sujesh

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1 Power Quality Improvement of Incoming Supply (TNEB)

Transcript of sujesh

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Power Quality Improvement of Incoming Supply (TNEB)

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Steps planned to Improve Power Quality:

1. Install HT AVR to ensure Voltage variation within ±1%.

2. Install UPS to reduce losses due to Power Brown outs & Black

outs (M/c Breakdown, Tool Breakdown etc.).

3. Upgrade the Voltage from 11KV to 33KV.

Steps Planned to Improve Power Quality

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• Failure of Motor windings in Heat Treatment Machines due to Low voltage (VHF, SQF etc.,). • Imported CNC,PLC M/c’s fails to run without coolant pump due to voltage fluctuation.

• lights are flickering and capacitors burst due to low voltage.

• Frequent tripping of Circuit breakers due to low voltage during full load.

• Frequent tripping of Air conditioner and compressors due to voltage fluctuation.

Problems occurred before installing AVR

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AVR Installation

BeforeAfter

Incoming supply (TNEB)VCB

2

Bus bar

Tr-1 Tr-2 Tr-3 Tr-4

Load LoadLoadLoad

Tr-1 Tr-2 Tr-3 Tr-4

Load LoadLoadLoad

Bus barVCB 2

VCB 1

Incoming supply (TNEB)

6.3 MVA AVR

Additionally Inserted

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AVR system installed

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Voltage stabilization process in LT side

Input voltage to AVR : 9000V to 12000VOutput voltage from AVR : 11000V ± 1% (10890V to 11110V)

Stabilization process : HT voltage LT voltage

conventional : 9000V to 12000V 340V to 470V

Recommended : 11000V±1% 415V±6% (i.e.390V

to 440V)

By AVR : 11000V±1% 410V to 420V

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voltage bandwidth for motors

D

GOOD

ALLOWED

DANGEROUS

410V

420V

390V

440V

340V

470V

Voltage Bandwidth

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Voltage in LT before & after installation of AVRVoltage in LT side

050

100150200250300350400450500

Time

Volta

ge

Before After Required

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After installation of AVRAvoided M/c brownouts, blackouts due to voltage

variation.

Avoided failure of Motor winding and CNC M/c down time due

to voltage fluctuation.

Avoided failure of lights and fans due to low voltage.

Avoided tripping of Air conditioner and compressors due to under voltage.

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Up gradation of voltage from 11 KV to 33 KV

6.3 MVA AVR

33 KV TNEB SUPPLY

RMG 33 KV VCB

6.3 MVA,33KV / 11KV TRANSFORMER

11 KV VCB

VCB

VCB VCB VCB

To Power House To

DI building To E & D

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Increasing the Capacity of UPS

Bus bar

Tr-1 Tr-2 Tr-3 Tr-4

Load LoadLoad

160 KVA

Existing

160 KVA 550 KVA 160 KVA

Load

Existing CapacityRotary = 870 KVAUPCR = 160 KVA

Planned CapacityRotary = 2360KVAUPCR = 320 KVA

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Thank You…