CN103680897A

CN103680897A - Current transformer for solid-insulated ring main unit

Info

Publication number: CN103680897A
Application number: CN201310606058.6A
Authority: CN
Inventors: 杨峰; 姚金龙; 姚海明; 蔡强; 朱冬明; 印慧
Original assignee: JIANGSU KEXING ELECTRICAL APPLIANCES CO Ltd
Current assignee: JIANGSU KEXING ELECTRICAL APPLIANCES CO Ltd
Priority date: 2013-11-26
Filing date: 2013-11-26
Publication date: 2014-03-26
Anticipated expiration: 2033-11-26
Also published as: CN103680897B

Abstract

The invention relates to a current transformer for a solid-insulated ring main unit. The current transformer comprises an iron core integrally poured in an epoxy resin shell, a primary coil and a secondary coil. An isolated bus sleeve and an isolated bus sleeve insertion base are arranged on the epoxy resin shell, the wire ingoing end of the primary coil is connected to the isolated bus sleeve or in the isolated bus sleeve insertion base to be in an exposed state, the wire outgoing end of the first coil is connected to the isolated bus sleeve insertion base or in the isolated bus sleeve to be in an exposed state, and the outer wall of the isolated bus sleeve is matched with the inner wall of the isolated bus sleeve insertion base. The current transformer is simple and compact in structure, small in size, convenient to install and maintain and favorable for saving installation space inside a switch cabinet and improving insulation performance and use safety performance.

Description

A kind of solid insulation ring main unit Current Transformer

Technical field

The present invention relates to current transformer, is a kind of solid insulation ring main unit Current Transformer of making high-tension measurement or used for relay protection specifically.

Background technology

Existing for 35kV and following electric pressure switch cabinet current transformer, its primary winding into and out of line terminals and switch cabinet one-time line electric conductor, be exposed being connected in gas medium, under operating state, current transformer is high potential at two ends, and in switch cubicle, between electronegative potential parts, be to realize insulation by air insulated, in order to guarantee enough dielectric strengths, air insulated required distance is high, must cause the volume of instrument transformer to increase; A leading-out terminal of current transformer is connected with bolts with the high-pressure side of switch cubicle, at switch cubicle, gradually under the trend of miniaturization, installing/dismounting space is more and more less, and working service is extremely inconvenient; In addition, Potential distribution between instrument transformer high potential and electronegative potential is at current transformer outer surface, Potential distribution does not allow staff to touch or approach instrument transformer in running status, otherwise can there is Danger Electric shock risk, in order to guarantee staff's personal safety, prevent the generation of accidental shock accident, in prior art conventionally at current transformer arranged outside electronegative potential division board, it is large that electronegative potential division board takies the space of switch cubicle, also has the problem of installation, demolition and maintenance inconvenience.

Summary of the invention

For above-mentioned deficiency of the prior art, the invention provides a kind of simple in structure, compact, volume is little, installation, easy to maintenance, the solid insulation ring main unit Current Transformer that is conducive to save installing space in switch cubicle, raising insulation property and usage safety performance.

The technical solution used in the present invention is: a kind of solid insulation ring main unit Current Transformer, comprise that one is cast in the iron core in epoxy package, primary winding and secondary coil, its technical characterstic is that described epoxy package is provided with isolated bus sleeve pipe and isolated bus cover pipe insert seat, the end of incoming cables of primary winding is connected in isolated bus sleeve pipe or isolated bus cover pipe insert seat and is the state of exposing, the leading-out terminal of primary winding is connected in isolated bus cover pipe insert seat or isolated bus sleeve pipe and is the state of exposing, isolated bus sleeve outer wall is the corresponding shape of coincideing with isolated bus cover pipe insert seat inwall.

Further, described isolated bus sleeve pipe and isolated bus cover pipe insert seat respectively correspondence be arranged at epoxy package outer wall both sides.

Further, primary winding is connected in into and out of line end the Primary Conductor of revealing inside and outside isolated bus sleeve pipe or isolated bus cover pipe insert seat.

Further, the inwall of the outer wall of described isolated bus sleeve pipe or isolated bus cover pipe insert seat is provided with elastic insulated parietal layer.

Further, described isolated bus sleeve outer wall is taper, and isolated bus cover pipe insert seat inwall is inverted cone shape.

Further, the non-exposed junction of described Primary Conductor is in obturating plug is fixedly connected on isolated bus sleeve pipe or isolated bus cover pipe insert seat, and obturating plug is fixedly connected on isolated bus sleeve pipe or isolated bus cover pipe insert seat through bolt and insulation cushion.

Further, the Primary Conductor exposed junction into and out of line end of described primary winding is protruding, recessed identical state.

Again further, described epoxy package is provided with metal level outward.

Adopt technique scheme, the beneficial effect that the present invention reaches is:

1, entering of current transformer primary winding, leading-out terminal is designed to respectively isolated bus sleeve pipe, isolated bus sleeve pipe socket, isolated bus sleeve pipe and the tapered shape of isolated bus cover pipe insert seat, in installation process, entering of primary winding, in the Primary Conductor exposed junction of leading-out terminal and switch cubicle, isolated bus sleeve pipe or isolated bus cover pipe insert seat are connected to form once closed current path, taper plugs together docking fast, accurately, stable, need not connect by bolt-locking, be convenient to install in compact switch cubicle space, disassembling section, be conducive to reduce switch cubicle volume,

2, on isolated bus sleeve outer wall, isolated bus cover pipe insert seat inwall, elastic insulated parietal layer is set, greatly improved between high pressure primary conductive part and switch cubicle equipment electronegative potential parts and the dielectric strength between high pressure phase, be conducive to improve insulation property and stable connection performance;

3, at epoxy resin poured body shell, metal level is set outward, metal level is connected with the earthing screw of instrument transformer and makes the direct ground connection of outer surface of instrument transformer, the outer surface of instrument transformer is in zero potential, the safety that has realized instrument transformer is tangible, ring main unit can consider that in design high-pressure side holds insulation distance over the ground in addition, makes the miniaturization of ring main unit become possibility.

The present invention is arranged to the isolated bus sleeve pipe of cone-shaped and isolated bus cover pipe insert seat by primary winding into and out of line end, be connected and realize closed path path with plugging together of isolated bus sleeve pipe with corresponding isolated bus cover pipe insert seat in switch cubicle, it is simple in structure, compact, volume is little, installation, easy to maintenance, be conducive to save installing space in switch cubicle, improve and plug together firm performance, insulation property and usage safety performance.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

In figure: epoxy package 1, primary winding 2, secondary coil 3,4, inlet wire conductors 5 of isolated bus sleeve pipe, 6, outlet conductors 7 of isolated bus cover pipe insert seat, obturating plug 8, insulation cushion 9, elastic insulated parietal layer 10.

Embodiment

Below in conjunction with drawings and Examples, the invention will be further described.

Shown in Fig. 1, a kind of solid insulation ring main unit Current Transformer comprises that one is cast in the iron core in epoxy package 1, primary winding 2 and secondary coil 3, epoxy package 1 both sides are provided with isolated bus sleeve pipe 4 and isolated bus cover pipe insert seat 6, one time, the end of incoming cables inlet wire conductor 5 of primary winding 2 is connected in isolated bus sleeve pipe 4 and is the state of exposing, the leading-out terminal of primary winding 2 is connected in isolated bus cover pipe insert seat 6 and is the state of exposing through an outlet conductor 7, isolated bus sleeve pipe 4 is frustum, isolated bus cover pipe insert seat 6 inwalls are inversed taper platform shape, corresponding the coincideing of shape of isolated bus sleeve pipe 4 and isolated bus cover pipe insert seat 6, the inwall of isolated bus cover pipe insert seat 6 is equipped with elastic insulated parietal layer 10, one end of an outlet conductor 7 is exposed in isolated bus cover pipe insert seat 6, the other end is through obturating plug 8, insulation cushion 9 is fixedly connected with isolated bus cover pipe insert seat 6.

Claims

1. a solid insulation ring main unit Current Transformer, comprise that one is cast in iron core, primary winding and the secondary coil in epoxy package, it is characterized in that: described epoxy package is provided with isolated bus sleeve pipe and isolated bus cover pipe insert seat, the end of incoming cables of primary winding is connected in isolated bus sleeve pipe or isolated bus cover pipe insert seat and is the state of exposing, the leading-out terminal of primary winding is connected in isolated bus cover pipe insert seat or isolated bus sleeve pipe and is the state of exposing, and isolated bus sleeve outer wall is the corresponding shape of coincideing with isolated bus cover pipe insert seat inwall.

2. a kind of solid insulation ring main unit Current Transformer according to claim 1, is characterized in that: described isolated bus sleeve pipe and isolated bus cover pipe insert seat respectively correspondence are arranged at epoxy package outer wall both sides.

3. a kind of solid insulation ring main unit Current Transformer according to claim 1, is characterized in that: described primary winding into and out of line end, be connected in the Primary Conductor of revealing inside and outside isolated bus sleeve pipe or isolated bus cover pipe insert seat.

4. according to a kind of solid insulation ring main unit Current Transformer described in claim 1 or 2 or 3, it is characterized in that: the inwall of the outer wall of described isolated bus sleeve pipe or isolated bus cover pipe insert seat is provided with elastic insulated parietal layer.

5. according to a kind of solid insulation ring main unit Current Transformer described in claim 1 or 2 or 3, it is characterized in that: described isolated bus sleeve outer wall is taper, isolated bus cover pipe insert seat inwall is inverted cone shape.

6. a kind of solid insulation ring main unit Current Transformer according to claim 3, it is characterized in that: the non-exposed junction of described Primary Conductor is in obturating plug is fixedly connected on isolated bus sleeve pipe or isolated bus cover pipe insert seat, and obturating plug is fixedly connected on isolated bus sleeve pipe or isolated bus cover pipe insert seat through bolt and insulation cushion.

7. according to a kind of solid insulation ring main unit Current Transformer described in claim 3 or 6, it is characterized in that: the Primary Conductor exposed junction into and out of line end of described primary winding is protruding, recessed identical state.

8. a kind of solid insulation ring main unit Current Transformer according to claim 1, is characterized in that: described epoxy package is provided with metal level outward.