CN109856586B - Current rising device and preparation method and inspection method thereof - Google Patents
Current rising device and preparation method and inspection method thereof Download PDFInfo
- Publication number
- CN109856586B CN109856586B CN201910174821.XA CN201910174821A CN109856586B CN 109856586 B CN109856586 B CN 109856586B CN 201910174821 A CN201910174821 A CN 201910174821A CN 109856586 B CN109856586 B CN 109856586B
- Authority
- CN
- China
- Prior art keywords
- current
- current transformer
- transformer
- standard
- booster
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 12
- 230000000630 rising effect Effects 0.000 title abstract description 7
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 238000007689 inspection Methods 0.000 title description 3
- 238000004804 winding Methods 0.000 claims abstract description 71
- 238000012795 verification Methods 0.000 claims abstract description 15
- 238000010998 test method Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 15
- 238000001514 detection method Methods 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention discloses a current rising device and a preparation method and a detection method thereof, wherein the detection method comprises the following steps: (2-1) respectively short-circuiting the output windings N1 and N2 … … Nn with primary windings L1, L2 and … … Ln of the standard current transformer through short-circuit wires; (2-2) connecting the current booster with a connecting terminal corresponding to the standard current transformer by adopting a preset large-current wire; and (2-3) obtaining a current ratio through a nameplate of the current transformer to be detected, selecting a primary winding with the same current ratio by the standard current transformer according to the current ratio of the current transformer to be detected, and connecting the selected primary winding of the standard current transformer and the corresponding primary winding of the current booster to the verification loop. The invention simplifies the error test wiring of the mutual inductor, improves the verification efficiency of a laboratory and reduces the risk of working errors.
Description
Technical Field
The invention relates to a current rising device, in particular to a current rising device and a preparation method and a test method thereof.
Background
The current transformer for measurement is an important compulsory verification measuring instrument, the first and periodic verification work is required according to the verification regulation of the current transformer for measurement, and a current booster is required to output test current in the error test process. The primary windings of the standard current transformer used in the test are all manufactured in a tapping mode, and the secondary windings are also in the tapping mode; the current booster is also manufactured by tapping. The current booster has two design modes, one is a stand-alone current booster, and the other is a standard current transformer with the current booster.
(1) Free standing riser: when a current transformer error test is carried out, a tap of the current booster is required to correspond to a tap of a standard transformer, and the capacity and the current of the current booster are corresponded. Otherwise, the test current may not rise to the predetermined current. Example explanation: the terminals of the conventional current boosters have 500A by 10V, 100A by 20V and 50A by 40V, while the standard current transformer has LL1 of 800A, LL2, 400A, LL3, 200A, LL4 and 100A … …. Under the condition, a test unit and workers cannot judge the matching method, so that technical confusion is caused; and the wiring process is many, and the work load is relatively great. The advantages are that: the capacity of the current booster can be designed and manufactured at will, and the current booster basically cannot move when used in a laboratory, is heavy in weight and large in size and does not influence the use of workers. As shown in fig. 1 and 2, the independent precise current transformer has small volume and light weight, and is easy to implement cycle verification work every two years.
(2) From the precision current transformer who takes current rising ware: referring to fig. 3, in the process of manufacturing the current booster, all secondary windings on the iron core of the standard current transformer are wound; finishing winding the input winding of the current booster; the sizes of the outer diameter and the inner diameter of the iron core wound by the current booster are respectively consistent with the sizes of the outer diameter and the inner diameter of the iron core wound by a standard current transformer; two iron cores are abutted together and simultaneously wound with a primary current winding; and then the integrated wire is wrapped into the shell. The advantages are that: when in use, the primary winding is wound at the same time, so that a certain amount of wound primary conductor material and a set of shell can be saved, and the comprehensive cost is lower. The disadvantages are as follows: since the precise current transformer can be used only after being qualified by the verification of a higher verification mechanism every two years, the current booster and the standard current transformer are assembled into a whole, and the single standard current transformer with the current booster is difficult to transport (for example, the weight of a 2000A precise current transformer is 30kg, the weight of a 2000A precise current transformer with the current booster is 120kg, and the volume is increased by at least 5 times), so that the capacity of the current booster is limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the current booster, the preparation method and the inspection method thereof, so that the error test wiring of the transformer is simplified, the verification efficiency of a laboratory is improved, and the work error risk is reduced.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the current booster comprises an iron core, a primary input winding Nin wound on the iron core and a low-voltage large-current output winding, wherein the low-voltage large-current output winding is composed of a plurality of output windings N1 and N2 … … Nn which are isolated from each other.
The primary input winding Nin and the low-voltage large-current output winding adopt a multi-strand flat winding mode.
Setting the number of turns of the low-voltage large-current output windings N1, N2 and … … Nn, wherein the output current range is 1% -120%, 150% or 200% of the rated current; the input voltage of the current booster is 20-90% of the rated input voltage when the current booster is boosted to the rated current for one time of current expansion.
The preparation method of the current rising device comprises the following steps:
(1-1) winding a primary input winding Nin on an iron core;
and (1-2) respectively winding a plurality of low-voltage large-current output windings N1 and N2 … … Nn which are isolated from each other on the iron core.
The invention discloses a method for inspecting a current booster, which comprises the following steps:
(2-1) respectively short-circuiting the output windings N1 and N2 … … Nn with the primary windings L1, L2 and … … Ln of the standard current transformer CTo through short-circuit wires;
(2-2) connecting the current booster with a connecting terminal corresponding to the standard current transformer CTo by adopting a preset large-current lead;
and (2-3) obtaining a current ratio through a nameplate of the current transformer CTx to be detected, selecting a primary winding with the same current ratio by the standard current transformer CTo according to the current ratio of the current transformer CTx to be detected, and connecting the selected primary winding of the standard current transformer CTo and the corresponding primary winding of the current booster to the verification loop.
In the step (2-1), the rated currents of the low-voltage large-current windings N1, N2 and … … Nn correspond to the rated currents of the primary windings L1, L2 and … … Ln of the standard current transformer CTo.
In the step (2-2), the diameter D of the through hole on the chassis of the current riser and the height H of the center of the through hole from the ground are the same as the diameter of the through hole of the standard current transformer CTo and the height from the ground, and the capacity is matched with the current.
In the step (2-3), the primary winding polarity end L of the standard current transformer CTo is butted with the primary winding polarity end P1 of the current transformer CTx to be detected, and the non-polarity end P2 of the current transformer CTx to be detected is butted with the winding selected by the current booster.
The secondary winding polarity end of the standard current transformer CTo is butted with the polarity end of the current transformer CTx to be detected, and is connected to a difference current loop k of a transformer calibrator HE; and selecting one non-polar end of the standard current transformer CTo as the To end of a standard current input transformer calibrator HE, and connecting the non-polar end of the current transformer CTx To be tested To the Tx end of the transformer calibrator HE after being connected with the load box Z.
Compared with the closest prior art, the technical scheme provided by the invention has the following benefits:
(1) compared with a conventional independent current booster, the secondary output of the current booster is an independent winding, the current booster is matched with a conventional independent standard current transformer, a low-voltage large-current winding of the current booster is connected with a secondary winding of the standard current transformer in series respectively, a specific low-voltage large-current winding is selected according to actual verification requirements to form a verification loop, the structure of the current booster is consistent with that of a precise current transformer, and the complex wiring problem of a primary large-current loop in transformer verification can be simplified.
(2) Compared with a precision current transformer with a current booster, the capacity of the current booster is large, and the problem that the current booster is difficult to periodically test due to heavy weight and large volume does not exist.
(3) The self-current-lifting precise current transformer has the characteristics of large capacity of the self-contained current lifting device, so that the self-current-lifting precise current transformer is easy to send and inspect, and the self-current-lifting precise current transformer is convenient to use and wire.
Drawings
FIG. 1 is a diagram of a conventional free standing riser panel layout;
FIG. 2 is a schematic diagram of a conventional free standing riser;
FIG. 3 is a schematic diagram of a precision current transformer with a current booster;
FIG. 4 is a schematic view of a flow riser of the present invention;
FIG. 5 is a schematic diagram of a current riser of the present invention in a transformer error test operating principle;
fig. 6(a) is a schematic structural diagram of a current booster and an independent precision current transformer according to the present invention;
fig. 6(b) is a plan view of fig. 6 (a).
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As illustrated in fig. 4: a circuit diagram of a current booster with simplified error testing function. Nin is a primary input winding, and N1, N2, N3 and N4-Nn are a plurality of low-voltage large-current output windings which are mutually isolated and respectively wound.
As shown in fig. 5: CTo is a standard current transformer, the accuracy level of which is higher than that of the tested current transformer (CTx) by more than two accuracy levels, and is used for detecting the error of the tested current transformer. Wherein, the polarity end of the primary winding is L, and the polarity end of the secondary winding is k.
CTx is the current transformer to be detected, the primary winding polarity end is P1, and the secondary polarity end is S1.
CTo primary winding polarity terminal L interfaces with the primary winding polarity terminal P1 of CTx.
CTo the secondary winding polarity end k is connected with the secondary polarity end S1 of CTx and then connected to the k terminal of the transformer check meter.
SL is a current booster of the present invention for providing a test primary current in the verification line of fig. 5.
And Z is a current transformer load box used for simulating the load of a secondary loop belt of the current transformer to be detected.
And the HE is a transformer calibrator used for comparing the error current in the line with the standard current transformer and measuring the standard current to finally obtain the ratio error and the angle error of the current transformer to be tested. Where the k terminal measures the differential current and the To terminal measures the standard secondary current.
When a test current passes through the standard current transformer CTo (with the same current ratio as the current transformer to be tested) and the primary winding of the current transformer to be tested CTx, the secondary winding kKn (specifically selected and determined according to the current ratio of the current transformer to be tested and the name plate of the standard current transformer) and the secondary winding S1S2 of the current transformer to be tested can both output secondary currents, and according to the law of kirchhoff current, since both the two output current secondary currents pass through a node S1 (the secondary polarity end of the current transformer to be tested), all incoming and outgoing currents of the node are added to zero, the node generates a difference current after the subtraction of the secondary output current of the standard current transformer (CTo) and the secondary output current of the current transformer to be tested (CTx), and the difference current is the absolute error of the current transformer to be tested, the differential current enters the k terminal of the transformer calibrator.
KG is the primary winding change over switch of standard current transformer, also can be operated by the manual work and switch over.
An error measuring circuit is used for carrying out short circuit on N1, N2, N3 and N4-Nn respectively at L1, L2, L3 and L4-Ln of an external precision current transformer CTo through short connection wires when error detection of the current transformer is needed, a current booster and a through hole of the precision current transformer penetrate through a test lead at the same time, and the number of penetrating turns or one winding of N1, N2, N3 and N4-Nn is selected to participate in error detection of the current transformer according to the transformation ratio of a tested product.
The polar end of the primary winding of the precision current transformer CTo is butted with the polar end of the current transformer CTx to be detected, and the non-polar end of the CTx is butted with the winding selected by the current booster, so that the wiring of a primary loop is completed; CTo connecting the secondary winding polarity end with the polarity end of CTx and connecting to the difference current loop k of the HE transformer calibrator; one of the non-polar ends of CTo is selected as the To end of the standard current input HE, and the non-polar end of the current transformer CTx To be detected is connected To the Tx end of the HE after being connected with the load box Z. And the HE is a measuring differential type mutual inductor calibrator.
Compared with the conventional independent current booster and the precision current transformer, the error checking method has the advantages that the output large-current windings of the current booster correspond to the primary windings of the precision current transformer one by one and can be connected well at one time through short wires, the current booster is not detached in the using process, the output of the current booster and the connection of the primary windings of the precision current transformer are manually matched in a simplified mode, and the capacity is matched, so that the output working current under satisfactory output voltage can be obtained, for example, the power output of 50-200V can directly reach the rated test current.
Compared with the conventional precision current transformer with the current booster, the independent current booster is consistent with the precision current transformer in appearance structure, output winding terminal arrangement, height of the through hole and aperture, so that the independent current booster and the precision current transformer can be placed side by side, the structure is compact, and the use is convenient.
In fig. 6(a), the position, height H, and aperture D of the feedthrough of the current riser are the same as those of the standard current transformer. In fig. 6(b), the position, height, and rated current of the primary winding of the current booster correspond to those of the standard current transformer.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A method of testing an elevator, comprising the steps of:
(2-1) respectively short-circuiting low-voltage large-current windings N1 and N2 … … Nn of the current booster with primary windings L1, L2 and … … Ln of a standard current transformer CTo through short-circuit wires;
(2-2) connecting the current booster with a connecting terminal corresponding to the standard current transformer CTo by adopting a preset large-current lead;
(2-3) obtaining a current ratio through a nameplate of the current transformer CTx to be detected, selecting a primary winding with the same current ratio by the standard current transformer CTo according to the current ratio of the current transformer CTx to be detected, and connecting the selected primary winding of the standard current transformer CTo and the corresponding primary winding of the current booster into a verification loop;
in the step (2-3), a primary winding polarity end L of the standard current transformer CTo is butted with a primary winding polarity end P1 of the current transformer CTx to be detected, and a non-polarity end P2 of the current transformer CTx to be detected is butted with a winding selected by the current booster;
the secondary winding polarity end of the standard current transformer CTo is butted with the polarity end of the current transformer CTx to be detected, and is connected to a difference current loop k of a transformer calibrator HE; and selecting one non-polar end of the standard current transformer CTo as the To end of a standard current input transformer calibrator HE, and connecting the non-polar end of the current transformer CTx To be tested To the Tx end of the transformer calibrator HE after being connected with the load box Z.
2. The method for inspecting a current booster of claim 1, wherein in the step (2-1), the rated currents of the low-voltage high-current windings N1, N2 and … … Nn correspond to the rated currents of the primary windings L1, L2 and … … Ln of a standard current transformer CTo.
3. The method for inspecting an elevator as claimed in claim 1, wherein in step (2-2), the diameter D of the through hole on the chassis of the elevator, the height H of the center of the through hole from the ground level are the same as those of the standard current transformer CTo, and the capacity is matched with the current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910174821.XA CN109856586B (en) | 2019-03-08 | 2019-03-08 | Current rising device and preparation method and inspection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910174821.XA CN109856586B (en) | 2019-03-08 | 2019-03-08 | Current rising device and preparation method and inspection method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109856586A CN109856586A (en) | 2019-06-07 |
| CN109856586B true CN109856586B (en) | 2021-07-02 |
Family
ID=66900143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910174821.XA Active CN109856586B (en) | 2019-03-08 | 2019-03-08 | Current rising device and preparation method and inspection method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109856586B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110277239A (en) * | 2019-07-04 | 2019-09-24 | 南京丹迪克电力仪表有限公司 | A method of preparing the twin-stage standard current transformer that any variation may be implemented |
| CN111157941A (en) * | 2020-01-19 | 2020-05-15 | 广东电网有限责任公司计量中心 | Device and method for quickly switching and checking primary winding of power transformer |
| CN113823495B (en) * | 2021-11-23 | 2022-02-08 | 武汉磐电科技股份有限公司 | High-voltage double-wire pack assembly and high-voltage self-current-rising standard current transformer |
| CN114823088B (en) * | 2022-06-23 | 2022-09-23 | 国网湖北省电力有限公司营销服务中心(计量中心) | Standard transformer and using method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2365746Y (en) * | 1999-03-03 | 2000-02-23 | 薛军 | Induction voltage regulating integral apparatus for test |
| CN2729742Y (en) * | 2002-10-28 | 2005-09-28 | 广东省四会市互感器厂 | Current sensor error detecting table |
| CN101424728A (en) * | 2008-11-10 | 2009-05-06 | 西北电网有限公司 | On site precision detecting test line for high-voltage current transformer |
| CN104330760A (en) * | 2014-11-10 | 2015-02-04 | 国家电网公司 | Precise high-voltage current mutual inductor and error testing system and method thereof |
| CN105044432A (en) * | 2015-07-06 | 2015-11-11 | 国家电网公司 | Method for measuring leaking current of current transformer |
| CN107677980A (en) * | 2017-09-30 | 2018-02-09 | 国网四川省电力公司电力科学研究院 | A kind of power distribution network transformer metering performance integration detection platform and method |
| CN207318698U (en) * | 2017-09-29 | 2018-05-04 | 贵州送变电工程公司 | A kind of Multifunctional three-phase current lifting device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7567881B2 (en) * | 2007-03-30 | 2009-07-28 | General Electric Company | Self-adjusting voltage filtering technique compensating for dynamic errors of capacitive voltage transformers |
-
2019
- 2019-03-08 CN CN201910174821.XA patent/CN109856586B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2365746Y (en) * | 1999-03-03 | 2000-02-23 | 薛军 | Induction voltage regulating integral apparatus for test |
| CN2729742Y (en) * | 2002-10-28 | 2005-09-28 | 广东省四会市互感器厂 | Current sensor error detecting table |
| CN101424728A (en) * | 2008-11-10 | 2009-05-06 | 西北电网有限公司 | On site precision detecting test line for high-voltage current transformer |
| CN104330760A (en) * | 2014-11-10 | 2015-02-04 | 国家电网公司 | Precise high-voltage current mutual inductor and error testing system and method thereof |
| CN105044432A (en) * | 2015-07-06 | 2015-11-11 | 国家电网公司 | Method for measuring leaking current of current transformer |
| CN207318698U (en) * | 2017-09-29 | 2018-05-04 | 贵州送变电工程公司 | A kind of Multifunctional three-phase current lifting device |
| CN107677980A (en) * | 2017-09-30 | 2018-02-09 | 国网四川省电力公司电力科学研究院 | A kind of power distribution network transformer metering performance integration detection platform and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109856586A (en) | 2019-06-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109856586B (en) | Current rising device and preparation method and inspection method thereof | |
| CN105974348B (en) | Low-voltage current mutual inductor comprehensive detection system and its method | |
| CN102096060B (en) | Circuit for checking on-site accuracy of current transformer under condition of underload operations | |
| CA2558308A1 (en) | Method and apparatus for characterising a three phase transformer using a single phase power supply | |
| CN110850334B (en) | Nondestructive testing method and device for CT secondary circuit state | |
| CN109212457B (en) | Automatic crimping device and verification method for multi-position high-voltage transformer | |
| WO2021000670A1 (en) | Method for preparing two-stage standard current transformer capable of implementing any change | |
| US4241306A (en) | Test fixture having switching means for facilitating transformer turns ratio testing | |
| CN105842541A (en) | Rapid testing apparatus and testing method for large scale transformer's direct current resistance | |
| CN110927653A (en) | Whole body calibration system and calibration method for field calibration instrument of current transformer | |
| KR101963359B1 (en) | Switch device for measuring device for transformer, test device, and method of operating switch device | |
| US3368146A (en) | Electrical safety tester having a plurality of switches for setting up tests | |
| EP1532461B1 (en) | Circuit for simultaneous testing of electricity meters with interconnected current and voltage circuits | |
| CA2639989C (en) | High current precision resistance measurement system | |
| RU2119676C1 (en) | Device for verification of measuring current transformers | |
| CN101387657B (en) | Standard current transformer integration apparatus for on-site detection | |
| CN105890808A (en) | Temperature calibrator for main transformer | |
| CN2280919Y (en) | Integrated mutual-inductor calibration device | |
| CN210465668U (en) | Vehicle-mounted GIS type meter source device | |
| US1550906A (en) | Instrument transformer | |
| KR101654644B1 (en) | Test device for wiring electric generator | |
| CN210720563U (en) | Current sampling device | |
| CN201886089U (en) | Fully automatic tester for variable ratio bridges | |
| CN216526259U (en) | Full-automatic calibrating device of standard current transformer | |
| US1587841A (en) | Testing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |