6
Instruction Booklet IB02402001E
December 2010
Instructions for the Eaton Type
MPCV Network Protection Relay
EATON CORPORATION www.eaton.com
For more information visit: www.EatonElectrical.com IB02402001E
Instruction Bulletin
Page
6
Effective: September 2004
Instruction for the
Cutler-Hammer Type MPCV
Network Protection Relay
ST ML=ON
The ST ML=ON refers to the straight line master line setting.
This is the traditional master line which has a slope of 7 to
7.5 degrees (refer to
Figure 14
). Entering the large arrow up
and down key will change the ST ML=ON to ST ML=OFF.
Selecting the straight master line to equal off changes the
closing characteristics to the circular master line (refer to
Figure 15
). The circular master line allows the relay to close
at the same ML setting and at any angle between the LH MH
and PL settings. It is useful in those areas where the network
load is lighter than normal. This function permits the relay to
call for a close at lower loads while assuring the watt flow
will be into the network. Make your selection and enter the
NEXT key to view the next line.
ML=1.00V
This is the overvoltage phasing voltage, which is the differ-
ence between the transformer and network line to ground
voltages. This value represents the in-phase or 0 degree
value. The Master Line value can be changed at 0.20 volt
increments by entering the large up or down arrow keys.
Adjustments of 0.10 volt can be obtained by entering the
small up or down arrow key.
Make your selection and enter the NEXT key to view the
next line.
PL=-5º
This refers to the Phasing Line adjustment (refer to
Figure 14
and
15
). The phasing line can be changed from +5 to -25
degrees in 5-degree increments. Make your selection and
enter the NEXT key to view the next line.
LH ML=90º
(viewed only if ST ML=OFF)
The Left Hand Master Line can be viewed whenever the ST
ML=OFF, or the circular master line is enabled.
Figure 15
shows the Left-Hand Master Line adjustment region from
+60 to +90 degrees. This is selectable by using the small
arrow up and down keys in 5-degree increments for small
arrow and 10-degree increments for large arrow. Make your
selection and enter the NEXT key to view the next line.
RT=.20%
The Reverse Trip setting is calibrated at 180 degrees and is
selectable in 0.20% increments when using the large up and
down arrow keys and in 0.01% increments when using the
small up and down arrow keys. Refer to
Table 5
Trip Amper-
age as a Function of CT Primary from .05 to 5% on
Page 15
.
This table tabulates the most active trip region selections.
The RT setting is referred to as the sensitive trip region. Make
your selection and enter the NEXT key to view the next line.
TD=0
This represents the Time Delay setting which is divided into
three separate areas.
1. TD=0 With a zero setting, there is no time delay
associated with tripping. Sets relay to respond on RT set-
ting only.
2. TD=0.25 to 300 seconds. This is selectable in 20-sec-
ond increments when using the large up and down arrow
keys and is selectable in 0.25-second increments when
using the small up and down arrow keys. This represents
time delay on tripping in seconds. Sets the relay to
respond on RT setting with Time Delay and respond
instantaneously to OC setting.
3. TD=INF This is selectable from the TD=0 mode by
entering the small arrow down key. Sets the relay to non-
sensitive tripping and respond instantaneously to OC set-
ting only. It overrides the sensitive trip setting.
Make your selection and enter the NEXT key to view the
next line.
OC=0
This represents the overcurrent (OC) instantaneous pickup
point of the relay. There are two selections possible in this
mode, which are:
1. OC=0
There is no instantaneous overcurrent pickup point
selected. This can be the situation whenever the TD
setting equals 0.
2. OC=1 to 250%
This is selectable in 20% increments by entering the
large up and down arrow keys or in 1% increments by
entering the small up and down arrow keys.
Note: If TD=INF or if TD=0.25 to 300 seconds, you will be directed
to make an OC setting other than 0.
You can also select an OC setting other than 0 if just the sen-
sitive trip range (RT) is being used. The sensitive trip range
spans from .05% to .5%. This can be further extended by
engaging the OC setting. Make your selection and enter the
NEXT key to view the next line.
WV=OFF
The relay can be selected to engage the watt-var trip charac-
teristic by entering the large up arrow key, changing the
WV=OFF to WV=ON. The new “Boomerang Watt-Var” trip
curve is shown in Figure 5. Note that the new curve permits
balanced 3-phase tripping under reverse magnetizing condi-
tions, while at the same time can handle phase unbalanced
conditions which can exist on overhead primary circuits.
Again, the OC setting can be engaged which will add a
non-sensitive trip region to the tripping characteristic.
Make your selection and enter the NEXT key to view the
next line.
PUMP PROTEC= OFF
The MPCV relay incorporates an innovative system where by
the operator can select to protect the network protector
breaker from pumping. If the PUMP PROTEC=OFF, then
there is no pump protection installed. Entering the large up
and down arrow keys will change the PUMP PROTEC=ON.
If the PUMP PROTEC=OFF, and the NEXT key is entered, the
screen displays INCOM ADR, which starts the communication
information. See below. If the PUMP PROTEC=ON and the
NEXT key is entered, BRK CYCLES=3 is displayed. This is
selectable from 3 to 20 cycles. If the NEXT key is entered,
the next line displays PUMP TIME=30, which is selectable
from 30 to 300 seconds. If the breaker opens and closes its
contacts equal to or exceeding the BRK CYCLES in the speci-
fied number of seconds as defined by the PUMP TIME, the
breaker will trip and lock open.
WARNING
THE TD=INF WILL DISABLE THE SENSITIVE TRIP MODE AND
WILL ONLY PERMIT TRIPPING OF THE NETWORK PROTECTOR
AT THE SELECTED OC VALUE.
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