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> Ge ijs synchronism-check relay 52A7A nos mint 115V 7A
Ge ijs synchronism-check relay 52A7A nos mint 115V 7A
GE IJS SYNCHRONISM-CHECK RELAY 52A7A NOS MINT 115V 7A
The IJS is an induction disk synchronism check relay that has two shaded pole U-magnet driving elements acting on opposite sides of a single rotating disk. One operating element drives the disk in the contact closing direction and the other in the restraining or opposite direction. The disk shaft is restrained by a spiral spring, to hold the contacts open when the relay is de-energized. The motion of the disk is retarded by permanent magnets to give a time delay.
Generally, the IJS relay is applicable as a synchronism-check relay to permit closure of a circuit breaker only when two sources connected to it are synchronized elsewhere. It determines that synchronism is being maintained by other interconnections, and then permits closure of the circuit breaker. In such an application, the voltages on either side of an open line breaker may be slightly out of phase with each other because of load flow on the rest of the system. The relay, however, can be calibrated to permit closure of the breaker under these conditions if the voltage and the phase-angle differences are not excessive.
The relay has an adjustable time delay and permits operation only if the phase angle remains less than a definite number of degrees for a selected time. The relay operating torque increases as the phase angle decreases and is a maximum when the two compared voltages are in phase.
On systems where the two sides of a given breaker may or may not be interconnected elsewhere at any given moment when paralleling is desired, the IJS is used at the same location for synchronism check when the frequency difference is negligible or zero due to the existence of an interconnection elsewhere.
Forms of the relay are available with a rated calibration range up to 60 degrees. For settings over 20 degrees, consideration should be given to the resulting generator stresses at the instant of closure through existing system impedances, as in any other situation involving out-of-phase closure.
View the GE Industrial PDF Info file here. This can currently be purchased directly from GE for over $2000 US.
Here are some of the hot-points of this synchronism-check relay:
* GE Synchronism-Check Relay Model I2 ISJ 52A7A
* 20/60 degree closing angle
Model: General Electric IJS 52A7A Synchronism-Check Relay
Features: Closing angle 20/60 degrees; 115 volts; 60 cycles
Size: 7" x 9" x 8" (L x H x D); Case: S1
All Michigan residents will be charged 6% sales tax during the Checkout process.
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