CN105262075A - End screen protective circuit applied to electrification deformation detection of transformer winding and application thereof - Google Patents
End screen protective circuit applied to electrification deformation detection of transformer winding and application thereof Download PDFInfo
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- CN105262075A CN105262075A CN201510802629.2A CN201510802629A CN105262075A CN 105262075 A CN105262075 A CN 105262075A CN 201510802629 A CN201510802629 A CN 201510802629A CN 105262075 A CN105262075 A CN 105262075A
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Abstract
The invention discloses an end screen protective circuit applied to electrification deformation detection of a transformer winding and an application thereof. The end screen protective circuit is characterized in that an inductor L is connected between a connection terminal and a grounding terminal of a sleeve end screen in series; a proper inductance value is selected, such that the inductive reactance of the inductor L is the same to a capacitive reactance value of a ground capacitance C of the sleeve end screen and the polarities are opposite under 50Hz power-frequency voltage; a piezoresistor R and a gas discharge tube SP are arranged on the inductor L in parallel; and thus, the end screen protective circuit is formed. By means of the invention, electrification deformation detection of the transformer winding is directly carried out when a transformer operates normally and the sleeve end screen is grounded effectively; influence of residual voltage signals of an end screen to apply test signals can be eliminated; online real-time state monitoring of the state transformer winding can be effectively realized; and safe and stable operations of a power grid can be ensured.
Description
Technical field
The present invention relates to high potential test for electric equipment field, is more particularly a kind of end shield protective circuit and detection method of being applied to deformation of transformer winding live detection.
Background technology
External short circuit is the most common failure of Transformer, and under the electrodynamic action of big current, winding easily slight deformation occurs.The slight deformation of Transformer Winding may cause the Local Damaged that winding insulation is small, and affected area easily produces partial discharge, aggravation insulation ag(e)ing rate, insulation affected area is constantly expanded, meanwhile, the degree of deformation of transformer winding is constantly aggravated, once there is serious external short circuit fault, winding interturn short-circuit may be caused in inside transformer, and then cause the badly damaged even entirety of Transformer Winding to scrap.Therefore, strengthen the testing and monitoring to Transformer Winding Light deformation, formulate effective Short Circuit withstand prophylactico-therapeutic measures according to the transformer distortion order of severity, transformer operation stability can be increased substantially, reduce the transformer damage because short trouble causes, guarantee electric power netting safe running.
For the transformer of the normal 220kV run, considering that sleeve pipe main capacitance and its direct-to-ground capacitance are substantially at about 1:10, there is the residual voltage of about 20kV in end shield of high-voltage bushing place, and in order to prevent flashover, during normal operation, end shield generally does grounding.When carrying out deformation of transformer winding live detection, need to inject test signal at end shield of high-voltage bushing place, and for Injection Signal, residual voltage signal can produce strong interference for applying test signal, and the normal output of testing source can be had influence on, even may destroy signal source.At present, there is no effective ways and can ensure end shield effective grounding, end shield residual voltage can be eliminated again on testing source and the impact applying signal simultaneously, cause carrying out monitor to transformer winding state by live detection means and detecting, be unfavorable for the safe and stable operation of electrical network and equipment.
Summary of the invention
The present invention is the weak point for avoiding existing for above-mentioned prior art, a kind of the end shield protective circuit and the application thereof that are applied to deformation of transformer winding live detection are provided, deformation of transformer winding live detection is carried out to injecting test signal from bottom shielding of bushing when ensureing that transformer normally runs when bottom shielding of bushing effective grounding, eliminate end shield residual voltage signal for the impact applying test signal simultaneously, in order to avoid it has influence on the normal output of testing source and the destruction to signal source, realize carrying out monitor by live detection means to transformer winding state and detecting, guarantee power network safety operation.
The present invention is that technical solution problem adopts following technical scheme:
The feature that the present invention is applied to the end shield protective circuit of deformation of transformer winding live detection is: between bottom shielding of bushing splicing ear and earth terminal, be connected in series an inductance L, choose suitable inductance value to meet under the voltage of power frequency 50Hz, the induction reactance of inductance L is identical with the capacitive reactance numerical value of bottom shielding of bushing direct-to-ground capacitance C, and polarity is contrary; Described inductance L is arranged in parallel piezo-resistance R and gas discharge tube SP, forms end shield protective circuit.
The feature of deformation of transformer winding electrified detection circuit of the present invention is: adopt described end shield protective circuit; at described end shield splicing ear, one test signal connectivity port is at one end set; utilize in described test signal connectivity port deformation of transformer winding tester to inject and collecting test signal, form deformation of transformer winding electrified detection circuit.
The feature of deformation of transformer winding measuring device with electricity of the present invention is: on the head end outlet casing tube end shield splicing ear of Transformer Winding head end outlet casing tube, connect head end outlet casing tube end shield protective circuit by insulated copper wire, and the tail end outlet casing tube end shield splicing ear of Transformer Winding tail end outlet casing tube connects tail end outlet casing tube bottom shielding of bushing protective circuit by insulated copper wire;
Described head end outlet casing tube end shield protective circuit and tail end outlet casing tube bottom shielding of bushing protective circuit adopt described end shield protective circuit;
The signal output port of winding deformation tester is connected by test lead with the test signal connectivity port of head end outlet casing tube end shield protective circuit; The signal input port of described winding deformation tester is connected by test lead with the test signal connectivity port of tail end outlet casing tube bottom shielding of bushing protective circuit (5b).
The feature that the present invention utilizes checkout gear to realize the method for deformation of transformer winding live detection is:
When transformer normally runs and does not carry out deformation of transformer winding live detection, the test signal connectivity port of described head end outlet casing tube end shield protective circuit and tail end outlet casing tube bottom shielding of bushing protective circuit is vacant, under the voltage of power frequency 50Hz, head end outlet casing tube end shield splicing ear by described head end outlet casing tube end shield protective circuit equivalence ground connection, tail end outlet casing tube end shield splicing ear by the equivalent ground connection of described tail end outlet casing tube end shield protective circuit; When transformer normally runs and carries out deformation of transformer winding live detection, winding deformation tester injects high frequency test signals by signal output port to head end outlet casing tube end shield protective circuit, reads the output signal of tail end outlet casing tube bottom shielding of bushing protective circuit as detection signal by the signal input port of described winding deformation tester;
The amplitude-frequency response characteristic of operating frequency response method to described detection signal is analyzed, and by comparing historical data or different phase transformer winding deformation test result, judges deformation of transformer winding degree.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention is that middle end shield protective circuit can guarantee Transformer Bushing Tap effective grounding under normal operating conditions; eliminate end shield residual voltage for the impact of injecting test signal from bottom shielding of bushing, in order to avoid it has influence on the normal output of testing source or destroys signal source simultaneously.
2, protective circuit of the present invention is adopted can to pass through to inject winding deformation test signal from Transformer Bushing Tap; realize carrying out under running state of transformer not having a power failure and detect the test of transformer winding state; solve the limitation that prior art is merely able to carry out winding deformation detection under transformer has a power failure dismounting lead-in wire state; ensure that the Real-Time Monitoring to Transformer Winding, ensure that the safe and stable operation of transformer.
Accompanying drawing illustrates:
Fig. 1 is ins and outs screen protection protection circuit circuit diagram;
Fig. 2 is the test circuit figure of deformation of transformer winding live detection;
Embodiment
See Fig. 1 and Fig. 2, the end shield protective circuit being applied to deformation of transformer winding live detection in the present embodiment is connected in series an inductance L between bottom shielding of bushing splicing ear 2 and earth terminal 3, choose suitable inductance value to meet under the voltage of power frequency 50Hz, the induction reactance of inductance L is identical with the capacitive reactance numerical value of bottom shielding of bushing direct-to-ground capacitance C, and polarity is contrary; Inductance L is arranged in parallel piezo-resistance R and gas discharge tube SP, forms end shield protective circuit.
In the present embodiment, deformation of transformer winding electrified detection circuit adopts end shield protective circuit; at end shield splicing ear 2, a test signal connectivity port 1 is at one end set; utilize in test signal connectivity port 1 deformation of transformer winding tester 8 to inject and collecting test signal, form deformation of transformer winding electrified detection circuit.
In the present embodiment, deformation of transformer winding measuring device with electricity connects head end outlet casing tube end shield protective circuit 5a by insulated copper wire on the head end outlet casing tube end shield splicing ear 9a of Transformer Winding head end outlet casing tube 7a, and the tail end outlet casing tube end shield splicing ear 9b of Transformer Winding tail end outlet casing tube 7b connects tail end outlet casing tube bottom shielding of bushing protective circuit 5b by insulated copper wire.
Head end outlet casing tube end shield protective circuit 5a and tail end outlet casing tube bottom shielding of bushing protective circuit 5b adopts end shield protective circuit in the present embodiment.
The signal output port P of winding deformation tester 8 is connected by test lead with the test signal connectivity port 1 of head end outlet casing tube end shield protective circuit 5a; The signal input port I of winding deformation tester 8 is connected by test lead with the test signal connectivity port 1 of tail end outlet casing tube bottom shielding of bushing protective circuit 5b.
The method utilizing the present embodiment checkout gear to realize deformation of transformer winding live detection is:
When transformer normally runs and does not carry out deformation of transformer winding live detection, the test signal connectivity port 1 of head end outlet casing tube end shield protective circuit 5a and tail end outlet casing tube bottom shielding of bushing protective circuit 5b is vacant, under the voltage of power frequency 50Hz, head end outlet casing tube end shield splicing ear 9a passes through tail end outlet casing tube end shield protective circuit 5b equivalence ground connection by head end outlet casing tube end shield protective circuit 5a equivalence ground connection, tail end outlet casing tube end shield splicing ear 9b, when transformer normally runs and carries out deformation of transformer winding live detection, winding deformation tester 8 injects high frequency test signals by signal output port P to head end outlet casing tube end shield protective circuit 5a, after high frequency test signals is coupled by head end outlet casing tube end shield protective circuit 5a, inject head end outlet casing tube end shield and be coupled into Transformer Winding 6 by Transformer Winding head end outlet casing tube 7a, the output signal of tail end outlet casing tube bottom shielding of bushing protective circuit 5b is read as detection signal by the signal input port I of winding deformation tester 8, test output signal is coupled to tail end outlet casing tube end shield by Transformer Winding tail end outlet casing tube 7b, and after being coupled by tail end outlet casing tube end shield protective circuit 5b, enter the signal input port I of winding deformation tester 8, as detection signal.
Being that the amplitude-frequency response characteristic of operating frequency response method to detection signal is analyzed for detection signal in the present embodiment, by comparing historical data or different phase transformer winding deformation test result, judging deformation of transformer winding degree.
As depicted in figs. 1 and 2; inductance L in the present embodiment in end shield protective circuit and direct-to-ground capacitance C form high pass filter jointly; winding deformation frequency test signal is set to 2MHz to 20MHz, and this test signal can be coupled into transformer high-voltage bushing by high pass filter.Meanwhile, for the normal 220kV transformer run, sleeve pipe main capacitance is generally 400pF, and direct-to-ground capacitance is about about 4000pF, and end shield place exists the residual voltage of about 20kV, and in order to prevent flashover, during normal operation, end shield does grounding usually.Select 50mH inductance, the impedance ratio of main capacitance branch road and direct-to-ground capacitance branch road can be made to reach more than 100000:1, thus the voltage of 20kV is suppressed to below 5V, guarantee the safe operation of experimental facilities.Inductance L in end shield protective circuit and need between end shield direct-to-ground capacitance C approximate to meet following formula: L=1/ (4 π
2f
2c), f is power frequency 50Hz.Piezo-resistance R and gas discharge tube SP is the backup protection as L-C high pass filter, is used for transient suppression overvoltage.
The piezo-resistance model that protective circuit is selected is 20D221K, and its parameter is as shown in table 1:
The coefficient correlation of table 120D221K
The gas discharge tube model selected is 2RM230L-8, and its parameter is as shown in table 2:
The coefficient correlation of table 22RM230L-8
Claims (4)
1. one kind is applied to the end shield protective circuit of deformation of transformer winding live detection, it is characterized in that: between bottom shielding of bushing splicing ear (2) and earth terminal (3), be connected in series an inductance L, choose suitable inductance value to meet under the voltage of power frequency 50Hz, the induction reactance of inductance L is identical with the capacitive reactance numerical value of bottom shielding of bushing direct-to-ground capacitance C, and polarity is contrary; Described inductance L is arranged in parallel piezo-resistance R and gas discharge tube SP, forms end shield protective circuit.
2. a deformation of transformer winding electrified detection circuit; it is characterized in that: adopt end shield protective circuit according to claim 1; described end shield splicing ear (2), a test signal connectivity port (1) is at one end set; utilize deformation of transformer winding tester (8) to inject and collecting test signal described test signal connectivity port (1), form deformation of transformer winding electrified detection circuit.
3. a deformation of transformer winding measuring device with electricity, it is characterized in that: in head end outlet casing tube end shield splicing ear (9a) of Transformer Winding head end outlet casing tube (7a), connect head end outlet casing tube end shield protective circuit (5a) by insulated copper wire, tail end outlet casing tube end shield splicing ear (9b) of Transformer Winding tail end outlet casing tube (7b) connects tail end outlet casing tube bottom shielding of bushing protective circuit (5b) by insulated copper wire;
Described head end outlet casing tube end shield protective circuit (5a) and tail end outlet casing tube bottom shielding of bushing protective circuit (5b) adopt end shield protective circuit described in claim 1;
The signal output port (P) of winding deformation tester (8) is connected by test lead with the test signal connectivity port (1) of head end outlet casing tube end shield protective circuit (5a); The signal input port (I) of described winding deformation tester (8) is connected by test lead with the test signal connectivity port (1) of tail end outlet casing tube bottom shielding of bushing protective circuit (5b).
4. utilize checkout gear described in claim 3 to realize the method for deformation of transformer winding live detection, it is characterized in that:
When transformer normally runs and does not carry out deformation of transformer winding live detection, the test signal connectivity port (1) of described head end outlet casing tube end shield protective circuit (5a) and tail end outlet casing tube bottom shielding of bushing protective circuit (5b) is vacant, under the voltage of power frequency 50Hz, head end outlet casing tube end shield splicing ear (9a) by described head end outlet casing tube end shield protective circuit (5a) equivalent ground connection, tail end outlet casing tube end shield splicing ear (9b) by described tail end outlet casing tube end shield protective circuit (5b) equivalent ground connection; When transformer normally runs and carries out deformation of transformer winding live detection, winding deformation tester (8) injects high frequency test signals by signal output port (P) to head end outlet casing tube end shield protective circuit (5a), reads the output signal of tail end outlet casing tube bottom shielding of bushing protective circuit (5b) as detection signal by the signal input port (I) of described winding deformation tester (8);
The amplitude-frequency response characteristic of operating frequency response method to described detection signal is analyzed, and by comparing historical data or different phase transformer winding deformation test result, judges deformation of transformer winding degree.
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Cited By (6)
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| CN106526409A (en) * | 2016-10-28 | 2017-03-22 | 华北电力大学（保定） | Transformer winding deformation live testing system and testing method thereof |
| CN109525212A (en) * | 2018-12-29 | 2019-03-26 | 西安交通大学 | A kind of intelligent scanning signal processing unit and working method |
| CN110596545A (en) * | 2019-09-04 | 2019-12-20 | 国网江苏省电力有限公司电力科学研究院 | Partial discharge detection device and detection method based on combined action of alternating current and impulse voltage |
| CN110794344A (en) * | 2019-11-04 | 2020-02-14 | 国网陕西省电力公司铜川供电公司 | Frequency response test method for transformer winding deformation with influence of sleeve eliminated |
| CN110907824A (en) * | 2019-11-06 | 2020-03-24 | 天津工业大学 | Motor fault detection system based on high-frequency signal coupling injection |
| CN111175617A (en) * | 2019-12-31 | 2020-05-19 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and system for simulating and determining breakdown fault of high-voltage bushing capacitance layer |
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| CN205081467U (en) * | 2015-11-19 | 2016-03-09 | 国家电网公司 | Be applied to end screen protection circuit that electric -examination of transformer winding deformation band was surveyed |
| CN205090931U (en) * | 2015-11-19 | 2016-03-16 | 国家电网公司 | Transformer winding deformation band electrical detection circuitry |
| CN205156847U (en) * | 2015-11-19 | 2016-04-13 | 国家电网公司 | Transformer winding deformation band electric detection means |
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| CN205081467U (en) * | 2015-11-19 | 2016-03-09 | 国家电网公司 | Be applied to end screen protection circuit that electric -examination of transformer winding deformation band was surveyed |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106526409A (en) * | 2016-10-28 | 2017-03-22 | 华北电力大学（保定） | Transformer winding deformation live testing system and testing method thereof |
| CN106526409B (en) * | 2016-10-28 | 2019-03-15 | 华北电力大学（保定） | A kind of deformation of transformer winding live testing system and its test method |
| CN109525212A (en) * | 2018-12-29 | 2019-03-26 | 西安交通大学 | A kind of intelligent scanning signal processing unit and working method |
| CN110596545A (en) * | 2019-09-04 | 2019-12-20 | 国网江苏省电力有限公司电力科学研究院 | Partial discharge detection device and detection method based on combined action of alternating current and impulse voltage |
| CN110794344A (en) * | 2019-11-04 | 2020-02-14 | 国网陕西省电力公司铜川供电公司 | Frequency response test method for transformer winding deformation with influence of sleeve eliminated |
| CN110794344B (en) * | 2019-11-04 | 2022-01-25 | 国网陕西省电力公司铜川供电公司 | Frequency response test method for transformer winding deformation with influence of sleeve eliminated |
| CN110907824A (en) * | 2019-11-06 | 2020-03-24 | 天津工业大学 | Motor fault detection system based on high-frequency signal coupling injection |
| CN111175617A (en) * | 2019-12-31 | 2020-05-19 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and system for simulating and determining breakdown fault of high-voltage bushing capacitance layer |
| CN111175617B (en) * | 2019-12-31 | 2022-04-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and system for simulating and determining breakdown fault of high-voltage bushing capacitance layer |
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