AC-PRO
®
& AC-PRO-II
®
B-292 Secondary Injection Test Set Instruction Manual Rev 1.1
www.utilityrelay.com
Page 6
3.0
Test Set Controls
A brief description of the operation of the
various test set controls is given below.
The numbers in parentheses refer to the labels
in Figure 4.
3.1
Power
Power to the test set is controlled with the
Power On-Off switch.
An AC cord is supplied with the test set. The
recommended AC power source is 120V AC at
either 50 or 60 Hz. The 120 VAC receptacle
also contains the 5 Amp, 250V, 5 x 20mm main
power fuse.
3.2
Time Display
The test set will measure the time elapsed while
current is being delivered to the trip unit, and
display the time on the Timer display.
The displayed time is in seconds with 1/100 of
a second resolution.
The time will stop accumulating when a
trip occurs or when the Stop (7) push button
is pushed.
The timer display is cleared when the Clear (8)
push button is pushed.
3.3
Timer Clear Push Button
The Clear (8) push button clears the
Timer display.
3.4
Start Push Button and LED
The Start push button starts the test current
flow to the trip unit and simultaneously starts
the Timer (6).
The green LED located above the Start push
button indicates test current flow.
3.5
Stop Push Button
The Stop push button stops the test current flow
and simultaneously freezes the Timer (6).
3.6
Test Current display
The Test Current display indicates the true
RMS test current in amps, going to the
AC-PRO or AC-PRO-II during a test.
To determine the equivalent CT
primary current:
1-Amp AC-PRO or AC-PRO-II
…multiply
the test set current by the CT Primary rating
set in the trip unit.
For example:
If the CT primary rating is 600 and the test
current is 1.50 amps, then the equivalent
primary current is:
1.50 x 600 = 900 amps primary
0.5 Amp Example
…multiply the test set
current by the CT Ratio (CT Primary
Rating ÷ CT Secondary Rating).
For example:
If the CT Primary Rating is 600, the CT
Secondary Rating is 0.5A, and the test
current is 0.75 amps, then the equivalent
primary current is:
0.75 x (600
÷
0.5) = 900 amps
Note: If CT Secondary Rating is different than 1.0 or
0.5, use the 0.5 example above and replace 0.5 with
the specific CT secondary rating.
3
6
8
5
4
7
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