HALO II
Hook-On Ammeter
Operating Instructions
Bracken Hill, South West Industrial Estate,
Peterlee, Co. Durham. SR8 2SW. England.
Tel: +44 (0)191 586 3511 Fax: +44 (0)191 586 0227
www.seaward.co.uk
[email protected]
[email protected]
HALO II
Operating Instructions
Limited Warranty & Limitation of Liability
SEAWARD Electronic Limited guarantees this product for a
period of 1 year. 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 any form or manner, either
electronically, mechanically, by photocopying, recording, or in
any manner, without prior written consent from SEAWARD
Electronic Limited. This also applies to accompanying
drawings and diagrams.
Due to a policy of continuous development SEAWARD
Electronic Limited reserves the right to alter the equipment
specification and description outlined in this publication
without prior notice and no part of this publication shall be
deemed to be part of any contract for the equipment unless
specifically referred to as an inclusion within such contract.
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HALO II
Operating Instructions
Disposal of Old Product
This product has been designed and manufactured with high
quality materials and components that can be recycled and
reused.
When the crossed out wheelie bin symbol is attached to a
product it means the product is covered by the European
Directive 2002/96/EC.
Please familiarise yourself with the appropriate local separate
collection system for electrical and electronic products.
Please dispose of this product according to local regulations.
Do not dispose of this product along with normal waste
material. The correct disposal of this product will help prevent
potential negative consequences for the environment and
human health.
3
HALO II
Operating Instructions
Operating Instructions
HALO II Hook - On Ammeter
The Seaward HALO II hook-on ammeter provides a means of
measuring current flow on overhead power line systems. By
attachment of standard operating rods the HALO II can be
hooked onto overhead lines to enable safe load surveys and
load balance investigations on systems up to 36kV.
The HALO II hook-on ammeter was designed by the Electricity
Council Research Centre.
Contents
1.
User Notes
2.
Safety Notes
3.
Description
4.
Electrical Specifications
5.
Operation
6.
Battery Installation and Replacement
7.
Maintenance
8.
Cleaning
1.0
User Notes
These operating instructions are intended for the use of
competent personnel.
The HALO II hook on ammeter has been designed to make
measurements in a dry environment.
The following symbols are used in these operating instructions
and on the HALO II.
Warning of electrical danger!
Indicates instructions must be followed to avoid danger
to persons.
Important, follow the documentation!
This symbol indicates that the operating instructions
must be adhered to in order to avoid danger.
4
HALO II
2.0
Operating Instructions
Safety Notes
The HALO II hook on ammeter has left the factory in a perfectly
safe state. To maintain this state and ensure safe operation of
the unit, all notes and warnings in these instructions must be
observed at all times.
Always hold the HALO II by the 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 II hook on ammeter is no
longer possible it should be immediately shutdown and
secured to prevent accidental operation.
It must be assumed that safe operation is no longer possible:
- if the HALO II shows visible signs of damage, or
- the HALO II does not function, or
- after long periods of storage under adverse
environmental conditions.
5
HALO II
3.0
Operating Instructions
Description
The HALO II instrument is comprised of the following features:3.1
An open core current transformer sensing unit for
accurately measuring high voltage conductor 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 is large
enough to accept all conductor sizes up to 58mm in
diameter.
3.3
The housing has been designed in such a way as to
ensure the conductor always lies at the point from
which the HALO II is hung thus minimising errors due to
varying conductor position.
3.4
The output from the sensing circuit supplies inputs to
solid state circuitry housed in a high quality PVC grade
7 tube that conforms to BS3506.
3.5
Current readings between 0 and 2000 amps are
indicated on a 3.5” LCD display module.
3.6
A membrane type tactile response control panel allows
an operator to switch the HALO II On / Off and select
between Hold and Track modes.
3.7
Hold Mode allows the display to store the peak reading
of the R.M.S. current monitored in a conductor over any
given time.
3.8
Track Mode allows the display to continuously display
the measured current.
3.9
The HALO II power supply is generated from a
replaceable internal 9VDC battery.
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HALO II
4.0
Operating Instructions
Electrical Specifications
Display
Measurement
range
Accuracy
Operating
temperature
Maximum Voltage
Battery
3.5 digit LCD 10mm high characters
0 – 2000 Amps
± 3% ±1 digits
-18 ºC to +50 ºC (0 ºf to +122 ºf)
36 kV (Phase to Phase)
9VDC Alkaline MN1604 6LR61
5.0
Operation
5.1
Press and release the On / Off button on the HALO II
control panel. If a battery symbol appears on the LCD
display then the battery within the unit must be replaced
(see section 6).
5.2
Assemble the operating rods to the required height for
the overhead line conductor to be monitored before
attaching the HALO II to the end of the operating rods.
The HALO II is designed for direct attachment to
standard operating rods with splines.
The HALO II must not be used as a hook for general
engineering purposes. The load on the hook should
not exceed 10kg longitudinal or 5kg in any other
direction.
5.3
The operator can select Track mode by pressing and
releasing the Track / Hold button until the symbol is
indicated in the lower left corner of the LCD display.
Select Hold mode by pressing and releasing the Track /
Hold button again. The symbol
in the bottom left
corner of the LCD display now disappears.
˜
˜
5.4
The operator can reset a held current measurement on a
HALO II by pressing the Track / Hold button twice. This
re-selects the Hold mode ready for the next test.
5.5
Hoist the equipment up and hook the HALO II over the
conductor to be monitored. The HALO II should be kept
7
HALO II
Operating Instructions
in place for a minimum of 30 seconds to enable an
accurate reading to be recorded.
Using a new battery the HALO II can monitor a
conductor current for approximately 30 hours
before the battery needs replacing.
5.6
For best results the hook of the HALO II should be
positioned such that it faces away from any other
energised line conductor.
5.7
On completion of the monitoring period the operator
should unhook the HALO II from the line conductor and
carefully lower the equipment to view the current
reading on the LCD display.
If the battery symbol is visible on the LCD display
then the current reading must be assumed to be
incorrect since the battery requires replacing.
5.8
Once testing is complete press the On / Off button to
switch the HALO II off.
The HALO II is internally screened to guard against
the affect of electrostatic fields. However it is
recommended that the use of the HALO II within
high density electromagnetic or electrostatic fields
be avoided.
6.0
Battery Installation and Replacement
A battery symbol on the LCD display of the HALO II
denotes that the battery requires charging.
6.1
Access to the battery compartment in a HALO II is by
removing the two screws at the end of the tube that
fasten the spline adaptor to the tube.
6.2
With the two screws removed slide the spline adaptor
out of the tube. The adaptor has a machined recess that
holds the battery in position.
6.3
Disconnect the battery contact and remove the flat
battery. Attach a new battery to the battery contact.
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HALO II
Operating Instructions
Insert the battery into the recess and slide the spline
adaptor back into the tube.
6.4
Line up the holes in the tube with the screw threads in
the spline adaptor and insert screws and fasten.
7.0
Maintenance
7.1
The HALO II is extremely robust but should always be
kept free from dust and any excessive temperature
variations avoided.
7.2
Ensure the HALO II is kept dry with no surface moisture
on either the body or the housing of the LCD display.
7.3
The body of the HALO II should be regularly inspected
to ensure no deep scratches or physical damage.
7.4
If any of the above conditions have been observed then
the HALO II must be appropriately secured to prevent
any further use.
8.0
Cleaning
8.1
Clean the external case of the HALO II with a clean dry
cloth.
8.2
Avoid using solvents and abrasive scouring agents to
clean the external case of the HALO II.
8.3
Check the battery contacts and mounting compartment
within the HALO II are free of electrolytic contamination.
8.4
Any contamination of the battery contacts
compartment should be cleaned with a dry cloth.
9
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