CN101106268A - A power testing sampling protection unit - Google Patents
A power testing sampling protection unit Download PDFInfo
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- CN101106268A CN101106268A CNA2006100364959A CN200610036495A CN101106268A CN 101106268 A CN101106268 A CN 101106268A CN A2006100364959 A CNA2006100364959 A CN A2006100364959A CN 200610036495 A CN200610036495 A CN 200610036495A CN 101106268 A CN101106268 A CN 101106268A
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- protection unit
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- power testing
- sampling protection
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Abstract
The invention relates to the power electronic technology field, in particular to a sampling protection unit used to test the insulation of the capacitive equipment. The protection unit is connected with the grounding wire of the tested equipment in series and is composed of a control circuit, a bleeder circuit and a protection circuit connected with each other in parallel. The control circuit is composed of a plurality of parallel connected short contact pieces. The bleeder circuit is composed of a diode bridge which makes the end screen smaller than the 5V. The protection circuit is composed of a discharge tube with the test end connected with the both ends of electric power test sampling protection unit. The input impedance of the electric power test sampling unit is too low, and is capable of being connected with the grounding wire of the tested equipment, which makes the on-line testing convenient, ensures the on-site use safety and prevents the accidental electric shock.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly a kind of apparatus insulated charged sampling protected location of testing capacitor type that is used for.
Background technology
At present, the detection of capacitance type equipment if equipment institute is with voltage very high, is directly measured under the situation of energising, can bring great danger to personal safety, so must turn off power supply earlier before detecting.Yet carried out on-line monitoring both at home and abroad and the live testing experience shows: for the analysis of testing result, the judgement of development trend is even more important, adopts the diagnostic method of relative measurement, analysis-by-synthesis can effectively eliminate the influence of external factor to measurement result.At present used capacitor type checkout equipment is when carrying out high voltage electric equipment insulation preventive trial, exist test many with instrument, instrument, the wiring complexity, be subjected to strong electromagnetic, problem such as measure error is big, and influence live testing accuracy factor mainly contain following some:
When 1, the end screen sampling method that adopts electric capacity to protect is measured capacitance type equipment tan δ and capacitance, should note of the influence of measuring lead wire resistance to tan δ measurement result.When if the reference signal measuring lead wire is the same with tested device measuring lead wire resistance, then error is cancelled out each other little to the measurement result influence.
When 2, adopting the end screen sampling method of resistance protection, then lead resistance is little to the influence of tan δ measured value, and the measurement of capacitance is then had considerable influence.If when the reference signal measuring lead wire was the same with tested device measuring lead wire resistance, then error is cancelled out each other did not have influence to measurement result.
Reference signal, tested device measuring lead wire resistance can think that measurement result is not had influence when 3, sampling method was shielded at the end of employing diode protection.
4, when adopting homophase capacitance type equipment comparative method for measuring tan δ and capacitance, should on the equipment of same bus or two sections buses that directly link to each other, carry out, otherwise can produce bigger error.
5, when adopting homophase capacitance type equipment comparative method for measuring capacitance type potential transformer tan δ and capacitance, be subjected to the influence of intermediate transformer, measurement result has than large deviation, can comprehensively compare by all previous result of the test, judges insulation status according to data situation.
6, when adopting homophase capacitance type equipment comparative method for measuring, should note of the influence of adjacent spaces charged state, and whether charged record tested device adjacent spaces is to measuring.
The development and application of the charged online measuring technique of capacitance type equipment insulation to improving the operation and maintenance level of power equipment, in time scents a hidden danger, and reduces equipment breakdown and has play a part positive.Compare with the insulation preventive trial of routine, the insulation characterisitic of equipment own and " cold conditions " have certain difference under service conditions.So live testing more can reflect apparatus insulated real conditions.
Summary of the invention
In order to overcome the shortcoming that prior art exists, the invention provides the charged online measuring technique of a kind of capacitance type equipment insulation, on the equipment under test earth connection, be connected in series power testing sampling protection unit.The input impedance of this power testing sampling protection unit is extremely low, can directly be serially connected on the equipment under test earth connection to use, and live testing is conveniently carried out, and guarantees the on-the-spot safety of using, and prevents the generation of accidental shock.
The invention has the beneficial effects as follows and realize by following proposal:
The present invention is a kind of power testing sampling protection unit; be serially connected on the equipment under test earth connection; constitute by control circuit, bleeder circuit and protective circuit are parallel with one another; be characterized in that control circuit constitutes by some short circuit sheets are parallel with one another; described bleeder circuit is made of the diode bridge heap that makes the end screen less than 5V; described protective circuit is made of discharge tube, and measuring junction is connected on the two ends of described power testing sampling protection unit.
Described diode bridge heap is made up of 10 diodes, and described 10 diodes are equally divided into 2 limits.The voltage of each diode is between 0.9～1.0V; the end screen sampling method of diode protection is measured the influence that the result is not subjected to wire length to tan δ and capacitance; if loop open circuit in measuring process; diode current flow then; end screen voltage is less than 5V; sustainable after the conducting by the 5A power current, guarantee personal device security.
Described control circuit constitutes by 2 short circuit sheets are parallel with one another, realizes the test loop function.
Live testing of the present invention is meant that under the equipment operation condition equipment being carried out insulation parameter measures, and comparing with the preventive trial of routine has following superiority:
1, equipment needn't be stopped transport, and solves the contradiction of test and system operation.
2, highly sensitive, test result can reflect insulation status in the equipment operation, the insulation defect of the timely and effective discovering device of energy.
3, the test simple and effective reduces labor intensity.
Description of drawings
Fig. 1 is the circuit theory diagrams of present embodiment 1;
Fig. 2 is the circuit theory diagrams of embodiment 2.
Among the figure: short circuit sheet 1, discharge tube 2.
Embodiment
Embodiment 1:
Present embodiment is a preferred forms of the present invention; as shown in Figure 1; power testing sampling protection unit of the present invention; be serially connected on the equipment under test earth connection; constitute by control circuit, bleeder circuit and protective circuit are parallel with one another; control circuit constitutes by 2 short circuit sheets 1 are parallel with one another; protective circuit is made of discharge tube 2; bleeder circuit is made of the diode bridge heap; described diode bridge heap is made up of 10 diodes; 10 diodes are equally divided into 2 limits, and measuring junction is connected on the two ends of described power testing sampling protection unit.
Under the situation of equipment operate as normal, short circuit sheet 1 conducting of power testing sampling protection unit; In the time of need be to Equipment Inspection, disconnect short circuit sheet 1, make the loop open circuit, diode current flow then, end screen voltage is kept the power current by 5A less than 5V after the conducting, connect ammeter at measuring junction, and equipment is carried out sampling and testing.
For live testing conveniently carries out, guarantee the on-the-spot safety of using, prevent that accident (disconnecting as measuring lead wire) from causing equipment end screen open circuit, should install necessary sampling protected location in the equipment bottom.
Embodiment 2:
The power testing sampling protection unit structure of present embodiment and embodiment 1 are together, different is that the diode bridge heap is made up of 4 diodes, and 4 diodes are equally divided into 2 limits, as shown in Figure 2, under the situation of equipment operate as normal, short circuit sheet 1 conducting of power testing sampling protection unit; In the time of need be to Equipment Inspection, disconnect short circuit sheet 1, make the loop open circuit, diode current flow then, end screen voltage is kept the power current by 5A less than 5V after the conducting, connect ammeter at measuring junction, and equipment is carried out sampling and testing.
For live testing conveniently carries out, guarantee the on-the-spot safety of using, prevent that accident (disconnecting as measuring lead wire) from causing equipment end screen open circuit, should install necessary sampling protected location in the equipment bottom.
Claims (3)
1. power testing sampling protection unit; be serially connected on the equipment under test earth connection; constitute by control circuit, bleeder circuit and protective circuit are parallel with one another; it is characterized in that described control circuit is by some short circuit sheets (1) formation parallel with one another; described bleeder circuit is made of the diode bridge heap that makes the end screen less than 5V; described protective circuit is made of discharge tube (2), and measuring junction is connected on the two ends of described power testing sampling protection unit.
2. power testing sampling protection unit according to claim 1 is characterized in that described diode bridge heap is made up of 10 diodes, and described 10 diodes are equally divided into 2 limits.
3. power testing sampling protection unit according to claim 1 is characterized in that described control circuit is by 2 short circuit sheets (1) formation parallel with one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100364959A CN100524999C (en) | 2006-07-14 | 2006-07-14 | A power testing sampling protection unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100364959A CN100524999C (en) | 2006-07-14 | 2006-07-14 | A power testing sampling protection unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101106268A true CN101106268A (en) | 2008-01-16 |
| CN100524999C CN100524999C (en) | 2009-08-05 |
Family
ID=39000017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100364959A Expired - Fee Related CN100524999C (en) | 2006-07-14 | 2006-07-14 | A power testing sampling protection unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100524999C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548943A (en) * | 2016-01-25 | 2016-05-04 | 中国南方电网有限责任公司超高压输电公司梧州局 | CVT capacitor online monitoring method based on CVT secondary voltage monitoring |
| CN110488068A (en) * | 2019-08-07 | 2019-11-22 | 国网河北省电力有限公司 | A kind of sampling unit on capacitance type potential transformer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2470838Y (en) * | 2001-02-27 | 2002-01-09 | 广东省电力工业局试验研究所 | Insulated charged detecting-sampling protector of high-voltage electric equipment |
| CN200968973Y (en) * | 2006-07-14 | 2007-10-31 | 广州南方电力集团科技发展有限公司 | Electric power experiment sampling protection unit |
-
2006
- 2006-07-14 CN CNB2006100364959A patent/CN100524999C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548943A (en) * | 2016-01-25 | 2016-05-04 | 中国南方电网有限责任公司超高压输电公司梧州局 | CVT capacitor online monitoring method based on CVT secondary voltage monitoring |
| CN105548943B (en) * | 2016-01-25 | 2018-06-19 | 中国南方电网有限责任公司超高压输电公司梧州局 | A kind of CVT capacitance on-line monitoring methods based on the monitoring of CVT secondary voltages |
| CN110488068A (en) * | 2019-08-07 | 2019-11-22 | 国网河北省电力有限公司 | A kind of sampling unit on capacitance type potential transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100524999C (en) | 2009-08-05 |
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Granted publication date: 20090805 Termination date: 20130714 |