CN2248914Y

CN2248914Y - High precision non-compensation mutual inductor

Info

Publication number: CN2248914Y
Application number: CN 95224569
Authority: CN
Inventors: 王焕文; 李京北; 黄宇宁
Original assignee: Central Iron and Steel Research Institute
Current assignee: Advanced Technology and Materials Co Ltd
Priority date: 1995-10-26
Filing date: 1995-10-26
Publication date: 1997-03-05
Anticipated expiration: 2005-10-26

Abstract

The utility model device discloses a high precision non-compensation mutual inductor which belongs to the commercial power system and instrument field, particularly suitable for non-compensation high precision miniature mutual inductors. The structure of the utility model is characterized in that an insulating protective sleeve is sheathed on a circular ring iron core of the utility model; an inner layer primary coil winding, a secondary coil winding, and an outer layer primary coil winding orderly wind on the insulating protective sleeve; an insulating shielding layer winds around each layer winding. The utility model has the advantages of reasonable and compact structure, small volume, no need of additional compensation, etc.

Description

The uncompensated instrument transformer of high accuracy

The utility model device belongs to industrial electric power system and instrument application.Be specially adapted to uncompensated high accuracy instrument transformer

Micro mutual inductor mainly is to be used for measuring control and relaying protection aspect in electric power system at present.Be to be used, enlarge electric current and voltage limit and measured circuit and isolate that the protection instrument is avoided overload damage etc. with measuring instrument in the laboratory.In the prior art at home, the most precision of the miniature electric current of widely applying on many power equipments and the measuring instrument, voltage transformer are not high, limited and measured and the accuracy of control.The instrument transformer that adopts the double-iron core magnetic compensation and adopt electronic circuit active compensation structure is also arranged in addition, and these instrument transformers have complex structure, and volume is big and the cost cost is high, make to use to be restricted.

The purpose of this utility model is to propose a kind of have service precision height and compact conformation, small-sized uncompensated voltage current transformer that volume is little.

The characteristics of the small-sized uncompensated instrument transformer that is proposed according to the utility model purpose, our designed high accuracy, single iron core, uncompensated, the concrete structure of small-sized instrument transformer can in detail tiltedly be stated as follows according to the utility model accompanying drawing.Accompanying drawing 1 is this instrument transformer appearance structure cross-sectional schematic.Accompanying drawing 2 is an instrument transformer section place internal structure schematic diagram.Accompanying drawing 3 is a current transformer wiring construction schematic diagram in parallel in the same way.Accompanying drawing 4 is a voltage transformer forward series wiring structural representation.In above-mentioned accompanying drawing: 1 is the transformer casing protective sleeve, and 2 is the current transformer body part, and 3 is the primary coil lead-out wire; 4 is the secondary coil lead-out wire; 5 is the screen lead-out wire, and 6 is ring structure iron core, and 7 is insulation protective jacket; 8a is an internal layer primary coil winding; 8b is the outer primary coil winding, and 9a is interior insulation screen, 9b, intermediate insulation screen; 9c is the outer layer insulation screen, and 10 is the secondary coil winding.

The composition of this instrument transformer is to be with insulation protective jacket 7 on the ring structure iron core 6 in shell protective sleeve 1; on insulation protective jacket 7; be wound with internal layer primary coil winding 8a along ring structure iron core 6 garden Zhou Yici; primary insulation screen 9a; secondary coil winding 10; intermediate insulation screen 9b, outer just coil windings 8b and external insulation screen 9c.In described in this instrument transformer, the composition of centre, external insulation screen 9a, 9b, 9c is insulating barrier-screen-insulating barrier; and all link, and draw shell protective sleeve 1 with screen lead-in wire 5 at the shielding winding lead-out wire in every layer of insulation screen middle level.According to above said content; be meant at the elementary winding, secondary winding and the insulation screen that are wound with different layers on the insulation protective jacket 7 successively ring structure iron core 6 is housed in insulation protective jacket 7; be wound with internal layer primary coil winding 8a at insulation protective jacket 7 outer surfaces; twine primary insulation screen 9a again in primary coil winding 8a periphery then; twining order is to twine insulating barrier earlier; around screen, twine insulating barrier at last more again.Secondary coil winding 10 is evenly to wind the line in the periphery of the primary insulation screen 9a that has wound, and two end lines and secondary coil lead-out wire 4 are linked.After secondary coil winding 10 wound, again around intermediate insulation screen 9b, canoe was identical with interior insulation screen 9a, i.e. insulating barrier-screen-insulating barrier.Outer primary coil winding 8b is the outer surface that is wrapped in intermediate insulation screen 9b, and winding mode is identical with internal layer primary coil winding 8a.Be wound with outer layer insulation screen 9c again at above-mentioned winding layer outer surface then, canoe is identical with 9a, 9b.The current transformer body that will assemble then partly 2 is put into transformer casing protective sleeve 1, and primary coil winding end line is all drawn 3 with primary coil and joined.The secondary coil winding all joins with secondary coil lead-out wire 4.The shielding conductor of every layer of insulation screen all joins with screen lead-out wire 5, and each lead-out

wire

3,4,5 is installed in the lower surface of the shell protective sleeve (1) of this instrument transformer.What provide in accompanying drawing 3 is current transformer primary coil winding connection schematic diagram, internal layer primary coil winding 8a in the accompanying drawings and outer primary coil winding 8b respectively get the primary coil total number of turns and do parallel connection in the same way, then two end lines are connected on the leg of primary coil lead-out wire 3.What accompanying drawing 4 provided is voltage transformer primary coil winding connection schematic diagram, internal layer primary coil winding 8a and outer primary coil winding 8b respectively get half of primary coil total number of turns and make the forward coupled in series, then two end lines are connected on the leg of primary coil lead-out wire 3.Voltage of the present utility model, current transformer are the structures that adopts secondary coil winding layers 10 always to be clipped between the adjacent primary coil winding, promptly has two-layer or two-layer above primary coil winding at least, the coupling that so just can guarantee instrument transformer is tight, and leakage inductance is little, withstand voltage reaching more than the 2KV.Behind the shielding layer grounding line, can make the parasitic capacitance that produces in this instrument transformer directly enter ground wire.Because reasonable in design, the compact conformation of this instrument transformer, so have service precision height (0.01-0.02 level) compared with prior art, characteristics such as volume is little, and is easy to use and need not compensate.

Claims

1; the uncompensated instrument transformer of a kind of high accuracy; the composition that it is characterized in that this instrument transformer is to be with insulation protective jacket (7) on the ring structure iron core (6) in transformer casing protective sleeve (1); ring-like garden Zhou Yici is wound with internal layer primary coil winding (8a) in insulation protective jacket (7) upper edge; primary insulation screen (9a); secondary coil winding (10); intermediate insulation screen (9b); outer primary coil winding (8b) and external insulation screen (9c); primary coil winding end line all joins with primary coil lead-out wire (3); the secondary coil winding all joins with secondary coil lead-out wire (4); every layer of insulation screen shielding conductor all joins with screen lead-out wire (5), and each lead-out wire is contained in the lower surface of this transformer casing protective sleeve (1).

2, according to the described instrument transformer of claim 1, it is characterized in that insulation screen (9a) (9b) composition of (9c) be insulating barrier-screen-insulating barrier.

3,, it is characterized in that being wound with on the ring structure iron core (6) two-layer or two-layer above primary coil winding according to the described instrument transformer of claim 1.

4,, it is characterized in that secondary coil winding (10) always is clipped between the adjacent primary coil winding according to the described instrument transformer of claim 1.

5,, it is characterized in that the internal layer primary coil winding (8a) of voltage transformer and outer primary coil winding (8b) all respectively get half of primary coil total number of turns and make the forward coupled in series according to claim 1,3 described instrument transformers.

6, according to claim 1,3 described instrument transformers, the internal layer primary coil winding (8a) that it is characterized in that current transformer and outer primary coil winding (8b) be each primary coil total number of turns and do parallel connection in the same way all.