Hi All,
Our client would like to control power flow on a single line of a three line export facility. This facility will export into the larger national grid.
My question is: Should we utilize a phase shift transformer to manipulate the Vs compared to Vr phase angles with intent to control...
My past two companies I have worked for A holes. I refused to believe that this is how work is and i must accept people like this. So I resigned and moved on. I have learnt a great deal in my short career, 7 years, but one thing for sure i can tell you. DO NOT SETTLE for less than what you want...
thanks iop95.
very interesting in deed. We do not plan to have one "rheostat" (liquid resistor starter in my case) but 2. One for each motor, the starting will be interlocked on the MV contactors.
In the event there is an issue with one of the motors, the client would like to run the knives...
thanks for the responses. As LionelHutz says, we cannot change the slip ring motors, as the client has already ordered them, we are sourcing liquid resistor starters, and the resistor banks that do not switch out after start will have 3 tapping points, +3%,+5% and + 7.5% slip. I do not have...
thanks for the response
The slip ring variable resisitor starter is for torque/current control during startup , once motor is up to speed the variable resistor drops out but maintains a slip resistor that is continously connected to the rotor.
this method of startup does not offer speed...
Hi Guys,
A sugar mill is planning a front end upgrade. We are taking over the project on there behlaf as they cannot deliver on a tight timeline.
My question : what (if any) implications are there in running the two MV motors on a common shaft. The idea is to directly couple the motors using...
Hi Guys,
I would like to thank you for the responses. RCWILSON and HOXTON , the TA runs in a island mode supplying the plant.
The TA generates at 11kV. and the plant has a 11kV cap bank rated at 3MVAR's. The mill complains if they swicth the cap bank on its starts to trip loads on on the LV...
Thanks for the reply.
Am i rite in stating, a Generator (turbine alternator in my case) supplies reactive power (VAR's) and real power (MW) into the system. A motor is an inductive load that is why we compensate by using capacitors which is a reactive load and brings the apparant power closer...
Hi Guys,
A certain sugar factory has a 10MW @0.8PF condensing turbine alternator installed. upon a recent site visit i have concluded the TA is running at an average of 0.62 PF and no one seems to have an issue with this.
Using simple calculations i have determined that if i improve the PF...
i need to investigate the disadvantages of having multiple earth referance points on a single bus system. The system comprises of 2 x 6MW TA's identicle and 3 x 1.5MW DG's identicle, either the TA'a will run or the DG's. they all have high resistance NER's connected. with this system in place...
