Voltage sag tripping

Bannari Amman Sugars Ltd, Tiruvannamalai

Repeat 2011 Tamil Nadu

PROJECT DETAILS
4500tcd crushing capacity green field cane sugar plant with co-generation power plant and grid synchronizing transformer. Supplied 4nos 930A, 690V Tuned Harmonic Filters across 2nos 3.15mva, 11kv/690v - 690v converter transformers.
RESULTS ACHIEVED
Each converter transformer connected to a sets of 750kw dc mill motors (through a doublet converters) and a 225kw GRPF dc motor. Green field project objectives were 10% Energy savings, Elimination of DC drives card failure and voltage sag tripping.

Bannari Amman Sugars Ltd, Sathayamangalam

Repeat 2009 -2010  Tamil Nadu

PROJECT DETAILS
4000tcd crushing capacity cane sugar plant with 20mw Turbo Generator Co-generation power plant. Supplied 4nos 790A tuned harmonic filters across three winding converter transformers 2nos, 2.5mva 11kv/433v.
RESULTS ACHIEVED
First transformer connected a 750kw DC Motor through a doublet converter and Second one to 670kw and 450kw dc mill motors across its two secondary winding. 10% Energy savings verified. Eliminated DC drives electronic card failure and voltage sag tripping.

Firstsource, Bangalore

2006 -2009, Repeat jobs.

 

PROJECT DETAILS
Three BPO facilities across Bangalore. 24/7 Electro-mechanical operations and maintenance
RESULTS ACHIEVED
O&M at optimized holding cost.

Coca Cola 8plants across India

2000- 2002, Repeat Jobs.

PROJECT DETAILS
RGB, PET and Cannister beverage lines. Facing frequent tripping and failures with PET SIDEL M/C, and vfd drives in the bottling process lines.
RESULTS ACHIEVED
12% Energy Savings verified. Installed Harmonic Filter and resolved all failure issues.

Turbo energy Ltd, Paiyanoor

Mahabalipuram, 2013 to 2017, Repeat jobs. Faced problem with UPS active harmonic filter.

PROJECT DETAILS
Was facing CNC, UPS & chiller vfd drives electronics card failures, lighting ballast, and motor burning issues and in addition voltage sag (fluctuation) tripping for CNC m/c. Local Utility company/ TNEB mandated limiting harmonics at it 11kv.
RESULTS ACHIEVED
Installed 831A main transformer and a 88A chiller end harmonic filters, mitigated harmonics within IEEE 519 norms, and eliminated all failures.

Denso Kirloskar Ltd., Bengaluru

2002- 2017. Repeat jobs. Faced problem after installing 1200A active harmonic Filters and 1350kvar STATCOM.

PROJECT DETAILS
Passenger Car Common Heat Exchanger & car HVAC manufacturing plant. Facing thyristor and electronics card failures with its Thyristor controlled furnace. Again with it expanded capacity with active filter & STATCOM in 2015 started facing harmonic problems
RESULTS ACHIEVED
In 2002 installed tuned harmonic filters & resolved voltage fluctuation/sag tripping & thyristor failures with NBF Furnace. In 2015 undertook PQ harmonic analysis with expanded plant capacity and supplied harmonic filter for NBF Furnace & solved problem.

Problem of electrical blast from VFD Harmonic; and a methodology for troubleshooting and increasing productivity

Abstract - VFD Harmonic forced a power plant to shutdown due to power quality failure. Starting with drive tripping it blasted switch gear, bus bar & electrical panel. This IPP with a 25mw, 11kV, 50Hz power plant and 5000TCD sugar milling unit had completed its first anniversary without harmonic problem. But during 2nd year's operation, it started-off with a massive blast of a 6300A Air Circuit Breaker (ACB). It was at the incomer of an electrical panel. The 415V PCC panel was supplying to sugar plant's process load.