THE V-LIM PROVIDES ACCURATE ELECTRICAL INTEGRITY DATA EVEN AT VERY LOW INSULATION RESISTANCE LEVELS

  The IR Problem

Insulation resistance monitoring is an industry accepted and recognised method of measuring the effects of water ingress into and around the umbilical electrical conductors. Electrical integrity monitoring is usually included on the topside facility at the input to the umbilical electrical conductors but these units are typically capable of accurately measuring high insulation resistance values only. Once insulation resistance has dropped below the measuring range the operator has effecticely lost any useful electrical conditioning monitoring.

The IR Pro   The Solution

The V-LIM can be readily integrated into topsides equipment either as part of a new development or retrofitted to existing installations. The V-LIM accurately monitors the insulation resistance, voltage, current and the loop resistance of the umbilical and subsea equipment with high accuracies. Insulation resistance is measured down to less than 1KOhm. The data gathered by the V-LIM can be used to analyse the rate of deterioration of the electrical insulation resistance in the system and further to estimate when the electrical insulation resistance is likely to result in system failure (electrical analysis required to determine system limits). The V-LIM data can also be interpreted to indicate if the failure has occured in the bulk insulation of the umbilical conductors.

  Key Benefits

• Protect subsea equipment from damage due to over-current.
• Increase uptime by coordinating equipment replacement with planned shutdowns.
• Optimise capital purchases based on predicted life of existing equipment.
• Avoid unplanned interventions by monitoring and trending electrical system integrity.

  Key Features

• Provides accurate insulation resistance measurements down to <1KOhm.
• Provides line current and line voltage measurements.
• Provides loop resistance measurement of connected load circuit  (load must be disconnected from supply).
• Data output to master control station and also stored in onboard data logger.
• Configurable alarms to protect subsea equipment from over-current.
• Control and re-configuration via master control station.
• Unit operating status displayed on front panel.
• Compatible with powerline signalling systems.
• Power isolation option on low IR limits (to ensure diver safety).
• Remote volt-free contacts for alarm anunciation.

Insulation resistance monitoring is an industry accepted and recognised method of measuring the effects of water ingress into and around the umbilical electrical conductors. Electrical integrity monitoring is usually included on the topside facility at the input to the umbilical electrical conductors but these units are typically capable of accurately measuring high insulation resistance values only. Once insulation resistance has dropped below the measuring range the operator has effectively lost any useful electrical conditioning monitoring.