Functional Test; What To Do In Case Of Gas Accumulation - COMEM eBR Bedienungsanleitung

Functional test

The test can be performed with the help of a test key (me-
chanically) or by a special test pump (pneumatically).
Perform the test while the eBR Electronic Buchholz Relay
is filled with insulating liquid up to the required level.
Mechanical testing by test keys
Volume alarm verification
Proceed following the actions
• Remove the higher cap nut (C/1)
• Press the test key (C/2) (check of level alarm)
• Verification of correct function from the control room
• Release the test key
• Fit and tighten the higher cap nut.
Trip verification
(1)
• Proceed following the actions
• Remove the smaller cap nut (D/1)
• Pull toward the higher position the test key (D/2) (check
of trip)
• Verification of correct function from the control room
• Push the test key (D/2) to re-arm the trip
• Fit and tighten the higher cap nut
Figure C
Figure D
Note
(1) Please consider that for all the wiring diagram the FLOW VANE ALARM is not
testable by the test keys. For the "I" wiring diagram the not testable switches are:
FLOW VANE ALARM and LEVEL TRIP.
(1)
1
2
1
2
This notes give important or specific information concerning the
equipment or as to work with the equipment.
Pneumatic testing by pneumatic valve
This is performed by injecting air using a pump (furnished
by COMEM on request as an accessory kit), causing the oil
level inside the eBR to drop down and actuate the alarm
float.
Proceed as follows when using the kit:
• Remove plug (E/2), screw valve (E/3) and relative nipple
on relay valve (E/1)
• Remove cap (E/4), insert pump (E/5) using the
threaded connection and turn the lever to OFF, inject air
as necessary to activate internal mechanisms.
• To restore the oil level and simultaneously bleed out
internal air remove plug (E/7) and open ball cock (E/6).
• After these procedures close cock (E/6) and plug (E/7),
remove pump (E/5) and relative accessories (E/3) and
(E/4) and close valve (E/1) using plug (2/H).
3
2
7
6
Figure E
What to do in the case of
gas accumulation
In case of alarm, the gas should be checked immediately
to determine the cause of the fault and avoid additional
damages. To this end, withdraw the gas from the eBR and
analyze it. For gas sampling and transport it is recommen-
ded to use the "Gas Sampling device".
NOTE
4
1
5
7