L90-W02-HKH-F8LH6N-L8L-N6N-S6PU67-W7G Line Current Differential System

Product Description

Offering protection and management functions for overhead lines, circuits with tapped transformer feeders, and single and dual-breaker circuits requiring autoreclosing functions, General Electric Multilin’s L90-H03-HKH-F8L-H6D-L6C-NXX-SXX-UXX-W7I is a Line Current Differential System. The relay can detect higher impedance ground faults due to its adaptive statistical restraint approach.

Each contact output/input module possesses twenty-four terminal connections. They are configured in an eight by three fashion, and each row of three terminals can be tasked with the outputs of a single relay. For the form-C relay outputs, a relay’s normally closed (NC), normally open (NO), and common contacts connect to the row of three terminal connections. Prospective buyers should reference the 1601-0081-AB2 user manual since contact arrangements vary between system models.

The L90-H03-HKH-F8L-H6D-L6C-NXX-SXX-UXX-W7I has a built-in error detection system that safeguards the L90 by identifying incorrect data that would otherwise lead to misoperation. The relay computes high-bit errors using a 32-bit CRC check. Beyond this monitoring feature, the relay can also use GPS time synchronization to address channel asymmetry on multiplexed channels. This feature can compensate for up to 10ms of channel asymmetry. 

The relay is capable of power system troubleshooting, able to record the operation of internal elements and time-stamp those logs in order to provide a sequence of operations. It can also graphically display ground phase distance elements for user-selected zones and analyze line faults at a rate of 64 samples per cycle. These features reduce time spent troubleshooting and give users a better understanding of their system and its needs.