GB2556610A - Test system for anti-DC component and even-order harmonic of current transformer - Google Patents
Test system for anti-DC component and even-order harmonic of current transformer Download PDFInfo
- Publication number
- GB2556610A GB2556610A GB1804682.1A GB201804682A GB2556610A GB 2556610 A GB2556610 A GB 2556610A GB 201804682 A GB201804682 A GB 201804682A GB 2556610 A GB2556610 A GB 2556610A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current transformer
- wave
- current
- wave rectification
- impedance matching
- 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
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- 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
- G01R31/62—Testing of transformers
Abstract
A test system for an anti-DC component and an even-order harmonic of a current transformer. The test system comprises a big current generator, a standard current transformer (8), a half-wave rectification apparatus, an impedance matching apparatus, and a half-wave transformer calibrator (9). A primary side of the testing system comprises a first half-wave rectification apparatus (1), a second half-wave rectification apparatus (2), and a first impedance matching apparatus (5), the first half-wave rectification apparatus (1) and the first impedance matching apparatus (5) in series connection being connected in parallel to the second half-wave rectification apparatus (2) and a tested current transformer (7) that are also connected in series. A secondary side of the test system comprises a third half-wave rectification apparatus (3), a fourth half-wave rectification apparatus (4), and a second impedance matching apparatus (6), the fourth half-wave rectification apparatus (4), the second impedance matching apparatus (6), and a standard current transformer (8) being connected in series to the third half-wave rectification apparatus (3), and the big current generator being connected to the standard current transformer (8).
Description
(71) Applicant(s):
China Electric Power Research Institute Company Limited
No. 15 Xiaoying East Road, Qinghe,
Haidian District 100031, Beijing, China, China
State Grid Corporation of China No.86 Chang'an Avenue West,
Xicheng District 100031, Beijing, China (continued on next page) (51) INT CL:
G01R 31/02 (2006.01) (56) Documents Cited:
CN 104569904 A CN 103675749 A CN 102520382 A CN 101533082 A
G01R 35/02 (2006.01)
CN 104237837 A CN 102928802 A CN 102156273 A US 8421444 B2 (58) Field of Search:
INT CL G01R
Other: CNKI, CNABS, CNTXT, VEN (54) Title of the Invention: Test system for anti-DC component and even-order harmonic of current transformer Abstract Title: Test system for anti-DC component and even-order harmonic of current transformer (57) A test system for an anti-DC component and an evenorder harmonic of a current transformer. The test system comprises a big current generator, a standard current transformer (8), a half-wave rectification apparatus, an impedance matching apparatus, and a half-wave transformer calibrator (9). A primary side of the testing system comprises a first half-wave rectification apparatus (1), a second half-wave rectification apparatus (2), and a first impedance matching apparatus (5), the first halfwave rectification apparatus (1) and the first impedance matching apparatus (5) in series connection being connected in parallel to the second half-wave rectification apparatus (2) and a tested current transformer (7) that are also connected in series. A secondary side of the test system comprises a third half-wave rectification apparatus (3), a fourth half-wave rectification apparatus (4), and a second impedance matching apparatus (6), the fourth half-wave rectification apparatus (4), the second impedance matching apparatus (6), and a standard current transformer (8) being connected in series to the third half-wave rectification apparatus (3), and the big current generator being connected to the standard current transformer (8).
AC
it «2 x·
-5-/IS7 ..
- Tx
¥
Si <10
Τχ K To a i
First half-wave rectification apparatus
Second half-wave rectification apparatus
Third half-wave rectification apparatus
Fourth half-wave rectification apparatus
First impedance matching apparatus
Second impedance matching apparatus
Tested current transformer
Standard current transformer
Half-wave transformer calibrator
Current transformer load
GB 2556610 A continuation (72) Inventor(s):
Penghe Zhang Yang Xue Yinghui Xu Erwei Shi Bing Zhao Chuning Peng Chenglin Qin Yue Zhao Chen Tan Da Cheng Yatao Wang Xiangyu Yuan (74) Agent and/or Address for Service:
Mathys & Squire LLP
The Shard, 32 London Bridge Street, LONDON, SE1 9SG, United Kingdom
AC
FIG. 1
1/2
Current waveform
Direct current and even harmonic test
Period/ms
FIG. 2
2/2
TEST SYSTEM FOR ANTI-DC COMPONENT AND EVENORDER HARMONIC OF CURRENT TRANSFORMER
TECHNICAL FIELD
The disclosure relates to the field of power equipment testing, and particularly to a testing system for testing resistance of a current transformer to direct current components and even harmonics.
BACKGROUND
Along with rapid development of a smart grid, application of smart electric meters is rapidly increased. Before being used, a smart electric meter is required to be tested by a testing department to be qualified for use. As a key link of electric energy metering, not only is metering performance of a smart electric meter required to meet a requirement, but also its safety and reliability are required to be ensured.
A current transformer is a key sampling component of a three-phase electric meter, and its sampling accuracy has a direct impact on the accuracy of electric energy metering. For a three-phase direct access type electric meter, a primary side of a current transformer for internal sampling is directly connected with a power grid, and thus its capability of resisting direct current components and even harmonics is required to be tested.
However, in a present testing solution for testing a capability of resisting direct current components and even harmonics of a current transformer, it is impossible to accurately measure an error of the current transformer under influence of direct current components and even harmonics.
SUMMARY
In order to solve the existing technical problem, an embodiment of the disclosure provides a testing system for testing resistance of a current transformer to direct current components and even harmonics.
The technical solution of the embodiment of the disclosure is implemented as follows.
The embodiment of the disclosure provides a testing system for testing resistance of a current transformer to direct current components and even harmonics, the testing system including a high-current generator, a standard current transformer, half-wave rectification devices, impedance matching devices and a half-wave transformer calibrator, wherein a primary side of the testing system includes a first half-wave rectification device, a second half-wave rectification device and a first impedance matching device; the first half-wave rectification device and the first impedance matching device connected in series are connected in parallel with the second half-wave rectification device and tested current transformer which are connected in series;
a secondary side of the testing system includes a third half-wave rectification device, a fourth half-wave rectification device and a second impedance matching device; the fourth half-wave rectification device, the second impedance matching device, and the standard current transformer are connected in series to the third halfwave rectification device; and the high-current generator is connected with the standard current transformer.
In the solution, the high-current generator converts a low current into a high current.
In the solution, a 50Hz sinusoidal current wave of a period passes through a primary side of the standard current transformer, and a secondary side accesses the fourth half-wave rectification device and the second impedance matching device to input a half-wave current of the secondary side into the half-wave transformer calibrator; and the standard current transformer is a 0.001-level current transformer.
In the solution, the half-wave rectification devices are configured to convert a sinusoidal wave of a period into a sinusoidal wave of a half period.
In the solution, the impedance matching devices may implement automatic matching of impedances in a circuit to keep impedances in two branch circuits of the tested current transformer consistent and keep impedances in two branch circuits of the standard current transformer consistent; the two branch circuits of the tested current transformer include: a first branch circuit and a second branch circuit; the first branch circuit includes the first impedance matching device and the first half-wave rectification device, and the second branch circuit includes a primary side of the tested current transformer and the second half-wave rectification device; the two branch circuits of the standard current transformer include: a third branch circuit and a fourth branch circuit; the third branch circuit includes a secondary side of the tested current transformer and the third half-wave rectification device, and the fourth branch circuit includes the second impedance matching device and the fourth half-wave rectification device;
the first impedance matching device may implement automatic matching of primary-side impedances of the tested current transformer; and the second impedance matching device may implement automatic matching of secondary-side impedances of the standard current transformer.
In the solution, a positive half wave of a 50Hz sinusoidal current wave of a period passes through the primary side of the tested current transformer, and a halfwave current of the secondary side is input into the half-wave transformer calibrator.
In the solution, the half-wave transformer calibrator compares current half waves of the standard current transformer and the tested current transformer to obtain a ratio error and a phase error by virtue of an error measurement type principle.
Compared with a conventional art, the embodiment of the disclosure has the following beneficial effects.
According to the embodiment of the disclosure, a test on direct current component and even harmonic resistance of the current transformer for an electric meter may be implemented, and influence of a half wave on the ratio error and phase error of the current transformer may be accurately evaluated. Automatic matching of impedance of a measurement loop may be implemented, influence of impedance unbalance on a measurement result may be reduced, and testing efficiency is improved.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a structure diagram of a testing system for testing resistance of a current transformer in an electric meter to direct current components and even harmonics according to an embodiment of the disclosure.
FIG. 2 is a waveform of a half-wave current according to an embodiment of the disclosure.
DETAILED DESCRIPTIN
Specific implementation modes of the disclosure will be further described below in combination with the drawings in detail.
An existing current transformer checking method is mainly implemented by adopting a method of comparing a tested current transformer with a standard current transformer. Moreover, the existing current transformer checking method may only perform error checking for a full sinusoidal wave, and may not ensure accurate measurement for a direct current component because a principle of the standard current transformer is electromagnetic induction (a transfer characteristic of the current transformer) and the current transformer may be saturated when the direct current component and an even harmonic pass through the standard current transformer. Therefore, it is necessary to propose a method for detecting a ratio error and phase error of a current transformer for an electric meter under a direct current component and even harmonic condition, to implement a test on direct current component and even harmonic resistance of the current transformer.
On such a basis, in each embodiment of the disclosure: a high-current generator provides a same primary current for a standard current transformer and a tested current transformer, a secondary-side current of the standard current transformer passes through a standard loop of a half-wave transformer calibrator, meanwhile, a secondary-side current difference of the tested current transformer and the standard current transformer flows into a difference loop of the half-wave transformer calibrator, and then the half-wave transformer calibrator reads error data of a ratio error and a phase error.
FIG. 1 is a structure diagram of a system for testing resistance of a current transformer to direct current components and even harmonics according to an embodiment of the disclosure. As shown in FIG. 1, the system includes a high-current generator AC, a standard current transformer 8, half-wave rectification devices, impedance matching devices and a half-wave transformer calibrator 9, wherein a primary side of the testing system includes a first half-wave rectification device 1, a second half-wave rectification device 2 and a first impedance matching device 5; the first half-wave rectification device 1 and the first impedance matching device 5 connected in series are connected in parallel with the second half-wave rectification device 2 and tested current transformer 7 which are also connected in series;
a secondary side of the testing system includes a third half-wave rectification device 3, a fourth half-wave rectification device 4 and a second impedance matching device 6; the fourth half-wave rectification device 4, the second impedance matching device 6, the standard current transformer 8 and the third half-wave rectification device 3 are connected in series; and the high-current generator AC is connected with the standard current transformer 8.
Wherein, the first impedance matching device 5 may implement automatic matching of primary-side impedance of the tested current transformer 7; and the second impedance matching device 6 may implement automatic matching of secondary-side impedance of the standard current transformer 8.
According to the testing system provided by the embodiment of the disclosure, the high-current generator AC converts a low current into a high current (for example, a 10A current is increased to a 100A current) for output and connection to a primary' side of the standard current transformer 8. At this moment, the current passing through the standard current transformer 8 is an alternating current full wave, and after the current passes through the standard current transformer 8, a circuit is divided into two branch circuits (a first branch circuit and a second branch circuit).
The first branch circuit includes: the first impedance matching device 5 and the first half-wave rectification device 1, and the second branch circuit includes: a primary side of the tested current transformer 7 and the second half-wave rectification device 2.
The first impedance matching device 5 in the first branch circuit may automatically implement impedance matching to ensure that impedances of the two branch circuits are equal, the first half-wave rectification device 1 ensures that a current input into the first branch circuit is a negative half wave, and the second halfwave rectification device 2 ensures that a current input into the second branch circuit is a positive half wave, as shown in FIG. 2.
The circuit (the first half-wave rectification device 1, the second half-wave rectification device 2 and the first impedance matching device 5) connected to the primary side of the tested current transformer 7 ensures that the current input into the primary side of the standard current transformer 8 is a full wave. Meanwhile, it is ensured that a current input into the tested current transformer 7 is a positive half wave. A secondary side of the standard current transformer 8 is rectified and output a positive half to the transformer calibrator 9, and then compared with a half wave output by a secondary side of the tested current transformer 7 for error measurement, thereby meeting a direct current component and event harmonic resistance testing requirement.
After a rectification action of the fourth half-wave rectification device 4, the current (the positive half wave) (as shown in FIG. 2) output by the secondary side of the standard current transformer 8 is opposite to a direct (a negative half wave) of the current (under a rectification action of the first half-wave rectification device 1) output by the primary side, wherein the current output by the secondary side of the standard current transformer 8 accesses a current transformer load 10, and then the circuit is divided into two branch circuits (a third branch circuit and a fourth branch circuit).
The impedance matching devices automatically match impedances in the circuit to keep impedances in the two branch circuits of the tested current transformer consistent and keep impedances in the two branch circuits of the standard current transformer 8 consistent. The third branch circuit includes the secondary side of the tested current transformer 7 and the third half-wave rectification device 3, and the fourth branch circuit includes the second impedance matching device 6 and the fourth half-wave rectification device 4.
The second impedance matching device 6 implements automatic matching of the secondary-side impedance of the standard current transformer 8.
Here, as a testing part, the current transformer load 10 may not have a resistance higher than secondary rated impedance of the standard current transformer 8.
The half-wave current of the tested current transformer 7 accesses a Tx end of the half-wave transformer calibrator 9, the half-wave current, obtained after the full wave of the standard current transformer 8 passes through the second impedance matching device 6 and the fourth half-wave rectification device 4, accesses a To end of the half-wave transformer calibrator 9, and a current difference of the Tx end and the To end accesses a K end of the half-wave transformer calibrator 9 (the current difference of the Tx end and the To end may be calculated in the half-wave transformer calibrator 9). The half-wave transformer calibrator 9 compares secondaryside current half waves of the standard current transformer 8 and the tested current transformer 7 to obtain the ratio error and the phase error by virtue of an error measurement type principle.
In other words, the half-wave transformer calibrator 9 reads error data of the ratio error and the phase error.
The testing system provided by the embodiment of the disclosure compares the tested current transformer 7 with the standard current transformer 8 having the same current ratio, and the half-wave transformer calibrator 9 compares the secondary-side current half waves of the standard current transformer 8 and the tested current transformer 7 to obtain the ratio error and the phase error by virtue of the error measurement type principle. Specifically, the high-current generator AC provides the same primary current for the standard current transformer 8 and the tested current transformer 7, the secondary-side current of the standard current transformer 8 passes through a standard loop of the half-wave transformer calibrator 9, meanwhile, the secondary-side current difference of the tested current transformer 7 and the standard current transformer 8 flows into a difference loop of the half-wave transformer calibrator 9, and then the half-wave transformer calibrator 9 reads the error data.
In an embodiment, a 50Hz sinusoidal current wave of a period (a complete normal power-frequency current wave) may pass through the primary side of the standard current transformer 8, and the secondary side accesses the fourth half-wave rectification device 4 and the second impedance matching device 6 to input the halfwave current of the secondary side into the half-wave transformer calibrator 9.
The standard current transformer 8 is a 0.001-level current transformer, and thus measurement accuracy may be greatly improved. During a practical application, when the standard current transformer 8 may be a 0.001-level current transformer, an error of a 0.02-level tested current transformer may be measured.
From the above descriptions, it can be seen that, according to the testing system provided by the embodiment of the disclosure, a testing circuit required by a direct current component and even harmonic resistance test is added according to a testing requirement on the basis of an original checking method for the half-wave transformer calibrator, a testing current required by the test is obtained through the added testing circuit, and the matched half-wave transformer calibrator implements measurement of the ratio error and phase error of the current transformer under the condition that a direct current and an even harmonic are introduced.
According to the solution provided by the embodiment of the disclosure, halfwave rectification is performed on secondary output of the standard current transformer for comparison with the secondary output half wave of the tested current transformer, thereby implementing accurate measurement of the ratio error and phase error of the tested current transformer under a half wave condition and avoiding a measurement error of the whole measurement system when the half-wave current passes through the standard transformer.
It should finally be noted that: the above embodiments are only adopted to describe the technical solution of the disclosure and not intended to limit the scope of protection, and although the disclosure has been described with reference to the above embodiments in detail, those ordinary skilled in the art should understand that: those skilled in the art may still make various variations, modifications or equivalent replacements to the specific implementation modes of the disclosure after reading the disclosure, and these variations, modifications or equivalent replacements fall within the scope of the claims applying for approval.
Claims (7)
1. A testing system for testing resistance of a current transformer to direct current components and even harmonics, the testing system comprising a high-current generator, a standard current transformer, half-wave rectification devices, impedance matching devices and a half-wave transformer calibrator, wherein a primary side of the testing system comprises a first half-wave rectification device, a second half-wave rectification device and a first impedance matching device, the first half-wave rectification device and the first impedance matching device connected in series being connected in parallel with the second half-wave rectification device and a tested current transformer which are connected in series;
a secondary side of the testing system comprises a third half-wave rectification device, a fourth half-wave rectification device and a second impedance matching device, the fourth half-wave rectification device, the second impedance matching device and the standard current transformer being connected in series to the third halfwave rectification device; and the high-current generator is connected with the standard current transformer.
2. The testing system according to claim 1, wherein the high-current generator converts a low current into a high current.
3. The testing system according to claim 1, wherein a 50Hz sinusoidal current wave of a period passes through a primary side of the standard current transformer, and a secondary side accesses the fourth half-wave rectification device and the second impedance matching device to input a half-wave current of the secondary side into the half-wave transformer calibrator; and the standard current transformer is a 0.001-level current transformer.
4. The testing system according to claim 1, wherein the half-wave rectification devices are configured to convert a sinusoidal wave of a period into a sinusoidal wave of a half period.
5. The testing system according to claim 1, wherein the impedance matching devices automatically matches impedances in a circuit to keep impedances in two branch circuits of the tested current transformer consistent and keep impedances in two branch circuits of the standard current transformer consistent; the two branch circuits
5 of the tested current transformer comprise: a first branch circuit and a second branch circuit, the first branch circuit comprising the first impedance matching device and the first half-wave rectification device, and the second branch circuit comprising a primary side of the tested current transformer and the second half-wave rectification device; the two branch circuits of the standard current transformer comprise: a third
10 branch circuit and a fourth branch circuit, the third branch circuit comprising a secondary side of the tested current transformer and the third half-wave rectification device, and the fourth branch circuit comprising the second impedance matching device and the fourth half-wave rectification device;
the first impedance matching device implements automatic matching of
15 primary-side impedances of the tested current transformer; and the second impedance matching device implements automatic matching of secondary-side impedances of the standard current transformer.
6. The testing system according to claim 1, wherein a positive half wave of a 50Hz
20 sinusoidal current wave of a period passes through the primary side of the tested current transformer, and a half-wave current of the secondary side is input into the half-wave transformer calibrator.
7. The testing system according to claim 1, wherein the half-wave transformer
25 calibrator compares current half waves of the standard current transformer and the tested current transformer to obtain a ratio error and a phase error by virtue of an error measurement type principle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510589596.8A CN106546938A (en) | 2015-09-16 | 2015-09-16 | A kind of anti-DC component of current transformer and test even system |
| PCT/CN2016/092115 WO2017045488A1 (en) | 2015-09-16 | 2016-07-28 | Test system for anti-dc component and even-order harmonic of current transformer |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201804682D0 GB201804682D0 (en) | 2018-05-09 |
| GB2556610A true GB2556610A (en) | 2018-05-30 |
| GB2556610B GB2556610B (en) | 2021-07-07 |
Family
ID=58288508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1804682.1A Active GB2556610B (en) | 2015-09-16 | 2016-07-28 | Test system for anti-DC component and even-order harmonic of current transformer |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN106546938A (en) |
| DE (1) | DE112016004201B4 (en) |
| GB (1) | GB2556610B (en) |
| WO (1) | WO2017045488A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108279396A (en) * | 2018-04-19 | 2018-07-13 | 南京丹迪克电力仪表有限公司 | Anti- DC component current transformer error tester and its test method |
| CN109375133B (en) * | 2018-09-17 | 2021-03-02 | 国网江西省电力有限公司电力科学研究院 | Device and method for detecting direct current resistance of current sensor |
| CN109581265B (en) * | 2018-10-30 | 2021-07-02 | 国网江西省电力有限公司电力科学研究院 | Method for detecting direct current resistance of current transformer based on power error |
| CN110133563B (en) * | 2019-05-13 | 2021-10-19 | 国网江西省电力有限公司电力科学研究院 | Method and device for detecting direct current resistance of current sensor |
| CN112068062B (en) * | 2020-09-10 | 2023-01-03 | 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 | Mutual inductor calibration system and calibration method |
| CN113009404B (en) * | 2021-01-26 | 2023-08-11 | 江阴长仪集团有限公司 | DC even harmonic error calibration method and electric energy meter |
| CN112986891B (en) * | 2021-02-10 | 2023-02-28 | 南方电网科学研究院有限责任公司 | Device and method for detecting direct current resistance of current transformer |
| CN115561695B (en) * | 2022-11-18 | 2023-06-09 | 山西互感器电测设备有限公司 | Three-phase current transformer on-site verification device and method |
| CN116184019B (en) * | 2022-12-14 | 2023-12-08 | 广州市均能科技有限公司 | Harmonic detection system, method and device for alternating current |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101533082A (en) * | 2009-04-10 | 2009-09-16 | 深圳市科陆变频器有限公司 | Electric energy meter half wave rectification testing line |
| CN102156273A (en) * | 2011-04-20 | 2011-08-17 | 郑州万特电气有限公司 | Electric energy meter verification circuit for error test and direct current and even harmonic test |
| CN102520382A (en) * | 2012-01-12 | 2012-06-27 | 江西省电力科学研究院 | Method for detecting half-wave current transformation error of current transformer |
| CN102928802A (en) * | 2012-10-16 | 2013-02-13 | 江西省电力科学研究院 | Method for detecting alternating current-direct current standard-based direct current resistance performance of current transformer |
| US8421444B2 (en) * | 2009-12-31 | 2013-04-16 | Schneider Electric USA, Inc. | Compact, two stage, zero flux electronically compensated current or voltage transducer employing dual magnetic cores having substantially dissimilar magnetic characteristics |
| CN103675749A (en) * | 2013-11-14 | 2014-03-26 | 国家电网公司 | Performance detector of electric energy meter under direct current and even harmonic conditions |
| CN104237837A (en) * | 2014-09-15 | 2014-12-24 | 河海大学 | Current transformer ratio error and angle error detection system and method |
| CN104569904A (en) * | 2014-12-19 | 2015-04-29 | 浙江万胜电力仪表有限公司 | Test device for testing direct current and even harmonic influence quantity of electric energy meter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202948126U (en) * | 2012-12-05 | 2013-05-22 | 河北省电力公司电力科学研究院 | Current transformer site error test system |
-
2015
- 2015-09-16 CN CN201510589596.8A patent/CN106546938A/en active Pending
-
2016
- 2016-07-28 DE DE112016004201.9T patent/DE112016004201B4/en active Active
- 2016-07-28 GB GB1804682.1A patent/GB2556610B/en active Active
- 2016-07-28 WO PCT/CN2016/092115 patent/WO2017045488A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101533082A (en) * | 2009-04-10 | 2009-09-16 | 深圳市科陆变频器有限公司 | Electric energy meter half wave rectification testing line |
| US8421444B2 (en) * | 2009-12-31 | 2013-04-16 | Schneider Electric USA, Inc. | Compact, two stage, zero flux electronically compensated current or voltage transducer employing dual magnetic cores having substantially dissimilar magnetic characteristics |
| CN102156273A (en) * | 2011-04-20 | 2011-08-17 | 郑州万特电气有限公司 | Electric energy meter verification circuit for error test and direct current and even harmonic test |
| CN102520382A (en) * | 2012-01-12 | 2012-06-27 | 江西省电力科学研究院 | Method for detecting half-wave current transformation error of current transformer |
| CN102928802A (en) * | 2012-10-16 | 2013-02-13 | 江西省电力科学研究院 | Method for detecting alternating current-direct current standard-based direct current resistance performance of current transformer |
| CN103675749A (en) * | 2013-11-14 | 2014-03-26 | 国家电网公司 | Performance detector of electric energy meter under direct current and even harmonic conditions |
| CN104237837A (en) * | 2014-09-15 | 2014-12-24 | 河海大学 | Current transformer ratio error and angle error detection system and method |
| CN104569904A (en) * | 2014-12-19 | 2015-04-29 | 浙江万胜电力仪表有限公司 | Test device for testing direct current and even harmonic influence quantity of electric energy meter |
Also Published As
| Publication number | Publication date |
|---|---|
| DE112016004201B4 (en) | 2021-02-11 |
| GB201804682D0 (en) | 2018-05-09 |
| CN106546938A (en) | 2017-03-29 |
| GB2556610B (en) | 2021-07-07 |
| WO2017045488A1 (en) | 2017-03-23 |
| DE112016004201T5 (en) | 2018-06-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB2556610A (en) | Test system for anti-DC component and even-order harmonic of current transformer | |
| WO2012142736A1 (en) | Field integral detecting system of three-phase electric energy measuring system of electric distribution network | |
| CN105699818A (en) | Error measurement apparatus and measurement method for current transformer | |
| Cataliotti et al. | A novel approach to current transformer characterization in the presence of harmonic distortion | |
| CN103675749A (en) | Performance detector of electric energy meter under direct current and even harmonic conditions | |
| CN107765077A (en) | A kind of excitation flow recognition method and identification device | |
| CN105182126B (en) | Improved distribution transformer energy efficiency metering detection method | |
| WO2017016370A1 (en) | Method of designing ultra-high voltage ct coil having self-calibration function | |
| CN102565618A (en) | Method for detecting zero-sequence voltage circuit of transformer substation | |
| Schöttke et al. | Transfer characteristic of a MV/LV transformer in the frequency range between 2 kHz and 150 kHz | |
| CN103439682B (en) | A kind of portable type current transformer combination misalignment proving installation is adopted to carry out the method for methods of composite errors on current transformer test | |
| CN202075405U (en) | Onsite overall detection system of three-phase electric energy metering system of distribution network | |
| CN103645415A (en) | Practical method of inspecting electric energy metering device wiring in charged mode | |
| CN202330691U (en) | Field calibrating equipment for voltage transformer | |
| CN207662990U (en) | A kind of detecting system of CT secondary circuits open circuit and virtual connection | |
| CN108919026A (en) | A kind of method of leakage current of an arrester live detection | |
| CN104698335A (en) | Method for debugging high-voltage transformer substation in systematization mode by using low tension electricity | |
| CN103176048B (en) | A kind of method of quick measuring transformer delta connection mode winding D.C. resistance | |
| CN105319478A (en) | Un-disassembly polarity and transformation ratio testing method for transformer bushing | |
| CN106814278A (en) | Plant stand take out can it is high anti-once and secondary current loop Site Detection and determination methods | |
| CN103454553A (en) | Secondary side phase checking device of voltage transformer | |
| CN110133563B (en) | Method and device for detecting direct current resistance of current sensor | |
| CN203519812U (en) | Current transformer on-site verifying unit | |
| Tong | Research on intelligent online monitoring and evaluation of power transformer | |
| Pengfei et al. | The on-site measurement research of converter transformer harmonic losses based on harmonic power source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 789A | Request for publication of translation (sect. 89(a)/1977) |
Ref document number: 2017045488 Country of ref document: WO |