Seaward HALO II User manual

HALO II
Hook-OnAmmeter
Operating Instructions
Bracken Hill, South West Industrial Estate,
Peterlee, Co. Durham. SR8 2SW. England.
Tel: [phone] Fax: [phone]
www.seaward.co.uk
[e-mail]
[email protected]

HALO II Operating Instructions
2
Limited Warranty& Limitation of Liability
SEAWARDElectronicLimitedguaranteesthisproductfor a
period of 1year. The period of warranty will be effective at the
day of delivery.
© Copyright 2003
All rights reserved. Nothing from this edition may be
multiplied, or made public in anyformor manner, either
electronically, mechanically, by photocopying, recording, or in
any manner,without prior written consent fromSEAWARD
Electronic Limited. This also applies to accompanying
drawings and diagrams.
Due to apolicy ofcontinuousdevelopment SEAWARD
Electronic Limited reserves the right to alter the equipment
specification and description outlined in thispublication
without prior notice and no partof this publication shall be
deemed to be part of any contractfor the equipmentunless
specifically referred to asan inclusion within such contract.

HALO II Operating Instructions
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Disposalof Old Product
This producthas been designed and manufactured with high
quality materials and components that can berecycledand
reused.
When the crossed out wheelie binsymbol is attached toa
product itmeanstheproduct iscovered bythe European
Directive 2002/96/EC.
Pleasefamiliarise yourself with the appropriate local separate
collection systemfor electrical and electronic products.
Pleasedispose of this product according to local regulations.
Do not dispose of this product along with normal waste
material. Thecorrectdisposal of this product willhelp prevent
potential negative consequences for the environment and
human health.

HALO II Operating Instructions
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Operating Instructions
HALO II Hook - On Ammeter
The SeawardHALOIIhook-on ammeterprovides ameansof
measuring current flowon overheadpower linesystems. By
attachmentof standardoperating rods the HALO IIcan be
hooked onto overhead lines to enable safeloadsurveys and
load balance investigations on systems up to 36kV.
The HALO IIhook-on ammeter wasdesigned bythe Electricity
Council Research Centre.
Contents
1. User Notes
2. SafetyNotes
3. Description
4. ElectricalSpecifications
5. Operation
6. BatteryInstallation andReplacement
7. Maintenance
8. Cleaning
1.0 User Notes
These operating instructions are intended forthe use of
competent personnel.
The HALO IIhook on ammeter hasbeen designed to make
measurements in a dryenvironment.
The followingsymbols are usedin these operating instructions
and on the HALO II.
Warning of electrical danger!
Indicates instructions must be followed to avoid danger
to persons.
Important, followthe documentation!
This symbolindicates that theoperating instructions
must be adhered to in order to avoid danger.

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2.0 SafetyNotes
The HALO IIhookon ammeterhasleft thefactoryin aperfectly
safe state. To maintain this state andensure safeoperation of
the unit, all notes and warnings in these instructions mustbe
observed atall times.
Alwaysholdthe HALO II bythe insulated handle
section of the operating rods.
The HALO II must be checked for signs of damage
before the equipment is operated.
Where safe operation of the HALO IIhookon ammeter isno
longer possible it should be immediatelyshutdownand
secured to prevent accidental operation.
It must be assumed thatsafe operation is no longer possible:
-if the HALO II shows visible signs ofdamage, or
-the HALO IIdoes not function, or
-after long periods of storage under adverse
environmental conditions.

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3.0 Description
The HALO IIinstrument is comprisedof the following features:-
3.1 An open core currenttransformer sensing unit for
accurately measuring high voltageconductor current
flow,in the range 0 2000 amps,is moulded into a
special plastic housing.
3.2 A gap in the current transformer plastic housing islarge
enough to accept all conductor sizes up to 58mm in
diameter.
3.3 The housinghas been designed in such away as to
ensure theconductor always liesat the point from
which the HALO II is hung thus minimising errors due to
varying conductor position.
3.4 The output fromthe sensing circuitsuppliesinputs to
solid state circuitry housed in ahighquality PVCgrade
7 tube that conforms to BS3506.
3.5 Current readings between 0and2000 amps are
indicated on a 3.5”LCD display module.
3.6 A membranetype tactileresponse control panel allows
an operatorto switchthe HALOII On /Off and select
between Hold and Track modes.
3.7 HoldMode allowsthe display to store the peakreading
of the R.M.S. current monitored in aconductor over any
given time.
3.8 Track Mode allowsthe display to continuously display
the measured current.
3.9 The HALO II power supply is generatedfroma
replaceable internal 9VDC battery.

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4.0 ElectricalSpecifications
Display 3.5 digit LCD 10mm high characters
Measurement 0 2000 Amps
range
Accuracy± 3% ±1 digits
Operating -18 ºC to +50 ºC (0 ºf to +122 ºf)
temperature
MaximumVoltage 36 kV (Phase to Phase)
Battery 9VDC Alkaline MN1604 6LR61
5.0 Operation
5.1 Press and releasethe On /Off button on the HALO II
control panel. If abattery symbol appearson the LCD
display thenthe battery within the unit mustbereplaced
(see section 6).
5.2 Assembletheoperating rods to the requiredheight for
the overheadline conductor to be monitored before
attaching the HALO II tothe end of the operatingrods.
The HALO II isdesigned for direct attachment to
standard operating rods with splines.
The HALO II must not be used as ahook for general
engineeringpurposes. The load on the hook should
not exceed10kg longitudinalor 5kg inanyother
direction.
5.3 The operator can selectTrackmode by pressing and
releasing theTrack/Hold button until the ˜symbol is
indicated inthe lower left corner of the LCD display.
SelectHold mode by pressing and releasing theTrack/
Hold buttonagain. Thesymbol ˜in the bottomleft
corner of the LCD display nowdisappears.
5.4 The operator can reset aheld currentmeasurement on a
HALO II by pressing the Track/Holdbutton twice. This
re-selects the Hold mode ready for the next test.
5.5 Hoist the equipment upand hookthe HALO IIover the
conductor tobe monitored. The HALO II shouldbe kept

HALO II Operating Instructions
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in place for aminimumof 30 seconds to enable an
accurate reading to be recorded.
Using anew batterythe HALO IIcan monitor a
conductor current for approximately 30hours
before the batteryneeds replacing.
5.6 For best results the hookof the HALO IIshould be
positioned such that itfaces away fromany other
energised line conductor.
5.7 On completion of the monitoring period the operator
should unhookthe HALOII fromthe line conductor and
carefully lower the equipmenttoviewthe current
reading on the LCD display.
If the batterysymbolisvisibleonthe LCD display
then the current reading must be assumed to be
incorrectsince the batteryrequires replacing.
5.8 Once testingis complete press theOn /Off button to
switch the HALO II off.
The HALO II isinternallyscreened to guard against
the affect of electrostaticfields.However itis
recommended that theuse of theHALO II within
high densityelectromagneticor electrostaticfields
be avoided.
6.0 BatteryInstallation andReplacement
Abatterysymbolon theLCD displayof the HALO II
denotes that the batteryrequires charging.
6.1 Accessto the battery compartmentin aHALO II is by
removing the twoscrewsat the end of the tube that
fasten the spline adaptor to the tube.
6.2 With the twoscrewsremoved slidethe spline adaptor
out of the tube. The adaptor has amachined recess that
holds the battery in position.
6.3 Disconnect the batterycontact and removethe flat
battery. Attach anewbattery to the battery contact.

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Insert the battery into the recess and slide thespline
adaptor back into the tube.
6.4 Line up the holes in thetube with the screwthreads in
the spline adaptor and insert screwsand fasten.
7.0 Maintenance
7.1 The HALO II is extremelyrobust but should always be
kept free fromdust and any excessive temperature
variations avoided.
7.2 Ensure the HALO II is kept dry with no surface moisture
on either thebody or the housing ofthe LCD display.
7.3 The body of the HALO IIshould beregularly inspected
to ensure no deep scratches or physical damage.
7.4 If any of theabove conditions have been observed then
the HALO IImust be appropriatelysecured toprevent
any further use.
8.0 Cleaning
8.1 Clean theexternal caseof the HALOII withaclean dry
cloth.
8.2 Avoid using solvents and abrasive scouring agents to
clean the external case of the HALO II.
8.3 Checkthebatterycontacts andmounting compartment
within the HALO II are free of electrolytic contamination.
8.4 Any contamination ofthe battery contacts or
compartment should becleaned with a dry cloth.

205A551 Rev 2