Overload relays – type RMP-111D0 pages

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