GE Multilin UR 67H Retrofit-Compatible Protection Relay

GE Multilin UR 67H Retrofit-Compatible Protection Relay: Seamless Legacy System Upgrade

The GE Multilin UR 67H is a ruggedized, high-performance protection relay engineered for demanding industrial and power system environments. As part of GE Multilin’s Universal Relay (UR) platform, the UR 67H delivers directional overcurrent protection (ANSI 67/67N) with full compatibility across the UR series chassis and communication infrastructure. For facilities managing aging protection schemes, the UR 67H represents a proven, field-validated path to modernizing legacy relay panels without requiring a full system overhaul.

NINERMAS maintains verified stock of the UR 67H with a 12-month warranty, pre-shipment functional testing, and dedicated retrofit support for engineering teams navigating panel upgrades, substation modernization, and spare parts lifecycle management.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Replacing a legacy protection relay in an active substation or industrial switchgear panel demands careful pre-engineering. When integrating the GE Multilin UR 67H into an existing UR platform chassis, the first step is auditing the installed UR series CPU module firmware version to confirm cross-compatibility with the 67H function module. Facilities running older UR firmware (pre-7.x) may need a coordinated firmware upgrade on the CPU before the 67H module can be recognized correctly on the backplane.

Terminal wiring is a critical checkpoint. The UR 67H uses the standard UR rear terminal block layout, but engineers must verify that existing CT secondary circuits (typically 1A or 5A rated) are correctly mapped to the relay’s current input channels. Any mismatch in CT polarity or circuit numbering between the old module and the UR 67H can result in incorrect directional element operation — a risk that must be eliminated during bench testing before field installation.

For facilities also upgrading their UR series power supply module (such as the GE Multilin PSM-A or PSM-D), this is an ideal time to confirm that the DC bus capacity supports the combined load of the 67H module alongside other installed modules such as the GE Multilin I/O module (IOM) for digital input/output expansion, or the GE Multilin transducer input module (TDM) used for analog signal monitoring. Overloading the internal power bus is a common oversight during multi-module retrofits.

Communication migration is another area requiring structured planning. Many legacy installations rely on Modbus RTU over RS-485 for SCADA integration. The UR 67H supports Modbus RTU natively, but if the project scope includes migrating to IEC 61850 GOOSE messaging for peer-to-peer protection schemes, the GE Multilin UR series communications module (COM) must be present and correctly configured. Engineers should map all existing Modbus register addresses to the new UR 67H register map before cutover to avoid SCADA data loss.

For sites using GE Multilin HMI panels or third-party SCADA displays tied to the relay’s front-panel data, screen templates and data point mappings should be reviewed and updated in parallel. The UR 67H’s EnerVista UR Setup software provides a settings migration wizard, but custom logic blocks and FlexLogic equations from the legacy module must be manually validated and re-entered if the source settings file is from an incompatible firmware generation.

Backplane slot assignment is also worth confirming early. In a multi-slot UR chassis such as the GE Multilin C60 or D60, each module slot is assigned a specific function type. The 67H must be installed in a slot designated for protection function modules — not in slots reserved for CPU, power supply, or communications modules. Incorrect slot placement will prevent the module from initializing and may generate chassis fault alarms.

Finally, for sites managing a broader spare parts program, it is advisable to stock complementary components alongside the UR 67H: a spare UR series CPU module, at least one UR power supply module, and a GE Multilin programming cable (USB or RS-232 to UR front port) for on-site EnerVista access. NINERMAS supports long-term procurement planning for UR platform components with confirmed lead times and 12-month warranty coverage across the full module range.

Downtime Control During System Migration

Minimizing unplanned downtime during a UR 67H retrofit requires a structured cutover methodology. The recommended approach is a parallel commissioning sequence: the replacement module is fully configured, tested, and verified on the bench using EnerVista UR Setup before the legacy module is removed from service. This includes loading the migrated settings file, running a complete protection element test using a relay test set (such as a OMICRON CMC or Megger SMRT series), and confirming all output contact assignments match the existing panel wiring diagram.

During the physical swap, CT circuits must be shorted before disconnecting the old module to prevent open-circuit CT secondary hazards. The UR 67H’s rear terminal block design allows for a structured disconnect sequence — power supply terminals first, then CT/VT circuits (with shorting blocks in place), then communication cables. Reconnection follows the reverse order, with CT shorting blocks removed only after all terminal connections are confirmed secure.

Once the UR 67H is installed and powered, the commissioning sequence should include: confirming module recognition on the UR chassis backplane, verifying protection element pickup values against the approved relay coordination study, testing all digital input and output contacts, and confirming SCADA communication link restoration. For IEC 61850 environments, GOOSE subscription and publication datasets should be verified using a protocol analyzer before declaring the relay in service.

A well-executed UR 67H retrofit can typically be completed within a 4–8 hour planned outage window, provided all pre-commissioning steps are completed in advance. NINERMAS provides pre-shipment functional testing documentation and can coordinate with engineering teams on settings file preparation to further compress on-site commissioning time.

Retrofit Support FAQ

Q1: Is the GE Multilin UR 67H a direct replacement for the SR750 or SR760 series relays?
The UR 67H is not a plug-and-play replacement for the SR750/SR760, as those are standalone relays with different form factors and terminal layouts. However, the UR 67H can replace the directional overcurrent protection function within a UR platform chassis, effectively modernizing the protection scheme of a panel that previously relied on SR-series relays. A panel modification and wiring adaptation will be required.

Q2: Can the UR 67H settings be migrated from an older UR 6-series module?
Settings migration from earlier UR 6-series modules is supported via EnerVista UR Setup, but firmware version compatibility must be confirmed. Settings files from firmware versions below 7.x may require manual re-entry of certain protection group parameters and FlexLogic equations. NINERMAS recommends requesting the existing settings file from the site engineer before shipment so that compatibility can be assessed in advance.

Q3: What communication protocols does the UR 67H support for SCADA integration?
The UR 67H supports Modbus RTU, Modbus TCP, DNP3 (serial and TCP), IEC 60870-5-104, and IEC 61850 (with the appropriate communications module installed). Protocol selection and register mapping should be confirmed against the existing SCADA system configuration before cutover to ensure seamless data continuity.

Q4: What warranty and stock availability does NINERMAS offer for the UR 67H?
NINERMAS maintains verified stock of the GE Multilin UR 67H with a 12-month warranty covering manufacturing defects and functional performance. All units undergo pre-shipment functional testing. For long-term spare parts programs or bulk procurement, contact our team at sale@ninermas.com or +0086 187 5021 5667 to discuss lead times, pricing, and lifecycle support agreements.