CN201007733Y - Transformer winding deformation detection determining device - Google Patents
Transformer winding deformation detection determining device Download PDFInfo
- Publication number
- CN201007733Y CN201007733Y CNU200720031262XU CN200720031262U CN201007733Y CN 201007733 Y CN201007733 Y CN 201007733Y CN U200720031262X U CNU200720031262X U CN U200720031262XU CN 200720031262 U CN200720031262 U CN 200720031262U CN 201007733 Y CN201007733 Y CN 201007733Y
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- current transformer
- voltage transformer
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Abstract
The utility model relates to a detecting and diagnosis device of winding deformation of a power transformer, which is correct in testing and high in accuracy and belongs to a failure detection device of power equipments. The device comprises a voltage transformer, a current transformer, a detecting circuit and a computer. The voltage transformer and the current transformer are arranged inside a metal shielding outer case. The computer is connected with the detecting circuit which is connected with output ends of the voltage transformer and the current transformer. The detecting circuit is composed of a zero magnetic flux compensating circuit of the transformers, a filtering and shaping circuit, an amplifying circuit, an analogue/digital conversion circuit and a digital processing circuit, wherein all the components are sequentially connected. A primary coil and a secondary coil and the outer layer of the voltage transformer and the current transformer are arranged with a metal screening layer. The screening measures are taken for the voltage transformer and the current transformer disposed inside the detecting and diagnosis device of the utility model, the detecting circuit combines a hardware filter circuit with software digital filter, thereby greatly increasing capability of heavy electromagnetic interference immunity.
Description
Technical field
The utility model belongs to the fault-locating unit of power equipment, and specifically a kind of deformation of transformer winding detects judgment means.
Background technology
Power transformer is a most important main equipment in the electric power system, and the transformer damage accident that in a single day happens suddenly will cause large-scale sudden power failure, cause to national economy to have a strong impact on.The main cause that causes the sudden damage accident of power transformer be since transformer in transportation or electric system when being short-circuited, Transformer Winding is subjected to powerful mechanical force or electric power is impacted, winding will deform or displacement, thereby cause winding insulation impaired, hidden danger breaks down.Therefore, carrying out detection and diagnosis to deformation of transformer winding, to the transformer arrangement maintenance of existing scar, is the important measures that improve the transformer safe operation in time.
At present, the method that is used for the measuring transformer winding deformation both at home and abroad have dc resistance method, winding to winding equivalent capacitance method over the ground, no-load current and open circuit loss method, the frequency response analysis (as the disclosed frequency response analysis detection method of Chinese patent CN200510029143) etc. of measuring transformer.Because measure at the scene and be subjected to condition restriction, there is strong electromagnetic again in the transformer station scene, above several method all has certain limitation, exists to detect loaded down with trivial details, shortcomings such as measuring error is big, precision is low, reproducibility difference.In addition, according to the requirement of power transformer testing regulations, trial voltage will be raised under the transformer high-voltage side load current value during Transformer Plant Test and test, the trial voltage value is a high pressure, tests in the high-potting station usually.The applicant thinks, if can adopt low-voltage to detect at the transformer station scene, then will make things convenient for the detection and the maintenance of transformer greatly.
Summary of the invention
Problem to be solved in the utility model is: a kind of deformation of transformer winding detection judgment means accurate, that precision is high that detects is provided.
The technical scheme that addresses the above problem is: the deformation of transformer winding that is provided detects judgment means and comprises voltage transformer (VT), current transformer, testing circuit that is connected with aforementioned mutual inductor output terminal that places in the metallic shield shell and the computing machine that is connected with testing circuit; Described testing circuit is made up of the mutual inductor that connects successively zero flux compensation circuit, filtering shaping circuit, amplifying circuit, mould/number conversion circuit and digital processing circuit; The primary winding of described voltage transformer (VT) summation current transformer, secondary coil and skin are provided with metal screen layer.Mutual inductor is sampled to voltage, the electric current of transformer during detection, obtains the parameter such as short-circuit reactance, short-circuit impedance, impedance voltage, leakage inductance of transformer after the treated calculating, delivers to computing machine then to compare, thereby judges whether winding is out of shape.
Above-mentioned digital processing circuit can be made up of DSP digital processing circuit and CPLD programmable integrated circuit.
Mutual inductor has been taked above-mentioned shielding measure in the utility model device, and testing circuit has adopted the hardware filtering circuit to combine with software digital filter, thereby has improved the ability of anti-strong electromagnetic greatly, has guaranteed the accuracy and the reliability of measurement data.The utility model makes the magnetic flux of mutual inductor be in null range by the mutual inductor compensating circuit, and has adopted high precision amplifying circuit, mould/number conversion circuit, thereby has improved accuracy of detection.
The utility model has overcome to be needed in the traditional measurement can easily transformer voltage in three phases, current instantaneous value be locked and reading simultaneously by computer control with the drawback that many instrument combine brought, and the reproducibility of measurement data is improved greatly.This pick-up unit only need 220 volts of civil powers or more low-voltage (as 15 volts) power supply get final product, have easy to operate, measure advantages such as accurate, that workload is little and reproducibility is good.Simultaneously also be convenient to make power transformer to detect diagnostic techniques and realize detecting robotization and intellectual management.
Description of drawings
Fig. 1 is the circuit theory diagrams of an embodiment of the utility model.
Fig. 2 is the schematic diagram of mutual inductor zero flux compensation circuit among Fig. 1.
Fig. 3 is the shielding construction synoptic diagram of the utility model mutual inductor.
Embodiment
Below in conjunction with accompanying drawing content of the present utility model is described in detail.
As shown in Figure 1: A phase voltage mutual inductor 21 summation current transformers 22 of pick-up unit are connected on the A phase high-pressure side of tested transformer 1.A phase voltage mutual inductor 21, A phase voltage mutual inductor zero flux compensation circuit 31, A phase voltage digital filtering shaping circuit 41, A phase voltage programmable amplifying circuit 51 and A phase voltage mould/number conversion circuit 61 join successively, A phase current mutual inductor 22, A phase current mutual inductor zero flux compensation circuit 32, A phase current digital filtering shaping circuit 42, A phase current programmable amplifying circuit 52 and A phase current mould/number conversion circuit 62 join successively, A phase voltage mould/number conversion circuit 61 and current-mode/number conversion circuit 62 joins with DSP digital processing circuit 7 again, DSP digital processing circuit 7 joins with the CPLD programmable integrated circuit, is connected with computing machine 10 by communication interface circuit 9 then.The B phase and the circuit identical (in figure do not draw) of C circuitry phase structure of pick-up unit with above-mentioned A phase.It is the TMS320VC element that DSP digital operation treatment circuit among Fig. 1 adopts model, and it is that AD677KN element CPLD programmable integrated circuit employing model is the EPM7256AETDSPTMS320VC element that mould/number conversion circuit adopts model.
As shown in Figure 2: above-mentioned voltage transformer (VT) zero flux compensation circuit 31, current transformer zero flux compensation circuit 32 are by the compensating coil W on the mutual inductor iron core
3, the inverting amplifier that is connected with this compensating coil 33 forms the output terminal of inverting amplifier 33 and mutual inductor secondary coil W
2Serial connection.The induction electromotive force of compensating coil offsets with the induced potential of mutual inductor secondary coil after anti-phase through amplifying, and makes the magnetic flux in the transformer iron core approach zero, thereby has improved the precision of mutual inductor greatly.For further improving precision, the mutual inductor of this example employing unshakable in one's determination glass is alloy not, and the precision of mutual inductor can reach 50PPM.All the other numberings: W among the figure
1Be the mutual inductor primary winding, R is the transformer secondary circuit load.
As shown in Figure 3: above-mentioned voltage, current transformer have all adopted the double shield measure, have promptly wrapped up one deck Copper Foil screen layer 25,26 respectively in the outside of mutual inductor primary winding 23 and secondary coil 24,0.02 millimeter of copper thickness, and unshakable in one's determination 27 adopt not alloy of glass.
During detection according to the connection group of tested Transformer Winding, adopt the corresponding mode of connection that pick-up unit is connected with tested transformer, tested voltage, current value converts weak electric signal to through mutual inductor and samples, mutual inductor adopts zero flux compensation circuit that mutual inductor linearity and angular difference are carried out the high precision correction, detected voltage, electric current is handled through the digital filtering shaping circuit, automatically carry out signal amplification or decay through programmable amplifying circuit again, mould/number conversion circuit is to three (A, B, the C three-phase) magnitude of voltage, three (A, B, the C three-phase) current value locks simultaneously, reading, convert analog quantity to digital quantity, pass through the DSP digital processing circuit again, the CPLD integrated circuit carries out data operation, and it is as follows to calculate winding parameter: the three-phase effective voltage, the three-phase watt current, three phase power, average voltage, average current, three-phase phase-splitting power factor, supply frequency etc.; Calculate short-circuit reactance, short-circuit impedance, impedance voltage, leakage inductance, no-load current, open circuit loss again.Above-mentioned winding parameter is transferred to computing machine by communication interface circuit, by analysis, relatively, judges the distortion situation of tested Transformer Winding.
The analysis criterion of using this pick-up unit is according to being the winding parameter that will measure, as short-circuit reactance, short-circuit impedance, impedance voltage, leakage inductance, undertaken by following requirement:
(1) vertical ratio: capacity 100MVA and relative variation following and the Winding in Power Transformer parameter that voltage 220kV is following all should be greater than ± 2.0%;
(2) vertical ratio: the relative variation of above or voltage 220kV of capacity 100MVA and above Winding in Power Transformer parameter should be greater than ± 1.6%;
(3) horizontal ratio: capacity 100MVA and maximal phase following and three single-phase parameters of Winding in Power Transformer that voltage 220kV is following should be greater than 2.5% to mutual deviation;
(4) horizontal ratio: the maximal phase of the above or voltage 220kV of capacity 100MVA and above three single-phase parameters of Winding in Power Transformer should be greater than 2.0% to mutual deviation.
Vertical ratio is meant the original detected value of Transformer Winding parameter and this detected value is compared that horizontal ratio is meant that the winding parameter with this detection carries out alternate comparison.If comparative result exceeds afore mentioned rules, show that then Transformer Winding has the distortion fault.
The detected winding parameter measurement data of this pick-up unit, reproducibility have reached GB fully and have required 0.2 grade of index.
This pick-up unit voltage input circuit and electric current input circuit have adopted high precision zero magnetic flux mutual inductor, and its advantage is that precision height, good linearity, volume are little, the voltage measurement scope reaches 15～500V, and current measuring range has reached 0.03～60A.
Claims (4)
1. a deformation of transformer winding detects judgment means, it is characterized in that comprising voltage transformer (VT) (21), current transformer (22), testing circuit that is connected with aforementioned mutual inductor output terminal that places in the metallic shield shell and the computing machine (10) that is connected with testing circuit; Described testing circuit is made up of the mutual inductor that connects successively zero flux compensation circuit (31,32), filtering shaping circuit (41,42), amplifying circuit (51,52), mould/number conversion circuit (61,62) and digital processing circuit; Primary winding, secondary coil and the skin of described voltage transformer (VT) (21) summation current transformer (22) are provided with metal screen layer.
2. pick-up unit according to claim 1 is characterized in that said voltage transformer (VT) zero flux compensation circuit (31), current transformer zero flux compensation circuit (32) are by the compensating coil (W on the mutual inductor iron core
3), with this compensating coil (W
3) inverting amplifier (33) that connects forms the output terminal of inverting amplifier and mutual inductor secondary coil (W
2) serial connection.
3. pick-up unit according to claim 2 is characterized in that said digital processing circuit is made up of DSP digital processing circuit and CPLD programmable integrated circuit.
4. pick-up unit according to claim 3 is characterized in that primary winding, secondary coil and the outer field metal screen layer of said voltage transformer (VT) (21) summation current transformer (22) is Copper Foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720031262XU CN201007733Y (en) | 2007-02-15 | 2007-02-15 | Transformer winding deformation detection determining device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720031262XU CN201007733Y (en) | 2007-02-15 | 2007-02-15 | Transformer winding deformation detection determining device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201007733Y true CN201007733Y (en) | 2008-01-16 |
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ID=39003680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720031262XU Expired - Fee Related CN201007733Y (en) | 2007-02-15 | 2007-02-15 | Transformer winding deformation detection determining device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201007733Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944811A (en) * | 2012-11-23 | 2013-02-27 | 宁夏电力公司电力科学研究院 | Judgment method of transformer winding deformation |
| CN103575970A (en) * | 2013-11-14 | 2014-02-12 | 国家电网公司 | Transformer grounding current monitoring device and system |
| CN104111027A (en) * | 2014-07-29 | 2014-10-22 | 国家电网公司 | Lissajous figure analytical method based transformer power frequency signal sensor system |
| CN104407240A (en) * | 2014-11-11 | 2015-03-11 | 国家电网公司 | Loss online detecting system for three-winding transformer and loss calculating method |
| CN106507654A (en) * | 2016-10-14 | 2017-03-15 | 国网上海市电力公司 | A kind of anti-interference isolation and communication device for extra-high voltage equipment vibration-testing |
| CN106767375A (en) * | 2016-11-29 | 2017-05-31 | 武汉振源电气股份有限公司 | Three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method |
| CN107782971A (en) * | 2016-08-29 | 2018-03-09 | 武汉盛捷达电力科技有限责任公司 | A kind of online reactance measurement device for being adaptive to 2 windings and 3 windings |
| FR3088476A1 (en) * | 2018-11-08 | 2020-05-15 | Thales | METHOD FOR DETECTION AND TRANSMISSION OF SLEEPING FAILURE INFORMATION |
| CN112902824A (en) * | 2021-01-20 | 2021-06-04 | 国网河北省电力有限公司 | Method for rapidly judging deformation of internal winding of main transformer equipment |
| CN114371429A (en) * | 2022-01-13 | 2022-04-19 | 云南电网有限责任公司电力科学研究院 | Method and device for detecting deformation of transformer winding on line |
-
2007
- 2007-02-15 CN CNU200720031262XU patent/CN201007733Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944811B (en) * | 2012-11-23 | 2015-01-14 | 宁夏电力公司电力科学研究院 | Detection method of transformer winding deformation |
| CN102944811A (en) * | 2012-11-23 | 2013-02-27 | 宁夏电力公司电力科学研究院 | Judgment method of transformer winding deformation |
| CN103575970A (en) * | 2013-11-14 | 2014-02-12 | 国家电网公司 | Transformer grounding current monitoring device and system |
| CN104111027A (en) * | 2014-07-29 | 2014-10-22 | 国家电网公司 | Lissajous figure analytical method based transformer power frequency signal sensor system |
| CN104111027B (en) * | 2014-07-29 | 2017-02-15 | 国家电网公司 | Lissajous figure analytical method based transformer power frequency signal sensor system |
| CN104407240A (en) * | 2014-11-11 | 2015-03-11 | 国家电网公司 | Loss online detecting system for three-winding transformer and loss calculating method |
| CN107782971A (en) * | 2016-08-29 | 2018-03-09 | 武汉盛捷达电力科技有限责任公司 | A kind of online reactance measurement device for being adaptive to 2 windings and 3 windings |
| CN106507654A (en) * | 2016-10-14 | 2017-03-15 | 国网上海市电力公司 | A kind of anti-interference isolation and communication device for extra-high voltage equipment vibration-testing |
| CN106767375A (en) * | 2016-11-29 | 2017-05-31 | 武汉振源电气股份有限公司 | Three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method |
| CN106767375B (en) * | 2016-11-29 | 2019-04-26 | 武汉振源电气股份有限公司 | Three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method |
| FR3088476A1 (en) * | 2018-11-08 | 2020-05-15 | Thales | METHOD FOR DETECTION AND TRANSMISSION OF SLEEPING FAILURE INFORMATION |
| EP3654045A1 (en) * | 2018-11-08 | 2020-05-20 | Thales | Method for detecting and transmitting information about a dormant failure |
| US11005258B2 (en) | 2018-11-08 | 2021-05-11 | Thales | Method for detecting and transmitting dormant failure information |
| CN112902824A (en) * | 2021-01-20 | 2021-06-04 | 国网河北省电力有限公司 | Method for rapidly judging deformation of internal winding of main transformer equipment |
| CN114371429A (en) * | 2022-01-13 | 2022-04-19 | 云南电网有限责任公司电力科学研究院 | Method and device for detecting deformation of transformer winding on line |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080116 Termination date: 20130215 |