Power - Surge and Lightning Protection |
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Surge and Lightning ProtectionElectro-magnetic-pulses (EMP) originate from lightning strikes (LEMP) or from nuclear explosions (NEMP). These fast rising electrical fields induce high voltage pulses in unprotected coaxial cables, antennas, data communication cables, or power cables from where they can be directly transmitted to the input of electronic equipment. Lightning protection is essential for permanent station implementation, and proper system grounding is essential for any lightning protection to work. UNAVCO provides a grounding terminal in its enclosure design that, when connected to an 8 foot grounding rod, provides protection for permanent station equipment. N-type Surge ArrestorUNAVCO recommends replacing standard bulkhead connectors for modems (radio or celluar) with protected connectors on all permanent station enclosures. This in-line lightning protection helps isolate the equipment in the enclosure by shunting power surges to ground. Proper system grounding is essential for this protection to work. UNAVCO has tested EMP protectors for use with GPS antenna cables to ensure data quality. See the Effects of LEMP Protection on GPS Signals test report for [dated] detailed information. The following table lists the items needed to replace a single bulkhead connector.
The following table shows the bulkhead connector specifications. To see an image enlarged, right-click and select ’View Image.’
Note: Mounted properly the surge arrester capsule will be up. Installation InstructionsGrounded Enclosure
Non-Grounded Enclosure
Serial Port ProtectorsUNAVCO recommends using surge protection for RS232 data connections to protect / isolate equipment from power fluctuations, spikes, induced transient and other surges, or nearby lightning strikes. The following table lists the recommended item needed to protect data connections.
Solar Array ProtectionUNAVCO recommends using low voltage-high current DC lightning arrestors to protect/isolate solar powered equipment from nearby lightning strikes. The following table lists the recommended item needed to protect solar powered equipment.
Phone Line / TelecommunicationsUNAVCO recommends using lightning sponges to protect/isolate telecommunication equipment from nearby lightning strikes. The following table lists the recommended item needed to protect telecommunications equipment.
AC Power Surge ProtectionUNAVCO uses the following Uninteruptable Power Supplies at Permanent GPS StationsBack UPS Pro 280 - United States International Back UPS Pro 280 Power Monitoring Software |
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Posted by: Beth Bartel - August 17, 2010. This article has been viewed 1091 times. | ||||||||||||||||||||||||||||||||||||||||||||||||||
Online URL: https://kb.unavco.org/article/power-surge-and-lightning-protection-462.html |
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