract
As low as 1 time, you can to realize primary connection to 1 up-flow of the corresponding 24 grouping error parameter of 12 electronic current mutual inductors all
Verification.
The present invention is to the electronic current mutual inductor field-checking of single busbar/double bus scheme form, including being examined before putting into operation
Test, put into operation after first check, periodic inspection, Occasional Survey situations such as, can by the primary connection of technical scheme,
High-voltage switch electric appliance operation, the configuration of calibration equipment carry out field-checking to electronic current mutual inductor, promote electronic current
The field-checking efficiency of mutual inductor.
It applies specific embodiment in the present invention to be set forth the principle of the present invention and embodiment, above example
Explanation be only intended to help understand the present invention method and its core concept；Meanwhile for those of ordinary skill in the art,
Thought according to the invention, there will be changes in specific embodiments and applications, in conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (10)
- A kind of 1. electronic current mutual inductor field calibration system, which is characterized in that the electronic current mutual inductor verification System includes：The single busbar for the electronic current mutual inductor that standard current transformer, current lifting device, calibration equipment and access are tested Wiring；Wherein,In the single bus scheme, the three-phase electronic current mutual inductor that respectively connection one is tested of two adjacent spaces, and it is described Two phase terminals (201) and terminal (204) that two adjacent spaces are closed on are respectively connected to current lifting device and standard current transformer, interval Other two-phase in, terminal (202) is connected with terminal (203), and terminal (205) is connected with terminal (206).
- 2. electronic current mutual inductor field calibration system as described in claim 1, which is characterized in that combining unit output light Fibre connects verifying attachment input terminal, and terminal connects calibration equipment synchronous signal output end during combining unit pair.
- 3. electronic current mutual inductor field calibration system as described in claim 1, which is characterized in that combining unit output light Fibre connects verifying attachment input terminal, and terminal accesses whole station pair simultaneously with calibration equipment synchronous signal input end during combining unit pair When signal.
- 4. electronic current mutual inductor field calibration system as described in claim 1, which is characterized in that the electronic type electricity Current transformer check system further includes：Pressure regulator；The output terminal of the pressure regulator is connected with the input terminal of current lifting device.
- 5. a kind of electronic current mutual inductor on-site calibrating method, which is characterized in that the method is using described in claim 1-4 Electronic current mutual inductor check system the electronic current mutual inductor of subject is verified, the method includes：Breaker, the disconnecting switch at adjacent two interval of access subject electronic current transducer are closed, disconnects other outgoing line intervals Breaker, disconnecting switch；Subject electronic current transducer in single bus scheme shape form is connected in series in checking circuit；The corresponding combining unit in each interval is connected with calibration equipment, call through test voltage adjusts pressure regulator, and each interval is accessed Subject electronic current mutual inductor verified.
- A kind of 6. electronic current mutual inductor field calibration system, which is characterized in that the electronic current mutual inductor verification System includes：The double-bus for the electronic current mutual inductor that standard current transformer, current lifting device, calibration equipment and access are tested Wiring；Wherein,In the double bus scheme, the three-phase electronic current mutual inductor that respectively connection one is tested of two adjacent spaces, and it is described Two phase terminals (401) and terminal (404) that two adjacent spaces are closed on are respectively connected to current lifting device and standard current transformer, interval Other two-phase in, terminal (402) is connected with terminal (403), and terminal (405) is connected with terminal (406).
- 7. electronic current mutual inductor field calibration system as claimed in claim 6, which is characterized in that combining unit output light Fibre connects verifying attachment input terminal, and terminal connects calibration equipment synchronous signal output end during combining unit pair.
- 8. electronic current mutual inductor field calibration system as claimed in claim 6, which is characterized in that combining unit output light Fibre connects verifying attachment input terminal, and terminal accesses whole station pair simultaneously with calibration equipment synchronous signal input end during combining unit pair When signal.
- 9. electronic current mutual inductor field calibration system as claimed in claim 6, which is characterized in that the electronic type electricity Current transformer check system further includes：Pressure regulator；The output terminal of the pressure regulator is connected with the input terminal of current lifting device.
- 10. a kind of electronic current mutual inductor on-site calibrating method, which is characterized in that the method utilizes claim 6-9 institutes The electronic current mutual inductor check system stated verifies the electronic current mutual inductor of subject, and the method includes：It is closed the disconnecting switch for accessing two intervals for being tested electronic current mutual inductor and mother interval, breaker and makes described Two intervals are connected with two busbares, simultaneously switch off disconnecting switch, the mutual inductor of other outgoing line intervals；It will be in the electronic current mutual inductor series connection access checking circuit for the subject that accessed with double-bus；The corresponding combining unit in each interval is connected with calibration equipment, call through test voltage adjusts pressure regulator to each interval access Subject electronic current mutual inductor verified.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810122314.7A CN108089144B (en) | 2018-02-07 | 2018-02-07 | Electronic current transformer field calibration system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810122314.7A CN108089144B (en) | 2018-02-07 | 2018-02-07 | Electronic current transformer field calibration system and method |
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| CN108089144A true CN108089144A (en) | 2018-05-29 |
| CN108089144B CN108089144B (en) | 2020-01-24 |
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| CN109324306A (en) * | 2018-12-14 | 2019-02-12 | 国家电网有限公司 | A kind of GIS device current transformer error test macro and its construction method |
| CN109884568A (en) * | 2019-01-17 | 2019-06-14 | 国网浙江省电力有限公司金华供电公司 | A kind of intelligent substation main transformer sample-synchronous calibration equipment and test method |
| CN110346713A (en) * | 2019-07-30 | 2019-10-18 | 国网浙江省电力公司宁波供电公司 | A method of temperature rise test is completed at the same time for more 10kV on-pole switch primary connections |
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| CN208477096U (en) * | 2018-02-07 | 2019-02-05 | 华北电力科学研究院有限责任公司 | Electronic current mutual inductor field calibration system |
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| KR20090014902A (en) * | 2007-08-07 | 2009-02-11 | 엘에스산전 주식회사 | Electricity meter with a function for detecting failure of current transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109324306A (en) * | 2018-12-14 | 2019-02-12 | 国家电网有限公司 | A kind of GIS device current transformer error test macro and its construction method |
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| CN109884568B (en) * | 2019-01-17 | 2021-09-07 | 国网浙江省电力有限公司金华供电公司 | Main transformer sampling synchronism verification device and testing method for intelligent substation |
| CN110346713A (en) * | 2019-07-30 | 2019-10-18 | 国网浙江省电力公司宁波供电公司 | A method of temperature rise test is completed at the same time for more 10kV on-pole switch primary connections |
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| Publication number | Publication date |
|---|---|
| CN108089144B (en) | 2020-01-24 |
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