CN203366985U

CN203366985U - Novel electronic combined transformer

Info

Publication number: CN203366985U
Application number: CN 201320426463
Authority: CN
Inventors: 唐晃; 曹希余; 杨福林; 李小利
Original assignee: HENGYANG YIHU ELECTRICAL INSTRUMENT CO Ltd
Current assignee: HENGYANG YIHU ELECTRICAL INSTRUMENT CO Ltd
Priority date: 2013-07-18
Filing date: 2013-07-18
Publication date: 2013-12-25
Anticipated expiration: 2023-07-18

Abstract

A novel electronic combined transformer comprises a primary lead, a coil winding, a coil iron core, an insulation shell, a sampling resistor, a high-voltage shielding case, a high-voltage resistor, a low-voltage shielding case, a metal base box, an aerial socket, a high-precision current transformer and a grounding bolt. The novel electronic combined transformer is characterized in that axial grooves are formed in the coil iron core. Primary current is measured by the aid of the current transformer with a grooved air gap iron core, a magnetic saturation point is improved as compared with a closed iron core, only one coil simultaneously functions in measurement and protection, and the novel electronic combined transformer is small in size, light in weight and high in practicability. Weak current flowing from the high-voltage resistor to a grounding end is measured by the aid of the high-precision current transformer, a primary system and a secondary system are completely isolated, electromagnetic resonance of a power grid is avoided, and the novel electronic combined transformer is easily connected with a digital meter and a microcomputer protection interface, so that the novel electronic combined transformer is higher in use safety.

Description

A kind of new-style electronic combination transformer

Technical field

The utility model relates to a kind of electric power mutual-inductor, particularly a kind of new-style electronic combination transformer.

Background technology

In the combination transformer used at 6～35KV electrical network at present; the measure portion of electronic current mutual inductor wherein, protection part are generally to adopt respectively low power current transformer, two coils of air core coil; if measure portion and protection part are adopted to a low power current transformer; owing to there being the magnetic saturation problem; just need to increase core section long-pending; volume is large, and cost is high.If low power current transformer is as measure portion, air core coil, as the protection part, just needs two coils of design, has so just increased volume and the waste mould material of instrument transformer.

Electronic type voltage transformer generally adopts electric resistance partial pressure or principle of capacitive divider, have measure bandwidth, dynamic property is good, the range of linearity is large, insulation system is simple, the advantage such as easy practical.But also there is obvious weak point, as: restricted application, isolation, the electrical secondary system fully that do not realize primary system and electrical secondary system are subject to the interference etc. of primary system.

Summary of the invention

The purpose of this utility model is in order to overcome above-mentioned weak point, and provides a kind of simple in structure, and certainty of measurement is high, uses safety, practical, can well realize the new-style electronic combination transformer that primary system and electrical secondary system are isolated fully.

The purpose of this utility model is achieved in that a kind of new-style electronic combination transformer, comprise wire, coil windings, iron-core coil, insulation shell, sample resistance, high-tension shielding cover, high-tension resistive, low pressure radome, metab box, aviation socket, high precision current transformer, earth stud, it is characterized in that on iron-core coil having axial notch.

The utility model is owing to adopting above architecture advances, have the axial notch air gap on iron-core coil in current transformer, when rated current, the section that magnetic flux does not almost all cut off from iron core passes through, effect and low power current transformer are much the same, have very little error; When the first short circuit electric current is quite large and be in transient process the time, the section that corresponding iron core does not cut off is significantly saturated, magnetic flux almost all passes through from iron core air gap, so just improved former iron core-closed saturation point, make it not occur when 20 times of rated current saturated, reflect exactly the current status of circuit.Therefore, utilize the characteristic of its groove air gap, realized only with a coil, making the function of measuring and protecting simultaneously.Voltage transformer adopts the high precision current transformer measurement to flow through the weak current of high-tension resistive to earth terminal; its secondary current is sent to control room by copper conductor, then becomes corresponding secondary voltage signal for instrument and protection interface through links such as current-voltage conversions.Realize the isolation fully of primary system and electrical secondary system, can not cause the electromagnetic resonance of electrical network, easy and digital instrument and Microcomputer Protection interface, thereby its safety in utilization is higher.

The accompanying drawing explanation

Fig. 1 is the utility model example structure schematic diagram;

Fig. 2 is the utility model core structure schematic diagram.

Embodiment

Now by reference to the accompanying drawings the utility model is made to detailed description.

As shown in Figure 1, a kind of new-style electronic combination transformer, comprise wire 1 one time, coil windings 2, iron-core coil 3, insulation shell 4, sample resistance 5, fairlead 6, high-tension shielding cover 7, high-tension resistive 8, low pressure radome 9, metab box 10, aviation socket 11, high precision current transformer 12, discharge tube 13, discharge tube support 14, earth stud 15, transducer bracket 16, wherein on iron-core coil 3 inwalls, have axial notch 17, the degree of depth of groove 17 is 1/2 to 2/3 of iron core 3 radial thicknesss, one time wire 1 passes from coil windings 2 centers, coil windings 2 is wrapped on iron-core coil 3, fairlead 6 vertically is placed in the below of coil windings 2, simultaneously as coil windings 2, the mounting bracket of iron-core coil 3 and sample resistance 5.The lead-in wire of coil windings 2 is in parallel with sample resistance 5, then connects with aviation socket 11 by fairlead 6.High-tension resistive 8 its upper ends connect high-tension shielding cover 7, and connect with a wire 1 by lead-in wire.High-tension resistive 8 lower ends connect low pressure radome 10, and with earth stud 15, connect through high precision current transformer 12 centers by lead-in wire, and the lead-in wire of high-tension resistive 8 is simultaneously in parallel with discharge tube 13 two ends.High precision current transformer 12 connects with aviation plug 11 by wire.Metab box 10 is arranged on insulation shell 4 belows.High precision current transformer 12, discharge tube 13 are arranged in metab box 10 by transducer bracket 16 and discharge tube support 14 respectively.Aviation socket 11 is arranged on metab box 10 1 sides.

Claims

1. a new-style electronic combination transformer, comprise a wire (1), coil windings (2), iron-core coil (3), insulation shell (4), sample resistance (5), high-tension shielding cover (7), high-tension resistive (8), low pressure radome (9), metab box (10), aviation socket (11), high precision current transformer (12), earth stud (15), it is characterized in that on iron-core coil (3) having axial notch (17).