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The authors present a novel on-line partial discharge (OLPD) high voltage (HV) insulation condition monitoring (CM) solution for complete HV network monitoring of petrochemical refining facilities. Continuous, (24/7) OLPD insulation monitoring of the HV insulation condition of cables, switchgear, transformers and rotating machines (operating at 3000 V and above) provides operators with an early warning...
The majority of the larger (> 7.5 MW) high voltage (> 3.3 kV) motors in the oil and gas industry are operated through variable speed drives (VSDs). In order to maintain the availability of these critical machines, on-line condition monitoring (CM) technology is required. This paper describes a novel solution for reliable, on-line partial discharge (OLPD) CM of the HV stator winding insulation...
A new holistic technique for the combined electrical and mechanical condition monitoring (CM) of high voltage (HV) rotating machines has been developed. It is mainly aimed at the oil and gas sector where machine failure can potentially have catastrophic consequences as well as a huge financial cost. The technique combines partial discharge (PD) monitoring, motor current signature analysis (MCSA),...
The authors describe a new approach to on-line partial discharge (OLPD) insulation condition monitoring (CM) of complete high voltage (HV) networks (voltage range: 3.3 kV to 132 kV) in the oil & gas industry. The technique described is suitable for the condition monitoring of HV generators, switchgear, cables, motors and transformers. Comprehensive HV network OLPD condition monitoring coverage...
This paper presents results from the continued application of a new technique for the remote, on-line partial discharge (OLPD) testing and monitoring of in-service, high voltage (HV) Ex/Atex motors operating in hazardous gas zones. The technique employs high current, wideband, high frequency current transformer (HFCT) sensors located remotely from the motor under test, at the switchboard end of the...
This paper considers the measurement and propagation of partial discharge pulses on distribution class power cable circuits, with the idea of attempting to determine discharge location sites on cables based on the parameters of individual pulses. Single-ended discharge location techniques based on partial discharge pulse parameters and shape will not be as accurate as time-domain reflectometry methods...
The authors present a paper detailing their experiences (over the past 5 years) in the insulation condition monitoring of land-sea export cables and subsea array and platform interconnection cables in the UK offshore renewables and oil & gas industries. The paper focusses on the use of partial discharge (PD) testing to detect and locate pre-fault PD activity and also the use of time domain reflectometery...
The technique of controlling neutral voltage and current is applied in medium- and high-voltage electricity networks as a means of eliminating earth fault currents. The complete compensation of earth fault currents is achieved using modern power electronics developed by Swedish Neutral. The GFN Ground Fault Neutralizer uses beside traditional Petersen Coil technology a novel Residual Current Compensator...
On-line Partial Discharge (PD) testing of rotating machines has traditionally been carried out using pre-installed High Voltage Coupling Capacitor (HVCC) sensors connected at the terminal box of the machine. These provide high impedance to low frequency signals (< 10MHz) and low impedance to the high frequency PD pulses (> 10MHz). The use of these sensors allows PD measurements to assess the...
The authors present a paper on the application of a new technique for the remote on-line partial discharge monitoring of the stator insulation condition of in-service, high-voltage rotating machines. The technique applies wideband, ferrite-based high frequency current transformer sensors and high resolution measurement technology. This remote partial discharge monitoring technique has significant...
Carrying out the on-line partial discharge (OLPD) testing of in-service high voltage (HV) rotating machines can be an effective technique to understand any insulation degradation mechanisms that may be present within the stator windings. Interpretation of OLPD measurements performed on rotating machines can be difficult due to the presence of noise and interference from variable speed drives (VSD's)...
The authors present a paper on the application of online partial discharge (PD) testing and monitoring technology for the insulation condition assessment of in service medium voltage (MV — 3.3kV to 45kV)) and high voltage (HV — 66kV to 750kV) cables and plant. The paper begins with a short summary of the different economic ‘DRIVERS’ which apply to both public utility and industrial HV networks. The...
This paper discusses the general application of using Neural Networks (NN) to classify six different types of Partial Discharge (PD). Stator winding failures contribute about 30–40% of the total motor failures according to IEEE and EPRI. Ninety percent (90%) of electrical failures on High-Voltage (HV) equipment are related to insulation deterioration. Large datasets were collected for motors with...
This paper describes the development and deployment of new portable on-line partial discharge (PD) monitoring devices for the condition monitoring of medium voltage (MV) cables and switchgear. In order to provide a complete MV network monitoring solution, devices for monitoring of PD at both primary and secondary substations are necessary. The authors describe the technologies and methodologies which...
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