The digital, combined under-frequency and over-frequency relay type RMF-112D forms part of a complete DEIF series of relays for protection and control of generators. The relay is type-approved by major classification societies and is applicable to both marine and land-based installations. The RMF-112D is applied for protection against under-frequency and over-frequency by supervising the frequency (of generators) in single phase and 3-phase networks. The relay measures the voltage between two phases or between one phase and the neutral. To avoid unwanted under-frequency alarms, the RMF-112D relay is not activated until the measuring voltage exceeds 60 % of Un. If either the under-frequency or over-frequency exceeds its set point, its associated output is activated. The set point values are set on the front of the relay by means of potentiometers. If exceeded, a fault signal is generated, and the associated yellow LED is lit. When the set point is exceeded, the associated timer starts and will run as long as the fault condition prevails. The delay does not depend on the exceeding of the set point. If the fault disappears, the timer is reset. When the timer expires, the contact is activated and the associated red LED is lit. The RMF-112D is provided with two outputs: - f< a minimum contact (normally energised or normally de-energised) - f> a maximum contact (normally energised or normally de-energised) The contacts may be set to open or to close on activation. Borna Niroo Karan (Bornika) is the exclusive agent of DEIF in the fields of consultation , sales and distribution of power industry products including Frequency relay products .
Download catalog file: Frequency relays, RMF-112D 421 KB