CN207925289U - A kind of open-type zero sequence current mutual inductor - Google Patents

A kind of open-type zero sequence current mutual inductor Download PDF

Info

Publication number
CN207925289U
CN207925289U CN201721909128.5U CN201721909128U CN207925289U CN 207925289 U CN207925289 U CN 207925289U CN 201721909128 U CN201721909128 U CN 201721909128U CN 207925289 U CN207925289 U CN 207925289U
Authority
CN
China
Prior art keywords
iron core
mutual inductor
zero sequence
sequence current
open
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
CN201721909128.5U
Other languages
Chinese (zh)
Inventor
隋广君
柳全仁
隋国成
姜婷婷
于福生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sino Canton Electric Appliance Ltd By Share Ltd
Original Assignee
Sino Canton Electric Appliance Ltd By Share Ltd
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
Publication date
Application filed by Sino Canton Electric Appliance Ltd By Share Ltd filed Critical Sino Canton Electric Appliance Ltd By Share Ltd
Priority to CN201721909128.5U priority Critical patent/CN207925289U/en
Application granted granted Critical
Publication of CN207925289U publication Critical patent/CN207925289U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model discloses a kind of open-type zero sequence current mutual inductor, belongs to mutual inductor apparatus field.It includes iron core, it is wound with secondary line on the iron core, there are two semicircular epoxy packages for setting on outer diameter wall, it is fixedly connected by fixing bolt between the epoxy package, there are two secondary bolts for setting at the top of one of epoxy package, it is covered with secondary connection cover outside two secondary bolts, it is fixedly connected with mounting seat by pedestal fastening bolt at the top of another epoxy package, one end of the secondary line is bolted with secondary, the other end is connect with secondary connection sheet, and the secondary connection sheet is arranged between iron core.A kind of open-type zero sequence current mutual inductor of the utility model, dielectric strength is high, good mechanical property, is suitable for high current, big specification cable, and multiple higher, the relay protection of capacity bigger is protected to use.

Description

A kind of open-type zero sequence current mutual inductor
Technical field
The utility model is related to a kind of open-type zero sequence current mutual inductors, and in particular to a kind of unlatching of high-precision large capacity Formula zero sequence current mutual inductor belongs to mutual inductor apparatus field.
Background technology
The article that power industry uses.Zero sequence current mutual inductor is current transformer with single-turn cored structure, is generally used for electric power Protect equipment such as:Small Electric Current Earthing And Routing Device, microcomputer harmonic elimination device etc. match.
Zero sequence current mutual inductor makes when electric system generates zero sequence earth current with protective relaying device or signal cooperation With, so that device element is acted, realize protection or monitoring.
Zero-sequence current protection concrete application can respectively fill a current transformer on three-phase line(CT), or allow three-phase conducting wire A zero sequence CT is passed through together, a zero sequence CT can be also installed on neutral conductor N, is sweared using these C.T to detect the electric current of three-phase Amount and, i.e. zero-sequence current Io, IA+IB+IC=Io, when the three-phase load complete equipilibrium connect on circuit(No ground failure, and The leakage current of circuit, electrical equipment is not considered), Io=0;When the three-phase load unbalance connect on circuit, then Io=IN, at this time Zero-sequence current be out-of-balance current IN;When earth fault occurs for a certain phase, necessarily lead to a single-phase earth fault current Id, the zero-sequence current IO=IN+Id detected at this time are the vector sums of three phase unbalance current and single-phase-to-ground current.
Action principle
Zero-sequence current protection, which is generally adapted, is used in TN earthed systems.Because when phase ground connection occurs, to TN-S systems Id impedance loops include phase line impedance Z 1, PE line impedences ZPE and contact impedance Zf, i.e. Zs=Z1+ZPE+Zf;For TN-C systems, Id impedance loops include phase line impedance Z 1, protective earthing-neutral conductor impedance Z PEN and contact resistance Zf, i.e. ZS=Z1+ZPEN+Zf;For TN-C-S System, Id impedance loops include phase line impedance Z 1, protective earthing-neutral conductor impedance Z PEN, PE line impedence ZPE and contact resistance Zf, i.e. ZS=Z1+ ZPEN+ZPE+Zf, single-phase earth fault current Id=220/ZS of generation, hence it is evident that it is more than three phase unbalance current when fault-free, As long as it is suitable to adjust, so that it may zero-sequence current when detecting that earth fault occurs, with disengagement failure circuit.And to IT system, one As be that use is more demanding to power supply reliability, immediately cut off unnecessary to single-phase earthing but need to send out insulation at current supply circuit It destroys supervision signal, continue the phase three-wire three distribution wire for not allotting the neutral conductor in the industrial and mining enterprises of power supply a period of time with maintenance Road.
When single-phase earthing, the zero-sequence current that is flowed through on the faulty line be total system non-faulting system capacitive current it With, thus be easy to detect earth-fault current, therefore it can relatively be grounded event for the first time to supervise with zero sequence current protective device Barrier.
TT earthed systems are commonly applied to the three-phase and four-line power distribution system of industrial or agricultural, the illumination of civil buildings, power hybrid power supply In system, often find that three phase unbalance current is larger, when phase ground connection occurs, Id impedance loops include phase line impedance Z 1, PE lines Impedance Z PE, load-side ground resistance RA and mains side ground resistance RB, contact impedance Zf, i.e. ZS=Z1+ZPE+RA+RB+Zf connect Earth fault electric current Id=220/ZS, due to RA+RB>>Z1+ZPE+Zf, and RA+RB numerical value is generally larger, it is evident that TT systems Failure loop circuit impedance is big, and generation singly meets fault current Id, far smaller than out-of-balance current, it is difficult to detect fault current, therefore It is not suitable for TT earthed systems.
Zero sequence CT installations for zero-sequence current protection, have to meet related technological standards.For IT earthed systems, by When singlephase earth fault occurs, the not only possible conductive surface along the cable that breaks down of earth current flows back to, Er Qieke End must be grounded through zero sequence CT when can flow back to, therefore install along the conductive surface of non-faulting cable, just be can guarantee in this way The capacitance current of failure phase and non-faulting phase can prevent protective device when external area error from malfunctioning, and can protect by earth point Device action message when demonstrate,proving failure.
It is general using zero sequence CT is installed on neutral conductor N for IT earthed systems, it must to the zero sequence CT in low-pressure side busbar Neutral conductor N and working earthing point must be installed on(Or multiple grounding)Between busbar on.As zero sequence CT is installed on the N lines of switchboard On busbar, since switchboard metal shell is generally directly connected with earthing pole, when ground short circuit occurs for busbar, the failure of generation Electric current Id will be flowed along switchboard metal shell → ground wire → transformer neutral point, and without zero sequence CT, institute is not achieved It is required that the defencive function realized, is easy to neglect when this point is constructed at the scene.
Utility model content
The utility model provides a kind of open-type zero sequence current mutual inductor, is poured with epoxy resin retractable structure, supplies Rated voltage 10KV and 10KV or less, rated frequency are used for relay protection to make in the indoor circuit and its equipment of 50HZ or 60HZ.
The utility model solves above-mentioned technical problem by following technological means:
A kind of open-type zero sequence current mutual inductor of the utility model comprising iron core is wound on the iron core secondary Line, on outer diameter wall setting pass through fixed spiral shell between the epoxy package there are two semicircular epoxy package Bolt is fixedly connected, secondary bolt there are two settings at the top of one of epoxy package, and two are covered with outside two secondary bolts Secondary separate terminal enclosure, another epoxy package top are fixedly connected by pedestal fastening bolt with mounting seat, the secondary line One end be bolted with secondary, the other end is connect with secondary connection sheet, and the secondary connection sheet is arranged between iron core.
The mounting seat is several fonts.
The iron core uses cold-reduced silicon sheet, anneals by winding.
The iron core is cyclic structure.
The utility model zero sequence current mutual inductor is open-type structure, and iron core uses high-quality cold-reduced silicon sheet, anneals by winding It forms, iron loss is small, flux density is low, and product data are good, and performance is stablized.Iron core and secondary winding are together with good poured with epoxy resin It forms, dielectric strength is high, good mechanical property, can be used for electric power detection, control, metering, protection system, industrial and mining enterprises, high level are built The places such as matching in building, power transformation.
This product is the pinpoint accuracy zero sequence current mutual inductor completely newly developed, and is suitable for high current, big specification cable, protection The relay protection of multiple higher, capacity bigger uses, and product meets GB20840 and IEC186《Current transformer》Standard.
The beneficial effects of the utility model:A kind of open-type zero sequence current mutual inductor of the utility model, dielectric strength is high, Good mechanical property is suitable for high current, big specification cable, and multiple higher, the relay protection of capacity bigger is protected to use.
Description of the drawings
The utility model is further described with reference to the accompanying drawings and examples.
Fig. 1 is the sectional view of the utility model.
Fig. 2 is the utility model appearance diagram.
Fig. 3 is the utility model side view.
Specific implementation mode
The utility model is described in detail below with reference to attached drawing, such as Fig. 1, Fig. 2, shown in Fig. 3:The one of the present embodiment Kind of open-type zero sequence current mutual inductor comprising iron core 4 is wound with secondary line 5 on the iron core 4, is arranged on 4 periphery wall of iron core There are two semicircular epoxy package 3, it is fixedly connected by fixing bolt 6 between the epoxy package 3, wherein one The setting of the top of a epoxy package 3 is covered with secondary connection cover 2 there are two secondary bolt 1 outside two secondary bolts 1, another 3 top of a epoxy package is fixedly connected by pedestal fastening bolt 8 with mounting seat 7, one end of the secondary line 5 and two Secondary bolt 1 connects, and the other end is connect with secondary connection sheet 9, and the secondary connection sheet 9 is arranged between iron core 4.
The mounting seat 7 is several fonts.
The iron core 4 uses cold-reduced silicon sheet, anneals by winding.
The iron core 4 is cyclic structure.
Finally illustrate, above example is merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng The utility model is described in detail according to preferred embodiment, it will be understood by those of ordinary skill in the art that, it can be to this The technical solution of utility model is modified or replaced equivalently, without departing from the objective and model of technical solutions of the utility model It encloses, should all cover in the right of the utility model.

Claims (4)

1. a kind of open-type zero sequence current mutual inductor, it is characterised in that:Including iron core(4), the iron core(4)On be wound with it is secondary Line(5), iron core(4)There are two semicircular epoxy packages for setting on periphery wall(3), the epoxy package(3)It Between pass through fixing bolt(6)It is fixedly connected, one of epoxy package(3)There are two secondary bolts for top setting(1), two A secondary bolt(1)Outside is covered with secondary connection cover(2), another epoxy package(3)Top passes through pedestal fastening bolt (8)With mounting seat(7)It is fixedly connected, the secondary line(5)One end and secondary bolt(1)Connection, the other end and secondary company Contact pin(9)Connection, the secondary connection sheet(9)It is arranged in iron core(4)Between.
2. a kind of open-type zero sequence current mutual inductor according to claim 1, it is characterised in that:The mounting seat(7) For several fonts.
3. a kind of open-type zero sequence current mutual inductor according to claim 1, it is characterised in that:The iron core(4)Using Cold-reduced silicon sheet is annealed by winding.
4. a kind of open-type zero sequence current mutual inductor according to claim 1, it is characterised in that:The iron core(4)For ring Shape structure.
CN201721909128.5U 2017-12-30 2017-12-30 A kind of open-type zero sequence current mutual inductor Expired - Fee Related CN207925289U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721909128.5U CN207925289U (en) 2017-12-30 2017-12-30 A kind of open-type zero sequence current mutual inductor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721909128.5U CN207925289U (en) 2017-12-30 2017-12-30 A kind of open-type zero sequence current mutual inductor

Publications (1)

Publication Number Publication Date
CN207925289U true CN207925289U (en) 2018-09-28

Family

ID=63615799

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721909128.5U Expired - Fee Related CN207925289U (en) 2017-12-30 2017-12-30 A kind of open-type zero sequence current mutual inductor

Country Status (1)

Country Link
CN (1) CN207925289U (en)

Similar Documents

Publication Publication Date Title
CN103840437B (en) The quick diagnosis of power distribution network ferromagnetic resonance and singlephase earth fault and processing method
Chen et al. Analysis of multi-grounded four-wire distribution systems considering the neutral grounding
CN208571394U (en) A kind of photovoltaic power generation box-type substation based on intelligent controller
Nashawati et al. Impacts of shunt reactors on transmission line protection
CN102937687A (en) Method for distinguishing disconnection fault and grounding fault during grounding of neutral point through small resistor
CN110011285A (en) A kind of earthed system and method for high-voltage large-capacity flexible direct current engineering
Karppanen et al. Effect of voltage level selection on earthing and protection of LVDC distribution systems
AU2020247540B2 (en) Open pen detection and shut down system
CN201207564Y (en) Protection device for transformer earthing
CN207925289U (en) A kind of open-type zero sequence current mutual inductor
CN102969695B (en) Grounding forecasting method in neutral-point low-resistance grounding mode
Owen The historical development of neutral grounding practices
CN103560501A (en) Controlled type small-resistor arc extinction device and method
CN203883464U (en) Controllable small-resistor arc-extinguishing device
CN106158335A (en) A kind of three-phase resonance-eleminating type voltage inductor
CN106300289A (en) A kind of electric power line longitudinal coupling zero-sequenceprotection method of voltage compensation
CN108110737B (en) 6-10kV isolated neutral system casing zero sequence optical differential protective relaying device
Durham et al. Oilfield electric power distribution
CN207703991U (en) Medium voltage switchgear equipment energizing test equipment
CN206533138U (en) A kind of device of limitation 10kV distribution system capacitive earth currents
CN206040418U (en) Three -phase harmonic elimination formula voltage transformer
CN205509359U (en) Intelligent automatic supervision and control low pressure inlet wire switch board
CN201616628U (en) Distribution box for construction technology
CN109066714A (en) A kind of box distribution series compensation device and its working method
CN204008964U (en) A kind of for locating the signal injection device of earth fault

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20180928

Termination date: 20181230