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n there are multiple faults in the same location, Criticality assessment of the PD sources
their corresponding patterns are superimposed in the Identified
measuring point and can easily create confusion with
each other. Thus, it will be difficult to identify every The PD diagnosis using this Technology is performed
defect as sometimes the operator’s experience may be analyzing separately the partial discharge sets generated
insufficient to make a correct diagnosis. In addition, if by every PD source. This analysis can be done with the
the ambient noises are not eliminated, the identification help of powerful discrimination and PD identification
of different sources of partial discharges through tools. The conclusions of the PD Diagnostics with this
the simple observation of their patterns becomes Technology feature a photo in detail of the current state
challenging. of the system insulation, indicating which of the elements
show some kind of failure in its insulation.
This Technology overcomes this inconvenience by
eliminating the background noise prior to analyzing the To perform the reception of an installation or the periodic
PD Patterns. maintenance by a PD diagnosis in a timely manner allows
to detect the partial discharge sources in the insulation.
To achieve the separation of more than one PD source The Technology provides characteristic indicators of each
located in a single position, Spot Measurement detected PD source to assess its criticality, phase resolved
Technology characterizes the shape of each partial pattern, PD pulse amplitude, PD rate per period, type of
discharge source with three parameters: two defect and location.
parameters α and β are correlated with the asymmetry
of the pulse envelope and other parameter ω is Continuous monitoring of a facility allows to detect the
correlated with the frequency of the PD pulse. These existence of PD sources from the first moment of its
three parameters allow a 3D representation. A PD activity. Analysis of the indicators of the amplitude and PD
cloud is associated with each generated PD source rate per period evolution provides information about the
whose phase resolved pattern corresponds to a insulation degradation speed. Additionally, continuous
different PD type generated (corona, internal defect, monitoring also ensures detection of the PD sources with
surface defect, etc.). intermittent activity due to the operating conditions of
the installation.
Figure 5: 3D Representation of a PD Source characterized Figure 6: Phase Resolved PD Pattern for Different types
with 3 parameters α, β & ω of PD Activities
Case Study on Cable PD Location by Spot
Measurement Using Precise PD
60dB TEV signal was detected from the Maj S/S RMU No.
2 – Diamond City West Leg cable.
Partial discharge location in cable was carried out by Spot
measurement technique using Precise PD equipment.
34
their corresponding patterns are superimposed in the Identified
measuring point and can easily create confusion with
each other. Thus, it will be difficult to identify every The PD diagnosis using this Technology is performed
defect as sometimes the operator’s experience may be analyzing separately the partial discharge sets generated
insufficient to make a correct diagnosis. In addition, if by every PD source. This analysis can be done with the
the ambient noises are not eliminated, the identification help of powerful discrimination and PD identification
of different sources of partial discharges through tools. The conclusions of the PD Diagnostics with this
the simple observation of their patterns becomes Technology feature a photo in detail of the current state
challenging. of the system insulation, indicating which of the elements
show some kind of failure in its insulation.
This Technology overcomes this inconvenience by
eliminating the background noise prior to analyzing the To perform the reception of an installation or the periodic
PD Patterns. maintenance by a PD diagnosis in a timely manner allows
to detect the partial discharge sources in the insulation.
To achieve the separation of more than one PD source The Technology provides characteristic indicators of each
located in a single position, Spot Measurement detected PD source to assess its criticality, phase resolved
Technology characterizes the shape of each partial pattern, PD pulse amplitude, PD rate per period, type of
discharge source with three parameters: two defect and location.
parameters α and β are correlated with the asymmetry
of the pulse envelope and other parameter ω is Continuous monitoring of a facility allows to detect the
correlated with the frequency of the PD pulse. These existence of PD sources from the first moment of its
three parameters allow a 3D representation. A PD activity. Analysis of the indicators of the amplitude and PD
cloud is associated with each generated PD source rate per period evolution provides information about the
whose phase resolved pattern corresponds to a insulation degradation speed. Additionally, continuous
different PD type generated (corona, internal defect, monitoring also ensures detection of the PD sources with
surface defect, etc.). intermittent activity due to the operating conditions of
the installation.
Figure 5: 3D Representation of a PD Source characterized Figure 6: Phase Resolved PD Pattern for Different types
with 3 parameters α, β & ω of PD Activities
Case Study on Cable PD Location by Spot
Measurement Using Precise PD
60dB TEV signal was detected from the Maj S/S RMU No.
2 – Diamond City West Leg cable.
Partial discharge location in cable was carried out by Spot
measurement technique using Precise PD equipment.
34
