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What is Auto Recloser (ACR)
2020-05-10 13:31:00 Copyfrom:www.cnrockwill.com view:2297

What is ACR Auto Recloser?

Auto recloser (ACR) ie. Automatic circuit recloser is recognized by electric utilities throughout the world as an essential device for achieving their prime goal: providing maximum continuity of electric service to their customers simply and economically. Reclosers sense and interrupt fault currents and automatically restore service after momentary outage.

Auto Recloser is an automatic medium voltage electric switch which is designed for use on overhead electricity distribution networks to detect and interrupt momentary faults. It shuts off electric power when trouble occurs, such as a short circuit. Where a household circuit breaker remains shut off until it is manually reset, a recloser automatically tests the electrical line to determine whether the trouble has been removed. And, if the problem was only temporary, the recloser automatically resets itself and restores the electric power.

On high-voltage electric lines, 80 to 90 percent of trouble occurrences are temporary –such as lightning, windblown tree branches or wires, birds, or rodents–and will, by their very nature, remove themselves from the electric line if the power is shut off before permanent damage occurs to the lines.
The recloser senses when trouble occurs and automatically shuts off the power. An instant later (the length of time may be noticeable only as a lightbulb flicker), the recloser turns the power back on, but if the trouble is still present, it shuts it off again. If the trouble is still present after three such tries, the recloser is programmed to consider the problem permanent and it remains off. A power company crew must then repair the problem on the line and reset the recloser to restore power.

The examples of permanent problems include: power lines or other equipment damaged by lightning strikes, fallen tree limbs, or vehicle crashes.

Reclosers save the electric companies considerable time and expense, since they permit power to be restored automatically, after only a flicker or two. And, for outages that require a repair crew, reclosers minimize the outage area and help the crews to quickly locate the problem and restore power. Consumers of electric power–residential, business, industrial, and institutional–are saved from the expense and inconvenience frequent power outages would cause.

The automatic circuit recloser is not simple comprised of a breaker + relay protection. There are many functions which no-standard recloser is not equipped with as following.


Rockwill Standard Economical Auto Recloser

Below video shows Auto recloser testing & setting!

https://youtu.be/REziIlJeJUU

Keywords: #Rockwill #Recloser #ACR #Switchgear #Smartgrid

The standard economical type auto recloser is also required to complied withas per IEEE/ANSI C37.60 or IEC62271-111 standard.

Rockwill's recloser gather multi relay protections like:

EF1/EF2

SEF1/SEF2

Cold Load Pickup

Live Load Blocking

Oscillography Capture capability

Programmable Logic

4 Independent Protection Groups

Advanced Automation

Harmonic Protection and Monitoring

Hot Line Tag Capability

Negative Phase Sequence Overcurrent

Inverse Time Protection

Live Line Function & Hot Line Tag Function

Definite Time Protection

Directional Sensitive ground Fault Protection

Two fast-two slow curves

Phase (OV1) & Line-to-Line (OV2) Over Voltage

Temporary Time Addition

Directional over current and ground fault protection

Voltage Protection Element

Phase under-voltage balanced element (UV1)

Logic program-able function

Phase-to-Phase Under-voltage Element (UV2)

Zone Sequence Co-ordination

Loss of Supply (UV3)

High set Instantaneous element

Voltage Sag Protection (UV4 Sag)

Power Quality monitoring including Systems Performance Indices, Voltage Sags and Swells

Voltage reclose control with automatic back feed(restoration provides loop automation functionality)


Part Number

RCW15M/630-20

RCW27M/630-20

RCW38M/630-20

Current Sensing

3 x Current Transformers

3 x Current Transformers

3 x Current Transformers

Voltage Sensing

3 x Voltage Sensors

3 x Voltage Sensors

3 x Voltage Sensors

Control Type

RWK-351

RWK-351

RWK-351

Even above specification required is not enough for standard auto recloser, there is so many addtional logic.


What is the different between Auto Sectionalizer and Auto recloser?

Many people are confused with what is the different between auto recloser and Auto Sectionalizer. Basically say, The auto recloser is a heavey duty long life application switchgear, and the auto sectionalizer is a coordination subordination light duty switchgear. As a simple logic, that normal service recloser frequent switching on and off by several times according to setting which is programed until at a count number then finally Auto sectionalizer drive one operation only.

More details different about Auorecloser and Auto Sectionalizer, Please check the link:

Technical---: https://www.cnrockwill.com/article/A-traditional-distribution-automation-under-coordination-by-recloser-plus-sectionalizer.html

About auto sectionalizer, you have to take notice of Automatic "Auto", Present now some engineer still dont know why there is a disconnector switch using by somehow sometime reason that the designer give difinition as sectionalizer but it is actual a manula operation disconnector. What reason? Because of budget? Because of old technology, it was no auto sectionalizer technology long time ago.

So, be clear about what is auto sectionalizer? check the below link:

Auto Sectionalizer---: https://www.cnrockwill.com/automatic-sectionalizer.html

There are two type auto sectioanlizer, One is Off load type another is on oad type auto sectionalizer.


How to choose a recloser for your power?

There are so many different special required functions or feature or configurations. Rockwill provides with different type reclosers to worldwide customers according to its speciified specification or standard.


1, If you want a recloser only like to use as a circuit breaker + relay protection. Pls go to choose below link china standard auto recloser:

https://www.cnrockwill.com/article/china-standard-auto-recloser.html

2, For key section power supply application recloser, please choose:

https://www.cnrockwill.com/article/auto-recloser-with-manual-closing.html

3,For IEC/ANSI standard distribution line feeder auto recloser, Please choose:

https://www.cnrockwill.com/article/recloser.html

4,For bus-tie or generation export on grid guard, please choose:

https://www.cnrockwill.com/article/rockwill-standard-recloser.html

5,For single phase auto recloser, please choose:

https://www.cnrockwill.com/article/single-phase-recloser.html

6,For further special function auto recloser, please consult with our team!


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Tel: 0086-577-27869969

Email: barry@rockwill.cn

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