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1. more than five seconds The DCM module will confirm the mode change by flashing all LEDs simultaneously Once the TUNE button is released the tuning will start in opposite channel order i e beginning with channel C2 and ending with channel A1 The reversed tuning order is an indication of that the DCM module is in GIS mode To switch back to normal mode 1 Keep the TUNE button pressed down for more than five seconds The DCM will confirm the mode change by flashing all LEDs simultaneously Once the TUNE button is released the tuning will start beginning with channel A1 and ending with channel C2 Note f tuning is not successful LEDs off after completed tuning it could hint that the impedance of the circuit is too low To fix this problem the DCM cables between the small box and the clamps can be spread from each other If you move the position of a DCM cable s high frequency part between small box and circuit breaker you need to re tune the system The same applies if ferrites are moved added removed Tuning Once all ferrites are attached the system need to be tuned This must be done when the circuit breaker is in closed position 1 Check that the circuit breaker is in closed position 4 MOUNTING SET UP 2 Press the TUNE button shortly The tuning is performed automatically chan nel by channel and its corresponding LED flashes Tuning will take about half a minute and when finished all channel LE2. 9001 and 14001 Megger Sweden AB Eldarv gen 4 T 46 8 510 195 00 Box 2970 F 46 8 510 195 95 SE 187 29 TABY seinfo megger com Sweden www megger com ZP CGO4E Contents 1 Safety 5 Application examples 6 16 LAG ENES PPP Cn On 6 Without and with transformer disconnector 16 1 2 Safety instructions u 6 Insulated ground switch only available on 3 d the DUS Dar sense 16 Intr ion l o froductio 8 Insulating ground switches missing 17 a Cable grounded in another substation 17 Application area eeeccceecceceeeeeeeeeceeeeeteteeesseeeeaees 8 i Generator circuit breaker set UP enee 18 Principle of a ferrite eeenen 8 When is a ferrite required 8 6 Specifications i ae 20 2 Kit description 10 E eae eA 22 Ferriterkit Bars 10 3 Basics 12 Preregulisites sans 12 Insulated ground switch 12 Shape of shunts and spacing between shunts and CASHING nn ee eier 12 Shunts need to have insulation washers 12 Flexible cables with ferrites attached 12 Alternative paths for the ground current 13 ME 13 Shielded cables 22 2 13 All other ground connections 13 Too many parallel ground connections 13 Too long measurement loop 13 4 Mounting Set up 14 Mounting combinations eee 14 Attaching the hook
3. CB Insulation Su Conducting part N Ferrite L Detachable shunt Insulated ground switch with shunt and ferrite attached Shape of shunts and spacing between shunts and casing The shunts have to be shaped in a way that it is pos sible to attach a ferrite around it Likewise there must be enough space between the shunt and the casing of the ground switch to fit a ferrite Shunts need to have insulation washers The bolts holding the shunts have to be equipped with insulation washers If not attaching ferrites around the shunts will have no effect since the current is conducted through the bolts we Insulation washer is SER 7 A Ip Ferrite C N Groundingshunt Insulation washer No insulation washer Pe a Current path with and without insulation washer Flexible cables with ferrites attached If the dimensions of the shunt and or the spacing don t allow attaching a ferrite the shunt can be replaced by a flexible cable on which a round shaped ferrite can be attached mM E EM Important Before replacing the shunt with a cable the following points must be obeyed Always comply with local safety regula tions The circuit breaker must be closed and grounded on both sides The shunt replacement cable must be mounted before the shunt is removed The cable must have the same as or bet ter conducting capability than the shunt The shunt
4. replacement must be approved by the manufacturer of the GIS circuit breaker Examples of flexible cables with ferrites attached yy FERRITE KIT ZP CGO4E 3 BASICS All other ground connections In some installations the isolated part of the ground switch is not only grounded through the shunts but also has a separate grounding bar In such case ferrites need to be applied on the grounding bar Too many parallel ground connections A parallel shunt ground connection decreases the impedance by half although ferrites are applied on both paths If there are too many parallel shunts con nections to ground the resulting impedance might be too low for DCM to sense a difference between closed an open circuit breaker Where the limit of number of parallel paths is cannot be stated generally but has to be tested out from installation to installa tion On the contrary putting ferrites in series on the same shunt ground connection increase the impedance So this might be a solution when there are too many parallel paths to ground Too long measurement loop The DCM measurement circuit is optimized for best amplitude response when connected to GIS circuit breakers having reasonable distance between ground switches say 10 m 33 however distances up to 20 m 66 might be managed Alternative paths for the ground To achieve desired functionality ferrites must be ap Note This is not guaranteed functionalit
5. Ds with cables connected will be lit 3 Proceed as a normal time measurement ZP CGO4E FERRITE KIT 15 5 APPLICATION EXAMPLES 5 Application examples Without and with Insulated ground switch transformer disconnector only available on the bus Both are possible with DCM bar In this example the B bus bar need to be taken out of A service B A 4 p CB I ll CB lI GIS I GIS A B Measurement lead access points are shown with red arrows I CB I oi GIS Measurement lead access points are shown with red arrows FERRITE KIT ZP CGO4E Insulating ground switches missing Access points outside GIS e g on transformer or line In these examples ferrites might be needed on the transformer and line grounding Optional ferrite Line Measurement lead access points are shown with red arrows 5 APPLICATION EXAMPLES Cable grounded in another substation mm HE EM EM Important Before you connect the test leads you must confirm that there is less than 0 7 volts potential difference between the access points when the circuit breaker is open No ferrites needed in this example Access point to conducting part of cable can on certain GIS designs be found at the bushing where the cable connects to the GIS On some designs an insulation cone can be removed to get access to the con
6. Ferrite kit Accessory for timing of GIS circuit breakers using TM1800 with DualGround User s Manual egger ZP CGO4E Megger Ferrite kit Accessory for timing of GIS circuit breakers using TM1800 with DualGround User s Manual NOTICE OF COPYRIGHT 8 PROPRIETARY RIGHTS O 2009 Megger Sweden AB All rights reserved The contents of this manual are the property of Megger Sweden AB No part of this work may be reproduced or transmitted in any form or by any means except as permitted in written license agreement with Megger Sweden AB Megger Sweden AB has made every reasonable attempt to ensure the completeness and accuracy of this document However the information contained in this manual is subject to change without notice and does not represent a commitment on the part of Megger Sweden AB Any attached hardware schematics and technical descriptions or software listings that disclose source code are for informational purposes only Reproduction in whole or in part to create working hardware or software for other than Megger Sweden AB products is strictly prohibited except as permitted by written license agreement with egger Sweden AB TRADEMARK NOTICES Megger and Programma are trademarks registered in the U S and other countries All other brand and product names mentioned in this document are trademarks or registered trademarks of their respective companies egger Sweden AB is certified according to ISO
7. and loop fastener 14 How to connect the DCM cables 14 Set mode for DCM and tune the system 15 How to enter the GIS mode 15 To switch back to normal mode 15 A ee 15 MEN FERRITE kit ZP CGO4E ZP CGO4E 1 SAFETY 1 1 General 1 2 Safety instructions Sharp edges moO EM EM Important The ferrites have sharp edges and have to be handled Read and comply with the following in by care to avoid personal injury structions il Always comply with local safety regula Fragile tions The ferrites are very fragile and need to be handled with care For example dropping the ferrite to the ground will most probably cause that it will crack Due to this there is no warranty on damaged ferrites Wa FERRITE kit ZP CGO4E 1 SAFETY ZP CGO4E FERRITE KIT yy 2 INTRODUCTION Introduction Application area Time measurement using TM1800 with Dynamic Capacitive Measurement DCM on Gas Insulated Switchgear GIS Circuit Breakers CB grounded on both sides using ground switches earth switches Principle of a ferrite One property of the ferrite is that it increases the impedance of a conductor it surrounds Since the DCM technology uses high frequency AC current as test current we can take advantage of this property to increase ground loop impedance When is a ferrite required Ferrites are nee
8. d casing is small it might be wise to first apply the hook and loop fastener to the I shaped ferrite before it is entered behind the shunt and then apply the C shaped ferrite Note To obtain full effect of the ferrites they must be fastened tight together without any air gap between the contact surfaces How to connect the DCM cables The access point for one of the test lead clamps is on the isolated part of the ground switch However choosing the second access point might not be equally obvious The principles for selecting measurement lead access points are m The longer ground loop the better m The shorter loop through the circuit breaker the better So if there is a choice of access points the most suitable ones according to the above rules should be selected In most cases though it is sufficient to connect the test clamps on each side of the ferrite LCE FERRITE KIT ZP CGO4E Set mode for DCM and tune the system The TM1800 DCM module has two modes Normal mode and GIS mode The difference between the two modes is that the GIS mode is more sensitive After starting TM1800 the DCM mode is always reset to normal mode m The normal mode shall be used on open air circuit breakers a The GIS mode shall be used for GIS circuit breakers but it can also be used for open air circuit breakers having one interrupter per phase How to enter the GIS mode 1 Keep the TUNE button pressed down for
9. ded when the ground loop has low impedance compared to the circuit breaker loop On Air Insulated Switchgear AIS ferrites are normally not required due to that the ground loop is considerably longer than the circuit breaker loop On GIS break ers though the ground loop is usually about the same length as the circuit breaker loop and therefore ferrites are required to increase the impedance in the ground loop DE FERRITE kit ZP CGO4E 2 INTRODUCTION Testleads Circuit breaker loop Ground loop To DCM module Insulation Ferrite To DCM module 1 To DCM module Relation between ground loop and CB loop on GIS open air and dead tank circuit breaker ZP CGO4E FERRITE KIT 9 2 KIT DESCRIPTION Ferrite kit parts Designation Pcs Art No Transport case 1 GD 00440 C shape ferrite 7 XB 40010 I shape ferrite 4 XB 40020 Round ferrite 4 30 67090 Hook and loop 4 09 10140 fastener User s Manual 1 ZP CGO4E EI Ferrite kit ZP CGO4E 2 KIT DESCRIPTION ZP CGO4E 3 BASICS Prerequisites Insulated ground switch At least one of the ground switches need to be of insulated type i e there must be a part connected to the inner conducting part through the closed ground switch that is possible to disconnect electrically by detachable jumpers or shunts I
10. ducting part Cablegrounded in anothersubstation IRS Measurement lead access points are shown with red arrows ZP CGO4E FERRITE KIT yA 5 APPLICATION EXAMPLES Generator circuit breaker set up No ferrites needed in this example The generator s winding gives sufficient impedance in the ground loop GCB Measurement lead access points are shown with red arrows EEJ FERRME kit ZP CG04E 5 APPLICATION EXAMPLES ZP CGO4E 6 SPECIFICATIONS Specifications Dimensions C shape ferrite A 101 5 iat ae B 20 5 mm 0 81 37 5 mm 1 48 D 13 5 mm 0 53 E 85 5 mm 3 37 F 8 mm 0 31 ii a Note Measures does not include hook and loop fastener B C l shape ferrite A 102 mm 4 02 B 7 5 mm 0 3 37 5 mm 1 48 Note Measures does not include hook and loop fastener lt Y ya A 55 5 mm 2 18 B 43 mm 1 69 C 26 mm 1 02 Max cable diam 25 4 mm 1 Round ferrite C Hook and 26 X 290 mm 1 02 X 11 4 loop fastener Transport case 390x310 100 15 4 x 12 2 x 3 9 Weight 4 5 kg 9 9 lbs total kit including transport case FERRITE KIT ZP CGO4E 6 SPECIFICATIONS ZP CGO4E INDEX Index A Application examples occcccccccccccccccccccos 16 C Connect the DCM cables 14 C shape ferrite oocococccicicicicicecininicinic
11. ininininos 10 E Flexible Cables ooococccccococonocononcnonononcncnos 12 G GIS mode nennen 15 Ground current eiii da 13 Ground SWIICh usa 12 H Hook and loop fastener sneeeeeeeeeaaen 10 14 I Insulated ground switch 12 Insulation WasSherS oonoccccnccoconcnononcncnnnnnnnnnns 12 I shape ferrite senere 10 M Maneuver shafts siririna 13 Measurement loop nennen 13 Mounting een 14 N Normal mode occocncnccnccncnnnnconononononcnnninnnonononos 15 P Parallel ground connections see 13 Principle of a ferrite nn 8 R RETURN E anne 15 Round ferrite caco 10 S Set mode for DCM cccccccccceeeceeeeeeeeeeeeees 15 Shielded Cables ooocccicccicccicccicinicicicicininnnn 13 MUN Suicida 12 T Tune the system 2242 cios 15 E FERRME kit ZP CGO4E SWEDEN Megger Sweden AB Eldarvagen 4 Box 2970 SE 187 29 TABY T 46 8510 195 00 F 46 8510 195 95 E seinfo megger com UK Archcliffe Road Dover CT17 9EN England T 44 0 1304 502101 F 44 0 1304 207342 E UKsales megger com Other Technical Sales Offices Dallas USA Norristown USA Toronto CANADA Trappes FRANCE Oberursel GERMANY Johannesburg SOUTH AFRICA Kingdom of BAHRAIN Mumbai INDIA Chonburi THAILAND Sydney AUSTRALIA Megger WOD YIDDINW MMM Subject to change without notice Printed matter No ZP CG04E Doc CG1842BE 2009
12. y and it has plied on all shunts and or devices that interconnect to be tested out from case to case the nn part of the ground switch to ground for Long distances between groundings can be found in example out door GIS installations or if the bus bar is equipped with an insulated ground switch Maneuver shafts The ground switch might be operated by a maneu ver shaft that transfers the power from the operat ing mechanism to the switch in case the operating mechanism is externally located If this maneuver shaft is made of a conducting material you need to apply a ferrite around it If the same maneuver shaft operates all three phases ferrites need to be applied between the phases to separate them from each other Shielded cables If there is a signal cable going to the ground switch it is most likely of shielded type and then it is necessary to apply a ferrite around the cable ZP CGO4E FERRITE KIT 13 4 MOUNTING SET UP A Mounting Set up Mounting combinations BE HE A EM EM Important Always comply with local safety regula tions There are three mounting possibilities with the ferrite kit A Round ferrite to attach on cables or maneu ver shafts B C shape combined with I shape when the spacing between shunt and casing is small C Two C shapes when the shunt is thicker than 12 mm Y Combination B and C Attaching the hook and loop fastener If the space between shunt an
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