RU156457U1 - INSTALLATION FOR TESTING PROTECTIVE EQUIPMENT - Google Patents

Abstract

Installation for testing protective equipment, consisting of an autotransformer, an inductor and a capacitor in the primary circuit, a test transformer, a current-limiting resistor of the test object, characterized in that the inductor is connected in parallel to the primary winding of the test transformer, then an automatic discharge rod with discharge resistance is installed in the design of the test transformer 60-90 kOhm, then a unified display system is installed in the control unit, which allows During high-voltage tests, set the protection threshold for voltage, current and time, as well as measure the current through the product and the voltage at the test facility.

Description

The invention relates to the field of measurement technology, in particular to devices for testing protective equipment used in electrical installations with an increased alternating sinusoidal voltage of an industrial frequency of 50 Hz.

A known installation for testing protective equipment [RU, p. No. 45821, G01D 21/00, H01H 73/00, H02H 3/10 from 06.09.2004, publ. May 27, 2005], consisting of the following main elements: a bath with water, high voltage electrodes, a high voltage transformer, an autotransformer, a blocking switch, a test voltage blocking circuit, a current control circuit with a measuring transformer, a control panel, a voltage measurement circuit.

The disadvantages of the device include the lack of automatic shutdown of high voltage during a short circuit or breakdown of the test object, as well as a unified system of indication and control of the device.

The closest technical solution is a device for testing insulation with high voltage [RU, p. No. 105468, G01R 31/06, from 02/14/2011, publ. 06/10/2011], consisting of: an autotransformer, an adjustable inductor on the low voltage side, a capacitor, a test resonant transformer, a current-limiting resistor, a test object.

The disadvantages of the device include the lack of protection of the test object, as well as a complex mechanism for regulating the gap of the magnetic circuit of the throttle, which reduces the reliability of the device and the safety of personnel.

The technical objectives of the proposed utility model are to ensure the protection of the test object, expand the functionality and increase the safety of the personnel performing the tests.

The task is achieved by the fact that in a known installation comprising a circuit breaker, an autotransformer, an adjustable inductor on the low voltage side and a capacitor in the primary circuit, a resonant test transformer, a test object, the inductor is connected in parallel to the primary winding of the test transformer, then the test transformer is installed in the design automatic discharge rod with a discharge resistance of 60-90 kOhm, then a single unit with an indication system that allows, before carrying out high-voltage tests, to establish a threshold for the protection by voltage, current and time, as well as measure the current through the product and the voltage at the test facility.

In FIG. 1 and FIG. 2 shows the proposed device for testing protective equipment with high voltage, consisting of a circuit breaker 1, the Start / Stop button 2 with a switching device 4, an autotransformer 3, a capacitor 5 and a reactor 6 in the primary circuit, a test transformer 7, a current limiting resistor 8, a block control and indication 14, current meter 9, voltage divider in the secondary circuit 10, test object 12, high voltage electrodes 16, ground terminals 17, automatic ground rod for high voltage lead yes 11 with a discharge resistance of 60-90 kOhm 13, a bath of water 15, a tank lid 18 and a viewing window 19.

The device operates as follows. After turning on the circuit breaker 1, power is supplied to the control and display unit 14, then it sets the threshold value for the protection of current and voltage, as well as the time of the test. When the “Start / Stop” button 2 is pressed, the voltage from the control unit 14 is supplied to the resonant circuit, to which the primary winding of the test transformer 7 is connected. Next, using the autotransformer 3, the required test voltage is generated on the test object 12. In case of a short circuit, the breakdown of the test object 12 , exceeding the limit values of current, voltage and test time, in the control unit 14 automatically at the time of measuring current, voltage and time, the control system turns off the high voltage supply and It gives a signal to the discharge switch rod 11.

This technical solution allows the device to perform the following functions:

1. Measurement of current through the product and voltage at the test facility;

2. Perform automatic protection in case of short circuit or breakdown of the test object;

3. To automatically shut off the supply of high voltage when exceeding the limit values of current, voltage and test time;

4. Ensure the safety of the personnel performing the tests.

Claims (1)

Installation for testing protective equipment, consisting of an autotransformer, an inductor and a capacitor in the primary circuit, a test transformer, a current-limiting resistor of the test object, characterized in that the inductor is connected in parallel to the primary winding of the test transformer, then an automatic discharge rod with discharge resistance is installed in the design of the test transformer 60-90 kOhm, then a unified display system is installed in the control unit, which allows During high-voltage tests, set the protection threshold for voltage, current and time, as well as measure the current through the product and the voltage at the test facility.

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