CN102095981A - Method for realizing differential protection CT (Current Transformer) loop wiring analysis of exciting transformer - Google Patents
Method for realizing differential protection CT (Current Transformer) loop wiring analysis of exciting transformer Download PDFInfo
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- CN102095981A CN102095981A CN2009103115650A CN200910311565A CN102095981A CN 102095981 A CN102095981 A CN 102095981A CN 2009103115650 A CN2009103115650 A CN 2009103115650A CN 200910311565 A CN200910311565 A CN 200910311565A CN 102095981 A CN102095981 A CN 102095981A
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Abstract
The invention relates to a method for realizing differential protection CT (Current Transformer) loop wiring analysis of an exciting transformer. The method comprises the following steps of: (1) drawing a correct vector diagram of the loop; (2) drawing an actually measured vector diagram through reference voltage; (3) outputting a wiring correctness analysis result of the loop; (4) finishing the measurements and the judgments of the wiring correctness of all conjunction units; (5) drawing vector diagrams of options of the CT at various sides of the differential protection loop of the exciting transformer through the reference voltage by adopting a method of simultaneously measuring identical phases at various sides, and converting the measurement value of the differential protection CT loop according to the exciting transformer and parameters thereof; and (6) analyzing and judging the conjunction analysis result; outputting the analysis result, and if the conjunction analysis result is incorrect, checking the lead-out polarization and change of the CT according to the analysis result, and if the conjunction analysis result is correct, outputting the conjunction correctness analysis result of the exciting transformer. The method has the advantages of reliable analysis result and greatly-improved accuracy.
Description
Technical field
The present invention relates to relay protection CT circuit connection correctness analytical approach in a kind of electric system, relate in particular to a kind of wiring to exciting transformer differential protecting CT loop in the electric system whether correct, close the analytical approach of whether correctly analyzing, judge and provide the false wiring type mutually.
Background technology
Will satisfy to differ 120 ° between phase and phase for the correctness of single CT circuit connection, and phase sequence is identical, is positive sequence or negative phase-sequence, each phase current two sub-value is identical.It is identical with the primary current value in measurement loop that the current effective value of measuring according to secondary multiply by the primary current value that the CT transformation-ratio meter calculates.
For the exciting transformer differential protection, calculate the resultant vector of each phase of mains side and the resultant vector of each phase of load side.When each winding all satisfies the phase angle balance, promptly differ 120 ° between phase and phase, and phase sequence is identical, be positive sequence or negative phase-sequence.Simultaneously mains side and load side every mutually vector and when being zero, promptly amplitude equates, to differ 180 ° be that decidable exciting transformer differential protecting CT circuit connection is correct to angle.
The correctness of exciting transformer differential protecting CT circuit connection directly influences the normal operation of electric power system.The correctness of relay protection CT circuit connection is in time made analysis, judged; requisite important step during to be that transformer station is newly-built put into operation, overhaul; exciting transformer differential protecting CT circuit connection correctness is analyzed at present; main by manually carrying out Zhao especially main transformer, bus differential protecting CT loop; the staff will pass through a large amount of calculating; manual drawing current vector figure, and then draw the analysis result of relay protection CT circuit connection correctness according to result of calculation and vector plot.The The whole analytical process calculated amount is big, and needs the staff rule of thumb to judge, so there is the shortcoming that efficient is low, error is big.The flow process that the tradition manual method is analyzed relay protection CT circuit connection correctness is as follows:
1) obtains data: the current amplitude, phase data and the correlation parameter that obtain each each phase of winding of exciting transformer differential protecting CT loop.Generally obtain (as using two pincers volt-ampere phase meters), the measured value of current amplitude, phase data and the measurement loop measured is compared, judge the correctness of single CT circuit connection by power measuring instrument.For two circle main transformers, use two pincers volt-ampere phase meters measure successively each phase (A, B, C, N) current amplitude of high-pressure side CT and low-pressure side CT and phase place and with compared by situation to determine the correctness of each side CT circuit connection according to meritorious, idle the sending of measuring the loop.
2) calculate electric current: calculate the coefficient of balance of each side earlier according to rated voltage and CT no-load voltage ratio, and then current amplitude is converted according to coefficient of balance.
3) adjust phase place: current phase is adjusted according to the mode of connection.
4) draw vector plot: according to parameter manual drawing vector plots such as reference voltage, current amplitude, phase angles.
5) analysis and judgement: judge CT circuit connection correctness according to each side through current value after the EQUILIBRIUM CALCULATION FOR PROCESS and vector plot, if wiring error needs profiling error reason and correcting method.Judge according to the pacing items that mains side resultant vector and load side resultant vector should equal and opposite in directions, direction is opposite whether whole differential circuit wiring is correct.If incorrect, then rule of thumb judge by the staff, provide correction scheme, this step does not have the flow process of standard, fully by staff quality's decision, if there is not experience, judging so wastes time and energy, and is difficult to judge for complicated error situation.
Summary of the invention
For solve under the at present artificial situation exciting transformer differential protecting CT circuit connection error situation judged waste time and energy, to the demanding situation of staff, the invention provides the analysis and judgement method of a kind of reliability height, simple, easy to operate exciting transformer differential protecting CT circuit connection correctness safe in utilization.
The technical solution that the present invention solves the problems of the technologies described above is:
Be used to realize the method for exciting transformer differential protecting CT circuit connection analysis, its special character is: this method may further comprise the steps:
Draw the correct vector plot in this loop: collect this loop meritorious, idle send, be subjected to situation; Draw the correct vector plot in this loop with reference voltage;
Draw the vector plot of actual measurement with reference voltage;
3) export this circuit connection correctness analysis result:
3.1) vector plot and the step 2 that the step 1) gained is correct) vector plot of gained actual measurement compares to judge the correctness of wiring;
3.2) if judge to such an extent that wiring wiring erroneous results then corrects wiring according to analysis, judged result;
3.3) if judge to such an extent that wiring wiring result correctly then exports this circuit connection correctness analysis result;
4) finish all measurements of closing facies unit wiring correctness, judgement;
5) adopt the simultaneously-measured method of each side homophase to draw the vector plot of each side CT selected item of exciting transformer differential protection loop with reference voltage; According to exciting transformer and parameter thereof exciting transformer differential protecting CT loop measured value is converted.
6) analyze, judge and close the facies analysis result, and the output analysis result then checks that according to analysis result CT draws polarity and variation if close the facies analysis erroneous results; If closing the facies analysis result correctly then exports exciting transformer and closes phase correctness analysis result.
The specific implementation method of the above step 5) is:
5.1) calculate the coefficient of balance of each winding of exciting transformer;
5.2) according to the convert current effective value of this winding of the coefficient of balance of each winding of exciting transformer;
5.3) all current phases are deducted with the measurement loop is the phase power angle of reference;
5.4) judge whether reference voltage is Ua, if then direct execution in step 2.5); If not then reference voltage being converted to behind the Ua execution in step 2.5 again);
5.5) if exciting transformer differential protecting CT loop is analyzed; then to carry out causing the compensation of each side primary current phase difference, preserve parameter and execution in step 6 after converting then) owing to the difference of a winding connection mode of each side of exciting transformer.
The above step 5.1) computing method for the coefficient of balance of exciting transformer differential protection in are:
5.1.1) calculate the secondary rated current of each winding;
Formula one:
Have according to formula one:
Formula two is then arranged:
Wherein, S is the capacity of exciting transformer;
U is a winding primary side rated line voltage;
I is a winding primary side rated current;
Ie is a winding secondary rated current;
Nct is a winding CT no-load voltage ratio.
Calculate the secondary rated current of each winding according to above-mentioned formula two.
5.1.2) one coefficient of balance establishing a rated current maximum of each winding is 1, converts the coefficient of balance of other windings;
5.1.3) coefficient of balance should be smaller or equal to 4, if having in each lateral balance coefficient greater than 4, so it are made as 4, again the coefficient of balance of other windings is changed.
Above-mentioned steps 5.2) computing method of exciting transformer differential protection coefficient of balance are in:
Become example with two circles, have according to formula two:
Wherein, Ihe is the high-pressure side rated current; Uh is the high-pressure side rated voltage; Nhct is a high-pressure side CT no-load voltage ratio;
Ile is the low-pressure side rated current; Ul is the low-pressure side rated voltage; Nlct is a low-pressure side CT no-load voltage ratio.
With the high-pressure side is benchmark, calculates the coefficient of balance of other windings, and promptly establishing high-pressure side coefficient of balance Kh is 1, then low-pressure side coefficient of balance Kl=(Uh * Nhct)/(Ul * Nlct).
The coefficient of balance of each winding in the time of in like manner can calculating three circle changes or other situation.
The above step 3.2) in, error situation is corrected according to the wiring state of output.The wiring state of its each phase has respectively for certain winding or linkage unit:
A has mutually: the A phase connection is correct, A joins instead with B, A joins instead with C, A phase polarity connects instead, A joins with B, and anti-and current B phase polarity connects instead, A joins anti-with C and current C phase polarity connects instead;
B has mutually: the B phase connection is correct, B joins instead with A, B joins instead with C, B joins with A, and anti-and current A phase polarity connects instead, B phase polarity connects instead, B joins anti-with C and current C phase polarity connects instead;
C has mutually: the C phase connection is correct, C joins instead with A, C joins instead with B, C joins with A, and anti-and current A phase polarity connects instead, C joins with B, and anti-and current B phase polarity connects instead, C phase polarity connects instead.
Advantage of the present invention is as follows:
1) analysis result is reliable, and accuracy significantly improves.
The analytical approach in relay protection of power system CT provided by the present invention loop is carried out twice analysis; judge at each CT loop and the differential CT of exciting transformer loop; can provide perfect wiring error situation and correction scheme in the final analysis result that forms; need not again the people for judging; its analysis result reliability obviously analytical approach than traditional is strong; and not influenced by aspects such as subjective quality of staff and objective environment factor, make precision of analysis significantly improve.
2) simple to operate, safe and reliable.
The present invention oversimplifies the analytical work of electric relay protection CT circuit connection, only need simply measure and can analyze and provide the result automatically, and staff's technical merit is required significantly to reduce.
3) input of 4 road electric currents is arranged, can carry out the measurement of 4 road current amplitudes, phase place simultaneously at most, measure when satisfying 4 current return amplitudes of transformer and phase place at most, guaranteed to close the accuracy of phase time data, avoided owing to load in the measuring process changes, passes through the mistake of closing the phase result that power flow direction changes and causes.
Description of drawings
Schematic flow sheet for connection analysis method provided by the present invention;
Fig. 1 is for the present invention is meritorious, the idle synoptic diagram that concerns that is subjected to situation and quadrant that send.
Embodiment
The idiographic flow that the invention provides a kind of exciting transformer differential protecting CT circuit connection correctness analytical approach wiring analysis is as follows:
1, obtain the basis for estimation of judging protection CT circuit connection correctness:
Meritorious, idle send, be subjected to situation by what the transformer station of measuring loop, stoichiometric point or interrelate with it obtained this loop, meritorious, idle sending according to this loop are subjected to the correct phase angle of definite this unit secondary such as situation, primary current effective value and the effective value of electric current, need select a reference voltage when measuring, the current phase of being surveyed is meant the phase place of tested electric current with respect to this reference voltage.Reference voltage can be selected by the operator when measuring voluntarily.
2, according to the basis for estimation the obtained correct vector plot that draws:
For example: pass through measurement loop, stoichiometric point or the transformer station that interrelates with it obtain the meritorious of this loop, idle send that to be subjected to situation be that (sending and being subjected to situation is benchmark with the bus, flow into bus for being subjected to, flow out bus for sending, send on the occasion of, be subjected to be negative value): send meritorious 25MW, send idle 25MW, can calculate tg φ=Q/P=1 so, pass through arctg=1 so, just can obtain φ=45 ° and in first quartile, if be reference voltage with Ua this moment, the phasing degree of Ia is 45 ° so, come the picture vector plot according to positive sequence, the phasing degree of Ib is 165 °, and the phasing degree of Ic is 285 °.If it is meritorious, idle send that to be subjected to situation be to send meritorious 25MW, be subjected to idle-25MW, can calculate tg φ=Q/P=-1 so, pass through arctg-1 so, just can obtain φ=135 ° or 315 °, according to meritorious, the idle situation that is subjected to of sending, the phasing degree should be at the 4th quadrant as can be seen, the phasing degree just should be 315 ° so, and is meritorious, the idle relation that is subjected to situation and quadrant of sending is referring to Fig. 1, so if be reference voltage with Ua this moment, the phasing degree of Ia is 315 ° so, come the picture vector plot according to positive sequence, the phasing degree of Ib is 75 °, and the phasing degree of Ic is 195 °.The calculating of protection CT secondary current effective value is relevant with the no-load voltage ratio in metering CT loop; if the no-load voltage ratio of two CT groups is identical, the effective value of secondary current just equate or the primary current that will measure the CT loop secondary current effective value after according to the no-load voltage ratio conversion equal.If the no-load voltage ratio difference of two CT groups, the effective value of secondary current is just unequal, and the primary current that need record measurement loop calculates the secondary current effective value in protection loop according to the no-load voltage ratio of protection loop CT.After phase angle and amplitude were determined, correct vector plot just can have been drawn out.
3, the phase place and the amplitude of each phase current of actual measurement protection CT loop:
With Ua is the phasing degree that reference voltage records Ia, Ib, Ic.With the phase voltage table record secondary current effective value (this measured value will with measure primary current that the CT loop records no-load voltage ratio according to protection loop CT, the secondary current effective value that calculates the protection loop equates).Draw out actual vector plot on this basis.
4, with the vector plot in the protection CT loop of actual measurement with according to measure correct vector plot that the CT loop drawn compare analysis, judge the correctness of this protection loop CT wiring:
5, according to exciting transformer and parameter thereof exciting transformer differential protecting CT loop measured value is converted;
6, by above-mentioned work each side winding connection error analysis of exciting transformer, judgement are finished, the staff need correct the wiring of mistake, again measure after the correction, till wiring is correct, to notice in the wiring correction process that each side CT loop extension line of conventional main transformer is an end of the same name, guarantee it is that end of the same name is drawn.
7, adopt the simultaneously-measured method of each side homophase, the correctness of analyze, each side of judgement exciting transformer differential protection being closed the phase result:
The phase parameters needed was closed in needed exciting transformer differential protecting CT loop in the middle of input was analyzed before analyzing.
Close phase for exciting transformer differential protecting CT loop: comprise winding connection mode of exciting transformer, each winding CT no-load voltage ratio, each winding rated voltage, main electrical scheme situation and the pairing switch number of each CT winding (being used to draw vector plot); Whether the difference of a winding connection mode of each side of exciting transformer and cause the compensation of each side primary current phase difference corrects compensation by each side CT mode of connection; Import selected reference voltage.
7.1 calculated equilibrium coefficient.
Formula one:
Have according to formula one:
Formula two is then arranged:
Wherein, S is the capacity of main transformer;
U is a winding primary side rated line voltage;
I is a winding primary side rated current;
Ie is a winding secondary rated current;
Nct is a winding CT no-load voltage ratio.
At first, calculate the secondary rated current of each winding according to above-mentioned formula two.For example in becoming, exciting transformer differential protection two circles calculate high-pressure side secondary rated current Ihe, low-pressure side secondary rated current Ile according to formula two respectively;
Then, one coefficient of balance establishing each side rated current maximum is 1, calculates the coefficient of balance of other sides.Be respectively 1000A, 5000A as Ihe, Ile, the coefficient of balance Kl that then establishes Ile is 1, then Kh=Ile/Ihe;
At last, coefficient of balance should be smaller or equal to 4 (amplifying current error if cross conference).If have in each lateral balance coefficient, so it is made as 4, again with the coefficient of balance conversion of other windings greater than 4.As above Kh, Kl are respectively 5,1, and then establishing Kh is 4, so, and Kl=1 * 4/5.
Other computing method of exciting transformer differential protection coefficient of balance:
According to formula two other computing method of can deriving.As: become for two circles, can obtain
Wherein, Ihe is a high-pressure side secondary rated current; Uh is the high-pressure side rated voltage; Nhct is a high-pressure side CT no-load voltage ratio; Ile is a low-pressure side secondary rated current; Ul is the low-pressure side rated voltage; Nlct is a low-pressure side CT no-load voltage ratio.
With the high-pressure side is benchmark, the calculated equilibrium coefficient, and promptly establishing high-pressure side coefficient of balance Kh is 1, then low-pressure side coefficient of balance Kl=(Uh * Nhct)/(Ul * Nlct).
The coefficient of balance of each winding in the time of in like manner can calculating three circle changes or other situation.
7.2 according to coefficient of balance conversion current effective value.
Each winding current be multiply by its corresponding coefficient of balance.As above in the example, then each winding (A, B, C three-phase, down with) current amplitude of surveying be multiply by its coefficient of balance, promptly enclose that change mesohigh side three-phase current amplitude multiply by Kh, low-pressure side multiply by Kl in that the exciting transformer differential protection is two.
In addition, for main transformer, if passed through the secondary connection adjustment, needing the diabolo wiring so (is △-1, △-3 ... △-11) winding three-phase electric current all multiply by 1.732 (i.e. 3 square roots).
7.2.1 carry out the current amplitude adjustment according to option.
1) reference voltage is converted to Ua.
Can select arbitrary voltage as a reference according to field condition when measuring, reference voltage might be one of Ua, Ub, Uc, Uab, Ubc, Uca so, and needing to be Ua with reference to phase transformation, to make things convenient for subsequent analysis.
According to the electric system principle 5 kinds of situations are arranged: Ua120 ° of Ub hysteresis, Ua240 ° of Uc hysteresis, Ua330 ° of Uab hysteresis, Ua90 ° of Ubc hysteresis, Ua210 ° of Uca hysteresis.
Conversion regime is: according to the reference voltage of selecting, all current phases are added that all corresponding angle gets final product.Specific as follows:
When reference voltage is Ub, be-120 ° with reference to winding A phase current phase angle, as long as each all adds 120 ° mutually to all windings, reference voltage can be converted to Ua so;
When reference voltage was Uc, A phase phase angle was-240 °, gave 240 ° of each additions of each winding.
When reference voltage was Uab, A phase phase angle was 30 °, gave 330 ° of each additions of each winding.
When reference voltage was Ubc, A phase phase angle was-90 °, gave 90 ° of each additions of each winding.
When reference voltage was Uac, A phase phase angle was-210 °, gave 210 ° of each additions of each winding.
2) unify the mode of connection of main transformer.
This step only is used for exciting transformer differential protecting CT loop, needs the mode of connection of all windings is adjusted into identical with reference to winding in this step.For a certain winding of exciting transformer, its mode of connection has 13 kinds (Y, △-1, Y-2, △-3, Y-2, △-3, Y-4, △-5, Y-6, △-7, Y-8, △-9, Y-10, △-11, Y-12).Suppose that certain exciting transformer is that three circles become, the mode of connection is Y/Y/ △-11, is reference voltage if select high-pressure side Ua when measuring, and then medium voltage side and low-pressure side will be adjusted into the Y wiring in this step.
The adjustment mode is: each phase phase place of winding is deducted an angle φ simultaneously.
φ＝30×(B1-B0)
Wherein, B0 is the mode of connection subscript with reference to winding, and B1 is the wiring subscript of the winding that will adjust.
As above-mentioned exciting transformer mesohigh side joint line mode is Y, then is designated as 0 under its mode of connection.The medium voltage side mode of connection is Y, then each phase current phase place of medium voltage side is all deducted 0 ° (promptly 30 * (0-0)), and the low-pressure side mode of connection is △-11, so, deducts 330 ° promptly 30 * (11-0) simultaneously for low-pressure side A, B, C three-phase) it can be adjusted into the Y wiring.
8, output conclusion
Last analysis result has two kinds of situations: the one, and wiring is correct, and the 2nd, wiring error.
9. the algorithm basic theories is verified and conclusion
For the judgement of each side CT circuit connection correctness of exciting transformer be based on each loop meritorious, idle send the actual conditions that are subjected to, so if determined that each loop is meritorious, idle sending be subjected to situation just can be easily, the correctness of definite CT circuit connection intuitively.After having guaranteed each side CT circuit connection correctness of exciting transformer; adopt the simultaneously-measured method of each side homophase to do the phase of closing in exciting transformer differential protecting CT loop; maximum like this each side of exciting transformer that guaranteed is measured the simultaneity of numerical value, has guaranteed that each side of exciting transformer closes facies analysis result's accuracy.
The conclusion of deriving according to algorithm of deriving with practical conditions is consistent fully with the factual error situation.
Claims (5)
1. method that is used to realize that exciting transformer differential protecting CT circuit connection is analyzed is characterized in that: may further comprise the steps:
1) draw the correct vector plot in this loop: collect this loop meritorious, idle send, be subjected to situation; Draw the correct vector plot in this loop with reference voltage;
2) draw the vector plot of actual measurement with reference voltage;
3) export this circuit connection correctness analysis result:
3.1) vector plot and the step 2 that the step 1) gained is correct) vector plot of gained actual measurement compares to judge the correctness of wiring;
3.2) if judge to such an extent that wiring wiring erroneous results then corrects wiring according to analysis, judged result;
3.3) if judge to such an extent that wiring wiring result correctly then exports this circuit connection correctness analysis result;
4) finish all measurements of closing facies unit wiring correctness, judgement;
5) adopt the simultaneously-measured method of each side homophase to draw the vector plot of each side CT selected item of exciting transformer differential protection loop with reference voltage; According to exciting transformer and parameter thereof exciting transformer differential protecting CT loop measured value is converted.
6) analyze, judge and close the facies analysis result, and the output analysis result then checks that according to analysis result CT draws polarity and variation if close the facies analysis erroneous results; If closing the facies analysis result correctly then exports exciting transformer and closes phase correctness analysis result.
2. a kind of method that is used to realize the analysis of exciting transformer differential protecting CT circuit connection according to claim 1, it is characterized in that: the specific implementation method of the above step 5) is:
5.1) calculate the coefficient of balance of each winding of exciting transformer;
5.2) according to the convert current effective value of this winding of the coefficient of balance of each winding of exciting transformer;
5.3) all current phases are deducted with the measurement loop is the phase power angle of reference;
5.4) judge whether reference voltage is Ua, if then direct execution in step 2.5); If not then reference voltage being converted to behind the Ua execution in step 2.5 again);
5.5) if exciting transformer differential protecting CT loop is analyzed; then to carry out causing the compensation of each side primary current phase difference, preserve parameter and execution in step 6 after converting then) owing to the difference of a winding connection mode of each side of exciting transformer.
3. a kind of method that is used to realize that exciting transformer differential protecting CT circuit connection is analyzed according to claim 2 is characterized in that: the computing method for the coefficient of balance of exciting transformer differential protection described step 5.1) are:
5.1.1) calculate the secondary rated current of each winding;
Formula one:
Have according to formula one:
Formula two is then arranged:
Wherein, S is the capacity of exciting transformer;
U is a winding primary side rated line voltage;
I is a winding primary side rated current;
Ie is a winding secondary rated current;
Nct is a winding CT no-load voltage ratio;
Calculate the secondary rated current of each winding according to above-mentioned formula two;
5.1.2) one coefficient of balance establishing a rated current maximum of each winding is 1, converts the coefficient of balance of other windings;
5.1.3) coefficient of balance should be smaller or equal to 4, if having in each lateral balance coefficient greater than 4, so it are made as 4, again the coefficient of balance of other windings is changed.
4. a kind of method that is used to realize the analysis of exciting transformer differential protecting CT circuit connection according to claim 3, it is characterized in that: the computing method of exciting transformer differential protection coefficient of balance are described step 5.2):
Become example with two circles, have according to formula two:
Wherein, Ihe is the high-pressure side rated current; Uh is the high-pressure side rated voltage; Nhct is a high-pressure side CT no-load voltage ratio; Ile is the low-pressure side rated current; Ul is the low-pressure side rated voltage; Nlct is a low-pressure side CT no-load voltage ratio; With the high-pressure side is benchmark, calculates the coefficient of balance of other windings, and promptly establishing high-pressure side coefficient of balance Kh is 1, then low-pressure side coefficient of balance Kl=(Uh * Nhct)/(Ul * Nlct); The coefficient of balance of each winding in the time of in like manner can calculating three circle changes or other situation.
5. a kind of method that is used to realize the analysis of exciting transformer differential protecting CT circuit connection according to claim 4, it is characterized in that: the wiring state according to output is corrected error situation.The wiring state of its each phase has respectively for certain winding or linkage unit: A has mutually: the A phase connection is correct, A joins instead with B, A joins instead with C, A phase polarity connects instead, A joins with B, and anti-and current B phase polarity connects instead, A joins anti-with C and current C phase polarity connects instead; B has mutually: the B phase connection is correct, B joins instead with A, B joins instead with C, B joins with A, and anti-and current A phase polarity connects instead, B phase polarity connects instead, B joins anti-with C and current C phase polarity connects instead; C has mutually: the C phase connection is correct, C joins instead with A, C joins instead with B, C joins with A, and anti-and current A phase polarity connects instead, C joins with B, and anti-and current B phase polarity connects instead, C phase polarity connects instead.
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| CN2009103115650A CN102095981A (en) | 2009-12-15 | 2009-12-15 | Method for realizing differential protection CT (Current Transformer) loop wiring analysis of exciting transformer |
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| CN2009103115650A CN102095981A (en) | 2009-12-15 | 2009-12-15 | Method for realizing differential protection CT (Current Transformer) loop wiring analysis of exciting transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108919030A (en) * | 2018-06-25 | 2018-11-30 | 北京京丰燃气发电有限责任公司 | A kind of selection method starting exciting transformer |
| CN109149519A (en) * | 2018-09-11 | 2019-01-04 | 国网江苏省电力有限公司泰州供电分公司 | A kind of distribution transforming differential protecting method based on petal type power grid |
| CN109283421A (en) * | 2018-10-16 | 2019-01-29 | 中铁电气化（武汉）设计研究院有限公司 | A kind of rail traction substation low-voltage is powered detection test method and device |
| CN113253155A (en) * | 2020-12-31 | 2021-08-13 | 国网河南省电力公司检修公司 | Load testing device and method for autotransformer |
-
2009
- 2009-12-15 CN CN2009103115650A patent/CN102095981A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108919030A (en) * | 2018-06-25 | 2018-11-30 | 北京京丰燃气发电有限责任公司 | A kind of selection method starting exciting transformer |
| CN109149519A (en) * | 2018-09-11 | 2019-01-04 | 国网江苏省电力有限公司泰州供电分公司 | A kind of distribution transforming differential protecting method based on petal type power grid |
| CN109283421A (en) * | 2018-10-16 | 2019-01-29 | 中铁电气化（武汉）设计研究院有限公司 | A kind of rail traction substation low-voltage is powered detection test method and device |
| CN109283421B (en) * | 2018-10-16 | 2024-02-09 | 中铁电气化（武汉）设计研究院有限公司 | Low-voltage power-on detection test method and device for railway traction substation |
| CN113253155A (en) * | 2020-12-31 | 2021-08-13 | 国网河南省电力公司检修公司 | Load testing device and method for autotransformer |
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Open date: 20110615 |