CN2713480Y - Signal sampling apparatus for insulated charged detection of electric power capacitive device - Google Patents
Signal sampling apparatus for insulated charged detection of electric power capacitive device Download PDFInfo
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- CN2713480Y CN2713480Y CN 200420078499 CN200420078499U CN2713480Y CN 2713480 Y CN2713480 Y CN 2713480Y CN 200420078499 CN200420078499 CN 200420078499 CN 200420078499 U CN200420078499 U CN 200420078499U CN 2713480 Y CN2713480 Y CN 2713480Y
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Abstract
The utility model relates to a signal sampling apparatus for insulated charged detection of electric power capacitive device, which is that a signal sampling circuit is connected in series with an end screen ground loop of the electric power capacitive device, and the signal sampling circuit comprises a control circuit, a dividing circuit and a protection circuit which are mutually connected in parallel; the control circuit comprises four large power relays, whose normally-closed contact switches are mutually connected in parallel, the dividing circuit comprises four non-inductive resistances which are mutually connected in parallel, and the protection circuit comprises a discharge tube and an instant overvoltage over-current protection device which are connected in parallel; a sampling output end of the detection signal is connected with both ends of the non-inductive resistance. The utility model not only can export the stronger signal, whose phase shift is extremely small, but also can work safely for long time and provide the reliable signal source for the measurement of the rear level circuit.
Description
Affiliated technical field
The utility model relates to electric and electronic technical field, and a kind of a kind of sampler that obtains original signal that provides when electric power capacitive device is under the normal operating condition its insulation data of charged detection is provided.
Background technology
At present, electric power capacitive device is implemented its insulation data of charged detection and is adopted passive sensor to close principle by electromagnetic coupling often to obtain original signal, measure to late-class circuit through cable transmission, because electric power capacitive device is under normal operating condition, its end screen leakage current at several milliamperes between the hundreds of milliampere, therefore, the alternating current of induction output forces down, generally below 1V, and poor anti jamming capability, sensor is owing to exist the influence of excitatory branch road, have angular difference inevitably, and angular difference itself is unstable, causes the insulation data fluctuations that detects big, error is big, causes misjudgment easily.
Summary of the invention
There is signal output poor anti jamming capability in the charged detection signal sampling technique of existing power capacitive apparatus in order to overcome, the defective that signal phase shift is bigger than normal, the utility model provides a kind of not only can export stronger signal, signal phase shift is minimum, and can long-term safety work, measurement provides the electric power capacitive device para tape power detection signal sampler in reliable signal source to late-class circuit.
The technical solution of the utility model is achieved like this: a kind of electric power capacitive device para tape power detection signal sampler, be characterized in: string has signal sampling circuit in the screen ground loop of the end of electric power capacitive device, signal sampling circuit by control circuit, bleeder circuit, holding circuit is parallel with one another constitutes; Control circuit constitutes by the normally closed contact switch of four high power relays is parallel with one another, and bleeder circuit constitutes by four noninductive resistances are parallel with one another, and holding circuit constitutes by a discharge tube is in parallel with instantaneous over-voltage and over-current protector spare; The sampling output terminal of detection signal is connected on the two ends of noninductive resistance.
The utility model during its insulation status of charged detection, provides a kind of signal sampling device under electric power capacitive device is in normal operating condition, it is strong that this device obtains original signal, antijamming capability is good, and signal phase shift is little, for back level metering circuit provides the stable and reliable signal source.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
Embodiment
From Fig. 1 as seen; string has the signal sampling circuit that the normally closed contact switch by four noninductive resistance R1-R4, discharge tube Z, an instantaneous over-voltage and over-current protector spare FV, four high power relays composes in parallel jointly in the screen ground loop of the end of electric power capacitive device, the noninductive resistance resistance is general adopt tens ohm to 2000 ohm between.Ux is the busbar voltage of electric power capacitive device among the figure, and Cx is the equivalent capacity of electric power capacitive device.
The partial pressure type sampler is under off position, four high power relay contacts are in normally off, and whether the input of sectional pressure element depends on the duty of relay, and the relay working power is direct current 12V, provide by back level metering circuit, also can manually provide.
Noninductive resistance R1, R2, R3, R4 form bleeder circuit, and discharge tube Z and instantaneous over-voltage and over-current protector spare FV form holding circuit, and four high power relay JI, J2, J3, J4 form control loop.When four high power relay J1-J4 are in running order, open the contact, leakage current under the equipment running status is exported after noninductive resistance R1-R4 produces pressure drop, output voltage amplitude is established between a few volt to tens volts, after measuring end, disconnect four relay working powers, four relay contacts are in normally off again, and bleeder circuit is out of service.
Four relay J 1-J4 select high power relay for use, under the normal condition, can bear the impact of electric current below tens amperes because equipment end screen leakage current is little, usually several milliamperes between the hundreds of milliampere, its capacity can fully be guaranteed.Resistance R 1-R4 is a noninductive resistance, and the size of resistance is selected according to the size of detected equipment end screen earth leakage current and the size of desired signal, its power be end screen normal leakage electric current resistance on produce 5-10 times of power I2R.Because of the probability that noninductive resistance R1-R4 all opens a way at synchronization minimum; even occurring in the synchronization divider resistance all opens a way; discharge tube Z and instantaneous over-voltage and over-current protector spare FV will play a protective role; prevent that over-voltage and over-current from being born by instantaneous protection device FV; the instantaneous 1500A rush of current that bears of over-voltage and over-current protector spare FV; its withstand voltage can be established between a few volt to tens volts, and the amplitude of output signal is according to actual needs established.
Embodiment 1: with 110KV transformer station current transformer is example.
The 110KV current transformer is under normal operating condition; its end screen leakage current is tens milliamperes; it is 2000 ohm noninductive resistance that resistance R 1-R4 can choose resistance; instantaneous over-voltage and over-current protector spare FV withstand voltage determines below 20V, like this, provide direct current 12V working power to relay after; can obtain the signal source that exchanges about 10V; for the 1000PF current transformer calculates, at this moment, signal output produced phase shift angle less than 1 minute with the max cap..
Embodiment 2: with the 220KV current transformer is example.
The 220KV current transformer is under normal operating condition, its end screen leakage current is tens milliamperes (being generally about 30 milliamperes), it is 2000 ohm noninductive resistance that resistance R 1-R4 can choose resistance, like this, after providing the 12V working power to relay, can obtain the signal that exchanges about 15V, be that the current transformer of 1000PF calculates with the max cap., and the phase shift angle that this moment, signal output produced is also less than 1 minute.
Claims (3)
1, a kind of electric power capacitive device para tape power detection signal sampler is characterized in that: string has signal sampling circuit in the screen ground loop of the end of electric power capacitive device, signal sampling circuit by control circuit, bleeder circuit, holding circuit is parallel with one another constitutes; Control circuit constitutes by the normally closed contact switch of four high power relays is parallel with one another, and bleeder circuit constitutes by four noninductive resistances are parallel with one another, and holding circuit constitutes by a discharge tube is in parallel with instantaneous over-voltage and over-current protector spare; The sampling output terminal of detection signal is connected on the two ends of noninductive resistance.
2, a kind of electric power capacitive device para tape power detection signal sampler according to claim 1, it is characterized in that: the Standard resistance range of described four noninductive resistances is between tens ohm to 2000 ohm.
3, a kind of electric power capacitive device para tape power detection signal sampler according to claim 1 and 2 is characterized in that: the line job contract of described four high power relays is direct current 12V as power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420078499 CN2713480Y (en) | 2004-08-06 | 2004-08-06 | Signal sampling apparatus for insulated charged detection of electric power capacitive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420078499 CN2713480Y (en) | 2004-08-06 | 2004-08-06 | Signal sampling apparatus for insulated charged detection of electric power capacitive device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2713480Y true CN2713480Y (en) | 2005-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420078499 Expired - Fee Related CN2713480Y (en) | 2004-08-06 | 2004-08-06 | Signal sampling apparatus for insulated charged detection of electric power capacitive device |
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| CN (1) | CN2713480Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101188355B (en) * | 2007-11-29 | 2010-04-21 | 北京四方继保工程技术有限公司 | Method for converting the end electric screen current of mutual inductor into line voltage and insulation line monitoring device |
| CN102495311A (en) * | 2011-11-30 | 2012-06-13 | 常州爱特科技有限公司 | End screen lead-out protection system |
| CN103091546A (en) * | 2013-01-12 | 2013-05-08 | 辽宁省电力有限公司鞍山供电公司 | Voltage extracting device |
-
2004
- 2004-08-06 CN CN 200420078499 patent/CN2713480Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101188355B (en) * | 2007-11-29 | 2010-04-21 | 北京四方继保工程技术有限公司 | Method for converting the end electric screen current of mutual inductor into line voltage and insulation line monitoring device |
| CN102495311A (en) * | 2011-11-30 | 2012-06-13 | 常州爱特科技有限公司 | End screen lead-out protection system |
| CN103091546A (en) * | 2013-01-12 | 2013-05-08 | 辽宁省电力有限公司鞍山供电公司 | Voltage extracting device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |