CN101256894B - Novel high voltage independent electronic type current mutual inductor - Google Patents
Novel high voltage independent electronic type current mutual inductor Download PDFInfo
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- CN101256894B CN101256894B CN2007101690907A CN200710169090A CN101256894B CN 101256894 B CN101256894 B CN 101256894B CN 2007101690907 A CN2007101690907 A CN 2007101690907A CN 200710169090 A CN200710169090 A CN 200710169090A CN 101256894 B CN101256894 B CN 101256894B
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Abstract
The present invention relates to high pressure independent electronic type current transformer, which includes a vertical type SF6 gas insulation current mutual-inductor, signal conditioning modulation circuit and direct current supply, conventional iron-core coil vertical type SF6 gas insulation current mutual-inductor is taken place by hollow coil or low power iron-core coil and hollow coil, and the current secondary winding is placed between inner layer and outer layer of double-layer earth screen barrel by using shielding structure of double-layer ground shield barrel, the output lead of current secondary winding connects with the signal input terminal of signal conditioning modulation circuit, the direct current supply connects with the power input terminal of signal conditioning modulation circuit. The present invention adopts SF6 as main insulation with simple insulation structure and high insulating intensity, and completely overcomes defect of electronic voltage mutual inductor to reduce cost greatly.
Description
Technical field
The present invention relates to a kind of novel high voltage independent electronic type current mutual inductor, be used for the current transformation under the open type transformer station high voltage environment, for measuring, protect and the monitoring use, this invention is applicable to 110kV and above high-voltage electric power system.
Background technology
Electronic current mutual inductor is different fully with traditional instrument transformer unshakable in one's determination because of its sensing principle, and has remarkable advantages.
From measuring principle classification, according to the IEC standard, electronic current mutual inductor has comprised 3 kinds of optical current mutual inductor (be called not only passive), air-core current transformer (but also being called Rogowski coil, active type) and low-power type current transformers.
The high voltage independent electronic type current mutual inductor general measure principle that is suitable for is at present: be protection passage sensing unit with the hollow coil; low-power sections core coil is for measuring the passage sensing unit; perhaps protect and measure passage and all adopt hollow coil; the semiconductor laser of low-pressure side is given on high-tension side modulation circuit power supply by energy supply optical fiber; convert the on high-tension side voltage signal that contains tested current information to digital signal driven for emitting lights diode; transfer to low-pressure side by signal transmission fiber with the form of light pulse, the active formula electronic current mutual inductor of just so-called light power supply.The shortcoming of the instrument transformer of this measurement structure is: the signal of telecommunication of on high-tension side measurement coil and the output of protection coil need be transformed into light pulse signal by the signal modulation circuit plate of high-pressure side work and transfer to low-pressure side from the high-pressure side, therefore must provide power supply to the circuit board of high-pressure side work.Be to adopt the supply power mode (being called for short little CT mode) of floated supply convertor to get energy at first from bus.But when bus current is very little, as be low to moderate 5% even 1% when following of rated current, supply convertor is not enough to keep normal energized condition, can't confess energy, may make the electronic mutual inductor can't operate as normal.The semiconductor laser that now generally is the employing low-pressure side is given on high-tension side modulation circuit power supply by energy supply optical fiber, but the power consumption of the modulation circuit that the most critical issue that exists at present is the high-pressure side works is excessive.The lowest power consumption that has reached is abroad greatly about about 30mW.The efficient of general opto-electronic conversion is 30%, this just requires the fiber power of semiconductor laser light source to reach more than the 100mW at least, and fiber power is at the light source of this order of magnitude, its life-span is shorter, can not satisfy the life requirements of electric power system far away to instrument transformer, the life-span of instrument transformer, general the requirement was 30 years, and its cost costliness.In addition, when being positioned on high-tension side electrooptical device long time continuous working, its conversion efficiency seriously decays.
In a word, this novel novel high voltage independent electronic type current mutual inductor subject matter is at present: need to adopt the signal condition modulation circuit plate power supply of the mode of light power supply to high-pressure side work, poor reliability costs an arm and a leg.
Summary of the invention
The invention provides a kind of novel high voltage independent electronic type current mutual inductor, overcome the defective of above-mentioned electronic current mutual inductor fully, electronic current mutual inductor adopts the insulation system of inverted gas insulated high voltage current transformer, make current measurement coil and signal modulation circuit plate all be positioned at earth potential, thereby can directly adopt the common power cable power supply, no longer need the light power supply, improved reliability greatly; In addition, the present invention utilizes the screen of the double-deck earth shield tube of internal layer, outer electrical communication as current transformer on the basis of the above, has overcome the influence of external environment factor, certainty of measurement height, good stability.
Novel high voltage independent electronic type current mutual inductor comprises an inverted SF
6Gas insulated high voltage current transformer, signal condition modulation circuit and DC power supply is characterized in that: with the inverted SF of hollow coil or hollow coil and the alternative conventional iron wire-core coil of low-power ironcore choke
6Gas insulated high voltage current transformer, hollow coil or hollow coil and low-power ironcore choke are positioned between the internal layer and skin of double-deck earth shield tube, wherein, the output lead of the electric current secondary winding of hollow coil or low-power ironcore choke is connected with the signal input part of signal condition modulation circuit, and DC power supply links to each other with the power input of signal condition modulation circuit.How much power of low-power ironcore choke is, clearly stipulates in the IEC standard, is the interior formulation of a kind of industry that everybody gives tacit consent to.
This novel high voltage independent electronic type current mutual inductor of the present invention comprises an inverted SF with hollow coil or low-power ironcore choke and the alternative conventional iron wire-core coil of hollow coil
6Gas insulated high voltage current transformer and be positioned at earthy signal condition modulation circuit and DC power supply.Concrete parts comprise secondary winding binding post, the SF on housing, insulating sleeve, lead-in wire shielded-plate tube, supporting insulator or disc insulator, Primary Conductor, electric current secondary winding, double-deck earth shield tube, rupture disk, base and the base
6Gas density controller, SF
6Inflation inlet and pipeline valve, signal condition modulation circuit, DC power supply is characterized in that:
1 this high voltage independent electronic type current mutual inductor comprises Primary Conductor and in the internal layer of double-deck earth shield tube and the secondary winding between the skin, this special double-deck earth shield structure can reduce the influence of extraneous distributed capacitance and stray capacitance greatly.
2 these high voltage independent electronic type current mutual inductor electric current secondary winding adopt hollow coil to substitute secondary winding unshakable in one's determination or adopt lower powered ironcore choke as current measurement; hollow coil is as protection; the output of hollow coil or lower powered ironcore choke are output as the secondary output signal of this current transformer, and the electric current secondary winding is positioned at earth potential.
The secondary singal output of 3 these high voltage independent electronic type current mutual inductors is transmitted in the lead-in wire shielded-plate tube of a ground connection, can reduce the influence of outside electromagnetic interference to transmission line greatly.
4 these high voltage independent electronic type current mutual inductors also comprise and are positioned at earthy signal condition modulation circuit and DC power supply, and DC power supply directly gives the power supply of signal condition modulation circuit with cable, no longer adopt light power supply or CT power supply.
The secondary singal of 5 these high voltage independent electronic type current mutual inductors exports the signal condition modulation circuit to, this circuit is arranged in double-deck earth shield tube, after signal transformation become digital optical signal, with transferring to the optical fiber connector that are fixed on the base downwards in the ground lead shielded-plate tube of optical fiber from insulated porcelain sleeve or synthetic insulator cover, this optical signal transmission maybe can be needed this current signal place to the control room with optical fiber or optical cable then.At this moment, the dc supply of this signal condition modulation circuit also is arranged in double-deck earth shield tube, and the available cable electrical power that DC power supply work is required transfers to the earth potential shielding cylinder from base by the ground lead shielded-plate tube insulated porcelain sleeve or the synthetic insulator cover.Thereby exempted the light power supply.
The secondary singal output of 6 these high voltage independent electronic type current mutual inductors also can be without conversion, directly with transferring to the secondary electric connecting terminals that is fixed on the base downwards in the ground lead shielded-plate tube of cable from insulated porcelain sleeve or synthetic insulator cover, again by the electric connecting terminals input signal conditioning modulation circuit on the base, at this moment, signal condition modulation circuit and dc supply all are positioned at SF
6Outside the air seal, not only exempt the light power supply, be more conducive to the maintenance and the maintenance of dc supply, signal condition modulation circuit.
The function of signal condition modulation circuit is: the signal input part that current transformer hollow coil secondary winding output signal of the present invention is input to the signal condition modulation circuit, again this current signal integration is amplified reduction, if the electric current secondary winding is the low-power ironcore choke, then only need to amplify.Then through becoming the digital light pulse signal after mould/transformation of variables and the light-to-current inversion, so that transfer to the follow up device place with optical fiber.
Particularly: the present invention has following technique effect:
1, the sensor coil of novel high voltage independent electronic type current mutual inductor of the present invention and signal condition modulation circuit all are positioned at earth potential, compare with present existing active electronic current transformer, do not need light power supply or CT power supply, improved reliability greatly, reduced cost.
2, novel high voltage independent electronic type current mutual inductor of the present invention adopts hollow coil as current measurement and protection, does not contain any iron core, can be unsaturated; Also can adopt lower powered ironcore choke as current measurement, hollow coil is protected, and the range of linearity of measurement is broad also.
3, novel high voltage independent electronic type current mutual inductor of the present invention, utilize the shielding construction of double-deck earth shield tube dexterously, the secondary winding hollow coil of current transformer or low-power ironcore choke and hollow coil are positioned between the internal layer and skin of double-deck earth shield tube, and this special double shield structure can reduce the influence of external electromagnetic field greatly.
Description of drawings
Fig. 1 is the general structure schematic diagram of novel high voltage independent electronic type current mutual inductor of the present invention.
Fig. 2 is another general structure schematic diagram of novel high voltage independent electronic type current mutual inductor of the present invention.
Embodiment
General structure of the present invention has adopted the structure of inverted gas insulated high voltage current transformer as shown in Figure 1.Electric current secondary winding 1 is placed in the double-deck earth shield tube 5 of double-deck earth shield tube internal layer 2 and outer 3 formations of double-deck earth shield tube, and be fixed on the housing 7 through supporting insulator 6, Primary Conductor 8 is flatly traversed electric current secondary winding 1 and is fixed on the housing 7, Primary Conductor 8 left ends and housing 7 are electrically connected, right-hand member insulate with housing 7 on electric through sealing ring and insulating case 9, the top of housing 7 also is equipped with rupture disk 4, can be used for discharging too high SF
6Air pressure; protection housing 7 and insulating sleeve 12; electric current secondary winding 1 in the double-deck earth shield tube 5 that is fixed on outer 3 formations of double-deck earth shield tube internal layer 2 and double-deck earth shield tube are drawn two leads (10; 11); these two leads (10,11) are formed this novel high voltage independent electronic type current mutual inductor secondary output sampled signal.Primary Conductor 8, electric current secondary winding 1, double-deck earth shield tube internal layer 2, double-deck earth shield tube outer 3 and housing 7 constitute this instrument transformer device body and place insulating sleeve 12 tops, and 12 of insulating sleeves are loaded on the base 13.The output lead of above-mentioned electric current secondary winding 1 (10,11) is drawn through base 13 and the secondary terminal sealed wiring dish 15 from base 13 down from lead-in wire shielded-plate tube 16.Double-deck earth shield tube internal layer 2 and double-deck earth shield tube outer 3 and lead-in wire shielded-plate tube 16 all are electrically connected by lead and the earth that passes lead-in wire shielded-plate tube 16 simultaneously.Be filled with SF in this structure of the present invention
6Gas 17,1 of Primary Conductor 8 and secondary winding are SF
6Gas-insulated.7 of the housings of secondary winding 1 and high potential are the supporting insulator 6 of poured with epoxy resin solid insulation, also can adopt disc insulator.Also be provided with SF on the base 13
6 Gas density controller 18, SF
6 Inflation inlet 19 and pipeline valve 20 etc. are used for inflation and monitor SF
6Gas density is used.
Signal condition modulation circuit 21 adopts electronic current mutual inductor signal condition modulation circuit commonly used on the existing market.DC power supply 22 is also bought from the market.
Signal condition modulation circuit 21 and DC power supply 22 all are positioned at SF among Fig. 1
6In the earth shield box 23 outside the air seal;
Signal condition modulation circuit 21 and DC power supply 22 are arranged in the double-deck earth shield tube 5 that double-deck earth shield tube constitutes among Fig. 2.
Electronic current mutual inductor secondary singal output of the present invention is directly with transferring to the electric wiring terminal that is fixed on the base 13 downwards in the ground lead shielded-plate tube 16 of cable from insulated porcelain sleeve 12 or synthetic insulator cover among Fig. 1, again by the electric wiring terminal input signal conditioning modulation circuit 21 on the base 13, at this moment and DC power supply 22 all be positioned at SF
6In the outer earth shield box 23 of air seal, this shielding box can be fixed on the base outer wall, and the input of the power supply of DC power supply 22 can be and exchanges or the direct current input, by cable 14 from the control room or the scene supply with on the spot.Not only exempt the light power supply, be more conducive to the maintenance and the maintenance of DC power supply 22, signal condition modulation circuit 21.
The secondary singal of current transformer of the present invention exports the signal condition modulation circuit 21 of electronic mutual inductor among Fig. 2, this circuit is arranged in the double-deck earth shield tube 5 of double-deck earth shield tube internal layer 2, outer 3 formations of double-deck earth shield tube, after signal transformation become digital optical signal, with transferring to the optical fiber connector 25 that are fixed on the base 7 downwards in the ground lead shielded-plate tube 16 of optical fiber 24 from insulated porcelain sleeve 12 or synthetic insulator cover 12, this optical signal transmission maybe can be needed this current signal place to the control room with optical fiber 24 or optical cable then.At this moment, the DC power supply 22 of this signal condition modulation circuit 21 also is arranged in double-deck earth shield tube 5, and the available cable 14 ground lead shielded-plate tube 16 of electrical power from base 7 overlaps by insulated porcelain sleeve 12 or synthetic insulator that DC power supply 22 work are required transfers to the input of the DC power supply 22 in the double-deck earth shield tube 5.Advantage is to exempt the light power supply, and the synchronous signal antijamming capability is very strong.
Claims (3)
1. high voltage independent electronic type current mutual inductor comprises an inverted SF
6Gas insulated high voltage current transformer, signal condition modulation circuit and DC power supply is characterized in that: substitute the conventional iron wire-core coil or with the inverted SF of low-power ironcore choke and the alternative conventional iron wire-core coil of hollow coil with hollow coil
6Gas insulated high voltage current transformer, air core coil or low-power ironcore choke and hollow coil are positioned over double-deck earth shield tube internal layer, between the double-deck earth shield tube skin, the output lead of the electric current secondary winding of hollow coil or low-power ironcore choke is connected with the signal input part of signal condition modulation circuit, DC power supply links to each other with the power input of signal condition modulation circuit, the electric current secondary winding is placed in the earth potential shielding cylinder of double-deck earth shield tube formation, and be fixed on the housing through supporting insulator or disc insulator, the Primary Conductor level is traversed the electric current secondary winding and is fixed on the housing, Primary Conductor one end and housing are electrically connected, the other end insulate with housing on electric through sealing ring and insulating case, the top of housing also is equipped with rupture disk, the electric current secondary winding is fixed in the double-deck earth shield tube, Primary Conductor, the electric current secondary winding, the internal layer of double-deck earth shield tube, skin and housing constitute instrument transformer device body and place the insulating sleeve top, the insulating case base is loaded on the base, the internal layer of double-deck earth shield tube, outer and lead-in wire shielded-plate tube all is electrically connected by lead and the earth, and signal condition modulation circuit and DC power supply are installed on SF
6In the earth shield box outside the air seal.
2. high voltage independent electronic type current mutual inductor comprises an inverted SF
6Gas insulated high voltage current transformer, signal condition modulation circuit and DC power supply is characterized in that: substitute the conventional iron wire-core coil or with the inverted SF of low-power ironcore choke and the alternative conventional iron wire-core coil of hollow coil with hollow coil
6Gas insulated high voltage current transformer, air core coil or low-power ironcore choke and hollow coil are positioned over double-deck earth shield tube internal layer, between the double-deck earth shield tube skin, the output lead of the electric current secondary winding of hollow coil or low-power ironcore choke is connected with the signal input part of signal condition modulation circuit, DC power supply links to each other with the power input of signal condition modulation circuit, the electric current secondary winding is placed in the earth potential shielding cylinder of double-deck earth shield tube formation, and be fixed on the housing through supporting insulator or disc insulator, the Primary Conductor level is traversed the electric current secondary winding and is fixed on the housing, Primary Conductor one end and housing are electrically connected, the other end insulate with housing on electric through sealing ring and insulating case, the top of housing also is equipped with rupture disk, the electric current secondary winding is fixed in the double-deck earth shield tube, Primary Conductor, the electric current secondary winding, the internal layer of double-deck earth shield tube, skin and housing constitute instrument transformer device body and place the insulating sleeve top, the insulating case base is loaded on the base, the internal layer of double-deck earth shield tube, outer and lead-in wire shielded-plate tube all is electrically connected by lead and the earth, signal condition modulation circuit and DC power supply are installed in the double-deck earth shield tube, the output of signal condition modulation circuit are drawn through base and the secondary terminal sealed wiring dish from base down from the lead-in wire shielded-plate tube by optical fiber again.
3. high voltage independent electronic type current mutual inductor according to claim 1 and 2 is characterized in that: be SF between Primary Conductor and secondary winding
6Gas-insulated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101690907A CN101256894B (en) | 2007-12-29 | 2007-12-29 | Novel high voltage independent electronic type current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101690907A CN101256894B (en) | 2007-12-29 | 2007-12-29 | Novel high voltage independent electronic type current mutual inductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101256894A CN101256894A (en) | 2008-09-03 |
| CN101256894B true CN101256894B (en) | 2011-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101690907A Withdrawn - After Issue CN101256894B (en) | 2007-12-29 | 2007-12-29 | Novel high voltage independent electronic type current mutual inductor |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616546B (en) * | 2013-11-19 | 2016-06-22 | 国家电网公司 | A kind of electronic current mutual inductor |
| DE102015214043A1 (en) * | 2015-07-24 | 2016-06-02 | Siemens Aktiengesellschaft | Zero flux current transformer |
| CN105225816A (en) * | 2015-10-21 | 2016-01-06 | 中国电力科学研究院 | A kind of current transformer with high voltage standard capacitor function |
| DE102015120319A1 (en) * | 2015-11-24 | 2017-05-24 | Phoenix Contact Gmbh & Co. Kg | Inductive current measuring transducer |
| CN105336474A (en) * | 2015-12-09 | 2016-02-17 | 天津市百利纽泰克电气科技有限公司 | Low-voltage current transformer based on hollow coil and low-power iron core coil |
| CN106093511B (en) * | 2016-08-26 | 2023-10-27 | 三峡大学 | High-precision electronic current transformer with iron core coil containing air gap |
| CN112611901A (en) * | 2020-12-03 | 2021-04-06 | 国网浙江省电力有限公司电力科学研究院 | Shielding device for current transformer end screen current test |
| CN114113737B (en) * | 2021-11-30 | 2023-05-23 | 江苏科兴电器有限公司 | 150kV zero-flux direct current transformer |
| CN116087866B (en) * | 2023-04-11 | 2023-07-28 | 山东泰开互感器有限公司 | Short-circuit resistance test system and method for secondary grounding system of current transformer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3380009A (en) * | 1967-03-10 | 1968-04-23 | Gen Electric | High voltage current transformer |
| DE19912503A1 (en) * | 1998-03-20 | 1999-09-23 | Abb Adda S P A | Current transformer with gas insulation |
| CN2775814Y (en) * | 2004-12-17 | 2006-04-26 | 华中科技大学 | Combined passive optical current/voltage mutual inductor |
| CN2836203Y (en) * | 2005-09-19 | 2006-11-08 | 王宇琼 | Combined transformer for metering |
| CN201134348Y (en) * | 2007-12-29 | 2008-10-15 | 武汉格蓝若光电互感器有限公司 | Novel high-voltage independent electronic current mutual inductor |
-
2007
- 2007-12-29 CN CN2007101690907A patent/CN101256894B/en not_active Withdrawn - After Issue
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3380009A (en) * | 1967-03-10 | 1968-04-23 | Gen Electric | High voltage current transformer |
| DE19912503A1 (en) * | 1998-03-20 | 1999-09-23 | Abb Adda S P A | Current transformer with gas insulation |
| CN2775814Y (en) * | 2004-12-17 | 2006-04-26 | 华中科技大学 | Combined passive optical current/voltage mutual inductor |
| CN2836203Y (en) * | 2005-09-19 | 2006-11-08 | 王宇琼 | Combined transformer for metering |
| CN201134348Y (en) * | 2007-12-29 | 2008-10-15 | 武汉格蓝若光电互感器有限公司 | Novel high-voltage independent electronic current mutual inductor |
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| CN101256894A (en) | 2008-09-03 |
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Effective date of registration: 20191031 Address after: 430074 room 1803-1805, building 2-07, optical valley core center, No. 303, optical valley Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: Wuhan Gelanruo Intelligent Technology Co., Ltd. Address before: 2 building, hi tech building, 18 Huaguang Road, East Lake Development Zone, Wuhan, Hubei, 430074 Patentee before: Wuhan Glory Optic-Electric Transformer Co., Ltd. |
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