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INTRODUCTION

PowerIT Transformer Control, type TEC

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Goals with TEC-Project

! The project shall integrate and create a common electronic interface to:" The transformer control cabinet" The tap-changer motor-drive mechanism" Monitoring & Diagnostics of the transformer with components" Voltage Regulation" Protection System for the complete transformer

! The product shall as much as possible use modern electronic technique. (Mainly

POW’s MACH 2 system)

! ABB shall have a product in the forefront of technology (MACH 2 system) in combination with a built in unique knowledge (knowledge from the worlds larges transformer and bushing manufacturer and second largest OLTC manufacturer.)

! Aim in the direction to a maintenance free transformer. (Condition Based Maintenance with transformer temp. balance, OLTC contact wear and OLTC temp. balance

! Have an “Intelligent transformer”. (knowledge from the worlds lagers transformer and bushing manufacturer and second largest OLTC manufacturer.)

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Part # 1A Transformer That Thinks Like You !

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Benefits I

! Cooling & Overloading ForecastsStart cooling prior to an anticipated load increaseCooling control based on calculation, result in immediate reactionsCooling control in multiple stepsSimulate different load conditions

! Real Time Status / AvailabilityMeasured parameters are compared to simulated to detect potential malfunctions

! LifetimeAccurate calculation of hot-spot and presentation of consumed lifetime, according to both IEC and IEEE

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Benefits II

! Condition based maintenanceStatus traffic light provides status indication on TFO & OLTCIn-depth information also available

! Event recordingsKeeps track of the order of transformer trip activities

! Operation and UpdatesEasy-to-understand system from a transformer model on the screenIn-depth information by clicking on the objectComplete transformer and OLTC documentation incorporatedSystem hardware and software based on well-proven ABB industrial standard

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Benefits III

The system has a unique built-in knowledge, helping

You to utilise the assets in a more efficient manner

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Part # 2Feature Overview

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Project Objective

One interface to the complete transformer with:! ABB´s unique TFO & OLTC knowledge ! Monitoring & Diagnostics! Loading forecasts based on fingerprints! Improved transformer control functions! Documentation! Basic protection and regulation

ObjectiveAn IntelligentTransformer

TEC CABINET

Serial communication on Fibre Optic BusCOMMUNICATION MODULECOMMUNICATION MODULE

(For different systems and protocols)(For different systems and protocols)

ON CABINET

ALARM

WARNING

NORMAL

Display

TEC PC in station

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Transformer Control, TEC

TEC CABINET

Serial communication on Fibre Optic BusCOMMUNICATION MODULECOMMUNICATION MODULE

(For different systems and protocols)(For different systems and protocols)

ON CABINET

ALARM

WARNING

NORMAL

Display

TEC PC in station

Sensors

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TEC Sensors

T Top Oil

Top Oil Temperature •Temperature Balance•Hot-spot•Cooling Control

Bottom Oil Temperature •Temperature Balance•Hot-spot

CT

TAir

Current Transformer•Temperature Balance•Hot-spot •Load

Air Temperature•Temperature Balance Trafo

TECCabinet

TrafoCabinet

Station battery

LTC

OLTC Position •Contact wear

Cooler status •Temperature balance

OLTC Temperature •OLTC Temperature balance

PC in Control Room

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Transformer Temperature Balance

Cooling from Radiators or Coolers

Losses

Cooling from Bushings

T Top Oil

T Bottom Oil

T Air

Cooling from the Tank

Calculated oil temperature are compared with measured. A difference can indicate problem with coolers/radiators that willrestrict the overload capability.

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Display Logic on Cabinet

A.

B.

C.

E.

G.

D. I / Irated

F.

Actual Display

A T O P O I L T E M P+ 6 5 o C + 8 5 o F

B 1 H O T - S P O T H V+ 7 5 o C + 1 0 3 o F

B 2 H O T - S P O T L V+ 8 0 o C + 1 1 2 o F

B 3 H O T - S P O T R V+ 7 0 o C + 9 4 o F

C B O T T O M O I L+ 5 0 o C + 5 8 o F

D L O A D I / I r a t1 2 0 %

E O L T C P O S I T I O N2 1

F O P E R A T I O N S1 2 3 4 5 6

G H Y D R O G EN H 21 0 0 P P M

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Station Interface

! Actual status of the transformer

! Historic data (load and temperatures etc.)

! Status of coolers (reduced cooling cap.)

! Hydrogen in oil (if sensor connected)

! Hot-spot forecast , with thermal ageing

! Contact Wear in Tap-Changer

! Thermal Balance in Tap-Changer

! Condition in TEC Control Cabinet

Monitoring & Diagnostics

General information in the station interface

! Complete transformer documentation

! Tap-changer maintenance films

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Station Interface, example of panels

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Complete Transformer Documentation

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Cooling Control

SpecialCT Thermometer pocket

with heating

Calibrationresistor

TransformerCabinet

Today With “TEC”

SignalfromCT

TEC Cabinet

T Top Oil

T Bottom Oil Thermometer pocket

Hot-spot temp

ON CABINET

ALARM

WARNING

NORMAL

Display

Algorithms

Group 1

2 Cooler Groups can be controlled

Group 2

Group 1 Group 2

Up to 6 Cooler Groups can be controlled

Group 4 Group 5

Group 3

Group 6

Winding Hot-Spot

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Cooling Control

Differences from traditional Cooling

• More sophisticated cooling control• Calculated Hot-Spot• No temperature gauges• Logic to avoid pumps to start at the same time• All coolers used through permutation• Logic to start motors at regular basis• Reduced Maintenance,• Reduced losses from motors• Reduced Noise

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Cooling Status

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Hot-Spot forecast

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Overload Capability

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Voltage Control

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Trip and Voltage ControlToday on transformer from ABB

Buchholz Pressurerelay Relief vent

With TEC

Resistor

TEC Cabinet ON CABINET

ALARM

WARNING

NORMAL

Display

Event logg in TEC

Trip signal the traditional way to the Breaker also for TEC

! Voltage Control for a single transformer

! R compensation! Over Current Blocking! Under Voltage Blocking! Manual Operation

Control Voltage +Bandwidth

Bus VoltageControl Voltage

Control Voltage -Bandwidth -

T delayT start

T reset

Time

VoltageVoltage Control in TEC

Trip

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Part # 3Summary

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12 good reasons to use TEC on ABB tfo´s

! Hot spot and top oil forecasts at overload conditions! TEC’s functionality is made from a “fingerprint” of the transformer ! Relative ageing status of the transformer in service and in forecasts! One interface to the complete transformer! Better cooling control

! Up to 6 cooler groups with more sophisticated cooling algorithms! All coolers used on a regular bas! Hot-spot calculated

! All documentation in one place! History data about loading and temperatures in the transformer! Protection system with event logg! Simple Voltage Control! Information about the actual transformer condition in the control room! Prediction for service and contact exchange in the tap-changer! Detection of reduced cooling capacity

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