CN201438212U - Electronic current transformer polarity measurement system - Google Patents
Electronic current transformer polarity measurement system Download PDFInfo
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- CN201438212U CN201438212U CN2009200783754U CN200920078375U CN201438212U CN 201438212 U CN201438212 U CN 201438212U CN 2009200783754 U CN2009200783754 U CN 2009200783754U CN 200920078375 U CN200920078375 U CN 200920078375U CN 201438212 U CN201438212 U CN 201438212U
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Abstract
The utility model discloses an electronic current transformer polarity measurement system, which comprises a heavy current generator, a fault wave record file reading unit, a fault wave record file analyzing unit, a phase measurement unit and a measurement result comparison unit. The fault wave record file reading unit reads the fault wave record file in the protected equipment after the protected equipment is started; the fault wave record file analyzing unit analyzes the fault wave record file read by the fault wave record file reading unit so as to analyze the phase relation between the secondary current and the voltage running through the protected equipment; the phase measurement unit measures the phase relation between the current and the voltage of the heavy current generator; and the measurement result comparison unit compares the measurement results of the fault wave record file analyzing unit and the phase measurement unit so as to judge the correctness of the polarities of the current transformer. The electronic current transformer polarity measurement system is capable of effectively checking whether the polarity of the transformer is connected inversely, whether the secondary circuit has faulty connection or disconnection, and the like before the equipment is put into use, thereby greatly improving the operation condition of the primary system.
Description
Technical field
The utility model relates to a kind of electronic current mutual inductor, relates in particular to a kind of electronic current mutual inductor polarity detection system.
Background technology
The effect of current transformer is to be converted to the less secondary current of numerical value to the bigger primary current of numerical value by certain no-load voltage ratio, is used for protecting, purposes such as measurement.As no-load voltage ratio is 400/5 current transformer, can be reality that the current transitions of 400A is the electric current of 5A.
[basic structure]
Electronic current mutual inductor is to adopt based on the optical devices of the luminous effect principle current transformer of new generation as current sensor, also can be referred to as optical current mutual inductor.Be characterized in: the measuring accuracy height, can satisfy simultaneously and measure and the demand signals of protection system; Insulation system is very simple; No magnetic saturation, frequency response range are wide, can test transient state aperiodic component and DC component.The electronic current mutual inductor one-piece construction is divided into once part and secondary part, and once part is connected by optical cable with the secondary part.Be applicable to the current measurement of 35kV and above electric pressure, and pass through optical fiber or Power-over-Ethernet gas surveying instrument and protective relaying device with the form of numeral output and use.
The electronic current mutual inductor one-piece construction is made up of current sense part 110, signal hop 120 and merge cells part 130 3 parts, and its structure diagram as shown in Figure 1.
Merge cells part 130 adopts the standard PC case structure, mainly comprises secondary converter apparatus and combiner device.
[principle of work]
The current sensor of electronic current mutual inductor adopts the sensor based on the luminous effect principle, and its measuring principle as shown in Figure 2.
To the line integral of tested current i surrounding magnetic field intensity, when promptly linearly polarized light passed through magneto-optic memory technique under the effect of magnetic field H, its plane of polarization had rotated
Angle, can describe with following formula:
In the formula, V is the Field constant of magneto-optic memory technique; L is logical optical path length; K is the multiple relation of magnetic field integration and tested electric current.
The current transformer that uses mostly is the conventional current mutual inductor at present, before putting into operation, carry out through-flow test one time, checks whether the no-load voltage ratio and the loop of work tap be correct, checks whether the polar relationship between each winding of mutual inductor meets the sign of nameplate.Whether connected mode and the polar relationship thereof of checking each time of mutual inductor winding are consistent with design.
The method of a conventional through-flow test has: (1) directly injects primary current to the primary side of current transformer with common three-phase maintenance power supply (380V power supply), the phase place and the polarity of electric current in each winding of secondary side measurement current transformer of current transformer (TA).(2) utilize the instantaneous charge-discharge principle of dry cell to detect its polarity when mounted.
Current transformer is the important composition element in the relay protection system, himself characteristic and wiring correctness thereof be directly connected to relay protection system can move reliably with correct operation in fault.Relevant regulations according to power industry standard DL/T 995-2006 " relay protection and power grid security aut.eq. inspection procedure "; for new assembling device; before putting into operation; must carry out through-flow test one time; its purpose is to check whether the no-load voltage ratio of work tap and loop be correct, checks whether the polar relationship between each winding of mutual inductor meets the sign of nameplate.Whether connected mode and the polar relationship thereof of checking each time of mutual inductor winding are consistent with design.
Because there is singularity in the polarity of electronic current mutual inductor, unlike the conventional current mutual inductor tangible CT polarity sign is arranged, and very big difference arranged also on the transmission mode of principle and acquired signal, so through-flow test of existing conventional current transformer uses the inspection polarity method of phase meter instrumentation amount secondary current phase place can not be applicable to the polarity detection of electronic current mutual inductor fully at secondary circuit, so need the new feasible method of a cover that the polarity of electronic current mutual inductor is measured, to guarantee its correctness.
Therefore, behind the employing electronic current mutual inductor, traditional polarity test method can not be suitable for; especially for the vital once through-flow method of differential class protection; if can not find suitable alternative method, then can only after primary system is charged, utilize actual load to detect.Because the subtractive polarity mask method mark polarity that electronic current mutual inductor can not use the conventional current mutual inductor to adopt; the electronic current mutual inductor body does not have P1; the polarity mark of P2; can not utilize the instantaneous charge-discharge principle of dry cell to detect its polarity when mounted; and; its secondary circuit adopts the Optical Fiber Transmission digital signal; can not as the conventional current mutual inductor, proofread and correct to satisfy the needs of distinct device current polarity by secondary circuit; therefore in engineering is used; can there be the undesirable situation of a large amount of current polarities; if detect in the charged back of primary system; then detect numerous contents; need probably to revise in a large number, even may cause the protection malfunction, under the best situation; also can prolong the start-up time of system greatly, totally unfavorable to the operation of system.
As known from the above, because the singularity of electronic current mutual inductor polarity, output signal is a digital signal, unlike the conventional current mutual inductor tangible CT polarity sign and clear and definite polarity definition are arranged, therefore can not adopt conventional CT polarity detection and test method, therefore the new electronic current mutual inductor of installing needs a kind of mensuration system that adapt to himself singularity, confirms the correctness of its polarity.
The utility model content
Technical problem to be solved in the utility model is: whether a kind of electronic current mutual inductor polarity detection system, it is correct to find mutual inductor polarity effectively before equipment puts into operation if being provided.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of electronic current mutual inductor polarity detection system, described electronic current mutual inductor comprises merge cells, protection equipment; Described mensuration system comprises strong current generator, failure wave-recording document reading unit, failure wave-recording file analysis unit, phase measurement unit, measurement result contrast unit.
Strong current generator is through-flow in order to electronic current mutual inductor is carried out once, with the output of strong current generator directly and insert the voltage input end of described merge cells;
The failure wave-recording document reading unit is in order to fetch protection device interior failure wave-recording file after starting protection equipment;
The secondary current of described protection equipment and the phase relation between the voltage are crossed in order to analysis stream the failure wave-recording file that reads from described failure wave-recording document reading unit in failure wave-recording file analysis unit;
The phase measurement unit is in order to the electric current of measurement strong current generator and the phase relation between the voltage;
Measurement result contrast unit is judged the correctness of electronic current mutual inductor polarity in order to the measurement result that contrast failure wave-recording file analysis unit, phase measurement unit obtain with this.
As a kind of preferred version of the present utility model, the phase relation between the current/voltage is measured in described phase measurement unit, reads the phase angle of measuring between electric current and the voltage; Failure wave-recording file analysis unit is judged the Changing Pattern of electric current and voltage in the oscillogram of record ripple file, with the voltage waveform zero crossing is reference point, with the zero crossing of current waveform in contrast, judge that electric current is in advance with respect to voltage or lags behind, and judges the correctness of electronic current mutual inductor polarity with this.
As a kind of preferred version of the present utility model, described system also comprises polarity correction unit, in order to when the polarity of mutual inductor is opposite with desired polarity, docks anti-polarity and proofreaies and correct.
As a kind of preferred version of the present utility model, described polarity correction unit is arranged at the collecting unit inside of described mutual inductor, will connect the anti-pole reversal, and through-flow once more checking.
As a kind of preferred version of the present utility model, described polarity correction unit is arranged at described protection device interior, proofreaies and correct to dock anti-current polarity.
As a kind of preferred version of the present utility model, described phase measurement unit is the phase meter meter.
The utility model uses strong current generator once to carry out through-flow to electronic current mutual inductor, simultaneously directly and insert the voltage input end of merge cells with the output of strong current generator, start protection, fetch protection internal fault record ripple file, the therefrom secondary current of analysis stream overprotection and the phase relation between the voltage; Use the electric current of conventional phase table instrumentation amount strong current generator and the phase relation between the voltage simultaneously, both measurement result is compared, judge the correctness of electronic current mutual inductor polarity with this.Opposite as current polarity with desired polarity, then can be provided with and will connect the anti-pole reversal by the in house software of collecting unit, and through-flow once more checking.Also can proofread and correct current polarity at the protection device interior.
The beneficial effects of the utility model are: the electronic current mutual inductor polarity detection system that the utility model proposes, whether can find mutual inductor polarity before equipment puts into operation effectively connects instead, whether the secondary circuit wiring exists various situations such as wrong and broken string, improves the service condition of primary system greatly.
Description of drawings
Fig. 1 is the structural representation of electronic current mutual inductor.
Fig. 2 is the fundamental diagram of electronic current mutual inductor.
Fig. 3 is the composition synoptic diagram of electronic current mutual inductor polarity detection system.
Fig. 4 is the process flow diagram of electronic current mutual inductor polarity detection method.
Embodiment
Describe preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing.
See also Fig. 3, the utility model has disclosed a kind of electronic current mutual inductor polarity detection system, and described electronic current mutual inductor comprises merge cells 130, protection equipment; Described mensuration system comprises strong current generator 21, failure wave-recording document reading unit, failure wave-recording file analysis unit, phase measurement unit, measurement result contrast unit, polarity correction unit.
Strong current generator is through-flow in order to electronic current mutual inductor is carried out once, with the output of strong current generator directly and insert the voltage input end of described merge cells.
The failure wave-recording document reading unit is in order to fetch protection device interior failure wave-recording file after starting protection equipment.The secondary current of described protection equipment and the phase relation between the voltage are crossed in order to analysis stream the failure wave-recording file that reads from described failure wave-recording document reading unit in failure wave-recording file analysis unit.
The phase measurement unit is in order to the electric current of measurement strong current generator and the phase relation between the voltage.In the present embodiment, described phase measurement unit is a phase meter 22.
Measurement result contrast unit is judged the correctness of electronic current mutual inductor polarity in order to the phase relation measurement result that contrast failure wave-recording file analysis unit, phase measurement unit obtain with this.
If the polarity of mutual inductor is opposite with desired polarity, the anti-polarity of polarity correction unit butt joint is proofreaied and correct.Described polarity correction unit can be arranged at the collecting unit inside of described mutual inductor, will connect the anti-pole reversal, and through-flow once more checking.Described polarity correction unit can also be arranged at described protection device interior, proofreaies and correct to dock anti-current polarity.
More than introduced the composition of the utility model electronic current mutual inductor polarity detection system, below introduced the assay method of said determination system by Fig. 4, this method comprises the steps:
Steps A, to use strong current generator that electronic current mutual inductor is carried out once through-flow, simultaneously with the output of strong current generator directly and insert the voltage input end of described merge cells.
Step B, startup protection equipment, fetch protection device interior failure wave-recording file, therefrom analysis stream is crossed the secondary current of described protection equipment and the phase relation between the voltage.
Step C, the electric current of measuring strong current generator and the phase relation between the voltage; In the present embodiment, use the electric current of phase meter instrumentation amount strong current generator and the phase relation between the voltage.
Step D, the two measurement result is compared; In above-mentioned steps C, use the phase relation between traditional phase measurement table instrumentation amount current/voltage, read the phase angle of measuring between electric current and the voltage; And in above-mentioned steps B, be that the Changing Pattern of electric current and voltage in the oscillogram of record ripple file is judged, with the voltage waveform zero crossing is reference point, with the zero crossing of current waveform in contrast, judge that electric current is in advance with respect to voltage or lags behind, and judges the correctness of electronic current mutual inductor polarity with this.
Step e, opposite with desired polarity as if the polarity of mutual inductor is proofreaied and correct by the anti-polarity of polarity correction unit butt joint.Polarity correction unit can be arranged at the collecting unit inside or the protection device interior of described mutual inductor.On the one hand, can will connect the anti-pole reversal by the in house software setting (being background apparatus 23) of collecting unit, and through-flow once more checking; In addition, also can proofread and correct current polarity at the protection device interior.
In sum, the electronic current mutual inductor polarity detection system that the utility model proposes, can be before equipment puts into operation (before charged) find mutual inductor polarity effectively and whether connect instead, whether the secondary circuit wiring exists various situations such as wrong and broken string, improves the service condition of primary system greatly.
Here description of the present utility model and application are illustrative, are not to want with scope restriction of the present utility model in the above-described embodiments.Here the distortion of disclosed embodiment and change are possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present utility model or essential characteristic, and the utility model can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.Under the situation that does not break away from the utility model scope and spirit, can carry out other distortion and change here to disclosed embodiment.
As, the method for step e lieutenant colonel's positive polarity can also have additive method, is not limited to two kinds described in the step e.
Claims (5)
1. electronic current mutual inductor polarity detection system, described electronic current mutual inductor comprises merge cells, protection equipment; It is characterized in that described mensuration system comprises:
Strong current generator, through-flow in order to electronic current mutual inductor is carried out once, with the output of strong current generator directly and insert the voltage input end of described merge cells;
The failure wave-recording document reading unit is in order to fetch protection device interior failure wave-recording file after starting protection equipment;
The secondary current of described protection equipment and the phase relation between the voltage are crossed in order to analysis stream the failure wave-recording file that reads from described failure wave-recording document reading unit in failure wave-recording file analysis unit;
The phase measurement unit is in order to the electric current of measurement strong current generator and the phase relation between the voltage;
The correctness of electronic current mutual inductor polarity in order to the measurement result that contrast failure wave-recording file analysis unit, phase measurement unit obtain, is judged with this in measurement result contrast unit.
2. electronic current mutual inductor polarity detection according to claim 1 system is characterized in that:
The phase relation between the current/voltage is measured in described phase measurement unit, reads the phase angle of measuring between electric current and the voltage;
Failure wave-recording file analysis unit is judged the Changing Pattern of electric current and voltage in the oscillogram of record ripple file, with the voltage waveform zero crossing is reference point, with the zero crossing of current waveform in contrast, judge that electric current is in advance with respect to voltage or lags behind, and judges the correctness of electronic current mutual inductor polarity with this.
3. electronic current mutual inductor polarity detection according to claim 1 and 2 system is characterized in that:
Described system also comprises polarity correction unit, in order to when the polarity of mutual inductor is opposite with desired polarity, docks anti-polarity and proofreaies and correct.
4. electronic current mutual inductor polarity detection according to claim 3 system is characterized in that:
Described polarity correction unit is arranged at the collecting unit inside of described mutual inductor, will connect the anti-pole reversal, and through-flow once more checking.
5. electronic current mutual inductor polarity detection according to claim 3 system is characterized in that:
Described polarity correction unit is arranged at described protection device interior, proofreaies and correct to dock anti-current polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200783754U CN201438212U (en) | 2009-07-16 | 2009-07-16 | Electronic current transformer polarity measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200783754U CN201438212U (en) | 2009-07-16 | 2009-07-16 | Electronic current transformer polarity measurement system |
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| CN201438212U true CN201438212U (en) | 2010-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009200783754U Expired - Lifetime CN201438212U (en) | 2009-07-16 | 2009-07-16 | Electronic current transformer polarity measurement system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101930063A (en) * | 2009-06-23 | 2010-12-29 | 华东电力试验研究院有限公司 | Polarity detection method and system of electronic current transformer |
| CN104198884A (en) * | 2014-08-06 | 2014-12-10 | 国网山东省电力公司 | Differential principle based large-scale power grid intelligent trouble diagnosis method |
| CN105182164A (en) * | 2015-09-23 | 2015-12-23 | 广东电网有限责任公司佛山供电局 | Electric energy metering secondary loop wiring verification method |
| CN108614165A (en) * | 2018-06-14 | 2018-10-02 | 威胜信息技术股份有限公司 | Fault detector installs the recognition methods of phase sequence |
| CN110082703A (en) * | 2019-05-22 | 2019-08-02 | 国网重庆市电力公司电力科学研究院 | A kind of power distribution network metering device second loop return wiring detection method and device |
| CN110763882A (en) * | 2019-10-30 | 2020-02-07 | 国网宁夏电力有限公司检修公司 | Transient phase-controlled large-current generator and simulation measurement method before commissioning of secondary equipment |
| CN112083372A (en) * | 2020-08-21 | 2020-12-15 | 深圳供电局有限公司 | Current transformer polarity identification method and system |
-
2009
- 2009-07-16 CN CN2009200783754U patent/CN201438212U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101930063A (en) * | 2009-06-23 | 2010-12-29 | 华东电力试验研究院有限公司 | Polarity detection method and system of electronic current transformer |
| CN104198884A (en) * | 2014-08-06 | 2014-12-10 | 国网山东省电力公司 | Differential principle based large-scale power grid intelligent trouble diagnosis method |
| CN104198884B (en) * | 2014-08-06 | 2015-04-08 | 国网山东省电力公司 | Differential principle based large-scale power grid intelligent trouble diagnosis method |
| CN105182164A (en) * | 2015-09-23 | 2015-12-23 | 广东电网有限责任公司佛山供电局 | Electric energy metering secondary loop wiring verification method |
| CN105182164B (en) * | 2015-09-23 | 2018-01-30 | 广东电网有限责任公司佛山供电局 | Electric energy metering secondary wiring method of calibration |
| CN108614165A (en) * | 2018-06-14 | 2018-10-02 | 威胜信息技术股份有限公司 | Fault detector installs the recognition methods of phase sequence |
| CN110082703A (en) * | 2019-05-22 | 2019-08-02 | 国网重庆市电力公司电力科学研究院 | A kind of power distribution network metering device second loop return wiring detection method and device |
| CN110763882A (en) * | 2019-10-30 | 2020-02-07 | 国网宁夏电力有限公司检修公司 | Transient phase-controlled large-current generator and simulation measurement method before commissioning of secondary equipment |
| CN112083372A (en) * | 2020-08-21 | 2020-12-15 | 深圳供电局有限公司 | Current transformer polarity identification method and system |
| CN112083372B (en) * | 2020-08-21 | 2023-12-15 | 深圳供电局有限公司 | Polarity identification method and system for current transformer |
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Granted publication date: 20100414 |