MGM/an/SC-7/Apr.’95
ESKOM SPECIFICATION
REFERENCE
REV
ESKSCAAD0
4
PAGE
1
OF 14
TITLE:
SPECIFICATION FOR CONTINOUS ANALOGUE
DATE: JUNE 1995
INDICATING INSTRUMENTS FOR ELECTRICAL
REVISION DATE:
QUANTITIES
JUNE 1998
------------------------------------------------------------------------------------------------------------------------COMPILED BY
FUNCTIONAL RESP.
AUTHORIZED BY
.........................
............................................
.............................
J Belgrove
T N Carolin
R Dabengwa
Measurement Stds WG
N M & C Man
ED (E)
----------------------------------------------------------------------------------------------------------------------This document has been seen and accepted by
B T Crookes
J A de Beer
P A Faling
Executive Director (Generation)
Executive Director (Technology)
Executive Director (Transmission)
CONTENTS
PAGE
1
Scope .................................................................................................
2
2
Normative references .........................................................................
2
3
Definitions ...........................................................................................
2
4
Requirements .....................................................................................
2
4.1
4.2
4.3
4.4
4.5
General ........................................................................................
Instruments ..................................................................................
Standard information ...................................................................
Drawings ......................................................................................
Instruction manuals ......................................................................
2
2
3
3
3
Tests ..................................................................................................
4
5
Annexes
A
Schedules A and B .............................................................................
5
B
Deviation schedule .............................................................................
12
C
Revision information ...........................................................................
13
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
2
OF 14
-------------------------------------------------------------------------------------------------------------------------
1 Scope
This specification details Eskom’s requirements for all a.c. and d.c. indicating instruments.
2 Normative references
The following documents shall be read in conjunction with this specification. However, in
cases of conflict, the provisions of this specification shall take precedence.
IEC 51-1: 1984, Direct acting indicating analogue electrical measuring-instruments and their
accessories. Part 1: Definitions and general requirements common to all parts.
IEC 51-2: 1984, Direct acting indication analogue electrical measuring-instruments and their
accessories. Part 2: special requirements for ammeters and voltmeters.
IEC 51-8: 1984, Direct acting indication analogue electrical measuring-instruments and their
accessories. Part 8: special requirements for accessories.
IEC 51-9: 1988, Direct acting indication analogue electrical measuring-instruments and their
accessories. Part 9: recommended tests methods.
DIN 43700, Measurement and control instruments for panel mounting.
DIN 43802-2: 1991, Line scales and pointers for indicating electrical measuring instruments;
general requirements.
DIN 43802-3: 1991, Line scales and pointers for indicting electrical measuring instruments;
designs and dimensions.
DIN 43802-4: 1991, Line scales and pointers for indication electrical measuring instruments;
scale graduation and numbering.
ESKASAAN7, Environmental requirements and tests for electronic measuring equipment.
3 Definitions
Not applicable
4 Requirements
4.1 General
4.1.1 Nothing in this specification shall lessen the contractor’s obligations detailed in any
other documents forming part of a contract.
4.2 Instruments
4.2.1 Indicating instruments are required for the continuous indication of electrical
quantities.
4.2.2 Indicating instruments will be mounted on various panels and mimic boards to be
supplied by Eskom.
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
3
OF 14
-------------------------------------------------------------------------------------------------------------------------
4.2.3 Instruments shall be contained in dustproof cases.
4.2.4 The glass front of the instrument shall be resistant to electrostatic build up.
4.2.5 Instruments shall be provided with an accessible zero adjustment screw where
applicable.
4.2.6 The instrument movement and its integral mounted dial shall be easily removable from
the instrument case for maintenance purposes.
4.2.7 The dial shall be firmly secured.
4.2.8 The step input response of the instruments shall be critically damped.
4.2.9 The calibration shall not be affected by stray magnetic fields.
4.2.10 Where blank dials are required, they shall be supplied with a matt-white finish.
4.2.11 If scaled dials are required, scaling shall be in accordance with DIN 43 802 for
coarse scales.
4.2.12 The instrument shall be checked, calibrated and, if required, scaled by the
Engineering Department of the Distributor concerned.
4.3 Standard information
The following information shall be imprinted, in standard IEC symbols but positioned as
specified in DIN 43 802, on all instrument scales:
—
—
—
—
—
type
mounting angle
accuracy class
test voltage
alternating current or direct current.
4.4 Drawings
Three copies of all manufacturer’s drawings shall be supplied. On approval, one complete
set of transparencies or microfilm of the drawings shall be supplied to Eskom.
4.5 Instruction manuals
Copies of spare parts lists and instruction manuals, in quanitities specified in schedule A, of
the enquiry document, in English giving sufficient calibrating details to enable Eskom staff to
maintain and check the instruments, shall be supplied before delivery of the equipment. One
additional set of the above shall be supplied with the equipment on delivery.
5 Tests
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
4
OF 14
-------------------------------------------------------------------------------------------------------------------------
5.1 The instruments shall be type tested in accordance with the specification relevant to that
instrument type.
5.2 The manufacturer shall, at his works, perform routine tests.
5.3 Three copies of certificates, detailing the results of all type tests, shall be provided by
the manufacturer prior to delivery of the equipment.
Annex A
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
5
OF 14
-------------------------------------------------------------------------------------------------------------------------
(informative)
Schedules A and B
The schedules A and B in this annex are included in this document for information only: they
are intended to be guides to purchasers, in the areas of format and Eskom’s specific
technical requirements, to help them to prepare schedules which are applicable to a
particular enquiry or tender.
Annex A
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
6
OF 14
-------------------------------------------------------------------------------------------------------------------------
(informative)
Schedule A: Eskom’s particular requirements
Schedule B: Guaranteees and technical particulars of equipment offered
ITEM
DESRIPTION
1
Direct and CT operated moving iron
ammeters
SCHEDULE A
1.1
Required for measuring
1.2
Manufacturer
—
1.3
Manufacturer’s type reference
—
1.4
Full scale deflection
specify
1.5
— 1,5 A
— 7,5 A
— other
Movement deflection
specify
1.6
— 90°/240° [60 % of rated value at half
scale]
Instrument zero
on the left
1.7
Deflection direction
1.8
Case size-square pattern
—
—
—
—
—
amperes at 50 Hz
clockwise
48 mm
72 mm
96 mm
144 mm
other
1.9
Accuracy class
1.10
Scales
1,5
— blank
— DIN 43 802 (coarse)
1.11
Suspension type
pivot & jewel taut
band
Annex A
(continued)
SCHEDULE B
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
7
OF 14
-------------------------------------------------------------------------------------------------------------------------
Schedule A: Eskom’s particular requirements
Schedule B: Guaranteees and technical particulars of equipment offered
ITEM
DESRIPTION
1.12
Mounting angle with respect to horizontal
SCHEDULE A
specify
— 90°
— 0°
— other
1.13
Terminal to case withstand voltage
2 kv for 1 minute
1.14
Burden to be less than
1 VA
1.15
Continuous maximum rating not less
than
2 x FSD
1.16
Short term overload
10 times rated
current
for
3
seconds
1.17
Special scaling requirements
specify
1.18
Instrument glass
2
— non-reflective
— other
Moving coil ammeters
2.1
Required for measuring
2.2
Manufacturer
—
2.3
Manufacturer’s type reference
—
2.4
Scale deflection
D.C. amperes
specify
— 0 mA to 1mA
— 1 mA to 0 mA to 1 mA
— other
Annex A
(continued)
Schedule A: Eskom’s particular requirements
SCHEDULE B
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
8
OF 14
-------------------------------------------------------------------------------------------------------------------------
Schedule B: Guaranteees and technical particulars of equipment offered
ITEM
2.5
DESRIPTION
Movement deflection
SCHEDULE A
SCHEDULE B
specify
— 90°
— 240°
2.6
Instrument zero
— on the left
— centre scale
2.7
Deflection direction for positive current
clockwise
2.8
Case size-square pattern
—
—
—
—
—
48 mm
72 mm
96 mm
144 mm
other
2.9
Accuracy class
1,5
2.10
Deflection
linear
2.11
Scales
— blank
— DIN 43 802 (coarse)
2.12
Suspension type
pivot & jewel taut
band
2.13
Mounting angle with respect to horizontal
specify
— 90°
— 0°
— other
2.14
Terminal to case withstand voltage.
2 kV for 1 minute
2.15
Continuous maximum rating not less
than
2 x FSD
2.16
Short term overload
10 x rated current
for 3 seconds
Annex A
(continued)
Schedule A: Eskom’s particular requirements
Schedule B: Guaranteees and technical particulars of equipment offered
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
9
OF 14
-------------------------------------------------------------------------------------------------------------------------
ITEM
DESRIPTION
2.17
Instrument internal resistance
2.18
Instrument glass
SCHEDULE A
SCHEDULE B
specify
— non-reflective
— other
3
Direct and VT operated moving iron
voltmeters
3.1
Required for indicating
volts at 50 Hz
3.2
Manufacturer
—
3.3
Manufacturer’s type reference
—
3.4
Full scale deflection
specify
3.5
— 150 volt
— other
Movement deflection angle
specify
— 90°/240° [60 % of rated value
at half scale]
3.6
Instrument zero
on the left
3.7
Deflection direction
clockwise
3.8
Case size-square pattern
—
—
—
—
—
48 mm
72 mm
96 mm
144 mm
other
3.9
Accuracy class
1,5
3.10
Scales
specify
— blank
— DIN 43 802 (coarse)
Annex A
(continued)
Schedule A: Eskom’s particular requirements
Schedule B: Guaranteees and technical particulars of equipment offered
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
10 OF 14
-------------------------------------------------------------------------------------------------------------------------
ITEM
DESRIPTION
SCHEDULE A
3.11
Suspension type
pivot & jewel taut
band
3.12
Mounting angle with respect to horizontal
specify
SCHEDULE B
— 90°
— 0°
— other
3.13
Terminal to case withstand voltage
0V to 500 V
2kV
Over 500 V
2 x rated voltage
+ 1000 V for 1
minute
3.14
Short term overload
2 x rated voltage
for 10 seconds
3.15
Burden to be less than
5 VA
3.16
Continuous maximum rating not less 1,2 x FSD
than
Instrument glass
3.17
— non-reflective
— other
4
Moving coil voltmeters
4.1
Required for measuring
4.2
Manufacturer
—
4.3
Manufacturer’s type reference
—
4.4
Basic movement ohms per volts
a.c./d.c. volts
specify
— 1 000 Ω
— other
Annex A
(continued)
Schedule A: Eskom’s particular requirements
Schedule B: Guaranteees and technical particulars of equipment offered
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
11 OF 14
-------------------------------------------------------------------------------------------------------------------------
ITEM
DESRIPTION
4.5
Nominal input
4.6
— 50 V
— 110 V
— 220 V
— other
Movement deflection
SCHEDULE A
SCHEDULE B
specify
— 90°
— 240°
4.7
Instrument zero
on the left
4.8
Deflection direction
clockwise
4.9
Case size-square pattern
—
—
—
—
—
48 mm
72 mm
96 mm
144 mm
other
4.10
Accuracy class
1,5
4.11
Scales
4.12
— blank
— DIN 43 802 (coarse)
Suspension type
4.13
Mounting angle with respect to horizontal
pivot & jewel taut
band
specify
— 90°
— 0°
— other
4.14
Terminal to case withstand voltage
0V to 500 V
Over 500 V
2 x rated voltage
+ 1000 V for 1
minute
Annex A
(concluded)
Schedule A: Eskom’s particular requirements
Schedule B: Guaranteees and technical particulars of equipment offered
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
12 OF 14
-------------------------------------------------------------------------------------------------------------------------
ITEM
4.15
DESRIPTION
SCHEDULE A
Instrument glass
— non-reflective
— other
4.16
Continuous maximum rating
1,2 x FSD
4.17
Short term overload
2 x rated voltage
for 10 seconds
Annex B
(informative)
DEVIATION SCHEDULE
SCHEDULE B
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
13 OF 14
------------------------------------------------------------------------------------------------------------------------1 Any deviations/modifications/alternatives offered to standard specification ESKSCAAD0
shall be listed below with reasons for the departures.
2 No deviations/modifications/alternatives offered to the specification will be recognized
unless on this schedule.
3 If no deviations/modifications/alternatives are offered, this schedule must be marked
N/A
SPECIFICATION/
SCHEDULE
PAGE NUMBER
SPECIFICATION/
SCHEDULE
CLAUSE
NUMBER
PROPOSED
DEVIATION/MODIFICATION/ALTERNATIVE
Annex C
Revision information
SPECIFICATION FOR CONTINUOUS ANALOGUE
INDICATING INSTRUMENTS FOR ELECTRICAL QUANTITIES
REFERENCE
REV
ESKSCAAD0
4
PAGE
14 OF 14
------------------------------------------------------------------------------------------------------------------------DATE
REV NO
NOTES
Mar.’87
4
Document NWS 1307 Rev 4 issued.
Apr.’95
4
NWS 1307 re-numbered and re-formatted in accordance
with the Eskom documentation system. No changes.
Revision remains Rev 4.