First Trip/Close Tests
2-20 72A-1898 Rev. A 11/01
Monday, November 26, 2001 1:09 pm
The minimum set of channels is:
• One Main Contact current (analog measurement from
CT secondary)
• Trip (or Close, if performing the First Close test) coil current
(analog measurement)
• DC supply voltage (analog measurement)
• 52CS/T (or 52CS/C if performing the first Close test) contact state
for Trigger In (Aux Contact measurement)
The recommended set of channels is:
• Three Main Contact currents (analog measurements from
CT secondaries)
• Trip (or Close if performing a First Close) coil current
(analog measurement)
• DC supply voltage (analog measurement)
• 52 X or Y coil current (analog measurement)
• 52 X relay contact state (Aux Contact measurement)
• 52 Y relay contact state (Aux Contact measurement)
• 52A relay contact state (Aux Contact measurement)
• 52B relay contact state (Aux Contact measurement)
• 52CS/T (or 52CS/C if performing the first Close) contact state for
Trigger In (Aux Contact measurement)
Test System
Component
Requirements
The following components are required to perform a First Trip/Close test
using an external trigger for the minimum set of channels:
• An Event module (T9433)
• System module with Trigger In/Out (T9003, T9004, T9005)
• Two Doble current probes (P/N 401-055)
The following components are required for the recommended set of
channels:
• Two Event modules (T9433)
• System module with Trigger In/Out (T9003, T9004, T9005)
• Five Doble current probes (P/N 401-0055)
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