Table of Contents
Advertisement
1MDU07205-YN rev. F
4.4
4.5
REF601 CEI
User's manual
Outputs & Inputs
The relay has pre-defi ned output contacts. The REF601 has trip / breaker open
command output contact and additional NC trip output command which opens for
minimum 200 msec or till the fault persists. The relay has 2 nos. signaling contacts
for over current trip and earth fault trip indication. Relay has 1 no. signaling contact
for unit ready indication.
The relay has 2 nos. binary input with wide aux. voltage band of 24V-240V AC/DC for
remote trip and remote reset. Applying a valid voltage input to remote trip input, it will
generate a trip command directly irrespective of current fl owing in system. While by
applying the proper voltage input to reset input, will reset all the indications to normal
state. Relay indications include protection start, protection trip, phase fault trip Ip,
Earth fault trip Io and relay ready / IRF LED's.
Breaker control & Trip command operation
Relay REF601 supports the breaker control operation. The control operation can be
done from additional control push-buttons provided on relay front or from remote
through additional 2 nos. binary inputs. The close / trip control command to the
breaker will be generated by respective output contacts.
REF601generates the trip in case of remote trip command, protection trip or breaker
open command as shown Figure below.
Remote Control
(BI)
Protection Stage
Breaker Open
Fig. 4 – Various trip arrangement available in feeder protection relay REF601
Relay trip command operates the potential free contact from CLOSE position to
OPEN for minimum of 200msec, in case of valid trip condition. The complete se-
quence of Trip operation is shown on next page.
At power-on, relay will perform internal health check and then change the trip
contact to CLOSE. In case of healthy trip (After set time), this CLOSE contacts
will changeover to OPEN (till the fault persist) and again will become CLOSE. Trip
indications are still ON and they reset only with valid reset command. There are four
reset commands
-Applying a proper voltage input to the Reset input terminals (XK4.3–XK4.4) as
mentioned above.
-Through Menu Navigation
-Through proper command via communication port (XK3)
-Through "UP" + "Enter" key combination
In case of power off without reset command, at next power-on, trip signaling we
get restored. In case of power OFF condition and Internal relay fault condition, trip
contact will be in open condition.
Protection Functions
Trip Circuit with
Trip
Managment
Breaker Open
(Contact Closes)
(contact opens )
"NO" relay
27
Advertisement
Table of Contents
