CN101592719A - Current transformer method of testing and system thereof - Google Patents
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Abstract
The method and the system thereof of current transformer test provided by the present invention, this system comprise transducer check device, PC and calibrating table top; The calibrating table top is provided with current transformer to be measured and test monitor screen, after finishing current transformer wiring to be measured on the calibrating table top, PC is provided with the calibrating scheme of current transformer, PC was downloaded the information of current transformer from marketing system after setting was finished, and the parameter of being examined and determine is resolved; Use PC control verification device to current transformer automatic Verification to be checked then; Obtain the verification result of the current transformer of PC control verification device automatic Verification then; Verification result with current transformer is uploaded to marketing system at last, thereby finishes the test of current transformer.The invention solves the existing inefficient technical matters of measuring current ct calibrating method, have advantages such as calibrating speed is fast, safe and reliable.
Description
[technical field]
The present invention relates to the transformer test field, a kind of current transformer method of testing and system thereof are provided.
[background technology]
Current transformer is a widely used metering outfit in electric system, and the quality of current transformer performance is directly connected to the reliability of metering system, and underproof current transformer also can influence the safe operation of electric system, therefore must examine and determine it.Traditional calibration method is to rely on the manual source that rises, and again with the method test mutual inductor of mutual inductor comparator than contrast differences value and angular difference value, and this method of testing once can only be examined and determine a mutual inductor, and calibrating efficient is also lower.
[summary of the invention]
In order to solve the existing inefficient technical matters of measuring current ct calibrating method, the invention provides a kind of current transformer method of testing and system.
To achieve these goals, technical scheme proposed by the invention is: a kind of method of current transformer test is provided, and this method of testing may further comprise the steps: the first step: current transformer to be measured is placed the calibrating table top; Second step:, finish primary connection and secondary connection by the no-load voltage ratio that indicates on the current transformer nameplate; The 3rd step: PC is provided with the calibrating scheme of current transformer; The 4th step: PC is downloaded the information of current transformer from marketing system, and the parameter of being examined and determine is resolved; The 5th step: PC control verification device is to current transformer automatic Verification to be checked; The 6th step: the verification result that obtains the current transformer of PC control verification device automatic Verification; The 7th step: the verification result of current transformer is uploaded to marketing system, thereby finishes the test of current transformer.
According to an optimal technical scheme of the present invention: in described the 5th step current transformer automatic Verification to be checked is comprised: the current transformer polarity check; The demagnetization test; Power frequency withstand test; The fundamental error test; And impedance experiments.
According to an optimal technical scheme of the present invention: described current transformer polarity check may further comprise the steps: one,, suppose that the polarity of mutual inductor is acquiescence polarity, acquiescence polarity is general identical with the polarity of standard mutual inductor, is " subtracting " polarity; Two,, add the primary current of 1%-20% for tested mutual inductor by the output of PC power controlling source; Three, ratio difference and the angular difference value that reads on the mutual-inductor tester changes, if ratio, thinks then that the polarity of tested mutual inductor is identical with the polarity of standard mutual inductor less than 40, is " subtracting " polarity, and the mutual inductor polarity inspection finishes; Otherwise, continue to carry out next step; Four, primary current is reduced to 0, Controlling Source output then adds an inverse current, and the amplitude of electric current is the 1%-20% of primary current; Five, read the variation of the ratio difference and the angular difference value of mutual-inductor tester once more, if ratio, thinks then that the polarity of tested mutual inductor is opposite with the polarity of standard mutual inductor less than 40%, be " additive polarity ", polarity check finishes; If ratio, is then thought the incorrect polarity of mutual inductor still greater than 40%.
According to an optimal technical scheme of the present invention: the demagnetization mode of described demagnetization test to current transformer is closed circuit demagnetization or open circuit demagnetization.
According to an optimal technical scheme of the present invention: described power frequency withstand test can carry out mutual inductor once over the ground, secondary over the ground, once to the withstand voltage test of secondary.At the trial, the high pressure of PC may command power source output 0-2000V, the lasting time is provided with by the calibrating scheme, can read leakage current by the dielectric voltage withstand instrument, and draw the withstand voltage test conclusion.
According to an optimal technical scheme of the present invention: described fundamental error test may further comprise the steps: step, by PC step-up error calibrating scheme, the scheme content comprises: the error testing point, and 1%-120% can be provided with arbitrarily; Station is provided with, and can select station 1-10; Power factor is provided with, and the power factor that can select is 1.0 and 0.8, and the payload of fully loaded and underloading is set, and the payload of native system support is 0VA-100VA; Before two steps, the beginning error test, system for the underproof mutual inductor of polarity check, will stop to examine and determine other project to the self-verifying of current transformer polarity; Before three steps, the beginning error test, system is according to the scheme setting test of demagnetizing alternatively; The demagnetization experiment can reduce because the adverse effect that remanent magnetism produces transformer error in the mutual inductor; Four steps, finish after above-mentioned-three steps an of step, system can current transformer be fully loaded with earlier, after carry out light duty test.
According to an optimal technical scheme of the present invention: whether described impedance and admittance test satisfy the requirement that connects impedance in the JJG 314-99 Verification of Measuring Current Transformer vertification regulation about secondary by the secondary connection impedance magnitude of each epi-position of individual inspiration with the line impedance of judging stage body.
According to an optimal technical scheme of the present invention: described demagnetization demagnetization mode under the situation that does not connect load, adds an inverse current for tested mutual inductor during for open circuit demagnetization experiment, and size of current is that the 1%-20% of primary current can be provided with arbitrarily.
According to an optimal technical scheme of the present invention: when described demagnetization mode is closed circuit demagnetization magnetic experiment, the mutual inductor verifying attachment is according to the nominal load of mutual inductor to be checked, the automatic switchover demagnetizing resistance is the fixedly multiple of rated resistance, add the inverse current of 1%-100% then for tested mutual inductor, electric current slowly reduces to 0 then, thereby finishes the demagnetization test.
According to an optimal technical scheme of the present invention: in described four steps current transformer is fully loaded with earlier, the concrete steps of carrying out light duty test then are as follows:
Step 6, when calibrating underloading error, system's automatic switchover load box is to underloading load, the process of repeating step one-step 5 then.
Another kind of technical scheme of the present invention is: a kind of current transformer test macro is provided, this system comprises PC, receives the transducer check device of PC, described system comprises that also being used to control transformer calibrating device realizes tested mutual inductor is finished polarity check, demagnetization test, error testing, power frequency withstand test, and draws the PC of experimental result; Be used to realize the primary connection of tested mutual inductor and the calibrating table top of secondary connection; Described calibrating table top is provided with current transformer to be measured.
According to an optimal technical scheme of the present invention: also be provided with the test monitor screen on the described calibrating table top.
According to an optimal technical scheme of the present invention: the no-load voltage ratio scope of described current transformer is 4-000A/5A.
According to an optimal technical scheme of the present invention: described current transformer is one or more.
Beneficial effect of the present invention is: only need primary connection, can finish 10 current transformers with no-load voltage ratio of the same type; By gear of automatic switchover standard mutual inductor, switch the calibration power factor, and after the automatic switchover load box payload, thereby realize full-automatic calibrating.System is furnished with the big screen LED monitor screen, and the testing person can be isolated with the transducer check device, can the protection test personal security at the calibrating current mutual inductor with high transforming ratio.System is furnished with acoustooptic alarm system, when mutual inductor is carried out power frequency withstand test, has sound and light alarm, with the alert operation of taking care.Can automatically examine and determine current transformer, primary connection can be examined and determine 10 mutual inductors simultaneously, can examine and determine all the calibrating projects in " JJG 313-94 Verification of Measuring Current Transformer vertification regulation ", and it is many to have the calibrating project, examines and determine fireballing characteristics.These method and system have improved the efficient of current transformer production test, have alleviated the work load of electric-power metering department.
[description of drawings]
Fig. 1 is current transformer method of testing process flow diagram in current transformer method of testing of the present invention and the system thereof;
Fig. 2 is a kind of current transformer test system structure synoptic diagram in current transformer method of testing of the present invention and the system thereof.
[embodiment]
Below in conjunction with accompanying drawing technical solutions of the utility model are described further:
See also shown in Figure 1ly, in step S101, current transformer to be measured placed on the calibrating table top; In step S102,, finish mutual inductor primary connection and secondary connection according to indicating on the current transformer nameplate; PC is provided with the ct calibrating scheme in step S103; PC is downloaded mutual inductor information from marketing system in step S104, resolves verification parameters; PC control verification device is to current transformer automatic Verification to be checked in step S105; In step S106, obtain test findings; In step S107, verification result is uploaded to marketing system.
Wherein, calibrating specifically comprises following substep to current transformer among the step S105: substep S105-1, carry out polarity check to current transformer; Substep S105-2 is to the current transformer test of demagnetizing; Substep S105-3 is to the current transformer power frequency withstand test; Substep S105-4 carries out the fundamental error test to current transformer; Substep S105-5 carries out impedance experiments to current transformer; Substep S105-1 and step S105-5 be in no particular order the order.
In substep S105-1, the current transformer polarity check may further comprise the steps:
A supposes that the polarity of mutual inductor is acquiescence polarity, and acquiescence polarity is general identical with the polarity of standard mutual inductor, is " subtracting " polarity;
B:, add the primary current of 1%-20% for tested mutual inductor by the output of PC power controlling source;
C: the ratio difference and the angular difference value that read on the mutual-inductor tester change, if ratio, thinks then that the polarity of tested mutual inductor is identical with the polarity of standard mutual inductor less than 40, are " subtracting " polarity, and the mutual inductor polarity inspection finishes; Otherwise, continue to carry out next step;
D: primary current is reduced to 0, and Controlling Source output then adds an inverse current, and the amplitude of electric current is the 1%-20% of primary current;
E: read the variation of the ratio difference and the angular difference value of mutual-inductor tester once more, if ratio, thinks then that the polarity of tested mutual inductor is opposite with the polarity of standard mutual inductor less than 40%, be " additive polarity ", polarity check finishes; If ratio, is then thought the incorrect polarity of mutual inductor still greater than 40%.
Connect anti-mutual inductor for polarity, the embodiment of the invention can normally be examined and determine mutual inductor according to " reversed polarity ", and need not manually to exchange secondary connection; For the mutual inductor of incorrect polarity, the embodiment of the invention will stop to examine and determine other project.
In substep S105-2, the demagnetization mode that the demagnetization of current transformer is tested is divided into closed circuit demagnetization and open circuit demagnetization; When the demagnetization mode is tested for the open circuit demagnetization, under the situation that does not connect load, add an inverse current for tested mutual inductor, size of current is that the 1%-20% of primary current can be provided with arbitrarily.When the demagnetization mode is closed circuit demagnetization experiment, the mutual inductor verifying attachment is according to the nominal load of mutual inductor to be checked, and the automatic switchover demagnetizing resistance is the fixedly multiple of rated resistance, adds the inverse current of 1%-100% then for tested mutual inductor, electric current slowly reduces to 0 then, thereby finishes the demagnetization test.Wherein, the demagnetization experiment can reduce owing to the influence of the remanent magnetism in the current transformer to mutual inductor ratio and angular difference, and to improve the reliability of test, this test event can be done by user's choosing.
In substep S105-3, the current transformer power frequency withstand test can carry out mutual inductor once over the ground, secondary over the ground, once to the withstand voltage test of secondary.At the trial, the high pressure of PC may command power source output 0-2000V, the lasting time is provided with by the calibrating scheme, can read leakage current by the dielectric voltage withstand instrument, and draw the withstand voltage test conclusion.In the withstand voltage test process; system also can be furnished with acoustooptic alarm system; when withstand voltage test is carried out; HT pilot can light, and alert is taken care, simultaneously; also is furnished with scram button; when abnormal conditions appear in withstand voltage test, can press scram button fast and finish withstand voltage test, to protect this test macro safety.
In substep S105-4, the test of current transformer fundamental error may further comprise the steps:
The mutual inductor ratio scope that the fundamental error test can be examined and determine is: 4.0A ~ 3000A, can examine and determine the current transformer that secondary current is 5A or 1A, the power factor that can test is 1.0 or 0.8, can test the error under fully loaded and underloading condition, the load range that can test is: 0VA ~ 100VA, the percentage range that can test is 1% ~ 120%, and test point and test parameter can be adjusted by the plan of establishment in the PC software.Wherein the basic procedure of fundamental error experiment is as follows:
A, by PC step-up error calibrating scheme, the scheme content comprises: the error testing point, 1%-120% can be provided with arbitrarily; Station is provided with, and can select station 1-10; Power factor is provided with, and the power factor that can select is 1.0 and 0.8, and the payload of fully loaded and underloading is set, and the payload of native system support is 0VA-100VA;
B, before the beginning error test, system for the underproof mutual inductor of polarity check, will stop to examine and determine other project to the self-verifying of current transformer polarity;
C, before the beginning error test, system is according to the scheme setting test of demagnetizing alternatively; The demagnetization experiment can reduce because the adverse effect that remanent magnetism produces transformer error in the mutual inductor;
D finishes after the above-mentioned steps 1-step 3, and system can current transformer be fully loaded with earlier, after carry out light duty test.
Test detailed process in the steps d is as follows:
Steps d .1, the no-load voltage ratio of switching standards current transformer is consistent with the no-load voltage ratio of tested current transformer on transformer calibrating device;
Steps d .2, gating will be examined the station relay of current transformer automatically, disconnects the mutual inductor of other station;
Steps d .3 makes transformer calibrating device power controlling source output primary current, and electric current slowly increases, and outputs to 1%, 5%, 20%, 100% and 120% of rated primary current successively;
Steps d .4 writes down the ratio difference and the angular difference value of each test point by mutual-inductor tester;
Steps d .5 reads the ratio difference and the angular difference value of each test point with PC from mutual-inductor tester, and draws the error test conclusion according to the accuracy class of tested mutual inductor;
Steps d .6, when calibrating underloading error, system's automatic switchover load box is to the underloading load, then the repeating step process of steps d .5 d.1-.
When calibrating underloading error, system can automatically switch load box to the underloading load, repeats then d.1 ~ d.5 process;
The process of this transformer error experiment is automatically carried out; And be furnished with monitor screen, the percent value in the time of can the far-end observation experiment, than difference and angular difference value makes the operator protect operating personnel's safety to greatest extent away from the check table top.
Whether the current transformer impedance experiments satisfies the requirement that connects impedance in " JJG 314-99 Verification of Measuring Current Transformer vertification regulation " about secondary by the secondary connection impedance magnitude of each epi-position of individual inspiration with the line impedance of judging stage body.
After finishing calibrating, finally obtain the verification result of the current transformer of PC control verification device automatic Verification; The software kit of system is preserved the test result to mutual inductor automatically, diversified query manipulation interface is provided, can carry out combined queries according to a plurality of conditions such as calibrating date, mutual inductor type, model, manufacturing firms, also can print verification result and generate form.
At last the current transformer verification result that obtains is uploaded to marketing system, thereby finishes the test of current transformer.PC software is furnished with and power marketing system interface software, the verification result of mutual inductor can be uploaded to the power marketing system, shares the calibrating data with marketing system.
PC is provided with current transformer calibrating scheme, and 1-10 current transformer only of the same type is tested according to the testing program that is provided with, and draw test findings, also can carry out transformer test automatically, and only need primary connection can finish all calibrating projects, greatly improved the work efficiency of power department.
Referring to Fig. 2,
In the current transformer test macro provided by the invention, comprise transducer check device 1, be used to control transformer calibrating device 1 and realize tested mutual inductor is finished polarity check, demagnetization test, error testing, power frequency withstand test, and draw the PC 2 of experimental result; Be used to realize the primary connection of tested mutual inductor and the calibrating table top 3 of secondary connection; Calibrating table top 3 is provided with 1-10 current transformer 4 to be measured and a test monitor screen 5.By primary connection, can finish the test of the current transformer 4 of 10 same types, greatly improved the work efficiency of power department.This system can have power frequency withstand test, current transformer demagnetization test, mutual inductor polarity to judge, detect test, the test of current transformer fundamental error to the project of transformer test, and current transformer impedance experiments, the current transformer 4 no-load voltage ratio scopes of calibrating are 4 ~ 3000A/5A, also can examine and determine the current transformer that secondary is 1A; The embodiment of the invention can the calibration power factor be 0.8 and 1.0 current transformer, and the loading range that can examine and determine is: 0.00VA ~ 100VA, therefore, this system can detect the current transformer that the domestic overwhelming majority uses always, has very strong adaptability.PC 2 is provided with the calibrating experiment parameter and the calibrating scheme of mutual inductor to be checked, automatically finishes the ct calibrating project by control mutual inductor verifying attachment, draws conclusion (of pressure testing) at last; After PC 2 is finished analysis to experimental result, set up the interface with the power marketing system, experimental result is uploaded to marketing system, realize data sharing with this test macro.PC 2 also is provided with the interface routine with the power marketing system, and by the parameter information of this interface routine from power marketing system downloads to-be-tested transformer, obtains the verification parameters of to-be-tested transformer.Multiple management information system (the Management Information System of configuration, MIS) interface protocol is supported domestic most of power marketing system software, can download mutual inductor information from marketing system, upload the calibrating data, thereby make this system have very strong adaptability.
This system can also manage scheme, can be provided with whether to carry out the mutual inductor visual examination; Be provided with and whether carry out power frequency withstand test, and the withstand voltage test value can be made as 0-2000V, the withstand voltage test time can be made as 0-99 second; Be provided with and whether carry out insulation resistance test and admittance test; Be provided with and whether carry out the test of mutual inductor fundamental error, and step-up error calibrating point.The verification parameters of these test events can be combined into different transformer test schemes, when testing, only gets final product with accessing the testing scheme that pre-sets at every turn, thereby has simplified the parameter setting up procedure before the calibrating greatly.
In the foregoing description, only the present invention has been carried out exemplary description, but those skilled in the art can design various embodiments according to different actual needs under the situation of the scope and spirit that do not break away from the present invention and protected.
Claims (10)
1. current transformer method of testing is characterized in that: the method for described current transformer test may further comprise the steps:
A: current transformer to be measured is placed the calibrating table top;
B: finish primary connection and secondary connection by the no-load voltage ratio that indicates on the current transformer nameplate;
The C:PC machine is provided with the calibrating scheme of current transformer;
The D:PC machine is downloaded the information of current transformer from marketing system, and the parameter of being examined and determine is resolved;
E:PC machine control verification device is to current transformer automatic Verification to be checked;
F: the verification result that obtains the current transformer of PC control verification device automatic Verification;
H: the verification result of current transformer is uploaded to marketing system, thereby finishes the test of current transformer.
2. current transformer method of testing according to claim 1 is characterized in that: in the described step e current transformer automatic Verification to be checked is comprised: the current transformer polarity check; The demagnetization test; Power frequency withstand test; The fundamental error test; And impedance experiments.
3. current transformer method of testing according to claim 2 is characterized in that: described current transformer polarity check may further comprise the steps:
E11: the polarity of supposing mutual inductor is acquiescence polarity, and acquiescence polarity is general identical with the polarity of standard mutual inductor, is " subtracting " polarity;
E12:, add the primary current of 1%-20% for tested mutual inductor by the output of PC power controlling source;
E13: the ratio difference and the angular difference value that read on the mutual-inductor tester change, if ratio, thinks then that the polarity of tested mutual inductor is identical with the polarity of standard mutual inductor less than 40, are " subtracting " polarity, and the mutual inductor polarity inspection finishes; Otherwise, continue to carry out next step;
E14: primary current is reduced to 0, and Controlling Source output then adds an inverse current, and the amplitude of electric current is the 1%-20% of primary current;
E15:, the variation of reading the ratio difference and the angular difference value of mutual-inductor tester once more, if ratio less than 40% then think that the polarity of tested mutual inductor is opposite with the polarity of standard mutual inductor, is " additive polarity ", polarity check finishes; If ratio, is then thought the incorrect polarity of mutual inductor still greater than 40%.
4. current transformer method of testing according to claim 2 is characterized in that:
The described demagnetization mode that the demagnetization of current transformer is tested is closed circuit demagnetization or open circuit demagnetization;
When described demagnetization mode is tested for the open circuit demagnetization, under the situation that does not connect load, add an inverse current for tested mutual inductor, size of current is that the 1%-20% of primary current can be provided with arbitrarily;
When described demagnetization mode is closed circuit demagnetization experiment, the mutual inductor verifying attachment is according to the nominal load of mutual inductor to be checked, and the automatic switchover demagnetizing resistance is the fixedly multiple of rated resistance, adds the inverse current of 1%-100% then for tested mutual inductor, electric current slowly reduces to 0 then, thereby finishes the demagnetization test.
5. current transformer method of testing according to claim 2 is characterized in that:
Described power frequency withstand test can carry out mutual inductor once over the ground, secondary over the ground, once to the withstand voltage test of secondary, at the trial, the high pressure of PC may command power source output 0-2000V, the time that continues is provided with by the calibrating scheme, can read leakage current by the dielectric voltage withstand instrument, and draw the withstand voltage test conclusion.
6. current transformer method of testing according to claim 2 is characterized in that:
Described fundamental error test may further comprise the steps:
E21: by PC step-up error calibrating scheme, the scheme content comprises: the error testing point, and 1%-120% can be provided with arbitrarily; Station is provided with, and can select station 1-10; Power factor is provided with, and the power factor that can select is 1.0 and 0.8, and the payload of fully loaded and underloading is set, and the payload of native system support is 0VA-100VA:
E22: before the beginning error test, system for the underproof mutual inductor of polarity check, will stop to examine and determine other project to the self-verifying of current transformer polarity;
E23: before the beginning error test, system is according to the scheme setting test of demagnetizing alternatively; The demagnetization experiment can reduce because the adverse effect that remanent magnetism produces transformer error in the mutual inductor;
E24: carry out after the test of step e 21-E23, system can be fully loaded with earlier current transformer, after carry out light duty test.
7. current transformer method of testing according to claim 2 is characterized in that:
Whether described impedance experiments satisfies the requirement that connects impedance in the JJG 314-99 Verification of Measuring Current Transformer vertification regulation about secondary by the secondary connection impedance magnitude of each epi-position of individual inspiration with the line impedance of judging stage body.
8. current transformer method of testing according to claim 6 is characterized in that:
In the described step e 24 current transformer is fully loaded with earlier, the concrete steps of carrying out light duty test then are as follows:
E241, the no-load voltage ratio of switching standards current transformer is consistent with the no-load voltage ratio of tested current transformer on transformer calibrating device;
E242, gating will be examined the station relay of current transformer automatically, disconnects the mutual inductor of other station;
E243 makes transformer calibrating device power controlling source output primary current, and electric current slowly increases, and outputs to 1%, 5%, 20%, 100% and 120% of rated primary current successively;
E244 writes down the ratio difference and the angular difference value of each test point by mutual-inductor tester;
E245 reads the ratio difference and the angular difference value of each test point with PC from mutual-inductor tester, and draws the error test conclusion according to the accuracy class of tested mutual inductor;
E246, when calibrating underloading error, system's automatic switchover load box is to underloading load, the process of repeating step E241-step e 245 then.
9. current transformer test macro, described current transformer test macro comprises transducer check device (1), it is characterized in that: described current transformer test macro comprises that also being used to control transformer calibrating device realizes tested mutual inductor is finished polarity check, demagnetization test, error testing, power frequency withstand test, and draws the PC (2) of experimental result; Be used to realize the primary connection of tested mutual inductor and the calibrating table top (3) of secondary connection; Described calibrating table top (3) is provided with current transformer to be measured (4) and test monitor screen (5).
10. according to the described current transformer test macro of claim 9, it is characterized in that:
The no-load voltage ratio scope of described current transformer (4) is 4-3000A/5A or 4-3000A/1A; Described current transformer (4) is one or more.
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| CN2009101084357A CN101592719B (en) | 2009-06-30 | 2009-06-30 | Method and system for testing current transformer |
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| CN2009101084357A CN101592719B (en) | 2009-06-30 | 2009-06-30 | Method and system for testing current transformer |
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| CN109407036A (en) * | 2018-12-29 | 2019-03-01 | 太原山互科技有限公司 | A kind of full-automatic calibrating installation of batch current transformer based on PLC control |
| CN110308415A (en) * | 2019-07-05 | 2019-10-08 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | The error compensating method and device of electric energy metered system |
| CN110687492A (en) * | 2019-08-21 | 2020-01-14 | 国网湖北省电力有限公司计量中心 | Method and system for monitoring detection quality of automatic verification system of low-voltage current transformer on line |
| CN111812576A (en) * | 2020-07-22 | 2020-10-23 | 积成电子股份有限公司 | System and method for adjusting transformer board of relay protection device |
| CN113030832A (en) * | 2021-03-22 | 2021-06-25 | 苏州电器科学研究院股份有限公司 | Device and method for detecting composite error of current transformer |
| CN114814658A (en) * | 2022-05-07 | 2022-07-29 | 山东送变电工程有限公司 | Timing polarity-limiting tester |
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2009
- 2009-06-30 CN CN2009101084357A patent/CN101592719B/en not_active Expired - Fee Related
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| CN109342988A (en) * | 2018-12-20 | 2019-02-15 | 广东电网有限责任公司 | A kind of remanence of current transformer influence test method, apparatus and system |
| CN109407036A (en) * | 2018-12-29 | 2019-03-01 | 太原山互科技有限公司 | A kind of full-automatic calibrating installation of batch current transformer based on PLC control |
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| CN110308415A (en) * | 2019-07-05 | 2019-10-08 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | The error compensating method and device of electric energy metered system |
| CN110687492A (en) * | 2019-08-21 | 2020-01-14 | 国网湖北省电力有限公司计量中心 | Method and system for monitoring detection quality of automatic verification system of low-voltage current transformer on line |
| CN111812576A (en) * | 2020-07-22 | 2020-10-23 | 积成电子股份有限公司 | System and method for adjusting transformer board of relay protection device |
| CN113030832A (en) * | 2021-03-22 | 2021-06-25 | 苏州电器科学研究院股份有限公司 | Device and method for detecting composite error of current transformer |
| CN114814658A (en) * | 2022-05-07 | 2022-07-29 | 山东送变电工程有限公司 | Timing polarity-limiting tester |
| CN114814658B (en) * | 2022-05-07 | 2024-02-06 | 山东送变电工程有限公司 | Timing polarity tester |
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