CN105935667A - Quick sorting method for current transformer iron cores - Google Patents
Quick sorting method for current transformer iron cores Download PDFInfo
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- CN105935667A CN105935667A CN201610372559.6A CN201610372559A CN105935667A CN 105935667 A CN105935667 A CN 105935667A CN 201610372559 A CN201610372559 A CN 201610372559A CN 105935667 A CN105935667 A CN 105935667A
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- measured
- iron core
- core
- qualified
- current transformer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
Abstract
The invention discloses a quick sorting method for current transformer iron cores, and relates to the technical field of electricity measurement. The quick sorting method can eliminate complex procedures of one-by-one winding, one-by-one unwinding of excitation windings and winding measurement, shorten working hours and improve the work efficiency, is based on the electromagnetic induction principle, and is scientific and efficient in measurement, judgment and sorting, simple in step, and improved in work efficiency. The quick sorting method is characterized in that an excitation contact communicates with an excitation circuit; a measurement contact communicates with a measurement circuit; excitation signals are applied to the excitation circuit; induction signals are measured in the measurement circuit; and whether an iron core to be detected is qualified or not is judged by comparing figures of the induction signals with a default qualified threshold range. The quick sorting method is mainly used for sorting the current transformer iron cores.
Description
Technical field
The present invention relates to electrical measurement technical field, particularly relate to a kind of quick method for separating of current transformer core.
Background technology
Current transformer (Current transformer) is a kind of common equipment in electric measurement and relay protection, is made up of iron core and winding.Core loss is the invalid energy that the core material of unit mass is consumed under action of alternating magnetic field, is the key factor weighing a current transformer performance, therefore, general by the loss of iron core in measurement current transform er, sorts it.
In prior art, iron core method for separating is: coiling armature winding and secondary windings on iron core to be measured；Use magnetic material tester to apply alternating current at the armature winding of iron core to be measured, make to produce on secondary windings induced voltage；Electronic scale is utilized to obtain the quality of iron core to be measured；The loss numerical value of this iron core to be measured is calculated by loss formula；According to calculating the loss numerical value obtained, this iron core to be measured is sorted.
Above by measuring the method that iron core is sorted by core loss, need coiling armature winding and secondary windings on iron core to be measured, and need again to remove armature winding and secondary windings after measurement terminates, process is complicated, workload is big, expends man-hour, inefficiency；Using magnetic material tester apply alternating current at the armature winding of iron core to be measured and utilize electronic scale to obtain the quality of iron core to be measured, measuring instrument cost is high, and operation complexity, further results in work efficiency low.
Summary of the invention
The quick method for separating of a kind of current transformer core that the present invention provides, connect energized circuit with metering contact correspondence by excitation contact and measure loop, and by excitation contact disconnection corresponding with metering contact energized circuit and measurement loop after measurement terminates, achieve energized circuit and detachably succinctly connect with measure loop, eliminate coiling one by one, one by one dismounting Exciting Windings for Transverse Differential Protection and measure the complicated operation of winding, save man-hour, improve work efficiency；Based on electromagnetic induction principle, measuring, judge, method for separating scientific and effective, step is simple, further increases work efficiency.
For reaching above-mentioned purpose, embodiments of the invention adopt the following technical scheme that
The present invention provides a kind of quick method for separating of current transformer core, including:
The present invention provides a kind of quick method for separating of current transformer core, including:
Connect energized circuit by excitation contact, measure loop by metering contact connection；Described energized circuit and described measurement loop both pass through iron core hollow position to be measured.
Excitation signal is applied in described energized circuit.
Measure the induced signal in described measurement loop.
Contrast described induced signal numerical value and preset qualified threshold range, it is judged that described iron core to be measured is the most qualified: if described induced signal numerical value presets qualified threshold range without departing from described, the most described iron core to be measured is qualified iron core；If described induced signal numerical value presets qualified threshold range beyond described, the most described iron core to be measured is defective iron core.
In conjunction with above-mentioned, the quick method for separating of described current transformer core, use excitation source to apply described excitation signal in described energized circuit.
In conjunction with above-mentioned, the quick method for separating of described current transformer core, described excitation source is alternating current power supply.
In conjunction with above-mentioned, the quick method for separating of described current transformer core, use voltmeter to measure the described induced signal in described measurement loop.
In conjunction with above-mentioned, the quick method for separating of described current transformer core, contrasting described induced signal numerical value and presetting qualified threshold range, it is judged that after described iron core to be measured is the most qualified, also including:
Measure the mass M of described iron core to be measured；
Calculate described core loss P to be measuredS, wherein PS=I × U × M, in formula, I is described excitation signal numerical value, and U is described measurement signal numerical value, and M is described iron core mass figures to be measured；
Contrast described core loss P to be measuredSNumerical value is lost qualified threshold range with presetting, and again judges that described iron core to be measured is the most qualified: if described core loss P to be measuredSNumerical value is qualified iron core without departing from the described qualified threshold range of default loss, the most described iron core to be measured；If described core loss P to be measuredSNumerical value exceeds the described qualified threshold range of default loss, and the most described iron core to be measured is defective iron core.
In conjunction with above-mentioned, the quick method for separating of described current transformer core, contrasting described core loss P to be measuredSNumerical value is lost qualified threshold range with presetting, and after again judging that described iron core to be measured is the most qualified, also includes:
Disconnect described energized circuit by described excitation contact, disconnect described measurement loop by described metering contact.
In conjunction with above-mentioned, the quick method for separating of described current transformer core, use electronic scale to measure the mass M of described iron core to be measured.
In conjunction with above-mentioned, the quick method for separating of described current transformer core, make described measurement loop be symmetrically distributed in described core center axle both sides to be measured.
In conjunction with above-mentioned, the quick method for separating of described current transformer core, described excitation source is milliampere level alternating current power supply.
The quick method for separating of a kind of current transformer core that the present invention provides, including: connect energized circuit by excitation contact, measure loop by metering contact connection；Excitation signal is applied in energized circuit；Measure the induced signal in loop；Contrast induced signal numerical value and default qualified threshold range, it is judged that iron core to be measured is the most qualified；Compared to prior art, the present invention connects energized circuit by excitation contact and measures loop with metering contact correspondence, achieve energized circuit and detachably succinctly connect with measure loop, eliminate coiling one by one, one by one dismounting Exciting Windings for Transverse Differential Protection and measure the complicated operation of winding, save man-hour, improve work efficiency；Based on electromagnetic induction principle, measuring, judge, method for separating scientific and effective, step is simple, further increases work efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, in describing embodiment below, the required accompanying drawing used is briefly described.
Fig. 1 is a kind of current transformer core quick method for separating schematic flow sheet in the embodiment of the present invention 1；
Fig. 2 is a kind of current transformer core quick method for separating schematic flow sheet in the embodiment of the present invention 2.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment
1
The embodiment of the present invention provides a kind of quick method for separating of current transformer core, as it is shown in figure 1, include:
101, connect energized circuit by excitation contact, measure loop by metering contact connection；Described energized circuit and described measurement loop both pass through iron core hollow position to be measured.
Wherein, contact is detachable connecting device, for connected loop.The present embodiment selects U-shaped spring-piece type contact as excitation contact and metering contact.Top, U-shaped spring-piece type contact be provided with metal can electroconductive elastic sheet, treat that one end of connected loop, bottom are fixed to connect for clamping and treat the other end of connected loop.Such as: during connection energized circuit: energized circuit one end has been fixedly connected on bottom excitation contact, only the other end of energized circuit need to be placed at the shell fragment of top, excitation contact and clamp, so that it may realize the succinct connection of energized circuit.In like manner, it is possible to realize measuring the succinct connection in loop.
Electromagnetic induction refers to the conductor being placed in change magnetic flux, can produce electromotive force.Energized circuit and measurement loop are all integrated with multi-turn winding, are equivalent to general Exciting Windings for Transverse Differential Protection respectively and measure winding.Iron core to be measured is the iron core of current transformer, and common both passes through iron core hollow position to be measured for hollow cylinder, energized circuit and measurement loop, according to electromagnetic induction principle, when applying excitation signal in energized circuit, measures in loop and will produce induced signal.
102, in described energized circuit, excitation signal is applied.
Wherein, excitation signal is usually milliampere level ac signal, milliampere level AC excitation source of connecting in energized circuit, opens excitation source so that it is output excitation signal.
103, the induced signal in described measurement loop is measured.
Wherein, based on electromagnetic induction principle when excitation signal is ac signal, measure in loop and will produce induced voltage signal, series voltage table in measuring loop, use voltmeter just can measure the concrete numerical value of this induced voltage signal U.
Core loss is the invalid energy that the core material of unit mass is consumed under action of alternating magnetic field, is the key factor weighing a current transformer performance, generally judges that this current transformer is the most qualified by detection core loss.Core loss computing formula is: Ps=U × I × M, and in formula, I is exciting current numerical value；U is induced voltage numerical value, M be iron core quality to be measured, i.e. core loss Ps be exciting current I, induced voltage U and the product of iron core mass M to be measured.General, the exciting current signal I of AC excitation source output is fixing given value, iron core mass M numerical value with batch same specification current transformer is of substantially equal again, then can be obtained by core loss computing formula: core loss Ps is directly proportional to induced voltage U, therefore can judge that current iron core to be measured is the most qualified according to the induced voltage signal U measured.
104, contrast described induced signal numerical value and preset qualified threshold range, it is judged that described iron core to be measured is the most qualified.
If 1041 described induced signal numerical value preset qualified threshold range without departing from described, the most described iron core to be measured is qualified iron core.
If 1042 described induced signal numerical value preset qualified threshold range beyond described, the most described iron core to be measured is defective iron core.
Hereinafter with simply example, " contrast described induced signal numerical value and preset qualified threshold range, it is judged that iron core to be measured is the most qualified " will be illustrated:
Such as: the default qualified threshold range of A batch current transformer core is 0mV 30mV, the induced voltage recording iron core a is 15mV, the induced voltage of iron core b is 40mV, the induced voltage of iron core c is 29mV, within then the induced voltage 15mV of iron core a is in default qualified threshold range 0mV 30mV, i.e. preset qualified threshold range without departing from described, then iron core a is qualified iron core.The induced voltage of iron core b is that 40mV exceeds default qualified threshold range 0mV 30mV, then iron core b is defective iron core;The induced voltage of iron core c is within 29mV is in default qualified threshold range 0mV 30mV, i.e. presets qualified threshold range without departing from described, then iron core c is qualified iron core.
The quick method for separating of a kind of current transformer core that the present invention provides, including: connect energized circuit by excitation contact, measure loop by metering contact connection；Excitation signal is applied in energized circuit；Measure the induced signal in loop；Contrast induced signal numerical value and default qualified threshold range, it is judged that iron core to be measured is the most qualified；Compared to prior art, the present invention connects energized circuit by excitation contact respectively and measures loop with metering contact, achieve energized circuit and succinctly connect with measure loop, eliminate coiling one by one, one by one dismounting Exciting Windings for Transverse Differential Protection and measure the complicated operation of winding, save man-hour, improve work efficiency；Based on electromagnetic induction principle, measuring, judge, method for separating scientific and effective, step is simple, further increases work efficiency.
Embodiment
2
The embodiment of the present invention provides a kind of quick method for separating of current transformer core, as in figure 2 it is shown, include:
201, connect energized circuit by excitation contact, measure loop by metering contact connection；Described energized circuit and described measurement loop both pass through iron core hollow position to be measured.
Wherein, in order to reduce measurement error, measure loop and be symmetrically distributed in core center axle both sides to be measured.
202, in described energized circuit, excitation signal is applied.
203, the induced signal in described measurement loop is measured.
204, contrast described induced signal numerical value and preset qualified threshold range, it is judged that described iron core to be measured is the most qualified: if described induced signal numerical value presets qualified threshold range without departing from described, the most described iron core to be measured is qualified iron core；If described induced signal numerical value presets qualified threshold range beyond described, the most described iron core to be measured is defective iron core.
205, the mass M of described iron core to be measured is measured.
Wherein, in order to avoid the impact on separation results of the mass M of iron core to be measured, the mass M of iron core to be measured can be measured, calculate its concrete loss PS, thus by core loss PSCarry out iron core sorting to be measured.General, use electronic scale to measure the mass M of described iron core to be measured.
206, described core loss P to be measured is calculatedS, wherein PS=I × U × M, in formula, I is described excitation signal numerical value, and U is described measurement signal numerical value, and M is described iron core mass figures to be measured.I.e. core loss Ps is exciting current I, induced voltage U and the product of iron core mass M to be measured.
207, described core loss P to be measured is contrastedSNumerical value is lost qualified threshold range with presetting, and again judges that described iron core to be measured is the most qualified: if described core loss P to be measuredSNumerical value is qualified iron core without departing from the described qualified threshold range of default loss, the most described iron core to be measured；If described core loss P to be measuredSNumerical value exceeds the described qualified threshold range of default loss, and the most described iron core to be measured is defective iron core.
Below will be with simply example to " contrasting described core loss P to be measuredSNumerical value is lost qualified threshold range with presetting, and again judges that iron core to be measured is the most qualified " illustrate:
Such as: exciting current signal I is 10mA, presetting the qualified threshold range of loss is 0 12 × 10-5, the induced voltage recording iron core a is 15mV, and quality is 401g, and the induced voltage of iron core b is 40mV, and quality is 400g, and the induced voltage of iron core c is 29mV, and quality is 500g, by loss PSFormula can be calculated:
The loss P of iron core aS=10mA×15mV×401g=6×10-5；
The loss P of iron core bS=10mA×40mV×400g=16×10-5；
The loss P of iron core cS=10mA×29mV×500g=14.5×10-5。
Then: the loss P of iron core aS=6×10-5It is 0 12 × 10 without departing from the qualified threshold range of default loss-5, iron core a is qualified iron core；The loss P of iron core bS=16×10-5It is 0 12 × 10 beyond presetting the qualified threshold range of loss-5, iron core b is defective iron core；The loss P of iron core cS=14.5×10-5It is 0 12 × 10 beyond presetting the qualified threshold range of loss-5, iron core c is defective iron core.
From the different separation results of iron core c in the present embodiment and embodiment 1, the impact of core loss be can not ignore by iron core quality, by measuring iron core quality, calculates its concrete loss PS, by core loss PSCarrying out iron core sorting to be measured, sorting degree of accuracy is higher.
Herein it should be understood that the data in above citing are just to convenient explanation, there is no necessary connection with current transformer core real data.
208, disconnect described energized circuit by described excitation contact, disconnect described measurement loop by described metering contact, in order to carry out the sorting of next iron core to be measured.
Wherein, contact is detachable connecting device, after measurement, sorting terminate, only need to can realize energized circuit by being held on the connection end extraction at the shell fragment of contact in energized circuit and measurement loop and measure the disconnection in loop.
The quick method for separating of a kind of current transformer core that the present invention provides, including: connect energized circuit by excitation contact, measure loop by metering contact connection；Excitation signal is applied in energized circuit；Measure the induced signal in loop；Contrast induced signal numerical value and default qualified threshold range, it is judged that iron core to be measured is the most qualified；Energized circuit is disconnected by excitation contact, disconnected by metering contact and measure loop, compared to prior art, the present invention connects energized circuit by excitation contact respectively and measures loop with metering contact, and by excitation contact and metering contact disconnection energized circuit and measurement loop after measurement terminates, it is achieved that energized circuit succinctly connects with the detachable of measurement loop, eliminates coiling one by one, one by one dismounting Exciting Windings for Transverse Differential Protection and measures the complicated operation of winding, save man-hour, improve work efficiency；Based on electromagnetic induction principle, measuring, judge, method for separating scientific and effective, step is simple, further increases work efficiency.
Further, by measuring iron core quality, its concrete loss P is calculatedS, by core loss PSCarrying out iron core sorting to be measured, sorting degree of accuracy is higher.
The above; being only the detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; the change that can readily occur in or replacement, all should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (9)
1. the quick method for separating of current transformer core, it is characterised in that including:
Connect energized circuit by excitation contact, measure loop by metering contact connection；Described energized circuit and described measurement loop both pass through iron core hollow position to be measured；
Excitation signal is applied in described energized circuit；
Measure the induced signal in described measurement loop；
Contrast described induced signal numerical value and preset qualified threshold range, it is judged that described iron core to be measured is the most qualified: if described induced signal numerical value presets qualified threshold range without departing from described, the most described iron core to be measured is qualified iron core；If described induced signal numerical value presets qualified threshold range beyond described, the most described iron core to be measured is defective iron core.
The quick method for separating of current transformer core the most according to claim 1, it is characterised in that:
Excitation source is used to apply described excitation signal in described energized circuit.
The quick method for separating of current transformer core the most according to claim 2, it is characterised in that:
Described excitation source is alternating current power supply.
The quick method for separating of current transformer core the most according to claim 1, it is characterised in that:
Voltmeter is used to measure the described induced signal in described measurement loop.
The quick method for separating of current transformer core the most according to claim 1, it is characterised in that contrasting described induced signal numerical value and presetting qualified threshold range, it is judged that after described iron core to be measured is the most qualified, also including:
Measure the mass M of described iron core to be measured；
Calculate described core loss P to be measuredS, wherein PS=I × U × M, in formula, I is described excitation signal numerical value, and U is described measurement signal numerical value, and M is described iron core mass figures to be measured；
Contrast described core loss P to be measuredSNumerical value is lost qualified threshold range with presetting, and again judges that described iron core to be measured is the most qualified: if described core loss P to be measuredSNumerical value is qualified iron core without departing from the described qualified threshold range of default loss, the most described iron core to be measured；If described core loss P to be measuredSNumerical value exceeds the described qualified threshold range of default loss, and the most described iron core to be measured is defective iron core.
The quick method for separating of current transformer core the most according to claim 5, it is characterised in that contrasting described core loss P to be measuredSNumerical value is lost qualified threshold range with presetting, and after again judging that described iron core to be measured is the most qualified, also includes:
Disconnect described energized circuit by described excitation contact, disconnect described measurement loop by described metering contact.
The quick method for separating of current transformer core the most according to claim 5, it is characterised in that:
Electronic scale is used to measure the mass M of described iron core to be measured.
The quick method for separating of current transformer core the most according to claim 1, it is characterised in that:
Described measurement loop is made to be symmetrically distributed in described core center axle both sides to be measured.
The quick method for separating of current transformer core the most according to claim 1, it is characterised in that:
Described excitation source is milliampere level alternating current power supply.
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| CN201610372559.6A CN105935667B (en) | 2016-05-31 | 2016-05-31 | A kind of quick method for separating of current transformer core |
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| CN202330565U (en) * | 2011-11-08 | 2012-07-11 | 佛山市中研非晶科技股份有限公司 | C-shaped iron core loss testing tool with limiting function |
| CN203561743U (en) * | 2013-11-14 | 2014-04-23 | 中国三冶集团有限公司电气安装工程公司 | Performance testing device for voltage transformer |
| CN104330651A (en) * | 2014-09-30 | 2015-02-04 | 洛阳隆盛科技有限责任公司 | Screening device for high-frequency transformer magnetic core and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3883835A (en) * | 1974-07-10 | 1975-05-13 | Electromagnetic Ind Inc | Ground fault sensor current transformer |
| JPH0247557A (en) * | 1988-08-10 | 1990-02-16 | Fuji Electric Co Ltd | Current detecting apparatus |
| CN201359627Y (en) * | 2009-01-19 | 2009-12-09 | 吴翀俊 | Automatic fully-computerized annular iron core tester |
| CN202126495U (en) * | 2011-06-29 | 2012-01-25 | 刘中阳 | Iron core property comprehensive tester |
| CN202330565U (en) * | 2011-11-08 | 2012-07-11 | 佛山市中研非晶科技股份有限公司 | C-shaped iron core loss testing tool with limiting function |
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