4-Phase Asset Management 

We work closely with our customers to provide tailored and cost effective On-line Partial Discharge (OLPD) test and monitoring programmes across complete MV and HV networks. Our technology is used to support our clients to make condition-based asset management decisions.
 
4-Phase Landscape

Background

HVPD's integrated, 4-Phase Asset Management solution combines a complete range of OLPD spot test and monitoring technology. The solution provides the framework for a systematic and cost effective, condition-based asset management system for MV and HV networks which identifies, locates, monitors and manages OLPD activity within the customer's network through four phases.
 
OLPD testing of in-service cables and plant has now become widely accepted as the most effective means for the assessment of the insulation health of MV and HV cables and plant. OLPD testing and monitoring can be used as a tool for predictive maintenance by providing an early warning of insulation faults.
 
The application of a combination of both on-line and off-line partial discharge testing and OLPD monitoring systems for in-service plant can produce risk-of-failure indices to support condition-based asset management decisions. By replacing or repairing cables or plant that has high levels of OLPD activity, the MV/HV plant owner can target their maintenance budgets to those assets in most need whilst simultaneously reducing the risk of an MV/HV insulation fault on their network. Only between 5 and 20% of assets in the MV/HV network will have significant levels of OLPD activity. The key to any asset management approach is to ensure that any test and monitoring resources, and ultimately maintenance activities, are directed to the most critical percentage of the network.
 
With the advent of recent developments in wideband OLPD monitoring, such as with the HVPD Complete HV Network Monitoring Solution, the entire installed HV network, including switchgear, cables and remotely connected HV plant can be assessed under normal working conditions, without the need for an outage. Real-time condition monitoring (CM) such as this, combined with a proactive, preventative maintenance intervention strategy can help reduce the risk of unplanned outages caused by HV insulation failure.

Economics for HV Networks

Oil platforms, industrial processes, nuclear facilities, data centres and other high profile or sensitive power supplies can have a very large cost of interruption, with an average outage being $220,000 per hour in the oil and gas industry rising to $474,000 per hour in the data centres . In such industries, with local, high-value HV networks, it is easier to justify a positive cost-benefit ratio for the application of continuous, 24/7 OLPD monitoring technology as the cost of the OLPD monitoring system pays back immediately when a single critical failure is prevented.
 
 
 
 
 
 

4-Phase Asset Management

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Refers to a quick, look-see scan of the plant to identify any partial discharge using the PDS Insight™ and PDS Insight™ Machines. These are simple to use handheld test units suitable for rapid preliminary scanning of a large population of assets with a test time of ten seconds per asset. PDS Insight™ testing is typically performed in the switchroom where personnel can test an entire switchboard for PD quickly and easily using transient earth voltage (TEV) sensors and ultrasonic/airborne acoustic probes. The PDS Insight™ Machines can be additionally used for testing rotating machines using pre-installed high voltage coupling capacitors (HVCC). Both of these handheld test units provide data for the OLPD Manager™ app for trending.
 
 
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The diagnostic phase typically involves a 4 channel test unit, the HVPD Longshot™, with synchronous data acquisition on 4 or more channels. This type of technology allows more detailed testing to be undertaken where OLPD data is collected from all three phases at once (to within 10 ns on all channels on advanced test units). This enables discharge type, phase-to-phase or phase-to-earth, to be ascertained. Typical diagnostic spot test times range from around ten minutes to one hour per asset with detailed data analysis and reports often required upon completion of the tests. If OLPD activity is detected, then the diagnostic testing is extended to locate the source of the PD site(s) within the circuit under test. In the case of HV cables, OLPD cable mapping is carried out to locate the source(s) of PD activity along the cable circuit.
 
 
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An alternative solution for the permanent continuous OLPD monitoring (Phase 4) is to install permanent HFCT or HVCC sensors and perform periodic continuous OLPD monitoring with HVPD Kronos® Portable unit. This solution provides most of the advantages of the permanent OLPD continuous monitoring when a lower budget is available whilst allowing for multiple substations to be monitored sequentially, typically for 1 month a time.
 
 
 
  
4-Phase_Header_Icon_P4_crop.pngThe HVPD Kronos® Permanent Monitor provides continuous OLPD monitoring technology providing an early warning against HV insulation failure through developing insulation faults. Continuous OLPD monitoring systems detect operational and environmental variations in PD activity and provide the best warning against HV insulation failure. This early warning needs to provide sufficient time to schedule a planned, preventative maintenance intervention at minimum cost and maximum convenience for the operator, whilst avoiding what can be a very costly, unplanned outage. The condition benchmarking of OLPD data also plays a critical factor in effective condition-based maintenance, whereby the condition monitoring data obtained from the HV asset under test is uploaded to the HVPD OLPD Measurements Database© where it can be compared with similar types of plant to identify the worst-performing circuits.