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    Auto Reclosers

    Uploaded by

    Singam Sridhar
    1) Autorecloser relays are implemented in electric utility overhead lines to improve power availability and maintain system stability, but on-site testing is required before operation to ensure proper functionality. 2) Numerical autorecloser relays integrate autorecloser functionality into a single multifunction relay module, reducing wiring and elements to test on site compared to older multi-element designs. 3) However, on-site testing of numerical autoreclosers depends more heavily on manufacturer guidance and specialized test equipment compared to older multi-element autorecloser designs.

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    Auto Reclosers

    Uploaded by

    Singam Sridhar
    491 views23 pages
    1) Autorecloser relays are implemented in electric utility overhead lines to improve power availability and maintain system stability, but on-site testing is required before operation to ensure proper functionality. 2) Numerical autorecloser relays integrate autorecloser functionality into a single multifunction relay module, reducing wiring and elements to test on site compared to older multi-element designs. 3) However, on-site testing of numerical autoreclosers depends more heavily on manufacturer guidance and specialized test equipment compared to older multi-element autorecloser designs.

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    on site testinf auto reclosers

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    auto reclosers

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    1) Autorecloser relays are implemented in electric utility overhead lines to improve power availability and maintain system stability, but on-site testing is required before operation to ensure proper functionality. 2) Numerical autorecloser relays integrate autorecloser functionality into a single multifunction relay module, reducing wiring and elements to test on site compared to older multi-element designs. 3) However, on-site testing of numerical autoreclosers depends more heavily on manufacturer guidance and specialized test equipment compared to older multi-element autorecloser designs.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    491 views23 pages

    Auto Reclosers

    Uploaded by

    Singam Sridhar
    1) Autorecloser relays are implemented in electric utility overhead lines to improve power availability and maintain system stability, but on-site testing is required before operation to ensure proper functionality. 2) Numerical autorecloser relays integrate autorecloser functionality into a single multifunction relay module, reducing wiring and elements to test on site compared to older multi-element designs. 3) However, on-site testing of numerical autoreclosers depends more heavily on manufacturer guidance and specialized test equipment compared to older multi-element autorecloser designs.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
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    The key takeaways are that autoreclosers are used in overhead power lines to improve power availability and system stability by automatically reclosing circuit breakers after temporary faults. Site testing of autoreclosers is important to ensure proper function before operation.

    Single module autoreclosers have fewer elements to test on site but a defective element may affect the whole function. Multi-element autoreclosers allow easier detection and repair of problems but have more elements to test. Single module autoreclosers generally have lower power consumption and site wiring to test.

    Modern single module autoreclosers require more specialized test equipment and knowledge of manufacturer manuals for site testing. Problems are harder to detect visually. Multi-element autoreclosers allow easier site testing with simpler equipment.

    ON SITE TESTING OF AUTO RECLOSER RELAYS

    B.VENU (09C31A0206)

    Numerical Current Relay & Auto Recloser (JNC268)

    Introduction

    Autorecloser relays are widely implemented in the electric utilities Over Head Lines networks to improve power availability and to maintain system stability. Site testing need to be performed before operation to ensure proper function of Autoreclosers. There is not much manufacturer guidance in functional site testing of Autoreclosers. Therefore, testing engineers have to carry out the functional site tests according to specific requirements of the installations. Application of multifunction and numerical relays has reduced the number of elements and wirings to be tested on site, but it would not eliminate the requirement to perform site testing.

    Numerical Current Relay & Auto Recloser


    We are engaged in offering Numerical Current Relay & Auto Recloser. FEATURES Suitable for 1A / 5 A relay rating Choice of 5 IDMT curve and definite time Programmable Over current relay or Over current relay with multi shot auto re-close Trip test facility History of 6 latest faults Self supervision facility Independent trip sequence setting (IDMT / Def. time) Breaker status monitoring Disturbance records (DR) in IEEE COMTRADE format Event Records ( ER) MODBUS open protocol over RS - 485 port MODBUS protocol over RS - 232 port

    Draw out facility with inbuilt CT shorting Standard dimension - 144mm x 144mm

    PRINCIPLE OF OPERATION The relay measures the line current from each of the phases and if it exceeds the set threshold, then relay extends a trip signal after an operating time. The relay's operating time is determined by selecting definite time OR one of the five inverse time characteristics. Multi shot auto-re-closer facilitates automation related to closing of a breaker. Auto re-closer functionality can be programmed to provide a maximum of five shots. Dead time starts only when phase or earth fault trip occurs. After an elapse of a time interval equal to dead time, closing command will be extended. The reclaim time timer starts at the instant the dead time timer expires. If, after extending the "breaker close" signal an over current fault was detected before the reclaim time timer reached its terminal count, then the relay understands that the fault in the system is still persisting and the over current relay will issue a trip signal. The relay tries to close the breaker for a maximum of the programmed number of shots before it choses to lockout.

    TECHNICAL DATA RATINGS Current rating ( In ) 1A/5A( Site selectable)

    Aux. Supply

    20 to 60V DC 80 to 260V AC / DC

    An Over head line with Auto recloser relays

    1. A temporary fault occur 2. Protective relays operate Utility Substation breaker tripped Customers Power off

    1. Fault extinguished 2. Autorecloser relays order the breaker to reclose Breaker reclose Power is restored automatically

    An Over head line without Auto recloser relays

    1. A temporary fault occur 2. Protective relays operate Utility Substation breaker tripped Customers Power off 1. Fault extinguished 2. Breaker need to be closed manually to restore power

    TYPICAL CONFIGURATION & SETTING of AUTORECLOSER RELAY in INDONESIA

    TYPICAL CONFIGURATION & SETTING of AUTORECLOSER RELAY in INDONESIA


    500kV
    Dead Time Setting Reclaim Time Setting Number of shots Single or Multi Pole 0.7 or 0.9 second 40 second single shot single pole Number of Breakers Protective relay two Distance Relay

    275kV

    150kV
    1 second 40 second single shot single and three poles One two (for One & Half Breaker S/S) Distance Relay

    20kV
    60 second 180 second single shot three poles

    one Over Current

    Riam A. Wibowo

    Basic Requirement of Autorecloser Relay Performance


    The Autorecloser Relay should reclose the Breaker(s) whenever it is initiated by Protective Relay

    The Autorecloser Relay should not reclose the Breaker(s) if the initiation occurs during the Reclaim Time

    For single pole mode, the Autorecloser Relay should only reclose the Breaker(s) for single phase to earth fault. The Autorecloser Relay should never reclose the Breaker(s) if : no initiation from Protective Relay (e.g. when the Breaker(s) are intentionally opened by people) Any of the Breaker(s) is not ready 6

    Basic Requirement of Autorecloser Relay Performance (2)

    For single and three poles mode : The Autorecloser Relay should reclose the Breaker(s) for line-line fault under control of synchrocheck relay The Autorecloser Relay should reclose the Breaker(s) for single phase to earth fault

    Three poles reclosing should be under Synchro Check control (except for 20kV radial networks)

    Failure of reclosing after single pole tripping should be followed by tripping of all poles

    Specific requirement for 500 kV Autorecloser Relay

    The Autorecloser Relay should reclose the Breaker(s) when initiated by any Distance Relay (due to duplex configuration of 500 kV protection scheme)

    Since 500kV Substations are one & half breaker type, the Autorecloser Relay should be able to recognize and control each of the Breaker as leader Breaker and follower Breaker

    TYPICAL SITE TESTS ITEMS OF AUTORECLOSER RELAY


    Visual Check

    INSTALLATION Check of the Power Supply

    Test of the Autorecloser settings

    OPERATION Functional Testing (involving operation of Protective Relays & Circuit Breaker(s) 9

    Protective Relay technology development

    Electro mechanical

    Electronic

    Digital/numerical

    Multi elements Relays

    Single Module Relays

    Multifunction Relays

    10

    11

    Multi elements Autorecloser (Previous Generation of Autorecloser )


    Autorecloser Timer(s) & Counters Synchro Check relay Power Supply

    An Autorecloser consist of several electro mechanic/ electronic elements that hard wired to form Autorecloser function

    Logic Circuit

    Aux. Relays & contacts Protective relay


    Riam A. Wibowo

    CIRCUIT BREAKER(S)

    16

    Multi elementsAutorecloser (Previous Generation ofAutorecloser )


    Autorecloser Timer(s) & Counters Synchro Check relay Power Supply

    An Autorecloser consist of several electro mechanic/ electronic elements that hard wired to form Autorecloser function

    Logic Circuit

    Aux. Relays & contacts Protective relay


    Riam A. W ibowo

    CIRCUIT BREAKER(S)

    16

    Current Generation of Autorecloser


    Autorecloser function is integrated in a multifunction relay

    Autorecloser
    Synch Check

    CIRCUIT BREAKER(S)

    Protective .relay

    Riam A. Wibowo

    18

    Effect of relay technology development to Autorecloser site testing:


    Type of Advantage Autorecloser Disadvantage

    detected Single modulo (Single type of Autorecloser electronic module perform Autorecloser function) Site wiring to be tested are less than the multi elements Autorecloser Often, relay type of power the whole Autorecloser. Elements on site are less than the multi elements elements Defective to be tested inspection

    Only few problems can be early by visual

    Autorecloser might functions and effecting of usually

    can not be repaired on site The site test is depend on the manufacturer. The test engineers need to study

    consumption is lower,

    Manufacturer perform the site test

    Manuals

    to

    Effect of relay technology development to Autorecloser site testing


    Type of Autorecloser Advantage Disadvantage

    Multi elements (Several electro mechanic /electronic elements hard wired to perform Autorecloser function)

    Many problems can be detected early by visual inspection In most cases, defective in Autorecloser element can be repaired on site and replacements can be obtained in local market . The function of other elements are not effected by failure of an element . The site test engineers are less dependent on the manufacturer . Often, experienced engineers could perform the site test without reading the Manufacturer Manuals Site test can be performed using simple relay test set
    Riam A. Wibowo

    Many elements need to to be tested on site Many site wiring need to be tested

    11

    Effect of relay technology development toAutorecloser site testing


    Type of Advantage Autorecloser Disadvantage

    Elements

    to be visual inspection It is difficult to detect problems by

    tested on site are less then the single modulo multifunction relay Autorecloser (Autorecloser function integrated in multifunction relay) Often, relay power replaced consumption is not be a tested Only few site type of

    The site test is highly depend on the manufacturer. Even an experienced test engineers need to carefully study Manufacturer Manuals. Moreover a special needed software and hardware is to perform the site test. Defective in Autorecloser element can repaired on site. In some

    wiring need to be

    cases, the whole relay need to be

    lower,

    Modern and computerized relay test

    set is needed to perform the site test

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