Catalog_BM_E_2006.07.20_rev2

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BM On-Line Condensive Bushing PowerFactor and Capacitance MonitorsCondensive bushings are accessories applied on high and extra-high voltage equipment, such

as power transformers, shunt reactors and high voltage circuit breakers. In general, despite the

equipments individual cost being relatively low as compared to the overall cost of the equipment to

which it is attached, a failure in the bushings insulation can bring about severe damage to the

equipment.Capacitance and dissipation factor (tangent delta) are important factors in the early detection

of deterioration of the insulation in bushings, current transformers and other apparatus. The Treetechs

Bushing Monitor BM allows these parameters to be monitored on-line during regular operation. This

condition based assessment technique allows potentially catastrophic failures to be avoided, bydetecting problems while still in the incipient phase.

Main Features

Autonomous monitoring system, to be installed on the body of the equipment (transformer, reactor,etc.). Does not require installation of computers and/or special software for operation;

Operating temperatures -40...+85C;

Universal voltage input, 38 to 265Vdc/Vac; Spare bushings pre-programmed for operation in case of single-phase transformer banks;

Modular system: configurable for monitoring of 3, 6 or 9 bushings;

Protection against bushing tap opening, with activation indicated by an alarm;

Inputs for 2 Pt100 0C temperature sensors, allowing recording and correlation of insulation variation with changes in ambienttemperature, oil temperature or others;

Local indication on displays: current values for capacitance (C1), tangent Delta (C1), evolution trends for capacitance and tangent

delta, forecasted time to reach alarm levels, phase-to-ground and phase-to-phase voltages, leakage currents and temperatures;

8 output contacts, 1fixed (NC) for autodiagnostic and 7 configurable (5 NO and 2 NC) for alarms by absolute values, high evolutiontrends or low leakage curents. Operation mode programmable NO or NC;

2 programmable analog outputs for remote readings of capacitances and tangent delta. Configurable output range: 0...1mA,0...5mA, 0...10mA, 0...20mA or 4...20mA;

Internal clock and non volatile memory for storage of history of capacitance and tangent delta data and alarm events;

Serial communication port selectable RS485 or RS232 with Modbus RTU and DNP3.0 protocols;

Communication via fiber optic cable, using external electrical-optical converter;

Simplified programing divided into basic settings (sufficient for most applications) and advanced parameters.User password protected programming menu.

CA-008 2006/07/20 Rev. 201 Sistemas Digitais

Bushing Monitor- BM

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BMThe constructive structure of condensive bushings gives rise to the appearance of a capacitance between the bushings central conductor and

ground, as shown in figure 1. Once the bushing has been energized, this capacitance allows the passage of a leakage current to ground,

90 ahead of the voltage as shown in figure 2. In this same figure, we can see that, due to losses in the dielectric, this leakage current also

has a resistive component, in phase with the voltage.

Operating Principle

Therefore, any change in these two parameters of the insulation of the bushing (capacitance and tan d) causes a corresponding

change in the leakage current (capacitive and resistive components, respectively).

The Bushing Monitor BM operates by continually measuring the leakage currents of the three bushings in a three-phase set, through

adapters connected to the test taps or bushing voltage taps. Processing the readings of the leakage currents allows the variationsoccurring in capacitance and tangent delta to be charted, which associated to programming of initial values for these variables

allows on-line indication of their current values. Initial values can be obtained from factory tests for new bushings or from off-line

tests performed at BMs installation.

One of the techniques employed in processing the readings is using the sum of leakage currents. This technique is based on the fact

that any change in one of the leakage currents is mirrored equally in the sum of the 3 currents, as shown in figure 3. This allows

detection of even small changes in the value of tangent delta, since the resistive portion of the leakage current, which is associated

to the insulation's tangent delta, has a very small participation in the overall leakage current. This way, variations that might not be

detected directly in the leakage current are detectable in the sum of currents. Variations detected are always imputed to only one of

the bushings in the three-phase set, chosen according to the angle of the sum current Change Vector .

Figure 3 - Leakage currents of three bushings in a three-phase system and their sum;(a) For a given initial condition;(b) With change in phase A bushing's capacitance and dissipation factor

02 Sistemas Digitais

CONDUCTING LAYERSFOR EQUALIZING

ELECTRICAL FIELD

OIL IMPREGNATEDPAPER INSULATION

LAYERS

Figure 1 - Constructive structure ofCondensive bushing

C1

Ifuga

Vf

Figure 2 Equivalent circuit of anenergized condensive bushing

(a)

CA-008 2006/07/20 Rev. 2Bushing Monitor- BM

(b)

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BM Topology of theBM SystemThe BM bushing monitoring system has a modular conception, and is composed of three basic parts (see figure 4):

Adapter for test tap or voltage tap provides the electric connection to the tap of the bushing, also ensuring its mechanical rigidity and

weatherproofing seal. It incorporates protection against overvoltages and overcurrents due to transient phenomena and also against accidental

opening of the measuring circuit, preventing the tap from remaining open. This protection can provide a low impedance path for the leakage current

for unlimited time. In case of operation the Measurement Module closes its autodiagnostic contact and the Interface Module provides visual alarm

besides closing the user programmed contacts.

Measuring Module BM-MM receives the leakage currents from the three bushings in a three-phase set, carries out measuring of these currents and

a first level of mathematical and statistical processing of the information, making this data available to the Interface Module (BM-HMI) through a

serial communication port RS485;

Interface Module BM-HMI receives information from one, two or three measuring modules (BM-MM) and carries out their mathematical and

statistical processing, making the results available as the current values for capacitance and tangent delta for each bushing displaying these on the

front panel displays.

Figure 4 Component parts of the Bushing Monitoring System BM;

(a) Tap Adapter; (b) Measuring Module BM-MM; (c) Interface Module BM-HMI

Figure 5 displays the connections between the different parts for a three-phase transformer monitoring 3 bushing sets. Figure 6

shows an example for banks of single-phase transformers

Sistemas Digitais

Figure 5 Connections between the parts comprising the Bushing Monitoring System BM

(A) (B) (C)

TRANSFORMER

CONTROL CABINET

MEASUREMENTMODULE 1

INTERFACEMODULE

DRY CONTACTSANALOG OUTPUTS mA

SERIAL PORTS

RS485

PRIMARY SECONDARY

TERTIRY

RS485

MEASUREMENTMODULE 2

MEASUREMENTMODULE 3

TAP

ADAPTERS


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BM

Sistemas Digitais04


Figure 6 Example of Bushing Monitoring System BM for banks of single-phase transformers

PHASEA

B

ANK1

CENTRALIZING

CABINETBANK

1

MEASUREMENT

MODULE

1

INTERFACE

MODULE

DRYCONTACTS

ANALOG

OUTPUTSm

A

SERIALPORTS

RS485

HV

LV

PHASEB

PHASEC

HV

LV

H

V

LV

MEASUREMENT

MODULE2

PHASEA

BANK2

CENTRALIZ

ING

CABINETBA

NK2

MEASUREMENT

MODULE

1

INTERFACE

MODULE

DRY

CONTACTS

AN

ALOG

OUTPUTSmA

SERIALPORTS

RS485

HV

LV

PHASEB

PHASEC

HV

LV

HV

LV

MEASUREME

NT

MODULE2

PHASEA

CENT

RALIZING

CABINET

RE

ACTORSBANK

MEASUREMENT

MODULE3

RS485

HV

PHASEB

PHASEC

HV

HV

REACTO

R

BANK

SPARE

TR

ANSFORMER

SIGNALSFROM

BUSHINGSOFSPARE

XFMR

BROUGHTTO

SHORTING-TYPE

TERMINALBLOCKS

ATINDIVIDUAL

CONTROLCABINET.

IN

CASEOFSPARE

UNITBEING

PUTIN

SERVICE,THESE

SIGNALSMUSTBE

CONNECTED

TO

THE

CORRESPONDING

M

EASURING

MODULE

IN

PLACEOFTHE

UNITTAKEN

OUTOF

SERVICE.

HI S

U S HING

T

B

EXC HANG EO PER

TA

IO N

M

U

T

E

FO RME

I

S

B

IN

D

N

T

C O R

S PO ND

G

HE

RE

IN

M

EN

INT

RFAC E

U

O F

E

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BM

Interface Module BM-HMIInput Voltage:Maximum Consumption:Operating Temperature:Protection Level:Fixation:Wire size - removable connectors:Temperatue measurement:

Input:Measurement range:Maximum error @ 20CDeviation by temperature variation:Connection options:

Output relays:

Type and functions (standard):Maximum switching power:Maximum switching voltage:Maximum conduction current:

Analog outputs:Variable:Output range:Maximum error:Maximum load

Serial Communication Ports:Communication Protocols:

Measurement Module BM-MMInput Voltage:Maximum Consumption:Operating Temperature:Protection Level:Fixation:Wire size:AC current measurement inputs:Monitored quantities:

Capacitance:Tangent Delta:

Output relay:

Mass MemoryRecording interval:Capacity:

38 to 265 Vac/Vdc 50/60Hz

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BM Connection Diagram


Application example monitoring 3 sets of bushings on a three-phase transformer


W

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BM Dimensions


Interface Module BM-HMI

Measurement Module BM-MM


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BM

Surge Immunity (IEC 60255-22-5):phase-neutral surges:phase-ground and neutral-ground surges:

Electrical transients Immunity (IEC 60255-22-1) and (IEEE C37.90.1):1st cycle peakFrequency:time and repetition rate:decay to 50%:

Voltage Impulse (IEC 60255-5):

Wave form:Amplitude and energy:Number of pulses:

Insulation Voltage (IEC 60255-5):Industrial frequency insulation voltage

Irradiated electromagnetic field Immunity (IEC 61000-4-3/IEC60255-22-3):Frequency:Field intensity:

Conduced electromagnetic perturbations immunity (IEC60255-22-6):

Frequency:Field intensity:

Electrostatic Discharge immunity (IEC 60255-22-2) and (IEEEC37.90.3):Air mode:Contact mode:

Fast electrical transient immunity (IEC60255-22-4) and (IEEEC37.90.1):Power supply, inputs and outputs:Serial communication port:

Climatic test: (IEC 60068-2-14):Temperature range:Total test time:

Vibration response: (IEC 60255-21-1):Application mode:Amplitude:Intensity:Duration:

Vibration resistance: (IEC 60255-21-1):Application mode:FrequencyIntensity:Duration:

Type Tests


1 kV, 5 per polarity (+/-)2 kV, 5 per polarity (+/-)

2.5 kV1.1 MHz2 seconds, 400 surges/sec.5 cycles

1,2 / 50 ms5kV3 negative e 3 positive, 5s interval

2 kV 60Hz 1 min. to ground

26 to 2000 MHz10 V/m

0.15 to 80 MHz10 V/m

8 kV, ten discharges per polarity6 kV, ten discharges per polarity

4 kV - 2,5kV2 kV - 5,0kV

-40 to +85C120 hours

3 axis (X, Y e Z), sinusoidal0,075mm from 10 to 58 Hz1G from 58 to 150 Hz8 min/axis

3 axis (X, Y e Z), sinusoidal10 to 150 Hz2G160 min/axis


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BM


Order specification

The Bushing Monitor BM is a universal device. Its features are selected by using the programming menus. These adjustments

can be made directly on the device's front panel or by way of the serial communication ports RS232 or RS485. The power feed

input is universal.

Therefore, in purchase orders for the equipment only the following need to be informed:

Quantity of Measurement Modules BM-HMI (with each BM-HMI receiving signals from 3 bushings on a three-phase set);

Quantity of Interface Modules BM-HMI (with one BM-HMI being able to connect to 1, 2 or 3 BM-MM modules).

Number of Adapters for bushing taps and the respective manufacturers, models of bushings to monitor and type of tap

(voltage or test tap).

Example of order specification :

For one transformer (or bank of transformers) where is necessary to monitor three 500kV and three 230kV bushings

the order specification could be:

- 2 Measurement Modules BM-MM- 1 Interface Module BM-HMI

- 3 Tap adapters for bushings ABB brand, type GOE with voltage tap

- 3 Tap adapters for bushings Trench brand, type COTA with test tap


Specification subject to change without notice

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BM

Sistemas Digitais


BrazilTreetech Sistemas Digitais Ltda.

Praa Claudino Alves, 141 - CentroCEP 12940-040 - Atibaia - SP

Fone: +55 11 4413 5787E-mail: [email protected]

www.treetech.com.br

United StatesTechnical Sales - NorthwestP.O. Box: 230427 - Portland

Phone: 503 345 9710E-mail: [email protected]

www.treetechusa.com

MexicoMonitoreo e Control de Transformadores S.A. de C.V.

Calle Sur 4, 9 - Zona IndustrialCP 43805 - Tizayuca - Hydalgo

Tel.: +52 55 5300 8733

E-mail: [email protected]

PakistanShaukat Associates

306 Gul Plaza - Civic CentreNew Garden Town - Lahore

Tel.: 042 5860662 Fax: 042 586 6649E-mail: [email protected]

ParaguayEMQUIMICA

Av. General Santos, 785 - Las MercedesP.O. Box 901 - Asuncin

Tel.: 595 21 214 814E-mail: [email protected]

PeruLogytec - Instrumentos Electro-ElectrnicosIsidoro Surez, 219 - San Miguel - LimaTel.: 511 452 3111 Fax: 511 464 4889

e-mail:[email protected]

Russia, Ukraine and other countries of CEI(Newly Independent States)

Tridex Ltd.13 Minskaya St., Zaporozhye 69015

Ukraine

Tel./Fax: +38 (0612) 13-91-05+38 (0612) 12-65-01

e-mail: [email protected]

Catalog_BM_E_2006.07.20_rev2

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