CONTROLLER FOR SAFETY CURRENT WIRE OF A HEAT EQUIPMENT

CONTROLLER FOR SAFETY CURRENT WIRE OF A HEAT EQUIPMENT

Controller for a steam generator has two safety relays (10, 11) for the safety power supply (7). Parallel to the relays are shunt connections (11, 12, 14; 12, 13, 14). To test the relay switching both are switched to their off position and the voltage change monitored. If an incorrect voltage signal...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: POLITT, JOACHIMRISTIAN DR, KLATTENHOFF, JUERGEN, SCHMITZ, GUENTER
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
BLASTING
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
HEATING
LIGHTING
MECHANICAL ENGINEERING
METHODS OF STEAM GENERATION
RELAYS
SELECTORS
STEAM BOILERS
STEAM GENERATION
WEAPONS
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Beschreibung
Zusammenfassung:Controller for a steam generator has two safety relays (10, 11) for the safety power supply (7). Parallel to the relays are shunt connections (11, 12, 14; 12, 13, 14). To test the relay switching both are switched to their off position and the voltage change monitored. If an incorrect voltage signal is produced an error signal is generated. During testing the safety power supply passes through the parallel shunt connectors. To control the safety relays switching amplifiers (27, 28) are provided with a response time that is a fraction of the response time of the relays. To test the electrical control of the relay drives (21), the relays are switched in a current free manner and the voltage change monitored. An error signal is produced if there is not a sufficient voltage change. During this test the relays remain in operating mode.