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Hey Guys, I am taking a deep dive into directional earth fault protection. I would like to know;if the relay is using Uo on the horizontal plane for polarizing the relay, does this means the internal calculation to determine the trip angle is a power calculation either reactive or active.

Hello guys, In most power plant I worked, we use a feature called megawatt override this is programmed in the Woodward 723 plus. This featured is use when operating the plant in base load and if the frequency drop to 59.5 or rise to 60.5 the Woodward control will trip to droop to assist in...

Hi guys, working with diesel engine of 320 mm and 460 mm, I observed that after doing maintenance on the turbo(replace cartridge and new nozzle ring and cleaning) the outlet temperature(stack) of turbo is very high.The problem goes away after a week of running the engine at maybe 60 to 100...

Hi Guys, Today I encountered a problem with our compress air system. We have 4 30bar 20m3/h sperre piston type motor drive compressor. The problem was with all four air compressor running for for 8 hours only 27 bars of air was maintained.My thought was the compressor are not working...

thread71-351425 Good morning A few months back, I posted a question about the F-timing vs miller timing for diesel engine. I final got the answer. Miller timing- Is when the intake valve close a few degree before bottom dead centre,on the intake stroke. F-timing - is the same principle as...

hello everyone, The problem I am having is that I replaced a Stanford MX341 AVR with a MX321 AVR. The 341 is a good working avr, but the genset is going to be synchronize with two other gensets with 321.This is why we replace the 341 with the 321.The problem I am having with the new avr is...

Hello, In my opinion in plant operation and maintenance there are three set of engineering/technical personnel. 1.The engineering manager who never spent a day in the field/plant. 2.The engineering guys/engineer who engineer, plan,design,implement and commission the plant (electrical...

Hi guys, Can anyone explain or guide me to appropriate literature, why a diesel engine exhaust temperature is high with a rich air to fuel ratio and a gas engine exhaust temperature is low?

Hi, I would like to share an experience with you guys. The other day at work,one of the operator told me that the air compressor is operating in emergency mode, where all protect is by pass.So I when to trouble shoot the problem,find out that the Siemens logo was not in run nor stop mode...

Hi guys, The power pant that I work at have two outgoing feeder,which feeds two power transformer 11 KV to 69 KV. The 11 KV breaker that feeding these transformer are interlock, so at no time both of they cannot be in service at the same time.which I understand because of recirculating current...

Hi guys, At a 50 MW power plant that is parallel with the grid i observed that the power factor of the out going feeder is different from the station transformer, the outgoing feeder is pf0.85 and the station trafo is pf0.95. Since we are running in pf mode,by changing the pf the voltage change...

Hi guys, Can any one explain the different between miller timing and f-timing.

Hi guys, Recently i clamp the ground of our station transformer (11KV-400V,60HZ,2.5MW,type-onan) and see 7.8 amp flowing to ground.I would like to know the acceptable value and if someone can guide me to the regulation for this type of transformer and voltage range.I try look but mostly low...

Hi guys i need your help with an issue,i told an engineer that putting a PLC in stop mode completely stop the program from running and when place back in run mode the PLC run the program from a complete start,he said if i take the circuit breaker off to the power supply of the PLC it would do...

Hi, i have being working with diesel generator for over ten year and only yesterday on a truck i came across a throttle body on a diesel engine and found it strange cause i never seen this before, so can you guys please explain its purpose.

Hi guys, i would like your opinion on this problem,we use radiator to cool the water on our 17 MW diesel generator and i am trying to find out is there a specific running hours for the motor bearing to be changed,the product manual say to grease at 15,000 to 30,000 hours and the generator is...

Guys, I have a question if we connect 3 single 100 KVA transformer in a three phase configuration what will be the total power that can be use from the transformer 3*100KVA =300KVA or 1.73*100KVA=173KVA.

Hi Guys, I would like to know in EL CID testing of synchronous generator do you have to remove the rotor to perform this test. Julian. "its not what u know its what u can apply".

Hi guys, I have four fuel storage tank feeding two different power plants ,each tanks have two p/i tranducer for each plant level reading on the hmi ,my problem is that most sensor on the tanks not work and need replacing,but i was thinking of only buying four p-i tranducer and use 4-20ma...

Hi guys, in power plant where the have the frequency clock it displays the frequency, standard time ,time difference and frequency time ,i know the frequency and standard time but what is the frequency time.