CN2426638Y

CN2426638Y - High voltage optical pass split core current transformer

Info

Publication number: CN2426638Y
Application number: CN 00212272
Authority: CN
Inventors: 朱建新; 徐志远; 罗洪彬; 王光宏; 张子峰
Original assignee: SHENYANG INST OF POWER ENGINEE
Current assignee: SHENYANG INST OF POWER ENGINEE
Priority date: 2000-06-15
Filing date: 2000-06-15
Publication date: 2001-04-11
Anticipated expiration: 2010-06-15

Abstract

The utility model relates to a high-voltage optical pass forcipated current mutual inductor, which belongs to a current parameter acquisition device of a high-voltage feeder, wherein the tail end of the current mutual inductor is connected with an optical pass pipe. A high-voltage measuring terminal of the optical pass is provided with a high-voltage measuring circuit which is composed of an I / V conversion circuit, a waveform amplification circuit, a waveform translation circuit, a V / F conversion circuit, a modulation circuit and an infrared transmission circuit. The end of the optical pass is provided with a reception output circuit, which is composed of an infrared reception circuit, a demodulation circuit, a dressing circuit, an F / V conversion circuit, a low pass filter circuit, an amplification circuit and an output circuit. The utility model has the advantages of real-time and continuous collection and output of currents in high-voltage lines with the voltage below 500 kv, high precision, strong anti-interference ability, and convenient operation and carrying.

Description

The high-voltage light-channel split core type current transformer

The utility model relates to a kind of high-voltage light-channel split core type current transformer, belongs to high voltage feeder current parameter acquisition utensil, is particularly suitable in the mesohigh electric power system the accurately continuous measurement in real time to the electric current parameters.

In the past to meritorious, reactive power, power factor (PF), when electrical quantitys such as CT, PT are measured, require to obtain in real time, accurately the parameters such as electric current, voltage on institute survey time road, and split core type current transformer is normally adopted in the acquisition of online current parameters.This has been mature technique very in low-voltage power supply system stream, yet in middle and high pressure electric power system to each parameter of line current in real time, accurately measurement but becomes a great problem in the current electric power system, this not only makes electric industry management department can not accurately grasp every electrical quantity in the middle and high pressure electric power system, can't realize scientific management, steal electricity also for simultaneously some illegal producer opportunity is provided, cause the loss of national energy.For these reasons, abroad certain company develops a kind of testing current instrument of 6 kilovolt, and its precision is 1.2---and 5%, however, yet still be powerless to the measurement of high-tension line more than 10 kilovolts; Domestic someone once utilizes at high-pressure side and adopts the A/D conversion to be tested by the infrared test lead that is sent to again.The shortcoming of this kind method of testing is that transfer rate is very low, and precision is relatively poor, and more can not carry out synchronous acquisition with voltage signal, therefore, can only it be applied be subjected to certain limitation as rough single current acquisition.

The purpose of this utility model be to provide a kind of to current waveform in the high voltage supply system below the 500KV carry out the collection of accurate real-time continuous and output and cooperate also with High-Voltage Testing Technology that it is complementary can measure every parameters of electric power such as active power, reactive factor, CT, PT, stable performance, safe and reliable, antijamming capability strong, use high-voltage light-channel split core type current transformer easy to carry.

The purpose of this utility model realizes by the following technical solutions, form by current transformer, the tail end of its current transformer links to each other with the optical channel pipe, the high-tension measurement end of optical channel is provided with the high-voltage measuring circuit that is made of I/V conversion, waveform amplification, waveform translation, V/F conversion, modulation and infrared transtation mission circuit, is provided with the reception output circuit that is made of infrared reception, demodulation, shaping, F/V conversion, low-pass filtering, amplification and output circuit at the end of optical channel.

Described optical channel is any one in vacuum optical channel and the airlight passage.

The utility model compared with prior art, owing to broken through the constraint of traditional high pressure acquisition mode thinking, adopt V/F, the F/V switch technology, and detect proof through relevant department and have in the high voltage supply system pair below the 500KV electric current parameters carry out in real time, continuously, synchronous high-speed is gathered and output, its precision reaches 0.5%, stable performance, safe and reliable antijamming capability is strong, easy to carry, with cooperate with High-Voltage Testing Technology that it is complementary also can be to active power, reactive power, power factor (PF), CT, every parameters of electric power such as PT carries out portable type measuring, has solved the matter of great urgency in this field.

Fig. 1 is a main TV structure schematic diagram of the present utility model.

Fig. 2 is the circuit block diagram of high-voltage measuring circuit.

Fig. 3 is the former frame principle figure of circuit that receives output circuit.

Fig. 4 is the circuit theory diagrams of high-voltage measuring circuit.

Fig. 5 is the circuit theory diagrams that receive output circuit.

Enforcement of the present utility model is described in detail in conjunction with the accompanying drawings, the tail end of split core type current transformer 1 links to each other with optical channel pipe 4, the high-tension measurement end of optical channel 3 is provided with by I/V to be changed, waveform amplifies, reference voltage, the waveform translation, the V/F conversion, the high-voltage measuring circuit 2 that modulation and infrared emission circuit constitute is provided with by infrared reception at the end of optical channel 3, demodulation, shaping, the F/V conversion, low-pass filtering, amplify the reception output circuit 5 that constitutes with output circuit, pincerlike head is provided with jaw folding backguy 6, described optical channel 3 is vacuum optical channels, still can which kind of determine to use be advisable according to the high pressure range of tested electric power system with the airlight passage.After being encapsulated in the metal screen shell respectively, described high-voltage measuring circuit 2 and reception output circuit 5 reinstall corresponding separately position.

When the utility model used, earlier with on the electric wire in the high voltage supply system of pliers head clip below tested 500KV, the output that receives output circuit 5 linked to each other with secondary meter.The current signal that current transformer 1 collects is converted to corresponding sinusoidal voltage signal through I/V, amplify by waveform, waveform translation circuit is handled, make it become the required voltage signal of V/F change-over circuit, be converted to the correspondent frequency pulse signal by V/F again, after modulating, modulation circuit sends to the infrared receiving circuit that receives in the output circuit 5 by infrared transtation mission circuit, the data-signal of receiving is again after demodulator circuit is reduced to pulse duration frequency signal, by shaping circuit it is handled, make it to become the required undersuing of F/V circuit, be corresponding sinusoidal voltage signal by the F/V circuit conversion again, after low-pass filter circuit filters disturbing wave, amplify by amplifying circuit and to export secondary meter to and can obtain the electrical quantity that to survey.

Claims

1, a kind of high-voltage light-channel split core type current transformer, form by current transformer (1), the tail end that it is characterized in that current transformer (1) links to each other with optical channel pipe (4), the high-tension measurement end of optical channel (3) is provided with the high-voltage measuring circuit (2) that is made of I/V conversion, waveform amplification, waveform translation, V/F conversion, modulation and infrared transtation mission circuit, is provided with the reception output circuit (5) that is made of infrared reception, demodulation, shaping, F/V conversion, low-pass filtering, amplification and output circuit at the end of optical channel (3).

2, current transformer according to claim 1 is characterized in that described optical channel (3) is any one in vacuum optical channel and the airlight passage.