Deif uni-line Series, RMC-142D Installation And Start-up Instructions Manual

Installation and start up instructions

Stator Earth Fault Relay RMC-142D

uni-line

4189340158C (UK)

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Earth fault protection: iE>> and iE>

Built-in filter for 3rd harmonic

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LED indication of fault condition

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Timer controlled tripping

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LED indication for activated relay

35 mm DIN rail or base mounting

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DEIF A/S Tel: [phone]
Frisenborgvej 33, DK-7800 Skive Fax: [phone]

DEIF A/S

Denmark E-mail: [e-mail]

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1. Description

This stator earth fault relay type RMC-142D forms part of a complete DEIF series (the
uni-line) of relays for protection and control of generators.

2. Label

The relay is provided with a label with the following data:

Type designation

DEIF’s order ack. No.
To be stated when contacting DEIF

Measuring current

corr. to 100% on scale

Supply voltage

Relay coupling
Shown is relay B as a
normally de-energised
relay, relay C as a
normally energised relay
with latch circuit

Note:

The relay is provided with a 200 ms power-up relay, ensuring correct

function of the relay on connection of the auxiliary voltage. Normally
energised contacts (”NE”) are not activated (contact does not open/close)
until 200 ms after connection of the auxiliary voltage. Likewise, the relay is
provided with a 200 ms power-down circuit, ensuring supervision and
maintenance of any set point exceeding for 200 ms after disconnection of
the auxiliary voltage.

Highest voltage
in relation to earth.

Installation category

Mounted current module

Scaling
(for adaption of the unit
to the measurin

(E.g. time delay(s),
special calibration)

Contact remains locked
in alarm position even though
the input returns to normal.
Latch circuit is reset by
disconnecting the supply voltage.

Distributor’s ID No.
Filled in by distributor
when customizing the unit.

current

3. Mounting instructions

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The RMC-142D is designed
for panel mounting, being
mounted on a 35 mm DIN
rail, or by means of two 4­mm screws.

Weight: Approx. 0.600 kg

Installation and start up instructions RMC-142D

The design of the relay makes mounting of it close to other uni-line units possible,
however make sure there are min. 50 mm between the top and bottom of this relay and
other relays/units.

The DIN rail must always be placed horizontally when several relays are mounted on
the same rail.

4. Connection diagram

A 2A fuse may protect the auxiliary supply connection.

The relay is protected against ESD (electrostatic electricity), and further special
protection against this during the mounting of the relay is not necessary.

5. Start up instructions

5.1 Setting and indication

Setting of LED/relay

Earth current set point:

(10…110%) of I

Time delay:

0…1/0…5/0…10 s
Earth current set point:

(2…20%) of I

Time delay:

0…20/0…60/0…120 s

At the factory the time delays are set according to the order specifications.

n

(0-T1)

n

(0-T2)

IE>> Yellow LED is lit when the set point has

been exceeded, but the output contact
has not yet been activated.

The contact is activated and the red
LED is lit after the timer has expired.

IE> Yellow LED is lit when the set point has

been exceeded, but the output contact
has not yet been activated.

The contact is activated and the red
LED is lit after the timer has expired.

4189340158C (UK)

Normally the settings of the RMC-142D are selected to ensure optimum protection of
the voltage source (generator, transformer, line), however without causing unwanted
disconnections.

Unwanted disconnections may occur in installations based on 3 or 4 CTs with the
secondary windings coupled in parallel. In connection with a short circuit between 2
phases, the short circuit current arising thereby may get so high that a differential
signal occurs because of the different saturation characteristics of the applied CTs.

In order to avoid this, the disconnection limit must be selected with due consideration
of the characteristics of the applied CTs. Alternatively a cable transformer must be
applied instead of 3 (4) current transformers.

RMC-142D is provided with a special filter suppressing the harmonic currents. This
filter suppresses the 3rd harmonic 18db (8 times), so that the latter does not influence
the measurings. However, in certain cases the 3rd harmonic is so high that the
disconnection limit must be set accordingly.

If shortest possible time delay is selected (50 ms), unwanted disconnection may occur
during synchronisation caused by a pulse signal which may be transmitted in
connection with the switching on of the voltage source and unbalance of the applied
CTs (saturation).

In order to avoid this, connection of the auxiliary voltage to the relay in connection with
the switching on of the voltage source is recommended.

The built-in power-up circuit (200 ms) will then ensure that the relay is not activated
until 200 ms after switching on the voltage source.

6. Technical specifications

Frequency range: 40…50/60…70Hz

Max. input current: 4 x I
20 x I
80 x I

Load: Max. 0.3VA per phase

Relay contact: 2 changeover switches

Contact rating: 250V-8A-2000A (AC), 24V-8A-200W (DC)

Response time: <50 ms

Galv. separation: Between input, output and aux. supply: 3250V-50Hz-1 min.
Consumption: (Aux. supply) 3.5VA/2W

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n

, continuously,

for 10 s (max. 75A)

n

for 1 s (max. 300A)

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