Rockwill Electric Group
Auto Recloser with SCADA
Reclosers are small circuit breakers located at the top of distribution poles and are very popular and key switchgear in distribution network. ...

Detailed description

  • Description
  • Recloser for Substation Automation Application
  • Recloser feature
  • More application recloser

Reclosers are small circuit breakers located at the top of distribution poles and are typically used on very long distribution feeders. Their function is to isolate a section of the feeder in fault or overload conditions and thereby minimize the number of customers without service. Since they act as small circuit breakers, they have the capability to restore power automatically in temporary fault situations, hence the name "recloser".

To further reduce the number of customers taken out of service in a fault condition, reclosers are "coordinated" with downstream fused cutouts and upstream substation circuit breakers. For example, let's say a tree branch falls across a tapped single phase line in a residential community. Without a recloser between the fused cutout serving the tapped single phase line and the substation circuit breaker, the entire feeder would be affected. With a recloser present, only that portion of the feeder downstream from it would be affected. Now, the recloser would operate (or open) and then reclose almost instantaneously. If the fault (tree branch on the line) is still present, the recloser would open again. This time it may be pre-set to wait a second or two before reclosing. After reclosing, if the fault is still there and the fused cutout didn't blow during the last operation, the recloser would hold for a short while to give the fused cutout time to blow and isolate just the tapped single phase line. If it doesn't for some reason, the recloser would open a third time and "lockout". At this point a lineman must be dispatched to inspect the problem and reclose the recloser manually.

Rockwill Electric strives to bring our customers the latest technology and competitive pricing and best service for distribution automation.

The RCW series automatic circuit reclosers can use on overhead distribution lines as well as distribution substation applications for all voltage classes 11kV up to 38kV at 50/60HZ power system. and its rated current can reach 1250A.

The RCW series automatic circuit reclosers integrates the functions of control, protection, measurement, communication, fault detection, on-line monitoring of closing or opening.

The main difference between RCW38M and RCW38N

Type Close energy Open energy Mechanical life
RCW27M By capacitor charging, fast within 1 S Need By capacitor release More than 60,000 times
RCW27N By motor charging spring, long time 7S~15S No need capacitor 10,000 times

T to T*   -----Terminal to terminal creepage

T to G/E* -----Terminal to ground/earth creepage

The Rockwill Electric recloser can also be used as feeder protection in a new substation or replace existing switches.

The compact size, excellent switching capability, convenient busbar connection points as well as an optional substation frame stand of the RCW are will suited to simplify the substation design.

The rating current of substation type recloser up to 1250A, Breaking capacity up to 25kA.


With optional classes for rated current range:

For 12kV, with630A, 20kA Breaking capacity. 800A, 20kA capacity, and1250A, 25kA.

For 15kV, with630A, 20kA Breaking capacity. 800A, 20kA capacity, and1250A, 20kA.

For 27kV, with630A, 20kA Breaking capacity.800A, 16kA capacity, and1250A, 25kA.

For 38kV, with630A, 20kA,. and expanding1250A, .25kA RCW38M type..

With optional classes for installation styles:

Single phase, vacuum recloser and Three phase, vacuum recloser.

With optional relay protection curves for user choice:


Ph.OC1: Current Protection

Ph.OC2: limit current protection

Ph.OC3: over-current protection

IDMTOC: inverse-time overcurrent protection

SEF: Sensitive earthing fault overcurrent protection

Reclose: reclosing

Recl.ACC: Inter-phase Closing acceleration protection

Manu.ACC: Inter-phase charging protection

Overload: Overload protection

NSPTOC1: some Inter-phase negative sequence overcurrent

NSPTOC2: Inter-phase negative sequence overcurrent protection, Sec.

PH.OV: over-voltage protection

PH.UV: Low voltage protection

Resi.OV: zero sequence overvoltage protection

Hi.Gas: heavy gas protection

Hi.Temp: High temperature protection

Com.Val: common values


More relay functions can be customized.

With optional choice by locally or remotely.

With optional communication protocols & I/O port for user choice:

RS-232 and RS-485 ports supporting.

DNP3.0 communication protocol support(*).

Modbus communication protocol is optional(*).

IEC 60870-5-101 communication protocol support.

IEC 60870-5-104 communication protocol support. (*).

The recloser can communicate through GPRS(Or GSM) modem with English or Chinese languege (*).With optional functions for user.

Rated currents, System phase current.

Rated voltages, System phase voltage& secondary low voltage power supply voltage.

Frenquency, power(kWh), reactive power(kVarh),power factor .

With optional reclosing interval for user pre-program:

Reclosing times setting support.

Dead time setting support.

With events recording function:

SOE 1000 operations record.

Fault record and normal operation record.

Note: (*) mean should customized by manufacturer if needed.

· Outline of recloser:

The RCW series vacuum recloser is mainly combined with integration terminal, current transformer, permanent magnetic actuator and its recloser controller.

· The recloser tank feature:

The Vacuum recloser tanks are manufactured from 304 grade stainless steel and are powder coated a light grey colour.Whole recloser IP65 protection class, equipped with a auxiliary plug to connect with recloser controller by control cable, Diameter Max22mm,6 Mlength(8Mfor special). It can serve more than 20 years long term under heavy duty circumstance.

· The recloser vacuum embedded pole feature:

The recloser’s vacuum interrupter insert in an epoxy resin solid pole, and external coated with a high reliable, stable material:Fluorocarbon silicone rubber (γ-trifluoro propyl methyl polysiloxane)

With excellent electric insulation, weather resistance, ozone, biological inertia, can be stand under the long-term use in -55 ~ +200℃.

Creepage Distances of RCW

15kV BIL 95/110kV
15kV BIL 125kV
27kV BIL 125kV
27kV BIL 150kV
38kV BIL 170/185kV
T to T*
T to G/E*

Radial line recloser

When a recloser is installed on a radial feeder it automatically clears transient faults and isolates permanent faults. More than one recloser can be installed on a feeder to isolate faults selectively and ensure fewer customers are affected.

Loop recloser

A loop recloser further improves the reliability of a power supply by automatically reconfiguring a network in the event of a failure.

Bus couple recloser

A Rockwill Recloser can be used as a bus tie breaker in a grid.

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