CN106990380B - Fault detection method for on-site capacitor voltage transformer - Google Patents
Fault detection method for on-site capacitor voltage transformer Download PDFInfo
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- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses an field capacitor voltage transformer fault detection method, which belongs to the field of power systems and solves the technical problem that the fault of a capacitor voltage transformer cannot be conveniently, timely and quickly judged in the prior art.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a fault detection method for field capacitor voltage transformers.
Background
The capacitor voltage transformer is used as voltage transformers for meter and relay protection, and can couple carrier frequency to power transmission line for long distance communication, remote measurement, selective high frequency line protection, remote control, etc. compared with conventional electromagnetic voltage transformer, the capacitor voltage transformer can prevent ferromagnetic resonance caused by saturation of iron core of the voltage transformer and has great superiority in economy and safety.
The capacitor voltage transformer is applied to power systems with voltage grades of mm, 110k V and above in high-voltage transmission, the CVT is the voltage transformer mainly used, in systems with ultra-high voltage grades and ultra-high voltage grades, the utilization rate of the CVT almost reaches 100%, times of voltage information in a high-voltage power grid is mainly converted by the CVT and then transmitted to the metering and relay protection device, and therefore the good state of the CVT has important significance for the metering device to accurately meter and the relay protection device to obtain correct signals so as to guarantee reliable action, avoid accidents and ensure safety and stability of the power grid.
The capacitor voltage transformer mainly comprises a capacitor unit and an electromagnetic unit, wherein the capacitor unit is divided into a main capacitor and a voltage division capacitor, and the main capacitor and the voltage division capacitor are respectively formed by connecting a plurality of capacitor elements in series. The electromagnetic unit is mainly composed of an intermediate transformer, a compensation reactor, a damper and the like, and is usually installed in a sealed oil tank for an oil immersed type CVT.
The capacitor unit reduces times of voltage of the system through capacitor voltage division, the voltage is used as the input of an intermediate transformer, and the voltage is reduced, and the device is used for power supply metering, relay protection and the like.
With the great application of the CVT in the power system, due to the limitation of design and manufacturing experience, process level, raw materials, overvoltage and other factors, the power grid fault caused by the CVT is 2 times that of the electromagnetic voltage transformer, and denier CVT has faults, which will cause accidents such as power metering error and protection device malfunction, seriously affect the accuracy and reliability of power metering and the safety of the power grid, and in serious cases, explosion and fire will be caused, which causes the power transmission line to stop supplying power, even large area power cut.
At present, the on-site capacitor voltage transformer is composed of a main capacitor C1And a voltage-dividing capacitor C2And after being connected in series, the power is grounded. Secondary voltage from C2The voltage dividing capacitor voltage dividing element extracts voltage and obtains the voltage through the electromagnetic unit.
When the capacitor voltage transformer fails, the secondary voltage of the capacitor voltage transformer is displayed abnormally, a maintainer needs to ascend to remove a high-voltage lead, the tester tests the capacitor voltage transformer and judges and searches a fault element according to test data, the operation of ascending to remove the high-voltage lead is very dangerous and troublesome, time and energy are consumed, and the fault capacitor voltage transformer is influenced by induction electricity of surrounding electrified equipment, so that difficulty is often brought to the judgment of the condition of the fault electromagnetic voltage transformer, and the detection result is unreliable.
documents for detecting capacitive voltage transformers are disclosed in the prior art.
The non-patent literature ("infrared monitoring diagnosis capacitor voltage transformer fault analysis", who Dong et al, high voltage technology, vol.34, No. 6) discloses infrared monitoring diagnosis capacitor voltage transformer fault analyses, and the infrared diagnosis technology is adopted to analyze the abnormal heating accidents of 2-start CVT oil tanks.
The above documents adopt infrared rays for detection, which is not universal in practical application, and infrared ray detection requires professional equipment of , and when an instrument fails, it is more complicated to obtain images by using infrared rays, and the purposes of timeliness, convenience and quickness cannot be achieved.
Non-patent literature ("capacitive voltage transformer electromagnetic unit fault verification method", zhangdong et al, power science and engineering, vol 31, No. 9) discloses a capacitive voltage transformer electromagnetic unit fault verification method, wherein , whether a secondary winding is damaged or not is verified by measuring whether insulation resistance and direct current resistance meet regulations or not, if abnormal, the secondary winding fails, if normal, the step is carried out at , and secondly, the state of a damper is checked, da to dn are short-circuited, d1 to d2 connecting sheets are opened, meanwhile, an N-X connecting sheet is also required to be opened, so that an intermediate transformer runs in a no-load mode during a high-voltage test, an independent damping loop capable of testing two ports is formed, then, a power frequency voltage with an effective value of 100V is applied to two ports d1 to d2 of the damper, the damping current of the damper is tested, and finally, the damping current is verified according to a test result, if the damping current is 0, the damping current is proved to be an open circuit, the damping current is possibly burnt out, and is not more than 1A, the damping circuit is normal, otherwise, and the damping capacitor is judged to be.
The verification method needs multiple operations, needs voltage application, short circuit and damping current test, is troublesome and tedious, has low operability, limits practical application, and cannot meet the requirements of timeliness, rapidness and convenience.
Disclosure of Invention
In order to solve the problems that the faults of the capacitor voltage transformer and the specific positions of the faults cannot be judged quickly, correctly and timely in the prior art, the invention discloses a fault detection method for the on-site capacitor voltage transformer.
A method for detecting faults of a capacitor voltage transformer comprises the following steps:
step 1, selecting A, B, C any phases aiming at a failed capacitor voltage transformer, and opening a grounding point E of an electromagnetic unit and a tail end delta of a voltage division capacitor C2;
step 2, 220V alternating voltage is added to delta-to-ground, and delta voltage Uc of tail end E of the electromagnetic unit is measured2And measuring the voltage Uc of the tail end E of the electromagnetic unit to the ground1Calculating KU12＝Uc1/Uc2(ii) a KA, KB, K are obtained by this methodC；
Step 3, grounding the tail end E of the electromagnetic unit, and pressurizing at delta; measuring voltages 1a1n, 2a2n, 3a3n and dadn of the three-phase capacitive voltage transformer respectively;
and 4, judging:
(1) capacitive cell determination
Comparison of KA, KB, KCThree-phase value, when the difference is not large, it indicates that the capacitor unit C1、C2No problem exists; when the difference is large, the capacitor units with similar ratios have no fault.
(2) Electromagnetic unit judgment
The voltages of A, B, C three phases of corresponding secondary windings 1a1n, 2a2n, 3a3n and dadn are respectively observed, if the difference between the three phases is not large, the electromagnetic unit part of the three phases is not in fault, and if the difference between certain corresponding secondary windings in the three phases is large, the phase is in fault.
The invention has the beneficial effects that:
in the long-term work of a power system, the invention applies the working principle of the capacitive voltage transformer, in order to overcome the technical problems of time and labor waste and dangerous operation of the conventional method, sets of simple and convenient methods for judging the fault of the capacitive voltage transformer without overhead operation and lead removal are searched, the problems existing in the prior art which cannot be solved by the conventional detection technical method can be solved, the method can conveniently, timely and quickly judge the fault position of the capacitive voltage transformer, the voltage of the capacitive voltage transformer only needs to be measured, the voltage of the fault phase is obviously changed compared with the value of the normal phase through the comparison of the voltages of the corresponding parts between the normal phase and the fault phase, the method can distinguish whether the fault unit exists in the capacitor or the electromagnetic unit, namely, the comprehensive detection and analysis can be met, if the fault exists, whether the other parts have faults or not can be selected, the selectivity is large, the comparison is carried out through the conventional method in the field, the accuracy of the invention is obtained, but the invention is easy to adopt simple and easy to operate, the technical problems existing in the conventional method are solved, the technical problem of simple and labor-saving, the technical method is easy to obtain the field test data, the simple and the practical data of the capacitive voltage transformer, the simple and the technical method is easy to provide the simple and the practical data for the simple and the research .
Drawings
Fig. 1 is a schematic diagram of detection wiring of a capacitor voltage transformer.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention, however, it will be apparent to those skilled in the art that the present invention may be practiced without or more of these details.
Example 1
14 days 12 and 14 months 2016, a 220KVXX transformer substation and a 110KV south mother capacitor voltage transformer (TYD110/√ 3-0.01H, 10 months 1999 leave the factory) are subjected to voltage abnormity inspection.
Referring to fig. 1, in step 1, for a failed capacitor voltage transformer, selecting A, B, C any phase, and opening an electromagnetic unit grounding point E and a tail end δ of a voltage division capacitor C2;
step 2, adding 220V alternating voltage to delta-earth, measuring delta voltage Uc2 at the tail end E of the electromagnetic unit and voltage Uc1 at the tail end E of the electromagnetic unit, and calculating KU12 as Uc1/Uc 2; KA, KB, KC are obtained by the method;
step 3, selecting A, B, C arbitrary phase, grounding the tail end E of the electromagnetic unit, and pressurizing at delta, respectively measuring the voltages of 1a1n, 2a2n, 3a3n and dadn of the three-phase capacitance type voltage transformer;
and 4, judging:
the measured values and the determinations are shown in the following tables and II
TABLE
As can be seen from the above table, the C phase ratio K is obviously greater than that of the other two phases, and the C phase capacity is judged to have a problem; as seen from the table, the main capacitance of the C phase becomes significantly smaller and needs to be replaced. The measured values of the capacitors in the table are measured by using a test instrument after the high-voltage lead is removed. From the voltage ratio, the capacitance value and the capacitance ratio, the accuracy of judging the capacitance voltage transformer by the method is proved, and compared with the traditional measuring method, the method is more convenient and strong in operability, and the problems in the prior art are solved.
Watch two
The same voltage is added to the same position delta of the three phases, and the secondary measurement voltage is basically , which indicates that no fault exists in the electromagnetic unit part.
Example 2
7/2016, and 110KVXX transformer substation, and 110KV east mother capacitor voltage transformer (TYD110/√ 3-0.01H, leaving the factory in 1998 02) were checked for voltage anomalies.
The measured values and the determinations are shown in the following Table three and Table four
Watch III
As can be seen from the above table, the three-phase ratio is not very different, and the capacitance is normal. The measured capacitance value is measured by a test instrument after the high-voltage lead is removed. From the voltage ratio, the capacitance value and the capacitance ratio, the method is used for accurately judging the abnormality of the capacitor.
Watch four
The difference of three-phase values is obvious, the turn-to-turn short circuit exists between turns of the B-phase electromagnetic unit, the same voltage is added to the same position delta of the three phases after the electromagnetic unit is grounded, the secondary measurement voltage is basically , and the B-phase voltage is obviously increased, so that the fault of the B-phase electromagnetic unit is shown.
Example 3
11 days 3 and 3 months in 2013, a 220KVXX transformer substation and a 220KV south mother capacitor voltage transformer (TYD220/√ 3-0.005H, factory 08 months 1999) are subjected to voltage abnormity inspection.
The measured values and the judgment are shown in the following table five and table six
Watch five
From the above table, the three-phase ratio is basically , there is no problem in capacitance, the measured value of the capacitor is the data measured by the test instrument after the high voltage lead is removed, and the method is used to determine the abnormality and accuracy of the capacitor in terms of the voltage ratio, the capacitance value and the capacitance ratio.
Watch six
The difference of the three-phase ratios is large, the C-phase electromagnetic unit is abnormal, times of short-circuit faults exist, after the electromagnetic unit is grounded, the same voltage is added to the same position delta of the three phases, and the voltage measured for the second time is basically .
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (4)
1, A method for detecting the fault of a capacitor voltage transformer, which is characterized in that,
step 1, measuring a capacitor unit, respectively measuring voltages at two ends of a corresponding main capacitor and a voltage division capacitor for A, B, C three phases, and calculating the ratio of the two voltages;
step 2, judging, comparing corresponding ratios obtained by the three phases, if the ratios are similar, the capacitance unit has no fault, if the phase ratio is not similar to other two phases, the capacitance unit of the phase has fault,
selecting A, B, C any phases aiming at the failed capacitor voltage transformer, and opening the grounding point E of the electromagnetic unit and the tail end delta of the voltage division capacitor C2;
the end of the main capacitor C1 is grounded, 220V alternating voltage is added to delta-ground, the delta voltage Uc2 of the tail end E of the electromagnetic unit is measured, the voltage Uc1 of the tail end E of the electromagnetic unit is measured, and KU12= Uc1/Uc2 is calculated, so that KA, KB and KC are obtained by the method.
2. The method for detecting the faults of the capacitor voltage transformers as claimed in claim 1, further comprising the step 3 of measuring voltages of 1a1n, 2a2n, 3a3n and dadn of the three-phase capacitor voltage transformer for A, B, C three phases respectively by an electromagnetic unit.
3. The method for detecting failures of capacitor voltage transformers according to claim 2, wherein the step 3 is implemented by grounding the tail end E of the electromagnetic unit and applying a voltage at δ, and measuring the voltages 1a1n, 2a2n, 3a3n and dadn of the three-phase capacitor voltage transformers respectively.
4. The method for detecting kinds of faults of the capacitor voltage transformer as claimed in claim 3, further comprising step 4, the electromagnetic unit judges that A, B, C voltages of the three phases corresponding to the secondary windings 1a1n, 2a2n, 3a3n and dadn are respectively observed, if the three phases are similar, it is indicated that no fault exists in the electromagnetic unit part of the three phases, and if the corresponding secondary windings of phases are not similar, it is indicated that the electromagnetic unit of the phase has a fault.
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| CN109116285A (en) * | 2018-08-22 | 2019-01-01 | 国网江苏省电力有限公司盐城供电分公司 | A kind of capacitance type potential transformer measuring device with electricity based on multi-signal acquisition |
| CN110221130A (en) * | 2019-04-22 | 2019-09-10 | 贵州电网有限责任公司 | A kind of capacitance type potential transformer measurement structure and measurement method |
| CN110361686B (en) * | 2019-08-28 | 2021-05-18 | 华北电力大学（保定） | Multi-parameter-based fault detection method for capacitive voltage transformer |
| CN113030831B (en) * | 2021-03-10 | 2024-02-06 | 国网山西省电力公司检修分公司 | Method for quickly searching faults of voltage transformer in running state |
| CN114089018A (en) * | 2021-11-05 | 2022-02-25 | 国网青海省电力公司检修公司 | Method for testing faults of electromagnetic units of capacitor voltage transformer |
| CN114818817B (en) * | 2022-05-06 | 2023-05-19 | 国网四川省电力公司电力科学研究院 | Weak fault identification system and method for capacitive voltage transformer |
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| CN101556320B (en) * | 2009-04-30 | 2011-10-26 | 厦门红相电力设备股份有限公司 | On-site calibrating method and device of capacitor voltage transformer |
| CN101620262B (en) * | 2009-06-29 | 2011-08-31 | 江苏省电力公司苏州供电公司 | Fault monitoring method of operating capacitive voltage transformer |
| CN101930033A (en) * | 2010-06-24 | 2010-12-29 | 河南省电力公司商丘供电公司 | Test method without disconnection of capacitor voltage transformer |
| CN102879630A (en) * | 2012-09-17 | 2013-01-16 | 浙江省电力公司电力科学研究院 | Capacitive voltage transformer failure monitoring instrument |
| CN103063931B (en) * | 2013-01-05 | 2014-11-19 | 江苏省电力公司电力科学研究院 | 500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system and testing method thereof |
| CN105182268A (en) * | 2014-05-29 | 2015-12-23 | 国网山西省电力公司电力科学研究院 | Method and device for monitoring operating state of capacitor voltage transformer |
| CN203981862U (en) * | 2014-05-29 | 2014-12-03 | 国网山西省电力公司电力科学研究院 | Capacitance type potential transformer automated watch-keeping facility |
| CN106443200B (en) * | 2016-10-18 | 2023-04-14 | 国网江苏省电力公司电力科学研究院 | Automatic testing device and method for one-time wiring of 1000kV extra-high voltage CVT |
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