CN205157757U - Standard current transformer secondary load improves device - Google Patents
Standard current transformer secondary load improves device Download PDFInfo
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- CN205157757U CN205157757U CN201520935870.8U CN201520935870U CN205157757U CN 205157757 U CN205157757 U CN 205157757U CN 201520935870 U CN201520935870 U CN 201520935870U CN 205157757 U CN205157757 U CN 205157757U
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- 238000005259 measurement Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Abstract
The utility model relates to a standard volume passes current transformer technical field among the electric power system, especially relates to a standard current transformer secondary load improves device. The utility model discloses a relatively fixed load of establishing ties in being examined current transformer secondary circuit improves the device, carries out the measurement of rated value and lower limit value through the regulation to the device switch. The utility model discloses simplified standard current transformer error examination process, need not to carry heavy current transformer load case, improved examination efficiency, reduced experimental trouble and take place, the security and the reliability of the operation of effectual improvement electric power.
Description
Technical field
The utility model relates to electric system Plays amount and to conduct electricity current transformer technical field, particularly relates to a kind of standard current transformer secondary load modifying device.
Background technology
According to JJG313-2010 " Verification of Measuring Current Transformer vertification regulation " requirement, when carrying out error testing to current transformer, need to examine respectively secondary load ratings and lower limit.Tradition calibrating mode is a current transformer load box of connecting in tested secondary loop of mutual inductor, Burden box is allocated to corresponding numerical value and carries out ratings and lower limit measurement.For the standard current transformer that secondary current in power system is 5A, wherein secondary rated load is generally 5VA, and underloading load is 2.5VA, and load power factor is 1.0, in reality calibrating, only need at 2 can complete measurement, without the need to complete current transformer load box.
Utility model content
For overcoming the defect existed in prior art, the utility model provides a kind of standard current transformer secondary load modifying device, its objective is and a kind of current transformer load box that can replace tradition calibrating is provided, simplify standard current transformer error testing process, and calibrating efficiency can be improved, reduce a kind of standard current transformer secondary load modifying device that testing failure occurs.
The utility model solves the technical scheme that its technical matters adopts:
A kind of standard current transformer secondary load modifying device, a relative dead load modifying device of connecting in tested secondary loop of mutual inductor, by carrying out the measurement of ratings and lower limit to the adjustment of device switch.
The secondary terminals of described tested current transformer is connected with mutual-inductor tester respectively with standard current transformer.
Also switch is connected with in described tested secondary loop of mutual inductor.
The beneficial effects of the utility model are:
The utility model simplifies standard current transformer error testing process, without the need to carrying heavy current transformer load box, improving calibrating efficiency, reducing testing failure and occurring, the effective safety and reliability improving electric operating.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is the system wiring location drawing of the present utility model;
Fig. 2 is simplified structure diagram of the present utility model.
In figure: load modifying device Z.
Embodiment
The utility model is a kind of standard current transformer secondary load modifying device, and a relative dead load modifying device of specifically connecting in tested secondary loop of mutual inductor, by carrying out the measurement of ratings and lower limit to the adjustment of device switch.This load modifying device Z is different from existing current transformer load box without the need to dismounting, by the adjustment to switch, can carry out the error testing of ratings and lower limit respectively.
During concrete enforcement, as shown in Figure 1, first the series connection of mutual inductor secondary load modifying device is inserted in the tested mutual inductor jack of mutual-inductor tester, this load modifying device Z can regard as a whole with tester as, is then connected with mutual-inductor tester by shown in Fig. 1 with the secondary terminals of tested current transformer by standard current transformer.
As shown in Figure 2, Fig. 2 is the simplification structural representation of the utility model modifying device.Mainly be divided into ohmic load and switch two parts.Because standard current transformer rated load mostly is 5VA, underloading load mostly is 2.5VA, standard current transformer bearing power factor COS Ф=1.0, is the current transformer of 5A for secondary current, load capacity formula S=I
2× Z, therefore during nominal case, resulting impedance is 0.2 Ω, and during underloading, resulting impedance is 0.1 Ω, underloading and specified time be purely resistive load.When measuring rated load, disconnected by switch, the external resulting impedance of load modifying device Z is 0. circuits resulting impedance is 0.1 Ω.The conversion of rated load and underloading load is so completed by the break-make of switch.2 Ω; When measuring underloading load, closed by switch, be equivalent to two 0.2 Ω resistor coupled in parallel, load modifying device circuit resulting impedance is 0.1 Ω.The conversion of rated load and underloading load is so completed by the break-make of switch.
Claims (3)
1. a standard current transformer secondary load modifying device, is characterized in that: a relative dead load modifying device of connecting in tested secondary loop of mutual inductor, by carrying out the measurement of ratings and lower limit to the adjustment of device switch.
2. a kind of standard current transformer secondary load modifying device according to claim 1, is characterized in that: the secondary terminals of described tested current transformer is connected with mutual-inductor tester respectively with standard current transformer.
3. a kind of standard current transformer secondary load modifying device according to claim 1, is characterized in that: be also connected with switch in described tested secondary loop of mutual inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520935870.8U CN205157757U (en) | 2015-11-23 | 2015-11-23 | Standard current transformer secondary load improves device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520935870.8U CN205157757U (en) | 2015-11-23 | 2015-11-23 | Standard current transformer secondary load improves device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205157757U true CN205157757U (en) | 2016-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520935870.8U Active CN205157757U (en) | 2015-11-23 | 2015-11-23 | Standard current transformer secondary load improves device |
Country Status (1)
| Country | Link |
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| CN (1) | CN205157757U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842646A (en) * | 2016-06-17 | 2016-08-10 | 国家电网公司 | Device for verifying non-gateway metering generator outlet voltage transformer |
| CN106443169A (en) * | 2016-09-29 | 2017-02-22 | 国网四川省电力公司电力科学研究院 | Circuit and method for improving overall metering performance of energy metering device of power distribution network |
| CN107037388A (en) * | 2016-12-30 | 2017-08-11 | 国网辽宁省电力有限公司电力科学研究院 | A kind of Secondary Load of Voltage Transformer improves device |
-
2015
- 2015-11-23 CN CN201520935870.8U patent/CN205157757U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842646A (en) * | 2016-06-17 | 2016-08-10 | 国家电网公司 | Device for verifying non-gateway metering generator outlet voltage transformer |
| CN106443169A (en) * | 2016-09-29 | 2017-02-22 | 国网四川省电力公司电力科学研究院 | Circuit and method for improving overall metering performance of energy metering device of power distribution network |
| CN107037388A (en) * | 2016-12-30 | 2017-08-11 | 国网辽宁省电力有限公司电力科学研究院 | A kind of Secondary Load of Voltage Transformer improves device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |