Auto Sync vs Sync Check relay
Auto Sync vs Sync Check relay
(OP)
Can someone please explain to me the difference between an Auto Sync relay and a Sync check relay in regards to a generator application? In looking at an SEL 700G relay it appears that the relay can provide both functions but I don't quote understand the difference between the two functions.
Does the auto synchronizer sense when the generator is in sync with the system that it is trying to sync with and control/close the respective breaker when synchronization is detected, while the Sync Check relay checks for synchronization between the generator and the source at all times and trips the respective breaker when this loss of synchronization is detected?
From what I've seen its a good idea to have these two functions located in separate relays in order to eliminate a single point of failure taking out both of these functions.
Does the Auto Synchronizer also control the speed of the generator or is the generator speed strictly controlled by the generator controller or governor control?
Does the auto synchronizer sense when the generator is in sync with the system that it is trying to sync with and control/close the respective breaker when synchronization is detected, while the Sync Check relay checks for synchronization between the generator and the source at all times and trips the respective breaker when this loss of synchronization is detected?
From what I've seen its a good idea to have these two functions located in separate relays in order to eliminate a single point of failure taking out both of these functions.
Does the Auto Synchronizer also control the speed of the generator or is the generator speed strictly controlled by the generator controller or governor control?






RE: Auto Sync vs Sync Check relay
RE: Auto Sync vs Sync Check relay
Straight-up synchro-check relays don't have all that.
CR
"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]
RE: Auto Sync vs Sync Check relay
Benefit is that the control signals are kept within the control panel, and the check synchronizer operates both as a check on the auto synchronizer and on inadvertent wiring changes bypassing the auto synchronizer. Very expensive when it happens.
In my humble view, an auto synchronizer is not a relay, it is a control device.
RE: Auto Sync vs Sync Check relay
CR
"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]
RE: Auto Sync vs Sync Check relay