Year: 2025

The RET670 also features pole slip protection, which detects and evaluates pole slips occurring in the

power system and takes the necessary action.

Sections of the power system that are swinging away from each other can be separated by

the line closest to the center of the power swing, allowing the two systems to remain stable when

separated.

The RET670 can be used with the IEC 61850-9-2LE process bus with up to six Merge Units (MUs).

Advanced logic functions allow user logic to be programmed with graphical tools to enable special

applications such as automatic opening of disconnect switches in multi-breaker arrangements, closing of

breaker loops and load transfer logic.

Logic can be monitored and debugged online in real time for testing and commissioning.

Communication via fiber optic connections ensures immunity to interference.

Six software packages are defined for the following applications:

– Transformer backup protection (A10)

– Voltage control (A25)

– Single-breaker, two-winding transformers (A30)

– Double-winding transformers with multiple circuit-breaker arrangement (B30)

– Three-winding transformers in single-breaker arrangement (A40)

– Triple-winding transformer in multi-breaker arrangement (B40)

The optional functions are not configured, but a maximum configuration with all optional

functions is available as a template in the graphical configuration tool.

Templates for alternative configurations for auto-transformers are also available.

The analog and trip I/O are pre-defined for basic use and come standard with one binary input module

and one binary output module.

The binary I/O can be added at the time of ordering, depending on the needs of the application.

the other signals need to be set up according to the needs of the different applications.

Trip and alarm signals from the pressure relief, Buchholz and temperature devices can be

sent directly to the RET670 via the binary input channels for alarm and standby.

The binary inputs are highly stable against interference and prevent incorrect operation due to,

for example, capacitive discharges in the DC system or DC ground faults.

The distance protection function serves as backup protection against faults within the transformer and in

the connected power system.

Positive-, negative- and zero-sequence overcurrent functions (selectable direction and/or voltage control)

provide further back-up protection.

Thermal overload, overexcitation, overvoltage/undervoltage and overfrequency/underfrequency

protection functions are also provided.

A circuit breaker fault protection function for each transformer circuit breaker allows high-speed backup

tripping of surrounding circuit breakers.

A built-in disturbance and event recorder provides the user with valuable data on status and operation

for post-fault disturbance analysis.

The RET670 can also be optionally equipped with a full range of control and interlocking features,

including a synchronization check function for integration of primary or local standby control functions.

The wide application flexibility makes this product

an excellent choice for both new installations and

the refurbishment of existing installations.

Six packages have been defined for the following

applications:

• Transformer back-up protection (A10)

• Voltage control (A25)

• Two-winding transformer in single breaker

arrangements (A30)

•Two-winding transformer in multi breaker

arrangements (B30)

•Three-winding transformer in single breaker

arrangements (A40)

•Three-winding transformer in multi breaker

arrangements (B40)

Optional functions are not configured but a

maximum configuration with all optional functions

are available as template in the graphical

configuration tool. An alternative for

Autotransformers is also available as a

configuration template. Analog and tripping IO

has been pre-defined for basic use on the, as

standard supplied one binary input module and

one binary output module. Add binary I/O as

required for your application at ordering. Other

signals need to be applied as required for each application.

Application

Versatile phase, earth, positive and zero sequence overcurrent functions, which can

optionally be made directional and/or voltage controlled, provide further alternative backup

protection. Thermal overload with two time constants, volts per hertz, over/under voltage and

over/under frequency protection functions are also available.

A built-in disturbance and event recorder provides valuable data to the user about status and

operation for post-fault disturbance analysis. Breaker failure protection for each transformer

breaker allows high speed back-up tripping of surrounding breakers.

The transformer IED can also be provided with a full control and interlocking functionality including

Synchrocheck function to allow integration of the main and/or a local back-up control.

Out of Step function is available to separate power system sections close to electrical centre

at occurring out of step.

The advanced logic capability, where user logic is prepared with a graphical tool, allows special

applications such as automatic opening of disconnectors in multi-breaker arrangements,

closing of breaker rings, load transfer logic and soon. The graphical configuration tool ensures

simple and fast testing and commissioning.

Serial data communication is via optical connections to ensure immunity against disturbances.

Application

The differential function offers a high sensitivity for

low-level internal faults. The unique and innovative

sensitive differential protection feature of the

RET670 provides the best possible coverage for

winding internal turn-to-turn faults, based on well

known theory of symmetrical components .

Low impedance restricted earth-fault protection

functions are available as complimentary sensitive

and fast main protection against winding earth

faults. This function includes a directional zero

sequence current criterion for additional security.

Additionally a high impedance differential function

is available.

It can be used as restricted earth

fault or, as three functions are included, also as

differential protection on autotransformers, as

differential protection for a tertiary connected

reactor, as T-differential protection for the

transformer feeder in a mesh-corner or ring

arrangement, as tertiary bus protection and so on.

Tripping from Pressure relief/Buchholz and

temperature devices can be done through the

transformer IED where pulsing, lock-out contact

output and so on, is performed. The binary inputs

are heavily stabilized against disturbance to

prevent incorrect operations at for example, dc

system capacitive discharges or DC earth faults.

Distance protection functionality for phase-to

phase and/or phase-to-earth faults is available as

back-up protection for faults within the

transformer and in the connected power system.

Application

RET670 provides fast and selective protection,

monitoring and control for two- and three-winding

transformers, autotransformers, generator

transformer units and shunt reactors. The

transformer IED is designed to operate correctly

over a wide frequency range in order to

accommodate power system frequency variations

during disturbances and generator start-up and shut-down.

A very fast differential protection function, with

automatic CT ratio matching and vector group

compensation, makes this IED the ideal solution

even for the most demanding applications. Since

RET670 has very low requirements on the main

CTs, no interposing CTs are required.

It is suitable for differential applications with multi-breaker

arrangements with up to six restraint CT inputs.

The differential protection function is provided

with 2nd harmonic and wave-block restraint

features to avoid tripping for magnetizing inrush

current, and 5th harmonic restraint to avoid tripping for overexcitation.

Easiness with the built-in EMC C2 filter

High-frequency noise can directly affect sensitive electronic equipment and

high-speed communication fieldbuses. Each ACS480 drive is equipped with

a built-in EMC filter to reduce high-frequency emissions. The built-in EMC C2

filter allows the drive to be used in industrial and commercial (building)

environments without a need to buy and install any external filters.

Boosting energy efficiency

Energy efficiency information is available in the energy optimizer feature to help

you optimize your processes. The energy optimizer feature operates both in scalar

and vector control modes, ensuring maximum torque per ampere and reducing

energy drawn from the supply. You can follow the saved energy, CO₂ emissions

or money, and see how fast the drive brings you a return on investment.

Easiness with built-in brake chopper

A brake chopper is built-in as standard for all the ACS480 drives. The brake

chopper enables shorter and more accurate braking times, which instantly

increases productivity.

Easiness with the built-in EMC C2 filter

High-frequency noise can directly affect sensitive electronic equipment and

high-speed communication fieldbuses. Each ACS480 drive is equipped with

a built-in EMC filter to reduce high-frequency emissions. The built-in EMC C2

filter allows the drive to be used in industrial and commercial (building)

environments without a need to buy and install any external filters.

Boosting energy efficiency

Energy efficiency information is available in the energy optimizer feature to help

you optimize your processes. The energy optimizer feature operates both in scalar

and vector control modes, ensuring maximum torque per ampere and reducing

energy drawn from the supply. You can follow the saved energy, CO₂ emissions

or money, and see how fast the drive brings you a return on investment.

Instant availability

ACS480 products are available from central stocks around

the world for immediate delivery. The product is also

widely available from ABB distributors.

Maximum reliability

Design features like coated circuit boards, minimized

airflow through the control board section, earth fault

protection and design for 50 °C ambient temperature make

the ACS480 a safe choice. These features prolong the

lifetime of the drives and protect your applications from

unexpected downtimes. In addition, all the units are

tested during production in maximum temperature with

nominal loads.

Leverage the compact design of the ACS480 for a cost-effective and efficient solution.

The cabinet optimized design with built-in features and control functions provide you

with streamlined process automation and efficiency to improve your bottom line.