SA19 and SA12 synchroscopes
Country: · Model: SA19, SA12
The SA19 and SA12 synchroscopes show the phase difference between the busbar voltage, which serves as the reference, and the generator voltage on an illuminated scale. They are used when two alternators are paralleled.
Technical specifications
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
Two generators can run in parallel only if their voltage magnitude, frequency and phase coincide. The synchroscope shows the last two parameters visually, while voltage is compared with voltmeters. A spot of light travels around a circle, and its position corresponds to the real phase difference between the busbars and the incoming generator. The frequency difference follows from how fast the spot turns, since it is the inverse of the time of one rotation. Marks on the front show the direction of the deviation, meaning whether the generator is slower or faster than the busbars, and a synchronism mark lights up at the middle of the scale. The BUS and GEN lamps remind which source is the reference and which one is incoming.
How to choose
The choice between the SA19 and SA12 comes down to external dimensions and panel cut-out, both taken from the datasheet of the version. Both models do the same job, so the criterion is fit in the existing generator panel. The voltage ranges of busbars and generator are also checked beforehand.
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SA19 and SA12 synchroscopes. We reply within one business day.
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FAQ
What does the SA19 synchroscope show?
The phase difference between the busbar voltage, the reference, and the generator voltage, with the frequency difference visible from the speed of the light spot.
How does the SA12 differ from the SA19?
Both synchroscopes do the same job. Dimensions and fit are confirmed on the datasheet, so the model is picked to match the existing panel cut-out.
What must match when generators are paralleled?
Voltage magnitude, frequency and phase. The synchroscope shows phase and frequency.
How is the frequency difference read from the synchroscope?
From the speed of the rotating light spot, because the frequency difference is the inverse of the time of one rotation.
What are the BUS and GEN lamps on the synchroscope for?
They show which source is the reference (busbars) and which is incoming (generator), so the connection is not mixed up.
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