30-12-2011, 11:15 AM
I use a 1.5V alkaline cell and an AVO meter to check secondary phase.
Connect meter on 1A range to one of the secondaries.
Connect battery to primary (making a note of the polarity) watch the meter. The needle will kick one way as the current starts to flow and the core saturates and the opposite way when you disconnect the battery and the field in the core collapses. Reverse the meter leads and test again. Mark the secondary lead that gives a +ve kick when the battery is first connected.
Connect the meter to the next secondary. Again connect battery to the primary ensuring the same polarity as before. Watch the AVO needle again. Reverse the meter leads and test again. Mark the secondary lead that gives a +ve kick when the battery is first connected.
You've now identified the relative phases of the secondaries. For parallel operation, connect the two marked leads together, for series operation connect the marked lead of one secondary to the unmarked lead of the other.
Connect meter on 1A range to one of the secondaries.
Connect battery to primary (making a note of the polarity) watch the meter. The needle will kick one way as the current starts to flow and the core saturates and the opposite way when you disconnect the battery and the field in the core collapses. Reverse the meter leads and test again. Mark the secondary lead that gives a +ve kick when the battery is first connected.
Connect the meter to the next secondary. Again connect battery to the primary ensuring the same polarity as before. Watch the AVO needle again. Reverse the meter leads and test again. Mark the secondary lead that gives a +ve kick when the battery is first connected.
You've now identified the relative phases of the secondaries. For parallel operation, connect the two marked leads together, for series operation connect the marked lead of one secondary to the unmarked lead of the other.
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Ian
100,000 lemmings can't be wrong!
Ian
100,000 lemmings can't be wrong!
