Harmonic problem

Tata Iron & Steel Co Ltd Jamshedpur, thro' CPRI


Nissho Iwai, Nissin Electric Corp., and Hitachi Japan supplied 17mvar SVC System comprising of SVC Transformer of Z=51.3% Dd0-sec open thyristor controlled for reactance value control with 2HF-4.0mvar, 5HF-6.57mvar & 7HF-6.43mvar for Cold Roll Mill (CRM).
3rd party test, analysis & verification for PF, Flicker, Harmonic control for the SVC System with CRM load during its commissioning.

Lloyd Steel Industries Ltd, Wardha

2004 -2010, Repeat jobs.

Electric Arc Furnace 2x60T, 40mva, 33/0.545kv transformer. HRM and Cold Rolled Mill (CRM). Twin 220kv grid incomer I/C with 3nos 80mva,220kv/33kv grid transformers synchronized with 85mw coal fired power plant.
Power quality and harmonic analysis carried out and report with recommendations submitted.

Scan Steels Limited, Rourkela


SIP Sponge iron plant, 3nos 12ton Induction furnace each with 4.5mw, 4.75kva 11kv/2x1.0kv, Dd0yn11 transformers and Con Cast plant.
Harmonic Audit with the upstream 8mw,11kv power plant synchronized with Grid through a 10mva, 33/11kv grid transformer.

Eliminate Electrical Failure

Electrical Failure

Abstract: An Electrical Arc Furnace near a hyperactive railway traction line was facing electrical failure from an unusual power quality harmonic distortion problem. The Gigantic 22kA copper bus bar used to overheat visibly red-hot, vibrate audibly loud loosening nuts and bolts and wear out affected plates.

Solve VFD Drive Failure

VFD Drive Failure

Abstract:- An ACSR conductor manufacturing plant was facing high incidence of DC motor and AC VFD Drive Failure due to bad power quality and high harmonic distortion. The company is a world leader in non-ferrous metal industry. It manufactures ACSR conductors for HV and EHV power transmission and distribution lines. It had been facing a high incidence of operational problem across its plants A and B. It affected all electrical and electronic equipment with its conductor making process.

Increase Productivity through Harmonic Solution

Increase Productivity

Abstract- Harmonic solution is an engineer's approach to total productive maintenance (TPM) to Increase Productivity. No stoppage. No breakdown. No quality rejection. A 3500 TCD sugar milling unit was operating at 3000 TCD due to frequent drive stalling problem with dc mill motor. To increase productivity and sugar recovery, it installed a 2000A passive tuned harmonic filter in 2010, at a 3MW 415V Turbine Generator (TG).

Mitigate VFD Harmonic

VFD Harmonic

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.