Megger SR-98 - Description of Controls and Instrumentation

2
DESCRIPTION OF CONTROLS AND INSTRUMENTATION
RS232
Serial Port (
1
):
This 9-pin connector can be directly interfaced to a computer terminal, a serial data
acquisition system, or a COM port on any personal computer. Required for use of
MEGGER Software. See
RS232 Serial Data Port
for more information on the use of
the port.
Interface Terminal
(
2
):
This interface terminal provides a 10 to 30 Volts AC output to a voltage coil of a phase
angle meter. It should be noted that the voltage output is
in-phase with the SR-98 main
AC current output.
DO NOT
apply this voltage output to the current coil of a Phase
Angle Meter. Optional interface cables are available to interface with MEGGER phase
shifters models EPS and PVS-1000, see Optional Accessories in Specifications. This
interface port may also used to connect two SR-98’s together for testing the slope
characteristics of current differential relays, and to do harmonic restraint tests on
transformer differential relays. When interconnected, there will not be more than a ± 3º
phase shift between the two main current outputs (same output taps). An optional
interface cable is available to interface two SR-98 units together, see Optional
Accessories in Specifications.
Parallel Printer Port
(
3
):
The parallel printer port can be connected to any dot matrix,
Centronix compatible
printer. Used in conjunction with the
PRINT SCRN
button, it allows the user to print
metered values / Test Results from the test screen directly to a printer. See
Parallel
Printer Port
Section for more information about the port.
RECLOSING RELAY
Reset Fuses
1A
(
4
):
Protects the reclosing relay A/B contacts of the test set. If this fuse is tripped, the unit
A/B contacts will not operate. If Fuse trips, check test circuit for cause of inappropriate
current. Reset fuse by pressing down on fuse reset button.
RECLOSING RELAY A
and
B
Terminals (
5
):
These two sets of relay contacts, one Normally Closed (
A
) and one Normally Open (
B
),
work in conjunction with the
Reclosing Relay Test Screen
to simulate the opening and
closing of circuit breakers.