Hi guys,
our power transformers, 6.6kV/433V needs to be protected against restricted earth fault (87N) and standby earth fault (51G) and is connected in a 6.6kV HV switchgear.
at the onset of the project all the secondary winding of the protection ct is 5A. There was a change in the design of...
Hi guys,
We were tasked to design an offshore platform with helideck. Client specified in the bid work (but without a specification)that a Helicopter Starting/charging system be installed in the platform with a battery system of 28.8volts & 420Ah (ampere-hour). Our predicament is that there is...
Hello again guys,
I'm evaluating an ABB Unigear 6.6kV HV switchgear (well our client considers the 6.6kV as a high voltage) and I'm quite a bit puzzled by their offer. ABB is offering a 2-tier double level switchgear, meaning the upper and lower panels of the switchgear compartment can be...
Hi guys, just wanted to ask if my new gas turbine generator rated 11500kW, 6.6kV, 3phase, 50Hz, with an NGR can be paralleled with the existing GTG of 10800kW 6.6kV, 50Hz, 3phase, 50Hz also with an NGR. These gen set are use on offshore platforms.
Instrumentation, control and synchro of the...
Hi Guys,
Need some advice on a design stage of 240VAC UPS system.
I have 4 random loads of 19.8kW for the 1st 30mins, 10.85kw for the 1st hour 4.9kW for the next 240mins & 4kW for the final 480mins or 8hrs.
From the formula of Kilowatt = V x I x .8 pf x 0.91 inv.eff
Current I = kilowatt / V x...
