CN2350772Y - Magneto-optical current transformer - Google Patents
Magneto-optical current transformer Download PDFInfo
- Publication number
- CN2350772Y CN2350772Y CN 98233179 CN98233179U CN2350772Y CN 2350772 Y CN2350772 Y CN 2350772Y CN 98233179 CN98233179 CN 98233179 CN 98233179 U CN98233179 U CN 98233179U CN 2350772 Y CN2350772 Y CN 2350772Y
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- magneto
- utility
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- transform device
- sensitive apparatus
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measuring Magnetic Variables (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The utility model relates to a magnetooptical current transformer which is composed of a non-close type magnetooptical material sensitive device 1, an optics transformation device 2, a light source 3, a photoelectric transducing device 4, an amplifier shaping interface circuit 5 and a connecting optical fibre 6. The utility model has the advantages of small size, convenient installation, no oil and no iron core, the weight of the utility model is the one hundredth or even thousandth of the weight of the traditional transformers, and the utility model can be directly hung on a charge line and has no explosion danger and no magnetic resonance and saturation phenomenon.
Description
The utility model belongs to a kind of electric power mutual-inductor---and be a kind of brand-new magneto-opitcal current transducer.
Current transformer is electric system metering and the indispensable device of relay protection.Under high pressure and ultra-high pressure condition, present power department is the oil-filled induction current transformer (CT) of employing extensively, complies with his formation: just be filled with wet goods by coil, iron core, ceramic shell, inside and form, exposed many shortcomings.Mainly contain: oil-containing, so leakiness, explosive; Ferromagnetic resonance and magnetic saturation problem are arranged; Secondary circuit has out slightly dangerous, therefore needs relay protection device to protect CT itself; Weight is big, is generally the hundreds of kilogram to thousands of kilograms, and inconvenience is installed; Equipment such as electric parameters transducer need be added and just robotization can be realized.
In these years people are striving to find a kind of novel mutual inductor.Magneto-opitcal current transducer based on faraday magneto-optic effect has the advantage that traditional mutual inductor can't replace, both at home and abroad all in the research and development of engaging in magneto-opitcal current transducer (MOCT).Abroad, the hanging net operation experience in existing nearly ten years of the MOCT of ABB AB; Domestic also MOCT having been done partly worked, and obtained certain experience, and (" instrumental technique and sensor " 96 year 10 phase) publish.But, the problem of MOCT existence at present has: the mounting means in UHV (ultra-high voltage) is the same substantially with traditional CT, do not break through the thought of traditional CT on the structural design, and only be that coil with traditional CT changes magneto-optic memory technique into, magneto-optic memory technique forms closed circuit around lead.So just caused a series of problems: the lead heating is difficult to resolve determines, and magneto-optic memory technique is formed the uneven temperature field, causes magneto-optic memory technique to produce problems such as unbalanced stress, and then disadvantageous situation on some optics takes place, and the advantage of MOCT is weakened greatly; Magneto-optic memory technique is that MOCT installs inconvenience along the other problem that lead forms the closed circuit initiation, there is not too many difference with traditional CT, thus also have distance with the hope of applying unit, because the problems referred to above, make MOCT walk out the laboratory, reach practicability and seem particularly important.
The purpose of this utility model provides a kind of brand-new magneto-opitcal current transducer, makes it not only to have overcome existing variety of problems among the CT, and solves some problem that magneto-opitcal current transducer in the prior art can not satisfy practicability.
This purpose is to realize with following technical proposal: this magneto-opitcal current transducer, and he has a magneto-optic memory technique Sensitive Apparatus, is connected with the optical transform device thereon, and wherein one group of optical transform device is connected with light source by optical fiber; Another group optical transform device is connected with electrooptical device by another root optical fiber, electric signal after the conversion is delivered to and is amplified shaping and interface circuit, what particularly point out is, described magneto-optic memory technique Sensitive Apparatus is non-closo, promptly can be " u " font or " one " font, also can be other non-closo.The optical transform device is connected on its two ends respectively.
The advantage of this magneto-opitcal current transducer is: volume is little, in light weight, and weight only is more than percent even last per mille of traditional mutual inductor; Oil-containing does not have leakage of oil and explosion danger; Do not contain iron core, no magnetic resonance and saturated phenomenon; It is dangerous not have open circuit since in optical fiber transmission signals, so secondary circuit to the primary circuit without any influence; The magneto-optic memory technique Sensitive Apparatus of this mutual inductor is non-closo, so his general structure has solved difficult problem is installed in the prior art, and it is easy for installation, directly is articulated on the current-carrying conductor to get final product; Solved the problem that lead is difficult to dispel the heat in the prior art.Because of easily heat radiation, so avoid occurring uneven temperature field problem.This mutual inductor dynamic range is big, can (keep the favorable linearity characteristic in 1～25000A) in quite wide range of current; The measuring accuracy height satisfies IEC and GB standard.
Following accompanying drawing has provided embodiment of the present utility model:
Fig. 1 is the syndeton synoptic diagram that constitutes the utility model embodiment one.
Fig. 2 is the syndeton synoptic diagram that constitutes the utility model embodiment two.
Fig. 3 is embodiment one fundamental diagram in use.
Fig. 4 is embodiment two fundamental diagram in use.
In conjunction with the accompanying drawings structure of the present utility model and principle of work thereof are done further explanation:
Embodiment one realizes like this, as shown in Figure 1: this magneto-optic glass Sensitive Apparatus 1 is " u " type, its two ends are bonded with optical transform device 2, a specific light source 3 is arranged, join through one group of optical transform device 2 of optical fiber 6 with " u " type magneto-optic glass Sensitive Apparatus one end, wherein the optical transform device is by the self-focusing camera lens, and the polarizer constitutes.The optical transform device of " u " type magneto-optic glass Sensitive Apparatus other end is connected with electrooptical device 4 through another root optical fiber, and wherein this group optical transform device is to be made of analyzer, self-focusing camera lens.The output of electrooptical device 4 inserts amplifies shaping and interface circuit 5.
Embodiment two is achieved in that as shown in Figure 2: this magneto-optic glass Sensitive Apparatus 1 is " one " font, is bonded with optical transform device 2 respectively in two ends of " one " font, and the connection of other parts is the same with embodiment.
Light source among this embodiment is a light emitting diode that wavelength is 0.85 μ m, and optical fiber is to use twin fiber cable, and photoelectric commutator is photodetector and preamplifier circuit chip, and amplification filtering and shaping and interface circuit also adopt general-purpose chip.
The course of work of magneto-opitcal current transducer and principle: shown in Fig. 3,4: this magneto-opitcal current transducer is to be articulated on the current carrying conductor 7 when using.At this moment, drive wavelength for the light emitting diode of 0.85 μ m and a constant light source is provided by light intensity control control constant current source, light by an Optical Fiber Transmission in the twin fiber cable to the higher-pressure region (because current carrying conductor have electric current to pass through to produce magnetic field), the specific light of sending from light source becomes directional light through GRIN Lens, behind the polarizer, become linearly polarized light again, inject the magneto-optic glass Sensitive Apparatus, incident light is under the action of a magnetic field, plane of polarization will rotate, according to Faraday effect, the deflection angle of light changes with the difference of electric current, and then the light (being emergent light) that will reflect this variation is through entering another root Optical Fiber Transmission in the optical cable to photodetector and preamplifier chip through GRIN Lens again behind the analyzer, make light be converted to electric signal, deliver to amplification filtering and shaping chip then, after the interface circuit branch is given each user's use.
Claims (3)
1, a kind of magneto-opitcal current transducer, he has a magneto-optic memory technique Sensitive Apparatus (1), is connected with optical transform device (2) thereon, and wherein one group of optical transform device is connected with light source (3) by optical fiber; Another group optical transform device is connected with electrooptical device (4) by another root optical fiber, electrical signal converted is delivered to and is amplified shaping and interface circuit (5), it is characterized in that described magneto-optic memory technique Sensitive Apparatus (1) is non-closo, optical transform device (2) is connected on its two ends respectively.
2, magneto-opitcal current transducer according to claim 1 is characterized in that described non-closo magneto-optic memory technique Sensitive Apparatus (1) can be " one " font.
3, magneto-opitcal current transducer according to claim 1 is characterized in that described non-closo magneto-optic memory technique Sensitive Apparatus (1) can be " u " font.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98233179 CN2350772Y (en) | 1998-11-26 | 1998-11-26 | Magneto-optical current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98233179 CN2350772Y (en) | 1998-11-26 | 1998-11-26 | Magneto-optical current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2350772Y true CN2350772Y (en) | 1999-11-24 |
Family
ID=33981972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98233179 Expired - Fee Related CN2350772Y (en) | 1998-11-26 | 1998-11-26 | Magneto-optical current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2350772Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806824A (en) * | 2010-03-19 | 2010-08-18 | 浙江大学 | Current sensor based on magneto-optic nonreciprocal MZ interference structure |
| CN101563618B (en) * | 2006-12-12 | 2011-12-14 | Abb技术有限公司 | Time division multiplexed detector for a magneto-opitcal current transducer |
| CN102687025A (en) * | 2009-12-11 | 2012-09-19 | Abb技术有限公司 | Magneto optical current transducer with improved outage performance |
| CN101769999B (en) * | 2009-12-31 | 2013-02-13 | 上海舜宇海逸光电技术有限公司 | Optical fiber DC magneto-optic detection system and method |
| CN107402320A (en) * | 2017-07-06 | 2017-11-28 | 华中科技大学 | A kind of reflection-type intensity modulated multi-core fiber current sensing system |
-
1998
- 1998-11-26 CN CN 98233179 patent/CN2350772Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101563618B (en) * | 2006-12-12 | 2011-12-14 | Abb技术有限公司 | Time division multiplexed detector for a magneto-opitcal current transducer |
| CN102687025A (en) * | 2009-12-11 | 2012-09-19 | Abb技术有限公司 | Magneto optical current transducer with improved outage performance |
| CN102687025B (en) * | 2009-12-11 | 2015-07-29 | Abb技术有限公司 | There is the magneto optical current transducer improving power-off performance |
| CN101769999B (en) * | 2009-12-31 | 2013-02-13 | 上海舜宇海逸光电技术有限公司 | Optical fiber DC magneto-optic detection system and method |
| CN101806824A (en) * | 2010-03-19 | 2010-08-18 | 浙江大学 | Current sensor based on magneto-optic nonreciprocal MZ interference structure |
| CN101806824B (en) * | 2010-03-19 | 2012-01-25 | 浙江大学 | Current sensor based on magneto-optic nonreciprocal MZ interference structure |
| CN107402320A (en) * | 2017-07-06 | 2017-11-28 | 华中科技大学 | A kind of reflection-type intensity modulated multi-core fiber current sensing system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |