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AUTOMATIC CIRCUITAUTOMATIC CIRCUITRECLOSERRECLOSER

Shereena sShereena s

S5 EEE :24S5 EEE :24

GPTC attingalGPTC attingal

AUTOMATIC AUTOMATIC CIRCUITCIRCUIT

RECLOSERRECLOSER

AUTOMATIC AUTOMATIC CIRCUITCIRCUIT

RECLOSERRECLOSER

INTRODUCTIONINTRODUCTION

Automatic circuit recloser is essentially a self Automatic circuit recloser is essentially a self contained device, which sense over currents to contained device, which sense over currents to time and interrupt fault currents and to time and interrupt fault currents and to reenergize the line by reclosing automatically.reenergize the line by reclosing automatically.

If fault is If fault is permanent permanent ,recloser locks open after a ,recloser locks open after a preset no. of operations, isolating the faulted preset no. of operations, isolating the faulted section from main part of the system.section from main part of the system.

Temporary faultsTemporary faults

Tree branches touching energized linesTree branches touching energized lines

Lightning surges flashing over an insulatorLightning surges flashing over an insulator

Birds ,reptiles bridging between an Birds ,reptiles bridging between an energized line and a grounded surface.energized line and a grounded surface.

Windblown conductors touching one Windblown conductors touching one another.another.

Recloser classifying featuresRecloser classifying features

Single phase or three phase.Single phase or three phase.

Interrupters:oil or vacuum.Interrupters:oil or vacuum.

Insulation:oil,air or epoxy.Insulation:oil,air or epoxy.

In three phaseIn three phase (1)triple single tripping(1)triple single tripping (2)three phase tripping(2)three phase tripping

Interrupting mediumInterrupting medium

Oil interrupters:Oil interrupters: recloser with hydraulic recloser with hydraulic control use this interrupters.control use this interrupters.

Vacuum interruptersVacuum interrupters:: it provide fast, low it provide fast, low energy arc interruption with long contact energy arc interruption with long contact and interrupter lifeand interrupter life It is designed with a metal and ceramic It is designed with a metal and ceramic

housing for maximum strength.housing for maximum strength. Contact and interrupter life is larger than other Contact and interrupter life is larger than other

interrupting medium .interrupting medium .

LEGEND1.X side terminal2.Vacuum interrupter3.Epoxy bushing4.Earthing point5.Stainless steel tank6.Magnetic actuator7.Scem card8.Control cable9.Manual trip ring10.Pointer11.Lightning arrester brackets12.Stainless steel lid13.Current transformer14.Capacitive voltage transformer15.I-side terminal

Recloser overview and operationRecloser overview and operation

Monitoring and control of the recloser is performed by Monitoring and control of the recloser is performed by PTCC, PTCC, which is located lower down the pole.which is located lower down the pole.

It houses the It houses the operator control paneloperator control panel and and microelectronics that provide the protection functionsmicroelectronics that provide the protection functions

It is connected to recloser by a detachable It is connected to recloser by a detachable control control cablecable

Remotely controlled and monitored Remotely controlled and monitored ACRACR

Recloser is operated by a magnetic actuators.Recloser is operated by a magnetic actuators.

PTTCPTTC requires an auxiliary ac supply requires an auxiliary ac supply

SCEM SCEM usesuses EEPROM EEPROM memory to store all relevant memory to store all relevant calibration data.calibration data.

To short the CTs and CVTs in the event the control To short the CTs and CVTs in the event the control cable is disconnected while current is flowing cable is disconnected while current is flowing through the recloser through the recloser

Controlling part of the recloserControlling part of the recloser

Internal equipment control panel used to mount all Internal equipment control panel used to mount all equipmentequipment

Weather access provided to the operator control Weather access provided to the operator control panel through a lockable door on the front of the panel through a lockable door on the front of the cubiclecubicle

3 models of control and communication cubicle3 models of control and communication cubicle

1. Tropical- ventilated, 50 dgre;1. Tropical- ventilated, 50 dgre;

2. Moderate- reduce ventillation;40dgre C2. Moderate- reduce ventillation;40dgre C

3. Temperate- heater installed;40 dgre C3. Temperate- heater installed;40 dgre C

It incorporate the function of overcurrent protection It incorporate the function of overcurrent protection relay,sensitive earth fault relay,reclose relay and a relay,sensitive earth fault relay,reclose relay and a RTU.RTU.

Recloser is built in micro processor controlled power Recloser is built in micro processor controlled power supplysupply

CB operation is independent of the high voltage CB operation is independent of the high voltage supplysupply

VV2323 FSK Modem FSK Modem

Block diagram of recloser workingBlock diagram of recloser working

Three level of user interface with operator Three level of user interface with operator control panelcontrol panel Operator levelOperator level Technician levelTechnician level Engineer levelEngineer level

Operator level

allow basic operation like trip ,close and display settings

protector settings and fault history

line measurements

Recloser functions

Computer interfaceComputer interface

The The WSOS WSOS is an advanced personal is an advanced personal computer based software package to allow computer based software package to allow off-line and on-line programming, monitoring off-line and on-line programming, monitoring and control of a recloser .and control of a recloser .

Recloser applicationRecloser application

Location for recloser are:Location for recloser are:in substations as the primary feeder protective in substations as the primary feeder protective devicedevice

On distribution lines at a distance from a On distribution lines at a distance from a substation, to sectionalize long feeders and thus substation, to sectionalize long feeders and thus prevent outages of the entire feeder when a prevent outages of the entire feeder when a permanent fault occurs near the end of the feederpermanent fault occurs near the end of the feeder

On important taps of main feeders to protect the On important taps of main feeders to protect the main feeder from interruptions and outages due to main feeder from interruptions and outages due to faults on the taps.faults on the taps.

Factors affecting recloserFactors affecting recloser

system voltagesystem voltage

maximum fault current available at the maximum fault current available at the point of recloser locationpoint of recloser location

Maximum load currentMaximum load current

Minimum fault current Minimum fault current

Advantages of automatic circuit Advantages of automatic circuit recloserrecloser

Reduced purchase costReduced purchase cost

Reduced installation costReduced installation cost

Reduced operating cost Reduced operating cost

Improved environmental aspectsImproved environmental aspects

Increased revenueIncreased revenue

DisadvantagesDisadvantages

Wiring connectors or recloser are requiredWiring connectors or recloser are required

Lightning arrestor are to be mountingLightning arrestor are to be mounting

Scope for future workScope for future work

ConclusionConclusion

ReferenceReference

www.seminar.comwww.seminar.com

www.edocfind.comwww.edocfind.com

www.pvelectro.comwww.pvelectro.com

QuestionsQuestions