CN102368431B

CN102368431B - 3-35kV electromagnetic multi-functional voltage transformator

Info

Publication number: CN102368431B
Application number: CN 201110054280
Authority: CN
Inventors: 胥卫; 蔡强; 杨峰
Original assignee: JIANGSU KEXING ELECTRICAL APPLIANCES CO Ltd
Current assignee: JIANGSU KEXING ELECTRICAL APPLIANCES CO Ltd
Priority date: 2011-03-08
Filing date: 2011-03-08
Publication date: 2013-06-19
Anticipated expiration: 2031-03-08
Also published as: CN102368431A

Abstract

The invention relates to a 3-35kV electromagnetic multi-functional voltage transformator which comprises an iron core, a primary winding and a main secondary winding; the primary winding and the main secondary winding are wound on the iron core; an auxiliary secondary winding is also wound on the iron core; and a tap is arranged on the auxiliary secondary winding. According to the voltage transformator, the auxiliary secondary winding with the tap is additionally arranged on the iron core, so that the functions of a grounded transformator and a non-grounded transformator are realized on the same transformator, and the 3-35kV electromagnetic multi-functional voltage transformator has a simple and compact structure, low losses and no local discharge, is convenient to use, has high safety performance, is maintenance-free, and is applicable to 3-35kV voltage systems.

Description

The 3-35kV electromagnetic potential transformer

Technical field

The present invention relates to electromagnetic technology field, particularly relate to electromagnetic potential transformer, is a kind of multifunctional electromagnetic formula voltage transformer, corresponding to the electromagnetic potential transformer of 3-35kV in electric power system specifically.

Technical background

Existing 3-35kV electromagnetic potential transformer (hereinafter referred to as voltage transformer) can be divided into earthed voltage transformer and unearthed voltage transformer according to the mode of connection.The general user is when ordering or use, and the voltage transformer that specifically adopts which kind of type is not too clear, just finds even when mounted, earthed voltage transformer and unearthed voltage transformer are obscured mutually, cause client's inconvenience, delay construction period, increase cost and drop into, cause the wasting of resources.

Existing most of earthed voltage transformers adopt laminated core or C iron-core, and this class core loss is large, and its instrument transformer excitation property is poor, and is easily saturated, and circuit ferro resonance probability is high.Earth-free instrument transformer performance data be generally under 120% rated voltage under no-load current and rated voltage the ratio of no-load current 2-3 doubly between, ground connection instrument transformer performance data be generally under 190% rated voltage under no-load current and 100% rated voltage the ratio of no-load current be 5-15 doubly between, it is 3kV that earth terminal of conventional earthed voltage transformer reaches the secondary voltage withstand class over the ground, when circuit generation earth fault, the overvoltage that produces easily makes the earth terminal insulation damages, cause instrument transformer to burn, bring very large inconvenience to electric power system and user.

Summary of the invention

In order to overcome in prior art the ground connection instrument transformer and earth-free instrument transformer is produced separately, use cost is high, easily obscure, the low deficiency that waits of usage safety performance, the objective of the invention is to adopt a kind of compact conformation, low-loss, security performance 3-35kV electromagnetic potential transformer high, easy to use, realized providing on an instrument transformer function of ground connection instrument transformer and earth-free instrument transformer.

The technical solution used in the present invention is: a kind of 3-35kV electromagnetic potential transformer, comprise iron core, winding and main secondary winding, winding and main secondary winding all are around on iron core, its technical characterstic is also to be wound with an auxiliary secondary winding on described iron core, has tap on auxiliary secondary winding; The tap of described auxiliary secondary winding and the end of auxiliary secondary winding are not on-state simultaneously.

Described iron core is rectangle iron core.

Described main secondary winding is one or more.

The described main secondary winding number of turn is identical with the auxiliary secondary winding number of turn.

When this voltage transformer used as earthed voltage transformer: voltage transformer generally was with the residue winding to protect whole circuit, and the first and end of main secondary winding normally is communicated with, and the head end of auxiliary secondary winding and tap are connected and made the residue winding; Under special circumstances, the first and end of auxiliary secondary winding is connected and is done second main secondary winding use, is not with the residue winding this moment.

When this voltage transformer uses as unearthed voltage transformer: voltage transformer generally, the first and end of main secondary winding normally is communicated with use; Under special circumstances, the first and end of auxiliary secondary winding is connected and is done second main secondary winding use.

After adopting above technical scheme, the beneficial effect that the present invention reaches is:

1, transformer iron core adopts annular core, and around forming, compact conformation, loss are low, are difficult for bringing out ferro resonance, use stable, safe and reliable by the silicon-steel sheet coiled of high-quality for iron core;

2, main secondary winding can according to specification requirement, be set as one or more windings, auxiliary secondary winding is a winding with tap, the tap of auxiliary secondary winding and the end of auxiliary secondary winding are not on-state simultaneously, can be grounded the exchange of instrument transformer and unearthed voltage transformer function, when earth-free, the auxiliary secondary winding secondary winding of can deciding is used, during ground connection, auxiliary secondary winding can be done ground connection, residue winding and main secondary winding are used, the ground connection instrument transformer has stronger resonance resisting capacity, it is used that the residue winding is done relaying protection when earth fault to occur, avoided burning of instrument transformer, easy to use, safety, need not be equipped with respectively ground connection and earth-free two kinds of voltage transformers, do not occur because mode of connection difference causes situation about can not install to on-the-spot after not having order, reduce under analogue and cause the cycle of delaying engineering, increasing cost drops into, cause man power and material's waste, satisfying various occasions uses.

The function of ground connection instrument transformer and earth-free instrument transformer set up an auxiliary secondary winding with tap and realizes providing on an instrument transformer by voltage transformer of the present invention on iron core, it is simple in structure, compact, low-loss, without partial discharge, performance easy to use, safe is high, non-maintaining, and the electrical voltage system that is applicable to 3-35kV is used.

Description of drawings

Fig. 1 is the structural representation of one embodiment of the invention;

Fig. 2 is the structural representation of another embodiment of the present invention.

In figure: 1,11, winding 2 unshakable in one's determination, 21, main secondary winding 3,31,32, auxiliary secondary winding 4,41, tap 5,51.

Embodiment

The invention will be further described below in conjunction with drawings and Examples.

Embodiment illustrated in fig. 1 one, a kind of 3-35kV electromagnetic potential transformer comprises 1, winding 2, main secondary winding 3 and an auxiliary secondary winding 4 unshakable in one's determination.One time winding 2, main secondary winding 3 and auxiliary secondary winding 4 all are around on unshakable in one's determination 1, unshakable in one's determination 1 is rectangle iron core, main secondary winding 3 numbers of turn are identical with auxiliary secondary winding 4 numbers of turn, have tap 5 on auxiliary secondary winding 4, the tap 5 of auxiliary secondary winding is not on-state simultaneously with the end of auxiliary secondary winding.

Take a 10(10/ √ 3) kV electromagnetic multifunctional voltage transformer is as example, it has a main secondary winding (0.1(0.1/ √ 3) kV) and an auxiliary secondary winding (0.1/ √ 3(0.1/3)-0.1(0.1/ √ 3) kV).When doing the unearthed voltage transformer use, the user assists the tap ground connection of secondary winding this moment as long as connect the requirement that the first and end of main secondary winding just can reach secondary output 0.1 kV; Two 0.1kV outputs only need connect the first and end of auxiliary secondary winding as needs, and auxiliary secondary winding and main secondary winding are exported 0.1kV simultaneously; When using as earthed voltage transformer, the first and end secondary of main secondary winding is output as 0.1/ √ 3 kV, and auxiliary secondary winding head end and tap terminals form earthed voltage transformer residue winding, and the residue winding is output as 0.1/3 kV and shields.

Embodiment illustrated in fig. 2 two, a kind of 3-35kV electromagnetic potential transformer comprises 11, windings 21 unshakable in one's determination, main secondary winding 31,32 and auxiliary secondary winding 41.Winding 21, main secondary winding 31,32 and auxiliary secondary winding 41 all be around on iron core, unshakable in one's determination 11 is rectangle iron core, main secondary winding 31,32 numbers of turn are identical with auxiliary secondary winding 41 numbers of turn, have tap 51 on auxiliary secondary winding 41, the tap 51 of auxiliary secondary winding is not on-state simultaneously with the end of auxiliary secondary winding.

Take a 10(10/ √ 3) the kV electromagnetic potential transformer is as example, it has two main secondary winding (0.1(0.1/ √ 3) kV) and an auxiliary secondary winding (0.1/ √ 3(0.1/3)-0.1(0.1/ √ 3) kV).When doing the unearthed voltage transformer use, the user assists the tap ground connection of secondary winding this moment as long as connect the requirement that the first and end of two main secondary winding just can reach secondary output 0.1 kV; Three 0.1kV outputs only need connect auxiliary secondary winding first and end again as needs, and two main secondary winding and an auxiliary secondary winding are exported 0.1kV simultaneously; When using as earthed voltage transformer, the first and end of two main secondary winding all is output as 0.1/ √ 3 kV, and auxiliary secondary winding head end and tap form earthed voltage transformer residue winding, and the residue winding is output as 0.1/3 kV and shields.

Claims

1. 3-35kV electromagnetic potential transformer, comprise iron core, winding and main secondary winding, winding and main secondary winding all are around on iron core, it is characterized in that: also be wound with an auxiliary secondary winding on described iron core, have tap on auxiliary secondary winding; The tap of described auxiliary secondary winding and the end of auxiliary secondary winding are not on-state simultaneously.

2. 3-35kV electromagnetic potential transformer according to claim 1, it is characterized in that: described iron core is rectangle iron core.

3. 3-35kV electromagnetic potential transformer according to claim 1, it is characterized in that: described main secondary winding is one or more.

4. according to claim 1 or 3 described 3-35kV electromagnetic potential transformers, it is characterized in that: the described main secondary winding number of turn is identical with the auxiliary secondary winding number of turn.