Dear all
My office consists of 4 floors. Originally from the contractor, we use Central Air Conditioner System to cool the rooms and the corridor. But, instead of using Central Air Conditioner, we also install split AC in most of the rooms in our office (80 % of Total Rooms approximately). We...
Dear All,
I work At Steam Power Plant 2 x 100 MW. It has Two Generator Step Up Transformer , Two Auxiliary Transformer and One Starting Transformer. The Starting Transformer is used mainly to supply auxiliary power to Main Unit during Shutdown, desalination plant, chlorination plant, Water...
Dear all,
I have a little question.
Could you explain, which is more dangerous to our electrical equipment (electric motors, TV, refrigerator, etc), Voltage Dip or Frequency Dip?
Thanks for your attention..
Dear All
I work at steam power plant. Last year, insurance came to our site and gave recommendation that we should install fire protection (sprinkler) for steam turbine generator bearings. then we asked our vendor (MHI). MHI said that the bearing that is used in our power plant is directed...
Dear All
I work at steam power plant. Last year, insurance came to our site and gave recommendation that we should install fire protection (sprinkler) for steam turbine generator bearings. then we asked our vendor (MHI). MHI said that the bearing that is used in our power plant is directed...
Dear all,
Last week Our Boiler Feed Pump Motor was tripped few seconds after started. From The Event Recorder in The Relay Panel, it was found that the cause was Short Circuit Trip.The current at that time were 1506 A (Phase A),1125 (Phase B), and 1115 (Phase C) . It exceeded the Short Circuit...
Dear all,
We operate 2 x 100 MW Steam Power Plant. we have serious problem with our air preheater. Last recent months, The pinion gear of air preheater was often damaged. When it was damaged, we replace with new pinion gear. But, after few weeks, it was damaged again. For your information, the...
Dear all,
We operate four generators in our steam power plant. 2 X 100 MW and 2 X 200 MW. They are Toshiba Generator. Built in 1980 and 1987. Our Grid Frequency is 50 Hz. According to Our National Grid Code, our generator must continuous supply the grid in the frequency range of 47,5 - 52 Hz...
Dear all,
Our Power Plant (Combined Cycle Power Plant) was built in 1990's. The material composition of the generator retaining ring is 18 % Mn 5 % Cr. We also have been informed, that several 18 % Mn 5 % Cr Retaining ring failure were cauded by stress corossion cracking. My question is, is it...
Dear All,
we have installed online partial discharge measurement in our generator (2x 100 MW). From the last 2 month measurement result, it was found that partial discharge measurement value in one of the phase ( V phase) exceed 18 nanocoulomb. But this value occurs rarely (sometimes), not...
I would like to ask question. In Steam power Plant, is it effective to operate Steam Coil Air Preheater when we used natural gas as the fuel?..which do you think is better, Operating or not operating steam coil air preheater when we use natural gas as the fuel?
Thanks for your attention
I work 2x100 MW Steam Power Plant. We have two units of Desalination plant, Unit 5 and Unit 6. The type of the these desalination plant is Once Through Multi Stage Flash (MSF) Desalination Plant. The maximum production rate is 1000 ton/day/unit. Last few days, we have a unique problem in our...
Dear friends, I've some questions here.
1. If we live under/near 150 kV transmission line, will it give us negative effect for our health?
2. How much the safe value of Electric Fields and Magnetic Fields so that they would not give us negative effect
3. How far is the safe distance (minimum...
I work at Steam Power Plant 2 x 100 MW. We inject Ferrous Sulphate to the COndenser in order to prevent Condenser from Corrosion. We also inject Chlorine (Sodium HypoChlorite) before the travelling screen to prevent Marine organism from growing up in the Condenser. My Question is Could we inject...
I've read from ANSI DEVICE NUMBER that 79 relay is an AC Reclosing Relay. at this,I would ask some questions.
1. could you describe about the construction of 79 relay?
2. how does this relay work?
3. do you think this relay effective to prevent the motor from trip due to voltage dip due to...
One of Our Steam Power Plant Unit was in trouble. Originally the main steam temperature was set 540 C and the main steam press was set 170 kg/cm2. But, there was a problem. We reduced the steam temp setting to 515 C. After we reduced the setting of main Steam Temp, the turbine bearing vibration...
Last January, there was a serious problem in our generator transformer. Relay 87 T and Pressure Relief Devices operated. After investigation, we had found that the problem was in the Off Load Tap Changer. There was a flashover on the TC. We found some carbon material on the TC phase W tap...
In Power plant that I works, Last 6 months, there was a failure in the Fuel Control Valve. Suddenly Main Steam Pressure Increase and Drum Level Become Very Low. The Drum Level decreased so quickly that Unit Trip (MFT) before the Safety Valve works to release the increasing pressure of steam. Our...
I work at a Steam Oil Power Plant (2x100MW). In my power plant, the electric generator use H2 as cooling medium. Sometimes, H2 pressure decreases from 2 bar to 1,9 bar. I would like to ask about this. Is this pressure drop has an effect to the decrease of the overall plant efficiency (Heat...
