Cable Monitor

Online Cable Monitoring: Partial Discharge, Sheath Current, Temperature and Fault Location

Four monitoring systems that watch a cable while it stays in service. Between them they cover the three failure mechanisms that matter on high voltage cable — insulation degradation, sheath and grounding problems, and overheating at joints — plus continuous fault location so a trip is answered with a location instead of a search.

What is in this section

• Partial discharge monitoring — the HF-C-201 cable partial discharge monitoring system tracks discharge activity in cable insulation and joints continuously, so a rising trend is visible long before an outage test would find it.
• Sheath and grounding current — the HF-C-202 cable sheath grounding current monitoring system is specified for 35 kV, 110 kV and 220 kV and above cable lines, sampling every 1 ms so transient waveform detail survives, with split-core clamp-on current transformers rated for at least DC 10 kV for 1 minute so they can be fitted on a live line.
• Temperature monitoring — the HF-C-203 cable temperature online monitoring system supports up to 256 acquisition terminals with four temperature channels each and transmits over a self-organising Zigbee network with GPRS/4G and LoRa options — the arrangement that lets one installation follow every joint along a duct.
• Fault location monitoring — the HF-C-204 cable fault location monitoring system keeps the location function armed permanently rather than only during a fault-finding visit.

How to choose cable monitoring

Decide what you need to know first: insulation condition points to partial discharge monitoring, sheath and grounding problems to current monitoring, and joint overheating to distributed temperature measurement. Then check the installation constraints — whether sensors can be fitted without a shutdown, and how the data reaches your control room (RS485, Ethernet, 4G or IEC 61850). On existing ducts, live-line installation capability usually decides which system is practical.

Every system in this section is sourced from qualified partner factories in China, verified and tested against its datasheet before shipment and delivered with its test documentation. Houfeng is a trading company and supplier, not a manufacturer.