CN203759170U - Detecting device for winding insulation states of electromagnetic current transformer - Google Patents
Detecting device for winding insulation states of electromagnetic current transformer Download PDFInfo
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- CN203759170U CN203759170U CN201420178413.4U CN201420178413U CN203759170U CN 203759170 U CN203759170 U CN 203759170U CN 201420178413 U CN201420178413 U CN 201420178413U CN 203759170 U CN203759170 U CN 203759170U
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Abstract
The utility model provides a detecting device for winding insulation states of an electromagnetic current transformer. The detecting device comprises a main unit and a man-machine interaction unit used for setting and displaying testing parameters. A microprocessor, a signal acquirer and a signal generator are arranged in the main unit, and the man-machine interaction unit is connected with the microprocessor. The main unit is provided with a test signal output terminal inputting test signals, one end of the test signal output terminal is connected with the signal generator, and the other end of the test signal output terminal is connected with a secondary winding of a tested current transformer. The main unit is further provided with a secondary signal input terminal acquiring feedback signals, one end of the secondary signal input terminal is connected with the signal acquirer and the other end of the same is connected with the secondary winding of the tested current transformer. In the state of no power outage of the current transformer, the winding insulation states of the current transformer can be detected by means of the simple harmonic wave measurement and analysis method, no-power-outage detection can be realized completely, power-outage loss caused by conventional testing can be avoided, and the no-power-outage state maintenance technology of the current transformer is adopted.
Description
Technical field
The utility model belongs to current transformer winding insulation condition detection field, is specifically related to a kind of pick-up unit of electromagnetic current transducer winding insulation situation.
Background technology
Electromagnetic current transducer is mainly made up of iron core and winding, it adopts magnetic induction principle the large current signal in primary circuit in electric system to be transformed into the little current signal that can measure, and the insulating property of its winding have influence on reliability service and the measuring accuracy of current transformer.
Current transformer is one of power infrastructures of power department widespread use; in long-time running, be subject to the factor impacts such as thunderbolt, superpotential; the problem such as the winding of current transformer easily produces degradation of insulation, winding interturn short-circuit, open circuit, the working properly of aspect such as the protection of serious harm electric system, metering, detection carried out.At present, the detection method of the insulation status of electric system to on-the-spot current transformer mainly adopts several as follows: 1, insulation measurement method, the insulation of the winding that the method generally need to be measured current transformer to Secondary Winding, the insulation over the ground of winding, insulation between Secondary Winding, Secondary Winding insulation over the ground etc., test for winding insulation is the same with other insulation test methods, mainly utilize megohmmeter between measured loop, to apply the trial voltage of 2500V, continue the insulating resistance value between 1min measuring circuit, judge insulating resistance value.Winding of General Requirements is greater than 1000M Ω with respect to the insulating resistance value of Secondary Winding, and the insulating resistance value between Secondary Winding is greater than 10M Ω, and need to judge all previous measurement data, can not have significant change.2, excitation property mensuration, the method requires winding of tested current transformer and all Secondary Winding open circuit, the high-pressure side of the Voltage-output by pressure regulator or testing transformer is connected to one end of secondary winding in current transformer to be checked, the secondary winding in current transformer other end to be checked, by the high pressure tail end ground connection of reometer ground connection, pressure regulator or testing transformer, utilizes voltage table to measure the voltage of current transformer test winding.Slowly regulate pressure regulator or testing transformer to boost, read simultaneously and record voltage, the current value of each measurement point.Measure successively the exciting characteristic curve of other Secondary Winding, by judging test findings with all previous test figure and the trial curve of like product.3, direct current resistance m easurem ent method, generally adopt double bridge to measure or instrument for measuring DC resistance is measured to the winding of current transformer, when measurement, electric bridge is accessed respectively in tested winding two ends, non-tested winding must be unsettled, by judging test findings with all previous test figure and the trial curve of like product.
There are the following problems for above-mentioned several detection method: adopt Measuring DC Resistance, when changing-over line, should disconnect the power supply of electric bridge, and to just taking measurement terminal apart after tested short circuit in winding, abundant electric discharge, insufficient and disconnect by force measurement terminal if discharged, easily cause superpotential and damage the major insulation of coil.Adopt insulation measurement method, test influenced by environmental temperaturely, before measuring, tested winding is fully discharged, the reply sample ground connection of discharging after measuring, the influenced factor of measuring process is many.Employing excitation property is measured, should first degaussing (can add the mild lifting of alternating voltage several times) when test, and when test, the saturation voltage of winding excitation property is high, generally should end at 2kV, avoid Secondary Winding insulation to bear too high voltages, trial curve can not arrive flex point, affects the judgement of measurement result.
And, above-mentioned several winding insulation state testing methods all need to be under power down mode, and untie completely under the conditions such as on-the-spot wiring and carry out, need multiple test to coordinate and comprehensively judge, need to configure plurality of devices, and the test condition that process of the test needs is very strict.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of pick-up unit of electromagnetic current transducer winding insulation situation, can under live state, carry out, test condition requirement is low, detection sensitivity is high, the loss of outage of avoiding conventional sense method to bring, provides current transformer live state service technique.
For solving the problems of the technologies described above, embodiment of the present utility model provides a kind of pick-up unit of electromagnetic current transducer winding insulation situation, comprise main frame, for arranging and show the man-machine interaction unit of test parameter, in described main frame, be provided with microprocessor, signal picker and signal generator, described man-machine interaction unit is connected with described microprocessor;
Described main frame is provided with the test signal lead-out terminal that injects test signal, and its one end is connected with described signal generator, and the other end is connected with the Secondary Winding of tested current transformer;
On described main frame, be also provided with the secondary singal input terminal that gathers feedback signal, its one end is connected with described signal picker, and the other end is connected with the Secondary Winding of tested current transformer.
Wherein, in described main frame, be also provided with the storer being connected with described microprocessor, feedback signal and testing result etc. that storage of collected arrives.
Wherein, described man-machine interaction unit comprises display, keyboard and coupled driving circuit.
Wherein, described test signal is simple harmonic wave voltage/current signals.
Wherein, the terminal voltage signal that described feedback signal is described Secondary Winding and the current signal that flows through described Secondary Winding.
The beneficial effect of technique scheme of the present utility model is as follows:
1, the utility model is under current transformer live state, in conjunction with simple harmonic wave Measurement and analysis method, current transformer winding insulation situation is detected, simple harmonic wave Measurement and analysis method is a kind of highly sensitive lossless detection method, completely can not have a power failure and detect, the loss of outage that can avoid conventionally test to bring, realizes current transformer live state service technique.
The signal amplitude that the detection technique of 2, being combined with the utility model adopts is little, response current is controlled at several mA levels, and the simple harmonic wave signal of employing does not affect the normal work of current transformer, and test process is without contact one sub-high pressure, therefore test is irrelevant with electric pressure, realizes safety detection.
3, the utility model effectively save the test duration, manpower and expense, realize without the online measuring technique having a power failure, simple to operate, avoid potential safety hazard, do not exist existing detection technique to require that measuring voltage is high, test condition is loaded down with trivial details, measured value is difficult to the problems such as judgement, security is good, and measuring speed is fast, guarantees the normal operation of current transformer.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model embodiment mono-.
Description of reference numerals:
1, main frame; 10, microprocessor; 11, storer; 12, signal picker; 13, signal generator; 14, test signal lead-out terminal; 15, secondary singal input terminal;
2, keyboard;
3, display;
4, man-machine interaction unit;
5, Secondary Winding;
6, driving circuit.
Embodiment
For making the technical problems to be solved in the utility model, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The utility model need carry out for the detection of existing current transformer winding insulation situation under power down mode, detection technique requirement measuring voltage is high, test condition is loaded down with trivial details, measured value is difficult to the problems such as judgement, and a kind of pick-up unit of electromagnetic current transducer winding insulation situation is provided.
As shown in Figure 1, embodiment of the present utility model provides a kind of pick-up unit of electromagnetic current transducer winding insulation situation, comprise main frame 1, for arranging and show the man-machine interaction unit 4 of test parameter, in described main frame 1, be provided with microprocessor 10, storer 11, signal picker 12 and signal generator 13, described storer 11 is connected with microprocessor 10, for store feedback signal and testing result etc.
Described man-machine interaction unit 4 is connected with described microprocessor 10, and described man-machine interaction unit 4 comprises display 3, keyboard 2 and coupled driving circuit 6.
Described main frame 1 is provided with the test signal lead-out terminal 14 that injects test signal, and its one end is connected with described signal generator 13, and the other end is connected with the Secondary Winding 5 of tested current transformer.
On described main frame 1, be also provided with the secondary singal input terminal 15 that gathers feedback signal, its one end is connected with described signal picker 12, and the other end is connected with the Secondary Winding 5 of tested current transformer.
The utility model detects current transformer winding insulation situation in conjunction with simple harmonic wave Measurement and analysis method, and described test signal is simple harmonic wave voltage/current signals; Described feedback signal is the terminal voltage signal of described Secondary Winding and the current signal that flows through described Secondary Winding.
The utility model is under current transformer live state, in conjunction with simple harmonic wave Measurement and analysis method, current transformer winding insulation situation is detected, simple harmonic wave Measurement and analysis method is a kind of highly sensitive lossless detection method, completely can not have a power failure and detect, the loss of outage that can avoid conventionally test to bring, realizes current transformer live state service technique.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (5)
1. the pick-up unit of an electromagnetic current transducer winding insulation situation, it is characterized in that, comprise main frame, for arranging and show the man-machine interaction unit of test parameter, in described main frame, be provided with microprocessor, signal picker and signal generator, described man-machine interaction unit is connected with described microprocessor;
Described main frame is provided with the test signal lead-out terminal that injects test signal, and its one end is connected with described signal generator, and the other end is connected with the Secondary Winding of tested current transformer;
On described main frame, be also provided with the secondary singal input terminal that gathers feedback signal, its one end is connected with described signal picker, and the other end is connected with the Secondary Winding of tested current transformer.
2. the pick-up unit of electromagnetic current transducer winding insulation situation according to claim 1, is characterized in that, is also provided with the storer being connected with described microprocessor in described main frame.
3. the pick-up unit of electromagnetic current transducer winding insulation situation according to claim 1, is characterized in that, described man-machine interaction unit comprises display, keyboard and coupled driving circuit.
4. the pick-up unit of electromagnetic current transducer winding insulation situation according to claim 1, is characterized in that, described test signal is simple harmonic wave voltage/current signals.
5. the pick-up unit of electromagnetic current transducer winding insulation situation according to claim 1, is characterized in that, the terminal voltage signal that described feedback signal is described Secondary Winding and the current signal that flows through described Secondary Winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420178413.4U CN203759170U (en) | 2014-04-14 | 2014-04-14 | Detecting device for winding insulation states of electromagnetic current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420178413.4U CN203759170U (en) | 2014-04-14 | 2014-04-14 | Detecting device for winding insulation states of electromagnetic current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203759170U true CN203759170U (en) | 2014-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420178413.4U Expired - Fee Related CN203759170U (en) | 2014-04-14 | 2014-04-14 | Detecting device for winding insulation states of electromagnetic current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203759170U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808067A (en) * | 2015-05-13 | 2015-07-29 | 国家电网公司 | Multifunctional digital CT (Computed Tomography) secondary detector |
| CN107957539A (en) * | 2018-01-15 | 2018-04-24 | 云南电网有限责任公司电力科学研究院 | A kind of electromagnetic potential transformer first winding tail end insulation detecting method and device |
-
2014
- 2014-04-14 CN CN201420178413.4U patent/CN203759170U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808067A (en) * | 2015-05-13 | 2015-07-29 | 国家电网公司 | Multifunctional digital CT (Computed Tomography) secondary detector |
| CN104808067B (en) * | 2015-05-13 | 2019-04-19 | 国家电网公司 | Multifunctional digital CT secondary detection instrument |
| CN107957539A (en) * | 2018-01-15 | 2018-04-24 | 云南电网有限责任公司电力科学研究院 | A kind of electromagnetic potential transformer first winding tail end insulation detecting method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20150414 |
|
| EXPY | Termination of patent right or utility model |