SU449320A1 - Device for removing the curve of the restoring electric strength of the arc gap of arc-suppressing devices of electrical apparatus - Google Patents

Description

The invention relates to the field of low-voltage hardware and can be used in the study of electric arcing devices aiinaf) aTOB. A device is known in which a pulse generator, a high-voltage step-up transformer and a discharge diode connected in series with the high-voltage winding of this transformer are used to remove the regenerative electric strength of the arc gap. The drawback of the device for removing the curve of restorative efficiency is the absence of voltage across the test gap in the time interval between pulses, which increases the measurement error. The purpose of the invention is to reduce the measurement error due to the maximum conditions in the arc gap to -naturally, when you remove your resetting curve for each disconnecting strength; winding KOTOpoiX) is connected in parallel to the auxiliary and test contacts. This makes it possible to bring the conditions in the arc gap after a current break to a natural one and therefore to increase the measurement accuracy. The scheme of the described device shown in the drawing. The proposed device contains an i-investigated gap G, auxiliary contacts 2, load resistance 3, separating voltage transformer 4, high-frequency generator 5, high-voltage transformer 6, high-voltage diode 7, additional resistance 8, shunt-hing co-polar) 1 and 9, shyntltpyyii yl J "capacitance Y. High-voltage transformer G and peiaselective transformer 4 is connected. consistently. A high-voltage transistor (| k) rmator 6 is connected to a high-frequency voltage generator S, and an isolation one; transformer 4 is connected to series-connected test 1 and auxiliary 2 contacts. The test ° circuit includes - 8 and a high voltage (DIODE 7) series-connected with transformers | 4 and 6: DIODE 7. Parallel to the primary winding of the transformer 4 are connected bypass: resistance 9 and capacitance 10. I Device for removing the curve of the recovering electric strength of the arc gap, extinguish The electrical devices operate as follows: When the contacts in question 1 are opened, an electrical arc arises on them. At the moment the arc current decreases to zero, the auxiliary The contacts 2 separate the studied gap 1 from the power source and from the load 3. After the arc current on the series-connected contacts 1 and 2 is disconnected, the voltage recovers, the rate of rise and ammunition of which is reduced by means of shunt resistors 9 and capacity 1 O. Restorative voltage of industrial frequency applies with to the studied gap 1 by means of an isolation transformer 4. The secondary winding of the isolation transformer 4 is connected in series with the secondary winding of the high-voltage Transformer 6, Therefore, on the studied: the interval is supplied by a returnable one of the industrial part with imposing on it unipolar polarization pulses, the frequency of which is followed; They are set using generator 5. When the voltage across the gap reaches the breakdown voltage, the voltage drops across the gap, and the discharge current flows through the gap. The magnitude of the current is limited by the resistance 8. The nature of the voltage variation in the gap is recorded using oscillops. Subject of the Invention A device for taking a curve of the restoring electrical strength of an arc gap of an arc-suppressing device of an electrical apparatus after a current break in them, containing a high-voltage transformer, high-frequency generator A rectifying diode, characterized in that, with a measuring accuracy, a separation transformer, fed from the source, is introduced into it. The industrial frequency generator, the primary winding of which is connected in parallel with the contacts of the arc gap under study, and the secondary winding is connected in series with the secondary winding of the high-voltage transformer.

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