SU1641704A1 - Control device for electrical equipment explosion protection system - Google Patents

Abstract

The invention relates to shipbuilding, in particular, to explosion protection devices for electrical equipment installed in hazardous areas. The purpose of the invention is to improve serviceability and reduce labor intensity of operation. The device contains source 1 of protective gas including main and backup fans 2 and 3 of protective gas connected by a gas pipeline 4 the protective equipment filled with protective gas 5 installed in the hazardous area 6. The electrical equipment shell 5 has a pressure sensor 8 and pre-purge valve 9, equipped with a pressure sensor 10, connected via a control and blocking unit 11 with a detector 12. In unit 11, a time relay, an intermediate relay and an electrical switch are installed, which are connected in electrical circuit with pressure sensors 8 and 10, a detector 12 and control circuit of the protective gas source 1. 3 silt

Description

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Claims (1)

Claim The control device of the explosion protection system of electrical equipment, containing a control circuit of a shielding gas source, a pre-start purge valve and a contact pressure sensor electrically connected to the detector through a control and blocking unit, which includes a time relay, an electric equipment switch and four intermediate relays, the first of which is included in the circuit opening contact of the pressure sensor, and the third in the circuit of the time relay contact closing with time delay, the first closing contact is included in the power circuit of which the cycle of the third intermediate relay, while the closing contact of the fourth intermediate relay is included in the control circuit of the electrical equipment switch, and the power circuit of the detector includes the closing contact of the first intermediate relay, in parallel with which the second closing contact of the third intermediate relay and the NC contact of the fourth intermediate relay are connected, differing the fact that, in order to improve serviceability and reduce the complexity of operation, the pre-start purge valve and is equipped with a pressure sensor, the fourth intermediate relay is connected to the opening contact circuit of the third intermediate relay through the third making contact of the third intermediate relay, and the second intermediate relay is included in the making contact circuit, the closing contact of which is connected in parallel with the first closing contact of the third intermediate relay, the opening contact and the fourth making contact which are included respectively in the control circuit of the shielding gas source and in series with the make contact of the fourth intermediate th relay - a switch in the control circuit elekrooborudova5 Nia and make contact last included in the feed circuit of the first intermediate relay. Fig.?