CN103941212A - Method for capacitor voltage transformer polarity on-site calibration - Google Patents
Method for capacitor voltage transformer polarity on-site calibration Download PDFInfo
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- CN103941212A CN103941212A CN201410115864.8A CN201410115864A CN103941212A CN 103941212 A CN103941212 A CN 103941212A CN 201410115864 A CN201410115864 A CN 201410115864A CN 103941212 A CN103941212 A CN 103941212A
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Abstract
The invention relates to the technical field of high voltage electric power equipment detection, in particular to a method for capacitor voltage transformer polarity on-site calibration. The method comprises the steps that a direct-current power source is replaced with a tramegger, and the polarity of a capacitor voltage transformer is judged through tools such as the tramegger, a pointer multimeter and an insulation pull rod, wherein the tramegger, the pointer multimeter and the insulation pull rod are commonly used on the maintenance test site, and the capacitor voltage transformer is connected with the tramegger and the pointer multimeter. According to the method for capacitor voltage transformer polarity on-site calibration, the direct-current power source is replaced with the tramegger, on the basis that no additional cost is increased, existing test equipment is sufficiently utilized, damage caused by the instable direct-current power source to the equipment is eliminated, the problem that the test schedule is affected by insufficient electric quantity of the direct-current power source is avoided, better service is provided for on-site production, working efficiency is improved, the test time and cost are reduced, the secondary polarity of the capacitor voltage transformer can be accurately, conveniently and rapidly judged on the substation site, and safe and stable running of the substation is ensured.
Description
Technical field
The present invention relates to high voltage electric power equip ment detection technique field, particularly relate to a kind of method of capacitance type potential transformer polarity field-checking.
Background technology
Capacitance type potential transformer is to develop on the basis of capacitance graded bushing capacitor-voltage detecting device, realize voltage transformation by principle of capacitive divider, have good insulation preformance, withstand voltage level high, be difficult for low with breaker fracture electric capacity generation resonance, production cost, can double as the plurality of advantages such as high-frequency communication, be widely used in 110kV and above power transmission and transformation system.Main Function is the voltage signal sampler as voltage measurement and relay protection, plays the voltage and current effect that plays isolation first and second loop in relay protection secondary circuit, and its secondary voltage signal is the important criterion of electric power system fault.It should be noted that mutual inductor has two and above leading-out terminal in first and second side; leading-out terminal polarity wrong can make the phase place of secondary side change 180 °; both affected protective relaying device correct operation; affect again operation monitoring and the accident treatment of electric system, when serious, go back entail dangers to equipment and personal safety.Therefore the polarity that, correctly judges voltage transformer (VT) summation current transformer is a very important job.
At present, the method for the conventional field-checking to capacitance type potential transformer is DC-method, and the method need to be using dry cell as pressurizing member.Detect polarity chron, the positive pole of battery and switch series are connected on to one end of primary winding, and the positive terminal of moving-coil instrument are connected on the Same Name of Ends of secondary coil, be partial to and judge polarity by closes a floodgate moment pointer of switch.The method need be prepared direct supply and switch, and operation is comparatively complicated, and direct supply electric weight is had relatively high expectations, and easily causes device damage.
Summary of the invention
For overcoming prior art defect; the invention provides a kind of method of capacitance type potential transformer polarity field-checking; object is to ensure under capacitance partial pressure unit and the intact prerequisite of electromagnetic unit; accurate, convenient at substation field, judge capacitance type potential transformer secondary polarity fast, avoid wiring error and relay protection fault.
For achieving the above object, the technical solution adopted in the present invention is:
A method for capacitance type potential transformer polarity field-checking, comprising: substitute direct supply with megohmmeter, utilize the on-the-spot conventional Work tool megohmmeter of checking experiment, pointer multimeter, insulated tension pole to realize the polarity judgement to capacitance type potential transformer; Wherein: capacitance type potential transformer is concatenation pointer formula multimeter and megohmmeter respectively;
Method step is as follows:
Utilize insulated tension pole that the E end points of megohmmeter is hit to capacitance type potential transformer center flange P point, observe pointer multimeter pointer and be partial to judge capacitance type potential transformer polarity;
If pointer multimeter pointer just refers to, is same polarity, otherwise it is reversed polarity.
Described method step is as follows:
(1) open the terminal box of capacitance type potential transformer, disconnect A mutually the first main Secondary Winding 1a 1n, the second main Secondary Winding 2a 2n, residue winding da the external connecting line of dn tri-spiral circle, same disconnect B mutually the first main Secondary Winding 1a 1n, the second main Secondary Winding 2a 2n, residue winding da the external connecting line of dn tri-spiral circle, disconnect C mutually the first main Secondary Winding 1a 1n, the second main Secondary Winding 2a 2n, residue winding da the external connecting line of dn tri-spiral circle;
(2) pointer multimeter gear is switched to less milliampere or millvolt range;
(3) pointer multimeter positive pole (+) is connected to 1a, negative pole (-) is connected to 1n;
(4) by megohmmeter circuit L end ground connection, earth terminal E is connected to insulated tension pole top;
(5) it is ready that the hand-held insulated tension pole of test people is aimed at capacitance type potential transformer center flange P point, and another test people shakes megohmmeter, and to be charged when sufficient, the hand-held insulated tension pole aligning of test people capacitance type potential transformer center flange P point is clicked;
(6) observe pointer multimeter personnel and observe, pointer multimeter pointer is just referring to same polarity, otherwise is reversed polarity.
Advantage of the present invention and effect are:
Can see from the embodiment of the present invention, by substituting direct supply with megohmmeter, can not increase on the basis of extra cost, make full use of existing testing equipment, eliminate the unstable harm that equipment is caused of direct supply, avoid due to the not enough problem that affects test progress of direct supply electric weight, can better serve produced on-site, improve work efficiency, time and the cost of test are reduced, realize accurate, convenient at substation field, judge capacitance type potential transformer secondary polarity fast, ensure substation safety stable operation.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
Fig. 1 is capacitance type potential transformer key wiring diagram;
Fig. 2 is wiring schematic diagram of the present invention.
In figure: high-voltage capacitance C
1, high-voltage capacitance C
2, intermediate transformer T, compensation reactor L, damper ZD, protective device F; the first main Secondary Winding 1a 1n, the second main Secondary Winding 2a 2n, residue winding da dn, carrier equipment NX; capacitance type potential transformer 1, pointer multimeter 2, megohmmeter 3, insulated tension pole 4.
Embodiment
The method is by substituting direct supply with megohmmeter, when after megohmmeter full charge, utilizing insulated tension pole that megohmmeter E end points is hit to voltage transformer (VT) center flange, observes multimeter pointer deflection and judges capacitance type potential transformer polarity.
The present invention is a kind of method of capacitance type potential transformer polarity field-checking, by substituting direct supply with megohmmeter, when after megohmmeter full charge, utilize the conventional Work tool megohmmeter 3 of test Overhaul site, pointer multimeter 2, insulated tension pole 4 to realize the polarity judgement to capacitance type potential transformer 1; Wherein: capacitance type potential transformer 1 concatenation pointer formula multimeter 2 and megohmmeter 3 respectively.Utilize insulated tension pole 4 that the E end points of megohmmeter 3 is hit to capacitance type potential transformer 1 center flange P point, observe pointer multimeter 2 pointers and be partial to judge capacitance type potential transformer polarity, if pointer multimeter 2 pointers are just referring to for same polarity, otherwise are being reversed polarity.。
As shown in Figure 1 and Figure 2, be judged as example with certain 220kV capacitance type potential transformer polarity, testing ground utilize the conventional Work tool of test maintenance possess ma the megohmmeter, the wire using while measuring of mv range pointer multimeter, insulated tension pole, 2500M Ω range, concrete steps are as follows:
1) open the terminal box of place capacitance type potential transformer 1, disconnect A mutually the first main Secondary Winding 1a 1n, the second main Secondary Winding 2a 2n, residue winding da the external connecting line of dn tri-spiral circle, same disconnect B mutually the first main Secondary Winding 1a 1n, the second main Secondary Winding 2a 2n, residue winding da the external connecting line of dn tri-spiral circle, disconnect C mutually the first main Secondary Winding 1a 1n, the second main Secondary Winding 2a 2n, residue winding da the external connecting line of dn tri-spiral circle.
2) pointer multimeter 2 gears are switched to less milliampere or millvolt range.
3) pointer multimeter 2 positive poles (+) are connected to 1a, negative pole (-) is connected to 1n.
4) by megohmmeter 3 circuit L end ground connection, earth terminal E is connected to insulated tension pole 4 tops.
5) to aim at capacitance type potential transformer 1 center flange P point ready for test people hand-held insulated tension pole 4, and another test people shakes megohmmeter 3, to be charged when sufficient, tests the hand-held insulated tension pole 4 of people and aim at capacitance type potential transformer 1 center flange P point and click.
6) observe pointer multimeter 2 personnel and observe, pointer multimeter 2 pointers are just referring to same polarity, otherwise are reversed polarity.
Above-mentioned embodiment is the preferred embodiments of the present invention; can not limit the present invention; can determine concrete embodiment according to technical scheme of the present invention and actual conditions; other any change or other equivalent substitute mode of making for deviating from technical scheme of the present invention, within being included in protection scope of the present invention.
Claims (2)
1. a method for capacitance type potential transformer polarity field-checking, is characterized in that:
Comprise: substitute direct supply with megohmmeter, utilize the on-the-spot conventional Work tool megohmmeter (3) of checking experiment, pointer multimeter (2), insulated tension pole (4) to realize the polarity judgement to capacitance type potential transformer (1); Wherein: capacitance type potential transformer (1) is concatenation pointer formula multimeter (2) and megohmmeter (3) respectively;
Method step is as follows:
Utilize insulated tension pole (4) that the E end points of megohmmeter (3) is hit to capacitance type potential transformer (1) center flange P point, observe pointer multimeter (2) pointer and be partial to judge capacitance type potential transformer polarity;
If pointer multimeter (2) pointer just refers to, is same polarity, otherwise is reversed polarity.
2. the method for a kind of capacitance type potential transformer polarity field-checking according to claim 1, is characterized in that: described method step is as follows:
(1) open the terminal box of capacitance type potential transformer (1), disconnect A mutually the first main Secondary Winding 1a 1n, the second main Secondary Winding 2a 2n, residue winding da the external connecting line of dn tri-spiral circle, same disconnect B mutually the first main Secondary Winding 1a 1n, the second main Secondary Winding 2a 2n, residue winding da the external connecting line of dn tri-spiral circle, disconnect C mutually the first main Secondary Winding 1a 1n, the second main Secondary Winding 2a 2n, residue winding da the external connecting line of dn tri-spiral circle;
(2) pointer multimeter (2) gear is switched to less milliampere or millvolt range;
(3) pointer multimeter (2) anodal (+) is connected to 1a, negative pole (-) is connected to 1n;
(4) by megohmmeter (3) circuit L end ground connection, earth terminal E is connected to insulated tension pole (4) top;
(5) it is ready that the test hand-held insulated tension pole of people (4) is aimed at capacitance type potential transformer (1) center flange P point, another test people shakes megohmmeter (3), to be charged when sufficient, the test hand-held insulated tension pole of people (4) is aimed at capacitance type potential transformer (1) center flange P point and is clicked;
(6) observe pointer multimeter (2) personnel and observe, pointer multimeter (2) pointer is just referring to same polarity, otherwise is reversed polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410115864.8A CN103941212A (en) | 2014-03-26 | 2014-03-26 | Method for capacitor voltage transformer polarity on-site calibration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410115864.8A CN103941212A (en) | 2014-03-26 | 2014-03-26 | Method for capacitor voltage transformer polarity on-site calibration |
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| CN103941212A true CN103941212A (en) | 2014-07-23 |
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| CN201410115864.8A Pending CN103941212A (en) | 2014-03-26 | 2014-03-26 | Method for capacitor voltage transformer polarity on-site calibration |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606951A (en) * | 2015-11-27 | 2016-05-25 | 云南电网有限责任公司电力科学研究院 | Method and device for measuring polarity of capacitor voltage transformer by using self-excitation method |
| CN111292926A (en) * | 2020-03-04 | 2020-06-16 | 山东泰开互感器有限公司 | 10kV pouring type capacitive voltage transformer with self-healing protection function and installation method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101769980A (en) * | 2008-12-31 | 2010-07-07 | 新疆维吾尔自治区送变电工程公司 | Testing method simulating power transmission debugging |
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2014
- 2014-03-26 CN CN201410115864.8A patent/CN103941212A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769980A (en) * | 2008-12-31 | 2010-07-07 | 新疆维吾尔自治区送变电工程公司 | Testing method simulating power transmission debugging |
Non-Patent Citations (2)
| Title |
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| 汪军: "电容式电压互感器的极性测试方法", 《电世界》 * |
| 郭再福 等: "电容式电压互感器极性校验方法改进", 《农村电气化》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606951A (en) * | 2015-11-27 | 2016-05-25 | 云南电网有限责任公司电力科学研究院 | Method and device for measuring polarity of capacitor voltage transformer by using self-excitation method |
| CN111292926A (en) * | 2020-03-04 | 2020-06-16 | 山东泰开互感器有限公司 | 10kV pouring type capacitive voltage transformer with self-healing protection function and installation method |
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Application publication date: 20140723 |