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Uniswitch Medium Voltage Switchgear

12 kV, 17.5 kV, 24 kV
630 A and 1250 A

Operation and Maintenance Manual

Summary of Contents for Uniswitch

Page 1: ...Uniswitch Medium Voltage Switchgear 12 kV 17 5 kV 24 kV 630 A and 1250 A Operation and Maintenance Manual ...

Page 2: ...king 20 3 5 3 3 Locking devices 21 4 Operation of the switchgear 22 4 1 General cautions and warnings 22 4 2 Commissioning 23 4 2 1 Preparatory work 23 4 2 2 Start up 24 4 3 Operating the fixed type switchgears 25 4 3 1 Manual operation of the SFG switch disconnector 25 4 3 1 1 Closing the SFG switch disconnector 25 4 3 1 2 Opening the SFG switch disconnector 25 4 3 1 3 Operating the SFG switch di...

Page 3: ... CL 497 and CL 498 39 5 Service and maintenance 40 5 1 General warnings and cautions 40 5 2 Maintenance intervals 42 5 3 Inspection 43 5 4 Servicing 44 5 5 Repair 45 5 5 1 Switchgear in general 45 5 5 2 Replacement of melted fuse links 46 5 5 2 1 Investigate and clear a fault 46 5 5 2 2 Removal of the fuse links 47 5 5 2 3 Installing the fuse links 47 5 6 Testing withdrawable parts 48 5 6 1 Testin...

Page 4: ...ment transformers and secondary apparatus The units are designed as fixed or withdrawable modules and are fitted with a single busbar system The withdrawable parts are always with circuit breakers By combining the standard components a system which offers a wide range of different device arrangements can be made Applications The Uniswitch switchgear and controlgear system is designed for use in ge...

Page 5: ...oltage alternating current circuit breakers 1987 IEC 60129 Alternating current disconnectors and earthing switches 1984 Am1 1992 Am2 1996 IEC 60265 1 High voltage switches Part 1 Switches for rated voltages above 1 kV and less than 52 kV 1998 IEC 60420 High voltage alternating current switchfuse combinations 1990 IEC 60529 Degrees of protection provided by enclosures IP Code 1989 IP 2XC for enclos...

Page 6: ...s defined in the IEC standards IEC 60694 it has to be agreed separately with the manufacturer Table 1 1 Normal indoor service conditions according to IEC standards Ambient air temperature Maximum 40 C Maximum 24 h average temperature 35 C Minimum 24 h average temperature 5 C Recommended minimum 5 C Altitude above sea level Maximum 1000 m Conditions of humidity Average value of relative humidity 24...

Page 7: ...tors as well as for the components otherwise the current carrying capacity will be limited When switchgears are operated in areas with high humidity and or major rapid temperature fluctuations there is a risk of dew deposits which must remain an exception in normal service conditions for indoor switchgear Preventive action e g fitting electric heaters must be taken in consultation with the manufac...

Page 8: ...250 630 1250 630 1250 Rated short time withstand current 2 kA Main circuit 25 20 20 Earthing circuit 25 20 20 Rated duration of short circuit s 2 3 3 Rated peak withstand current kA 62 5 50 50 Degree of protection IP code For the enclosure IP 2XC IP 2XC IP 2XC For the partitions IP 2X IP 2X IP 2X Mechanical endurance of switch disconnector Times Closed Open 1000 1000 1000 Open Earthed 1000 1000 10...

Page 9: ...s 24 kV 20 kA 1s Standards The switchgear units have been tested according to IEC 60298 Standards appendix AA class A criteria 1 to 6 Uniswitch switchgear has to be installed in closed rooms suitable for electrical equipment This means the accessibility must be restricted to authorised personnel only The rear side of the switchgear is not accessible Rear side accessibility must be discussed with t...

Page 10: ...ubicles are divided into separate compartments The compartments are designed so that they withstand the very rapid rise in temperature and pressure caused by a possible arc fault condition 3 2 Cubicle design and equipment 3 2 1 Compartments of fixed type switchgear Figure 3 1 Compartments in fixed type switchgear Compartments The cubicle is divided into the following compartments see Figure 3 1 1 ...

Page 11: ...witch disconnectors the comparments are provided with facilities for padlocking Such a compartment is then designated a procedure controlled accessible compartment 4 Control and Secondary Apparatus Compartment The compartment includes space for switch disconnector and earthing switch operating mechanisms and mechanical interlocks with position indicators Other components such as auxiliary contacts...

Page 12: ...anch conductor 61 Earthing switch operating mechanism 40 Busbar 61 2 Operating shaft for earthing switch 41 1 Post insulators for branch bars 60 1 Spindle mechanism 41 2 Fixed contact 60 5 Lever shutter lifting 46 1 Earthing switch 60 6 Opening pushbutton 45 1 Current transformers 60 7 Closing pushbutton 11 2 Main earthing bar 45 2 Voltage transformers 11 1 Cable clamp 12 1 Travel trails The enclo...

Page 13: ...o two different sections by means of metallic partition 2 Circuit breaker cable compartment 3 5 see also Figure 3 2 and Figure 3 9 There are interlocks to ensure that live parts inside are dead and earthed before opening This compartment is designated an interlock controlled accessible compartment The common circuit breaker cable compartment contains all the necessary equipment for reciprocal oper...

Page 14: ... flexible fully insulated cables which are inserted into the transformers The EM type earthing switch can be used with a manually operated mechanism Its switching position will be indicated both mechanically and electrically by means of the auxiliary switch In the cubicle up to two parallel plastic cables can be connected with single core cable protection and push on sealing ends Figure 3 4 Low vo...

Page 15: ...g part with the circuit breaker is moved manually by means of a spindle 60 1 between the service or test disconnected positions with the front doors closed Service and test disconnected positions are set precisely by means of auxiliary switches 60 3 which indicate the final position reached and the angular position of the spindle The rollers and travel rails 12 1 Figure 3 10 which are bolted onto ...

Page 16: ...hen a main circuit compartment is opened According to IEC 62271 200 the Loss of Service Continuity LSC of Uniswitch switchgear is LSC2A PI The PI denotes that partition and shutters are insulation Table 3 1 Accessibility to compartments according to IEC 62271 200 Part of the switchgear that can be left energised Cable corresponding to the functional unit All other functional units Fuse cable No Ye...

Page 17: ...s The two high voltage compartments busbar compartment circuit breaker cable connection compartment are equipped with inspection windows Neighbouring cubicles are partitioned from one another by the side walls of each cubicle The front of the cubicle is closed off by a pressure resistant removable door The door of the high voltage compartment is pressure resistant On the end cubicle sides cover pl...

Page 18: ...cking selector has four positions Position 1 Operation SFG switch disconnector can only be operated close open The cable compartment door cannot be opened Position 2 Padlock SFG switch disconnector cannot be operated and the cable compartment door cannot be opened Position 3 Test and earthing SFG switch disconnector can only be operated open earthed The cable compartment door cannot be opened Eart...

Page 19: ...ch Operation and Maintenance Manual UNIS14GB 05 02 Interlocking system The use of the interlocking system and permitted operations are shown in the figure below Figure 3 8 Interlocking system and permitted operations ...

Page 20: ...When the cable compartment door is open the SFG switch disconnector is locked in the earthed position The interlocking can be removed by moving the interlock selector to the Test position This will allow the switch disconnector to be operated to the open position to enable insulation measurement of the cables After measurement the switch disconnector first has to be moved to the earthed position b...

Page 21: ...o socket 50 1 mechanical interlock The circuit breaker can only be switched on when the withdrawable part is in the test or service position In the intermediate position the circuit breaker is mechanically interlocked When the circuit breakers have an electrical release the interlock is also electrical In cubicles with digital control technology prevention of malfunction of the circuit breaker can...

Page 22: ... the test disconnected position or outside of the cubicle mechanical interlock 61 3 and 61 4 If the earthing switch is on the withdrawable part cannot be moved from the test disconnected position to the service position mechanical interlock References Details of other possible interlocks e g in connection with a locking magnet on the withdrawable part and or earthing switch drive can be obtained f...

Page 23: ...ar Circuit breaker compartment door locking device Door interlocks The cubicles are equipped with the following door interlocks The apparatus compartment door cannot be opened if the circuit breaker is in service or in an undefined position The circuit breaker cable compartment door cannot be opened if the earthing switch is open ...

Page 24: ...cubicle Figure 3 13 Using the padlock withdrawable type cubicle Padlock Access to the operating shaft of the earthing switch can be restricted with a padlock Figure 3 12 Access to the circuit breaker racking slot can be restricted with a padlock Figure 3 13 Access to the circuit breaker cable compartment can be restricted with a padlock ...

Page 25: ...points for pressure relief The switching operations are to be carried out with the doors closed The relative work and operating procedure must be carried out carefully by a trained specialist familiar with the installation taking into account all the relative safety regulations according to the IEC and other relevant professional bodies as well as any local and work regulations and instructions ...

Page 26: ...icky dirt as described in section 5 4 Correctly remount all covers etc removed during assembly and testing procedures Remove transport caps from vacuum circuit breakers if still fitted Remove the lifting eyebolts on high current vacuum circuit breakers if still fitted Preparatory work for SF6 circuit breakers Clean the insulating parts with clean dry cloth Check that the upper and lower terminals ...

Page 27: ...wer source remote control system complete earthing system switchroom equipment switchroom conditions 4 2 2 Start up Instructions Comply with all relevant safety regulations Ensure that the switch disconnectors and circuit breakers in the system are in the OPEN position Remove any existing earthing and short circuiting connections in the critical switching area Energize the feeder cables Connect th...

Page 28: ...ng handle into the hole so that the guide key goes into the notch on the shaft 5 Turn the operating handle clockwise about 80 degrees until the switch disconnector closes 6 If the device is fitted with a double spring control mechanism switch fuse the turning force must be increased towards the end of the movement until the switch disconnector finally closes The operation movement is always to be ...

Page 29: ...shaft 5 Turn the operating handle anti clockwise about 80 degrees until the switch disconnector moves to the earthed position 4 3 1 4 Opening the SFG switch disconnector from the earthed position Figure 4 4 Opening from earthed position 1 Ensure that the switch disconnector position indicator is in the earthed position 1 2 Check that the interlocking selector is in the Test 2 position 3 Check that...

Page 30: ...aneously between open and earthed position Because the switch disconnector is capable of breaking currents under normal circuit conditions there is not any need for mechanical interlocks between the circuit breaker and switch disconnector Operating sequences Earthing the cubicle Figure 4 5 Operating and signalling parts of fixed type HD4 circuit breaker 1 Open the circuit breaker either electrical...

Page 31: ... Figure 4 6 Withdrawable assembly for circuit breaker with auxiliary switches 3 10 Figure 4 7 Hand crank 1 Connect control wiring plug 44 4 Figure 4 9 to socket 50 1 Figure 4 8 2 Close the front door 3 Ensure that the circuit breaker is in the OFF position 4 Fit hand crank 80 2 on square spigot 60 1 of the spindle mechanism 5 Turn the crank clockwise approx 20 turns until the stop is reached and t...

Page 32: ...on the rear side of the cubicle door when the hand crank is moved from square spigot of spindle mechanism This ensures that the rear part of the pinhead has been shifted onto the hexagonal cap of the spindle and prevents unintentional wrenching of the spindle during cubicle service Wrenching may lead to the circuit breaker blocking The withdrawable part must not be stopped in any intermediate posi...

Page 33: ...the interlocks and check that the operating sequence is correct The force normally applicable to the insertion withdrawing lever is 260 N In any case the maximum applicable force must never exceed 400 N Please also refer to the technical documentation of the circuit breakers for installation operations Insertion and withdrawal must always be carried out with the circuit breaker open Do not use for...

Page 34: ...ruck Figure 4 10 Positioning the service truck 81 with the guide pins on the adjustable height bench 81 2 top at the correct height for approach to the switchgear panel and engaging the catch 81 3 Figure 4 11 Service truck engaged with the switchgear panel Withdrawable part 44 released for withdrawal with the handles sliding 60 9 inwards ...

Page 35: ...able bench top at the correct height facing the cubicle front and allow catch 81 3 Figure 4 10 to engage 4 Move sliding handles 60 9 inwards against the springs to release withdrawable part 44 draw the withdrawable part out onto the service truck and secure it in the catches 81 5 on the truck 5 Press release lever 81 4 at the front underneath the bench top and release the service truck from the sw...

Page 36: ... position and the earthing switch is in Closed position Figure 4 13 Lift the door by the handle Figure 4 14 Pull the door away Figure 4 15 Closing the door Lift the door first onto the door step and then close it Ensure that the door is properly closed by pushing it downwards Figure 4 16 The door to the control and secondary apparatus compartment can be opened by turning the handle in a clockwise ...

Page 37: ...3 2 Opening and closing the VD4 type circuit breaker Instructions Figure 4 18 Opening and closing operations with the withdrawable part in the service position should only be performed with the door closed Operate the local or remote electrical control Observe the switch position indicator The switching operation counter 43 3 Figure 4 17 for the circuit breaker automatically increases by one unit ...

Page 38: ...operation geared motor for automatic charging of the closing springs shunt closing release shunt opening release The geared motor automatically recharges the springs after each closing operation until the yellow indicator 43 4 appears Should there be no voltage during charging the geared motor stops and then starts recharging the springs automatically when the voltage is on again In any case it is...

Page 39: ...hat opening has been accomplished An additional control mechanism fitted in the door of the circuit breaker compartment enables mechanical operation of the circuit breaker with the door closed and with the withdrawable part in either position Press the relative mechanical pushbutton 60 6 having previously turned knob 60 12 anticlockwise to the stop if the withdrawable part is in the service positi...

Page 40: ... switch allocated to a circuit breaker is only enabled for switching when withdrawable part is in the test disconnected position or removed from the switchgear cubicle Only turn earthing switches on when the door is closed Indication of position 2 Figure 4 24 The position of earthing switch can be indicated electrically by means of auxiliary switch 50 2 The auxiliary switch has been fixed on the s...

Page 41: ...it operating lever 80 3 Figure 4 24 onto shaft 61 2 Figure 4 23 which is now released for operation Turn the lever clockwise through approx 90 until the stop is reached to close the earthing switch or anti clockwise until the stop is reached to open the earthing switch Observe the mechanical 61 9 electrical switch position indicator Remove operating lever Slide remains open if the earthing switch ...

Page 42: ...tage indication The voltage state of the cubicle is indicated by a flashing light the frequency of repetition is at least 1 Hz Under extra bright illumination it may be necessary to improve visibility by additional means Operating temperature VPIS will operate reliably over a temperature range of 25 50 C Phase comparison and testing of VPIS Each phase of the integrated voltage presence indicating ...

Page 43: ... silicone liquid such as DC200 100CS or similar When carrying out all maintenance work the regulations in the country of installation must be strictly complied with Maintenance work may only be performed in a careful manner by trained personnel familiar with the characteristics of the individual switchgear in accordance with all relevant IEC safety regulations and those of other technical authorit...

Page 44: ...uding pollution and aggressive air Time intervals for maintenance work to be carried out always depend on the operating conditions of the switchgear and mainly on the mode of operation the number of rated and short circuit current switching operations ambient temperature pollution etc For the Uniswitch switchgear under normal service conditions maintenance intervals and measures according to Table...

Page 45: ...for withdrawable type Activity performed According to section Time interval in years According to number of switching operations Inspection 5 3 4 1 Servicing 5 4 4 2 10 000 3 Repair 5 5 As required As required 1 Under more demanding service conditions we recommend shortening this interval appropriately also sections 5 2 and 5 3 2 According to results of inspection 3 See the instruction manual for ...

Page 46: ...aces of contact systems o Contact points should be cleaned if signs of overheating discolored surface are visible We recommend to turn the contact system of the withdrawable part back and forth in order to clean the inner contact points of the contact system Inspection must also include correct mechanical electrical operation of the following switching devices With regard to the switching devices ...

Page 47: ...d circuit breakers including the earthing switches 4 Connect the auxiliary control voltage but ensure that no remote signals can activate the components Perform one electrical operation sequence on all motor operated devices and tripping mechanisms 5 Clean the busbar compartment and cable compartment Remove the switchgear cubicle roof and clean the SFG switch disconnector insulation materials and ...

Page 48: ...dry non fraying cloth Next treat the cleaned parts with zinc spray or zinc powder paint and finally treat with aluminum spray for color matching o passivated operating parts and rust formation on phosphatised parts with a wire brush or metal free cleaning pad e g Scotch Brite and clean with a dry cloth Then grease evenly with Isoflex Topas NB 52 Follow the maintenance instructions in the manuals f...

Page 49: ... automatically by means of the striker pin s of the fuse link s and tripping mechanism Instructions Figure 5 1 Position indicator in O position Check that the color of fuse indicator 62 5 is red and the position indicator 62 4 is in O position Check that the interlocking selector is in the Operation 2 position see 4 3 1 2 Put the operating handle into the hole 62 2 so that the guide key goes into ...

Page 50: ...e lower end of the fuse link first and then the upper end 5 5 2 3 Installing the fuse links Figure 5 4 The striker pin of the fuse links must be upwards see the arrow 47 3 Figure 5 4 on the fuse link Start the installation from phase L3 farthest from door Push the fuse link first into the upper fuse holder 47 1 Figure 5 4 and then into the lower holder 47 2 Figure 5 3 Drag the fuse link downward a...

Page 51: ...ted position to the service position when the circuit breaker is open and the earthing switch is open Check the following conditions individually With the circuit breaker closed insertion of the withdrawable part towards the service position must be locked after only half a turn of the crank in the clockwise direction With the earthing switch closed insertion of the withdrawable part towards the s...

Page 52: ...ly be possible when the withdrawable part is in the defined test disconnected position or service position The control wiring plug must previously have been inserted Check this condition as follows It must not be possible to close the circuit breaker with the withdrawable part in any position between the test disconnected position and the service position Enabling of switching when the withdrawabl...

Page 53: ... as later insertion must be locked in the withdrawable part service position 8 Operation of the earthing switch must only be possible when withdrawable part is in the test disconnected position or the removed position subject to any additional electro magnetic interlock in individual cases Check this condition With the withdrawable part in the test disconnected position it must be possible to pres...

Page 54: ...vailable on request for procurement of spare parts It basically includes moving parts and parts subject to wear When parts are required the serial number of the relative switchgear or switching device should always be quoted 5 7 2 Auxiliary materials and lubricants Table 5 3 Lubricants and auxiliary materials Lubricant Isoflex Topas NB 52 Touch up paint Standard colour RAL 7035 ...

Page 55: ... Switch disconnector cannot be moved from the open to earthed position Check that the switch is in the earthed position Check that the interlocking selector is in the Test position Turn the operating handle clockwise Cable compartment door will not open or close Check that the switch is in the earthed position Check that the interlocking selector is in the Door open position Motor operated switch ...

Page 56: ...fore opening or closing the door The circuit breaker will not go to the closed position Ensure that the closing spring is fully charged and that the interlocking coil is not energised Check that the circuit breaker key is in place and turned to the correct operating position Check that the circuit breakers auxiliary voltage plug is properly locked into the socket Check that the control pin is on i...

Page 57: ...l and other requirements for environment protection according to the ISO 14 001 standard The duty of our company is to facilitate subsequent recycling or disposal at the end of product life During disposal of the product it is always necessary to act in accordance with local legal requirements in force ABB disposal methods We have the following methods of disposal Disposal can either be carried ou...

Page 58: ...icle that is to be removed from use can best be disposed of by dismantling the parts by hand Materials used The following materials have been used in the manufacture of the cubicles Steel Stainless steel Copper Bronze Aluminium Epoxy EPDM rubber Various plastics SF6 gas The switchgear metal plastic and EPDM rubber parts can be recycled The epoxy insulated instrument transformers and sensors can be...

Page 59: ...ABB 56 Uniswitch Operation and Maintenance Manual UNIS14GB 05 02 ...

Page 60: ...pparatus Switchgear P O Box 613 FIN 65101 Vaasa Finland Tel 358 10 22 11 Fax 358 10 22 44661 www abb com mediumvoltage Information given in this publication is generally applicable to equipment described Changes may be made in future without notice ...

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