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GE L90H00HCHF8FH6PL6PNXXSXXUXXW7J

Product Name:​ GE Multilin L90 Line Current Differential Relay (UR Series)
Product Introduction:​ The GE L90 (ordered as L90H00HCHF8FH6PL6PNXXSXXUXXW7J) is a high-end line current differential protection relay in GE’s Universal Relay family. It is intended for transmission lines and cables of different voltage levels, providing reliable and secure operation even under the worst-case power system conditions.
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Technical Specifications:
  • Manufacturer: GE Multilin (GE Grid Solutions / GE Vernova)
  • Product type: Line current differential relay, UR series
  • Protection functions: Phase-segregated line current differential with adaptive restraint, ground differential, stub-bus protection, 5-zone phase & ground distance, directional overcurrent, thermal overload, under/over-frequency, broken conductor, out-of-step, autoreclose
  • CT/VT inputs: Configurable per order code
  • Communication: IEC 61850 Ed. 2, Modbus, DNP3, IEC 61850-9-2 process bus, routable GOOSE (R-GOOSE)
  • Event recording: 1024 time-tagged events with 1 µs resolution
  • Oscillography: 64 samples/cycle, up to 64 records
  • Synchrophasors: P & M class per IEEE C37.118, 1 to 120 frames/sec
  • Display: 2 × 20 alphanumeric characters (standard); large full-colour display on certain configurations
  • Control power: 88–300 V DC @ 35 W / 77–265 V AC @ 35 VA
  • Contact inputs: 300 V DC max, 10 mA
  • Contact outputs: Standard pilot duty / 250 V AC 7.5 A, 360 VA resistive / 125 V DC break 4 A @ L/R = 40 ms / 300 W
  • Operating temperature: Per UR standard industrial range
  • Mounting: UR chassis, module plug-in with ejector/inserter clips
Functional Features:
  • Phase-segregated differential using Fourier transform “phaselet” approach with adaptive statistical restraint at 64 kbps, 2 phaselets per cycle
  • Six setting groups, selectable by user command, configurable contact input, or FlexLogic equation
  • FlexLogic user-programmable logic
  • Metering of all input currents with phasor and symmetrical component calculation
  • CT failure / current unbalance alarm logic
  • Embedded synchrophasor measurement, eliminating the need for dedicated PMUs
  • IEC 62439-3 PRP/HSR support for zero failover time
  • IEEE 1588 time synchronisation, eliminating dedicated IRIG-B wiring
Working Principle:​ The L90 computes per-phase differential currents at each line terminal, comparing local and remote current phasors communicated over a fibre or copper Ethernet channel. Adaptive restraint algorithms discriminate between internal faults and external faults with CT saturation. Distance protection zones and directional overcurrent elements provide backup protection.
Application Scenarios:​ Overhead transmission lines (including series-compensated lines), underground cables, circuits with tapped transformer feeders, three-terminal lines with channel redundancy and direct transfer tripping (DTT), single and dual-breaker circuits requiring single/three-pole autoreclosing.
Installation Requirements:
  • Install in UR chassis; modules are inserted using top and bottom ejector/inserter clips — control power must be removed from the relay before module removal/insertion
  • Verify correct module type is inserted into the correct slot
  • For CT/VT modules, short/isolate external circuits before removal for maximum safety
  • Ethernet connectors (for CPU modules except 9E) must be disconnected before module removal
  • Note: New CT/VT modules (code 8F and higher) can only be used with new CPUs (code 9E and higher) — observe the blue-label colour-match warning
Usage Precautions:
  • Review all WARNINGS and CAUTIONS in the instruction manual before installation or use
  • Inspect the unit for physical damage upon unpacking; verify the correct model on the rear nameplate
  • CT circuits must be properly shorted/isolated during maintenance to prevent dangerous open-circuit conditions
  • Ensure CPU and CT/VT module label colours match to prevent hardware mismatch errors

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