CN102375135A

CN102375135A - Field calibration system of current transformer for metering

Info

Publication number: CN102375135A
Application number: CN2010102511963A
Authority: CN
Inventors: 唐湘城; 黄永康; 王翠翠; 姜杏辉
Original assignee: Suzhou Huadian Electric Co Ltd
Current assignee: Suzhou Huadian Electric Co Ltd
Priority date: 2010-08-11
Filing date: 2010-08-11
Publication date: 2012-03-14

Abstract

The invention discloses a field calibration system of a current transformer for metering. The field calibration system comprises a tested current transformer, a standard current transformer module electrically connected with the tested current transformer, and a transformer calibration module simultaneously connected with the tested current transformer and the standard current transformer module, and further comprises a control and detection display module which is mutually connected with the transformer calibration module. The system provided by the invention is the field calibration system which is simple and meets the measurement precision requirement, can effectively guarantee the feasibility of the field calibration of all 750 kV and 1000 kV engineering current transformers and leads the testing efficiency to be improved.

Description

The field-checking system of metering Current Transformer

Technical field

The present invention relates to a kind of check system of current transformer, concrete relate to a kind of field-checking system that measures Current Transformer.

Background technology

Along with the high speed development of domestic 1000kV power grid construction, the metering of 1000kV critical point is the important measures of guaranteeing electric quantity metering accuracy and reliability with the field-checking of mutual inductor.750kV critical point metering Current Transformer must be carried out the site error calibrating to it in strict accordance with vertification regulation before putting into operation.Gas-insulated gas insulated metal enclosed swit chgear (GIS) has advantages such as operational reliability height, floor area is little, easy to maintenance, security is good, more and more is widely used, and therefore, China 1000kV extra-high voltage demonstration project all is the GIS mode that adopts.

1000kV line power exchange capacity is big; The current ratio of current transformer reaches 5000A/1A and 6500A/1A in the GIS major loop; At present for the accuracy verification of metering Current Transformer in the GIS major loop, only 750kV East Lanzhou transformer station to GIS in current transformer carried out field-checking, adopt the mode of series resonance compensation to carry out verification; This test loop always is about about 390m, and test current reaches about 4800A.Adopt this method to need equipment more, the test loop is long, and the test loop is long more, and the testing equipment volume that needs is huge more, apparent capacity is also big more; Also there are problems such as automaticity is low, complex operation, reactive-load compensation adjustment difficulty simultaneously.

Summary of the invention

For overcoming deficiency of the prior art; The object of the present invention is to provide a kind of field-checking system that measures Current Transformer; This system is a kind of comparatively easy but satisfy the field-checking system of measuring accuracy needs, can effectively guarantee the feasibility of all 750kV and the verification of 1000KV engineering current mutual inductor on site and improve test efficiency.

For solving the problems of the technologies described above, reach above-mentioned technical purpose, the present invention adopts following technical scheme:

A kind of field-checking system that measures Current Transformer; Comprise that one is tried the standard current transformer module that current transformer is electrically connected by examination current transformer, with said; And one with the said transducer check module that is connected simultaneously by examination current transformer and standard current transformer module; It also comprises a control and detects display module that said control interconnects with detection display module and said transducer check module.

Further; Said control also is electrically connected a Power Entry Module, a controlled high capacity voltage regulating module, a high capacity up-flow module and a program control capacitor switching module with the detection display module; Said Power Entry Module is electrically connected said controlled high capacity voltage regulating module; Said controlled high capacity voltage regulating module is electrically connected said high capacity up-flow module, and said high capacity up-flow module is electrically connected said program control capacitor switching module.

Further, said program control capacitor switching module is electrically connected said standard current transformer module.

Preferably, said control integrates the formation master station with detection display module and said transducer check module.

The course of work of the present invention is following:

Advance by said Power Entry Module voltage is introduced said controlled high capacity voltage regulating module; Controlled high capacity voltage regulating module can carry out program control pressure regulation and reactive-load compensation to input voltage; Its output voltage is the big electric current of power frequency through excess capacity up-flow module converts; Above-mentioned each module related electric parameter is input to control synchronously and handles with centralized displaying with monitoring modular; The big electric current of this power frequency offers the standard current transformer module simultaneously and is tried current transformer through program control capacitor switching module; Compare to the standard current transformer module with by the current ratio and the phase place of examination current transformer through the transducer check module then, finally measure by examination current transformer ratio difference and phase data.

Compared with prior art, the system of the present invention scope of application is wide, antijamming capability by force, not only test is comparatively easy but also satisfy the demand of measuring accuracy again, can promote the use of.

Description of drawings

Fig. 1 measures the theory diagram of the field-checking system of Current Transformer for the present invention.

Label declaration among the figure: 1. Power Entry Module, 2. controlled high capacity voltage regulating module, 3. high capacity up-flow module; 4. program control capacitor switching module; 5. the standard current transformer module is 6. controlled and detection display module, 9. master station by examination current transformer 7. transducer check modules 8..

Embodiment

Below in conjunction with accompanying drawing, embodiments of the invention are carried out detailed introduction.

See also shown in Figure 1; A kind of field-checking system that measures Current Transformer; Comprise that one is tried the standard current transformer module 5 that current transformer 6 is electrically connected by examination current transformer 6, with said; And one with the said transducer check module 7 that is connected simultaneously by examination current transformer 6 and standard current transformer module 5, it also comprises a control and detects display module 8 that said control interconnects with detection display module 8 and said transducer check module 7.

Further; Said control with detect display module 8 and also be electrically connected the controlled high capacity voltage regulating module of a Power Entry Module 1, one 2, a high capacity up-flow module 3 and one program control capacitor switching module 4; Said Power Entry Module 1 is electrically connected said controlled high capacity voltage regulating module 2; Said controlled high capacity voltage regulating module 2 is electrically connected said high capacity up-flow module 3, and said high capacity up-flow module 3 is electrically connected said program control capacitor switching module 4.

Further, said program control capacitor switching module 4 is electrically connected said standard current transformer module 5.

Preferably, said control integrates with detection display module 8 and said transducer check module 7 and constitutes master station 9.

Further present embodiment is explained in detail below:

The core of the control system part of said control and monitoring display module 8 is digital signal processing chip (DSP); DSP has the special structural design of difference microprocessor, is more suitable for digital Signal Processing, can be some the theoretical and algorithm real-time implementation in the digital signal processing; The task for processing of digital signal need be accomplished a large amount of real-time calculating usually; In the present invention, need to accomplish fast Fourier FFT and calculate and Real Time Control Function, it is suitable therefore selecting dsp chip for use.

Preferably,, adopted the genlock frequency doubling technology, realized synchronous A/D sampling, reduced measuring error for cooperating software Fourier transform scheduling algorithm.

The detection display module part of said control and monitoring display module 8 detects the operating mode of system, and described detection display module has mainly comprised intelligent reometer, intelligent voltage table, power-factor indicator or the like.The object of monitoring of working condition comprises the input voltage of pressure regulator, output voltage, output current, power factor (PF) or the like.

Described control system part is communicated by letter with said monitoring display part through the RS485 bus, gathers work information, according to calculating and the judgement to work information; Make corresponding control, under the work condition abnormality situation, do anxious stopping; Captions alarm prompts etc. are with the safe operation of protection system.

Claims

1. field-checking system that measures Current Transformer; Comprise that one is tried the standard current transformer module (5) that current transformer (6) is electrically connected by examination current transformer (6), with said; And one with said by examination current transformer (6) and the transducer check module (7) that is connected simultaneously of standard current transformer module (5); It is characterized in that: also comprise a control and detect display module (8), said control interconnects with detection display module (8) and said transducer check module (7).

2. the field-checking system of metering Current Transformer according to claim 1; It is characterized in that: said control also is electrically connected a Power Entry Module (1), a controlled high capacity voltage regulating module (2), a high capacity up-flow module (3) and a program control capacitor switching module (4) with detection display module (8); Said Power Entry Module (1) is electrically connected said controlled high capacity voltage regulating module (2); Said controlled high capacity voltage regulating module (2) is electrically connected said high capacity up-flow module (3), and said high capacity up-flow module (3) is electrically connected said program control capacitor switching module (4).

3. the field-checking system of metering Current Transformer according to claim 2 is characterized in that: said program control capacitor switching module (4) is electrically connected said standard current transformer module (5).

4. according to the field-checking system of any described metering Current Transformer in the claim 1 to 3, it is characterized in that: said control with detect display module (8) and integrate with said transducer check module (7) and constitute master station (9).