AQ-ONE
One relay.
Three sizes.
Unlimited applications.
AQ-ONE is everything in one.
AQ-ONE is the one product designed to meet your every protection and control need — a unified concept with true scalability. One software environment defines functionality and configuration, while a single hardware platform — available in three mechanical sizes — enables cost optimization and ensures a perfect fit for any installation.
AQ-ONE is flexibly packaged and optimized for power systems up to 150 kV, while also offering a powerful and reliable solution for higher voltage grids depending on the application.
One software
Every AQ-ONE relay operates on the same firmware and follows the same operating principles. This ensures a uniform user experience, no matter which hardware size you choose.
- Same logic and behavior in every device.
- Extensive function packages that include everything typically needed for each application.
- The relay’s functionality can be expanded at any time by adding optional function packages.
All AQ-ONE relays are configured, set, and commissioned using a single tool — AQtivate — ensuring a consistent engineering workflow and reducing training needs for maintenance staff.
One hardware
AQ-ONE is built on a single hardware concept and it is available in three mechanical relay sizes.
- You can choose the relay size that fits your space and I/O needs, ensuring that you only pay for what you use.
- With AQ-ONE you always have the right spare parts in stock: all cards are fully compatible with all three sizes.
Unlimited applications
AQ-ONE offers function packages for a wide range of protection applications, including line differential and distance protection. Each package can be tailored to deliver the exact functionality your application requires. And as needs evolve, you can upgrade or switch function packages at any time to meet your new requirements.
AQ-ONE protection and control relay is both new and proven. Built on the foundations of the AQ 200 series, it carries forward the same strengths.
- Inherited accuracy of power and energy measurement with up to 0.2 % inaccuracy, throughout the frequency swipe 6–75 Hz. This makes AQ-ONE the most accurate protection relay in the world.
- Extensive selection of communication protocols is always included.
- Built-in cybersecurity in compliance with IEC 62443-4-2, Security Level 1.
Configure your AQ-ONE
Arcteq’s product configurator helps you define the AQ‑ONE configuration that fits your application. It generates a unique order code and a detailed product datasheet based on your selected configuration.
Once your configuration is ready, you can request a quotation directly in the configurator and attach supporting documents such as specifications or single-line diagrams.
Configure your AQ-ONE
Application function packages
The feeder protection application function package includes the following:
- Non-directional overcurrent – 50/51 (I>)
- Non-directional earth fault – 50N/51N (I0>)
- Negative sequence overcurrent; Phase current reversal; Current unbalance – 46/46R/46L (I2>)
- Harmonic overcurrent – 50H/51H/68H (Ih>)
- Circuit breaker failure protection – 50BF/52BF (CBFP)
- High- or low-impedance restricted earth fault; Cable end differential – 87N (I0d>)
- Line thermal overload – 49F (TF>)
- Auto-recloser – 79 (AR)
- Fault locator – 21FL
- Switch-on-to-fault – SOTF
You can also add the following additional function packages to expand the functionality of your device:
- Single-phase protection – Single-pole non-directional overcurrent protection 50/51 (I>)
- Voltage protection – 59N (U0>), 59 (U>), 27 (U<), 27T (LVRT), 47/27P/59PN (U1/U2>/<) 81O/81U (f>/<), 81R (df/dt>/<), 79N (U0 RECL), 25 (ΔV/Δa/Δf), 78 (Δφ), 24 (V/Hz)
- Synchronizer – 25 (ΔV/Δa/Δf)
- Directional protection – 67 (Idir>), 67/32N (I0dir>), 67NT (I0int>), 32 (P,Q,S>/<), 59N (U0>)
- Power measurement – Power and energy measurement, Programmable stages 99
The transformer protection application function package includes the following:
- Non-directional overcurrent – 50/51 (I>)
- Non-directional earth fault – 50N/51N (I0>)
- Negative sequence overcurrent; Phase current reversal; Current unbalance – 46/46R/46L (I2>)
- Harmonic overcurrent – 50H/51H/68H (Ih>)
- Circuit breaker failure protection – 50BF/52BF (CBFP)
- High- or low-impedance restricted earth fault; Cable end differential – 87N (I0d>)
- Line thermal overload – 49F (TF>)
You can also add the following additional function packages to expand the functionality of your device:
- Voltage protection – 59N (U0>), 59 (U>), 27 (U<), 27T (LVRT), 47/27P/59PN (U1/U2>/<) 81O/81U (f>/<), 81R (df/dt>/<), 79N (U0 RECL), 25 (ΔV/Δa/Δf), 78 (Δφ), 24 (V/Hz)
- Automatic voltage regulator – 90 (transformer AVR for up to four parallel transformers)
- Machine differential protection – 87T/87G/87M/87N (Idx>)
- Directional protection – 67 (Idir>), 67/32N (I0dir>), 67NT (I0int>), 32 (P,Q,S>/<), 59N (U0>)
- Power measurement – Power and energy measurement, Programmable stages 99
The line protection application function package includes the following:
- Teleprotection – 85
- Non-directional overcurrent – 50/51 (I>)
- Non-directional earth fault – 50N/51N (I0>)
- Negative sequence overcurrent; Phase current reversal; Current unbalance – 46/46R/46L (I2>)
- Harmonic overcurrent – 50H/51H/68H (Ih>)
- Circuit breaker failure protection – 50BF/52BF (CBFP)
- High- or low-impedance restricted earth fault; Cable end differential – 87N (I0d>)
- Line thermal overload – 49F (TF>)
- Auto-recloser – 79 (AR)
- Switch-on-to-fault – SOTF
You can also add the following additional function packages to expand the functionality of your device:
- Line differential protection – 87L (IdL>)
- Voltage protection – 59N (U0>), 59 (U>), 27 (U<), 27T (LVRT), 47/27P/59PN (U1/U2>/<) 81O/81U (f>/<), 81R (df/dt>/<), 79N (U0 RECL), 25 (ΔV/Δa/Δf), 78 (Δφ), 24 (V/Hz)
- Directional protection – 32 (P,Q,S>/<), 67N/32N (I0dir>), 67 (Idir>), 67NT (IOint>), 59N (U0>)
- Distance protection – 21 (Z<), Load encroachment, Out-of-step/Power swing protection
- Power measurement – Power and energy measurement, ANSI 99 (programmable stages)
The generator protection application function package includes the following:
- Non-directional overcurrent – 50/51 (I>)
- Non-directional earth fault – 50N/51N (I0>)
- Directional overcurrent – 67 (Idir>)
- Directional earth fault – 67/32N (I0dir>)
- Negative sequence overcurrent; Phase current reversal; Current unbalance – 46/46R/46L (I2>)
- Harmonic overcurrent – 50H/51H/68H (Ih>)
- Circuit breaker failure protection – 50BF/52BF (CBFP)
- High- or low-impedance restricted earth fault; Cable end differential – 87N (I0d>)
- Generator thermal overload – 49M (TM>)
- Overvoltage – 59 (U>)
- Undervoltage – 27 (U<)
- Sequence voltage – 47/27P/59PN (U1/U2>/<)
- Low-voltage ride-through – 27T (LVRT)
- Over- and underfrequency – 81O/81U (f>/<)
- Rate-of-change of frequency – 81R (df/dt>/<)
- Power protection – 32 (P,Q,S>/<)
- Power factor protection – 55 (PF>)
- Underexcitation – 40 (Q<)
- Volts-per-hertz – 24 (V/Hz)
- 100% stator earth fault – 64S (U03rd>)
- Voltage-restrained overcurrent – 51V (Iv>)
- Underimpedance – 21U (Z<)
You can also add the following additional function packages to expand the functionality of your device:
- Synchronizer – 25 (ΔV/Δa/Δf)
- Machine differential protection – 87T/87G/87M/87N (Idx>)
The motor protection application function package includes the following:
- Non-directional overcurrent – 50/51 (I>)
- Non-directional earth fault – 50N/51N (I0>)
- Negative sequence overcurrent; Phase current reversal; Current unbalance – 46/46R/46L (I2>)
- Harmonic overcurrent – 50H/51H/68H (Ih>)
- Circuit breaker failure protection – 50BF/52BF (CBFP)
- High- or low-impedance restricted earth fault; Cable end differential – 87N (I0d>)
- Non-directional undercurrent – 37 (I<)
- Motor start, locked rotor monitoring – 48/14 (Ist>)
- Frequent start – 66 (N>)
- Mechanical jam – 51M (Im>)
- Motor thermal overload – 49M (TM>)
- Power factor protection – 55 (PF>)
You can also add the following additional function packages to expand the functionality of your device:
- Voltage protection – 59N (U0>), 59 (U>), 27 (U<), 27T (LVRT), 47/27P/59PN (U1/U2>/<) 81O/81U (f>/<), 81R (df/dt>/<), 79N (U0 RECL), 25 (ΔV/Δa/Δf), 78 (Δφ), 24 (V/Hz)
- Machine differential protection – 87T/87G/87M/87N (Idx>)
- Synchronous motor protection – 40 (Q<), 21U (Z<), 21/40 (X<), 51V (Iv>), 50/27 (I>U<I.A.E.), 37 (I<)
- Directional protection – 32 (P,Q,S>/<), 67N/32N (I0dir>), 67 (Idir>), 67NT (IOint>), 59N (U0>)
- Power measurement – Power and energy measurement, ANSI 99 (programmable stages)
The capacitor bank protection application function package includes the following:
- Non-directional overcurrent – 50/51 (I>)
- Non-directional earth fault – 50N/51N (I0>)
- Negative sequence overcurrent; Phase current reversal; Current unbalance – 46/46R/46L (I2>)
- Harmonic overcurrent – 50H/51H/68H (Ih>)
- Circuit breaker failure protection – 50BF/52BF (CBFP)
- High- or low-impedance restricted earth fault; Cable end differential – 87N (I0d>)
- Non-directional undercurrent – 37 (I<)
- Capacitor bank current unbalance – 46C (Iuc>)
- Capacitor bank neutral unbalance – 50UB (Cnu>)
- Capacitor bank overload – 49OL (Icol>)
You can also add the following additional function packages to expand the functionality of your device:
- Voltage protection – 59N (U0>), 59 (U>), 27 (U<), 27T (LVRT), 47/27P/59PN (U1/U2>/<) 81O/81U (f>/<), 81R (df/dt>/<), 79N (U0 RECL), 25 (ΔV/Δa/Δf), 78 (Δφ), 24 (V/Hz)
- Directional protection – 32 (P,Q,S>/<), 67N/32N (I0dir>), 67 (Idir>), 67NT (IOint>), 59N (U0>)
- Power measurement – Power and energy measurement, ANSI 99 (programmable stages)
- Power factor controller – 55 (PF>)
The voltage protection application function package includes the following:
- Overvoltage – 59 (U>)
- Undervoltage – 27 (U<)
- Neutral overvoltage – 59N (U0>)
- Low-voltage ride-through – 27T (LVRT)
- Sequence voltage – 47/27P/59PN (U1/U2>/<)
- Over- and underfrequency – 81O/81U (f>/<)
- Rate-of-change of frequency – 81R (df/dt>/<)
- Volts-per-hertz – 24 (V/Hz)
- Zero sequence recloser – 79N (U0> RECL)
- Synchrocheck – 25 (ΔV/Δa/Δf)
- Vector jump – 78 (Δφ)
You can also add the following additional function packages to expand the functionality of your device:
- Automatic voltage regulator – 90 (transformer AVR for up to four parallel transformers)
- Power measurement – Power and energy measurement, ANSI 99 (programmable stages)
The bay control application function package includes the following:
- Bay control
- Synchrocheck – 25 (ΔV/Δa/Δf)
- Auto-recloser – 79 (AR)
You can also add the following additional function package to expand the functionality of your device:
- Automatic voltage regulator – 90 (transformer AVR for up to four parallel transformers)
The alarm annunciator application function package includes the following:
- Alarm annunciation with up to 128 programmable alarm windows
Additional function packages
- Line differential protection – 87L (IdL>)
- Distance protection – 21 (Z<), ten stages
- Load enchroachment
- Out-of-step/Power swing protection
- Directional overcurrent – 67 (Idir>)
- Directional earth fault – 67/32N (I0dir>)
- Intermittent earth fault – 67NT (I0int>)
- Power protection – 32 (P,Q,S>/<)
- Neutral overvoltage – 59N (U0>)
- Machine differential protection – 87T/87G/87M/87N (Idx>)
- Underexcitation – 40 (Q<)
- Underimpedance – 21U (Z<)
- Underreactance – 21/40 (X<)
- Voltage-restrained overcurrent – 51V (Iv>)
- Inadvertent energizing – 50/27 (I>U<I.A.E.)
- Non-directional undercurrent – 37 (I<)
- Single-pole non-directional overcurrent protection – 50/51 (I>)
- 90 – Transformer AVR for up to four parallel transformers
- Power factor protection – 55 (PF>)
- Synchronizer – 25 (ΔV/Δa/Δf)
- Power and energy measurement
- Programmable stages – 99