CN106054101A - Live verification method of current transformer - Google Patents

Live verification method of current transformer Download PDF

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Publication number
CN106054101A
CN106054101A CN201610620126.8A CN201610620126A CN106054101A CN 106054101 A CN106054101 A CN 106054101A CN 201610620126 A CN201610620126 A CN 201610620126A CN 106054101 A CN106054101 A CN 106054101A
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CN
China
Prior art keywords
current transformer
conductor
screen layer
current
calibration
Prior art date
Application number
CN201610620126.8A
Other languages
Chinese (zh)
Inventor
邓占锋
陈硕
牛晓晨
刘占元
侯继彪
郑天祥
李璐
孙海江
李春城
Original Assignee
全球能源互联网研究院
国家电网公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 全球能源互联网研究院, 国家电网公司 filed Critical 全球能源互联网研究院
Priority to CN201610620126.8A priority Critical patent/CN106054101A/en
Publication of CN106054101A publication Critical patent/CN106054101A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the preceding groups
    • G01R35/02Testing or calibrating of apparatus covered by the preceding groups of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

Abstract

The invention provides a live verification method of a current transformer. The method comprises a step of shielding the magnetic field generated by the current which goes through a primary side conductor in a current transformer to be detected, a step of introducing current into the current transformer to be detected, a step of detecting the real value of verification current, and a step of calculating the measurement error of the current transformer to be detected. Compared with the prior art, the live verification method and system of a current transformer provided by the invention have the advantages that the interference of a verification result by the current in the primary side conductor is eliminated by the shielding layer, the reliability of verification is improved, and the live detection of the current transformer to be detected is realized at the same time.

Description

A kind of charged method of calibration of current transformer
Technical field
The present invention relates to current transformer calibration technology field, be specifically related to the charged verification side of a kind of current transformer Method.
Background technology
In the circuit of generating, power transformation, transmission of electricity, distribution and electricity consumption, size of current great disparity, has to several Wan An from several peaces.For Being easy to measure, protect and control to need to be converted to the electric current that comparison is unified, additionally the voltage on circuit is the highest, as directly It is breakneck for connecing measurement.Current transformer just plays current transformation and electrical isolation effect, and it is to measure in power system The secondary device such as instrument, relay protection obtains the sensor of electrical primary loop current information, and high electric current is pressed by current transformer Ratio is converted into low current, and its side joint is in primary system, secondary side joint measuring instruments, relay protection etc..At present to electric current The output verification of transformer typically uses Comparison Method, specifically: is first had a power failure by equipment or utilizes up-flow in the case of off-line Device exports experiment electric current to the first side winding of standard current transformer and tested current transformer simultaneously, secondly by tested electric current The secondary side output valve of transformer is compared with the secondary side output valve of standard current transformer, calculates tested Current Mutual Inductance The output error of device.But this method having a power failure or can only be carried out under off-line state, it is impossible to carries out charged to current transformer Detection, particularly can not verify the current transformer after charged for replacement.
Summary of the invention
For the deficiencies in the prior art, the invention provides the charged method of calibration of a kind of current transformer.
The technical scheme is that
Described method of calibration includes:
Shield and current transformer to be checked flows through the electromagnetic field that the electric current of primary side conductor produces;
Verification electric current is introduced to described current transformer to be checked;
Calculate the measurement error of current transformer to be checked.
The optimal technical scheme that the present invention further provides is: described primary side conductor is arranged on current transformer to be checked Inside sensor coil;
The electromagnetic field of the electric current generation that primary side conductor is flow through in described shielding includes: at described primary side conductor and sensitive line A screen layer is embedded between circle;
Described to current transformer to be checked introduce verification electric current include: between described screen layer and sensor coil, arrange one Individual auxiliary conductor;Verification electric current is applied to described auxiliary conductor.
The optimal technical scheme that the present invention further provides is:
Described screen layer is an independent ring shielding layer;Or,
Described screen layer comprises multiple shielding part, and the plurality of shielding part is connected with each other or separate.The present invention enters one The optimal technical scheme that step provides is: described screen layer uses conductive magneto-conductive screen layer, conducts electricity not magnetic conduction screen layer, magnetic conduction and do not lead Shield layer, semiconductive half magnetic conduction screen layer, semiconductive magnetic conduction screen layer, semiconductive not magnetic conduction screen layer, non-conductive half magnetic conduction Any one screen layer in screen layer and conduction half magnetic conduction screen layer.
The optimal technical scheme that the present invention further provides is: described ring shielding layer and shielding part are by multiple component groups Become;
Described component is tubular element or flat member;
Described component uses rigid material to make or use flexible material to make;
Described component is by being wound around or being connected with each other by the way of braiding;Or, described component is mutual by buckle or flange Connect.
The optimal technical scheme that the present invention further provides is:
Described auxiliary conductor is an independent tubular shape conductor;Or,
The plurality of conductor is connected with each other or independent, and the plurality of conductor is uniformly arranged or uneven arrangement, the plurality of The material of conductor is identical or different.
The optimal technical scheme that the present invention further provides is: described auxiliary conductor uses in cable, wire and winding displacement appoints A kind of conductor.
Compared with immediate prior art, the invention has the beneficial effects as follows:
1, the charged method of calibration of a kind of current transformer that the present invention provides, screen layer eliminates electricity in primary side conductor The stream interference to check results, improves the reliability of verification, also achieves the live detection to current transformer to be checked simultaneously;
2, the charged method of calibration of a kind of current transformer that the present invention provides, auxiliary conductor as verification electrical current carriers, I.e. primary side current carrier, by choosing different types of cable, it is possible to achieve to current transformer to be checked detection difference once The verification of measurement error during the electric current of side;
3, the charged method of calibration of a kind of current transformer that the present invention provides, screen layer comprises various structures, Ke Yiwei One independent ring shielding layer, can be interconnective multiple shielding part, it is also possible to for separate multiple shielding parts, Disclosure satisfy that the current transformer demand at different installation environments;
4, the charged method of calibration of a kind of current transformer that the present invention provides, ring shielding layer and shielding part are by multiple Component forms, and component both by being wound around or can be connected with each other by the way of braiding, it is also possible to is connected with each other by buckle or flange, Simple to operation;
5, the charged method of calibration of a kind of current transformer that the present invention provides, auxiliary conductor comprises various structures, permissible It is an independent ring-shaped conductor, it is also possible to include multiple conductor, it is possible to meet the current transformer need at different installation environments Ask;
6, the charged method of calibration of a kind of current transformer that the present invention provides, can not have a power failure at current transformer to be checked In the case of it is carried out field-checking, the long-range transmission of check results can be realized, it is simple to control centre monitors simultaneously.
Accompanying drawing explanation
Fig. 1: the charged method of calibration implementing procedure schematic diagram of a kind of current transformer in the embodiment of the present invention;
Fig. 2: a kind of high-voltage switch gear current transformer schematic diagram embedding screen layer and auxiliary conductor in the embodiment of the present invention;
Fig. 3: the another kind of high-voltage switch gear current transformer signal embedding screen layer and auxiliary conductor in the embodiment of the present invention Figure;
Figure: 4: in the embodiment of the present invention, the charged method of calibration of a kind of current transformer implements system schematic;
In figure, 11: the primary side conductor of high-voltage switch gear current transformer;12: the sensitive line of high-voltage switch gear current transformer Circle;13: screen layer;14: auxiliary conductor;21: current transformer to be checked;22: standard current transformer;23: tester;24: adjust Depressor;25 current lifting devices.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely illustrated, it is clear that described embodiment is The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
Combine accompanying drawing separately below, the charged method of calibration of a kind of current transformer that the embodiment of the present invention provides is carried out Explanation.
Fig. 1 is the charged method of calibration implementing procedure schematic diagram of a kind of current transformer in the embodiment of the present invention, such as figure institute Show, the concretely comprising the following steps of the charged method of calibration of current transformer to be checked in the present embodiment:
Step S101: shield and flow through the electromagnetic field that the electric current of primary side conductor produces in current transformer to be checked.
The method shielding above-mentioned electromagnetic field in the present embodiment is:
One layer of screen layer is embedded between the sensor coil of primary side conductor and current transformer to be checked.At this electromagnetic shielding Under the effect of layer, the sensor coil electric current that the primary side conductor in the normal work of sensing does not flows through.Wherein sensor coil is permissible For the optical fiber sensor head of optical fiber current mutual inductor, can be the air core coil of Luo-coil formula transformer, it is also possible to for core through type The Secondary Winding of electronic type optical fiber current mutual inductor.
In the present embodiment screen layer use conductive magneto-conductive screen layer, conduct electricity not magnetic conduction screen layer, the non-conductive screen layer of magnetic conduction, Semiconductive half magnetic conduction screen layer, semiconductive magnetic conduction screen layer, semiconductive not magnetic conduction screen layer, non-conductive half magnetic conduction screen layer and lead Any one screen layer in electricity half magnetic conduction screen layer.
In the present embodiment, screen layer mainly includes two kinds of structures, specifically:
1, screen layer is an independent ring shielding layer.Wherein,
Ring shielding layer comprises multiple component, and each component is tubular element or flat member, and above-mentioned component can pass through It is wound around or the mode of braiding is connected with each other, it is also possible to be connected with each other by buckle or flange.
2, screen layer includes multiple shielding part.Plurality of shielding part can interconnect mutually, it is also possible to separate.
Shielding part comprises multiple component, and each component is tubular element or flat member, and above-mentioned component can be by being wound around Or the mode of braiding is connected with each other, it is also possible to be connected with each other by buckle or flange.
Step S102: introduce verification electric current to current transformer to be checked.
The method introducing verification electric current in the present embodiment is:
By step S101, shield and current transformer to be checked flows through the electromagnetic field that the electric current of primary side conductor produces Time, current transformer to be checked embeds one layer of screen layer, then introduce verification electric current between primary side conductor and sensor coil Can arrange between this screen layer and sensor coil that at least one auxiliary conductor and all auxiliary conductors are the most also wrapped in shielding In Ceng, sensor coil can only sense the electric current flow through in auxiliary conductor.Now apply verification electric current, i.e. high-ranking officers to auxiliary conductor Galvanoscope introduces current transformer to be checked.
Any one conductor during auxiliary conductor uses cable, wire and winding displacement in the present embodiment.
In the present embodiment, auxiliary conductor mainly includes two kinds of structures, specifically:
1, auxiliary conductor is an independent ring-shaped conductor.
2, auxiliary conductor includes multiple conductor.Wherein, multiple conductors can uniformly be arranged and can also uneven be arranged, multiple Conductor can be connected with each other, it is also possible to separate, and the material of multiple conductors can be the same or different.
Fig. 2 is a kind of high-voltage switch gear current transformer signal embedding screen layer and auxiliary conductor in the embodiment of the present invention Figure, as it can be seen, sensor coil 12 is in the outside of Primary Conductor 11 in the present embodiment, screen layer 13 be embedded in Primary Conductor 11 with Between sensor coil 12, and sensor coil 12 is wrapped in screen layer 13, and under the effect of this screen layer 13, sensor coil 12 is not The electric current that primary side conductor 11 in the normal work of sensing flows through.As it can be seen, in the present embodiment screen layer 13 be one solely Vertical ring shielding layer, auxiliary conductor is an independent ring-shaped conductor.
Fig. 3 is the another kind of high-voltage switch gear current transformer signal embedding screen layer and auxiliary conductor in the embodiment of the present invention Figure, as it can be seen, sensor coil 12 is in the outside of Primary Conductor 11 in the present embodiment, screen layer 13 be embedded in Primary Conductor 11 with Between sensor coil 12, auxiliary conductor 14 is arranged between screen layer 13 and sensor coil 12, under the effect of this screen layer 13, Sensor coil 12 electric current that the primary side conductor 11 in the normal work of sensing does not flows through, only senses in auxiliary conductor 14 and flows through Verification electric current.As it can be seen, screen layer 13 is made up of eight shielding parts in the present embodiment, auxiliary conductor includes four conductors, And four conductor arrangements separate, uneven.
Step S103: calculate the measurement error of current transformer to be checked.
In the present invention, the actual value of detection check electric current can use multiple method, says two of which method below Bright.
(1) direct Detection Method
The present embodiment uses the actual value of current instruments direct detection check electric current.Mutual by comparison electric current to be checked The secondary side output valve of sensor and the actual value of verification electric current, obtain the two ratio and angular difference.Repair according to measurement error results Change the secondary side parameter of current transformer to be checked, revise its measurement error.
(2) indirect method of measurement
By step S101 and step S102, by primary side conductor and sensitive line in current transformer to be checked The electromagnetic field that one layer of screen layer produces is embedded with the electric current of shielding primary side conductor, by screen layer and sensor coil between circle Between arrange that auxiliary conductor is to introduce verification electric current to current transformer to be checked.The most also this auxiliary conductor can be accessed mark The primary side of quasi-current transformer, when auxiliary conductor applies verification electric current, the secondary side output valve of standard current transformer is i.e. For verifying the actual value of electric current.
Combine accompanying drawing separately below, a kind of current transformer provided when the embodiment of the present invention is used the indirect method of measurement Charged method of calibration is implemented system and is illustrated.
Fig. 4 is that the charged method of calibration of a kind of current transformer in the embodiment of the present invention implements system schematic, such as figure institute Showing, in the present embodiment, the charged check system of current transformer includes screen layer 13, auxiliary conductor 14, current transformer to be checked 21, standard current transformer 22, tester 23, pressure regulator 24 and current lifting device 25.Wherein,
Between screen layer 13 is embedded in the sensor coil of current transformer 21 to be checked and primary side leads, and sensor coil parcel In screen layer 13, flow through, for shielding, the electromagnetic field that the electric current of primary side conductor produces.In the present embodiment, screen layer 13 is got rid of The electric current interference to check results in primary side conductor, improves the reliability of verification, also achieves electric current to be checked simultaneously The live detection of transformer 21.
Auxiliary conductor 14 is sequentially arranged between the sensor coil of screen layer 13 and current transformer to be checked 21 and is wrapped in In screen layer 13, and the primary side of standard current transformer 22, it is used for transfer check electric current.Auxiliary conductor 14 in the present embodiment As verification electrical current carriers, i.e. primary side current carrier, by choosing different types of cable, it is possible to achieve mutual to electric current to be checked The verification of measurement error when sensor 21 detects different primary side current.
The secondary side of current transformer 21 to be checked and standard current transformer 22 is all connected with tester 23, and it is used for calculating The measurement error of current transformer 21 to be checked.The present embodiment uses the true of standard current transformer 22 detection check electric current Value, improves the checking precision of system.Meanwhile, use a tester 23 to current transformer 21 to be checked and normalized current mutual inductance The two paths of signals of device 22 is compared, simple, convenient.
One end of pressure regulator 24 connects voltage source (AC380V), and the other end connects current lifting device 25.This pressure regulator 24 is used for adjusting The output electric current of joint current lifting device 25.Current lifting device 25 is for applying verification electric current to auxiliary conductor 14.Pressure regulator 24 in the present embodiment With current lifting device 25 cooperating, jointly adjust the verification size of current being applied on auxiliary conductor 14, thus realize electricity to be checked The verification of measurement error when current transformer 21 detects different primary side current.
In the present embodiment, the charged check system of current transformer also includes combining unit MU and communication unit GPS.Merge Unit MU connects respectively at fiber coupler SC, tester 23 and the communication unit GPS of current transformer 21 to be checked, communicates simultaneously Unit GPS is also connected with tester 23.Wherein,
Combining unit MU, for transmitting the secondary side output valve of current transformer 21 to be checked.
Communication unit GPS, for the measurement error results of long-distance transmissions optical fiber to be checked six transformer 21.
The situation that in the present embodiment, the charged check system of current transformer can not have a power failure at current transformer 21 to be checked Under it is carried out field-checking, the long-range transmission of check results can be realized, it is simple to control centre monitors simultaneously.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment system, be permissible Instructing relevant hardware by computer program to complete, described program can be stored in a computer read/write memory medium In, this program is upon execution, it may include such as the flow process of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic Dish, CD, read-only store-memory body (Read-Only, ROM) or random store-memory body (Random Access Memory, RAM) etc..
Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the present invention to the present invention God and scope.So, if these amendments of the present invention and modification belong to the scope of the claims in the present invention and equivalent technologies thereof Within, then the present invention is also intended to comprise these change and modification.

Claims (7)

1. the charged method of calibration of a current transformer, it is characterised in that described method of calibration includes:
Shield and current transformer to be checked flows through the electromagnetic field that the electric current of primary side conductor produces;
Verification electric current is introduced to described current transformer to be checked;
Calculate the measurement error of current transformer to be checked.
The charged method of calibration of a kind of current transformer the most as claimed in claim 1, it is characterised in that described primary side conductor It is arranged on inside the sensor coil of current transformer to be checked;
Described shielding is flow through the electromagnetic field that the electric current of primary side conductor produces and is included: described primary side conductor and sensor coil it Between embed a screen layer;
Described to current transformer to be checked introduce verification electric current include: arrange between described screen layer and sensor coil one auxiliary Assistant director of a film or play's body;Verification electric current is applied to described auxiliary conductor.
The charged method of calibration of a kind of current transformer the most as claimed in claim 2, it is characterised in that described screen layer is one Individual independent ring shielding layer;Or,
Described screen layer comprises multiple shielding part, and the plurality of shielding part is connected with each other or separate.
The charged method of calibration of a kind of current transformer the most as claimed in claim 2, it is characterised in that described screen layer uses Conductive magneto-conductive screen layer, conduct electricity not magnetic conduction screen layer, the non-conductive screen layer of magnetic conduction, semiconductive half magnetic conduction screen layer, semiconductive and lead Any one shielding in magnetic masking layer, semiconductive not magnetic conduction screen layer, non-conductive half magnetic conduction screen layer and conduction half magnetic conduction screen layer Layer.
The charged method of calibration of a kind of current transformer the most as claimed in claim 3, it is characterised in that described ring shielding layer All it is comprised of multiple members with shielding part;
Described component is tubular element or flat member;
Described component uses rigid material to make or use flexible material to make;
Described component is by being wound around or being connected with each other by the way of braiding;Or, described component is connected with each other by buckle or flange.
The charged method of calibration of a kind of current transformer the most as claimed in claim 2, it is characterised in that
Described auxiliary conductor is an independent tubular shape conductor;Or,
Described auxiliary conductor includes multiple conductor;
The plurality of conductor is connected with each other or independent, and the plurality of conductor is uniformly arranged or uneven arrangement, the plurality of conductor Material identical or different.
The charged method of calibration of a kind of current transformer the most as claimed in claim 2, it is characterised in that described auxiliary conductor is adopted With any one conductor in cable, wire and winding displacement.
CN201610620126.8A 2016-07-29 2016-07-29 Live verification method of current transformer CN106054101A (en)

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Application Number Priority Date Filing Date Title
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101644752A (en) * 2009-08-14 2010-02-10 河南电力试验研究院 Online accuracy detection method and system of current transformer
CN101762799A (en) * 2009-09-27 2010-06-30 河南电力试验研究院 Method and system for online detection of voltage transformer precision
CN103630867A (en) * 2013-12-06 2014-03-12 国家电网公司 Mutual inductor electrified verifying device
CN103728582A (en) * 2013-12-04 2014-04-16 国家电网公司 Capacitive voltage divider and intermediate voltage measurement method applied to electrified calibration
CN204832380U (en) * 2015-07-20 2015-12-02 山东泰开互感器有限公司 Novel voltage transformer error checking equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101644752A (en) * 2009-08-14 2010-02-10 河南电力试验研究院 Online accuracy detection method and system of current transformer
CN101762799A (en) * 2009-09-27 2010-06-30 河南电力试验研究院 Method and system for online detection of voltage transformer precision
CN103728582A (en) * 2013-12-04 2014-04-16 国家电网公司 Capacitive voltage divider and intermediate voltage measurement method applied to electrified calibration
CN103630867A (en) * 2013-12-06 2014-03-12 国家电网公司 Mutual inductor electrified verifying device
CN204832380U (en) * 2015-07-20 2015-12-02 山东泰开互感器有限公司 Novel voltage transformer error checking equipment

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