Voltage Sensing Switch
The Voltage Sensing Switch (VSS) is designed to prevent a short circuit, below the VSS tool, caused by power going to ground and preventing operation of a Owen Instrumentation Ballistics Delivery System. This would generally happen after a gun has been fired.
Documentation
The VSS is generally set up to allow any positive voltage (Owen Instrumentation Ballistics Delivery System tools operate on -82vdc) applied to its upper head to pass through while any negative voltage is blocked until it reaches -130vdc. If more than -130vdc is applied it will pass through the tool. If required it can be set up to block positive voltage and by pass negative.
Product features
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Is configurable to work with multiple detonators including:
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Igniters
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Standard 50 ohm resistorised dets
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Halliburton Red dets
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EBW/EFI dets such as PX1 and Secure
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Allows bypass of power for operation of tools and or guns below the VSS.
Product Application
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Perforating operations.
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Any operation where the application of negative power to the toolstring below would not be suitable.