ABB PMA Instruction Leaflet

Effective: November 1999
Supersedes I.L. 41-973.5Q Dated February 1996
( ) Denotes change since previous issue
!
CAUTION
Before putting protective relays into service,
remove all blocking which may have been
inserted for the purpose of securing parts during
shipment, make sure that all moving parts oper-
ate freely, inspect the contacts to see that they
are clean and close properly, and operate the
relay to check the settings and electrical connec-
tions.
1.0 APPLICATION
Type PM Monitoring Relays provide continuous moni-
toring of a pilot-wire circuit to detect open circuits,
short circuits, grounds, and wire reversal. In addition,
transferred tripping can be effected where the PM-3,
PM-13, PMG-13 or PM-23 relays are used. Table 1
illustrates the functions available with each relay. A
10 mfd. Capacitor is supplied with each PM relay.
This capacitor provides an ac path between the two
halves of the insulating transformer secondary wind-
ings as shown in figures 25 through 31.
Any relay which has a ground detection unit (5 unit),
may have a momentary contact closure when a
ground occurs on the station battery. If the momen-
tary contact closure causes a problem, relays are
available with an auxiliary telephone relay which has
a pickup delay to eliminate this problem
All possible contingencies which may arise during installation, operation or maintenance, and all details and
variations of this equipment do not purport to be covered by these instructions. If further information is desired
by purchaser regarding this particular installation, operation or maintenance of this equipment, the local ABB
Power T&D Company Inc. representative should be contacted.
Printed in U.S.A.
ABB Automation Inc.
Substation Automation and Protection Division
Coral Springs, FL 33065
Type PM Line of Relays
For Pilot-Wire Monitoring
and Transferred Tripping
Each circuit requires the following:
At one end to introduce monitoring current
One of the following:
For ac supply
PMA
PMA-1
PM-13 or PMG-13 (ac)
At the other end to receive monitoring current (two termi-
nal line):
One PM-23 or PM-2 or PM-4
At the other ends to receive monitoring current (three
terminal line):
One PM-23 or one PM-4 or one PM-2 for each remote
terminal.
2.0 CONSTRUCTION
PM relays consist of the following:
PMA
1 Polar Alarm Unit (1)
1 Polar Ground Unit (5)
1 Tapped Transformer
1 Full-Wave Rectifier
3-4 mfd Capacitors
1 set of Potential Divider
Resistors
PMD
1 Polar Alarm Unit (1)
1 Polar Ground Unit (5)
2-4 mfd Capacitors
1 Set of Potential Divider
Resistors
Instruction Leaflet
41-973.5R
For dc Supply
PMD
PMD-1
PM-13 or PMG-13 (dc)
PMA-1
1 Polar Alarm Unit
1 Tapped Transformer
1 Full-Wave Rectifier
1-4 mfd Capacitor
1 Set of Potential Divider
Resistors
PMD-1
1 Polar Alarm Unit
1 Set of Potential Divider
Resistors