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DDCA / DDCB - DIFFERENTIAL DC CURRENT RELAY, / DC Earth Leakage Relay
The differential DC current relay is designed to monitor IT systems for insulation deterioration. The DDCA is able to selectively indicate faults in branched systems. In addition to this it shows if the fault is related to the positive or the negative wire for easy maintenance. Used with only one wire through the sensing core, it can monitor a circuit for connectivity and function. If the DC current drops below the set value, the relay will trip. This is another key feature as the DDCA allows, up to the cable capacity, AC and DC Amps to flow under normal conditions without having the usual voltage drop and heat from a shunt resistor.
Datasheet DDCA
Datasheet DDCB
Products online DDCA + DDCB
DDEA / DDEB - EARTH LEAKAGE MONITOR FOR DC UNEARTHED IT SYSTEMS
The DC earth leakage relay is designed to monitor unearthed DC IT systems for insulation deterioration or faults. The DDEA, that is power supplied from the system to be monitored, is connected to earth through an active current limited circuitry, trying to keep the earth voltage at half the system voltage. If there is a leak to ground from one of the supply lines the DDEA will compensate in order to keep the earth voltage at half the supply voltage. When the compensation current rises to a higher level than the set point the relay will switch, and the DDEA will let the earth fl oat with the limited compensation current still running. This ensures that the special features of an unearthed system are still available while the fault can be found and repaired. The internal relays can be set to work in parallel for a fault or individually for faults in the positive or the negative line. In the unlikely case that there is a balanced leak from both the positive and the negative supply line it will not be detected by the DDEA.
Datasheet DDEA
Datasheet DDEB
Products online DDEA + DDEB
How to get more information?
Thiim A/S © 08/10-2018
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