The UR8AH is a CT/VT module in GE Multilin's UR series of universal relays. Here is a detailed description of it:

Functional characteristics

High-precision measurement: It can accurately measure the current and voltage in the power system to provide accurate data support for the stable operation and protection of the power system.

Compact design: small space, easy to install and integrate into a variety of power system equipment, can effectively save equipment installation space.

Wide range of operating conditions: can operate stably in a variety of working environments and conditions, adapt to different power system application scenarios, such as different temperature, humidity, voltage fluctuations and other environments.

Improved safety: By partially grounding the transformer's secondary windings, overall operator safety is improved, while faults within the system that could create unsafe conditions are identified and corrected.

UR8AH CT/VT module Functional characteristics

High-precision measurement: It can accurately measure the current and voltage in the power system to provide accurate data support for the stable operation and protection of the power system.

Compact design: small space, easy to install and integrate into a variety of power system equipment, can effectively save equipment installation space.

Wide range of operating conditions: can operate stably in a variety of working environments and conditions, adapt to different power system application scenarios, such as different temperature, humidity, voltage fluctuations and other environments.

Improved safety: By partially grounding the transformer's secondary windings, overall operator safety is improved, while faults within the system that could create unsafe conditions are identified and corrected.

Technical parameter

Size: Approx. 15cm (L) ×18cm (W) ×4cm (H).

Weight: 2 pounds, 9 ounces.

Input range: Current 0-8A, voltage 0-600V.

CT ratio: 1A/5A, 5A/1A, 10A/1A, 20A/1A.

VT ratio: 60V/120V, 120V/240V, 240V/480V.

Accuracy: 0.25%.

Stability: 0.1%.

Operating temperature range: -40°C to + 85°C.

Power supply: 24V DC.

Software support: CT and VT related Settings are available through the EnerVista UR software program, which provides an improved and simplified user interface for system configuration, data viewing, trend analysis, and data export.

Applications: Widely used in power generation, transmission and distribution systems, as well as industrial and commercial applications requiring accurate current and voltage measurement, such as power system monitoring in factories, power management in commercial buildings, etc.

GE Multilin UR series of general purpose relays are widely used, and the models related to UR8AH have certain correlation and differences in function, performance and application scenarios, the following is a detailed introduction for you:

Same function different specifications model

UR8BH

Features: Like UR8AH, it is a CT/VT module for current and voltage measurement. However, there may be different specifications in terms of measurement accuracy and input range. For example, UR8BH may have better linearity and accuracy when measuring higher currents or voltages, which is suitable for applications where measurement accuracy is very high, such as main transformer monitoring in large power plants.

UR8CH

Features: The same current and voltage measurement function, may be different in the input and output interface, communication protocol support. For example, it may support more types of communication interfaces, facilitate data interaction with different types of monitoring systems, and can be used for some distributed power system monitoring projects with high communication compatibility requirements.

Different functional complementary models

UR5

Functional features: It is a multi-functional relay, focusing on the protection functions of the power system, such as overcurrent protection, overvoltage protection, undervoltage protection, etc. When used together with UR8AH, UR8AH is responsible for accurate measurement of current and voltage, while UR5 judges and executes corresponding protection actions according to the measured value, both of which jointly ensure the safe and stable operation of the power system, and are often used for line protection and equipment protection of substations.

UR6

Features: With protection and control functions, in addition to the basic protection functions, but also to control the power equipment, such as the on-off switch control. When combined with UR8AH, it can realize more comprehensive monitoring, protection and control of the power system, and can be applied to the self-provided power station of industrial enterprises to realize the integrated management of power generation equipment and distribution system.

Models fit different application scenarios

UR8AH - I

Features: Customized version for industrial grade, optimized for complex working conditions in industrial environment. It has stronger anti-interference ability, wider working temperature range and higher protection level, and can work stably in harsh industrial environment such as high temperature, humidity and strong electromagnetic interference, and is suitable for power system monitoring in steel plants, chemical plants and other industrial places.

UR8AH - A

Features: It is an aerospace grade custom model to meet the stringent requirements for equipment reliability, safety and lightweight in the aerospace field. Special materials and processes are used to reduce weight and improve anti-radiation ability, which is suitable for power system monitoring of aircraft, satellites and other aerospace equipment.