CN201332014Y

CN201332014Y - Electronic type voltage transformer for digital transformer substation

Info

Publication number: CN201332014Y
Application number: CNU2009200386181U
Authority: CN
Inventors: 黄麟; 陆汉兵
Original assignee: Individual
Current assignee: Jingjiang Jiangsu Mutual Inductor Ltd By Share Ltd
Priority date: 2009-01-05
Filing date: 2009-01-05
Publication date: 2009-10-21
Anticipated expiration: 2019-01-05

Abstract

The utility model relates to an electronic type voltage transformer for digital transformer substation composed of a capacitive voltage divider and a digital converter. The capacitive voltage divider is arranged on the center of the transformer main body and is encapsulated by the polyurethane mixed glue, a high voltage bushing is arranged on the outermost layer; an acquiring device is arranged on the right line, the output signal of the capacitive voltage divider is converted into a serial digital optical signal to output after being processed by the digital converter. The utility model has simple structure, the oil for the traditional transformer is replaced by the insulated grease to directly form a dry type integer, the transformer has stabilized performance, the mounting and the using are simple and convenient, without maintaining the operation. The weight is light, the precision is high, the linearity is good, the measured range is wide, the disadvantages of narrow frequency band and slow response of the traditional electromagnetic voltage transformer can be overcome.

Description

Electronic voltage transformer for digitalized power substation

Technical field:

The utility model relates to a kind of electronic type voltage transformer; refer more particularly to the totally-enclosed column support type electronic voltage transformer for digitalized power substation of 110kV polyurethane embedding; its output is the small voltage signal; can be directly and instrument, protective relaying device interface, thus realize metering, control, measure, the function of protection.

Background technology:

Along with the develop rapidly of electronic technology, microcomputer type relay protection and electronic electricity meter have progressively occupied leading position, in relaying protection and measuring, and the energy stream and the separate from information flow of control section, thereby monitoring equipment no longer needs the instrument transformer of high power output.Simultaneously because the application of fast development, the integrated automation of transformation stations and the power distribution automation of power industry, therefore, the first-selected problem that to develop a kind of low energy consumption novel voltage mutual inductor with measurement, protection and ability to communicate be manufacturer.

Summary of the invention:

The purpose of this utility model is exactly that a kind of electronic voltage transformer for digitalized power substation brand-new, compact conformation will be provided.The purpose of this utility model is to realize like this, electronic voltage transformer for digitalized power substation, form by capacitor voltage divider and digitalizer two parts, it is characterized in that: capacitor voltage divider is arranged on the central authorities of current transformer body, by the embedding of polyurethane epoxy glue, bushing is arranged on outermost layer on it; The right circuit is provided with collector; The output signal of capacitor voltage divider is converted to the output of serial digital light signal after digitalizer is handled.

The utility model is simple in structure, has substituted the oil or the SF6 of traditional instrument transformer with insulation fat, directly forms dry type integral body, and the instrument transformer performance is more stable, installs and uses simple and conveniently, and operation need not safeguarded.In light weight, precision is high, good linearity, measuring range are wide, shortcoming such as the frequency band that has overcome traditional electromagnetic potential transformer is narrow, low-response.Safe, not danger such as inflammable, the explosive that produces because of trapped fuel.Cost is low, and instant effect has realistic meaning to the transformation of existing transformer station electric equipment and the construction of raising digital transformer substation.All signals transmit by the multiple twin shielding conductor, help strengthening the ability of anti-electromagnetic interference.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

1, bushing, 2, the polyurethane epoxy glue, 3, capacitor voltage divider, 4, current transformer body, 5, collector.

Embodiment:

The utility model is described in further detail below in conjunction with accompanying drawing;

In the drawings, electronic voltage transformer for digitalized power substation is made up of capacitor voltage divider 3 and digitalizer two parts, and it is characterized in that: capacitor voltage divider 3 is arranged on the central authorities of current transformer body, by 2 embeddings of polyurethane epoxy glue, bushing 1 is arranged on outermost layer on it; The right circuit is provided with collector 5; The output signal of capacitor voltage divider 3 is converted to the output of serial digital light signal after digitalizer is handled.During concrete enforcement, adopted unique sensing arrangement, capacitance is minimum, utilizes ripe capacitance partial pressure technology but not contain iron-core coil, and voltage divider adopts low pressure output, uncompensated reactance and annex, so this capacitance type potential transformer do not have ferro resonance, simple in structure.Need not to consider problems such as complicated technology and stability.Capacitor voltage divider is the signal acquiring unit of system, by capacitor connection in series-parallel combination the electrical network high voltage is carried out dividing potential drop.Consider from two aspects: the one, capacitor voltage divider places outdoor, and variations in temperature can directly influence the voltage ratio of capacitor voltage divider on a large scale, makes its instability, thereby influences accuracy of measurement; The 2nd, the phase difference that the dividing potential drop of capacitor is introduced.So adopt the mode of capacitor connection in series-parallel combination to come dividing potential drop, to reduce the influence of temperature to voltage ratio; On the software temperature is carried out information fusion as important parameter in the system and voltage signal, to eliminate the influence of variations in temperature to whole system.Show that by experiment the instrument transformer linearity is good, accuracy satisfies 0.2 grade of requirement in-40 ℃～+ 45 ℃ temperature ranges.Become current transformer body with the polyurethane embedding.The output signal of capacitor voltage divider is converted to the output of serial digital light signal after digitalizer is handled.Take signal by collector from low-pressure side, enter the combiner received signal.

The output of the utility model secondary meets the specified secondary output voltage of IEC60044-7:1999 and GB/T208407-2007 " electronic type voltage transformer " standard.Can be directly and instrument, protective relaying device interface, directly supporting with the digital transformer substation complex automatic system.Thereby realize the function of metering, control, measurement, protection.

Claims

1. electronic voltage transformer for digitalized power substation, form by capacitor voltage divider (3) and digitalizer two parts, it is characterized in that: capacitor voltage divider (3) is arranged on the central authorities of current transformer body (4), by polyurethane epoxy glue (2) embedding, bushing (1) is arranged on outermost layer on it; The right circuit is provided with collector (5); The output signal of capacitor voltage divider (3) is converted to the output of serial digital light signal after digitalizer is handled.