DEVICE FOR PROTECTING PYROCARTRIDGE FROM FALSE TRIGGERING DURING PULSE SURGES Russian patent published in 2009 - IPC H02H1/04 G08B17/08 

FIELD: electricity.

SUBSTANCE: present invention can be used in electrical engineering for protection false triggering of fire extinguishing systems. The device has three protection stages. The first is in form of an aerial fuse with three electrodes, one of which is earthed. The second stage has induction coils and series-connected semiconductor voltage limiters, in form of TVS - bidirectional diodes or varistors or protective thyristors, the common point of which is connected to the earthed electrode of the aerial fuse. The other two electrodes are connected to the induction coils. The third protection stage has a series circuit of a diode and coils of an electromagnetic relay, and is connected to the triggering wires in parallel to the semiconductor voltage limiters. The relay contacts shunted with a resistor can be fitted in any of the triggering wires. When there is fire, trigger voltage and current are applied in opposite direction to the control voltage and current, closing the relay contacts, thus triggering the pyrocartridge.

EFFECT: equalisation of potential between triggering wires and any of the triggering wires and earth, and reduced number of elements of the circuit.

7 cl, 5 dwg