AC-PRO
®
& AC-PRO-II
®
B-292 Secondary Injection Test Set Instruction Manual Rev 1.1
www.utilityrelay.com
Page 1
1.0
Introduction
The Model B-292 Secondary Injection Test Set
is a single-phase test set specifically designed
for testing the operation of the AC-PRO and
AC-PRO-II microcontroller based trip units
manufactured by Utility Relay Company.
The earlier version test set with the “Red”
panel, can only be used to test the AC-PRO. It
cannot be used to test the AC-PRO-II.
The test set can test pick-up and time delays of
the various protection functions by driving
current into the trip unit on the secondary side
of the CT circuit.
The test set will test 60, 50, 40 or 25 Hertz
AC-PRO trip units. (The AC-PRO-II can be
set for either 50 Hertz or 60 Hertz).
The test set will test the AC-PRO or
AC-PRO-II trip system with the exception of
the CTs and associated wiring harness.
Important:
Secondary injection testing is not a
substitute for primary injection testing
that should be performed for any circuit
breaker retrofit.
2.0
Overview
The basic function of the test set is to deliver an
accurate level of AC current directly to the trip
unit under test and to verify the pick-up values
and times required for the AC-PRO or
AC-PRO-II to trip.
The technician running the test will operate the
Start (5), Stop (7), Clear (8) and Current Preset
(13) push buttons, adjust the Amp Coarse (14)
and Amp Fine (15) potentiometers (pots), and
adjust the Phase (11) and Frequency (16)
Selector switches. The two displays (6 & 12)
are used to indicate elapsed time in seconds and
test current in amps.
Note: Numbers in parentheses refer to the
labeled items in Figure 4.
Please reference the AC-PRO and
AC-PRO-II users manuals for complete
trip unit instructions.
