CN201812667U - Electronic current and voltage combined transformer - Google Patents

Electronic current and voltage combined transformer Download PDF

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Publication number
CN201812667U
CN201812667U CN201020535143XU CN201020535143U CN201812667U CN 201812667 U CN201812667 U CN 201812667U CN 201020535143X U CN201020535143X U CN 201020535143XU CN 201020535143 U CN201020535143 U CN 201020535143U CN 201812667 U CN201812667 U CN 201812667U
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CN
China
Prior art keywords
tank body
transformer
voltage
sides
current
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 - Lifetime
Application number
CN201020535143XU
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Chinese (zh)
Inventor
罗苏南
张广泰
须雷
李九虎
陈松林
曹冬明
石亲民
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.)
NR Electric Co Ltd
Changzhou NR Electric Power Electronics Co Ltd
Original Assignee
NR Electric Co Ltd
Changzhou NR Electric Power Electronics Co Ltd
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Priority to CN201020535143XU priority Critical patent/CN201812667U/en
Application granted granted Critical
Publication of CN201812667U publication Critical patent/CN201812667U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model discloses an electronic current and voltage combined transformer, comprising a tank body, two air-core coils, two LPCTs (Late Proximal Cortical Tubule), two capacitance voltage dividing rings, a sealing terminal board, a far-end module, a box body, two adapter flanges, a primary conductor and two pot-shaped insulators. The tank body is provided with an opening, the air-core coils are respectively fixed at both sides of the tank body, the LPCTs are also respectively fixed at both sides of the tank body, the two capacitance voltage dividing rings are respectively arranged at the upper end and the lower end of the inner side of the tank body, the box body is fixed at the top of the tank body and forms a channel corresponding to the opening of the tank body, the sealing terminal board is arranged in the box body and blocks the opening of the tank body, the far-end module is also arranged at the outer side of the sealing terminal board in the tank body, the adapter flanges are respectively arranged at both sides of the tank body, the two pot-shaped insulators are respectively fixed at the end parts of the adapter flanges, and both ends of the primary conductor are respectively fixed with the two pot-shaped insulators and arranged between the two capacitance voltage dividing rings. The combined transformer can simultaneously have the functions of a current transformer and a voltage transformer and have high working reliability.

Description

A kind of electronic current voltage combination transformer
Technical field
The utility model belongs to power transmission and transforming equipment High-Voltage Electrical Appliances field; relate to a kind of high-tension electricity minor current/voltage combination transformer; relate in particular to the electronic current voltage combination transformer of a kind of 66kV of can be used for~750kV GIS (or HGIS), it is applicable to the GIS of 66kV, 110kV, 220kV, 330kV, 500kV and 750kV electric pressure electrical network or electric energy metrical, relaying protection and the electric quantity monitoring in the HGIS transformer station.
Background technology
GIS (Gas Insulated Switchgear, gas-insulated switch) be that the required elements of power transmission and transformation such as circuit breaker, isolating/grounding switch, current/voltage instrument transformer and bus are sealed in high pressure combined electrical apparatus in the gas-insulated metal shell, HGIS (Hybrid Gas Insulated Switchgear) is a kind of high voltage switchgear between GIS and AIS, and GIS and HGIS have characteristics such as compact conformation, floor space be little, easy for installation, reliable, non-maintaining.At present, current transformer that uses among GIS and the HGIS and voltage transformer all are electromagnetic transformers, and along with the raising of electric pressure, electromagnetic current transducer and voltage transformer are embodied in because of its inherent shortcoming can not adapt to power system development:
(1) manufacture difficulty of electromagnetic transformer, technology, cost, volume and weight can form along with the raising of electric pressure doubly increases, and insulation characterisitic is bad, the ability of tolerance lightning impulse voltage and operating impulse voltage;
(2) the non-linear dynamic range of current transformer that causes of magnetization curve unshakable in one's determination is little, and particularly contain under the fault current effect of attenuating dc component current transformer at big electric current easily saturated;
(3) ferro resonance easily takes place in voltage transformer;
(4) Current Transformer Secondary open circuit and voltage transformer secondary short circuit all can bring harm to equipment and personnel;
(5) error of instrument transformer is relevant with load, and load variations may cause the error of instrument transformer overproof;
(6) current transformer and voltage transformer can not be combined into one, and use dumb;
(7) output of electromagnetic transformer can not be directly and digitlization secondary device interface, can not adapt to the demand of digital transformer substation development.
Use based on the existing engineering of the GIS electronic current mutual inductor of hollow coil and LPCT at present, but the mode that the GIS electronic type voltage transformer still adopts conventional voltage transformer to add data acquisition on the spot realizes, shortcomings such as ferro resonance easily take place this kind mode can not to solve conventional voltage transformer on the one hand, and can not realize the current/voltage combined instrument transformer, can not adapt to the growth requirement of digital transformer substation.
Based on aforementioned analysis, the design people is devoted to develop a kind of current/voltage combined instrument transformer structure, and this case produces thus.
The utility model content
Main purpose of the present utility model is to provide a kind of electronic current voltage combination transformer, can have the function of current transformer and voltage transformer simultaneously, and the functional reliability height.
In order to reach above-mentioned purpose, solution of the present utility model is:
A kind of electronic current voltage combination transformer comprises a tank body, two hollow coils, two LPCT, two capacitance partial pressure rings, a sealed end daughter board, a remote end module, a casing, two switching flange, a Primary Conductor and two disc insulators; Wherein, tank body has an opening, is used for sensing and protects the both sides that are individually fixed in tank body with the hollow coil of current signal, is used for sensing measurement also is individually fixed in tank body with the LPCT of current signal both sides; Two capacitance partial pressure rings are located at the two ends up and down of tank body inboard respectively; Casing is fixed in the tank body top, and the passage of the opening of corresponding tank body formation up/down perforation, and the sealed end daughter board is located at the channel position in the casing, and the opening of tank body is blocked, and remote end module also is located in the casing, and is positioned at the outside of sealed end daughter board; Two switching flanges are located at the both sides of tank body respectively, and the end of the flange of respectively transferring also fixes a disc insulator respectively, and the two ends of Primary Conductor are fixed with two disc insulators respectively, and described Primary Conductor is between two capacitance partial pressure rings.
The left and right sides of above-mentioned tank body forms rectangular channel respectively, and hollow coil and LPCT all are fixed in this rectangular channel.
After adopting such scheme, the utlity model has following characteristics:
(1) the utility model utilizes hollow coil and LPCT sensing primary current, utilize coaxial capacitance voltage divider sensing primary voltage, utilize remote end module to gather the current/voltage signal of sensor nearby, utilize optical fiber transmission signal, structure and technology are simple, cost is low, and volume and weight has only 1/4 of conventional current/voltage transformer;
(2) main insulation is the SF6 gas medium, and stable insulation also can be recovered, and insulation margin is big, has greatly improved the security reliability of electrical network;
(3) remote end module places in the shielding case body on the tank body, and the current/voltage signal of sensor causes remote end module by the metal sealing terminal plate of band glass sintering aviation plug, and the influence of electromagnetic interference and VFTO is effectively suppressed;
(4) adopt LPCT sensing measurement current signal, the technology that adopts hollow coil to add the hardware integration realizes the detection of protection with current signal, the precision height of current transformer (satisfying the 0.2S level requires), temperature stability good (can-40 ℃~+ 75 ℃ temperature range operate as normal) and have good transient characterisitics (transient error is less than 2%);
(5) technology that adopts capacitance-resistance differential voltage transducer and software and hardware integration to combine realizes once high-tension measurement, voltage measurement precision height (satisfy 0.2 grade of requirement), temperature stability good (can-40 ℃~+ 75 ℃ temperature range operate as normal), and have good transient characterisitics;
(6) dualization of current/voltage transducer redundant configuration, and the analog signal of each transducer output all adopted dualization sampling comparison techniques having avoided sampling to cause the problem of protection malfunction, reliability height unusually.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Fig. 1 is an assembled sectional view of the present utility model;
Fig. 2 is an end view of the present utility model.
Embodiment
Below with reference to drawings and the specific embodiments, structure of the present utility model and operation principle are elaborated.
Cooperate shown in Figure 1, the utility model provides a kind of electronic current voltage combination transformer, comprise a tank body 1, two hollow coils 2, two 3, two capacitance partial pressure rings 4 of LPCT (low-power current transformer), sealed end daughter board 5, remote end module 6, casing 7, two switching flanges 8, Primary Conductor 9 and two disc insulators 10, introduce respectively below.
The inside of tank body 1 has an air chamber 11, and the top has a connection air chamber 11 and outside opening 12, and each side is being provided with a rectangular channel 13.
Two hollow coils 2 are individually fixed in two rectangular channels 13 of tank body 1; described hollow coil 2 is used for sensing protection current signal; the output signal of this hollow coil 2 is differential of tested electric current; the differential signal that adopts the hardware Integral Technology that hollow coil 2 is exported carries out integral transformation; can make the protective current signal of LPCT 3 have bigger dynamic range and transient characterisitics preferably like this, satisfy the demand of relaying protection.
Two LPCT 3 are individually fixed in two rectangular channels 13 of tank body 1, and described LPCT 3 is used for the sensing measurement current signal, can make it measure current signal like this and have higher accuracy of measurement, satisfy the demand of electric energy metrical.
Two capacitance partial pressure rings 4 utilize dielectric to be individually fixed in tank body 1 inboard, and in the present embodiment, two capacitance partial pressure rings 4 are located at the two ends up and down of tank body 1 respectively.
Open top 12 places of tank body 1 are fixed with a casing 7, cooperate shown in Figure 2ly, and this casing 7 can be used for shielding external interference signals, and the opening 12 of corresponding tank body 1 has the passage of up/down perforation.
Sealed end daughter board 5 is a metal material, and has a glass sintering aviation plug, described sealed end daughter board 5 is fixed on the passage in the casing 7, and opening 12 positions of corresponding tank body 1, output signal with hollow coil 2, LPCT 3 and capacitance partial pressure ring 4 causes outside the air chamber 11 on the one hand, is used for the gas in the sealed air chamber 11 on the other hand; Owing to can produce transient overvoltage (VFTO) when GIS circuit breaker or isolator operation, therefore adopt sealed end daughter board 5 can prevent the interference of VFTO effectively to remote end module 6.
The both sides of tank body 1 are respectively equipped with a switching flange 8, and the end of two switching flanges 8 also is fixed with a disc insulator 10 respectively, the two ends of cylindrical Primary Conductor 9 are fixing with two disc insulators 10 respectively, and make Primary Conductor 9 between two capacitance partial pressure rings 4, like this, two capacitance partial pressure rings 4 are all between Primary Conductor 9 and tank body 1, capacitance partial pressure ring 4 constitutes high-voltage capacitance C1 with Primary Conductor 9, the medium of this high-voltage capacitance is a SF6 gas, and capacitance partial pressure ring 4 constitutes low-voltage capacitance C2 with tank body 1, and the appearance value of this low-voltage capacitance is subject to the influence of output signal line distributed capacitance; For stability and the transient performance that improves voltage measurement, at the two ends of aforementioned low-voltage capacitance and meet the little resistance precision resistance R (this resistance is located in the remote end module 6) that a temperature coefficient is 5ppm, the resistance of described resistance is much smaller than the capacitive reactance of low-voltage capacitance The signal that is obtained by the resistance two ends is the differential of tested primary voltage Utilize remote end module 6 that it is carried out the information that integral transformation just can be known primary voltage.
Remote end module 6 also is located in the casing 7, and is fixed in the outside of sealed end daughter board 5.
During work, hollow coil 2 and LPCT 3 are used for the tested primary current information of sensing, wherein, and the protection of hollow coil 2 sensings current signal, LPCT 3 sensing measurement current signals; And the tank body 1 of each capacitance partial pressure ring 4 and both sides, Primary Conductor 9 constitutes a coaxial capacitance voltage divider, and two capacitance partial pressure rings 4 are respectively the targets of these two coaxial capacitance voltage dividers, this coaxial capacitance voltage divider is used for the tested primary voltage information of sensing, remote end module 6 in-site collectings are also handled hollow coil 2, the output signal of LPCT 3 and coaxial capacitance voltage divider, each analog input signal remote end module is all designed two-way independent sample loop, finish dualization sampling, in real time relatively, verification two-way sampled value, realize sampling circuit hardware check function, avoid sampling to cause the protection malfunction unusually; And the output signal of remote end module 6 is a digital signal, and this output signal is utilized Optical Fiber Transmission.
Need to prove, the utility model disposes two cover hollow coils 2, LPCT 3, coaxial capacitance voltage divider and remote end module 6 altogether, two cover measuring components are standby each other, and wherein the fault of a cover measuring component can not influence the operate as normal of another set of measuring component, thereby has higher reliability.
Above embodiment only is explanation technological thought of the present utility model; can not limit protection range of the present utility model with this; every according to the technological thought that the utility model proposes, any change of being done on the technical scheme basis all falls within the utility model protection range.

Claims (2)

1. an electronic current voltage combination transformer is characterized in that: comprise a tank body (1), two hollow coils (2), two LPCT (3), two capacitance partial pressure rings (4), a sealed end daughter board (5), two remote end modules (6), a casing (7), two switchings flange (8), a Primary Conductor (9) and two disc insulators (10); Wherein, tank body (1) has an opening (12), is used for sensing and protects the both sides that are individually fixed in tank body (1) with the hollow coil (2) of current signal, is used for sensing measurement also is individually fixed in tank body (1) with the LPCT (3) of current signal both sides; Two capacitance partial pressure rings (4) are located at the inboard two ends up and down of tank body (1) respectively; Casing (7) is fixed in tank body (1) top, and the opening of corresponding tank body (1) forms the passage of up/down perforation, and sealed end daughter board (5) is located at the channel position in the casing (7), and the opening (12) of tank body (1) blocked, remote end module (6) also is located in the casing (7), and is positioned at the outside of sealed end daughter board (5); Two switching flanges (8) are located at the both sides of tank body (1) respectively, and the end of the flange (8) of respectively transferring is also fixed a disc insulator (10) respectively, the two ends of Primary Conductor (9) are fixing with two disc insulators (10) respectively, and described Primary Conductor (9) is positioned between two capacitance partial pressure rings (4).
2. a kind of electronic current voltage combination transformer as claimed in claim 1, it is characterized in that: the left and right sides of described tank body (1) forms rectangular channel (13) respectively, and hollow coil (2) and LPCT (3) all are fixed in this rectangular channel (13).
CN201020535143XU 2010-09-16 2010-09-16 Electronic current and voltage combined transformer Expired - Lifetime CN201812667U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201020535143XU CN201812667U (en) 2010-09-16 2010-09-16 Electronic current and voltage combined transformer

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102496447A (en) * 2011-12-01 2012-06-13 中国西电电气股份有限公司 Electronic single-phase current voltage transformer for gas insulated metal-closed switchgear
CN102737826A (en) * 2012-06-05 2012-10-17 平高集团有限公司 Mutual inductor
CN102914680A (en) * 2011-09-26 2013-02-06 北京航天时代光电科技有限公司 Optical voltage transformer integrated in GIS cavity
CN103208360A (en) * 2013-03-21 2013-07-17 许继集团有限公司 Electronic-type current-voltage-combined transformer for GIS (gas insulated switchgear)
CN103208359A (en) * 2013-03-21 2013-07-17 许继集团有限公司 Electronic current and voltage combined transformer for support column type gas insulation
CN103545102A (en) * 2013-10-22 2014-01-29 江苏靖江互感器厂有限公司 Outdoor integral intelligent combined transformer
CN103730247A (en) * 2013-12-17 2014-04-16 国家电网公司 Full-shielding high-voltage isolated-type voltage transformer
CN105489361A (en) * 2015-12-04 2016-04-13 国家电网公司 Electronic current-voltage combined transducer for GIS
CN105575637A (en) * 2015-12-23 2016-05-11 四方继保(武汉)软件有限公司 Gas insulated switchgear (GIS) electronic type voltage transformer with suspension plate electrode structure
CN106501568A (en) * 2016-12-23 2017-03-15 中国西电电气股份有限公司 A kind of divider remote end module casing
CN110850137A (en) * 2018-08-21 2020-02-28 西安西电高压开关有限责任公司 Electronic transformer and data processing method
CN112449677A (en) * 2018-11-20 2021-03-05 Abb瑞士股份有限公司 Device for monitoring the temperature and voltage of a cable joint of a cable connected to a gas-insulated switchgear and associated manufacturing method

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102914680A (en) * 2011-09-26 2013-02-06 北京航天时代光电科技有限公司 Optical voltage transformer integrated in GIS cavity
CN102914680B (en) * 2011-09-26 2013-06-19 北京航天时代光电科技有限公司 Optical voltage transformer integrated in GIS cavity
CN102496447B (en) * 2011-12-01 2015-04-22 中国西电电气股份有限公司 Electronic single-phase current voltage transformer for gas insulated metal-closed switchgear
CN102496447A (en) * 2011-12-01 2012-06-13 中国西电电气股份有限公司 Electronic single-phase current voltage transformer for gas insulated metal-closed switchgear
CN102737826A (en) * 2012-06-05 2012-10-17 平高集团有限公司 Mutual inductor
CN102737826B (en) * 2012-06-05 2014-03-12 平高集团有限公司 Mutual inductor
CN103208360B (en) * 2013-03-21 2016-04-20 许继集团有限公司 A kind of GIS electronic current-voltage combination transformer
CN103208360A (en) * 2013-03-21 2013-07-17 许继集团有限公司 Electronic-type current-voltage-combined transformer for GIS (gas insulated switchgear)
CN103208359A (en) * 2013-03-21 2013-07-17 许继集团有限公司 Electronic current and voltage combined transformer for support column type gas insulation
CN103208359B (en) * 2013-03-21 2016-04-20 许继集团有限公司 A kind of column support type gas-insulated electronic current-voltage combination transformer
CN103545102A (en) * 2013-10-22 2014-01-29 江苏靖江互感器厂有限公司 Outdoor integral intelligent combined transformer
WO2015090119A1 (en) * 2013-12-17 2015-06-25 国家电网公司 Full-shielding high-voltage isolated-type voltage transformer
CN103730247B (en) * 2013-12-17 2016-04-20 国家电网公司 A kind of full-shield high_voltage isolation type voltage transformer
CN103730247A (en) * 2013-12-17 2014-04-16 国家电网公司 Full-shielding high-voltage isolated-type voltage transformer
CN105489361A (en) * 2015-12-04 2016-04-13 国家电网公司 Electronic current-voltage combined transducer for GIS
CN105489361B (en) * 2015-12-04 2018-08-03 国家电网公司 GIS electronic current-voltage combination transformers
CN105575637A (en) * 2015-12-23 2016-05-11 四方继保(武汉)软件有限公司 Gas insulated switchgear (GIS) electronic type voltage transformer with suspension plate electrode structure
CN105575637B (en) * 2015-12-23 2017-11-24 四方继保(武汉)软件有限公司 A kind of GIS electronic type voltage transformers of suspension plate electrode structures
CN106501568A (en) * 2016-12-23 2017-03-15 中国西电电气股份有限公司 A kind of divider remote end module casing
CN110850137A (en) * 2018-08-21 2020-02-28 西安西电高压开关有限责任公司 Electronic transformer and data processing method
CN110850137B (en) * 2018-08-21 2022-07-12 西安西电高压开关有限责任公司 Electronic transformer and data processing method
CN112449677A (en) * 2018-11-20 2021-03-05 Abb瑞士股份有限公司 Device for monitoring the temperature and voltage of a cable joint of a cable connected to a gas-insulated switchgear and associated manufacturing method

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Granted publication date: 20110427