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TEC, INTELLIGENT MONITORING SYSTEM

September 2008

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TEC, philosophyTEC was launched by ABB in year 2002 to improve transformers performance. More than 250 units are now in service. TEC philosophy is based on the following points:

� TEC monitors just enough parameters to perform three basic functions:

� Early detect potential malfunctions that may trigger a more detailed investigation or intervention.

� Real time condition assessment to allow condition-based maintenance

� Overload and temperature forecast to increase availability of transformer

� Besides monitoring, TEC can perform an advanced control of the cooling equipment

� TEC is an open system that can integrate signals from many other sensors

� TEC is available for brand new and existing transformers, both ABB and other brands

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Basic monitored parameters� Top oil temperature� Bottom oil temperature� Ambient temperature (sun and shadow)� Current on HV, LV and TV windings� Gas content in oil� Moisture in transformer oil� OLTC position� OLTC temperature� Moisture in OLTC oil� Condition (temp. & moist.) in TEC cabinet

Calculated parameters� Hot-spot temperature ( all windings)� Insulation aging at winding hot-spot� Overload capacity� Bubbling temperature� Moisture content in paper� Total moisture in transformer� Load

Other functionality� Transformer thermal balance� OLTC thermal balance� OLTC contact wear� Warning, Alarm and Trip out-put� Diagnostics and recommendations� Event recording� Local and remote access to data� Cooling supervision

TEC, functionality

� Special functions are also available ( bushing monitoring, PD, oil level, webcam, IR cam, 3/8-gas DGA, fiber-optics……….)

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T Top OilTop Oil Temperature

Bottom Oil Temperature

CT

TAir

Current Transducers

Air Temperature

TrafoCabinet

OLTC Position

Pump and Fans status

OLTC Temperature

OLTC Moisture in Oil

Hydran M2/S2

• Dissolved gas content

• Moisture in oil

Few sensors – high functionality

TEC, basic sensors

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TEC Cabinet

OptionRelay box with 6 dry contacts to distinguish between AlarmsSensors

Cables with quick connector to transformer cabinet

Optic fibre, all information

Sum Trip signal, dry contact

Sum Alarm signal , dry contact

Sum Warning signal , dry contact

Cooling controlRelay box with 6 dry contacts

•Internet explorer

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TEC Control O N CABINET

ALARM

W ARNING

NO RM AL

Display

TEC on transformer Today on transformer

Protection System, Trip

Station

battery

SCADABreaker

Buchholz Pressure relay Relief vent

Resistor

Hot-spot & top oil trip

Top oil Hot-spotBuchholz

Pressure relay

Relief vent

Customer connects in Transformer cabinetCustomer connects in TEC cabinet

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Ethernet

Advanced PC - TEC3/8 x 4-20mA

Corporate network(Internet Explorer)

DGA3 or 8 Gases

HUB

Alarm signals

Bushing Leakagecurrent or PD

6 x Alarm signals

TEC

Hot spot Temp.Fiber-optics

4-8 x 4-20mA

DB

Corporate network

Integration of other sensors

Webcam

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Communications: PC

� Fiber-optics between TEC and converter (located in control room)

� LAN ( Ethernet ) between converter and PC

Fiber optic connection

Converter box

Electric Bus TCP/IP

Control room

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Communications: Phone-Modern or Modern-GSM

� Fiber-optics between TEC and converter (located in control room)

� LAN ( Ethernet ) between converter and modern

� Dial-up via Phone modern…….

……or GSM modern

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Communications: Local network, one or more TEC’s

� Fiber-optics between TEC and converter (located in control room)

� LAN ( Ethernet ) between converter and switch/hub or router

� Switch or router connected to local network

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Communications: Corporate Network & SCADA

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Communications: SCADA protocol translator

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User friendly interface

No special computer is needed

View panels

Menus Trafo identification & date

Aging & load capacity

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Tap Changer Temperature Balance,

Keep track of the tap-changer temperature and compared with a model to indicate over temperatures in the tap-changer

Temperature Balance

Only ABB Tap Changers

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Tap changer contact wear calculation and maintenance prediction

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Improved Cooling Control

Enhancements from traditional cooling

• Up to 6 Cooler Groups can be controlled

• Every one can be controlled independently

• Starts on top oil, hot-spot and forecast

• All coolers used through permutation

• All cooler groups evenly used

• Logic to run motors each week

• Time in service shown in station interface

• Time delay between cooler group start

• More stable temperature, reduced breathing

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Event list

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Cabinet conditions

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Hydrogen reading with trends- Load

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TEC, features

� TEC has a simple architecture, easy to install and use.

� TEC is flexible modular and expandable � Monitoring level can be selected according to

necessities

� Sensor, warning and alarm settings can be easily reconfigured

� New sensors can be added in the future

� ABB transformer knowledge is integrated in the TEC and provides diagnostics and recommendations

� TEC can work by itself, connected to a computer or within a network (intranet)

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Main benefits

� Early detection of malfunctions

� Overload assistance

� Increased availability

� Condition assessment

� Advanced cooling control

� Real time data

� Remote access

� Stored data over long time, event log

� Prognosis intelligence

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