CN2266184Y

CN2266184Y - Multipurpose current mutual-inductor

Info

Publication number: CN2266184Y
Application number: CN 95220528
Authority: CN
Inventors: 何排枝; 邹栈祥
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-08-18
Filing date: 1995-08-18
Publication date: 1997-10-29
Anticipated expiration: 2005-08-18

Abstract

The utility model relates to a 6 to 35KV metrology current mutual inductor. The middle part of a cylinder-shaped casing is embedded with a set of studs; the inner end of each stud contact closely with the periphery of a secondary iron core, and the secondary iron core is fixed; an epoxy resin or silicon rubber sealed insulating layer casts on the secondary iron core, a coil, and the studs; a set of arc-shaped spaces which are used to wind around a primary coil are arranged among the studs. A mutual inductor can change the transformation ratio between 4-16, achieving one machine with multiple purposes and stock of users reduction by 80 percents; large transformation ratio of protection and small transformation ratio of metering can be achieved in a same product, which is beyond the prior art in the old days, with accuracy up to 0.1, 0.2 S stage. The utility model can be installed in any direction, with small size.

Description

Many Current Transformer

The utility model relates to a kind of 6-35KV electric energy metrical Current Transformer.

Existing current transformer mostly is straight-through current transformer, the hole that this instrument transformer has only bus of a confession to use, and its variation has only three at most, and precision can only reach 0.2 grade, and volume is bigger.

The utility model purpose provides a kind of many Current Transformer of polytropic ratio.

The utility model comprises the secondary iron core, secondary coil and secondary connection post, it is characterized in that radially and pass overcoat and stud with one group of double-screw bolt with the cylindric overcoat middle part of epoxy resin or silicon rubber cast, the overcoat inner end of double-screw bolt with its on be wound with secondary coil annular secondary iron core periphery closely contact and iron core fixed, at the secondary iron core, be cast with one deck on the double-screw bolt in secondary coil and the overcoat equally and stud with the epoxy resin layer of the double-screw bolt that is used for fixing primary line or silastic-layer on it and form one group of arc space that is used for the coiling primary winding between double-screw bolt, the secondary connection post is set in cylindric overcoat middle part.

The utility model specific embodiment accompanying drawings is as follows:

Fig. 1, current transformer master cutaway view;

The left view of Fig. 2, Fig. 1;

Fig. 3, current transformer embodiment 2 main cutaway views;

The left view of Fig. 4, Fig. 3.

Embodiment 1,

As Fig. 1, shown in Figure 2, radially and pass overcoat and stud with one group as 3 double-screw bolts 1 with the middle part of the cylindric overcoat 2-1 of epoxy resin or silicon rubber cast, double-screw bolt outer end ground connection, inner end closely contacts with the periphery of the annular secondary iron core 5 that is wound with secondary coil 4 and iron core is fixed, at the secondary iron core, be cast with one deck on the double-screw bolt in secondary coil and the overcoat equally and stud with the epoxy resin layer or the silastic-layer 2-2 of two double-screw bolts 3 that are used for fixing primary line on it, and form the arc space that is used for the coiling primary winding 7 of one group of mutually insulated between double-screw bolt, secondary connection post 6 is set in the middle part of cylindric overcoat 2-1.During use, as required with primary winding in the iron core between centre bore and the arc space 7 and make once, two minor insulation, primary line is fixed on the double-screw bolt 3 and draws, all no-load voltage ratios realize between per two in 6 secondary connection posts 6.This example is suitable for the many Current Transformer of 6-10KV.

Embodiment 2,

This example is suitable for the many Current Transformer of 27.5KV, 35KV, for increasing creepage ratio apart from making the inner two ends of cylindric overcoat 2-1 stepped.As Fig. 3, Fig. 4, other structure is with example 1.

The utility model advantage: 1, can change no-load voltage ratio between 4～16, realize more than one With, reduce user 80% stock; 2, can in same product, realize the protection large velocity ratio (as 600/5) and the metering little no-load voltage ratio (such as 50/5), this is that transformer was unapproachable in the past; 3, The degree of accuracy brings up to 0.1, the 0.2S level; Can be arbitrarily angled when 4, installing, volume is little, installs Flexibly.

Claims

1, a kind of many Current Transformer, comprise the secondary iron core, secondary coil and secondary connection post, it is characterized in that radially and pass overcoat and stud with one group of double-screw bolt with the cylindric overcoat middle part of epoxy resin or silicon rubber cast, the overcoat inner end of double-screw bolt with its on be wound with secondary coil annular secondary iron core periphery closely contact and iron core fixed, at the secondary iron core, be cast with one deck on the double-screw bolt in secondary coil and the overcoat equally and stud with the epoxy resin layer of the double-screw bolt that is used for fixing primary line or silastic-layer on it and form one group of arc space that is used for the coiling primary winding between double-screw bolt, the secondary connection post is set in cylindric overcoat middle part.

2, instrument transformer according to claim 1 is characterized in that the inner two ends of cylindric overcoat are stepped.