VOLTECH AT3600 USER MANUAL PROGRAMMING TESTS
TEST PROGRAM EDITOR VPN 98 - 024 PAGE 3.4.59.
4.36. LVOC – LOW VOLTAGE OPEN CIRCUIT
Applying an ac voltage to the primary of the transformer will produce an ac voltage
in the secondary. Low Voltage Open Circuit measures the ‘open circuit’ voltage
produced when the specified test signal is applied.
The secondary voltage may be in phase with the primary voltage or it may be anti-
phase depending on the winding and the termination of the windings.
To program the test:
1. Enter the required test signal.
2. Choose the integration period (normally ‘medium’).
3. Enter the terminals to be used.
4. Energized terminals: The terminals where the test signal will be applied.
This is normally the winding with the greatest number of turns.
5. Primary terminals ‘High’ and ‘Low’: The zero phase reference terminals
which are often the same as the energized terminals.
6. Secondary terminals ‘High’ and ‘Low’: The turns ratio and polarity
measurement will be made between the primary and secondary terminals.
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