CN205090931U - Transformer winding deformation band electrical detection circuitry - Google Patents
Transformer winding deformation band electrical detection circuitry Download PDFInfo
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- CN205090931U CN205090931U CN201520931897.XU CN201520931897U CN205090931U CN 205090931 U CN205090931 U CN 205090931U CN 201520931897 U CN201520931897 U CN 201520931897U CN 205090931 U CN205090931 U CN 205090931U
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- 238000004804 winding Methods 0.000 title claims abstract description 52
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 230000006698 induction Effects 0.000 claims abstract description 4
- 230000001419 dependent effect Effects 0.000 claims description 5
- 238000009413 insulation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 101100460844 Mus musculus Nr2f6 gene Proteins 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
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- 230000001629 suppression Effects 0.000 description 1
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Abstract
The utility model discloses a transformer winding deformation band electrical detection circuitry, characterized by is a series connection inductance between sleeve pipe end screen connecting terminal and ground terminal, chooses suitable inductance value in order satisfying under power frequency 50Hz's the voltage, and the induction reactance of inductance is the same with the capacitive reactance numerical value that the direct -to -ground capacitance is shielded at the sleeve pipe end, and polarity is opposite, parallelly connected piezo -resistor and the gas discharge tube component end screen protection circuit of setting up on the inductance, set up a test signal connection port in end screen connecting terminal place one end test signal connection port utilizes the transformer winding deformation test appearance to pour into into and gathers test signal, constitutes transformer winding deformation band electrical detection circuitry. Utilize the utility model discloses transformer winding deformation band electric -examination survey is directly develoied to sleeve pipe end screen effectively grounded's the condition in the time of can ensureing transformer normal operating to the influence of the end remaining voltage signal of screen to applying test signal can be eliminated, the online real -time supervision to the transformer winding state can be realized effectively.
Description
Technical field
The utility model relates to high potential test for electric equipment field, is more particularly a kind of end shield protection circuit 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 shelf depreciation, 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 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.
Utility model content
The utility model is the weak point for avoiding existing for above-mentioned prior art, a kind of deformation of transformer winding electrified detection circuit is 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 utility model is that technical solution problem adopts following technical scheme:
The design feature of the utility model deformation of transformer winding electrified detection circuit is: between bottom shielding of bushing splicing ear and ground 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 ground capacitance C, and polarity is contrary; Described inductance L is arranged in parallel voltage dependent resistor (VDR) R and gas-discharge tube SP; form end shield protection 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.
Compared with the prior art, the utility model beneficial effect is embodied in:
1, the utility model is that middle end shield protection 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, the utility model protection circuit 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, deformation of transformer winding electrified detection circuit in the present embodiment, be connected in series an inductance L between bottom shielding of bushing splicing ear 2 and ground 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 ground capacitance C, and polarity is contrary; Inductance L is arranged in parallel voltage dependent resistor (VDR) R and gas-discharge tube SP, forms end shield protection circuit.
In the present embodiment, deformation of transformer winding electrified detection circuit adopts end shield protection 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 protection 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 protection circuit 5b by insulated copper wire.
Head end outlet casing tube end shield protection circuit 5a and tail end outlet casing tube bottom shielding of bushing protection circuit 5b adopts end shield protection 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 protection 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 protection circuit 5b.
The method utilizing the present embodiment pick-up unit 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 protection circuit 5a and tail end outlet casing tube bottom shielding of bushing protection 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 protection circuit 5b equivalence ground connection by head end outlet casing tube end shield protection 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 protection circuit 5a, after high frequency test signals is coupled by head end outlet casing tube end shield protection 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 protection 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 protection 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 protection circuit and ground capacitance C form Hi-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 Hi-pass filter.Meanwhile, for the normal 220kV transformer run, sleeve pipe main capacitance is generally 400pF, and 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 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 protection circuit and need between end shield ground capacitance C approximate to meet following formula: L=1/ (4 π
2f
2c), f is power frequency 50Hz.Voltage dependent resistor (VDR) R and gas-discharge tube SP is the back-up protection as L-C Hi-pass filter, is used for transient suppression superpotential.
The voltage dependent resistor (VDR) model that protection circuit is selected is 20D221K, and its parameter is as shown in table 1:
The related coefficient of table 120D221K
The gas-discharge tube model selected is 2RM230L-8, and its parameter is as shown in table 2:
The related coefficient of table 22RM230L-8
Claims (1)
1. a deformation of transformer winding electrified detection circuit, it is characterized in that: between bottom shielding of bushing splicing ear (2) and ground 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 ground capacitance C, and polarity is contrary; Described inductance L is arranged in parallel voltage dependent resistor (VDR) R and gas-discharge tube SP; form end shield protection circuit; 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520931897.XU CN205090931U (en) | 2015-11-19 | 2015-11-19 | Transformer winding deformation band electrical detection circuitry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520931897.XU CN205090931U (en) | 2015-11-19 | 2015-11-19 | Transformer winding deformation band electrical detection circuitry |
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| Publication Number | Publication Date |
|---|---|
| CN205090931U true CN205090931U (en) | 2016-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520931897.XU Active CN205090931U (en) | 2015-11-19 | 2015-11-19 | Transformer winding deformation band electrical detection circuitry |
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| Country | Link |
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| CN (1) | CN205090931U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262075A (en) * | 2015-11-19 | 2016-01-20 | 国家电网公司 | End screen protective circuit applied to electrification deformation detection of transformer winding and application thereof |
| CN112510668A (en) * | 2020-11-30 | 2021-03-16 | 国网北京市电力公司 | Protective circuit |
-
2015
- 2015-11-19 CN CN201520931897.XU patent/CN205090931U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262075A (en) * | 2015-11-19 | 2016-01-20 | 国家电网公司 | End screen protective circuit applied to electrification deformation detection of transformer winding and application thereof |
| CN112510668A (en) * | 2020-11-30 | 2021-03-16 | 国网北京市电力公司 | Protective circuit |
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