CN103592518A - Method for measuring capacitor dielectric loss and capacitance of capacitor voltage transformer - Google Patents
Method for measuring capacitor dielectric loss and capacitance of capacitor voltage transformer Download PDFInfo
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- CN103592518A CN103592518A CN201310611889.2A CN201310611889A CN103592518A CN 103592518 A CN103592518 A CN 103592518A CN 201310611889 A CN201310611889 A CN 201310611889A CN 103592518 A CN103592518 A CN 103592518A
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Abstract
The invention discloses a method for measuring capacitor dielectric loss and capacitance of a capacitor voltage transformer. The method comprises the steps of enabling a high-voltage lead wire and the grounding end of a dielectric loss tester to be grounded and connecting secondary windings of the capacitor voltage transformer to be in a short-circuit mode; connecting a high-voltage testing wire; enabling the low-voltage end of a voltage-dividing capacitor C2 to be grounded and measuring total dielectric loss tandelta and total capacitance C; enabling the low-voltage end of the voltage-dividing capacitor C2 to be disconnected and grounded and then connecting the low-voltage end to a low-voltage testing wire of the dielectric loss tester, and measuring a dielectric loss value tandelta2 and capacitance C2; calculating a dielectric loss value tandelta1 and capacitance C1. By adopting the method, a large number of working amounts brought by high-voltage lead wire dismantling in the routine inspection testing work is decreased, and on the premise that test data are accurate and reliable, the working efficiency of workers is improved, and the safety risk of inspection testing workers is reduced.
Description
Technical field
The present invention relates to electric power apparatus examination test field, is specifically a kind of condenser dielectric loss and electric capacitance measurement metering method of capacitance type potential transformer.
Background technology
Capacitance type potential transformer (be called for short CVT) because of its have dielectric strength high, can reduce thunderbolt shock head steepness, can and can not double as the advantages such as coupling condenser use with system generation ferroresonance and be widely used in transformer station.But except bus interval, circuit CVT is distributed in the edge of power transformation conventionally, and high-altitude operation vehicle cannot enter; And CVT high-voltage connection is high, thick, long, heavy, while having a power failure at non-full station, induced voltage is very high.So the in the situation that, personnel short at power off time being limited, remove high-voltage connection, adopt positive mode of connection to carry out routine measurement to the capacitor of CVT, workload is large and have sizable security risk.But if do not removed high-voltage connection, with the positive mode of connection of tradition, measure, measurement result has very large error.
Summary of the invention
The object of this invention is to provide a kind of condenser dielectric loss and electric capacitance measurement metering method of capacitance type potential transformer, in the situation that not removing high-voltage connection, measure.
Technical scheme of the present invention is such: a kind of condenser dielectric loss of capacitance type potential transformer and electric capacitance measurement metering method, and working medium loss test instrument is measured; The high-pressure side of the main capacitor C1 of capacitance type potential transformer is connected to high-voltage connection, and low pressure end is connected to the high-pressure side of voltage-dividing capacitor C2; Comprise
Step 4, will be connected to the low voltage experiment line of dielectric loss tester, measuring media loss value tan δ after the low pressure end disconnection ground connection of voltage-dividing capacitor C2
2with electric capacity C
2;
Step 5, calculates dielectric loss value tan δ
1with electric capacity C
1, wherein
C
1=C
always-C
2, tan δ
1=(tan δ
alwaysc
always-tan δ
2c
2)/C
1.
Wherein, capacitance type potential transformer is 110KV capacitance type potential transformer.
Capacitance type potential transformer for 220KV, main capacitor C1 is in series by upper economize on electricity container C 11 and lower economize on electricity container C 12, the high-pressure side of upper economize on electricity container C 11 is connected to high-voltage connection, low pressure end is connected to the high-pressure side of lower economize on electricity container C 12, and the low pressure end of lower economize on electricity container C 12 is connected to the high-pressure side of voltage-dividing capacitor C2.In measurement, the step that connects Hi-pot test line (HV) is: the Hi-pot test line of dielectric loss tester is connected to the low pressure end of upper economize on electricity container C 11, other step is identical with the measuring process of 110KV capacitance type potential transformer.
In the present invention, adopt the full-automatic dielectric loss tester of AI-6000 series to measure.
Technique effect of the present invention is:
1, reduced in regular maintenance experiment work, need to have removed high-voltage connection and many workloads of bringing, in warranty test data, accurately and reliably under prerequisite, improved staff's work efficiency.
2, greatly reduce checking experiment staff's security risk.
Accompanying drawing explanation
Fig. 1 is the dielectric loss value tan δ of the first examples measure 110KV capacitance type potential transformer
alwayswith electric capacity C
alwayscircuit connection diagram.
Fig. 2 is the dielectric loss value tan δ of the voltage-dividing capacitor C2 of the first examples measure 110KV capacitance type potential transformer
2with electric capacity C
2circuit connection diagram.
Fig. 3 is the dielectric loss value tan δ of the second examples measure 220KV capacitance type potential transformer
alwayswith electric capacity C
alwayscircuit connection diagram.
Fig. 4 is the dielectric loss value tan δ of the lower economize on electricity container C 12 series connection voltage-dividing capacitor C2 of the second examples measure 220KV capacitance type potential transformer
2with electric capacity C
2circuit connection diagram.
Embodiment
Fig. 1 shows the dielectric loss value tan δ that measures 110KV capacitance type potential transformer
alwayswith electric capacity C
alwayscircuit connection diagram.During measurement, first by earth terminal 3 ground connection of high-voltage connection 1 and dielectric loss tester 2, each Secondary Winding of short circuit mutual inductor, again the Hi-pot test line HV of dielectric loss tester 2 is connected to voltage-dividing capacitor C2 high-pressure side g, then the grounding switch of voltage transformer (VT) closes, by the low pressure end δ of voltage-dividing capacitor C2 also ground connection, measure afterwards total dielectric loss value tan δ
alwayswith electric capacity C
always.After measurement completes, pull open the grounding switch of voltage transformer (VT), the low pressure end δ ground connection of voltage-dividing capacitor C2 is disconnected, then the low voltage experiment line Cx of dielectric loss tester 2 is connected to the low pressure end δ of voltage-dividing capacitor C2, as shown in Figure 2.Again measure the dielectric loss value tan δ of voltage-dividing capacitor C2
2with electric capacity C
2.Finally according to the data of twice measurement, calculate the dielectric loss value tan δ of main capacitor C1
1with electric capacity C
1, C wherein
1=C
always-C
2, tan δ
1=(tan δ
alwaysc
always-tan δ
2c
2)/C
1.By said method, do not remove the high-voltage connection that is connected to voltage transformer (VT), can obtain dielectric loss value and the electric capacity of main capacitor C1 and the voltage-dividing capacitor C2 of 110KV capacitance type potential transformer.
Fig. 3 shows the dielectric loss value tan δ that measures 220KV capacitance type potential transformer
alwayswith electric capacity C
alwayscircuit connection diagram.During measurement, first by earth terminal 3 ground connection of high-voltage connection 1 and dielectric loss tester 2, each Secondary Winding of short circuit capacitance type potential transformer, again the Hi-pot test line HV of dielectric loss tester 2 is connected to the low pressure end of upper economize on electricity container C 11, on the joint flange of upper economize on electricity container C 11 and lower economize on electricity container C 12, then the close grounding switch of voltage transformer (VT), by the low pressure end δ of voltage-dividing capacitor C2 also ground connection, measures total dielectric loss value tan δ afterwards
alwayswith electric capacity C
always.After measurement completes, pull open the grounding switch of voltage transformer (VT), the low pressure end δ ground connection of voltage-dividing capacitor C2 is disconnected, then by the low voltage experiment line C of dielectric loss tester 2
xbe connected to the low pressure end δ of voltage-dividing capacitor C2, as shown in Figure 4.Again measure the dielectric loss value tan δ that lower economize on electricity container C 12 and voltage-dividing capacitor C2 connect later
2with electric capacity C
2; Finally according to the data of twice measurement, calculate the dielectric loss value tan δ of upper economize on electricity container C 11
1with electric capacity C
1, C wherein
1=C
always-C
2, tan δ
1=(tan δ
alwaysc
always-tan δ
2c
2)/C
1.By said method, do not remove the high-voltage connection that is connected to voltage transformer (VT), can obtain the upper economize on electricity container C 11 of 220KV capacitance type potential transformer and dielectric loss value and the electric capacity after lower economize on electricity container C 12 and voltage-dividing capacitor C2 series connection.
Following table has provided the result of a 220KV capacitance type potential transformer being carried out to on-the-spot contrast test, adopts the full-automatic dielectric loss tester of AI-6000 series to measure, trial voltage 10KV.
On-the-spot contrast test shows, it is feasible not tearing the method that the loss of high-voltage connection measuring media and electric capacity test open, and measurement data is accurately believable.
Claims (5)
1. the condenser dielectric loss of capacitance type potential transformer and an electric capacitance measurement metering method, working medium loss test instrument (2) is measured; The high-pressure side of the main capacitor C1 of capacitance type potential transformer is connected to high-voltage connection (1), and low pressure end is connected to the high-pressure side (g) of voltage-dividing capacitor C2; It is characterized in that, comprise
Step 1, by earth terminal (3) ground connection of high-voltage connection (1) and dielectric loss tester (2), each Secondary Winding of short circuit capacitance type potential transformer;
Step 2, the step of connection Hi-pot test line (HV): the Hi-pot test line (HV) of dielectric loss tester (2) is connected to voltage-dividing capacitor C2 high-pressure side (g);
Step 3, by the low pressure end of voltage-dividing capacitor C2 (δ) ground connection, measuring media loss value tan δ
alwayswith electric capacity C
always;
Step 4, will be connected to the low voltage experiment line (C of dielectric loss tester (2) after the low pressure end of voltage-dividing capacitor C2 (δ) disconnection ground connection
x), measuring media loss value tan δ
2with electric capacity C
2;
Step 5, calculates dielectric loss value tan δ
1with electric capacity C
1, C wherein
1=C
always-C
2,
Tan δ
1=(tan δ
alwaysc
always-tan δ
2c
2)/C
1.
2. the condenser dielectric loss of capacitance type potential transformer according to claim 1 and electric capacitance measurement metering method, it is characterized in that, described main capacitor C1 is in series by upper economize on electricity container C 11 and lower economize on electricity container C 12, the high-pressure side of upper economize on electricity container C 11 is connected to high-voltage connection (1), low pressure end is connected to the high-pressure side of lower economize on electricity container C 12, and the low pressure end of lower economize on electricity container C 12 is connected to the high-pressure side (g) of voltage-dividing capacitor C2; The step of described connection Hi-pot test line (HV) is: the low pressure end that the Hi-pot test line (HV) of dielectric loss tester (2) is connected to upper economize on electricity container C 11.
3. the condenser dielectric loss of capacitance type potential transformer according to claim 1 and electric capacitance measurement metering method, is characterized in that, described capacitance type potential transformer is 110KV capacitance type potential transformer.
4. the condenser dielectric loss of capacitance type potential transformer according to claim 2 and electric capacitance measurement metering method, is characterized in that, described capacitance type potential transformer is 220KV capacitance type potential transformer.
5. the condenser dielectric loss of capacitance type potential transformer according to claim 1 and electric capacitance measurement metering method, is characterized in that, described dielectric loss tester (2) is the full-automatic dielectric loss tester of AI-6000 series.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105717352A (en) * | 2016-02-04 | 2016-06-29 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Voltage detection unit of capacitor tower capacitance |
| CN106249053A (en) * | 2016-08-19 | 2016-12-21 | 汪锐 | Capacitance type potential transformer dielectric loss method of testing based on resonance characteristic |
| CN107064651A (en) * | 2017-06-07 | 2017-08-18 | 国家电网公司 | It is a kind of adding for without disconnecting power lead test more piece high-voltage capacitor to shield dielectric loss device |
| CN108169575A (en) * | 2018-01-16 | 2018-06-15 | 云南电网有限责任公司电力科学研究院 | The test device and method of a kind of CVT capacitances dielectric loss and capacitance |
| CN110749849A (en) * | 2019-10-15 | 2020-02-04 | 国网山东省电力公司淄博供电公司 | Capacitance voltage transformer dielectric loss and capacitance testing system and method |
| CN111239671A (en) * | 2020-03-12 | 2020-06-05 | 国电大渡河检修安装有限公司 | Method for measuring capacitance and dielectric loss value of upper-node coupling capacitor of CVT (constant-Voltage Transformer) |
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| CN101833043A (en) * | 2010-03-30 | 2010-09-15 | 广元电业局 | Method for measuring electric capacity and dielectric loss of capacitance type voltage transformer |
| CN102116803A (en) * | 2010-12-24 | 2011-07-06 | 温州电力局 | Method for testing capacitance and dielectric loss value of 220KV coupling capacitor |
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2013
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| CN101833043A (en) * | 2010-03-30 | 2010-09-15 | 广元电业局 | Method for measuring electric capacity and dielectric loss of capacitance type voltage transformer |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105717352A (en) * | 2016-02-04 | 2016-06-29 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Voltage detection unit of capacitor tower capacitance |
| CN106249053A (en) * | 2016-08-19 | 2016-12-21 | 汪锐 | Capacitance type potential transformer dielectric loss method of testing based on resonance characteristic |
| CN106249053B (en) * | 2016-08-19 | 2018-10-30 | 汪锐 | Capacitance type potential transformer dielectric loss test method based on resonance characteristic |
| CN107064651A (en) * | 2017-06-07 | 2017-08-18 | 国家电网公司 | It is a kind of adding for without disconnecting power lead test more piece high-voltage capacitor to shield dielectric loss device |
| CN108169575A (en) * | 2018-01-16 | 2018-06-15 | 云南电网有限责任公司电力科学研究院 | The test device and method of a kind of CVT capacitances dielectric loss and capacitance |
| CN108169575B (en) * | 2018-01-16 | 2020-07-17 | 云南电网有限责任公司电力科学研究院 | Method for testing dielectric loss and capacitance of CVT capacitor |
| CN110749849A (en) * | 2019-10-15 | 2020-02-04 | 国网山东省电力公司淄博供电公司 | Capacitance voltage transformer dielectric loss and capacitance testing system and method |
| CN111239671A (en) * | 2020-03-12 | 2020-06-05 | 国电大渡河检修安装有限公司 | Method for measuring capacitance and dielectric loss value of upper-node coupling capacitor of CVT (constant-Voltage Transformer) |
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Application publication date: 20140219 |