SU1422164A1 - Device for checking high voltage at conducting members of three-phase electric installation - Google Patents

Abstract

The invention relates to the control of the presence of a high ex. on the current-carrying elements of a three-phase installation, the purpose of the invention is to increase the reliability of control by means of the introduction of a capacitor 4, which ensures that the presence of indicators 6 of the voltage or the indicator 7 of the protective grounding is activated depending on the relative position of the switching device 9 and the protective ground 14. Capacitor I and I The indicator 5 for the presence of voltage indicates the presence of voltage in a three-phase network, capacitors 2 and 3 provide the connection of indicators 6 and 7 with the current-carrying parts of the electrodes anovki. Normally closed contact (L

Description

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The invention relates to the control of the presence of high voltage on the current-carrying elements of three-phase electrical installations,

The aim of the invention is to increase the reliability of the control.

The drawing shows the scheme of the device,

i device for controlling high

(Voltages on current-carrying elements of a three-phase electrical installation include capacitors 1-4, indicators 5 and 6 of the presence of voltage, indicator 7 of switching on the protective grounding, the first lead of the capacitor 1 is connected to the first phase 8 of the current-carrying element before the disconnecting switching device 9, the second lead of the capacitor 1 is connected to the first output of the indicator

5 voltage level, the second terminal of which is connected to ground 10, the first terminal of capacitor 2 is connected

with the first phase 8 of the current-carrying element to the switching-off switching device 9, the second lead of the capacitor 4 is connected to the first lead of the indicator

6 voltage levels, the second terminal of the voltage presence indicator 6 is connected to the second terminals of the capacitors 2 and 3, the first terminal of the capacitor

2 is connected to the second phase 11 of the current-carrying element after the switching device 9, the second terminal of the capacitor 3 is connected to the third phase 12 of the current-carrying element after the switching device 9, the indicator 7 for switching on the protective ground is connected parallel to the indicator 6 for the presence of voltage through a normally closed contact 13 voltage indicator 6; safety ground 14 is connected to phases 8, 11 and 12,

Capacitors 1-4 can be made in the form of high-voltage capacitors or standard insulators, which use a capacitor between the flanges. The trigger setting of indicator 7 is lower than the trigger setting of voltage presence indicator 6.

The device works as follows.

If there is a voltage on the current-carrying elements (phases 8, 12 and P) than the capacitors 1-4, current flows, which leads to the operation of the indicators 5 and 6 of the presence of voltage.

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The device is the operation of the voltage presence indicator 5 and the fixation of the absence of voltage by the voltage presence indicator 6. When the switching device 9 is switched off, the current through the circuit capacitor 4 - voltage indicator 6 - capacitors 2 and 3 does not flow, therefore the voltage indicator 6 does not work. When the switching device 9 is disconnected, the pins 13 of the voltage indicator 6 is closed. When the protective grounding 14 is turned on, the current flows through the capacitor 4, the voltage indicator 6, the protective grounding indicator 7, capacitors 2 and 3, protective groundings 14, grounding 10, Indicator 7 the safety ground is turned on, and the voltage presence indicator 6 does not work, because the response threshold of the voltage indicator 6 is higher than the response threshold of the safety ground indicator 7, Because of the presence of voltage on current-carrying elements (phases 8, 11, and 12), capacitors 2-4 are connected to line voltages, and when the switching device 9 is disconnected and protective grounding 14 is turned on, capacitors 2-4 turn on phase voltages, therefore in the first case the amount of current is sufficient to trigger a voltage indicator 5, and in the second case it is sufficient to trigger a protective grounding indicator 7, but not sufficient to trigger a voltage indicator 6,

Claims (1)

Invention Formula A device for monitoring high voltage on current-carrying elements of a three-phase electrical installation, containing three capacitors, two voltage indicators, a protective grounding indicator, the first pin of the first capacitor connected to the first phase of the current-carrying element before the switching device, the second end of the first capacitor connected to the first the output of the first indicator of the presence of voltage, the second output of which is connected to grounding, so that, in order to increase the reliability control, entered the fourth capacitor, the first 31422164 the output of which is connected to the first wiring element after the switching device of the first capacitor, the second one, the second output of the third condenser — the output of the fourth capacitor of the connector is connected to the third phase of the current source with the first output of the second indication element the second output device, the turn-on indicator, the second indicator of the presence of a direct protective ground connection is connected to the second parallel indicator, the second and the third indicator of the presence of a second and third capacitor In other words, the normally closed end of the second capacitor is located on the second presence indicator and is connected to the second phase of the current-carrying current:;