case studies - mv cables
TRANSCRIPT
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HFCT Clamp
SS1 SS2J1 J2
256 m
43m
= Measurement Point
200m
1x3-core 3x1-core3x1-core
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0
100
200
300
400
500
600
4 8 12
Fasi
AmpiezzamassimaPD[mV]
Prima sessione
Seconda sessione
Terza sessione
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L1 L2 L3 L4 L5 L6 L7 L8 L9 L10 L11 L12 L13 L14 L15
PUMP A,B,C
MOTOR A,B
BOILER
PUMP
MOTOR
PUMP D,E
SOLVENT PUMP
A,B,C
PUMP F,G,H
COMPRESSOR
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PM SW25ft
PM TX
PM TX
BL28
20ft
PM TX
BL2901
BL29500ft
BL77
PM SW
BM35
PM SW
CN16
PM SW CO34
PM SW CO65
PM SW
DO39
POLEPM SW
EA10
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PM SW
25ft
PM TX
PM TX
BL28
20ft
PM TX
BL2901
BL29500ft
BL77
PM SW
BM35
PM SW
CN16
PM SW CO34
PM SW CO65
PM SW
DO39
POLEPM SW
EA10
Noise
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Detection point Amplitude
BL2901 BL29 12 mV
BL2901 BM35 29 mV
BM35 BL2901 45 mV
BM35 CN16 58 mV
CN16BM35 148 mV
CN16 CO34 125 mV
CO34 CN16 74 mV
CO34 CO65 78 mV
DO39 CO65 78 mV
DO39 EA10 41 mV
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PM SW
25ft
PM TX
PM TX
BL28
20ft
PM TX
BL2901
BL29500ft
BL77
PM SW
BM35
PM SW
CN16
PM SW CO34
PM SW CO65
PM SW
DO39
POLEPM SW
EA10
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Branches
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Fibre Optic
Link
Circuit under test
PD
Sensors
Sync
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Power
cable
HFCT Clamp
LFCT
To PDBaseII
PD channel
To PDBaseII
Sync. channel
Ground
connection
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Internal PD (blue cluster)
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Power
cable
HFCT Clamp
LFCT
To PDBaseII
PD channel
To PDBaseII
Sync. channel
Ground
connection
Capacitive
Divider
To SynchChannel
VLF
Generator
Cable
To PD channel
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+
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Phase 4
Qmax 95%=11 mV
Nw=3,8Qmax 95%=12mV
Nw=1
Qmax 95%=5mV
Nw=1,5
Phase 8
Qmax 95%=13mV
Nw=1,2
Qmax 95%=73mV
Nw=3
Phase 12
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0
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30
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50
60
70
80
I SESSION II SESSION III SESSION
MAXAmplitude
(mV)
Phase 4
Phase 8
Phase 12
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Qmax 95%=26mV
Nw=3
Qmax 95%=140mV
Nw=8
Qmax 95%=55mV
Nw=19
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First peak
Second peak
Third peak = 2L
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k=F0/F
eq F
0-XLPE= 9MHz F
eq= (F
eq max+F
eq min)/2 =(6+1)/2=3.5 MHz
k=2.57 ; A=100mV Aeff= A*k=257 mV
Aeff is the effective amplitude to be used for the diagnosis !
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Phase 4
Phase 8
Phase 12
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Qmax 95%=200mV
Nw=9
Qmax 95%=50mV
Nw=46
Qmax 95%=64mV
Nw=60
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1
10
100
1000
10000
I Session II Session III Session
Maxamplitude[mV
]
Amplitude
NW
A*NW
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First peak
Second peak
Third peak = 2L
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PD activity in MV cable systemscan be correctly detected, identifiedand located ON LINE
The ON LINE testing session does notrequire any outage of the asset and canbe very cost effective