We have a few brush type synchronous motor of different HP used in our application.
I'm thinking of bringing the motor to close to synchonous speed and then apply the DC field.
Some manuals (GE-SPM) say after it reaches between 1- 10% slip (settings) and it should be closed on positive zero...
Friends,
Greetings!
I'm trying to determine the running state logic of Synchronous Motor. I don't have field contactor breaker status and speed signal.
The signals I have are stator current, 52A stator breaker status, rotor field current, rotor field voltage.
This machine is started as...
Would a simple Rate of Change of frequency Relay enough for detecting islanding condition for wind turbine application which uses Induction generators. Can we detect power mismatch in this application?
We have only one extra voltage input in the Relay other than the 3ph voltage input . Has anybody heard of any application where you can switch between two PT inputs ? one from VS PT( synchronism voltage) for doing 25 function and other from 3V0 PT (broken delta) for directional protection.
We...
How to design SPR blocking scheme using 63 and 50 Fast instantaneous over current element?
Is SPR used for tripping the relay for internal faults only?
How will it block tripping if 63 contacts are short because of transient?
The logic I'm having in my mind is= 63A And not 63B not 87 not 50)...
1. Which Relay is the best for detecting fault in high impedance grounded/ungrounded multiple synchronous generators in parallel?
What I think is voltage based ground fault detection is not very sensitive/selective for this type of ground. 59G, 64G (VN, VN3) are all good as backup protection...
Do customers generally what to see phase- phase voltages (VAB,VBC,VCA) or Phase -Neutral voltages (VAN,VBN,VCN) in the Feeder Protection Relay Metering despite of delta or wye connected PT inputs ?
We tried Autosync of an old diesel start gas plant with settings like 0.5 Hz/s characteristics, 0.25s pulse, 10s pulse interval for frequency control and it worked ok.
How different is a hydro plant in terms of settings? Could I use the same settings? We couldn't obtain the characteristics from...
The relay has following funtions: distance, v/hz, synch check, auto synchronism, undervotlage, reverse/forward power, loss of field, negative sequence, overcurrent, time over current, over voltage, stator ground fault, out of step, frequency relay, current/ground differntial.
Should we write in...
Please help me with your experience of which is the safest schemes for safe bus transfer among for critical load power plant:
residual voltage transfer, slow transfer, in- phase transfer, parallel transfer , fast transfer, etc...
Also tell me the didadvantage of fast transfer, our relay has...
1. In the the design of the relay for autosync of generators, what are the different ways to start the autosynchronizer like autostart command?
2. At what frequency and voltage of generator do we switch to autosynchroniser , is it like around 80% speed and 50% voltage?
3. Do we generally raise...
