Quantcast Synchroscope

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OTHER ELECTRICAL MEASURING DEVICES Test Instruments & Measuring Devices Synchroscope Figure 16    Ground Detector Lamp Circuit A  synchroscope  indicates  when  two  AC  generators  are  in  the  correct  phase  relation  for connecting in parallel and shows whether the incoming generator is running faster or slower than the on-line generator.  The synchroscope consists of a two-phase stator.  The two stator windings are at right angles to one another, and by means of a phase-splitting network, the current in one phase leads the current of the other phase by 90°, thereby generating a rotating magnetic field. The stator windings are connected to the incoming generator, and a polarizing coil is connected to the running generator. The rotating element is unrestrained and is free to rotate through 360°.   It consists of two iron vanes  mounted  in  opposite  directions  on  a  shaft,  one  at  the  top  and  one  at  the  bottom,  and magnetized by the polarizing coil. If the frequencies of the incoming and running generators are different,  the synchroscope will rotate at a speed corresponding to the difference.   It is designed so that if incoming frequency is higher than running frequency, it will rotate in the clockwise direction; if incoming frequency is  less  than  running  frequency,  it  will  rotate  in  the  counterclockwise  direction.    When  the synchroscope indicates 0o phase difference, the pointer is at the "12 o’clock" position and the two AC generators are in phase. ES-14 Page 26 Rev. 0


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