CN202549601U - Electric photoelectric hybrid current transformer - Google Patents

Abstract

The utility model relates to an electric photoelectric hybrid current transformer which comprises a primary side current bus, a precise Rogowski coil, a magnetic shielding shell, a transformer sensing head, a signal processor, an optical fiber vibration sensor, a solenoid and a permanent magnet. The sensing head formed by the permanent magnet and the solenoid is a main basic part, the permanent magnet is of an annular structure, the solenoid is arranged in the center position of the permanent magnet, and a coil is arranged on the solenoid in a winding manner. The primary side current bus penetrates through the precise Rogowski coil and is connected with the precise Rogowski coil in identical potential, the precise Rogowski coil is connected to the transformer sensing head through a conducting wire, the magnetic shielding shell is arranged outside the transformer sensing head, the transformer sensing head is connected with the optical fiber vibration sensor, and the optical fiber vibration sensor is connected to the signal processor through optical fibers. The electric photoelectric hybrid current transformer can very accurately measure ultra-high current, has no need of internal insulation and magneto-optic glass, has no need of supplying power to the high-voltage end, and is resistant to high-current impact and stable in temperature performance. The electric photoelectric hybrid current transformer has the advantages of simple structure, convenience in operation, and safety and reliability.

Description

Electrodynamic type photoelectricity hybrid current instrument transformer

Technical field

The utility model relates to the photoelectric conversion device in High-Voltage Electrical Appliances and optical measurement field, relates in particular to electrodynamic type photoelectricity hybrid current instrument transformer.

Background technology

Continuous rising along with voltage class of electric power system; The interior insulation more and more difficult of tradition oil-immersed current transformer; And potentially take pains outer accident risk, and country's plan of proposing to build digital electrical network in recent years, make traditional oil-immersed current transformer more and more can not satisfy current demand; Though based on the optical current mutual inductor of magneto-optic Faraday effect is that multidisciplinary theory such as the fine sensing technology of a kind of light harvesting, photoelectric technology, nonlinear optics and advanced signal processing technology and application technology are in the new type current transformer in high voltage of one; With traditional high-voltage great-current instrument transformer compared with techniques; Advantages such as optical current mutual inductor has good, the no magnetic saturation of insulation property, range of dynamic measurement is big, anti-electromagnetic interference capability is strong; Become the new direction of current transformer of future generation; But the development of the optical current mutual inductor of prior art has run into temperature variant linear birefrigence has tremendous influence to testing result problem; And this influence can't be in system directly eliminates, and makes research and development run into bottleneck, and Many researchers has lost confidence to this; In addition, adopt and the equipotential Luo-coil current transformer of primary side,, make the reliability of instrument transformer and maintainability reduce, limited the popularization of this type of instrument transformer because signal demand is handled at primary side.Therefore need seek novel sensing measurement mode.

The utility model content

The purpose of the utility model is, overcomes the weak point of prior art instrument transformer, provides a kind of and need not do interior insulation, does not need magneto-optic glass, does not need the electrodynamic type photoelectricity hybrid current instrument transformer to the high-pressure side energy supply.

The said electrodynamic type photoelectricity of the utility model hybrid current instrument transformer includes primary side current bus, accurate Luo-coil, magnetic screen shell, instrument transformer sensing head, signal processor, optical fibre vibration sensor, solenoid and permanent magnet.The sensing head that permanent magnet and solenoid constitute is the subjective basis spare of the utility model, and permanent magnet is a loop configuration, and the middle position at permanent magnet is provided with solenoid, is provided with coil with the form of twining on the solenoid.The primary side current bus passes from accurate Luo-coil; And be connected with accurate Luo-coil is idiostatic; Accurate Luo-coil is wired to the instrument transformer sensing head; The outside of instrument transformer sensing head is provided with the magnetic screen shell, and the instrument transformer sensing head is connected with optical fibre vibration sensor, and optical fibre vibration sensor is connected to signal processor through optical fiber again.Solenoidal conventional electromagnetic current transducer of the utility model handle series connection is as primary sensing element; And place this solenoid the center of an annular permanent magnet; Secondary current in the conventional current instrument transformer produces and parallel magnetic field, magnetic field, permanent magnet center solenoid; Two magnetic field interactions make solenoid produce vibration; An optical fibre vibration sensor is used as the secondary sensing element, measures solenoidal vibration with it, the tested primary current of the final reflection of this vibration.Primary sensing element and primary side voltage are idiostatic, the Fibre Optical Sensor of secondary sensing element self good insulation preformance, so the electrodynamic type photoelectricity hybrid current instrument transformer of the utility model need not done interior insulation, shock resistance is good, and is simple in structure, reliable and stable.Accurate Luo-coil is enclosed within on the primary side current bus; Accurate Luo-coil links to each other with solenoid, and solenoid places the center of annular permanent magnet, and solenoid and annular permanent magnet place the magnetic screen shell; Solenoid links to each other with optical fibre vibration sensor, and optical fibre vibration sensor links to each other with signal processor.The utility model is surveyed the electromagnetic induction vibration of from current bus bar, being responded to the solenoid and the permanent magnet of the secondary side current generation that obtains by accurate Luo-coil with optical fibre vibration sensor, calculates the size of current in the primary side current bus of flowing through.

Evidence: the described electrodynamic type photoelectricity of the utility model hybrid current instrument transformer, not only can point-device measurement super-large current, and need not do interior insulation, and do not need magneto-optic glass, do not need to the high-pressure side energy supply, Chinese People's Anti-Japanese Military and Political College's rush of current, temperature performance is stable.The utlity model has simple in structure, easy to operate, good stability, characteristics such as safe and reliable can be widely used in super-large current and detect in the production practices.

Description of drawings

Accompanying drawing 1 is the principle structure sketch map of the said electrodynamic type photoelectricity of the utility model hybrid current instrument transformer; Accompanying drawing 2 is structural representations of permanent magnet and solenoid position.1-primary side current bus 2-accurate Luo-coil 3-magnetic screen shell 4-instrument transformer sensing head 5-signal processor 6-optical fibre vibration sensor 7-solenoid 8-permanent magnet.

Embodiment

Existing with reference to accompanying drawing 1 and accompanying drawing 2; Explain as follows in conjunction with embodiment: the said electrodynamic type photoelectricity of the utility model hybrid current instrument transformer includes primary side current bus 1, accurate Luo-coil 2, magnetic screen shell 3, instrument transformer sensing head 4, signal processor 5, optical fibre vibration sensor 6, solenoid 7 and permanent magnet 8.Permanent magnet 8 is subjective basis spares of the utility model with the instrument transformer sensing head 4 that solenoid 7 constitutes, and permanent magnet 8 is a loop configuration, in the middle position of permanent magnet 8, is provided with solenoid 7, is provided with coil with the form of twining on the solenoid 7.Primary side current bus 1 passes from accurate Luo-coil 2; And with accurate 2 idiostatic connections of Luo-coil; Accurate Luo-coil 2 is wired to instrument transformer sensing head 4; The outside of instrument transformer sensing head 4 is provided with magnetic screen shell 3, and instrument transformer sensing head 4 is connected with optical fibre vibration sensor 6, and optical fibre vibration sensor 6 is connected to signal processor 5 through optical fiber again.The conventional electromagnetic current transducer of a solenoid 7 of the utility model handle series connection is as primary sensing element; And place this solenoid 7 center of an annular permanent magnet 8; Secondary current in the conventional current instrument transformer produces and parallel magnetic field, magnetic field, permanent magnet center solenoid; Two magnetic field interactions make solenoid produce vibration; An optical fibre vibration sensor is used as the secondary sensing element, measures solenoidal vibration with it, the tested primary current of the final reflection of this vibration.Primary sensing element and primary side voltage are idiostatic, the Fibre Optical Sensor of secondary sensing element self good insulation preformance, so the electrodynamic type photoelectricity hybrid current instrument transformer of the utility model need not done interior insulation, shock resistance is good, and is simple in structure, reliable and stable.Accurate Luo-coil 2 is enclosed within on the primary side current bus 1; Accurate Luo-coil 2 links to each other with solenoid 7; Solenoid 7 places the center of annular permanent magnet 8; Solenoid 7 places magnetic screen shell 3 with annular permanent magnet 8, and solenoid 7 links to each other with optical fibre vibration sensor 6, and optical fibre vibration sensor 6 links to each other with signal processor 5.The utility model is surveyed the electromagnetic induction vibration of from current bus bar 1, being responded to the solenoid and the permanent magnet of the secondary side current generation that obtains by accurate Luo-coil 2 with optical fibre vibration sensor 6, calculates the size of current in the primary side current bus 1 of flowing through.Evidence: the described electrodynamic type photoelectricity of the utility model hybrid current instrument transformer, not only can point-device measurement super-large current, and need not do interior insulation, and do not need magneto-optic glass, do not need to the high-pressure side energy supply, Chinese People's Anti-Japanese Military and Political College's rush of current, temperature performance is stable.The utlity model has simple in structure, easy to operate, good stability, characteristics such as safe and reliable can be widely used in super-large current and detect in the production practices.

Claims (2)

1. electrodynamic type photoelectricity hybrid current instrument transformer; Include primary side current bus (1), accurate Luo-coil (2), magnetic screen shell (3), instrument transformer sensing head (4), signal processor (5), optical fibre vibration sensor (6), solenoid (7) and permanent magnet (8); Permanent magnet (8) is a subjective basis spare with the sensing head that solenoid (7) constitutes; It is characterized in that permanent magnet (8) is loop configuration; Middle position in permanent magnet (8) is provided with solenoid (7), and the form that solenoid (7) is gone up to twine is provided with coil; Primary side current bus (1) passes from accurate Luo-coil (2); And with idiostatic connection of accurate Luo-coil (2); Accurate Luo-coil (2) is wired to instrument transformer sensing head (4); The outside of instrument transformer sensing head (4) is provided with magnetic screen shell (3), and instrument transformer sensing head (4) is connected with optical fibre vibration sensor (6), and optical fibre vibration sensor (6) is connected to signal processor (5) through optical fiber again.

2. electrodynamic type photoelectricity hybrid current instrument transformer according to claim 1; It is characterized in that surveying the electromagnetic induction vibration of from current bus bar (1), responding to the solenoid and the permanent magnet of the secondary side current generation that obtains by accurate Luo-coil (2), calculate the size of current in the primary side current bus (1) of flowing through with optical fibre vibration sensor (6).

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