CN101581751A - Locating method of voltage transformer disconnection - Google Patents
Locating method of voltage transformer disconnection Download PDFInfo
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- CN101581751A CN101581751A CNA2009100861565A CN200910086156A CN101581751A CN 101581751 A CN101581751 A CN 101581751A CN A2009100861565 A CNA2009100861565 A CN A2009100861565A CN 200910086156 A CN200910086156 A CN 200910086156A CN 101581751 A CN101581751 A CN 101581751A
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Abstract
The invention relates to a locating method of voltage transformer disconnection, which is characterized in that: by different combinations of 15 setting values of 7 electric parameters, 14 effective criteria are formed to locate 14 disconnection faults by counting three types of triphase disconnection, diphase disconnection and single-phase disconnection. The 7 electric parameters are respectively: three phase voltages of Ua, Ub and Uc, a zero sequence voltage variation delta U0, a TV negative sequence voltage, a TV secondary winding potential Ea, and a main secondary current IA; the 15 setting values are a1, a2, a3, b1, b2, b3, c1, c2, c3, d1, d2, e, f, g1 and g2. By different combinations of 15 setting values of 7 electric parameters, 14 effective criteria are formed to locate 14 TV disconnection faults. The invention can solve the locating problem of disconnected phases, namely can rapidly and precisely determine the location of a specific disconnected phase, thus reducing accident loss. The invention is suitable for locating bus insulation monitoring voltage transformer disconnection in power equipments such as converting stations.
Description
Technical field
The present invention relates to the localization method of a kind of method that the disconnection fault of power equipment is positioned, particularly voltage transformer (VT) (hereinafter to be referred as TV) broken string.
Background technology
In power equipment, the correct judgement of bus TV disconnection fault is all very necessary to following three kinds of situations:
1. protective device: will cause malfunction if some protection loses the TV normal voltage, therefore when broken string takes place TV, requirement is protected in addition locking with this class;
2. electric energy metrical: when broken string takes place TV, maximum error will appear in electric energy metrical, and the separate difference of TV broken string, and error is different, therefore when TV takes place to break, has only separate the positioning of breaking, and could estimate the error in dipping that is caused by broken string more exactly;
3. repair based on condition of component: fault TV is implemented repair based on condition of component, equally also only under the condition that realizes the broken string location, could improve overhaul efficiency, the shortening inspection and repair shop takes time.
At present, the conventional determination methods of existing TV broken string can and can only be judged broken string, but can not be to concrete separate the positioning of broken string.Therefore, when the broken string accident takes place,, waste time, cause damage owing to can not find the position of broken string fast.
Summary of the invention
The localization method that the purpose of this invention is to provide a kind of voltage transformer disconnection, with solve above-mentioned can not be to the concrete separate problem that positions of broken string.The present invention is the localization method of voltage transformer disconnection, is to realize by following technical scheme, it is characterized in that:
Form 14 kinds of effective criterions by various combination, three-phase broken string, two-phase broken string, 14 kinds of TV disconnection faults of single-phase wire break three class meters are positioned 15 setting valves of 7 electric parameters.7 electric parameters are respectively: three phase voltage U
a, U
b, U
c, residual voltage variation delta 3U
0, TV negative sequence voltage, TV Secondary Winding electromotive force E
a, main secondary current I
A15 setting valves are a
1, a
2, a
3, b
1, b
2, b
3, c
1, c
2, c
3, d
1, d
2, e, f, g
1, g
2
Various combination by to 15 setting valves of 7 electric parameters forms 14 kinds of effective criterions, and three-phase broken string, two-phase broken string, 14 kinds of TV disconnection faults of single-phase wire break three class meters are positioned.
14 kinds of failure criterions comprise:
TV secondary voltage U
a＜a
1, U
b＜b
1, U
c＜c
1, main secondary current I
A＞e, TV Secondary Winding electromotive force E
a＜g
1, be the criterion of TV primary side three-phase broken string;
TV secondary voltage U
a＜a
1, U
b＜b
1, U
c＜c
1, main secondary current I
A＞e, TV Secondary Winding electromotive force E
a＞g
2, be the criterion of TV secondary side three-phase broken string;
TV secondary voltage U
a＜a
2, U
b＜b
2, U
c＞c
3, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＞d
2, be the criterion of TV primary side A, B two-phase broken string;
TV secondary voltage U
a＞a
3, U
b＜b
2, U
c＜c
2, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＞d
2, be the criterion of TV primary side B, C two-phase broken string;
TV secondary voltage U
a＜a
2, U
b＞b
3, U
c＜c
2, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＞d
2, be the criterion of TV primary side C, A two-phase broken string;
TV secondary voltage U
a＜a
2, U
b＜b
2, U
c＞c
3, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＜d
1, be the criterion of TV secondary side a, b two-phase broken string;
TV secondary voltage U
a＞a
3, U
b＜b
2, U
c＜c
2, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＜d
1, be the criterion of TV secondary side b, c two-phase broken string;
TV secondary voltage U
a＜a
2, U
b＞b
3, U
c＜c
2, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＜d
1, be the criterion of TV secondary side c, a two-phase broken string;
TV secondary voltage U
a＜a
2, U
b＞b
3, U
c＞c
3, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＞d
2, the criterion that breaks mutually for TV primary side A;
TV secondary voltage U
a＞a
3, U
b＜b
2, U
c＞c
3, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＞d
2, the criterion that breaks mutually for TV primary side B;
TV secondary voltage U
a＞a
3, U
b＞b
3, U
c＜c
2, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＞d
2, the criterion that breaks mutually for TV primary side C;
TV secondary voltage U
a＜a
2, U
b＞b
3, U
c＞c
3, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＜d
1, the criterion that breaks mutually for TV secondary side a;
TV secondary voltage U
a＞a
3, U
b＜b
2, U
c＞c
3, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＜d
1, the criterion that breaks mutually for TV secondary side b;
TV secondary voltage U
a＞a
3, U
b＞b
3, U
c＜c
2, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＜d
1, the criterion that breaks mutually for TV secondary side c.
15 setting valve a
1, a
2, a
3, b
1, b
2, b
3, c
1, c
2, c
3, d
1, d
2, e, f, g
1, g
2Be respectively successively: 1V, 40V, 45V, 1V, 40V, 45V, 1V, 40V, 45V, 5V, 25V, 0.2A, 18V, 1V, 45V.
The inventive method can judge that the TV broken string occurs in primary side or secondary side; Be single-phase (broken string is in A or B or C phase), two-phase (A, B or B, C or C, A phase), or three-phase (A, B, C phase).Be described as follows:
1, three-phase broken string
The common feature of primary side three-phase broken string and secondary side three-phase broken string is: TV secondary side three-phase voltage is zero or is bordering on zero, but need to be distinguished with system blackout, distinguish TV three-phase broken string and system blackout by detecting having or not of main secondary current, as main secondary electric current is arranged, then belong to TV three-phase broken string; Otherwise main secondary current disappears, and then belongs to system blackout.And then have the detection of potential-free to distinguish secondary side three-phase broken string or primary side three-phase broken string by the TV Secondary Winding, and as the TV Secondary Winding electromotive force is arranged, then belong to TV secondary side three-phase broken string; Otherwise, then belong to TV primary side three-phase broken string.
2, two-phase broken string:
The common feature of primary side two-phase broken string and secondary side two-phase broken string is: in the TV measurement result, and two fault phase voltage rapid drawdowns, one perfects phase voltage remains unchanged, and all negative sequence component occurs.By contrast to the measurement result of TV open delta winding residual voltage variable quantity, distinguish primary side two-phase broken string or secondary side two-phase broken string, when the residual voltage variable quantity is arranged primary side two-phase broken string; Otherwise, be secondary side two-phase broken string when not having the residual voltage variable quantity.Voltage dip is the fault phase mutually, and voltage remains unchanged mutually for perfecting phase.
3, single-phase wire break:
The common feature of primary side single-phase wire break and secondary side single-phase wire break is: in the TV measurement result, and a fault phase voltage rapid drawdown, two perfect phase voltage remains unchanged, and all negative sequence component occurs.By contrast, distinguish primary side single-phase wire break or secondary side single-phase wire break to the measurement result of TV open delta winding residual voltage variable quantity.It when the residual voltage variable quantity is arranged the primary side single-phase wire break; Otherwise, be the secondary side single-phase wire break when not having the residual voltage variable quantity.Voltage dip is the fault phase mutually, and voltage remains unchanged mutually for perfecting phase.
In sum, the present invention can solve above-mentioned to the separate problem that can not locate that breaks, and the present invention can make fast, accurately judge the particular location of broken string, the minimizing causality loss.The present invention is applicable to the location of power equipment such as transformer station's median generatrix insulating monitoring voltage transformer disconnection.
Description of drawings
Fig. 1 is a theory diagram of the present invention.
Code name among the figure:
U
a, U
b, U
cBe TV secondary side phase voltage measured value,
Δ 3U
0For TV opens the measured value of triangle voltage variety,
I
ABe main transformer secondary A current phasor measurement value,
The TV negative phase-sequence is the secondary side negative sequence voltage measured value of TV,
E
aBe TV secondary side a phase winding potential measurement value,
a
1, a
2, a
3, b
1, b
2, b
3, c
1, c
2, c
3, d
1, d
2, e, f, g
1, g
2Be setting parameter, be respectively 1V, 40V, 45V, 1V, 40V, 45V, 1V, 40V, 45V, 5V, 25V, 0.2A, 18V, 1V, 45V
Embodiment
With reference to Fig. 1, orientate example as with 10～35 (66) kV bus insulations monitoring TV broken string in the transformer station, the inventive method is illustrated.
The deterministic process of embodiment 1, primary side three-phase broken string:
When detecting secondary voltage U
a=0.1V, U
b=0V, U
c=0.05V, main secondary current I
A=2.5A, E
aDuring=0.1V, be judged to TV primary side three-phase broken string.
The deterministic process of embodiment 2, secondary side three-phase broken string:
When detecting secondary voltage U
a=0.1V, U
b=0V, U
c=0.05V, main secondary current I
A=2.5A, E
aDuring=57.8V, be judged to TV secondary side three-phase broken string.
The deterministic process of embodiment 3, primary side two-phase, for example A, B two-phase broken string:
When detecting secondary voltage U
a=14V, U
b=12.5V, U
c=57.5V, TV negative phase-sequence=20V, Δ 3U
0During=33V, be judged to TV primary side A, B two-phase broken string.
The deterministic process of embodiment 4, secondary side two-phase, for example a, b two-phase broken string:
When detecting secondary voltage U
a=23V, U
b=22.5V, U
c=57.5V, TV negative phase-sequence=20V, Δ 3U
0During=3V, be judged to TV secondary side a, b two-phase broken string.
Embodiment 5, the deterministic process that primary side is single-phase, for example B breaks mutually:
When detecting secondary voltage U
a=57.2V, U
b=13V, U
c=57.5V, TV negative phase-sequence=20V, Δ 3U
0During=33V, be judged to TV primary side B and break mutually.
Embodiment 6, the deterministic process that secondary side is single-phase, for example c breaks mutually:
When detecting secondary voltage U
a=57.6V, U
b=57.8V, U
c=23.5V, TV negative phase-sequence=20V, Δ 3U
0During=2.8V, be judged to TV secondary side c and break mutually.
Claims (3)
1, the localization method of voltage transformer disconnection is characterized in that, forms 14 kinds of failure criterions by the various combination to 15 setting valves of 7 electric parameters, and three-phase broken string, two-phase broken string, 14 kinds of TV disconnection faults of single-phase wire break three class meters are positioned;
7 electric parameters are respectively: three phase voltage U
a, U
b, U
c, residual voltage variation delta 3U
0, TV negative sequence voltage, TV Secondary Winding electromotive force E
a, main secondary current I
A
15 setting valves are a
1, a
2, a
3, b
1, b
2, b
3, c
1, c
2, c
3, d
1, d
2, e, f, g
1, g
2
According to the localization method of right 1 described voltage transformer disconnection, it is characterized in that 2,14 kinds of failure criterions are meant:
TV secondary voltage U
a＜a
1, U
b＜b
1, U
c＜c
1, main secondary current I
A＞e, TV Secondary Winding electromotive force E
a＜g
1, be the criterion of TV primary side three-phase broken string;
TV secondary voltage U
a＜a
1, U
b＜b
1, U
c＜c
1, main secondary current I
A＞e, TV Secondary Winding electromotive force E
a＞g
2, be the criterion of TV secondary side three-phase broken string;
TV secondary voltage U
a＜a
2, U
b＜b
2, U
c＞c
3, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＞d
2, be the criterion of TV primary side A, B two-phase broken string;
TV secondary voltage U
a＞a
3, U
b＜b
2, U
c＜c
2, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＞d
2, be the criterion of TV primary side B, C two-phase broken string;
TV secondary voltage U
a＜a
2, U
b＞b
3, U
c＜c
2, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＞d
2, be the criterion of TV primary side C, A two-phase broken string;
TV secondary voltage U
a＜a
2, U
b＜b
2, U
c＞c
3, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＜d
1, be the criterion of TV secondary side a, b two-phase broken string;
TV secondary voltage U
a＞a
3, U
b＜b
2, U
c＜c
2, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＜d
1, be the criterion of TV secondary side b, c two-phase broken string;
TV secondary voltage U
a＜a
2, U
b＞b
3, U
c＜c
2, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＜d
1, be the criterion of TV secondary side c, a two-phase broken string;
TV secondary voltage U
a＜a
2, U
b＞b
3, U
c＞c
3, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＞d
2, the criterion that breaks mutually for TV primary side A;
TV secondary voltage U
a＞a
3, U
b＜b
2, U
c＞c
3, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＞d
2, the criterion that breaks mutually for TV primary side B;
TV secondary voltage U
a＞a
3, U
b＞b
3, U
c＜c
2, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＞d
2, the criterion that breaks mutually for TV primary side C;
TV secondary voltage U
a＜a
2, U
b＞b
3, U
c＞c
3, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＜d
1, the criterion that breaks mutually for TV secondary side a;
TV secondary voltage U
a＞a
3, U
b＜b
2, U
c＞c
3, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＜d
1, the criterion that breaks mutually for TV secondary side b;
TV secondary voltage U
a＞a
3, U
b＞b
3, U
c＜c
2, TV negative sequence voltage＞f, residual voltage variation delta 3U
0＜d
1, the criterion that breaks mutually for TV secondary side c.
3,, it is characterized in that 15 setting valve a according to the localization method of right 1 described voltage transformer disconnection
1, a
2, a
3, b
1, b
2, b
3, c
1, c
2, c
3, d
1, d
2, e, f, g
1, g
2Be respectively: 1V, 40V, 45V, 1V, 40V, 45V, 1V, 40V, 45V, 5V, 25V, 0.2A, 18V, 1V, 45V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100861565A CN101581751B (en) | 2009-06-11 | 2009-06-11 | Locating method of voltage transformer disconnection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100861565A CN101581751B (en) | 2009-06-11 | 2009-06-11 | Locating method of voltage transformer disconnection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101581751A true CN101581751A (en) | 2009-11-18 |
| CN101581751B CN101581751B (en) | 2012-07-18 |
Family
ID=41363988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100861565A Expired - Fee Related CN101581751B (en) | 2009-06-11 | 2009-06-11 | Locating method of voltage transformer disconnection |
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| Country | Link |
|---|---|
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890222A (en) * | 2012-10-17 | 2013-01-23 | 南京国电南自美卓控制系统有限公司 | Method for judging breaking of PT (potential transformer) in fast switch |
| CN104297625A (en) * | 2014-11-07 | 2015-01-21 | 安徽马钢自动化信息技术有限公司 | PT wire breakage diagnosis system and method |
| CN104836330A (en) * | 2015-04-16 | 2015-08-12 | 广东电网有限责任公司揭阳供电局 | Method for quickly detecting bus PT three-phase disconnection of automatic switching device of standby power supply and method for preventing maloperation of bus PT three-phase disconnection of automatic switching device of standby power supply |
| CN106291219A (en) * | 2016-10-10 | 2017-01-04 | 国网四川省电力公司技能培训中心 | Single-phase earthing/PT disconnection fault automatic discrimination alarm device and method |
| CN109375028A (en) * | 2018-08-27 | 2019-02-22 | 许继集团有限公司 | A kind of broken string recognition methods of high voltage power cable circulating current sensor and device |
| CN112345977A (en) * | 2020-10-21 | 2021-02-09 | 河南华润电力首阳山有限公司 | Electrical equipment and PT secondary circuit disconnection judgment method, system and device thereof |
| CN113341274A (en) * | 2021-06-10 | 2021-09-03 | 国网江苏省电力有限公司南通供电分公司 | PT power taking configuration method for power distribution overhead line disconnection fault diagnosis |
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Cited By (9)
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| CN102890222A (en) * | 2012-10-17 | 2013-01-23 | 南京国电南自美卓控制系统有限公司 | Method for judging breaking of PT (potential transformer) in fast switch |
| CN104297625A (en) * | 2014-11-07 | 2015-01-21 | 安徽马钢自动化信息技术有限公司 | PT wire breakage diagnosis system and method |
| CN104836330A (en) * | 2015-04-16 | 2015-08-12 | 广东电网有限责任公司揭阳供电局 | Method for quickly detecting bus PT three-phase disconnection of automatic switching device of standby power supply and method for preventing maloperation of bus PT three-phase disconnection of automatic switching device of standby power supply |
| CN106291219A (en) * | 2016-10-10 | 2017-01-04 | 国网四川省电力公司技能培训中心 | Single-phase earthing/PT disconnection fault automatic discrimination alarm device and method |
| CN106291219B (en) * | 2016-10-10 | 2023-05-05 | 国网四川省电力公司技能培训中心 | Single-phase grounding/PT wire breakage fault automatic judging and alarming device and method |
| CN109375028A (en) * | 2018-08-27 | 2019-02-22 | 许继集团有限公司 | A kind of broken string recognition methods of high voltage power cable circulating current sensor and device |
| CN112345977A (en) * | 2020-10-21 | 2021-02-09 | 河南华润电力首阳山有限公司 | Electrical equipment and PT secondary circuit disconnection judgment method, system and device thereof |
| CN112345977B (en) * | 2020-10-21 | 2023-11-24 | 河南华润电力首阳山有限公司 | Electrical equipment and PT secondary circuit disconnection judging method, system and device thereof |
| CN113341274A (en) * | 2021-06-10 | 2021-09-03 | 国网江苏省电力有限公司南通供电分公司 | PT power taking configuration method for power distribution overhead line disconnection fault diagnosis |
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