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The user simply selects from a menu screen for different testing applications. For
example see the TEST MENU below.
As can be seen, the SR-98 can test a wide selection of relay types. The phase shift
capability means that the unit can continuously adjust the phase angle relationship
between the voltage and current outputs. Therefore, values like reach, maximum angle
of torque, directional balance points and closing angles can be easily tested. In
addition, breaker contact simulation provides swift and easy testing of reclosing type
relays.
Other types of relays not specifically listed on the menu above can be tested using one
of the menu selections. For example, current differential, voltage controlled/restrained
overcurrent and current balance relays are tested using the CURRENT RELAY test
screen. All single-phase impedance type relays, and some three-phase relays that can
be tested single-phase with the voltage coils in parallel and currents in series, are tested
using the IMPEDANCE RELAY Test Screen. This would include transmission line
protection and loss of field type relays. The SYNCH RELAY Test Screen is used to test
synchronizing, sync check and phase sequence relays.
The Metering Screen provides powerful multi-purpose metering functions. Values like
Volts, Amperes, Phase Angle, Power, Reactive Power and Power Factor are all
simultaneously displayed.
Input
Power:
Model
Numbers
SR98-1/60
and
SR98-2/50
:
90 to 253 Volts AC, 1
φ
, 50/60 Hz, 1700 VA Max.
Model
Number
SR98-3/50
:
230 Volts AC,
±
10 %, 1
φ
, 50/60 Hz, 1700 VA Max.
Outputs
Three independently controlled adjustable outputs are available from the test
set... one AC current, one AC voltage and one DC voltage/current. The voltage
outputs are independent from the main current output.
Summary of Contents for SR-98
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