Synchrocheck relay protection
Synchrocheck relay protection
(OP)
I am using a Crompton Synchrocheck relay 244-14hg to synchronise 2-3 generators in my factory. The relay blew some time ago and was replaced, it has blown again. I believe transients may be causing the relay to be damaged. Does anybody know of suitable voltage suppression units or any other ideas for additional protection?






RE: Synchrocheck relay protection
Given grounded-secondary PTs, if the generators are of any significant value, it may be funds well spent investing in a simpler, more rugged induction-disc relay, like an IJS-type device.
Aftermarket transient protection for somewhat essential supervisory devices seems to have a very limited success record; id est, why has that not been built into the device at the design stage?
RE: Synchrocheck relay protection
The main question here may be whether or not the device is qualified for use in substation environments (to ANSI C37.90). If not, then I suggest checking with Basler, Beckwith, ABB for appropriate synchrocheck relays.
RE: Synchrocheck relay protection
1) SCM21 of Micro Italia
2) MAVS 01,02,03 Alstom Make
3) 7VK512 Siemens Make
Try you will find better solutions.
RE: Synchrocheck relay protection
RE: Synchrocheck relay protection
Relays are on our internal 11kV and 3.3kV networks fed from our own output and NGC transmission system. VT's have normal grounding arrangement.
As you running up to three generators on site, how stable is your site voltage? Could it be that the relays are gently cooking themselves over a period of time?
RE: Synchrocheck relay protection
either relay may remaining in serivce continously that may leading to damage to the relay.
kindly confirm
RE: Synchrocheck relay protection
sivaramen, as to the differences between utility and industrial grade, an example of a utility-grade device 25 would Basler BE1-25 http://www.basler.com/downloads/ubp5bull.pdf where “industrial” would be BE3-25 http://www.basler.com/downloads/ula1bull.pdf
There are major differences between the two for support documentation, reliability, stability and serviceability. The “industrial-grade” assembly is typically discarded if problems develop. In most cases, US electric utilities will not permit use of non-utility {industrial} grade components in interconnection gear.
RE: Synchrocheck relay protection
Please check the wiring and/or if this equipment utility graded as was recommended.
Please advice when you find the problem since I may find it in the future.
I ask for the advice since I hadn't come to this forum lately due to lack of response from the people who ask originally, even when asked.
RE: Synchrocheck relay protection
http://www.platts.com/engineering/issues/Power/0107/0107pwr_srhydro.shtml
for a distinction between industrial grade and utility grade. The former tends to be less reliable and often breaks.
RE: Synchrocheck relay protection
http://www.pge.com/002_biz_svc/gen/pdf/wi_handbook/g2.pdf
for G2.3 Relay Grades