Search results

syed_hassan08, Thanks for the feedback!

A.K, These two specific questions were asked at the top of the previous reply: > Have you measured the current drawn by 88HR during ratcheting? > Have you observed the rotor when the unit is trying to ratchet? What is happening--does the rotor turn at all? While many people (most...

Excellent suggestion about checking the relief valve by Bob Johnston. You need to used the Starting Means P&ID to check/eliminate each of the elements in the piping/tubing system. Have you measured the current drawn by 88HR during ratcheting? Have you observed the rotor when the unit is...

jeet, From other posts here, I don't think we have the entire saga, and it would seem that configurations and settings have been changed and then changed. You haven't told us what kinds of units you are working on; if there is any transformer impedance between the units or if they are...

Ervin N Galera, In thinking about this, has there been a drop in the cooling water temperature recently? And possibly a reduction in load since the problem started? Both could result in condensation of moisture that was previously "suspended" in vapor in the hydrogen because the gas...

behzad, Mark Vs have been in service for a long time, and as such, it's likely this problem hasn't been occurring since the Mark V was commissioned at your site. When troubleshooting problems like this, it's very important to stop and ask, "When did the problem start?" In other words, what...

souvik ghosh, I was very sincere in asking what you thought an automated load tap changer does. My understanding of a load tap changer is that it is a device that is capable of changing transformer turns ratios while current is flowing through the transformer winding(s) and through contacts...

syed_hassan08, I also wanted to mention that just a few days ago I learned of a GE Mark V HMI (running MS-Windows and CIMPLICITY) with a time synch card had developed problems with time synching over several months. Ultimately, it was determined that the multi-headed cable attached to the...

What is it that you think an automated load tap changer does, and how do you think using an automated load tap changer will enhance or improve the output of PV cells?

Ervin N Galera, When did this problem start? After a maintenance outage? After a purge/charge event? What kind/size of generator? Does it have stator cooling? Have you changed hydrogen suppliers? Do you produce your own hydrogen? Have you tested the condensate/moisture to see if it...

syed_hassan08, It's been a VERY long time since I've worked on an <I> Mark V operator interface, so I may be a little rusty on a couple of points. You didn't tell us if there is a master time source (GPS; IRIG satellite receiver; DCS; etc.; sending a signal to one or more <I>s through a...

jeet, Power factor (at the generator terminals!) can be leading (positive) or lagging (negative). Since the Maximum value of power factor is 1.0, leading or lagging VArs/power factor is always less than 1.0. It would be necessary to know if the power factor was leading or lagging 0.85-0.95...

It seems they use #2 distillate/fuel oil (diesel). A small amount of carbonization is unavoidable. The problem is the original poster hasn't said how much (volume per nozzle) was found, how many nozzles it was found in, and how long the unit ran before it was found. If the unit is being...

control engineer, There is too much information you haven't provided for us to be of much help. You haven't even told us what kind of turbine control system is in use on the turbine at your site to be able to say, "Change [parameter] or [that parameter and that parameter]." If the gas fuel...

KKS, In general, GE has had a long-standing policy of people remaining in their role for a period of at least two years before being able to "post" for a new position in the Company. This is to make sure that the "investment" made in training that individual in his or her new role is not lost...

Most of us, when were first hired were anxious to contribute and be relevant and included. Some of us had to be taken aside and reminded, "Better to be thought a fool than to open one's mouth and remove all doubt." Sometimes it takes more than one reminding. For those who are just starting...

Shaheed, Although I dislike the use of maths and vector diagrams here's a link to a pretty good explanation of "generator capability curves" (also known as reactive capability curves)...

Hammad Ali Zaman, When did this problem start? After a maintenance outage? Was a Mark VIe RTD input TB was changed? What changed before the problem started? Have you verified the wiring? GE typically uses a "unique" RTD wiring scheme which must be done exactly correctly? (Many...

Surya, Congratulations on your offer! Expect to have a pretty steep learning curve. Get to know your colleagues very well, known as "developing your network" and let them know what your skills and abilities are so that if you can help them they will know to contact you. When you get...

In a combined cycle power plant providing power to a larger grid the speed of the two generators is a function of the grid frequency. Both generators--and their prime movers--will operate at speeds directly proportional to grid frequency when synchronized to the grid. (Neither generator is large...