CN103792412B - A kind of metering CT and its metering circuit with calibration interface - Google Patents

A kind of metering CT and its metering circuit with calibration interface Download PDF

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Publication number
CN103792412B
CN103792412B CN201410035812.XA CN201410035812A CN103792412B CN 103792412 B CN103792412 B CN 103792412B CN 201410035812 A CN201410035812 A CN 201410035812A CN 103792412 B CN103792412 B CN 103792412B
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Prior art keywords
metering
input
phase currents
phase
phases
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CN201410035812.XA
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CN103792412A (en
Inventor
陈安军
肖民
金福根
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NANJING JIETAI ELECTRIC POWER EQUIPMENT Co Ltd
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NANJING JIETAI ELECTRIC POWER EQUIPMENT Co Ltd
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Abstract

A kind of metering CT and metering circuit with calibration interface, A phases metering current mulual inductor, B phases metering current mulual inductor, the A phase currents input of the both ends of C phase metering current mulual inductors and metering circuit unit, the input of B phase currents and the both ends of C phase currents input are respectively equipped with termination, the termination at A phases metering current mulual inductor, B phases metering current mulual inductor, C phase metering current mulual inductors both ends is drawn as output and calibrated, the termination extraction that the input of A phase currents, the input of B phase currents and C phase currents of metering circuit unit are inputted to both ends is calibrated as input;The present invention passes through in the input/output terminal increase calibration termination of metering current mulual inductor and metering circuit, wiring calibration can be carried out directly on low-voltage intelligent switch panel, it need not dismantle and open shell, reduce power off time and calibration amount, the operating efficiency of calibration tape function of measuring switch is improved, while avoids the phenomenon opened and broken down when shell is installed again.

Description

A kind of metering CT and its metering circuit with calibration interface
Technical field
The present invention relates to one kind metering CT and metering circuit, and in particular to a kind of metering CT and its meter with calibration interface Measure circuit.
Background technology
With the development of science and technology power industry is quickly grown, the breaker commonly used in power distribution network is gradually adopted with electricity Drive test amount or the intelligent breaker or intelligent switch of metering.The metering CT and metering circuit of intelligent switch or circuit breaker internal are adopted The precision of colleeting comb needs periodic calibration, has the switch of function of measuring at present, measures CT and metering circuit is installed in switch Inside, need during calibration to open switch housing, just can will metering CT terminals access metering device, realize metering CT calibrations;Metering The calibration of circuit is equally opened shell and could calibrated, and workload is big.And the structure of intelligent switch is more complicated, shell opens meter Installed again after amount calibration, often result in the new failure of intelligent switch, reduce the reliability of product.
The content of the invention
Goal of the invention:In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide it is a kind of need not open shell, can be The metering CT and its metering circuit with calibration interface of direct calibration accuracy on switch panel.
Technical scheme:A kind of metering CT and its metering circuit with calibration interface, including A phases metering current mulual inductor, B Phase metering current mulual inductor, C phases metering current mulual inductor and metering circuit unit, the A phases metering current mulual inductor, B phases are counted The input of A phase currents, the B phase currents for measuring current transformer, the both ends of C phase metering current mulual inductors and the metering circuit unit are defeated Enter and be respectively equipped with termination with the both ends of C phase currents input, the A phases metering current mulual inductor both ends termination and A phase currents is defeated Enter both ends termination, the B phases metering current mulual inductor both ends termination inputs both ends termination with B phase currents and the C phases measure electricity Current transformer both ends termination connects with C phase currents input both ends termination by the way that wire is corresponding, and metering circuit unit can Gather A phases, B phases and C phase currents;During calibration measurement current transformer, wire is disconnected, the A phases metering current mulual inductor, B Phase metering current mulual inductor, the termination at C phase metering current mulual inductors both ends are drawn and calibrated as output;Calibration measurement circuit During unit, wire is disconnected, the input of A phase currents, the input of B phase currents and the C phase currents input both ends of the metering circuit unit Termination draw calibrated as input.
Beneficial effect:The present invention increases calibration terminal by the input/output terminal in metering current mulual inductor and metering circuit Head, wiring calibration can be carried out directly on low-voltage intelligent switch panel, open shell without dismounting, reduce power off time With calibration amount, the operating efficiency of calibration tape function of measuring switch is improved, while avoids and opens shell when installing again The phenomenon of failure, it can be applicable on intelligent switch or electric current action breaker.
Brief description of the drawings
Fig. 1 is the principle schematic of the present invention.
Embodiment
Technical solution of the present invention is described in detail below, but protection scope of the present invention is not limited to the implementation Example.
Embodiment:A kind of metering CT and its metering circuit with calibration interface, as shown in figure 1, TA1, which is A phases, measures electricity Current transformer, TA2 are B phases metering current mulual inductor, TA3 is C phase metering current mulual inductors, and metering circuit unit has A phase currents Input, the input of B phase currents and C phase current inputs, A phases metering current mulual inductor, B phases metering current mulual inductor measure with C phases 2. and 3. 4. 1. the both ends of current transformer are respectively equipped with two core sockets, the A phase currents input of metering circuit unit, B phase currents 1. the both ends of input and the input of C phase currents are respectively equipped with two core sockets ' 2. ' and 3. ' 4. '.During normal work, A phases are measured into electricity 1. 1. the two core female terminals of current transformer one end input the two core female terminals of one end with A phase currents ', A phase metering currents it is mutual 3. 3. the two core female terminals of sensor one end input the two core female terminals of one end with A phase currents ' connected with wire, so Metering circuit unit can gather A phase currents;Similarly, B phase currents and C phase currents are accessed into metering circuit by identical cut-in method Unit.
3. and 3. wire, terminal between are when needing independent calibration measurement current transformer, by terminal 1. and 1. ' ' it Between wire disconnect, the terminal of A phases metering current mulual inductor, B phases metering current mulual inductor and C phase metering current mulual inductors both ends 1. 3. being exported with terminal for independent metering current mulual inductor, the precision of directly calibration current transformer can be used to;Metering current is mutual The calibrating principle of sensor is judged according to the no-load voltage ratio electric current ratio of current transformer, if no-load voltage ratio electric current ratio is 400/5, in electric current Transformer punching examines 1. 3. whether terminal exports 5A with terminal by 400A electric current, if meets required precision.
3. and 3. wire, terminal between are when needing independent calibration measurement circuit, by terminal 1. and 1. ' ' between lead Line disconnects, and the input of A phase currents, B phase currents input and 1. C phase currents input the terminal at both ends ' and terminal is 3. ' it is that individually metering is electric Road input interface, it can be used to the precision of direct calibration measurement circuit;The calibrating principle of metering circuit be in terminal 1. ' and terminal 3. ' between load 5A electric currents, metering circuit collects display output current data after electric current, and detecting the current data of display is The no requirement for meeting current precision.
Meanwhile slotted on switch panel and two core sockets are placed in one comprehensively, the minor flaps of switch are left on panel, it is small Cover plate is on the one hand dust-proof, and it is more attractive in appearance on the other hand to hide interface.When needing measurement and calibration, minor flaps are opened, can be carried out The precision of metering current mulual inductor and metering circuit is calibrated.
As described above, although the present invention has been represented and described with reference to specific preferred embodiment, but it must not be explained For to the limitation of itself of the invention., can be right under the premise of the spirit and scope of the present invention that appended claims define are not departed from Various changes can be made in the form and details for it.

Claims (1)

1. a kind of metering CT and its metering circuit with calibration interface, including A phases measure CT, B phase and measure CT, C phase and measure CT With metering circuit unit, it is characterised in that:The A phases, which measure CT, B phase and measure CT with C phases and measure CT both ends, is respectively equipped with two Core socket 1. 2. and 3. 4., the both ends of the input of A phase currents, the input of B phase currents and the input of C phase currents of the metering circuit unit It is respectively equipped with two core sockets 1. ' 2. ' and 3. ' 4. ', 1. the two core female terminals that A phases are measured to CT one end input one with A phase currents The two core female terminals at end are 1. ', A phases measure the two core female terminals of CT one end and the two core sockets of one end are 3. inputted with A phase currents Terminal is 3. ' connected with wire, similarly, B phase currents and C phase currents are accessed into metering circuit unit by identical cut-in method;
3. and 3. wire, terminal between are during calibration measurement CT, by terminal 1. and 1. ' ' between wire disconnect, the A phases are counted 1. 3. amount CT, B phase, which measures CT, C phase and measures the terminal at CT both ends, draws with terminal and is calibrated as output;Calibration measurement circuit 3. and 3. wire, terminal between are during unit, by terminal 1. and 1. ' ' between wire disconnect, the A of the metering circuit unit 1. ' and terminal is 3. ' extraction carries out school to the terminal of phase current input, the input of B phase currents and C phase currents input both ends as input It is accurate.
CN201410035812.XA 2014-01-26 2014-01-26 A kind of metering CT and its metering circuit with calibration interface Active CN103792412B (en)

Priority Applications (1)

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CN201410035812.XA CN103792412B (en) 2014-01-26 2014-01-26 A kind of metering CT and its metering circuit with calibration interface

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Application Number Priority Date Filing Date Title
CN201410035812.XA CN103792412B (en) 2014-01-26 2014-01-26 A kind of metering CT and its metering circuit with calibration interface

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CN103792412A CN103792412A (en) 2014-05-14
CN103792412B true CN103792412B (en) 2018-04-03

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105807129B (en) * 2016-03-02 2018-11-02 中国人民解放军91663部队 Power meter with metering interface and its method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1395106A (en) * 2001-07-07 2003-02-05 余永宽 High, low voltage electric energy metering device for automatically controlling current transformer ratio conversion
CN2886834Y (en) * 2006-04-17 2007-04-04 段志彦 Calibration connecting terminal seat for inset meter
CN201293801Y (en) * 2008-11-18 2009-08-19 河南省电力勘测设计院 Customspass cabinet for metering electric energy

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3422334B2 (en) * 1993-04-16 2003-06-30 株式会社安川電機 Calibration test circuit for ground fault detector

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1395106A (en) * 2001-07-07 2003-02-05 余永宽 High, low voltage electric energy metering device for automatically controlling current transformer ratio conversion
CN2886834Y (en) * 2006-04-17 2007-04-04 段志彦 Calibration connecting terminal seat for inset meter
CN201293801Y (en) * 2008-11-18 2009-08-19 河南省电力勘测设计院 Customspass cabinet for metering electric energy

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PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of invention: Metering CT with calibration interface and metering circuit thereof

Effective date of registration: 20190523

Granted publication date: 20180403

Pledgee: Bank of China, Limited by Share Ltd, Nanjing Xingang branch

Pledgor: Nanjing Jietai Electric Power Equipment Co., Ltd.

Registration number: 2019320000244

PE01 Entry into force of the registration of the contract for pledge of patent right