SU1171728A1 - Device for measuring particle discharge - Google Patents

Abstract

A DEVICE FOR MEASURING PARTIAL DISCHARGES containing a source of partial discharges connected to a high-pass filter, to which code the preamplifier is connected, and a recording device is connected to the output of the preamplifier, in order to determine the accuracy and reliability of the measurements. An analog key and a key control signal generating unit containing an anti-coincidence circuit, a limiter amplifier and a two-pole impulse converter connected in series with it All of them are unipolar, the output of which is connected through two parallel branches with two inputs of the anti-coincidence circuit, one of the branches is a direct link, the other branch contains a series-connected differentiating device and a unipolar limiting amplifier, and the output of the anti-coincidence circuit is connected to the input control of an analog switch that is connected between the common bus of the device and the output of the high-pass filter is parallel to the preamplifier input, and the input of the signal conditioning unit A key control switch is connected to the output of the preamplifier in parallel with the input of the recorder.

Description

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This invention relates to a high voltage technique.

The purpose of the invention is to increase the accuracy and reliability of measurements.

Figure 1 presents the block diagram of the proposed device in Fig, 2 - generated signals.

The device for measuring partial bits contains a source 1 of partial bits 1 connected to a high-pass filter 2 to the output of which a preamplifier 3 and a shunt switch 4 are connected. The output of the preamplifier 3 is connected to a recording device 5 and a key control signal generating unit 6.

Unit 6 contains an amplifier-limiter 7 connected to a converter of 8 two-pole pulses into unipolar pulses. The output of converter 8 is connected via two parallel branches with two inputs of an anti-coincidence circuit, one of which is a direct connection, the other contains a series-connected leveling device 9 and a unipolar limiting amplifier 10. The output of anti-coincidence circuit 11 is connected to the control input of an analog switch 4.

The device works as follows.

In the absence of a pulse, key 4 is in the open state. When pulses of partial discharges occur, the current flowing from the source of partial discharges through the high-pass filter 2 and the preamplifier 3, 4 normalizes the leading edge of impulse A during t TC for a positive pulse or for negative pulse and charges the filter capacitors. At this time, the key is open. From the output, filter 2 high-pass pulse

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through the pre-amplify 3 enters the registering device 5 and at the same time the block 6 generating key control signals. In block 6, the signal is amplified

amplifier-limiter 7 and is fed to the input of the converter 8 bipolar pulses into unipolar. Positive or negative pulses are converted into pulses of the same (positive) polarity B and fed through two parallel branches to the inputs of the anti-coincidence circuit 11. By one branch impulse B directly

5 is fed to the input of the anti-coincidence circuit 11, differentiated by the differentiating device 9 in the form of expo-potential double-polar impulses to the input of the unipolar amplifier 10. In the unipolar amplifier 10 the negative pulses are cut off, and the positive ones are amplified to G logical 1 arrives at the second

5 input circuit 11 anti-matches. In the anti-match scheme, pulses are logically multiplied by an algorithm

Thus, the pulse D appears at the moment of time t, ends at the moment t and acts on the key 4 for a time equal to the duration of the cutoff of the pulse A, At this moment tj the key 4 turns on and shunt

It drives the output of the filter. Shunting

the filter occurs during the generation of the outburst, the energy of the discharge is effected on the internal resistance of the source 1 of the partial bits, which is many times greater than the resistance of the public key 4.

There is a quick charge neutralization. The output of the filter is significantly reduced, which leads to

to improve the accuracy and reliability of measurements.

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FIG. 2

Claims (1)

DEVICE FOR MEASURING PARTIAL DISCHARGES, containing a partial discharge source connected to a high-pass filter, the output of which is connected to a pre-amplifier, and to the output of the preliminary amplifier - a recording device that differs. the fact that, in order to increase the accuracy and reliability of measurements, into it. an analog key and a key control signal generating unit were introduced, which contains an anti-coincidence circuit, an amplifier-limiter and a bipolar to unipolar pulse converter connected in series with it, the output of which is connected through two parallel branches with two inputs of the anti-coincidence circuit, one of the branches is a direct connection, the other the branch contains in series a differentiating device and a unipolar amplifier-limiter, while the output of the anti-coincidence circuit is connected to $ analog-home control of a key which is connected between the common bus and the output device highpass filter across the input preamplifier, and input key unit for generating control signals is connected to the output of the preamplifier input parallel recording device. I