Oscillography of current, voltage, FlexLogic™ operands, and digital signals (1 × 128 cycles to 31 × 8 cycles configu-
Events recorder: 1024 events.
Actual 87L remote phasors, differential current, channel delay, and channel asymmetry at all line terminals of line cur-
rent differential protection.
Line current, voltage, real power, reactive power, apparent power, power factor, and frequency.
Front panel RS232 port: 19.2 kbps.
One or two rear RS485 ports: up to 115 kbps.
10Base-F Ethernet port supporting the IEC 61850 protocol.
The L90 is available as a 19-inch rack horizontal mount or reduced-size (¾) vertical unit and consists of the following mod-
ules: power supply, CPU, CT/VT, digital input and output, transducer input and output, and inter-relay communications.
Each of these modules can be supplied in a number of configurations specified at the time of ordering. The information
required to completely specify the relay is provided in the following tables (see chapter 3 for full details of relay modules).
Order codes are subject to change without notice. Refer to the GE Multilin ordering page at
The order code structure is dependent on the mounting option (horizontal or vertical) and the type of CT/VT modules (regu-
lar CT/VT modules or the HardFiber modules). The order code options are described in the following sub-sections.
for the latest details concerning L90 ordering options.
L90 Line Current Differential System
2 PRODUCT DESCRIPTION