ODES PT Bus Voltage Transfer Relays in Overseas Projects

Dual-bus substations are common in transmission and renewable integration projects, but managing PT voltage transfer through discrete components often leads to complex wiring and inconsistent signaling. EPC contractors and system integrators working overseas seek compact, centralized modules that simplify bus voltage switching and integrate undervoltage supervision in a single device, compliant with international standards and CE certification.

The GRUS-11G/11GS PT bus voltage transfer relay series provides a unified solution. It combines PT transfer logic, bus position signaling, and PT undervoltage alarm contacts within one standardized housing—helping engineers achieve clear indication, reduced wiring, and faster commissioning.

Core Features

• Integrated function design – Performs bus voltage transfer, bus-position signaling, and PT undervoltage alarming in one unit.

• Configurable models –

• Comprehensive outputs – 9 NO + 1 NC contact set, including PT undervoltage alarm and bus transfer signals.

• Fast performance – Short operate and release times ensure reliable coordination with PT switching logic.

• Clear human-machine interface – Front panel indicators show I BUS ACT and II BUS ACT status at a glance.

• Standardized installation – Embedded panel size, consistent terminal mapping, and CE certification for overseas cabinet integration.

• Wide coil options – 110 V DC / 220 V DC versions available to suit local supply standards.

Application Example: 132/33 kV Renewable Substation

A newly built renewable integration substation required centralized PT bus switching with simultaneous undervoltage alarming. The GRUS-11GS dual-position relay was implemented to replace discrete relays and auxiliary contacts. Result: cabinet wiring density was reduced by over 30 %, all alarms and transfer functions passed testing on first attempt, and the relay’s standardized terminal layout simplified remote signal mapping to SCADA.

Engineering Value

• Simplified architecture – one relay replaces multiple discrete elements for PT transfer and supervision.

• Lower wiring effort – fewer interconnections mean shorter installation and commissioning times.

• Enhanced maintainability – clear indication and unified terminal labeling reduce troubleshooting time.

• Global compatibility – CE-certified, IEC-tested design aligns with international project documentation and EPC requirements.

By consolidating PT transfer and undervoltage monitoring into a single module, the GRUS-11G/11GS series offers a modern, export-ready solution for dual-bus substations. It improves reliability, reduces complexity, and provides the clarity and compliance global projects demand.

Upgrading or designing dual-bus substations for overseas delivery?

• Request wiring diagrams and application notes for GRUS-11G/11GS integration.

• Discuss with our engineers how to streamline PT transfer, undervoltage alarms, and bus indication within your panel design.

• Deliver cleaner wiring, faster commissioning, and full international compliance in your next project.

Contact:📩 tonyzhang@odes.com.cn

Or visit: 🌐 https://www.odes-electric.com/

#PTBusSwitching #VoltageTransferRelay #DualBusSystem #PTSwitching #UndervoltageAlarm #AuxiliaryRelays #ControlCircuits #RelayProtection #ReliabilityEngineering #SecondaryCircuits #SubstationAutomation #IECCompliance #CECertification #PowerEngineering #ElectricalEngineering #IndustrialAutomation #UtilitySolutions #GridResilience #EnergySystems #SmartGrid