General Electric UR8FV is a CT/VT (Current Transformer/Voltage Transformer) module dedicated to the UR Series universal relays under GE Multilin. Its core function is to provide current and voltage signal acquisition and transmission support for the UR Series relays. This enhances the monitoring and management capabilities of AC power lines while improving the safety of power system equipment and operators, and it is often adapted to power system protection scenarios.

Core Positioning and Functions

Transformer Signal Supply

As a core CT/VT module, it can provide 3 channels of 1A/5A phase current transformer signals and 1 channel of 1A/5A ground current transformer signals for the UR Series relays. It is also equipped with a four-terminal voltage transformer, which can stably transmit current and voltage analog signals, providing accurate data support for the protection and control logic of the relays.

Power Monitoring Enhancement

It can help UR Series relays (such as models G60, T60, F60, C60, etc.) expand their power signal acquisition capabilities. All CT/VT modules of the same type can transmit up to 24 channels of CT and VT analog signals, significantly improving the monitoring accuracy of the operating status of AC power lines. Meanwhile, in some adapted scenarios, it can also detect faults caused by wire breakage.

System Upgrade Adaptation

It is specifically used for old module replacement or upgrade of existing UR Series universal relay systems, and can be seamlessly integrated into mature relay protection systems. However, attention should be paid to matching the CPU model of the relay—the new module needs to be paired with a new-type CPU to avoid equipment error issues.

Core Features

• High-Sensitivity Ground Protection Adaptation: In high-impedance grounding system scenarios, its sensitive ground input feature can work with the system to achieve ground fault protection. The sensitivity of the sensitive ground input is ten times that of ordinary non-sensitive modules, enabling accurate capture of slight ground abnormality signals.
• Strong Compatibility and Flexible Adaptability: As a universal accessory for the UR Series, it can be directly used as an expansion module for the series' protection devices, allowing integration without major system modifications. It also conforms to the universal installation and wiring specifications of the UR Series, and the installation process can refer to the UR Series Universal Relay Manual.
• Outstanding Operational Stability: Manufactured with high-reliability electronic components, it can meet the requirements of long-term continuous operation of power systems, reduce power monitoring interruptions caused by module failures, and ensure the continuous and effective operation of the protection system.

Typical Applications and Usage Precautions

Typical Application Scenarios

Widely used in fields such as power transmission and distribution systems and industrial high-voltage power supply circuits. It is matched with UR Series relays to build power protection systems, realizing real-time monitoring of line current and voltage, and providing a signal foundation for relay protection logics such as overload protection and short-circuit protection.

Core Usage Precautions

• Installation and wiring must strictly follow the specifications in the UR Series Universal Relay Manual to avoid affecting signal transmission due to improper wiring.
• When replacing or upgrading, the CPU model must be matched: old-model modules correspond to old-version CPUs, and new-model modules are paired with new-type CPUs.
• Detailed wiring methods and troubleshooting guides can be obtained from the UR Series Universal Relay Manual provided by GE official.

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