CN1681055B

CN1681055B - Current mutual inductor with hollow coil

Info

Publication number: CN1681055B
Application number: CN 200410079054
Authority: CN
Inventors: 陈汝清
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-09-27
Filing date: 2004-09-27
Publication date: 2012-05-09
Anticipated expiration: 2024-09-27
Also published as: CN1681055A

Abstract

The present invention provides a novel bobbinless coils current transformer which can distinguish energy conservation of the magnitude of current variation in electric power circuit. In insulating case, the second coil winding winds on the loop type plastic tubing support, iron core of silicon sheet is wound by secondary coil winding. The DC stabilized voltage supply is outputted by end three. Two coils are placed side by side and with same direction, and the DC stabilized voltage supply is arranged in the same insulating plastic case. After making electrical connection, it will be sealed with epoxy resin. When the first power bus-bars pass through the centre punche of the novel bobbinless coils current transformer which can distinguish energy conservation of the magnitude of current variation in electric power circuit, and a primary current passes through the power line, the secondary coil responds the corresponding magnitude of current, as well as the corresponding proportional voltage values is showed on the digital display type ac voltmeter of the high sensitivity 200 mV, thereby the aim to indicate a current of the electric power circuit is achieved.

Description

Current mutual inductor with hollow coil

Affiliated technical field

Patent of the present invention relates to the testing apparatus of current change in a kind of induction power circuit.Especially can discern the current mutual inductor with hollow coil of the current change in the power circuit.

Background technology:

At present, known current transformer structure be by: attach data, in the plastic casing by ring-like silicon sheet core, wrap in the outer insulating barrier of ring-like silicon sheet core, secondary enameled wire loops, secondary enameled wire loop binding post etc. outside insulating barrier are formed.No. one time power bus-bar is arranged the central hole through current transformer, and the secondary connection post connects indication and uses ammeter, and general work is controlled, protects, measured and use.After power line passes through primary current, sense the corresponding magnitude of current at secondary coil, on ammeter, show.When the current transformer of general big electrorheological ratio passes through rated current at a power line; Consumed power at the loaded line of secondary coil winding and ammeter will reach 5～40VA; The heating of current transformer; Make the power distribution cabinet and the instrument volume of assembling bigger, be unfavorable for the microminiaturization of instrument, standardization.The quality of silicon sheet core is fine or not simultaneously, and when primary current surpassed rated current, saturated phenomenon appearred in the electric current in the secondary load, and promptly when primary current continued to rise, secondary current was in saturation condition, directly influences the accuracy and the sensitivity of data.

Summary of the invention:

In order to overcome existing current transformer when big electrorheological compares; When current transformer passes through rated current at a power line; Make the instrument transformer heating in the consumed power of the loaded line of secondary coil winding and ammeter; Make the power distribution cabinet and the instrument volume of assembling bigger, be unfavorable for the microminiaturization of instrument, standardization.The quality of silicon sheet core is fine or not simultaneously, and when primary current surpassed rated current, saturated phenomenon appearred in the electric current in the secondary load, and promptly when primary current continued to rise, primary current was in saturation condition, directly influences the accuracy and the sensitivity of data.

Patent of the present invention solves the technical scheme that its technical problem adopted: in insulation crust; 1. by the secondary enameled wire loop that is wound with on the ring-like plastic pipe support, make secondary enameled wire loop winding; Two connector lugs are welded on respectively on two binding posts, and wherein a binding post connects an end of a 20K Ω standard resistor, a binding post of the digital display type A.C. voltmeter of another termination of resistance one high sensitivity 200mV; Another binding post of another binding post and secondary coil winding joins; After an electric power busbar passes the central hole of current mutual inductor with hollow coil, after power line passes through primary current, sense the corresponding magnitude of current at secondary coil; The magnitude of voltage that on the digital display type A.C. voltmeter of high sensitivity 200mV, shows corresponding proportion reaches the purpose of the electric current of a power circuit of indication.2. utilize conventional silicon sheet core coil current instrument transformer when primary current surpasses design current, saturated phenomenon appears in the electric current in the secondary load, promptly when primary current continues to rise; Secondary current is in the characteristic of saturation condition; Because general iron core all has coercive force to exist, thus the magnetic flux surge, behind the core sataration; Possibly in iron core, cause very big remanent magnetism; Before this remanent magnetism is not by the operating current degaussing, will make current transformer increase error, so cut a slit at ring-like silicon sheet core correct position; To improve magnetic structure; Eliminate remanent magnetism,, make secondary output current and volume controlled supply digital display type A.C. voltmeter or other to need the workplace of power supply at the fixing output of the three ends positive voltage integrated regulator D.C. regulated power supply of applicable technology claimed range through changing the various combination technique data and the technological process of silicon sheet core coil.Hollow coil and silicon sheet core coil are side by side, in the equidirectional plastic casing that is placed on same insulation, use epoxy encapsulation.

The beneficial effect of patent of the present invention is: can be when the test measured object is electric current; The defective and the deficiency of primary current instrument transformer have been improved;, simple in structure in the entire product structure only increasing the fixing output of three ends positive voltage integrated regulator D.C. regulated power supply on former two kinds of current transformer bases, when testing, increasing resistance and digital display type voltmeter.

Description of drawings:

Each embodiment further specifies patent of the present invention below in conjunction with accompanying drawing:

Fig. 1 is the vertical section structure circuit theory diagrams of conventional current instrument transformer.

Fig. 2 is the vertical section structure circuit theory diagrams of current mutual inductor with hollow coil.

Fig. 3 is the side sectional structural map of combination back product.

Fig. 4 is the vertical view of combination back product.

Fig. 5 is the circuit theory diagrams of the fixing output of three ends positive voltage integrated regulator D.C. regulated power supply.

Accompanying drawing is the measured data comparison diagram of two kinds of current transformers in addition.

1. power line perforation centers among Fig. 1, Fig. 2,2.3.8.9. secondary coil winding is drawn the end of a thread, 4. ring-like silicon sheet core; 5. the plastic casing that insulate; 6. wrap in the outer insulating barrier of silicon sheet core, the 10. ring-like plastic pipe support of hollow insulation, 7.11. secondary enameled wire loop; 12. top cover, 13. slits.

Embodiment:

Among Fig. 2; Be wound with on the ring-like plastic pipe support (10) in the inherent current mutual inductor with hollow coil of plastic casing (5) hollow coil secondary enameled wire loop (11), make secondary enameled wire loop winding; Two connector lugs of hollow coil scrape off enamelled coating and are welded on respectively on two binding posts (8.9); Wherein a binding post (8) connects an end of a 20K Ω standard resistor; One binding post of the digital display type A.C. voltmeter of another termination of resistance one high sensitivity 200mV, another binding post of the digital display type A.C. voltmeter of high sensitivity 200mV and another connector lug of secondary coil winding join; Utilize conventional silicon sheet core current transformer: plastic casing (5) inner ring type silicon sheet core (4), wrap in the outer insulating barrier (6) of silicon sheet core, secondary enamel-cover line chart (7), the secondary coil binding post (2.3) outer around insulation are connected on respectively on 2 inputs of four rectifier diodes (V, S), when primary current during above design current; Saturated phenomenon appears in the electric current in the secondary load; Promptly when primary current continued to rise, secondary current was in the characteristic of saturation condition, because general iron core all has coercive force to exist; So magnetic flux surge; Behind the core sataration, possibly in iron core, cause very big remanent magnetism, before this remanent magnetism is not by the operating current degaussing; To make current transformer increase error; So cut a slit at ring-like silicon sheet core correct position,, eliminate remanent magnetism to improve magnetic structure; Through changing the various combination technique data and the technological process of silicon sheet core coil, make secondary output current and volume controlled supply digital display type A.C. voltmeter or other to need the workplace of power supply at the fixing output of the three ends positive voltage integrated regulator D.C. regulated power supply of applicable technology claimed range; Hollow coil (10) and silicon sheet core coil (4) are side by side, in equidirectional plastic housing (5) body that is placed on same insulation, connect by figure and to use epoxy encapsulation after finishing.Pass the central hole of energy-conservation, novel current mutual inductor with hollow coil as power bus-bar row after; After power line passes through primary current; Sense the corresponding magnitude of current at secondary coil; The magnitude of voltage that on the digital display type A.C. voltmeter of high sensitivity 200mV, shows corresponding proportion reaches the purpose of the electric current of a power circuit of indication.

Claims

1. the current mutual inductor with hollow coil that can discern current change in the power circuit; Comprise: in insulation crust, on the ring-like plastic pipe support of hollow insulation, be wound with the secondary coil winding of enamelled wire, outer test circuit, the secondary enameled wire loop outside the silicon sheet core insulating barrier, the fixing output of three ends positive voltage integrated regulator D.C. regulated power supply; Described hollow coil and silicon sheet core coil side by side, in the equidirectional plastic casing that is placed on same insulation, two connector lugs of described secondary enameled wire loop on the ring-like plastic pipe support are connected with outer test circuit respectively; Two coils in the described secondary enameled wire loop outside ring-like silicon sheet core insulating barrier connect 2 inputs of four rectifier diodes (V, S) respectively; The input of the fixing output of output termination three ends of rectifier diode positive voltage integrated regulator; Form the needed D.C. regulated power supply of confession digital display type A.C. voltmeter, install and use epoxy encapsulation after connection finishes.

2. current mutual inductor with hollow coil according to claim 1 is characterized in that: the secondary coil of hollow coil is wound on the ring-like plastic pipe support of insulation.

3. current mutual inductor with hollow coil according to claim 1 is characterized in that: 200mV digital display type AC current-voltage table is installed in the instrument transformer top.

4. current mutual inductor with hollow coil according to claim 1 is characterized in that: cut a slit at the silicon sheet core correct position.