Hi,
We have a turbine driven generator set and the cooling water for the oil cooler comes from a cooling tower station. However, it could happen that due to clogging of the oil cooler, the cooling pond water pressure might rise to such a point that the cooling water pressure is greater than the...
Hi,
A casual worker was superficially burned on the fingers when a power cable was accidently put into contact with the frame. The worker was touching the frame at this particularly instant. The 63 Amps MCB did trip but was not fast enough to prevent the accident.
According to the IEC rules...
Hello,
We suspect interfault in the rotor of one 150 k VA generator set. It`s a brushless machine.The exciter is rated 82 V 6 Amp.
The insulation resistance is fine and we wish to know basically how to test the rotor for interfault fault.
We do not have in hand dedicated tool for this purpose...
Hi,
We had side wall damage on our Water Tubes boiler 90 T/Hr 35 Bar 475 Deg C at re-start after a stoppage of 30 mins. We presumed the damage was caused by sudden explosion due to accumulation of gas inside the furnace when fire was resumed on the boiler.
We are proposing to implement...
Hi,
Further to my threads on the high CO content and capacity of the ID fan , and following the difficulty of the ID to induce a negative pressure on my boiler at full load, we are now having side wall damage. I presume the damage is caused by the constant puffing inside the combustion chamber...
Hi
We have one SLC500 plc controlling the essential functions of a turbine driven generator. The PLC communicates with our Woodward 505 governor through modbus protocol via a prosoft communication card. We had since the last three months two communication failure with the woodward governor and...
Hi,
I just joined a company and could not logged on their network. I could not see any PC in the neighbourhood network. My PC was configured for TCP/IP connection and their PCS as well.All the PCS are connected to the main server , located kilometres away, through a router. I was able to work...
Hi,
I have seen many posts using the term VSD rather than VFD.A variable frequency drive varies the frequency which is a vector quantity rather than speed which has got magnitude only and no direction.
Bob
Hi,
We have actually installed one 900 k W motor driving two rollers through one main gearbox. We are having gear damage on one of the roller , because at a particular instant it is possible that the maximum available torque at the output shaft of the gearbox could be applied to one of the...
Hi,
We need to install one 1500 amps @ 400 V variable speed drive for a variable torque application.
We have two options in hand-one with two 700 amps VSD in a parallel combination that is two single VSD units in parallel sharing a common DC bus.
The other option is a standard one with a main...
Hi,
We are burning transmission belts on a conveyor like a hell. The conveyor is driven by a sensorless vector drive and the starting inertia is quite high. Previousy the drive was tripping on overload during start-up , so I have configured the drive for full torque at almost zero speed. The...
How could the capacity of the ID fan be determined for a bagasse fired boiler ?
I noticed on my boiler that at a certain flow rate, it is really very difficult to manitain a negative pressure in the furnace and the ID is almost at 100 %.
Bob
We got a breakdown on one of our 400 V variable speed drive yesterday morning. The drive tripped on starting and the following faults were recorded namely overcurrent,angu , ground fault, overvoltage and undervoltage . The motor was disconnected to the load and the motor started .It again...
We are operating with a T-N system and the negative of our 24 V supply is not grounded. I intend to earth the negative and bring it to ground potential.
Are there any constraint in doing that /
Bob
For some make of vibration transducers, the cable screen is connected to the instrument earth (0V) at the monitor end and not connected to anything at the transducer end to avoid earth loops if the machine earth is at a different potential, that is the positive and negative wires are insulated...
Hi,
We are having a high temperature >300 deg C on the axial bearing of our 15 MW steam turbine . However, the high temperature is only noted when the m/c is stopped. It is worth mentioning that the machine is stopped every each month for maintenance purpose.The high temeprature is recorded...
Hi,
Th power measured by a Fluke power meter on the input side of my VSD 400 k W capacity is around 300 k W. However, the VSD is only reading below 200 k W on both the VSD display and the 4-20 m A analogue output of the VSD.
I understand that the a 2 % loss is reasonable but 100 k W seems to be...
