IEC 62478 IEC 62478 A Prospective Standard for A Prospective Standard for Acoustic and Electromagnetic Acoustic and Electromagnetic Partial Discharge Measurements Partial Discharge Measurements Michael Muhr Michael Muhr Univ.-Prof. Dipl.-Ing. Dr.techn. Dr.h.c. Univ.-Prof. Dipl.-Ing. Dr.techn. Dr.h.c. Institute of High Voltage Engineering and System Institute of High Voltage Engineering and System Management Management University of Technology Graz University of Technology Graz
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IEC 62478 A Prospective Standard for Acoustic and Electromagnetic Partial Discharge Measurements Michael Muhr Univ.-Prof. Dipl.-Ing. Dr.techn. Dr.h.c.
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IEC 62478IEC 62478
A Prospective Standard forA Prospective Standard forAcoustic and ElectromagneticAcoustic and Electromagnetic
Michael MuhrMichael Muhr Univ.-Prof. Dipl.-Ing. Dr.techn. Dr.h.c.Univ.-Prof. Dipl.-Ing. Dr.techn. Dr.h.c.
Institute of High Voltage Engineering and System Management Institute of High Voltage Engineering and System Management University of Technology GrazUniversity of Technology Graz
performance check: functional check of the whole measuring path including sensor and PD acquisition systemsensitivity check: emission of electromagnetic waves into test objects, distance
• HF / VHF Aspectsperformance check: sensor to sensor coupling in a specific arrangementsensitivity check: injection of field signal to test object, distance
• Acoustic Aspectsperformance and sensitivity check: recommendation of acoustic standards
M. Muhr
IEC 62478
IEC TC42 WG 14IEC TC42 WG 14
Content 6
- pC Correlation• HF / VHF / UHF – pulse generator injection to determine relation
between pC and measured quantities• Acoustic: can not compared to pC without knowing the type of PD
source
- New quantities• parameters linear with sensor output [mV]• parameters quadratic with sensor output [mW]• effective height [mm] – ratio between sensor output and incoming
electrical field• Effective aperture [mm2] – ratio between maximum sensor output
power and power density of incoming electrical field• sensor gain [dBi] – ratio between receiving power antenna and
receiving power of isotropic radiator
M. Muhr
IEC 62478
IEC TC42 WG 14IEC TC42 WG 14
Content 7
EM – PD SourceBasic Quantity E [Volt / meter]
Sensor – AntennaBasic Quantity e.g.
[meter]
ReadingQuantity
[Volt]
PD [pC]
Quantity [m Watt]
Low Standard DeviationDefinition of Transfer Characteristic
Definition of TransferCharacteristic
Low Standard Deviation
System Check
Physical Generic Aspect
MathematicalTerm
Quantity [Volt]PD [pC]High Standard Deviation
M. Muhr
IEC 62478
IEC TC42 WG 14IEC TC42 WG 14
Content 8
Non Standardization
- Applicable sensor
- Test and measuring configurations
- Interpretation – task of the component panels
M. Muhr
IEC 62478
Thank You for Your Attention Thank You for Your Attention