Recloser information

In electric power distribution, automatic circuit reclosers (ACRs) are a class of switchgear designed for use on overhead electricity distribution networks to detect and interrupt transient faults. Also known as reclosers or autoreclosers, ACRs are essentially rated circuit breakers with integrated current and voltage sensors and a protection relay, optimized for use as a protection asset. Commercial ACRs are governed by the IEC 62271-111/IEEE Std C37.60 and IEC 62271-200 standards.^[1]^[2] The three major classes of operating maximum voltage are 15.5 kV, 27 kV and 38 kV.

For overhead electric power distribution networks, up to 80% of faults are transient, such as lightning strike, surges or foreign objects coming into contact with exposed distribution lines. Consequently, these transient faults can be resolved by a simple reclose operation.^[3] Reclosers are designed to handle a brief open-close duty cycle, where electrical engineers can optionally configure the number and timing of attempted close operations prior to transitioning to a lockout stage.^[4] The number of reclose attempts is limited to a maximum of four by recloser standards noted above.

At two multiples of the rated current, the recloser's rapid trip curve can cause a trip (off circuit) in as little as 1.5 cycles (or 30 milliseconds). During those 1.5 cycles, other separate circuits can see voltage dips or blinks until the affected circuit opens to stop the fault current. Automatically closing the breaker after it has tripped and stayed open for a brief amount of time, usually after 1 to 5 seconds, is a standard procedure.^[5]

Reclosers are often used as a key component in a smart grid, as they are effectively computer controlled switchgear which can be remotely operated and interrogated using supervisory control and data acquisition (SCADA) or other communications. Interrogation and remote operation capabilities allow utilities to aggregate data about their network performance, and develop automation schemes for power restoration. Automation schemes can either be distributed (executed at the remote recloser level) or centralized (close and open commands issued by a central utility control room to be executed by remotely controlled ACRs).

^ "IEC 62271-111:2019 Automatic circuit reclosers for alternating current systems up to and including 38 kV". webstore.iec.ch. Retrieved 25 June 2022.
^ IEC/IEEE International Standard - High-voltage switchgear and controlgear - Part 111: Automatic circuit reclosers for alternating current systems up to and including 38 kV. February 2019. pp. 1–272. doi:10.1109/IEEESTD.2019.8641507. ISBN 978-2-8322-4991-8. Retrieved 25 June 2022. {{cite book}}: |journal= ignored (help)
^ B. M. Weedy (1972), Electric Power Systems (Second ed.), London: John Wiley and Sons, p. 26, ISBN 978-0-471-92445-6
^ Thompson, Stan. "Auto-Recloser - Safety and Minimising Downtime". Transmission & Distribution Issue 1 2018. Retrieved 2018-07-02.
^ Jeremy Blair, Greg Hathway, and Trevor Mattson of Schweitzer Engineering Laboratories, Inc. "Solutions to Common Distribution Protection Challenges".{{cite web}}: CS1 maint: multiple names: authors list (link)

[1] "IEC 62271-111:2019 Automatic circuit reclosers for alternating current systems up to and including 38 kV". webstore.iec.ch. Retrieved 25 June 2022.

[2] IEC/IEEE International Standard - High-voltage switchgear and controlgear - Part 111: Automatic circuit reclosers for alternating current systems up to and including 38 kV. February 2019. pp. 1–272. doi:10.1109/IEEESTD.2019.8641507. ISBN 978-2-8322-4991-8. Retrieved 25 June 2022. {{cite book}}: |journal= ignored (help)

[3] B. M. Weedy (1972), Electric Power Systems (Second ed.), London: John Wiley and Sons, p. 26, ISBN 978-0-471-92445-6

[4] Thompson, Stan. "Auto-Recloser - Safety and Minimising Downtime". Transmission & Distribution Issue 1 2018. Retrieved 2018-07-02.

[5] Jeremy Blair, Greg Hathway, and Trevor Mattson of Schweitzer Engineering Laboratories, Inc. "Solutions to Common Distribution Protection Challenges".{{cite web}}: CS1 maint: multiple names: authors list (link)

Recloser information

and 24 Related for: Recloser information

Recloser

Intelligent electronic device

Electric power conversion

Busbar

Power station

Electrical substation

Electronic component

Electrical grid

Hydraulic machinery

HVDC converter station

Circuit breaker

Power engineering

Electric power system

Rectifier

Electricity generation

Voltage converter

Interconnector

Power inverter

Photovoltaic system

Islanding

Energy storage

Industrial internet of things

Hubbell Incorporated

Demand response