RMC 131d Data Sheet 4921240104 Uk
RMC 131d Data Sheet 4921240104 Uk
RMC 131d Data Sheet 4921240104 Uk
2. Technical information
2.1 Technical specifications and dimensions.................................................................................................................................................................... 5
2.1.1 Technical specifications................................................................................................................................................................................................... 5
2.1.2 Settings and indication..................................................................................................................................................................................................... 6
2.1.3 Connections/dimensions (in mm)................................................................................................................................................................................ 6
3. Ordering information
3.1 Order specifications and disclaimer............................................................................................................................................................................... 8
3.1.1 Available variants............................................................................................................................................................................................................... 8
3.1.2 Order specifications.......................................................................................................................................................................................................... 8
3.1.3 Disclaimer..............................................................................................................................................................................................................................8
The protective differential current relay type RMC-131D forms part of a complete DEIF series of relays for protection and control of
generators, and is primarily designed for marine applications. Also available are short circuit relays (RMC-111D), combined short
circuit and over-current relays (RMC-122D) and double over-current relays (RMC-132D).
The RMC-131D is type-approved by major classification societies and is applied for protection of for example generators in 3-phase
networks against leakage currents.
The relay compares the differential current of each of the three phases, providing an RMS measurement at sinusoidal currents.
In order to obtain a short response time on a fault condition, the measurement is based on peak values.
The differential currents are obtained by connecting the external current transformers for each winding in parallel with inverse
polarity.
The measurement is not stabilised, implying that the relay contact is activated for disconnection of the supervised unit when the
differential current of the individual phases exceeds its set point, irrespective of the amperage of these.
The three differential currents are measured by the relay and the highest of these is selected. If this exceeds the 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.
When the set point is exceeded, its timer starts and will run as long as the fault condition prevails.
If the fault disappears, the timer is reset. When the timer expires, the contact is activated and the associated red LED is lit.
The RMC-131D is provided with one relay coil with two maximum contacts. The relay can be configured either to normally energised
or normally de-energised. The contacts may be set to open or to close on activation (same function on both contacts).
An auxiliary supply failure will not result in an unwanted activation of the contact.
The contact can be locked in its warning position, even if the input currents return to normal (add "L" to contact type in order
specifications, if this is required).
Hysteresis
In order to avoid "chatter" on the relay contacts the contact functions are provided with a hysteresis, that is a difference of 2 % of full
scale between energising and de-energising of the relay.
Power-up/power-down circuits
The RMC-131D is provided with a 200 ms power-up circuit, ensuring the correct function of the relay on connection of the auxiliary
voltage.
INFO
Normally energised contacts are not activated (contact does not open/close) until 200 ms after connection of the auxiliary
voltage.
Likewise, the RMC-131D 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.
0.3-0.4-0.5-0.6-0.8-1.0-1.3-1.5-2.0-2.5-3.0-4.0-5.0 A AC
Meas. range (In)
UL/cUL Listed: 0.4 to 5.0 A AC
Frequency range 40 to 45 to 65 to 70 Hz
4 × In, continuously
Max. input current 20 x In for 10 s (max. 75 A)
80 × In for 1 s (max. 300 A)
Contact B, contact C: Normally energised ("NE"), or normally de-energised ("ND") with or without latch
Contact type
circuit ("L")
Temperature drift Set points: Max. 0.2 % of full scale per 10 °C/50 °F
Galv. separation Between inputs, outputs and aux. voltage: 3250 V - 50 Hz - 1 min.
The Uni-line components are approved by the major classification societies. For current approvals see
Type approval
www.deif.com or contact DEIF A/S.
Setting of LED/relay
Time delay:
(0 to T1) in seconds Contact is activated and red LED lit after the timer has expired.
0 to 1/0 to 5/0 to 10 s
The relay is furthermore equipped with a green LED marked "POWER" for indication of power ON. Once the relay has been
mounted and adjusted, the transparent front cover may be sealed to prevent unwanted change of the setting.
INFO
Current transformers with the same characteristics must be used on both sides. The cable burden must be the same on
both sides. Current transformers must be used for RMC-131D only.
1 3 6 7 8 13 14 15
X1 X2 B C
RMC-131D
L1 L2 L3
23 24 26 27 29 30
L1 S1 S2 S1 S2
P1 P2 UNIT
P1 P2
L2 S1 S2 S1 S2
UNDER
P1 P2 PROTECTION P1 P2
L3 S1 S2 S1 S2
P1 P2 P1 P2
85.0
4.5
75.0
61.0
99.7 110.0
INFO
There are no additional options to the standard variant.
Variants
Mandatory information
Variant
Item no. Type Measuring current (In) Relay Time delay T1 Supply voltage
no.
Example:
Mandatory information
Variant
Item no. Type Measuring current (In) Relay Time delay T1 Supply voltage
no.
3.1.3 Disclaimer
DEIF A/S reserves the right to change any of the contents of this document without prior notice.
The English version of this document always contains the most recent and up-to-date information about the product. DEIF does not
take responsibility for the accuracy of translations, and translations might not be updated at the same time as the English document.
If there is a discrepancy, the English version prevails.