CN201503765U

CN201503765U - Through type low-tension current mutual inductor

Info

Publication number: CN201503765U
Application number: CN2009201948947U
Authority: CN
Inventors: 何排枝
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-09-11
Filing date: 2009-09-11
Publication date: 2010-06-09
Anticipated expiration: 2019-09-11

Abstract

The utility model discloses a through type low-tension current mutual inductor comprising a mounting plate and an insulation casing fixed on the mounting plate, wherein, a threading hole for a primary coil to be tested to pass through is formed at the middle part of the insulation coil, a plurality of ring-shaped iron cores wound with secondary coils respectively are arranged inside the insulation casing, the ring-shaped iron cores are arranged sequentially and independently along the direction of the threading hole, the respective secondary coils on the ring-shaped iron cores are connected in series in such a manner that a secondary outlet wire end is formed at the head end of the secondary coil on the first ring-shaped iron core and another secondary outlet wire end is formed at the tail end of the secondary coil of the last ring-shaped iron core, and secondary outlet wire bolts connected respectively with the two secondary outlet wire ends are arranged at the top of the insulation casing. The utility model aims to provide a through type low-tension current mutual inductor, which is high on precision, large on capacity and good at preventing electricity stealing.

Description

The punching low-voltage current mutual inductor

[technical field]

The utility model relates to the punching low-voltage current mutual inductor.

[background technology]

Existing punching low-voltage current mutual inductor generally is to coil on the iron core of a magnetic, thereby obtain needed rank and capacity, rank is 0.2 grade or 0.5S level 10VA, as long as single iron core is just passable, yet single iron core coiling is often when ratio is 1%, just do not met the requirement of 0.2S level, when requiring like this to produce the product of 10VA 0.2S level, single iron core be the requirement that is difficult to meet 10VA 0.2S level, so the precision of the instrument transformer of existing single iron core is not high.

In addition, the capping of existing transformer is easy to be turned down or reaches the purpose of power stealing by hcl corrosion, and is therefore, anti-electricity-theft poor.

[utility model content]

The utility model has overcome the deficiency of above-mentioned technology, and a kind of precision height, capacity is big, power-steeling preventing effect is good punching low-voltage current mutual inductor are provided.

For achieving the above object, the utility model has adopted following technical proposal:

The utility model is the punching low-voltage current mutual inductor, include mounting panel, be fixed on the insulation crust on the mounting panel, be provided with the through wires hole that passes for tested primary winding at the insulation crust middle part, a plurality of annular cores that are tied with secondary coil respectively are set in insulation crust, these annular cores are spaced apart successively along the through wires hole direction, secondary coil on each annular core is cascaded successively, make the head end of the secondary coil on first annular core form a secondary leading-out terminal, the tail end of the secondary coil on last annular core forms another secondary leading-out terminal; Be provided with the secondary that is connected connection respectively with two secondary leading-out terminals at the insulation crust top and bolt occurs.

Insulation crust is provided with boss, has two antitheft electric wiring holes that run through in boss side surfaces.

Described annular core is two or more.The secondary coil after the series connection and the no-load voltage ratio of tested primary winding are 50/5 or 60/5 or 75/5 or 100/5 or 150/5.

The beneficial effects of the utility model are: 1, the utility model adopts a plurality of iron cores, and the secondary coil on a plurality of iron cores connected, the precision of instrument transformer can be brought up to more than 6/10000ths like this, precision grade can be 0.1S, 0.2S, 0.5S, make the capacity of instrument transformer increase by 15%, angular difference reduces ± 5 fens, and ratio reduces ± 2/100, and the secondary coil after the series connection and the no-load voltage ratio of tested primary winding can be 50/5 or 60/5 or 75/5 or 100/5 or 150/5.2, the utility model can avoid two secondaries of artificial short circuit end to occur, has good power-steeling preventing effect.

[description of drawings]

Fig. 1 is the stereogram of the utility model band electric energy meter connecting line;

Fig. 2 front view of the present utility model;

Fig. 3 is a cut-away view of the present utility model;

Cut-away drawing when Fig. 4 is two iron cores of employing of the present utility model;

Cut-away drawing when Fig. 5 is three iron cores of employing of the present utility model.

[embodiment]

Be described in further detail below in conjunction with accompanying drawing and execution mode of the present utility model:

Referring to Fig. 1-3, the utility model is the punching low-voltage current mutual inductor, include mounting panel 1, be fixed on the insulation crust 2 on the mounting panel 1, be provided with the through wires hole 21 that passes for tested primary winding at insulation crust 2 middle parts, a plurality of annular cores 3 that are tied with secondary coil respectively are set in insulation crust 2, these annular cores 3 are spaced apart successively along through wires hole 21 directions, secondary coil on each annular core 3 is cascaded successively, make the head end of the secondary coil on first annular core form a secondary leading-out terminal, the tail end of the secondary coil on last annular core forms another secondary leading-out terminal; Be provided with a boss on the top of insulation crust 2, this boss is provided with two screws, is threaded respectively bolt 4 to occur with the secondary of secondary leading-out terminal connection in two screws.Through such series connection, the precision of instrument transformer can be brought up to more than 6/10000ths, precision grade can be 0.1S, 0.2S, 0.5S, make the capacity of instrument transformer increase by 15%, angular difference reduces ± 5 fens, ratio reduces ± 2/100, and the secondary coil after the series connection and the no-load voltage ratio of tested primary winding can be 50/5 or 60/5 or 75/5 or 100/5 or 150/5.

Described annular core 3 is two or more.Cut-away drawing when being two iron cores of employing of the present utility model referring to Fig. 4; Cut-away drawing when Fig. 5 is three iron cores of employing of the present utility model.

Boss side surfaces at insulation crust has two antitheft electric wiring holes that run through.During use, the wiring of electric energy meter is passed from antitheft electric wiring hole, arrive the below of bolt, tight a bolt then,, so just the secondary coil of electric energy meter and instrument transformer can be electrically connected because bolt is a metal material, be provided with the nameplate that plastic material is made on the instrument transformer top, and seal with lead sealing, avoid two secondaries of artificial short circuit end to occur like this, can reach anti-electricity-theft purpose.

Mounting panel 1 in the utility model and insulation crust 2 are the injection mo(u)ldings of one epoxy, when making this product, now a plurality of iron cores that wind secondary coil are separated and be placed on successively on the casting machine, a plurality of secondary coils are together in series, once-cast has the epoxy resin of insulating effect well then, includes mounting panel 1 and insulation crust 2.

Claims

1. punching low-voltage current mutual inductor, include mounting panel (1), be fixed on the insulation crust (2) on the mounting panel (1), be provided with the through wires hole (21) that passes for tested primary winding at insulation crust (2) middle part, it is characterized in that in insulation crust (2), being provided with a plurality of annular cores (3) that are tied with secondary coil respectively, these annular cores (3) are spaced apart successively along through wires hole (21) direction, secondary coil on each annular core (3) is cascaded successively, make the head end of the secondary coil on first annular core form a secondary leading-out terminal, the tail end of the secondary coil on last annular core forms another secondary leading-out terminal; Be provided with the secondary that is connected connection respectively with two secondary leading-out terminals at insulation crust (2) top and bolt (4) occurs.

2. punching low-voltage current mutual inductor according to claim 1 is characterized in that insulation crust (2) is provided with boss, has two the antitheft electric wiring holes (5) that run through in boss side surfaces.

3. punching low-voltage current mutual inductor according to claim 1 is characterized in that described annular core (3) is two or more.

4. punching low-voltage current mutual inductor according to claim 1, the secondary coil after it is characterized in that connecting and the no-load voltage ratio of tested primary winding are 50/5 or 60/5 or 75/5 or 100/5 or 150/5.