CA01065E_Catalog 70

Ground Lead Disconnector Distribution arresters are commonly supplied with a ground lead disconnector (GLD). This accessory is provided to allow continued system operation in the rare event of an arrester short circuit. It additionally provides a visual indication that an arrester has disconnected to field personnel. This feature allows identification of equipment that is unprotected and ensures efficient use of personnel resources. The Hubbell GLD is a patented capacitive graded design which offers enhanced current sensitivity compared to conventional disconnectors. Additionally, other designs which are resistively graded tend to thermally fail during TOV or end of life events. This can impair successful disconnection of a shorted arrester and lead to outages and dissatisfied customers.

IEEE and IEC standards require a disconnector operate at currents ranging from 20 to 800 Amps. The Hubbell design operates at currents as low as 1 Amp. It additionally prevents thermal runaway scenarios that may occur with resistive graded disconnectors.

Page 16 | May 2022