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 TMU 100Monitoring system for high-voltage bushingsand on-load tap changers

Transformer Service

Faults at bushings and on-load tap

changers are often the cause of 

transformer failures. Online monitoring

provides timely detection of even rapidly

developing damage, thus enabling both

downtimes and costs to be minimized.

 The TMU 100 measuring instrument

determines with high accuracy any

changes in tangent delta and thebushing’s capacitance. With the same

accuracy, mechanical vibrations from

switching operations of the on-load tap

changer are measured in order to detect

any incipient defects.

Customer benefits

– Early detection of faults at bushings and on-load tap

changers – even in the case of rapid alterations

– Optimized maintenance costs and minimized downtimes

– Goal-driven planning of safety disconnections and

maintenance work 

– Monitoring of the wear margin

– Use on bushings as from 110 kV and on-load tap changers

from different manufacturers

– Innovative evaluation procedures utilizing comparative andvibration analyses

– Flexible configuration options to suit the number of bushings

and on-load tap changers, thanks to modularized construction

– Minimized installation and cabling work 

 The system’s ve ry high resolut ion accuracy also enables

bushings in the extra-high-voltage range with well over

100 grading layers to be reliably monitored. The innovative

online vibration analysis not only permits mechanical stiffness

and contact erosion to be detected, but also provides prompt

analyses of maladjustments and contact damage at any on-load

tap changers.

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Functional principle

Monitoring of the bushings is based on precise measurement

and evaluation of the leakage currents. The parameters

calculated from this, such as ∆tanδ and ∆C, are utilized as

diagnostic parameters for status evaluation.

 Thanks to the principle of comparative measurement, the

procedure is ultra-accurate and not affected by fluctuations

in the supply voltage.

On-load tap changers are monitored by measuring and

evaluating vibration signals and motor currents. The innova-

tive vibration analysis offers more comprehensive diagnostic

options than conventional online procedures. In conjunction

with evaluation of the motor current, any incipient faults can

be analyzed and recorded in detail.

Despite the principle of comparative measurement, the

devices installed do not require any cabling between them.

 The measured values are synchronized by GPS.

Monitoring system for high-voltage bushings

and on-load tap changersSystem description

Data management

 The signals from the individual TMU 100s are transmit ted to

the central diagnostic system, where they are processed.

 The measured data from up to 50 TMU 100 devices can be

evaluated and presented here.

Communication with the operator’s SCADA system is also

handled through the d iagnostic system. Each TMU 100

measuring instrument is installed at one transformer, anddepending on the configuration involved can monitor a different

number of bushings and on-load tap changers.

 The dev ice provides the requis ite options for system diag-

nostics and maintenance, which can be executed over the

local display and via your web browser. The configuration of 

the TMU 100s installed in the bay can be centrally managed.

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GeneralOperating voltage 90 - 264 VAC 50/60Hz

100 - 370 VDC

Operating temperature (ambient) -50 °C … +70 °C

Communication interfaces ETHERNET 10/100 Mbit/s

(copper or fiber-optic cable)

Communication protocols TCP/IP, IEC 61850, DNP3, HTTP

 Approvals UL/CSA, CE

Degree of protection IP 20

Dimensions (H x W x D in mm) 224 x 184 x 175

Monitoring bushings

Resolution 18 bitSampling rate 50 kS/s

 Accuracy

– Phase shift ±0,01 °

– Amplitude change ±0,1 %

– ∆tanδ ±0,035 %

– ∆C ±0,2 %

Monitoring on-load tap changers – vibration sensor input

Resolution 18 bit

Sampling rate 50 kS/s

 Accuracy ±1 %

Full scale ±50 gFrequency range up to 25 kHz

 Vibration sensor type ICP

Monitoring on-load tap changers – current transformer inputResolution 18 bit

Sampling rate 50 kS/s

 Accuracy < ±1 %

Full scale up to 50  A 

Frequency range 50/60 Hz

Standards for environmental tests

IEC 60068-2-1, IEC 60068-2-2, IEC 600-2-78, IEC 60068-2-30

Standards for type tests

IEC 61180-1, IEC 61180-1, CISPR 22, IEC 61000-4-2,

IEC 61000-4-3, IEC 61000-4-4, IEC 61000-4-5, IEC 61000-4-6,IEC 61000-4-11, IEC 61000-4-16, IEC 61000-4-17,

IEC 61000-4-18, IEC 61000-4-29

Monitoring functions – bushings

– Change in capacitance

– Change in tangent delta

– Capacitive leakage current

– Comparative method

Monitoring functions – on-load tap changers

– Vibration analysis

– Motor current– On-load tap changer position

– Time in position

– Position count

Monitoring system for high-voltage bushings

and on-load tap changers Technical specification

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For more information please contact:

 ABB AG

Transformers

 Trafoweg 4

06112 Halle, Germany

Phone: +49 345 5686 0

Fax: +49 345 5686 120

Email: trafo-service.detfo@de.abb.com

www.abb.com/transformers

Note:

We reserve the right to make technical changes or

modify the contents of this document without prior

notice. With regard to purchase orders, the agreed

particulars shall prevail. ABB AG does not accept

any responsibility whatsoever for potential errors or

possible lack of information in this document.

We reserve all rights in this document and in the

subject matter and illustrations contained therein.

 Any reproduction, disclosure to third parties or

utilization of its contents - in whole or in parts - is

forbidden without prior written consent of ABB AG.

Copyright© 2013 ABB

 All rights reserved

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