SU1307409A1 - Device for switching-off ability testing of high-voltage circuit breaker - Google Patents

Abstract

This invention relates to electrical measuring technology. The purpose of the invention is to expand the field of application of the device and increase the reliability of tests of a high voltage switch. The device comprises a power supply 1, comprising element 2, reactor 3, forming element 4, and a model 5 of a short-circuited line. The introduction of the power supply 7, the switching on element 8 and the switching off element 9 compensates for the effect on the restoring voltage of the distorting voltage fluctuations of the connecting line and allows to increase the range of the breaking currents. 1 il. and iP (L about 4; about with

Description

The invention relates to electrical measuring equipment and can be used in devices for testing high voltage switches for breaking capacity.

The aim of the invention is to expand the field of application of the device while increasing the reliability of the tests by compensating for the effect on the restoring voltage of the distorting voltage fluctuations of the connecting line.

The drawing shows the proposed device.

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3, enchant her. The parameters of source 7 are chosen so that the period of current oscillations through model 5 is equal to the period of oscillations of current of source I, and the first derivatives with respect to the time of these currents at the moment of reaching zero value are equal in magnitude. At the moment when the currents of sources 1 and 7 reach zero, the tested switch and tripping element 9 are triggered, the corresponding currents are broken. If the parameters of model 5 are chosen so that its frequency characteristics and lines 10 coincide, then oscillations, for example, the Device contains sequences on them after the break

but connected in a closed loop capacitor power supply 1, which includes the element 2, the reactor 3 and the forming element 4 of the restoring voltage. Series 3 of a short-circuited line and terminals 6 are connected in series to connect a test breaker connected in parallel to the forming element 4 of the restoring voltage. In parallel to the model 5 of a squirrel-cage line, series-connected power supply 7 are connected, in addition

current match in form. However, these oscillations have a phase shift of 180, since at the time of the current interruption, the voltage drops across the lines and models 3 have the opposite sign due to the opposite direction of the currents through them. After the current is disconnected by the disconnecting element 9, the pep from the elements 7-9 is disconnected from the model 5. The resulting, recoverable voltage applied to the test switch has three components. One is determined by the voltage drop on the forming element 4 from

A switching element O and a disconnecting element 9. The test current of the current flowing through it is connected to the terminals 6 and Junction 1. The other two are in character with the device through the connecting frequency-attenuated oscillations, the 10 line. They are determined by the voltage drop.

on connector line 10 and model 35 5. Since these components are the same, the device operates as follows.

In the initial position, the switching-on elements 2 and 8 are switched off, the tested switch and the disconnecting element 9 are switched on. At a given point in time, the switching-on elements 2 and 8 are triggered. From the capacitor source, the power begins to flow through the circuit: source 1, reactor 3, test switch, circuit of series-connected elements 8 and 9 and power source 7. The insignificant part of the current of source 1 branches into the forming element 4. Through model 5 of a short-circuited line, the current of source 1 practically does not flow, because the internal resistance of source 7 is much less than the resistance of model 5. The switching-on phase of source 7 is chosen so in the shunt circuit coincides with the direction of the current source 1. The current of the additional source 7 is closed through the model

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Since the shafts are in shape and have a phase shift of 180 °, then they compensate themselves for the conclusions of the switch being tested. After forming a normalized transitional restoring voltage on the terminals of the test switch without distortions introduced by the connecting line, the device finishes its work.

Thus, the proposed device allows to increase the reliability of the tests due to more accurate reproduction of the form of the restoring voltage and to expand the field of application of the device by increasing the range of switched-off currents.

Claims (1)

Invention Formula A device for testing a high voltage circuit breaker with a breaking capacity, containing a capacitor power supply including 3, enchant her. The parameters of source 7 are chosen so that the period of current oscillations through model 5 is equal to the period of oscillations of current of source I, and the first derivatives with respect to the time of these currents at the moment of reaching zero value are equal in magnitude. At the moment when the currents of sources 1 and 7 reach zero, the tested switch and tripping element 9 are triggered, the corresponding currents are broken. If the parameters of model 5 are chosen so that its frequency characteristics and lines 10 coincide, then the voltage fluctuations on them after the break five current match in form. However, these oscillations have a phase shift of 180, since at the time of the current interruption, the voltage drops across the lines and models 3 have the opposite sign due to the opposite direction of the currents through them. After the current is disconnected by the disconnecting element 9, the pep from the elements 7-9 is disconnected from the model 5. The resulting, recoverable voltage applied to the test switch has three components. One is determined by the voltage drop on the forming element 4 from the current flowing through it of the source 1. The other two are in the nature of high-frequency damped oscillations. They are determined by the voltage drop. on connecting line 10 and model 5. Since these components are the same Since the shafts are in shape and have a phase shift of 180 °, then they compensate themselves for the conclusions of the switch being tested. After forming a normalized transitional restoring voltage on the terminals of the test switch without distortions introduced by the connecting line, the device finishes its work. Thus, the proposed device allows to increase the reliability of the tests due to more accurate reproduction of the form of the restoring voltage and to expand the field of application of the device by increasing the range of switched-off currents. Invention Formula Device for testing off. a high voltage disconnecting capacity, containing a capacitor power supply including 313074094 element, reactor and forming element including element and disconnecting the coping voltage, the element, the second output of which is connected in series with the first output of the model, is a short circuit, the model of a short-circuited closed line and the first terminal for lines, terminals for connecting the test switch to the test switch, switch, the first from which is the second output of the model of short-circuited grounded, characterized by a line connected to the first output e in order to expand the power supply and the second output the application of the device with a pre-forming element of restoring the reliability of the test, in the first voltage, the first terminal is inserted in series, connected to the second terminal for power source, auxiliary switch connections.