CN204359884U - A kind of Power Transformer in Field load testing apparatus - Google Patents
A kind of Power Transformer in Field load testing apparatus Download PDFInfo
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- CN204359884U CN204359884U CN201520068077.2U CN201520068077U CN204359884U CN 204359884 U CN204359884 U CN 204359884U CN 201520068077 U CN201520068077 U CN 201520068077U CN 204359884 U CN204359884 U CN 204359884U
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Abstract
A kind of Power Transformer in Field load testing apparatus, for testing tested transformer, comprise power supply, high-tension switch cabinet, induction voltage regulator, intermediate transformer, compensation condenser group, mutual inductor precision measurement unit and experiment control system set of equipments, one side joint power supply of high-tension switch cabinet, the opposite side of high-tension switch cabinet connects induction voltage regulator, induction voltage regulator, intermediate transformer, compensation condenser group, mutual inductor precision measurement unit passes through connection successively, compensation condenser group is had to drop into the calculating of combinations of voltages and combined capacity, controlling functions, significantly reduce the requirement to site test power supply capacity.
Description
Technical field
The present invention relates to high voltage electric equipment experimental technique field, particularly relate to the rig-site utilization device of power transformer load test.
Background technology
In recent years, along with the fast development of electric system, user requires more and more higher to the economy of high voltage electric equipment especially power transformer and reliability service.The load loss of transformer is a key technical index, and it is for the economical operation of transformer and have extremely important meaning the serviceable life of transformer itself; And short-circuit impedance determines transformer when Operation of Electric Systems on electrodynamic size when the impact of voltage ripple of power network and transformer generation Outlet Short Circuit Fault, simultaneously short-circuit impedance still determines that can transformer a necessary condition of parallel running.The load loss of transformer and this two indices of short-circuit impedance can be measured by transformer load test and obtain, user carries out load test at the scene can check this two indices whether in the scope that national standard and user require, and the hidden danger in transformer circuit can be checked, therefore field load test is the important technical of qualification transformer performance and quality.
The load test of transformer is usually by transformer side winding (being generally low-pressure side) short circuit, and the alternating voltage of rated frequency is added from opposite side winding, make the electric current in Transformer Winding reach ratings, measure added impedance voltage (i.e. short-circuit impedance) and short circuit loss.Three-winding transformer load test should be measured different winding centerings three, non-tested winding open circuit.
At the scene in test, because tested transformer short-circuit capacity is comparatively large, the capacity of required experiment power supply is often difficult to meet the demands, and causes test unit supporting with it as requirement when induction voltage regulator, intermediate transformer etc. should not meet site test.Due to high by site test voltage, that test current large, measuring accuracy requires high-technology factor restriction, rarely had at operation scene the examination realizing high-power transformer load test in the past, lacked the load testing apparatus effectively checking Winding in Power Transformer quality from load loss angle.
Summary of the invention
The object of the present invention is to provide a kind of Power Transformer in Field load testing apparatus, can the load loss of Measurement accuracy transformer and short-circuit impedance, assessment transformer energy loss operationally and safety operation level, thus effectively check winding material and the processing quality of transformer, improve power transformer safety operation level.
Technical scheme of the present invention is:
A kind of Power Transformer in Field load testing apparatus, for testing tested transformer, comprise power supply, high-tension switch cabinet, induction voltage regulator, intermediate transformer, compensation condenser group, mutual inductor precision measurement unit and experiment control system set of equipments, one side joint power supply of high-tension switch cabinet, the opposite side of high-tension switch cabinet connects induction voltage regulator, induction voltage regulator, intermediate transformer, compensation condenser group, mutual inductor precision measurement unit passes through connection successively, mutual inductor precision measurement unit is arranged in precision measurement mutual inductor cabinet, mutual inductor precision measurement unit comprises voltage transformer (VT) summation current transformer, compensation condenser group is made up of 2 group capacitor groups, and compensation condenser group equiva lent impedance is ZC, and tested Transformer Short Circuit Impedance is ZT, then ZC ≈ ZT.
Compensation condenser gross rated capacity is 10500kVar, and rated voltage is respectively 11.0/19.0kV.
Power supply is three-phase 380V, capacity 500kW.
The rated capacity of induction voltage regulator is 500kVA, is specifiedly input as 0.38kV/880A, and specified output is 0 ~ 0.65kV/444A.
Intermediate transformer rated capacity is 500kVA, and regulative mode is that electronic off circuit tap changer regulates.
The scale of precision of the voltage transformer (VT) of mutual inductor precision measurement unit is 0.01 grade, rated voltage and rated capacity are respectively 40.0kV, 0.5VA, the scale of precision of the current transformer of mutual inductor precision measurement unit is 0.01 grade, and rated voltage and rated capacity are respectively 40.0kV, 5VA.
Advantage of the present invention:
The first, load loss test can be carried out to 35 ~ 220kV electric pressure Transformer on Site;
The second, can the load loss of Measurement accuracy transformer and short-circuit impedance index, and there is load loss measure the automatic computing function of test findings;
3rd, there is calculating, controlling functions that compensation condenser group drops into combinations of voltages and combined capacity, significantly reduce the requirement to site test power supply capacity;
4th, it is convenient that device installs transformation, and test method is flexible; Cost is low, and cost performance is high.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention;
In figure, 1 is high-tension switch cabinet, and 2 is induction voltage regulator, and 3 is intermediate transformer, and 4 represent compensation condenser group, and 5 is precision measurement mutual inductor cabinet, and 6 represent product to be tested;
Fig. 2 is Capacitor banks compensation principle figure of the present invention.
Embodiment
As shown in Figure 1, the present invention includes high-tension switch cabinet 1, induction voltage regulator 2, intermediate transformer 3, two groups of oil immersed type compensation condenser groups 4, mutual inductor precision measurement unit 5 and experiment control system set of equipments, for testing product to be tested 6, product to be tested 6 is tested transformer.Induction voltage regulator 2, intermediate transformer 3, compensation condenser group 4 use private cable to be connected with precision measurement mutual inductor cabinet, mutual inductor precision measurement unit 5 is positioned at precision measurement mutual inductor cabinet, comprise a power cable and linear quadratic control cable, wherein each root of linear quadratic control cable all adopts the aviation plug of different core number, prevents from mispluging.
Apparatus of the present invention are exclusively used in 35 ~ 220kV electric pressure transformer field and carry out load loss measurement test, and it is as shown in table 1 that standard is followed in the present invention's design.
Table 1 manufactures and designs the standard of following
The power supply of apparatus of the present invention is three-phase 380V(power frequency 50Hz) capacity 500kW.Wherein, induction voltage regulator 2 rated capacity is 500kVA, is specifiedly input as 0.38kV/880A, and specified output is 0 ~ 0.65kV/444A.Intermediate transformer 3 rated capacity is 500kVA, and rated voltage is 0.65/ (1.9,3.3,11.0,6.3,17.3,23.1,30.0,40.0) kV, and regulative mode is that electronic off circuit tap changer regulates.Mutual inductor precision measurement unit 5 comprises voltage transformer (VT) summation current transformer, the scale of precision of voltage transformer (VT) is 0.01 grade, rated voltage and rated capacity are respectively 40.0kV, 0.5VA, and the scale of precision of current transformer is 0.01 grade, and rated voltage and rated capacity are respectively 40.0kV, 5VA.
In load test, because active loss is much smaller than perceptual reactive loss, the perception that the output capacity of testing equipment is mainly tested transformer is idle, proposes higher requirement to the capacity of experiment power supply, and therefore load loss test is at present confined to carry out in manufacturing plant substantially.Given this, the present invention adopts adjustable Capacitor banks in parallel with test product, utilizes the capacitive reactive power of compensation condenser group 4 to compensate the perception of tested transformer idle, thus the electric current effectively reducing power supply and pressure regulator exports, compensation principle as shown in Figure 2, wherein
z crepresent compensation condenser group equiva lent impedance,
z trepresent tested Transformer Short Circuit Impedance.For reaching good compensation effect, the capacitive reactive power of compensation condenser group 4 should be idle close to the perception of tested transformer, namely
z c≈
z t.According to calculating and economic comparison, the compensation condenser group 4 that the present invention adopts adopts 2 group capacitor group compositions, cause the difference of parameter according to tested transformer capacity difference, by the connected mode different to 2 group capacitor group selections, farthest can meet test needs.The present invention's 2 compensation condenser gross rated capacities are 10500kVar, rated voltage is respectively 11.0/19.0kV, manual shunting switch is taked to regulate input and the excision of each group of compensation condenser, be used for carrying out reactive-current compensation in transformer load loss process of the test, to reduce requirement to power supply capacity, thus make 35 ~ 220kV electric pressure Power Transformer in Field carry out load loss test to become possibility.
In sum, apparatus of the present invention theory structure is simple, breach the restriction of transformer load site test to power supply capacity demand, make 35 ~ 220kV electric pressure Power Transformer in Field carry out load loss measurement test and become possibility, thus effectively check winding material and the processing quality of transformer, improve power transformer safety operation level.
Claims (6)
1. a Power Transformer in Field load testing apparatus, for testing tested transformer, it is characterized in that: comprise power supply, high-tension switch cabinet, induction voltage regulator, intermediate transformer, compensation condenser group, mutual inductor precision measurement unit and experiment control system set of equipments, one side joint power supply of high-tension switch cabinet, the opposite side of high-tension switch cabinet connects induction voltage regulator, induction voltage regulator, intermediate transformer, compensation condenser group, mutual inductor precision measurement unit passes through connection successively, mutual inductor precision measurement unit is arranged in precision measurement mutual inductor cabinet, mutual inductor precision measurement unit comprises voltage transformer (VT) summation current transformer, compensation condenser group is made up of 2 group capacitor groups, and compensation condenser group equiva lent impedance is
z c, tested Transformer Short Circuit Impedance is
z t, then
z c≈
z t.
2. Power Transformer in Field load testing apparatus according to claim 1, is characterized in that: compensation condenser gross rated capacity is 10500kVar, and rated voltage is respectively 11.0/19.0kV.
3. Power Transformer in Field load testing apparatus according to claim 1 and 2, is characterized in that: power supply is three-phase 380V, capacity 500kW.
4. Power Transformer in Field load testing apparatus according to claim 1 and 2, is characterized in that: the rated capacity of induction voltage regulator is 500kVA, is specifiedly input as 0.38kV/880A, and specified output is 0 ~ 0.65kV/444A.
5. Power Transformer in Field load testing apparatus according to claim 1 and 2, is characterized in that: intermediate transformer rated capacity is 500kVA, and regulative mode is that electronic off circuit tap changer regulates.
6. Power Transformer in Field load testing apparatus according to claim 1 and 2, it is characterized in that: the scale of precision of the voltage transformer (VT) of mutual inductor precision measurement unit is 0.01 grade, rated voltage and rated capacity are respectively 40.0kV, 0.5VA, the scale of precision of the current transformer of mutual inductor precision measurement unit is 0.01 grade, and rated voltage and rated capacity are respectively 40.0kV, 5VA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520068077.2U CN204359884U (en) | 2015-01-30 | 2015-01-30 | A kind of Power Transformer in Field load testing apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520068077.2U CN204359884U (en) | 2015-01-30 | 2015-01-30 | A kind of Power Transformer in Field load testing apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104635083A (en) * | 2015-01-30 | 2015-05-20 | 国网河南省电力公司电力科学研究院 | Field load testing device for power transformer |
| CN105807172A (en) * | 2016-06-01 | 2016-07-27 | 国家电网公司 | Ultrahigh voltage substation simulated operation verifying system |
-
2015
- 2015-01-30 CN CN201520068077.2U patent/CN204359884U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104635083A (en) * | 2015-01-30 | 2015-05-20 | 国网河南省电力公司电力科学研究院 | Field load testing device for power transformer |
| CN105807172A (en) * | 2016-06-01 | 2016-07-27 | 国家电网公司 | Ultrahigh voltage substation simulated operation verifying system |
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