CN107037307A - A kind of secondary through-flow method of power plant main system c-type - Google Patents
A kind of secondary through-flow method of power plant main system c-type Download PDFInfo
- Publication number
- CN107037307A CN107037307A CN201710203946.1A CN201710203946A CN107037307A CN 107037307 A CN107037307 A CN 107037307A CN 201710203946 A CN201710203946 A CN 201710203946A CN 107037307 A CN107037307 A CN 107037307A
- Authority
- CN
- China
- Prior art keywords
- relay
- current
- protection tester
- flow
- main system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- 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
Abstract
The invention belongs to electric adjustment and electrical test technical field, and in particular to a kind of secondary through-flow method of power plant electricity main system c-type.This method chooses benchmark CT when secondary through-flow by G-T protective cabinet current channel, by benchmark CT external terminals and subject CT external terminal short circuits in the corresponding body terminal casees of benchmark CT, forms c-type loop.0.1 times of rated current and rated current are exported by relay-protection tester respectively in the corresponding G-T protective cabinet current channel external terminals of benchmark CT; amplitude, phase and the secondary burden of detection subject CT secondary circuit, verify the integrality and accuracy of its secondary circuit.The present invention uses the secondary through-flow method of c-type, without carrying out secondary through-flow test in CT roots, save secondary throughput time, it is easy to operate, it is practical, test efficiency is high, can fast and accurately check CT secondary circuit existing defects, it is adaptable to the secondary through-flow test field of small-sized, medium-sized, Generator Set.
Description
Technical field：
The invention belongs to electric adjustment and electrical test technical field, and in particular to a kind of power plant main system c-type is secondary
Through-flow method.
Background technology：
Current Chinese Economy Development speed is fast, and living standards of the people are increasingly improved, and the fast development of power industry is wherein
Serve key effect.At the beginning of 13 plan, electricity needs is growing day by day, and power system installed capacity constantly rises,
Unit is built to be continuously increased.
During new power plant construction electric adjustment, it need to ensure that all CT wiring are correct, no open circuit phenomenon, all PT wiring are just
Really, no short circuit phenomenon.Power plant electricity main system is high due to voltage class, and equipment operational reliability requires high, and CT configurations are more, and two
The features such as minor loop wiring is complicated, it is necessary to check CT second loop return wirings and carry out through-flow test before electric a whole set of startup,
The instrument capacity that is put to the test is limited, and is carried out once through-flow difficulty height, is generally only carried out secondary through-flow test, it is ensured that be electrically a whole set of to start
It is smoothed out.Method that traditional secondary is through-flow, generally carries out through-flow test, due to primary electrical system CT bodies in CT body terminals case
Terminal box is more dispersed, the shortcomings of in situ test power supply wiring is difficult, there is big working strength, throughput time length, experiment facility
Property difference the problems such as.
The content of the invention：
The purpose of the present invention is that there is provided a kind of power plant electricity master for deficiency present in the through-flow method of traditional secondary
Method that secondary system is through-flow, the accuracy for verifying main system CT secondary circuits, it is ensured that CT secondary circuits without open circuit phenomenon, together
Method that Shi Caiyong c-types are through-flow, primary electrical system bis- through-flow tests of all CT, nothing can be just completed in G-T protective cabinet dosage
Working strength need to be reduced in each only dosage of CT body terminals packing list, the working time is saved, be that unit the whole series startup is smoothed out carrying
For effective guarantee.
To reach above-mentioned purpose, the present invention adopts the following technical scheme that to realize：
A kind of secondary through-flow method of power plant electricity main system c-type, comprises the following steps：
1) the secondary through-flow preliminary preparation of power plant electricity main system c-type is carried out, preparation enters step after terminating
2)；
2) relay-protection tester power supply is opened, regulation relay-protection tester exports 0.1 times of rated current, into step
3)；
3) measure and record CT secondary side actual currents when relay-protection tester exports 0.1 times of rated current, into step
It is rapid 4)；
4) amplitude and phase of CT secondary side currents measurement amplitude and phase and relay-protection tester output current are judged
It is whether consistent, if the determination result is YES, it was demonstrated that this group of CT secondary circuit is completely reliable, carry out step 6)；Otherwise judged result is
Into step 5)；
5) relay-protection tester is closed, searches and eliminates return to step 2 after the CT secondary circuit defects)；
6) regulation relay-protection tester output rated current, into step 7)；
7) CT secondary side actual currents when measuring and recording relay-protection tester output rated current, into step 8)；
8) amplitude and phase of CT secondary side currents measurement amplitude and phase and relay-protection tester output current are judged
It is whether consistent, if the determination result is YES, demonstrate again that the CT secondary circuits are completely reliable, into step 10)；Judged result is no
Then enter step 9)；
9) relay-protection tester is closed, searches and eliminates return to step 6 after the CT secondary circuit defects)；
10) in the case where CT secondary side currents are rated current, measure and record bis- burdens of CT, into step 11)；
11) judge the burden of CT bis- times whether three-phase equilibrium, if the determination result is YES, into step 13), judged result is no
Then enter step 12)；
12) relay-protection tester is closed, searches and eliminates return to step 10 after the CT secondary circuit defects)；
13) remaining each group bis- through-flow tests of CT are carried out successively, until off-test.
The present invention, which is further improved, to be, the step 1) the secondary through-flow test early-stage preparations of power plant main system c-type
Work, detailed process is as follows：
101) loop check is carried out to power plant main system each group CT secondary circuits, from CT roots to CT body terminal casees,
Again to each disk cabinet device, it is ensured that each group CT secondary circuit accuracys, and without open circuit phenomenon；
102) power plant main system each CT body terminals tank current is disconnected in flakes, when preventing CT bis- times through-flow, CT secondary sides
Electric current senses CT primary sides, draws upper each disk cabinet device current channel electric current in flakes, and it is in flakes and electric to fasten current channel electric current
External terminal in stream；
103) G-T protective cabinet current channel includes main system electric current everywhere, and relay-protection tester current channel is connect
To G-T protective cabinet circulation road external terminal, the G-T protective cabinet current channel electric current is disconnected in flakes, in G-T protective cabinet
By step 101 in CT body terminals case where the current channel corresponding current) CT is considered as benchmark CT, in CT body terminal casees
By step 101) benchmark CT external terminals and another group of step 102) CT external terminal short circuits, form c-type current loop；
104) by with step 101) benchmark CT short circuits step 102) CT be considered as subject CT, the step 102 for measuring and recording)
CT secondary circuits are the secondary circuit for being tested CT.
Of the invention further improve be, step 3), step 7) include following flow：
First, measured by clamp ammeter and record subject CT current amplitude and phase sequence in body terminal case；
Then, measured between electronics and record subject CT secondary circuits to each disk cabinet current channel amplitude and phase sequence.
The present invention, which is further improved, to be, the step 4) in, relay-protection tester exports 0.1 times of rated current
When, subject CT secondary loop currents amplitude and phase are contrasted with relay-protection tester output current, if inconsistent, are stopped immediately
Relay-protection tester, checks and eliminates CT secondary circuit defects, proceed after through-flow test, passed examination, according to step
6) regulation relay-protection tester output rated current, check subject CT secondary circuits current amplitude and phase, if still with
Relay-protection tester output current is inconsistent, then the CT secondary circuits still have defect, after after defect expressivity, can be again
Carry out after rated current through-flow test, passed examination, according to step 10) in the case where CT secondary side currents are rated current,
Measure and record bis- burdens of CT, if secondary burden value three-phase equilibrium, bis- through-flow tests of this group of CT terminate, and carry out next group
CT through-flow tests, if uneven, secondary circuit defect still has, after defect to be canceled, proceeds rated current situation
Under it is secondary burden measurement experiment.
Compared with prior art, the present invention has advantages below：
1st, the present invention utilizes the through-flow method of c-type so that through-flow test can complete electric master in G-T protective cabinet dosage
System bis- through-flow tests of all CT, without in each only dosage of CT body terminals packing list, reducing working strength, when saving work
Between, improve test efficiency, it is ensured that CT secondary circuit accuracys.
2nd, the present invention first by relay-protection tester export 0.1 times of rated current, check CT secondary circuits amplitude and
Phase, the very first time finds and eliminates CT circuit defects.
3rd, the present invention exports 0.1 times of rated current in relay-protection tester respectively and relay-protection tester output is specified
Under current conditions, the correctness of CT secondary circuits, and CT bis- times when relay-protection tester exports rated current are judged twice
In the case of loop measurement is correct, bis- burdens of CT are checked, prevent CT secondary circuits from there is wiring and not enough fastening, terminal loosens etc.
Problem.
4th, the present invention is practical, it is adaptable to different power plant electrical main systems, is easy to promote the use of in Commissioning field, it is ensured that
Unit complete start-up test is smoothed out.
In summary, the present invention can save secondary throughput time, easy to operate, practical, and test efficiency is high, can
Fast and accurately check CT secondary circuit existing defects, it is adaptable to the secondary through-flow test of small-sized, medium-sized, Generator Set
Field.
Brief description of the drawings：
Fig. 1 is c-type through-flow test flow chart of the present invention.
Fig. 2 is primary electrical system wiring diagram of the present invention.
Fig. 3 is the secondary through-flow exemplary plot of c-type.
In figure：1- relay-protection testers, (generator neutral point CT electric currents lead to 2- G-T protective A cabinet terminal blocks figure
Road), 3- generator CT body terminal casees, 101,102,103,104 be generator neutral point CT, and 105,106,107,108 be hair
Motor generator terminal CT,；201st, high-pressure side cannula C T is become based on 202,203,204 be neutral point of main transformer zero sequence CT, and 205,206 be main transformer
Neutral point clearance zero sequence protection CT, 301,302,303,304,305,306,307,308 be booster stations main transformer interval CT, 401,402,
403rd, 404,405 be factory height become high-pressure side CT, 406,407 be A branches zero sequence CT, 408,409 be B branches zero sequence CT, 501,
502nd, 503,504 be 6kV A forked working inlet wires CT, and 601,602,603,604 be 6kV B forked working inlet wires CT, 701,
702nd, 703 be excitation-transformation variable high-pressure side CT, and 704,705,706 be excitation low pressure side CT.
Embodiment：
Below by accompanying drawing, technical scheme is described in further detail.
As shown in Figure 1, Figure 2 and Figure 3, a kind of secondary through-flow method of power plant electricity main system c-type of the present invention, bag
Include following steps：
1) the secondary through-flow test preliminary preparation of c-type is carried out, treats to enter step 2 after the completion of all preliminary preparations)；
2) relay-protection tester power supply is opened, regulation relay-protection tester exports 0.1 times of rated current, and enters step
It is rapid 3)；
3) measure and record CT secondary side actual currents when relay-protection tester exports 0.1 times of rated current, with laggard
Enter step 4)；
4) judge CT secondary side currents measurement amplitude and phase is with relay-protection tester output current amplitude and phase
It is no consistent, if the determination result is YES, into step 6)；If judged result is no, into step 5)；
5) relay-protection tester is closed, searches and eliminates return to step 2 after the CT secondary circuit defects)；
6) regulation relay-protection tester output rated current, into step 7)；
7) CT secondary side actual currents when measuring and recording relay-protection tester output rated current, subsequently enter step
8)；
8) judge CT secondary side currents measurement amplitude and phase is with relay-protection tester output current amplitude and phase
It is no consistent, if the determination result is YES, into step 10)；If judged result is no, into step 9)；
9) relay-protection tester is closed, searches and eliminates return to step 6 after the CT secondary circuit defects)；
10) in the case where CT secondary side currents are rated current, measure and record bis- burdens of CT, subsequently enter step
11)；
11) judge the burden of CT bis- times whether three-phase equilibrium, if the determination result is YES, into step 13)；If judged result is
It is no, then into step 12)；
12) relay-protection tester is closed, searches and eliminates return to step 10 after the CT secondary circuit defects)；
13) remaining each group bis- through-flow tests of CT are carried out successively, until off-test.
In this example, the step 1) the secondary through-flow test preliminary preparation of power plant electricity main system, its specific stream
Journey is as follows：
101) loop check is carried out to power plant main system each group CT secondary circuits, from CT roots to CT body terminal casees,
Again to each disk cabinet device, it is ensured that each group CT secondary circuit accuracys, and without open circuit phenomenon；
102) power plant main system each CT body terminals tank current is disconnected in flakes, when preventing CT bis- times through-flow, CT secondary sides
Electric current senses CT primary sides, draws upper each disk cabinet device current channel electric current in flakes, and it is in flakes and electric to fasten current channel electric current
External terminal in stream；
103) G-T protective cabinet current channel includes main system electric current everywhere, and relay-protection tester current channel is connect
To G-T protective A cabinet generator generator terminal CT current channel external terminals, disconnect G-T protective A cabinet generator generator terminal CT electric currents and lead to
Road electric current in flakes, will be connected to that group of CT of G-T protective A cabinets and be considered as 1LH in benchmark CT, i.e. figure in generator CT body terminal casees,
By 1LH external terminals and 2LH external terminal short circuits in generator CT body terminal casees, then 2LH is subject CT.
In the present embodiment, the step 3), step 7) include following flow：
301) measured by clamp ammeter and record 2LH current amplitude and phase sequence in body terminal case；
302) measured between electronics and record 2LH secondary circuits to the amplitude and phase sequence for protecting B cabinet electric currents.
In the present embodiment, above-mentioned steps 4) in, when relay-protection tester exports 0.1 times of rated current, subject CT bis- times
Loop current amplitude and phase are contrasted with relay-protection tester output current, it should difference less, if current amplitude difference compared with
Big or current phase mistake, then stop relay-protection tester, check and eliminate CT secondary circuit defects, can continue immediately
Carry out after through-flow test, passed examination, according to step 6) regulation relay-protection tester output rated current, check subject CT bis-
The current amplitude and phase of minor loop, if current amplitude is still larger with relay-protection tester output current, the CT bis- times
Loop still has defect, after after defect expressivity, can carry out again after rated current through-flow test, passed examination, according to step
It is rapid 10) in the case where CT secondary side currents are rated current, measure and record the burden of CT bis- times, if secondary burden value three is flat
Weighing apparatus, then bis- through-flow tests of this group of CT terminate, and carry out next group of CT through-flow test, if uneven, secondary circuit defect is still
In the presence of after defect to be canceled, secondary burden measurement is tested in the case of proceeding rated current.
In this example, when carrying out the secondary through-flow test of power plant electricity main system, 2LH bis- times in engine block terminal box
After through-flow test terminates, relay-protection tester is closed, 1LH and 2LH external terminal shorting stubs in engine block terminal box are removed,
Short circuit 1LH and 3LH external terminal, and 3LH is considered as subject CT, carry out bis- through-flow tests of 3LH.By the method, in transformer unit
Protection cabinet in by certain current channel correspondence CT is considered as benchmark CT, in benchmark CT body terminal casees, short circuit subject CT external terminals and
Benchmark CT external terminals, are added by relay-protection tester in G-T protective cabinet benchmark CT corresponding current passage external terminals
Amount, carries out each bis- through-flow tests of CT of generator primary electrical system successively.
It is described above, only it is presently preferred embodiments of the present invention, not the present invention is imposed any restrictions, it is every according to the present invention
Any simple modification, change and equivalent structure change that technical spirit is made to above example, still fall within skill of the present invention
In the protection domain of art scheme.
Claims (4)
1. a kind of secondary through-flow method of power plant electricity main system c-type, it is characterised in that comprise the following steps：
1) the secondary through-flow preliminary preparation of power plant electricity main system c-type is carried out, preparation enters step 2 after terminating)；
2) relay-protection tester power supply is opened, regulation relay-protection tester exports 0.1 times of rated current, into step 3)；
3) measure and record CT secondary side actual currents when relay-protection tester exports 0.1 times of rated current, into step 4)；
4) judge CT secondary side currents measurement amplitude and phase and relay-protection tester output current amplitude and phase whether
Unanimously, if the determination result is YES, it was demonstrated that this group of CT secondary circuit is completely reliable, step 6 is carried out)；Judged result is otherwise to enter
Step 5)；
5) relay-protection tester is closed, searches and eliminates return to step 2 after the CT secondary circuit defects)；
6) regulation relay-protection tester output rated current, into step 7)；
7) CT secondary side actual currents when measuring and recording relay-protection tester output rated current, into step 8)；
8) judge CT secondary side currents measurement amplitude and phase and relay-protection tester output current amplitude and phase whether
Unanimously, if the determination result is YES, demonstrate again that the CT secondary circuits are completely reliable, into step 10)；Judged result is otherwise to enter
Enter step 9)；
9) relay-protection tester is closed, searches and eliminates return to step 6 after the CT secondary circuit defects)；
10) in the case where CT secondary side currents are rated current, measure and record bis- burdens of CT, into step 11)；
11) judge the burden of CT bis- times whether three-phase equilibrium, if the determination result is YES, into step 13), otherwise judged result is enters
Enter step 12)；
12) relay-protection tester is closed, searches and eliminates return to step 10 after the CT secondary circuit defects)；
13) remaining each group bis- through-flow tests of CT are carried out successively, until off-test.
2. a kind of secondary through-flow method of power plant electricity main system c-type according to claims 1, it is characterised in that institute
State step 1) the secondary through-flow test preliminary preparation of power plant main system c-type, detailed process is as follows：
101) loop check is carried out to power plant main system each group CT secondary circuits, from CT roots to CT body terminal casees, then extremely
Each disk cabinet device, it is ensured that each group CT secondary circuit accuracys, and without open circuit phenomenon；
102) power plant main system each CT body terminals tank current is disconnected in flakes, when preventing CT bis- times through-flow, CT secondary side currents
CT primary sides are sensed, upper each disk cabinet device current channel electric current are drawn in flakes, and fasten current channel electric current in flakes and in electric current
External terminal；
103) G-T protective cabinet current channel includes main system electric current everywhere, and relay-protection tester current channel is connected into hair
Change group protects cabinet circulation road external terminal, the G-T protective cabinet current channel electric current is disconnected in flakes, in the G-T protective cabinet electricity
By step 101 in CT body terminals case where circulation road corresponding current) CT is considered as benchmark CT, and will step in CT body terminal casees
Rapid 101) benchmark CT external terminals and another group of step 102) CT external terminal short circuits, form c-type current loop；
104) by with step 101) benchmark CT short circuits step 102) CT be considered as subject CT, the step 102 for measuring and recording) CT bis-
Minor loop is the secondary circuit for being tested CT.
3. a kind of secondary through-flow method of power plant main system c-type according to claims 1, it is characterised in that step 3),
Step 7) include following flow：
First, measured by clamp ammeter and record subject CT current amplitude and phase sequence in body terminal case；
Then, measured between electronics and record subject CT secondary circuits to each disk cabinet current channel amplitude and phase sequence.
4. a kind of secondary through-flow method of power plant main system c-type according to claims 1, it is characterised in that the step
It is rapid 4) in, when relay-protection tester exports 0.1 times of rated current, subject CT secondary loop currents amplitude and phase and relay are protected
The contrast of tester output current is protected, if inconsistent, stops relay-protection tester immediately, checks and eliminates CT secondary circuits and lack
Fall into, proceed after through-flow test, passed examination, according to step 6) regulation relay-protection tester output rated current, check
It is tested the current amplitude and phase of CT secondary circuits, if still inconsistent with relay-protection tester output current, the CT bis-
Minor loop still has defect, after after defect expressivity, can carry out again after rated current through-flow test, passed examination, according to
Step 10) in the case where CT secondary side currents are rated current, measure and record bis- burdens of CT, if secondary burden value three-phase
Balance, then bis- through-flow tests of this group of CT terminate, and carry out next group of CT through-flow test, if uneven, secondary circuit defect is still
So exist, after defect to be canceled, proceed secondary burden measurement experiment in the case of rated current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710203946.1A CN107037307B (en) | 2017-03-30 | 2017-03-30 | A kind of secondary through-flow method of power plant main system c-type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710203946.1A CN107037307B (en) | 2017-03-30 | 2017-03-30 | A kind of secondary through-flow method of power plant main system c-type |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107037307A true CN107037307A (en) | 2017-08-11 |
| CN107037307B CN107037307B (en) | 2019-06-04 |
Family
ID=59533465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710203946.1A Active CN107037307B (en) | 2017-03-30 | 2017-03-30 | A kind of secondary through-flow method of power plant main system c-type |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107037307B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413657A (en) * | 2020-04-13 | 2020-07-14 | 西安热工研究院有限公司 | CT body secondary circuit calibration method |
| CN111707981A (en) * | 2020-07-10 | 2020-09-25 | 西安热工研究院有限公司 | CT indirect secondary through-flow method for generator set |
| CN112986856A (en) * | 2021-03-26 | 2021-06-18 | 西安热工研究院有限公司 | Method for checking integrity of three-phase current secondary circuit of power plant |
| CN113589214A (en) * | 2021-08-05 | 2021-11-02 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | CT secondary through-flow method for power plant |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1217707A1 (en) * | 2000-12-20 | 2002-06-26 | Schneider Electric Industries SA | Device for termination of primary current in a current transformer having saturation compensation means |
| CN101867225A (en) * | 2010-05-31 | 2010-10-20 | 江苏省电力公司南通供电公司 | Debugging method for integrated automation of transformer substation and integration of relaying protection system |
| CN202975222U (en) * | 2012-11-28 | 2013-06-05 | 沧州供电公司 | Integrated tester for secondary circuit of current transformer |
| CN105022017A (en) * | 2015-07-22 | 2015-11-04 | 国家电网公司 | Portable CT circuit flow test instrument |
| CN205080251U (en) * | 2015-10-14 | 2016-03-09 | 大唐碧口水力发电厂 | Through -flow calibration system of current transformer secondary circuit |
-
2017
- 2017-03-30 CN CN201710203946.1A patent/CN107037307B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1217707A1 (en) * | 2000-12-20 | 2002-06-26 | Schneider Electric Industries SA | Device for termination of primary current in a current transformer having saturation compensation means |
| CN101867225A (en) * | 2010-05-31 | 2010-10-20 | 江苏省电力公司南通供电公司 | Debugging method for integrated automation of transformer substation and integration of relaying protection system |
| CN202975222U (en) * | 2012-11-28 | 2013-06-05 | 沧州供电公司 | Integrated tester for secondary circuit of current transformer |
| CN105022017A (en) * | 2015-07-22 | 2015-11-04 | 国家电网公司 | Portable CT circuit flow test instrument |
| CN205080251U (en) * | 2015-10-14 | 2016-03-09 | 大唐碧口水力发电厂 | Through -flow calibration system of current transformer secondary circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413657A (en) * | 2020-04-13 | 2020-07-14 | 西安热工研究院有限公司 | CT body secondary circuit calibration method |
| CN111707981A (en) * | 2020-07-10 | 2020-09-25 | 西安热工研究院有限公司 | CT indirect secondary through-flow method for generator set |
| CN112986856A (en) * | 2021-03-26 | 2021-06-18 | 西安热工研究院有限公司 | Method for checking integrity of three-phase current secondary circuit of power plant |
| CN113589214A (en) * | 2021-08-05 | 2021-11-02 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | CT secondary through-flow method for power plant |
| CN113589214B (en) * | 2021-08-05 | 2024-02-20 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | CT (computed tomography) secondary through-flow method for power plant |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107037307B (en) | 2019-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107037307A (en) | A kind of secondary through-flow method of power plant main system c-type | |
| CN101706535B (en) | Device and method for testing dielectric loss of high voltage transformer | |
| CN103257286B (en) | A kind of charging electric vehicle facility automatic test approach and system | |
| CN103438797B (en) | Deformation of transformer winding online test method and system | |
| CN104793148B (en) | Distributed generator islanding detection method based on grid entry point characteristic harmonics voltage measurement | |
| CN102721898A (en) | On-line measurement method and on-line measurement system for deformation of transformer winding | |
| CN106526479B (en) | Power shovel electrical malfunction diagnostic method based on mains by harmonics feature | |
| CN102023249A (en) | Method for performing preventive test without detaching high-voltage lead of 220-kV zinc oxide arrestor | |
| CN102565618A (en) | Method for detecting zero-sequence voltage circuit of transformer substation | |
| CN204044268U (en) | A kind of city rail current transformer general low-voltage Auto-Test System | |
| CN104251978B (en) | Straight-flow system exchanges the test device that crosstalk and voltage pulsation influence on relay | |
| CN108562860A (en) | Electric energy meter two-way accessory power supply power consumption Auto-Test System and test method | |
| CN204740329U (en) | High -low pressure AC motor testing system | |
| CN105866592B (en) | Dynamic passive compensation response wave shape acquisition system and acquisition method | |
| CN205679693U (en) | A kind of alternating-current charging pile calibrating installation | |
| CN103076529B (en) | CT secondary circuit intelligent detecting method | |
| CN205749774U (en) | Air bag conservator vacuum extractor and transformer oil paper insulation test system | |
| CN106443537A (en) | Calibration method for online capacitive equipment insulation parameter monitoring device and calibration equipment | |
| CN104049161A (en) | Testing connecting structure and testing method for substation field lightning arrester without demounting primary high-voltage lead | |
| CN103743994B (en) | Low-voltage load test method and device | |
| CN103954869B (en) | Cable power frequency parameter testing device based on PXI system | |
| CN107037389A (en) | A kind of PT leads to pressure method | |
| CN207965041U (en) | Electric wire ac voltage withstanding automatic test equipment | |
| CN102628915B (en) | Electrical submersible pump on-line insulation detection device | |
| CN205861818U (en) | A kind of N600 one point earth test device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |