Page 35 - ECLECTIC MARCH-2022 INSIDE PAGES_p2.indd
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Ts were installed at both ends in R ph. Cable length Figure 8: Typical SCG (Smart Cable Guard) Set up
was around 5580m. Individual PD pulses were analyzed
and by using TDR (Time Domain Reflectometry) method By using two-time synchronized sensors Smart Cable
location was determined to be 30m approximately from Guard immediately pinpoints with an accuracy of 1% of
Majerhat SS end. the cable length the location of the PD activity.
This location was also confirmed from remote end Online Cable PD measurement technology can be used
(Diamond City West GIS) by Transponder Unit. accurately up to 3.5kM length of PILC Cable and up to
Suspected joint was dissected and clear PD Marks were 8.0kM length of XLPE Cables.
observed. SIU Contains both a sensor to measure pulses from the
cable and injection device to inject small pulses into the
Figure 7: Severe Tracking marks observed in Cable cable. A sensor is placed around the cable or earth lead.
after dissection For safe installation the inductive sensors have a split core
that allow to be clamped around the earth lead without
ONLINE MEASUREMENT PHILOSOPHY them needing to be disconnected.CU is a small dedicated
computer that is connected with the SIU by an optical
ComparedtoofflinePDMeasurement,onlinePDmonitoring fibre eliminating possible electromagnetic interference
ensures measurement of irregular partial discharge activity which could easily occur in the environments where
which varies with time. Online PD monitoring system these units are used.
safeguards medium-voltage underground cable network The CU controls the measurement sequence, data
by pinpointing weak spots & faults. collection, signal processing and data communication
Each system comprises of two Sensor Injector Units (SIU) with the server. Moreover, the CU also has communication
and two Control Units (CU), placed at each cable end. A facilities on board (LAN or Mobile phone card) Centralized
cable end is a cable termination or sealing end, as can be control and surveillance measured data is uploaded via
found in a ring main unit, in a substation or at outdoor., internet to the server for centralized surveillance.
for instance connecting the cable to an overhead line.
The SIU measures the pulses coming from PDs or faults. It Figure 9: Field Trial of Continuous Cable PD Monitoring at
also injects small pulses for time synchronization. The CU Bot SS - Bellilious Park GIS Circuit
handles the measured data and send it via the internet
to the Central Server. When a fault occurs, the grid
operator receives an email notification within 5 minutes.
In addition, status updates are made available to the
operator every hour showing any PD activity.
35
was around 5580m. Individual PD pulses were analyzed
and by using TDR (Time Domain Reflectometry) method By using two-time synchronized sensors Smart Cable
location was determined to be 30m approximately from Guard immediately pinpoints with an accuracy of 1% of
Majerhat SS end. the cable length the location of the PD activity.
This location was also confirmed from remote end Online Cable PD measurement technology can be used
(Diamond City West GIS) by Transponder Unit. accurately up to 3.5kM length of PILC Cable and up to
Suspected joint was dissected and clear PD Marks were 8.0kM length of XLPE Cables.
observed. SIU Contains both a sensor to measure pulses from the
cable and injection device to inject small pulses into the
Figure 7: Severe Tracking marks observed in Cable cable. A sensor is placed around the cable or earth lead.
after dissection For safe installation the inductive sensors have a split core
that allow to be clamped around the earth lead without
ONLINE MEASUREMENT PHILOSOPHY them needing to be disconnected.CU is a small dedicated
computer that is connected with the SIU by an optical
ComparedtoofflinePDMeasurement,onlinePDmonitoring fibre eliminating possible electromagnetic interference
ensures measurement of irregular partial discharge activity which could easily occur in the environments where
which varies with time. Online PD monitoring system these units are used.
safeguards medium-voltage underground cable network The CU controls the measurement sequence, data
by pinpointing weak spots & faults. collection, signal processing and data communication
Each system comprises of two Sensor Injector Units (SIU) with the server. Moreover, the CU also has communication
and two Control Units (CU), placed at each cable end. A facilities on board (LAN or Mobile phone card) Centralized
cable end is a cable termination or sealing end, as can be control and surveillance measured data is uploaded via
found in a ring main unit, in a substation or at outdoor., internet to the server for centralized surveillance.
for instance connecting the cable to an overhead line.
The SIU measures the pulses coming from PDs or faults. It Figure 9: Field Trial of Continuous Cable PD Monitoring at
also injects small pulses for time synchronization. The CU Bot SS - Bellilious Park GIS Circuit
handles the measured data and send it via the internet
to the Central Server. When a fault occurs, the grid
operator receives an email notification within 5 minutes.
In addition, status updates are made available to the
operator every hour showing any PD activity.
35
