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You are quite right Waross, the Purchase includes all Transformers (used + spare) complete with HT/LT Switch-gear, Protection etc. Our existing system is 70KV from State Utility, 20KV / 11KV / 3.3KV and 380V. Gen-1 is 11MW / 3.3KV and Gen-2 is 38MW / 11KV. We intend to add a new Feeder from...

Our Paper plant uses 380 V for LV distribution. We have recently purchased a second hand Paper Mill from Australia where Power distribution was 11 KV, 3.3KV and 415 V. The total plant load was 15 MW. In all 30 Transformers 11KV/415V and 1000 motors will be installed in this Plant. Changing to...

A turbo generator rated for 60 hz is required to generate at 50 hz. Assuming all utility eqipment are changed to 50 hz, and monitoring, metering and protection settings are availible for 50 hz, will changing governer setting to slower rpm and adjusting excitation be able to deliver rated power...

Thanks friends. We used to sleeve rotors earlier but faced frequent problems. Then graduated to metal spray which was expensive but fewer problems but the cost vs performace debate goes on!!!!!

For repairing worn out shaft at bearing seat and worn out bearing housing on end shields of motors 30-300kW, use hot metal spray OR put a sleeve. How does cost compare to performance.

Thanks folks for sharing your ideas and experiences. EMD considerations can be taken care of during during design and installation. At my earlier assignment, not 1 EMD related failure in 10 years. Cable selection, laying and grounding is crucial. Why plant managers are worried about DC Motor...

A 250 TPD (400mpm) Kraft Paper Machine required drive upgrade because existing analog DC sectional drive (17 sections - 2500 KW) has no spares. Motors are OK. Loading is 50-70%. Options are DC to DC, DC to AC (common DC bus) DC to AC (common AC bus) Your votes please! Specific question 1. 5-7%...

I am looking for a Data Logger cum Recorder for our analogue DC drives with the dual purpose of fault locating by history recording (trigger based?) as well as tuning by high speed paper / paperless recording. I have used Yokogawa OR100 series Oscilloscope and DARWIN PC based loggers. What is...

I am looking for a Data Logger cum Recorder for our analogue DC drives with the dual purpose of fault locating by history recording (trigger based?) as well as tuning by high speed paper / paperless recording. I have used Yokogawa OR100 series Oscilloscope and DARWIN PC based loggers. What is...

An old Yankee tissue machine requires revamp from DC to AC drives. Due to lack of time and space it is proposed to use individual AC feeders and a common PLC, instead of a common DC bus. Total 15 motors 6x100kW, 9x34kW. What are advantage / disadvantage

3 Wire Paper machine, 500mpm(max) uses analogue sectional DC drives & PLC for draw control. It is required to do away with the PLC and speed regulator due to lack of spares. A new PLC will handle draw, HMI, AND speed regulation. Tacho is 300 ppr for 1500rpm motor. Is speed regulation of 0.3mpm...

We have many spare Rotors in good condition for our DC Motors but there is no tag or any information about them. Most rotors have been identified by dimensions. There is one rotor that fits in 100kW / 1750 & 1150 rpm motor as well as 75 kW / 1750 rpm motor. Is this rotor freely interchangeable...

Thank you friend. Best regards astroid

Dear Skogsgrra, thanks a lot. I am situated in a remote factory in Java, Indonesia. We have TOYO DENKI drives and motors from Japan. They use series winding in ALL drives of the wet section. One last point. If a motor fitted with series winding is required to be connected without using the...

Thankyou Skogsgurra, Does this summerise the issue 1.In sections like Wire, Couch, and Press that are mechanically coupled, but each motor is fed from individual Drive panels, the master drive speed is controlled by Tacho and the slave drives share the load by controlling the current ref limit...

A separately excited 185 kW DC motor has an optional series winding. Manufacturer says it is to be used to enhance speed regulation in a Master application and speed drooping in a slave, but only when both motors are fed from one converter, otherwise there is no distinction. In single drive...

Thanks friends. What should be the voltage & frequency of the AC supply connected to the field to get best results. Thanks

What is the best way to locate the neutral axis of a DC motor in the workshop where motor is usually tested on no load. regards

Thank you for the inputs. We are looking at all aspects.

DC Motor running a paper machine line shaft is 185Kw,400V,490A,1150rpm. Normal running data is 380VDC,320A,1000rpm. It was replaced by 167KW,400V,449A,1750rpm. Amps reached to 450 at only 500rpm. Motor drive pulley dia was reduced and rpm could be raised to 800 at full load. A day later someone...