Low-voltage ride-through (LVRT) function for renewables interconnection protection to secure grid code compliance.
Enhanced intermittent earth-fault protection for increasingly complex distribution networks.
New hardware modules including high-current and high-speed tripping modules with trip circuit supervision.
Line differential protection (IdL>; ANSI 87L)
The AQ-F255 Feeder and line differential protection device offers modular, high I/O capacity, plug and play protection and control solution for line differential protection applications. Two variants featuring line differential protection are available:
Cost-efficient line differential protection with additional current protection functionality (AQ-F255B).
Line differential protection with all standard current and voltage-based protection functions providing a combination of full feeder protection and line differential protection in a single device (AQ-F255C).
A transformer can be included in the protected zone of the AQ-F255 devices that trip as fast as in 20 ms. The communication between the master node and sub-node devices is performed over a fast, smart process bus, and is easy to set.
The process bus enables ultra-fast transfer trip with 3–5 ms trip of the remote end. The process bus transfers both standard data and up to 64 user-defined signals between the substations. It also automatically synchronizes the line differential protection settings from the master node device to the sub-node device. The process bus also handles the compensation for delays in communication, which eliminates the need of external time synchronization.
Line differential protection with a smart dedicated process bus for up to 120 km distance.
Cybersecurity in accordance with IEC 62443-4-2 Security Level 1 (SL1)
All AQ 250 series devices are now compliant with Security Level 1 (SL1) of the IEC 62443-4-2 standard.
Devices are cryptographically signed during production.
Firmware updates are signed and verified for authenticity.
TLS encryption to ensure secure data communication.
Platform hardening for improved security and integrity of the protection and control system.
Low-voltage ride-through (LVRT; ANSI 27T)
Low-voltage ride-through (LVRT) enables e.g. distributed cogeneration and renewable power generation sites to stay connected through short periods of voltage sags due to faults in the network. AQ 250 series protection devices feature a LVRT functionality that detects the voltage sags and prevents unnecessary disconnection of power generation and larger blackouts due to cascading disconnection of generators during voltage dips.
Low-voltage ride through operating principle to avoid larger blackouts due to cascading disconnection of generators during voltage dips.
Arcteq’s patented sample-based intermittent earth fault protection has been enhanced to provide dependable operation of the protection function in increasingly complex distribution networks. The protection function now adapts to varying transient conditions of different configurations of mixed networks consisting of both overhead lines and cables.
New hardware modules
All AQ 250 series devices support several new hardware option modules. The new modules available are:
high-current and high-speed tripping module with trip circuit supervision
new mA input and output modules
SFP module-based Ethernet communication module.
About AQ 250 series
The AQ 250 series protects and controls a large variety of applications, including demanding applications that require comprehensive functionality and a possibility to add more I/O modules or expanding communication capabilities. With the AQ 250 series, generator and transformer protection can be managed with high functional integration and less hardware, which makes the protection system more reliable, cost-efficient and easier to maintain. The free-of-charge AQtivate 200 configuration and parameter setting tool allows you to adjust the functionalities to match the application needs. All AQ 250 series devices support IEC 61850 Edition 2, along with a wide range of other communication protocols.
