CN105935667B - A kind of quick method for separating of current transformer core - Google Patents
A kind of quick method for separating of current transformer core Download PDFInfo
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- CN105935667B CN105935667B CN201610372559.6A CN201610372559A CN105935667B CN 105935667 B CN105935667 B CN 105935667B CN 201610372559 A CN201610372559 A CN 201610372559A CN 105935667 B CN105935667 B CN 105935667B
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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
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- Transformers For Measuring Instruments (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of quick method for separating of current transformer core, it is related to electrical measurement technical field, eliminates coiling one by one, removes Exciting Windings for Transverse Differential Protection one by one and measure the complicated process of winding, save man-hour, improve operating efficiency；Based on electromagnetic induction principle, measurement, judgement, method for separating are scientific and effective, and step is simple, further increases operating efficiency.Drip irrigation device is：Energized circuit is connected by excitation contact, measuring loop is connected by metering contact；Apply excitation signal in energized circuit；Measure the induced signal in measuring loop；Induced signal numerical value is contrasted with presetting qualified threshold range, judges whether iron core to be measured is qualified.Present invention is mainly used for transformer iron core sorting.
Description
Technical field
The present invention relates to electrical measurement technical field, more particularly to a kind of quick method for separating of current transformer core.
Background technology
Current transformer（Current transformer）It is a kind of common equipment in electric measurement and relay protection, by
Iron core and winding composition.Core loss is the invalid energy that the core material of unit mass is consumed under action of alternating magnetic field,
It is the key factor for weighing a current transformer performance, it is therefore, right typically by the loss of iron core in measurement current transform er
It is sorted.
Iron core method for separating is in the prior art：Coiling armature winding and secondary windings on iron core to be measured；Using magnetic
Material testing machine applies alternating current in the armature winding of iron core to be measured, makes to produce induced voltage on secondary windings；Utilize electronic scale
Obtain the quality of iron core to be measured；The loss numerical value of the iron core to be measured is calculated by the way that formula is lost；The loss obtained according to calculating
Numerical value sorts to the iron core to be measured.
Above by the method that is sorted to iron core of measurement core loss, it is necessary on iron core to be measured coiling armature winding
And secondary windings, and armature winding and secondary windings need to be removed again after measurement terminates, process is complicated, and workload is big, consumption
When taking a lot of work, operating efficiency is low；Alternating current is applied in the armature winding of iron core to be measured using magnetic material tester and utilizes electricity
Son claims the quality for obtaining iron core to be measured, and measuring instrument cost is high, and complex operation, and it is low to further result in operating efficiency.
The content of the invention
The quick method for separating of a kind of current transformer core provided by the invention, it is corresponding by excitation contact and metering contact
Connect energized circuit and measuring loop, and after measurement terminates by excitation contact and metering contact correspondingly disconnect energized circuit and
Measuring loop, realize energized circuit and succinctly connected with the detachable of measuring loop, eliminate coiling one by one, remove excitation one by one
The complicated process of winding and measurement winding, saves man-hour, improves operating efficiency；Based on electromagnetic induction principle, measure, sentence
It is disconnected, method for separating is scientific and effective, step is simple, further increases operating efficiency.
To reach 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：
Energized circuit is connected by excitation contact, measuring loop is connected by metering contact；The energized circuit and described
Measuring loop both passes through iron core hollow position to be measured.
Apply excitation signal in the energized circuit.
Measure the induced signal in the measuring loop.
The induced signal numerical value is contrasted with presetting qualified threshold range, judges whether the iron core to be measured is qualified：If institute
State induced signal numerical value and preset qualified threshold range without departing from described, then the iron core to be measured is qualified iron core；If the sensing
Signal numerical value presets qualified threshold range beyond described, then the iron core to be measured is unqualified iron core.
With reference to above-mentioned, the described quick method for separating of current transformer core, using excitation source in the energized circuit
Apply the excitation signal.
With reference to above-mentioned, the described quick method for separating of current transformer core, the excitation source is AC power.
With reference to above-mentioned, the described quick method for separating of current transformer core, the measuring loop is measured using voltmeter
In the induced signal.
With reference to above-mentioned, the described quick method for separating of current transformer core, in the contrast induced signal numerical value and in advance
If qualified threshold range, after judging whether the iron core to be measured is qualified, in addition to：
Measure the mass M of the iron core to be measured；
Calculate the core loss P to be measuredS, wherein PS=I × U × M, I is the excitation signal numerical value in formula, and U is described
Induced signal numerical value, M are the iron core mass figures to be measured；
Contrast the core loss P to be measuredSNumerical value and the default qualified threshold range of loss, judge the iron core to be measured again
It is whether qualified：If the core loss P to be measuredSNumerical value is without departing from the qualified threshold range of the default loss, then the iron to be measured
Core is qualified iron core；If the core loss P to be measuredSNumerical value is beyond the default qualified threshold range of loss, then described to be measured
Iron core is unqualified iron core.
With reference to above-mentioned, the described quick method for separating of current transformer core, the core loss P to be measured is being contrastedSNumber
Value and the default qualified threshold range of loss, after judging whether the iron core to be measured is qualified again, in addition to：
The energized circuit is disconnected by the excitation contact, the measuring loop is disconnected by the metering contact.
With reference to above-mentioned, the described quick method for separating of current transformer core, the iron core to be measured is measured using electronic scale
Mass M.
With reference to above-mentioned, the described quick method for separating of current transformer core, the measuring loop is set to be symmetrically distributed in institute
State core center axle both sides to be measured.
With reference to above-mentioned, the described quick method for separating of current transformer core, the excitation source is milliampere level AC power.
The quick method for separating of a kind of current transformer core provided by the invention, including：Excitation is connected by excitation contact
Loop, measuring loop is connected by metering contact；Apply excitation signal in energized circuit；Measure the sensing letter in measuring loop
Number；Induced signal numerical value is contrasted with presetting qualified threshold range, judges whether iron core to be measured is qualified；Compared to prior art, sheet
Invention correspondingly connects energized circuit and measuring loop by excitation contact with metering contact, realizes energized circuit and measuring loop
Detachable succinct connection, eliminate coiling one by one, remove Exciting Windings for Transverse Differential Protection one by one and measure the complicated process of winding, save work
When, improve operating efficiency；Based on electromagnetic induction principle, measurement, judgement, method for separating are scientific and effective, and step is simple, further
Improve operating efficiency.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Accompanying drawing be briefly described.
Fig. 1 is a kind of quick method for separating schematic flow sheet of current transformer core in the embodiment of the present invention 1；
Fig. 2 is a kind of quick method for separating schematic flow sheet of current transformer core in the embodiment of the present invention 2.
Embodiment
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 carried out clear, complete
Site preparation describes.Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to 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 shown in figure 1, including：
101st, energized circuit is connected by excitation contact, measuring loop is connected by metering contact；The energized circuit and
The measuring loop both passes through iron core hollow position to be measured.
Wherein, contact is detachable connecting device, for connected loop.The present embodiment selects the conduct of U-shaped spring-piece type contact
Excitation contact and metering contact.U-shaped spring-piece type contact top is provided with the electrically conductive shell fragment of metal, and the one of connected loop is treated for clamping
End, bottom is fixedly connected with the other end for treating connected loop.Such as：When connecting energized circuit：Energized circuit one end has been fixedly connected
In excitation contact bottom, the other end of energized circuit need to be only placed at the shell fragment of excitation contact top and clamped, so that it may which realization is encouraged
The succinct connection of magnetic loop.Similarly, the succinct connection of measuring loop can also be realized.
Electromagnetic induction refers to be placed on the conductor in change magnetic flux, can produce electromotive force.Energized circuit and measuring loop are equal
Multi-turn winding is integrated with, is equivalent in general Exciting Windings for Transverse Differential Protection and measurement winding respectively.Iron core to be measured is the iron core of current transformer,
Common both passes through iron core hollow position to be measured for hollow cylinder, energized circuit and measuring loop, according to electromagnetic induction principle, when
When applying excitation signal in energized circuit, induced signal will be produced in measuring loop.
102nd, excitation signal is applied in the energized circuit.
Wherein, excitation signal is usually milliampere level ac signal, milliampere level AC excitation source of being connected in energized circuit,
Excitation source is opened, it is exported excitation signal.
103rd, the induced signal in the measuring loop is measured.
Wherein, based on electromagnetic induction principle when excitation signal is ac signal, sensing will be produced in measuring loop
Voltage signal, the series voltage table in measuring loop, induced voltage signal U specific number can be measured using voltmeter
Value.
Core loss is the invalid energy that the core material of unit mass is consumed under action of alternating magnetic field, is measurement one
The key factor of individual current transformer performance, generally judge whether the current transformer is qualified by detecting core loss.Iron core
Loss calculation formula is：Ps=U × I × M, in formula, I is exciting current numerical value；U is induced voltage numerical value, and M is iron core matter to be measured
Amount, i.e. core loss Ps are the product of exciting current I, induced voltage U and iron core mass M to be measured.In general, AC excitation source are defeated
The exciting current signal I gone out is fixed given value, and with the basic phase of iron core mass M numerical value of batch same specification current transformer
Deng can then be obtained by core loss calculation formula：Core loss Ps is directly proportional to induced voltage U, therefore can be according to the sense measured
Voltage signal U is answered to judge whether current iron core to be measured is qualified.
104th, the induced signal numerical value is contrasted with presetting qualified threshold range, judges whether the iron core to be measured is qualified.
If the 1041, the induced signal numerical value presets qualified threshold range without departing from described, the iron core to be measured is conjunction
Lattice iron core.
If the 1042, the induced signal numerical value presets qualified threshold range beyond described, the iron core to be measured is not conform to
Lattice iron core.
Below will be with simply example to " contrasting the induced signal numerical value with presetting qualified threshold range, judging to be measured
Whether iron core is qualified " illustrate：
Such as：The default qualified threshold range of A batch current transformer cores is 0mV -30mV, measures iron core a sensing
Voltage is 15mV, and iron core b induced voltage is 40mV, and iron core c induced voltage is 29mV, then iron core a induced voltage 15mV
In presetting within qualified threshold range 0mV -30mV, i.e., qualified threshold range is preset without departing from described, then iron core a is qualified
Iron core.Iron core b induced voltage is that 40mV exceeds default qualified threshold range 0mV -30mV, then iron core b is unqualified iron core;
Iron core c induced voltage is that 29mV is within default qualified threshold range 0mV -30mV, i.e., presets qualified threshold without departing from described
It is worth scope, then iron core c is qualified iron core.
The quick method for separating of a kind of current transformer core provided by the invention, including：Excitation is connected by excitation contact
Loop, measuring loop is connected by metering contact；Apply excitation signal in energized circuit；Measure the sensing letter in measuring loop
Number；Induced signal numerical value is contrasted with presetting qualified threshold range, judges whether iron core to be measured is qualified；Compared to prior art, sheet
Invention connects energized circuit and measuring loop by excitation contact with metering contact respectively, realizes energized circuit and measuring loop
Succinct connection, eliminate coiling one by one, one by one remove Exciting Windings for Transverse Differential Protection and measure winding complicated process, save man-hour, carry
High operating efficiency；Based on electromagnetic induction principle, measurement, judgement, method for separating are scientific and effective, and step is simple, further improve
Operating efficiency.
Embodiment 2
The embodiment of the present invention provides a kind of quick method for separating of current transformer core, as shown in Fig. 2 including：
201st, energized circuit is connected by excitation contact, measuring loop is connected by metering contact；The energized circuit and
The measuring loop both passes through iron core hollow position to be measured.
Wherein, in order to reduce measurement error, measuring loop is symmetrically distributed in core center axle both sides to be measured.
202nd, excitation signal is applied in the energized circuit.
203rd, the induced signal in the measuring loop is measured.
204th, the induced signal numerical value is contrasted with presetting qualified threshold range, judges whether the iron core to be measured is qualified：
If the induced signal numerical value presets qualified threshold range without departing from described, the iron core to be measured is qualified iron core；It is if described
Induced signal numerical value presets qualified threshold range beyond described, then the iron core to be measured is unqualified iron core.
205th, the mass M of the iron core to be measured is measured.
Wherein, in order to avoid influence of the mass M to separation results of iron core to be measured, the mass M of measurable iron core to be measured, meter
Calculate its specific loss PS, so as to pass through core loss PSCarry out iron core sorting to be measured.In general, measured using electronic scale described in
The mass M of iron core to be measured.
206th, the core loss P to be measured is calculatedS, wherein PS=I × U × M, I is the excitation signal numerical value in formula, and U is
The measurement signal numerical value, M are the iron core mass figures to be measured.That is core loss Ps be exciting current I, induced voltage U and
The product of iron core mass M to be measured.
207th, the core loss P to be measured is contrastedSNumerical value and the default qualified threshold range of loss, judge described to be measured again
Whether iron core is qualified：If the core loss P to be measuredSNumerical value is without departing from the default qualified threshold range of loss, then described to treat
Survey iron core is qualified iron core；If the core loss P to be measuredSNumerical value is beyond the default qualified threshold range of loss, then described
Iron core to be measured is unqualified iron core.
Below will be with simply example to " the contrast core loss P to be measuredSNumerical value and the default qualified threshold value model of loss
Enclose, judge whether iron core to be measured is qualified again " illustrate：
Such as：Exciting current signal I is 10mA, and it is 0-12 × 10 to preset the qualified threshold range of loss-5, measure iron core a's
Induced voltage is 15mV, and quality 401g, iron core b induced voltage is 40mV, quality 400g, and iron core c induced voltage is
29mV, quality 500g, by the way that P is lostSFormula can be calculated：
Iron core a loss PS=10mA×15mV×401g=6×10-5；
Iron core b loss PS=10mA×40mV×400g=16×10-5；
Iron core c loss PS=10mA×29mV×500g=14.5×10-5。
Then：Iron core a loss PS=6×10-5It is 0-12 × 10 without departing from the default qualified threshold range of loss-5, iron core a is
Qualified iron core；Iron core b loss PS=16×10-5It is 0-12 × 10 beyond the default qualified threshold range of loss-5, iron core b is not
Qualified iron core；Iron core c loss PS=14.5×10-5It is 0-12 × 10 beyond the default qualified threshold range of loss-5, iron core c is
Unqualified iron core.
From the different separation results of iron core c in the present embodiment and embodiment 1, influence of the iron core quality to core loss
It can not ignore, by measuring iron core quality, calculate its specific loss PS, pass through core loss PSIron core sorting to be measured is carried out, point
Select accuracy higher.
Herein it should be noted that：Data in illustrating above illustrate just to convenient, real with current transformer core
Border data have no positive connection.
208th, the energized circuit is disconnected by the excitation contact, described measure back is disconnected by the metering contact
Road, to carry out next iron core sorting to be measured.
Wherein, contact is detachable connecting device, only need to be by energized circuit and measuring loop after measurement, sorting terminate
In be held on connection end at the shell fragment of contact and extract out, you can realize the disconnection of energized circuit and measuring loop.
The quick method for separating of a kind of current transformer core provided by the invention, including：Excitation is connected by excitation contact
Loop, measuring loop is connected by metering contact；Apply excitation signal in energized circuit；Measure the sensing letter in measuring loop
Number；Induced signal numerical value is contrasted with presetting qualified threshold range, judges whether iron core to be measured is qualified；Disconnected and encouraged by excitation contact
Magnetic loop, measuring loop is disconnected by metering contact, compared to prior art, the present invention is touched by excitation contact and measurement respectively
Point connection energized circuit and measuring loop, and energized circuit and survey are disconnected by excitation contact and metering contact after measurement terminates
Measure loop, realize energized circuit and succinctly connected with the detachable of measuring loop, eliminate coiling one by one, one by one dismounting excitation around
Group and the complicated process for measuring winding, save man-hour, improve operating efficiency；Based on electromagnetic induction principle, measurement, judge,
Method for separating is scientific and effective, and step is simple, further increases operating efficiency.
Further, by measuring iron core quality, its specific loss P is calculatedS, pass through core loss PSCarry out iron to be measured
Core sorts, and sorting accuracy is higher.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should using the scope of the claims as
It is accurate.
Claims (8)
- A kind of 1. quick method for separating of current transformer core, it is characterised in that including：Energized circuit is connected by excitation contact, measuring loop is connected by metering contact；The energized circuit and the measurement Loop both passes through iron core hollow position to be measured；Apply excitation signal in the energized circuit；Measure the induced signal in the measuring loop；The induced signal numerical value is contrasted with presetting qualified threshold range, judges whether the iron core to be measured is qualified：If the sense Induction signal numerical value presets qualified threshold range without departing from described, then the iron core to be measured is qualified iron core；If the induced signal Numerical value presets qualified threshold range beyond described, then the iron core to be measured is unqualified iron core；The induced signal numerical value is being contrasted with presetting qualified threshold range, after judging whether the iron core to be measured is qualified, also Including：Measure the mass M of the iron core to be measured；Calculate the core loss P to be measuredS, wherein PS=I × U × M, I is the excitation signal numerical value in formula, and U is the sensing Signal numerical value, M are the iron core mass figures to be measured；Contrast the core loss P to be measuredSWhether numerical value and the default qualified threshold range of loss, judge the iron core to be measured again It is qualified：If the core loss P to be measuredSNumerical value is without departing from the qualified threshold range of the default loss, the then iron core to be measured Qualified iron core；If the core loss P to be measuredSNumerical value exceeds the default qualified threshold range of loss, then the iron core to be measured For unqualified iron core.
- 2. the quick method for separating of current transformer core according to claim 1, it is characterised in that：Apply the excitation signal in the energized circuit using excitation source.
- 3. the quick method for separating of current transformer core according to claim 2, it is characterised in that：The excitation source is AC power.
- 4. the quick method for separating of current transformer core according to claim 1, it is characterised in that：The induced signal in the measuring loop is measured using voltmeter.
- 5. the quick method for separating of current transformer core according to claim 1, it is characterised in that described to be measured contrasting Core loss PSNumerical value and the default qualified threshold range of loss, after judging whether the iron core to be measured is qualified again, in addition to：The energized circuit is disconnected by the excitation contact, the measuring loop is disconnected by the metering contact.
- 6. the quick method for separating of current transformer core according to claim 1, it is characterised in that：The mass M of the iron core to be measured is measured using electronic scale.
- 7. the quick method for separating of current transformer core according to claim 1, it is characterised in that：The measuring loop is set to be symmetrically distributed in the core center axle both sides to be measured.
- 8. the quick method for separating of current transformer core according to claim 2, it is characterised in that：The excitation source is milliampere level AC power.
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| CN105935667B true CN105935667B (en) | 2018-04-10 |
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| 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 |
| 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 |
-
2016
- 2016-05-31 CN CN201610372559.6A patent/CN105935667B/en active Active
Patent Citations (7)
| 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 |
| 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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| CN105935667A (en) | 2016-09-14 |
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