Overload relays – type RMP-111D
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DEIF A/S Application The protective overload relay type RMP-111D forms part of a complete DEIF series of relays for protection and control of generators, and is applicable to both marine and land-based installations. Also available are reverse power relays (RMP-121D) and combined overload and reverse power relays (RMP-112D). The RMP-111D is type approved by major classification societies and is applied for protection of the prime mover against overload. This is especially required if the prime mover is underdimensioned in proportion to the AC generator. Measuring principle The relay measures all 3 phase currents and phase voltages. The TDM (Time-Division-Multiplication) principle ensures an accurate measurement of the RMS value of the power (3 x U x I x cos-), irrespective of wave form and asymmetry. The RMP-111D is available with the following couplings: 2W3 2 element 3 phase 3 wire, unbalanced load. 3W3(4) 3 element 3 phase 3 wire (4 wire), unbalanced load. If the power exceeds a set point, the output is activated. The set point value is set on the front of the relay by means of a potentiometer. If exceeded, a fault signal is generated, and the associated yellow LED is lit. Timer function 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. Relay output The RMP-111D is provided with an output with a maximum contact, either normally energised or normally de-energised. The contact may be set to open or to close on activation. Normally energised contact Recommended for land-based installations for warning and alarm purposes. In case of an auxiliary supply drop-out, the contact is immediately activated. Normally de-energised contact Recommended for marine installations for regulating and control purposes. An auxiliary supply failure will not result in an unwanted activation of the contact. Latch circuit The contacts can be locked in their warning position, even if the input power returns to normal (add “L” to contact type in order specifications, if this is required). The latch circuit is reset by disconnecting the auxiliary supply. Hysteresis In order to avoid “chatter” on the relay contacts the contact functions are provided with a hysteresis, i.e. a difference of 2% of full scale between energising and de-energising of the relay. Note: Normally energised contacts are not activated (contact does not open/close) until 200 ms after connection of the auxiliary voltage. Likewise, the RMP-111D is provided with a 200 ms power-down circuit, ensuring supervision and maintenance of any set point exceedings for 200 ms after disconnection of the auxiliary voltage. ANSI code 32 Overload relays Type RMP-111D uni-line 4921240108F • Protection of prime mover • 3 phase measurement • LED indication of alarm condition • Timer controlled tripping • LED indication for activated relay • 35 mm DIN rail or base mounting RMP-111D

Technical specifications Meas. current (In): 0.3-0.4-0.5-0.6-0.8-1.0-1.3-1.5-2.0-2.5- 3.0-4.0-5.0A AC UL/cUL listed: 0.4…5.0A AC Adjusted range: 75...100% of In (e.g. 0.4, 0.45, etc.) (lowest meas. range: 0.3A) Overload: 4 x In, continuously, 20 x In for 10 s (max. 75A) 80 x In for 1 s (max. 300A) Load: Max. 0.5VA per phase Meas. voltage (Un): (See supply voltage - AC ranges) UL/cUL listed: 57.7…450V AC Overload: 1.2 x Un, continuously, 2 x Un for 10 s Load: 2kÙ/V Frequency range: 40...45...65...70Hz Output: 1 maximum contact Contact type: Relay B: normally energised (“NE”), or normally...