ABB CM-UFD Frequency Monitoring Relays

ABB CM-UFD Frequency Monitoring Relays Supplier and Exporter in India

ABB Frequency & Grid Monitoring Relays for Power Generation Systems

ABB CM-UFD is a range of frequency and grid monitoring relays used to supervise the electrical connection between distributed power generation systems and the public grid.

The relay continuously checks grid frequency and voltage. If the frequency rises above or falls below the permitted limits, the CM-UFD can operate the interface switching device and disconnect the generating system from the grid. The same relay also monitors overvoltage, undervoltage and other grid conditions depending on the model and configuration.

ABB CM-UFD relays are mainly used with solar PV plants, battery energy storage systems, hydroelectric plants and other distributed generation systems rather than as simple frequency relays for general machine control.

The range includes different models developed around country-specific grid connection requirements. Versions with Modbus RTU communication are also available.

For an ABB frequency monitoring relay supplier in India, ABB CM-UFD grid monitoring relay, underfrequency relay, overfrequency relay or CM-UFD export requirement, buyers should share the complete model, grid voltage, applicable grid standard and project country before quotation.

ABB CM-UFD Frequency Monitoring Relay Models

ABB CM-UFD.M22 / CM-UFD.M22M

CM-UFD.M22 is designed for grid monitoring according to CEI 0-21, mainly associated with Italian grid-connected generation applications.

It monitors:

• Overfrequency
• Underfrequency
• Overvoltage
• Undervoltage
• 10-minute average voltage
• ROCOF – rate of change of frequency

CM-UFD.M22M adds Modbus RTU communication.

ABB CM-UFD.M31 / CM-UFD.M31M

CM-UFD.M31 is used for network and system protection in distributed generation applications and is associated with standards used in markets including Germany, Austria and Switzerland.

Monitoring functions include:

• Overfrequency
• Underfrequency
• Overvoltage
• Undervoltage
• Phase monitoring
• Grid condition supervision
• Loss-of-mains functions

CM-UFD.M31M provides Modbus RTU communication for remote monitoring and data exchange.

ABB CM-UFD.M33 / CM-UFD.M33M

CM-UFD.M33 is intended for generating plants connected to distribution networks and is used with grid requirements including G99 in Great Britain, along with applicable standards in other markets.

Functions include:

• Frequency increase monitoring
• Frequency decrease monitoring
• Voltage increase monitoring
• Voltage decrease monitoring
• 10-minute average voltage
• ROCOF
• Vector shift monitoring where configured

CM-UFD.M33M is the Modbus RTU version.

ABB CM-UFD.M34 / CM-UFD.M34M

CM-UFD.M34 is associated with grid-feeding applications covered by DEWA DRRG requirements, making this series particularly relevant for projects in the Middle East.

It monitors grid voltage and frequency and can detect:

• Overfrequency
• Underfrequency
• Overvoltage
• Undervoltage
• ROCOF
• Vector shift

The CM-UFD.M34M version includes Modbus RTU communication.

ABB CM-UFD.M35M

CM-UFD.M35M is another grid-feeding monitoring version designed around specific network connection requirements.

It provides voltage and frequency monitoring along with functions required for safe disconnection of distributed generation from the public grid.

This model is associated with requirements including VDE 0126-1-1 and is supplied with Modbus communication.

Technical Specifications

• Product family: ABB CM-UFD
• Product type: Grid-feeding / frequency and voltage monitoring relay
• Frequency monitoring: Overfrequency and underfrequency
• Voltage monitoring: Overvoltage and undervoltage
• System monitoring: Single-phase and three-phase AC networks
• Network types: 2-wire, 3-wire and 4-wire systems
• Measuring principle: True RMS
• Frequency thresholds: Adjustable
• Voltage thresholds: Adjustable
• Two-level frequency threshold settings
• Two-level voltage threshold settings
• 10-minute average voltage monitoring
• ROCOF monitoring: Available on applicable models
• Vector shift detection: Available on selected models
• Loss-of-mains protection: Available depending on model
• Interrupted neutral detection: Available
• Control inputs: Remote trip, feedback and external signal functions
• Output contacts: 3 changeover contacts
• Display: Multiline backlit LCD
• Event/error memory: Up to 99 entries
• Password protection for settings
• DIN rail mounting
• Modbus RTU versions: Available
• ABB Ability integration: Available on applicable Modbus models

Features

• Overfrequency and underfrequency monitoring
• Overvoltage and undervoltage monitoring in the same relay
• Suitable for grid-connected renewable energy systems
• Adjustable frequency and voltage thresholds
• Single-phase and three-phase grid monitoring
• ROCOF monitoring on applicable models
• Vector shift detection on selected versions
• Loss-of-mains protection
• LCD for measured values and settings
• Stores recent fault and event information
• Remote trip and feedback inputs
• Three changeover output contacts
• Modbus RTU versions available
• Different models for different national grid standards
• Suitable for new grid connection and retrofit projects

ABB Overfrequency & Underfrequency Monitoring Relay

Grid frequency has to remain within the limits specified by the utility or applicable grid code.

If generation and demand become unbalanced, frequency can move above or below its normal operating level. A CM-UFD relay continuously measures this frequency and compares it with the programmed limits.

If an underfrequency or overfrequency condition occurs, the relay can send a trip command to the interface switch and disconnect the generating plant from the grid.

Once acceptable grid conditions return and the required reconnection conditions are met, the system can be connected again according to the configured settings.

ABB CM-UFD for Solar PV & Renewable Energy Systems

One of the main applications for CM-UFD relays is grid-connected renewable power generation.

Typical installations include:

• Solar photovoltaic plants
• Rooftop solar systems
• Commercial solar projects
• Industrial captive solar plants
• Hydroelectric generation
• Battery energy storage systems
• Distributed generation plants
• Other grid-connected generating systems

The CM-UFD sits between the generating installation and the public network and monitors whether grid voltage and frequency remain within the permitted limits.

If an abnormal grid condition occurs, the relay operates the interface protection arrangement so the generating system does not continue feeding an unstable or disconnected network.

ABB CM-UFD Loss of Mains Protection

Selected CM-UFD models provide additional loss-of-mains functions such as:

• ROCOF – Rate of Change of Frequency
• Vector Shift

These functions can help identify abnormal grid conditions that may not be detected quickly enough by frequency limits alone.

The exact loss-of-mains function required depends on the grid standard and utility requirements for the project.

ABB CM-UFD Modbus RTU Models

ABB offers Modbus versions of several CM-UFD relays.

These include:

• CM-UFD.M22M
• CM-UFD.M31M
• CM-UFD.M33M
• CM-UFD.M34M
• CM-UFD.M35M

Modbus communication allows operating data and measured values to be transferred to a supervisory or energy-management system.

This can be useful for:

• Remote grid monitoring
• Event analysis
• Plant supervision
• Energy management
• Remote fault checking
• Collection of voltage and frequency data

For projects where communication is required, buyers should specify the M version rather than assuming the standard and Modbus models are interchangeable.

Applications

ABB CM-UFD relays are used in:

• Solar PV power plants
• Rooftop solar installations
• Commercial solar projects
• Industrial solar power systems
• Hydroelectric power plants
• Battery energy storage systems
• Distributed generation
• Grid-connected generators
• Renewable energy plants
• Utility interface panels
• Generator synchronisation and interface panels
• Low-voltage grid connection systems
• Industrial captive generation
• Grid protection panels
• Network decoupling systems
• Power generation control panels
• Existing grid protection retrofit projects

Selecting the Correct ABB CM-UFD Relay

CM-UFD should not be selected only by voltage or frequency range. The country and applicable grid code are important, because different CM-UFD versions have been developed and certified for different network requirements.

For quotation, buyers should provide:

• Required CM-UFD model
• Project country
• Applicable utility or grid standard
• Single-phase or three-phase system
• Grid voltage
• Nominal frequency – 50 Hz or 60 Hz
• Modbus communication requirement
• ROCOF requirement
• Vector shift requirement
• Quantity
• End-user / project details

For an existing installation, the complete model and nameplate photograph should be provided.

Looking for ABB CM-UFD Frequency Monitoring Relays?

We supply ABB CM-UFD frequency and grid monitoring relays for solar PV plants, renewable energy projects, distributed generation, industrial power systems and export requirements.

Enquiries are welcome for ABB CM-UFD.M22, CM-UFD.M22M, CM-UFD.M31, CM-UFD.M31M, CM-UFD.M33, CM-UFD.M33M, CM-UFD.M34, CM-UFD.M34M and CM-UFD.M35M.

For an ABB frequency monitoring relay supplier and exporter from India, ABB underfrequency relay, ABB overfrequency relay, CM-UFD grid protection relay or CM-UFD Modbus relay requirement, send the exact model, project country, grid standard and quantity for quotation.