CN204613387U - For the electric supply installation that current transformer detects - Google Patents
For the electric supply installation that current transformer detects Download PDFInfo
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- CN204613387U CN204613387U CN201520193145.8U CN201520193145U CN204613387U CN 204613387 U CN204613387 U CN 204613387U CN 201520193145 U CN201520193145 U CN 201520193145U CN 204613387 U CN204613387 U CN 204613387U
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- 238000009434 installation Methods 0.000 title claims abstract description 13
- 238000012423 maintenance Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000012360 testing method Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 206010010219 Compulsions Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002996 emotional effect Effects 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model discloses a kind of electric supply installation detected for current transformer, belong to current transformer field tests, its structure is: maintenance power box (1) lead-out terminal a, b, c, n respectively with converters (2) input terminal e, f, g, m is connected successively, maintenance power box (1) lead-out terminal c, n is connected respectively to two ends, pressure regulator (3) former limit, pressure regulator (3) secondary one end is connected to converters (2) lead-out terminal N, the other end and converters (2) lead-out terminal L are connected respectively to two ends, current lifting device (4) former limit.The utility model overload capacity is strong, fast response time, and input current is little, under ensureing the prerequisite of current transformer testing result accuracy, reduces equipment volume, weight that current transformer detects.
Description
Technical field
The utility model relates to current transformer detection field, is specifically related to a kind of electric supply installation detected for current transformer.
Background technology
Along with the fast development of electric system, to put into operation in electrical network and the metering mutual inductor quantity that uses constantly increases.Mutual inductor error in dipping relates to electric energy metrical and trade settlement, belongs to state compulsion calibrating project, therefore, proposes severeer requirement to the work efficiency of mutual inductor on site measurement verification.Traditional mutual inductor field detecting method is all the relative method adopting JJG-1021 " electric power mutual-inductor vertification regulation " to require, as shown in Figure 1.Need to carry a large amount of checkout equipments in error-detecting, comprise standard current transformer, pressure regulator, current lifting device, current capacity case etc.When primary circuit electric current is greater than 2000A, primary circuit emotional resistance can reach 70%-90%, and required power supply capacity is multiplied, and this not only makes equipment volume huge, heavyly not easily carries, and the wiring of big current primary circuit is difficult, brings very big inconvenience to work on the spot.
For overcoming these problems, general employing indirect method and direct method in substation field test both at home and abroad.Indirect method is divided into two kinds, and one is load simulation method, based on the T-shaped equivalent circuit of current transformer, with expanding the impact of the equivalent primary current increase of secondary load on current transformer error; Two is utilize CT(Current transformer, current transformer) on-spot tester or CT analyser etc., according to current transformer equivalent electrical circuit, measure in conjunction with parameters such as Secondary Winding direct current resistance, magnetization curve and admittance with voltage method, then analytical calculation draws error in dipping.These means solve the problem excessive to power supply, pressure regulator and current lifting device capacity requirement, make that the equipment volume entrained by site test reduces, weight saving, but its test condition is completely different from the current transformer operating mode in actual motion, greatly reduces the reliability of check results.Direct method is divided into three kinds, and one is the aerial cross sectional that reduction big current wire surrounds, and the method reaches by reducing sectional area the object reducing loop induction reactance, but big current wire is too heavy, not easily implements; Two is that the parallel connection of current lifting device input end supplements capacitance method, and the method can compensate the induction reactance of primary circuit, thus reduces pressure regulator and the capacity needed for power supply, but still cannot reduce the capacity of current lifting device; Three is adopt high power three-phase commutation inversion power supply, simultaneously the method principal feature accesses three-phase maintenance power supply, commutation inversion becomes single phase poaer supply to export again, thus reduce required maintenance power supply capacity, but (less than 5% rated current) shortcoming that harmonic content is high, irregularity of wave form is large when the method exists underloading, has had a strong impact on the validity of error testing result.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of electric supply installation detected for current transformer, overload capacity is strong, fast response time, and input current is little, under ensureing the prerequisite of current transformer testing result accuracy, reduce equipment volume, weight that current transformer detects.
For solving the problems of the technologies described above, technical scheme provided by the utility model is:
A kind of electric supply installation detected for current transformer, its structure is: maintenance power box lead-out terminal a, b, c, n are connected successively with converters input terminal e, f, g, m respectively, maintenance power box lead-out terminal c, n are connected respectively to two ends, pressure regulator former limit, pressure regulator secondary one end is connected to converters lead-out terminal N, and the other end and described converters lead-out terminal L are connected respectively to two ends, current lifting device former limit.
As one optimization, be also provided with building-out capacitor C1, described building-out capacitor C1 is connected in parallel on the former limit of described current lifting device.
The beneficial effects of the utility model are:
1, Large Copacity current lifting device and compensation condenser group is integrated with, GIS(Gas Insulated Switchgear can be met, gas-insulated switchgear) structure, especially grow great current mutual inductor calibrating requirement in distance GIS structure, maximum primary current can reach 6000A.
2, require low to site test power supply capacity.Adopt based on PWM(Pulse Width Modulation, pulse-length modulation) the three phase rectifier inverter of technology is as master trip power supply, instead of traditional single-phase experiment power supply, greatly reduce the capacity of experiment power supply like this, there is the feature of the high and strong interference immunity of fast response time, reliance security.
3, utilize traditional pressure regulator to carry out the test of 1%, 5% error point, compensate for converters harmonic wave of output voltage content under underloading high, the defect that irregularity of wave form is high.
4, time saving and energy saving during on-the-spot test test, efficiency is high.Staff, without the need to carrying extra calibration equipment, eliminates loaded down with trivial details wiring work consuming time, after only need connecing power supply, primary circuit and secondary loop current line in succession, can carry out calibration operation.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail, wherein:
Fig. 1 is conventional current transformer error measuring principle figure.
Fig. 2 is electric supply installation main circuit topological structure schematic diagram in the utility model.
In figure: 1-maintenance power box; 2-converters; 3-pressure regulator; 4-current lifting device; Building-out capacitor C1; Primary circuit equivalent resistance R1; Primary circuit equivalent inductive reactance X
l1; Maintenance power box lead-out terminal is followed successively by a, b, c, n, and converters input terminal is followed successively by e, f, g, m, and converters lead-out terminal is followed successively by L, N.
Embodiment
The utility model have developed a kind of electric supply installation for current transformer performance test, it have employed mode that three phase rectifier inverter and traditional pressure regulator based on PWM technology combine provide detecting current transformer test needed for electric current.This electric supply installation main circuit topological structure schematic diagram as shown in Figure 2.
The structure of the electric supply installation in the utility model is: maintenance power box 1 lead-out terminal a, b, c, n are connected successively with converters 2 input terminal e, f, g, m respectively, described maintenance power box 1 lead-out terminal c, n are connected respectively to two ends, pressure regulator 3 former limit, described pressure regulator 3 secondary one end is connected to converters 2 lead-out terminal N, and the other end and described converters 2 lead-out terminal L are connected respectively to two ends, current lifting device 4 former limit.Compared with traditional voltage controller power source, converters 2 adopts semiconductor devices, and its own switch loss is little, and temperature rise is low, has the advantages such as responding range is large, input current is little.This electric supply installation, in order to make up the three phase rectifier inverter defect that harmonic wave of output voltage content is high under underloading, irregularity of wave form is large, carries out series compensation with pressure regulator 3 pairs of converters 2.
In order to continue to improve up-flow ability, as one optimization, be also provided with building-out capacitor C1, described building-out capacitor C1 is connected in parallel on the described former limit of current lifting device 4.In the former limit parallel connection of current lifting device 4, building-out capacitor C1 carries out reactive-load compensation, when the size adjustment of electric capacity reaches resonance, the idle and capacitive reactive power of perception can be made mutually to balance, thus greatly reduce the capacity requirement to power supply, pressure regulator 3.
During the utility model device busy, when electric current is less, 5% rated current and following time, direct adjustment pressure regulator 3 delivers to current lifting device 4 after boosting, time more than 5% rated current, provide experiment power supply by converters 2, regulate the control handle of converters 2.The utility model device combines that pressure regulator 3 steady-state behaviour is good, precision is high and converters 2 fast response time, advantage that input current is little, significant concerning improving the accuracy of large current transducer check work, safety and reliability.
Claims (2)
1. the electric supply installation detected for current transformer, it is characterized in that: maintenance power box (1) lead-out terminal a, b, c, n are connected successively with converters (2) input terminal e, f, g, m respectively, described maintenance power box (1) lead-out terminal c, n are connected respectively to two ends, pressure regulator (3) former limit, described pressure regulator (3) secondary one end is connected to converters (2) lead-out terminal N, and the other end and described converters (2) lead-out terminal L are connected respectively to two ends, current lifting device (4) former limit.
2., as claimed in claim 1 for the electric supply installation that current transformer detects, it is characterized in that: be also provided with building-out capacitor C1, described building-out capacitor C1 is connected in parallel on described current lifting device (4) former limit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520193145.8U CN204613387U (en) | 2015-04-01 | 2015-04-01 | For the electric supply installation that current transformer detects |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520193145.8U CN204613387U (en) | 2015-04-01 | 2015-04-01 | For the electric supply installation that current transformer detects |
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| Publication Number | Publication Date |
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| CN204613387U true CN204613387U (en) | 2015-09-02 |
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| CN201520193145.8U Active CN204613387U (en) | 2015-04-01 | 2015-04-01 | For the electric supply installation that current transformer detects |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425193A (en) * | 2016-01-12 | 2016-03-23 | 江苏省电力公司电力科学研究院 | Extra-high-voltage current transformer verification system |
| CN109991515A (en) * | 2019-04-09 | 2019-07-09 | 国网四川省电力公司电力科学研究院 | The method and system of a high current are obtained under a kind of low actual load |
-
2015
- 2015-04-01 CN CN201520193145.8U patent/CN204613387U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425193A (en) * | 2016-01-12 | 2016-03-23 | 江苏省电力公司电力科学研究院 | Extra-high-voltage current transformer verification system |
| CN109991515A (en) * | 2019-04-09 | 2019-07-09 | 国网四川省电力公司电力科学研究院 | The method and system of a high current are obtained under a kind of low actual load |
| CN109991515B (en) * | 2019-04-09 | 2021-11-30 | 国网四川省电力公司电力科学研究院 | Method and system for acquiring primary large current under low actual load |
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