RU132213U1 - COMPACT TEST INSTALLATION FOR HIGH VOLTAGE ELECTRICAL EQUIPMENT TEST - Google Patents

Abstract

A compact test installation for testing electrical insulation of high voltage, consisting of a circuit breaker, an autotransformer, an adjustable inductor and a capacitor in the primary circuit, a resonant test transformer, a rectifier, a button, a shunt rectifier, a first current-limiting resistor, a test object, characterized in that the capacitor is shunted by a switching a device connected in series with a second current-limiting resistor to a secondary circuit and a test resonant transformer introduced a current sensor, the signal from which through the control system enters the switching device.

Description

The utility model relates to the field of electric power industry, in particular to devices for testing insulation of high-voltage electrical equipment with increased rectified voltage and increased alternating sinusoidal voltage of industrial frequency 50 Hz.

Known complete installation for testing insulation with high voltage voltage of objects of large capacity [RU, p. No. 18450, G01R 31/0, from 14.02.2001, publ. 06/20/2001], consisting of a resonant transformer with a smoothly regulating gap in the magnetic circuit, an autotransformer for regulating the input voltage, measuring instruments for controlling parameters, a switch for receiving direct or alternating voltage, the test object.

The disadvantages of the device include: the high complexity of manufacturing a test resonant transformer; its large mass; a complex mechanism for regulating the gap of the magnetic circuit, reducing the reliability of the device and the safety of personnel.

It is also known a device for testing insulation with high voltage objects of large capacity [RU, p. No. 73495, G01R 31/06, from 12/18/2007, publ. 05/20/2008], consisting of: an autotransformer; test transformer with one-piece magnetic circuit; inductor in the primary circuit; measuring instruments for monitoring parameters; operating mode switch; the test object.

The disadvantages of these devices include a limited scope, since they are intended only for testing the insulation of high-voltage electrical equipment of large capacity.

The advantage of the above devices is that in these circuits when the breakdown begins, the parameters of the resonant circuit are upset, the resonance in the circuit disappears, the high test voltage applied to the test object disappears.

A device for testing insulation with high voltage [RU, p. No. 105468, G01R 31/06, from 14.02.2011, publ. 06/10/2011], taken as a prototype consisting of the following basic elements: circuit breaker; autotransformer; adjustable choke and capacitor in the primary circuit; test resonant transformer; rectifier; button bypass rectifier; current limiting resistor of the test object.

The advantage of the above device is its wide field of application, since it can work with electrical equipment, the insulation of which has both a large and a small capacity.

The disadvantage of this device is the lack of protection of the test object, since resonance is formed in the primary circuit and a change in the capacitance of the test object does not affect the parameters of the resonant circuit, and therefore, a high test voltage is applied to the object at the time of breakdown.

The technical objectives of the proposed utility model are to provide insulation protection at the test object during testing, and to increase the safety of the personnel performing the tests.

The technical result is achieved by the fact that in a known installation comprising a circuit breaker, an autotransformer, an adjustable inductor and a capacitor in the primary circuit, a resonant test transformer, a rectifier, a button, a shunt rectifier, a current limiting resistor, a test object, a capacitor in the primary circuit is shunted by a switching device connected in series with a current-limiting resistor, and in addition, a sensor is introduced into the secondary circuit of the test resonant transformer current, the signal from which through the control system enters the switching device.

Figure 1 presents the proposed device for testing insulation with high voltage, consisting of a circuit breaker 1, an autotransformer 2, an adjustable inductor 3 and a capacitor 4 in the primary circuit, a resonant test transformer 5, a rectifier 6, a button 7, a shunt rectifier 6, the first current-limiting resistor 8, a second current-limiting resistor 9, a test object 10, a current sensor 11, a switching device 12, and a control system 13.

The device operates as follows. After turning on the circuit breaker 1, power is supplied to the primary winding of the transformer 5. Using an adjustable inductor 3, the value of its inductance and, accordingly, the inductance of the entire circuit is selected for resonance in the primary circuit. Then, with the help of an autotransformer 2, the required test voltage is created on the test object 10. When the insulation breakdown on the test object 10, the current in the secondary circuit increases sharply, and the signal from the current sensor 11 is supplied to the control system 13, which controls the switching device 12, which shunts the capacitor 4, which leads to the disappearance of resonance in the primary circuit and allows you to maintain in working condition the isolation of the test object 10.

This technical solution allows the device to work with objects of any capacity, in addition, the setup time of the circuit to resonance is reduced, insulation is protected at the test object during testing, and the safety of the personnel performing the tests is increased.

Claims (1)

A compact test installation for testing electrical insulation of high voltage, consisting of a circuit breaker, an autotransformer, an adjustable inductor and a capacitor in the primary circuit, a resonant test transformer, a rectifier, a button, a shunt rectifier, a first current-limiting resistor, a test object, characterized in that the capacitor is shunted by a switching a device connected in series with a second current-limiting resistor to a secondary circuit and a test resonant transformer introduced a current sensor, the signal from which through the control system enters the switching device.

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