CN2872563Y

CN2872563Y - Energy-saving hollow-core coil current mutual inductor

Info

Publication number: CN2872563Y
Application number: CN 200320104526
Authority: CN
Inventors: 陈汝清
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-10-31
Filing date: 2003-10-31
Publication date: 2007-02-21
Anticipated expiration: 2013-10-31

Abstract

An energy-saving and novel type air core coil current mutual inductor capable of recognizing variation of magnitude of current in power circuit is provided. Inside the insulation housing, a secondary enameled wire is wound on the loop type plastics pipe bracket of core technical process; the two terminals are respectively welded on two terminal pillars after scraping off enameled coating and encapsulated by ethoxyline resin; the external test circuit is electronically connected to a first terminal pillar, a 20 K Omega standard resistor, a high-sensitive 200 mV digital-displaying AC voltmeter, and a second terminal pillar of the secondary coil in series; when the first power busbar passes through the centre hole of the energy-saving and novel type tubular coil current transformer and when the primary current passes through the electric line of force, the secondary coil will induce the corresponding magnitude of current, and the corresponding magnitude of voltage will be displayed on the high-sensitivity 200 mV digital-displaying AC voltmeter, so as to achieve the purpose of indicating the magnitude of current in power circuit for once.

Description

Energy-conservation, novel current mutual inductor with hollow coil

Affiliated technical field

The utility model patent relates to the testing apparatus of current change in a kind of induction power circuit.Energy-conservation, the novel current mutual inductor with hollow coil of the current change in especially can the identification circuit circuit.

Background technology:

At present, known current transformer structure by: in the plastic casing by the ring-like silicon sheet core of core technology technology, wrap in the outer insulating barrier of ring-like silicon sheet core, secondary enameled wire loops, secondary enameled wire loop two connector lug binding posts etc. outside insulating barrier are formed.Power bus-bar row is by the central hole of current transformer, and the secondary connection post connects the indication ammeter, generally does control, protection, measures usefulness.After power line passes through primary current, sense the corresponding magnitude of current at secondary coil, on ammeter, show.The current transformer of general big electrorheological ratio a power line during by rated current the consumed power at the loaded line of secondary coil winding and ammeter to 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 quality of silicon sheet core directly influences the accuracy and the sensitivity of data simultaneously.

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 quality of while silicon sheet core, 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.

The utility model patent solves the technical scheme that its technical problem adopts: in insulation crust, 1. by being wound with the secondary enameled wire loop on the ring-like plastic pipe support of core technology technology, making secondary enameled wire loop winding, two connector lugs scrape off enamelled coating and are welded on respectively on two binding posts, wherein a binding post 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 another binding post and secondary coil winding joins, be placed in the plastic casing of insulation, use epoxy encapsulation; Pass the central hole of energy-conservation, novel current mutual inductor with hollow coil when electric power busbar after, after power line passes through primary current, sense the corresponding magnitude of current at secondary coil, the magnitude of voltage that shows corresponding proportion on the digital display type A.C. voltmeter of high sensitivity 200mV reaches the purpose of the electric current of a power circuit of indication.

The beneficial effect of the utility model patent 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 when testing, increasing resistance and digital display type voltmeter on the primary current instrument transformer basis.

Description of drawings:

Each embodiment further specifies the utility model patent below in conjunction with accompanying drawing:

Fig. 1 is the vertical section core technology technical construction circuit theory diagrams of conventional current instrument transformer.

Fig. 2 is vertical section core technology technical construction circuit theory diagrams energy-conservation, novel current mutual inductor with hollow coil.

1.6 power lines perforation centers among Fig. 1 Fig. 2,2.3.7.8. secondary coil winding is drawn the end of a thread, and 4. ring-like silicon sheet core 5. wraps in the outer insulating barrier of silicon sheet core, the 9. ring-like plastic pipe support of hollow insulation, 10.11. secondary enameled wire loop.

Embodiment:

Among Fig. 2, be wound with secondary enameled wire loop (11) on the inherent core technology ring-like plastic pipe support of technology of plastic casing (9), make secondary enameled wire loop winding, two connector lugs scrape off enamelled coating and are welded on respectively on two binding posts (7.8), wherein a binding post (8) connects an end of a 20K Ω standard resistor, one electrode of the digital display type A.C. voltmeter of another termination of resistance one high sensitivity 200mV, another binding post (9) of another electrode of the digital display type A.C. voltmeter of high sensitivity 200mV and secondary coil winding joins.

Claims

1. the device that can discern current change in the power circuit---energy-conservation, novel current mutual inductor with hollow coil, in insulation crust, be wound with enamelled wire on the ring-like plastic pipe support of insulation, make the secondary coil winding, two connector lugs scrape off enamelled coating and are welded on respectively on two binding posts, electrical connection in order, it is characterized in that: two connector lugs of secondary enameled wire loop winding scrape off enamelled coating and are welded on respectively on two binding posts, and two binding post test contact electrodes are electrically connected with outer test circuit respectively.

2. energy-conservation, novel current mutual inductor with hollow coil according to claim 1 is characterized in that: be wound with enamelled wire on the ring-like plastic pipe support of insulation, make the secondary coil winding, two connector lugs scrape off enamelled coating and are welded on composition structure on two binding posts respectively.

3. energy-conservation, novel current mutual inductor with hollow coil according to claim 1, it is characterized in that: an electrode of the digital display type A.C. voltmeter of outer test circuit instrument high sensitivity 200mV connects a binding post, another electrode of the digital display type A.C. voltmeter of high sensitivity 200mV connects an end of a 20K Ω standard resistor, another binding post of another termination of 20K Ω standard resistor.