HIGHVOLT Calibration Laboratory DKD-K-24501 Traceable ...

HIGHVOLT Calibration Laboratory DKD-K-24501
Traceable Calibrations and Calibration Service for
HV Measuring Systems
10.30/2

General Principles and
Requirements for
Calibrations
The user of measuring technique, also in
high voltage applications, is confronted with the demand
of technical and quality assurance standards (as the
ISO 9000 series, IEC 60060-2; 1994, IEEE Standard
4.1995) to work with measuring systems calibrated
traceable to National Standards.
The term traceability means a process
whereby the indication of a measuring system (MS) or
instrument (I) can be compared, in one ore more
stages, with a National Standard for the measurand in
question. In each of these stages a calibration has been
performed using a standard with a metrological quality
already determined by calibration with a higher level
standard. The related calibration hierarchy, is shown in
figure 1.
The HV test department of a company must
work with a MS of which at least the first calibration was
proceeded by an accredited calibration laboratory. If a
company operates a high number of MS, the periodical
recalibration may be solved by an in-house calibration
section which has the necessary Reference Measuring
System (RMS, Working Standard) calibrated by a
National Metrology Institute or an Accredited
Laboratory, suitable experienced personal and written
calibration instructions.
Calibration hierarchy
Na-
tio
-nal
Stan-
dard
Reference
Standard
Reference
Measuring System
(working standard,
factory standard)
Measuring system
of test equipment
Figure 1: Calibration hierarchy
National
Metrology
Institute
Accredited
Calibration
Laboratory
In house
Calibrationl
Laboratory
HV test field
of the
company
Task
To maintain and to
disseminate the
National Standards
To safeguard the
metrological
infrastructure of a
country
Supervision of
measuring
equipment for inhouse
purposes
Measurements and
tests as part of
quality assurance
measures
Accredited calibration laboratories are
established to safeguard the metrological infrastructure
of a country. They realize most of the routine calibration
work for HV departments of companies and in-house
calibration sections. They operate industrially
manufactured Reference Standards with the best
possible characteristic.
The described calibration hierarchy is
completely established in Germany where
PTB The Physikalisch-Technische Bundesanstalt in
Braunschweig is the German National
Metrological Institute and has the responsibility
for the National Standards of measurement by
law.
DKD In the German Calibration Service (Deutscher
Kalibrierdienst) calibration laboratories of the
industry and other institutions are jointed. They
are accredited and supervised by the
accreditation body of the German Calibration
Service (DKD) at the PTB according to fixed
criterions, as e.g. the HIGHVOLT Calibration
Laboratory.
The DKD-laboratories issue DKD-
Calibration Certificates with a fixed structure. A DKD-
Calibration Certificate contains detailed information
about the calibration object, the calibration procedure,
measuring conditions, measuring results und
uncertainty of measurement. The DKD-Certificate may
contain a conformity declaration concerning IEC 60060-
2 if the conformity was proved by measurements. The
certificates are valid for the moment and for the
conditions of the calibration. The user is obliged to have
the object recalibrated at appropriate intervals.
The German Calibration Service is a
signatory to the multilateral agreement of the “European
Co-Operation for Accreditation” (EA) for the mutual
recognition of calibration certificates.
Basis for the
calibration or
measurement
Statutory duty to
represent SI units and
ensure international
compatibility
Calibration Certificate
from National Metrology
Institute or an
accredited laboratory
Calibration Certificate
from National Metrology
Institute or an
accredited laboratory
Calibration certificate
from accredited
laboratory or factory
calibration certificate,
calibration mark
Documentation for
the calibration or
measurement
Calibration
certificate for
reference
standard
Calibration certificate
for working standard
or factory standard
Factory calibration
certificate, calibration
mark or the like
for test equipment
Test mark or the
like

Characteristics of the
HIGHVOLT Calibration
Laboratory DKD-K-24501
Table 1 shows the ranges and uncertainties of
measurement published by DKD after accreditation of
the laboratory. You also can find this table in
http://www.dkd.info/en/_laboratorien.htm .
Meas.
quantity
Range Conditions
Uncertainty
Comments
DC 1 V up to 1000 V 0.05 % MI 1)
5 kV up to 300 kV acc. to IEC
60060
0.4 % MS, divider 3)
AC 1 V up to 700 V 50 Hz 0.05 % MI 1)
Û√2, Ueff 100 V 10 Hz up to 500
Hz
0.05 % MI 1)
Û√2, Ueff 5 kV up to 125 kV 50 Hz 0.4 % MS, divider 1)
Û√2 5 kV up to 100 kV 30Hz up to
300Hz
0.4 % MS, divider 3)
Û√2, Ueff 10 kV up to 200kV 50 Hz 0.45 % MS, divider 3)
Û√2, Ueff
Impulse
voltage
peak value
100 kV up to 800
kV
50 Hz 0.8 % MS, divider 1)
acc. to
IEC 61083 /
DIN EN 61083
LI 50 V up to 1000 V 0.75 % MI
LIC 50 V up to 750 V Last: 0.95 % MI
SI 50 V up to 1000 V ≥ 1 M Ω, ≤ 50 pF 0.75 % MI
Time
parameters
LI T1
T2
0.84 µs
60 µs
coaxial cable:
length 1.5 m 3 %
3 %
LIC TC 0,5 µs up to 6 µs 3 % MI
SI TP
T2
Impulse
voltage
peak value
250 µs
2500 µs
LI 180 kV up to 200 kV
50 kV up to 700 kV
acc. to
IEC 60060 /
DIN EN 60060
3 %
3 %
5)
5)
0.45 %
0.7 %
MI
MI
MS, divider
MS, divider 2), 3), 4)
LIC 180 kV up to 200 kV 0.8 % MS, divider
SI 180 kV up to 200 kV
50 kV up to 500 kV
Time
parameters
0.45 %
0.8 %
MS, divider
LI T1 0.8 µs up to 1.6 µs
3 % MS, divider
T2 40 µs up to 60 µs
3 %
LIC TC 0.5 µs up to 6 µs 3 % MS, divider
SI TP
T2
200 µs up to 300 µs
1000µs up to 4000
µs
Capacitance 10 pF up to 100 pF up to 10 nF
10kV up to 800kV
50 Hz
3 %
3 %
0.1 %
0.05 %
0.5 %
Loss factor 1⋅10 -5 up to 1⋅10 -3 3⋅x 10 -5
Abbreviations and comments:
MS, divider
Capacitors 1)
LI: full lightning impulse voltage T1: front time T2: tail time
LIC chopped lightning impulse voltage TC: chopping time
SI switching impulse voltage T1: front time T2: tail time
MS measuring system MI measuring instrument
1) Calibrations only at the permanently stationed laboratory
2) Used ranged range of the digital recorder minimum 50 %
3) Calibrations at the permanently stationed calibration laboratory or on site.
The minimal reachable uncertainties of measurement in the case of on site
calibrations have to be increased by considering the contributions of the
voltage generators depending on their characteristics
4) The declared uncertainties are valid for smooth curves without oscillations
and without overshoot.
5) The declared uncertainties are valid for the means value of minimal 10
measurements.
Calibration service at the
HIGHVOLT Calibration
Laboratory DKD-K-24501
On the basis of these ranges and the demand
of IEC 60060-2 that MS have to be calibrated at least at
20 % of the maximum voltage applied for quality
relevant tests HIGHVOLT supplies the calibration
service for
Measuring Systems
and Dividers up to
� 1500 kV DC
� 1000 kV AC
(on-site)
� 3000 kV AC
(in our
laboratory)
� 3500 kV LI
� 2500 kV SI
and additionally
� Peak voltmeters
� Standard
Capacitors
We perform calibrations in our laboratory in Dresden,
Germany, where we have own voltage generators for
1000 kV AC, 600 kV DC and 800 kV LI/SI, or at the test
laboratory of customers (on-site calibration). Our
equipment is prepared for an on-site calibration service
in Middle Europe.
Of course, all new HIGHVOLT Measuring
Systems may get a DKD-calibration on request of the
customer.
The use of the service of DKD-K-24501 has
the following advantages for the users of HV test
equipment:
� Competent advice concerning all questions of
service and calibration by our highly qualified and
very experienced staff
� Independent consideration of each calibration
procedure
� Independent consulting in all question concerning
calibration technique and procedures
� Time and cost effective on-site procedures without
risk for the calibration object
� Clear demonstration of the traceability of the
measurement – long discussions with assessors of
accreditation bodies can be avoided
� Optimal relation between prices and performance

How to get a calibration
Calibration possibilities
Customer
Calibration enquiry
Calibration offer
Calibration order, confirmed program
Data input into the register
Preparation of the equipment
Transportation
Regulation of the form of the calibration voltage
Figure 3: Procedure of a calibration
Enquiry
A qualified enquiry should be the basis for the choice of
the equipment and estimation of the content of
calibration. The leaflet No. 10.31 including
questionnaire added may be helpful to fix the calibration
task.
Calibration offer
After the check of the task under consideration of the
possibilities of the laboratory and the content of
accreditation the customer gets a calibration offer
containing the program of the calibration and all
necessary technical and commercial conditions. In the
case of technically unclear situations the task first will
be discussed with the customer.
For further information please contact:
HIGHVOLT Prüftechnik Dresden GmbH
Calibration Laboratory DKD-K-24501
Marie-Curie-Strasse 10
D-01139 Dresden/ Germany
Telephone : ++49 351 8425 668
Fax : ++49 351 8425 610
e-mail : maucksch@highvolt.de
web-site: www.highvolt.de
Discussion
Confirmation
Arrangement of the measuring circuits
Preparation of the measuring instruments and the computer
Control of the form of the calibration voltage
Proceeding of the measurements
Print of the measuring protocols
Transportation back to HIGHVOLT
Evaluation of the results, estimation of the uncertainty of measurement
Customer
Internal calibration
Calibration certificate
Storage of the measuring data, protocols and certificates
On-site calibrations
In the case of on-site calibrations the customer has to
ensure that the measurements can be proceeded
under sufficient conditions. The following points should
be considered:
• The laboratory should be prepared for the
arrangement of the standards. The necessary
clearances for the standards (given in the offer)
have to be fulfilled.
• The environmental conditions as temperature and
humidity should be inside a range for which the
metrological behaviour of the standard is known
(e.g. temperature +5°C up to 35°C, humidity
between 30 % and 70 %).
• The voltage generators should be in full function
and they have to be operated by the staff of the
customer.
• The test voltage shape should fulfil the limits given
in IEC 60060-1.
or our local representative :

Questionnaire as basis for an calibration offer
Customer
Name of the company:
Address of the company:
Person in charge: Name: Phone:
Measuring System (Please, use one questionnaire for each system)
Kind of voltage:
Rated voltage:
Measuring quantities:
Measuring range:
Are there any measuring taps to be
calibrated?
Divider
Type:
Serial No.:
Rated voltage:
Type of the low voltage part:
Serial no of the low voltage part:
Scale factors:
Measuring instrument
Type:
Serial N.:
Measuring quantities:
Measuring ranges:
No
Fax :
Yes Number Rated voltages:
Measuring range:
Kind of desired calibration On-site At the stationary laboratory
Calibration of the measuring system
Divider calibration
Calibration of measuring instruments
Desired date
Date and sign of the person in charge
The offiiciiall DKD iinformatiion you can fiind iin the worlld wiide web under http://www.dkd.ptb.de/deutsch/kalliillab/pdf/24501.pdf
In case of questions and enquiries concerning calibration, please, contact:
HIGHVOLT Prüftechnik Dresden GmbH
Kalibrierlaborlabor
Marie-Curie-Str. 10
01139 Dresden
Phone: +49 351 8425 668
Fax: +49 351 8425 9668
e-mail: maucksch@highvolt.de