The SPi range of fault passage indicators is designed for application to distribution networks where manually operated or automated switchgear is installed. When current above a threshold level is detected, the indicator operates alarm contacts for remote indication and illuminates an integral high brightness Light Emitting Diode (LED). Indicators strategically placed in the distribution network aid identification of a faulty section.
These products are used to aid fault finding on electricity distribution networks and reduce the disruption to consumers during fault conditions. Faulty sections of the network can be identified and isolated while healthy sections are restored. Earth fault and overcurrent variants are available.
Many faults on the low voltage (LV) networks are caused by gradual degradation of underground cables, allowing water ingress. This causes an arc, which often vaporises the water and clears the fault. These faults are known as ‘transient faults’ or ‘pecking faults’ and are invisible to the Distribution Network Operators (DNO) and customers. As the cables degrade further, these faults may be sufficient to cause fuses to blow, causing power disruption.