GSU Transformer energization - Electric power & transmission
2007年5月23日 · I have a ST Generator (15.75kV) connected directly to a GSU Transformer by IPBs, and then in the HV side of the GSU Transformer is a circuit-breaker (33 kV). As usually transformer manufacturers specify in their commissioning manuals that the transformer must be energized with no load and kept it unloaded during around 24 hours prior to ...
GSU Transformer - Electric power & transmission & distribution
2015年6月9日 · Hello, I am putting together a specification for a 115/2400 GSU transformer and I was wondering if anyone on here may know if this type of transformer should follow IEEE Std. C57.116-2014: IEEE Guide for Transformers Directly Connected to Generators? Also, what is the difference between normal...
GSU Tap changer control strategy - Review - Electric power
2012年2月17日 · - what are the recommended requirements for GSU transformer (tap-changer or no tap-changer, on-load or no-load) - operation of the tap-changer (if on-load would it be automatic or manual) - strategy of operation (is it the target of the tap changer to control the voltage at the connection point i.e. the point at which the generators feeds into ...
Generator grounding & protection with a wye-wye …
2005年12月14日 · 1. Replace this transformer with a proper GSU in D-YG configuration. 2. Run solidly grounded and live with the high ground fault currents. 3. On thorough analysis of the electrical system, it may be possible to use the transformer at hand and leave the neutral end of the generator ungrounded.
FINDING A CORRECT BUSHING CT RATIO FOR A GSU …
2014年8月22日 · Hello, I am in the process of reviewing specification for a GSU transformer for a hydropower plant. As calculated, the primary current on the low voltage side(13.8 kv)is equal to 6521 amp and the secondary current on the high voltage side (241.5 kv) is equal to 373 amp. What ratio bushing CTs...
Energisation of Power Transformer 4 - Eng-Tips
2003年2月20日 · Dear Folks, We would like to energise 300/150/150MVA (220/15/15kV) transformer (GSU) with one of the Generators (110MW,15kV) connected to 150MVA winding of the Transformer. Someone please discuss what are the limitations of energising GSU transformer with Generators. Thanks a Lot.
GSU transformer connection - Electric power & transmission
2007年7月16日 · GSU trasformer: ungrounded wye (4.2kV)/ delta (69kV). There is one station service transformer on the 4.2kV system (delta-grounded wye 4.2kv-600V). Apart from this the rest of the 4.2kV system is only instrument transformers and some surge arrestor and capacitors.
GSU Tap changer - Electric power & transmission & distribution
2014年12月14日 · Checking the power flow on a GSU transformer with the primary connected to 15.75 kV generator and secondary connected to 220 kV (LTC: 4 x +/-2.5%), at rated generator power @ 0.85 lag p.f., the power flow math. model shows a primary required voltage of 1.1 p.u. (which is greater than 105% of...
Generator + GCB + GSU Transformer + 2 UAT reliability
2013年7月18日 · I have seen a tender for a power plant where the single-line diagram shows Generator + GCB + GSU Transformer + 2 UAT. The only way of feeding generator auxiliaries is through the UAT, as no station transformers of MV lines are available. The connection between Generator + GCB + GSU Transformer + 2 UAT, is made using IPBs.
Genearator Transformer without Tap Changer 1 - Eng-Tips
2008年5月8日 · 3) i) You can maintain the machine terminal voltage at a constant level which is normally needed to prevent over-fluxing in the GSU transformer core (also the generator itself, but the GSU usually saturates first). ii) You can flex the reactive export of the machine without significantly varying the generator terminal voltage.