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GE B30H00HCHF8HH6PL8HN6PS8FU6PWXX

Product Name:​ GE Multilin B30 Bus Differential Relay (UR Series)
Product Introduction:​ The GE B30 (ordered as B30H00HCHF8HH6PL8HN6PS8FU6PWXX) is a bus differential protection system in GE’s Universal Relay family. It provides advanced protection for a wide range of bus differential applications, integrating protection, monitoring, metering, communication, and control in one device.
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Detailed content

Technical Specifications:
  • Manufacturer: GE Multilin (GE Grid Solutions)
  • Product type: Bus differential system, UR series
  • Protection elements: 87B restrained bus differential, 50/87 unrestrained bus differential, phase/neutral/ground overcurrent (50P/51P, 50N/51N, 50G/51G), thermal overload (49), breaker failure (50BF), undervoltage (27P), overvoltage (59P/59N), directional overcurrent (67P/67N), autoreclose (79), synchrocheck (25), underfrequency (81U)
  • Bus differential pickup: 0.05 to 6.000 pu in steps of 0.001; slope 15% to 100%; operate time: one power system cycle (typical)
  • CT ratio mismatch tolerance: up to 32:1 between terminals
  • 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
  • Communication: IEC 61850 Ed.2, Modbus, DNP3, IEC 62439-3 PRP/HSR, IEEE 1588
  • Event recorder: 1024 time-tagged events with 0.5 ms digital input scan
  • Oscillography: 64 samples/cycle, up to 64 records
  • Mounting: UR chassis, modular plug-in construction
Functional Features:
  • No dedicated or interposing CTs required — reduces overall system cost
  • Advanced features: breaker failure, CT trouble detection, undervoltage supervision, dynamic bus replica
  • Extreme flexibility with CT ratio mismatch up to 32:1 between terminals
  • Three independent 100 Mbps Ethernet ports for purpose-specific LAN support
  • Embedded IEEE 1588 time-synchronisation, eliminating dedicated IRIG-B wiring
  • CyberSentry™ cyber-security aligned to NERC CIP, AAA, Radius, RBAC, Syslog
  • FlexLogic programmable logic for customised protection and control schemes
Working Principle:​ The B30 sums the currents from all CTs connected to the protected bus zone, computing the differential current. Under normal conditions the differential current is near zero; an internal bus fault produces a significant differential current, triggering the restrained or unrestrained bus differential elements to issue a high-speed trip command to all connected breakers.
Application Scenarios:​ Bus differential protection in substations and industrial power systems, including applications with up to 32:1 CT ratio mismatch between terminals; stand-alone or integrated within automated substation control systems.
Installation Requirements:
  • Install modules in the UR chassis using ejector/inserter clips — remove control power before module removal/insertion
  • Verify correct module type is inserted into the correct slot position
  • For CT/VT modules, short/isolate external CT/VT circuits accordingly for maximum safety before removal
  • Ethernet connectors on CPU modules must be individually disconnected before module removal
  • Observe the “Ensure CPU and DSP module label colours are the same” warning — new modules have blue labels; mismatched modules will trigger a HARDWARE MISMATCH error
Usage Precautions:
  • Review all WARNINGS and CAUTIONS in the B30 instruction manual before installation or use
  • Inspect the relay packaging for physical damage and verify the correct model on the rear nameplate
  • CT circuits must be properly shorted/isolated during maintenance
  • The 4.0x release of the B30 includes new hardware modules (CPU codes 9E and higher, CT/VT codes 8F and higher) — new and old modules are not cross-compatible

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