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Partial Discharge Diagnostic of Medium Voltage Switchgear under Operating Conditions using a special PD- Probe. Quality Control Stages of MV GIS and PD - Measurement. demands high sensitivity ( ~ pC) failure identification failure location. development manufacturing - PowerPoint PPT Presentation
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Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
Partial Discharge Diagnostic of Medium Voltage Switchgear under
Operating Conditions using a special PD- Probe
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
Quality Control Stages of MV GIS and PD - Measurement
demands
high sensitivity ( ~ pC)
failure identification
failure location
pd
- m
eas
ure
me
nt
pd data base
(pc- based system)
development
manufacturing
assembling
transport/ on site assembling
operation
PRPD pattern
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
Phase- Resolved-PD- (PRPD) Pattern
measured parameter: q (U, φ, t, ….)
acc. to CIGRE- format)
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
PRPD- Pattern of a defect part
PD pattern of a separation between the insert and
the cast resin at the grounded side of a 36-kV-spacer
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
special problems for on- site- diagnosis demand for no- switching- off of operational voltage,
but compatibility to pd- test procedures during manu-
facturing process
measuring of PRPD- pattern for comparison with
reference pd- data- base seems to be necessary
calibrating procedures are necessary
(unconventional measuring methods like acoustical/
optical methods are not sufficient)
coupling elements are necessary
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
Typical measurement conditions for on- site- testing
pd- spectra with disturbancespd´s superimposed with large distur-
bances caused by near located SFC
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
special problems for on- site- diagnosis
requirement of high measuring sensitivity
special requirements/ procedures for suppressing
of noise/ disturbances
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
pd- on- site measurement by electromagnetic
field coupling
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
transfer characteristic of pd- probes (UHF- measurement)
[acc. to IEC 60270]
UHF- Measurement
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
transfer characteristic with and without pd- probe
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
diagnostic- object: medium voltage switchgear
h.v. joints
user- table
capacitive sensor
36kV GIS- substation modules
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
measuring sensitivity with capacitive sensor coupling
equivalent test circuit
q- sensitivity is non sufficient
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
medium voltage switchgear with additional cable- parts
h.v. joints
user- table
capacitive sensor
cable- parts
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
transfer characteristic with additional cable- parts
test circuit
transfer characteristic
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
pd calibration with and without connected power cable
0100200300400500600700800900
10001100
0 100 200 300 400 500 600 700 800 900 1000 1100
eingespeiste Ladung / pC
gem
esse
ne
Lad
un
g /
pC
without power cable
with power cable-classical pd- meas. system
-- pd- probe
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
diagnosis results
capacitive sensor
pd probe and measuring impedance
defect spacer
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
conclusions pd measurements are up to now an essen-
tial tool for quality testing of electrical
insulation even for on- site diagnosis
demanding for no- switching- off of
operation voltage during the testing leads
to non classical measurement methods
(UHF- measurement by special pd- probes)
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
if into the switchgear a capacitive sensor is available, so by using a special pd- probe sensitive PD- on site- tests can be provided
the measuring sensitivity can be increased significantly by using of appropriate resonance elements like cabel- parts
this testing arrangement can be used in principle even for similar configurations.
Prof. Dr.-Ing.habil. Rainer Haller Power & Environmental Engineering ZCU Pilsen/ Cz
Diagnostica ´07
Thank you --dekuji za pozornost
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