Siemens 3AK7 Operating Instructions Manual
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Siemens 3AK7 Operating Instructions Manual

Siemens 3AK7 Operating Instructions Manual

Vacuum circuit-breaker
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3AK7
3AK7 vacuum circuit-breaker
OPERATING INSTRUCTIONS
© Siemens AG 2008. All rights reserved.
Order No.: 9229 0055 176 0B
Version: 05.2019 en

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  • Page 1 3AK7 3AK7 vacuum circuit-breaker OPERATING INSTRUCTIONS Order No.: 9229 0055 176 0B Version: 05.2019 en © Siemens AG 2008. All rights reserved.

  • Page 2: For Your Safety

    For your safety Signal terms and Personal injury hazards are classified according to ISO 3864-2 using the keywords definitions DANGER, WARNING and CAUTION. DANGER Indicates a hazard with a high degree of risk which, if not avoided, will result in death or serious injury.

  • Page 3: Table Of Contents

    Contents For your safety ..............................2 List of abbreviations ............................4 Transport, storage and packing ........................5 Transport ................................5 Unpacking ................................6 Reusing the transport unit ........................... 9 Storage ................................9 General information ............................11 Areas of application ............................11 Standards ................................

  • Page 4: List Of Abbreviations

    List of abbreviations BGBl Bundesgesetzblatt (German Federal Law Gazette) Close-Open Deutsches Institut für Normung (German Institute for Standardisation) International Electrotechnical Commission NC contact NO contact Open Pole-centre distance RöV Röntgenverordung (German X-Ray Ordinance) Verband Deutscher Elektrotechniker (Association of German Electrical Engineers) 9229 0055 176 0B 2019-09-02...

  • Page 5: Transport, Storage And Packing

    Transport, storage and packing Transport, storage and packing Transport WARNING Heavy transport weight Transport unit may fall and fail and sling gear may break. Use lifting gear, transport and sling gear suited to the requirements and load-car- rying capacity. Observe transport symbols. Transport weight Refer to the delivery slip for the weight of the transport unit.

  • Page 6: Unpacking

    Transport, storage and packing Transporting with packing Transport the transport unit to the installation site or storage location • with a fork-lift truck or • with sling gear suspended from a crane at a spreading angle of approx. 60° or with a cross-member.
  • Page 7 Transport, storage and packing Opening the transport unit • Place the transport unit on a level, non-slip and pressure-resistant surface. • Remove lifting gear or means of transportation. • Remove plastic wrap. • Lever out fasteners from the carton and lift off carton. Note Do not use the vacuum circuit-breaker in case of damage such as breaks, cracks, flaking, bent metal parts, damaged plug-in contacts, tears or bare cables.
  • Page 8 Transport, storage and packing Fig. 5 Removing the tensioning belts Fig. 6 Lifting the vacuum circuit-breaker Transporting without a • Remove all tensioning belts and bits of fastening wood. pallet • If necessary, remove the supplementary equipment and store safely in the pack- aging for later installation.

  • Page 9: Reusing The Transport Unit

    • Safely secure the carton to the pallet floor. • Before returning to the factory, ask the responsible Siemens representative for a returned products number (see also “Service”, on page 56). • When returning a vacuum circuit-breaker, always specify the type and serial number (see “Name plate”, on page 27).
  • Page 10 Transport, storage and packing Blank page 9229 0055 176 0B 2019-09-02...

  • Page 11: General Information

    Under normal service conditions, the vacuum circuit-breaker is maintenance-free for up to 10 000 operating cycles. Intended use 3AK7 vacuum circuit-breakers are suitable for switching any type of alternating cur- rent circuits under normal operating conditions, such as: • Three-phase motors for reversing, turning and direct operation •...

  • Page 12: Standards

    IEC 60265-1 • IEC/IEEE 62271-37-013 (to 15 kV) All 3AK7 vacuum circuit-breakers meet the requirements for circuit-breaker classes C2, E2 and M2 as per IEC 62271-100. Type approval as per the German X-Ray Ordinance The vacuum interrupters installed in the switching devices are type-approved as sources of interference radiation according to §...

  • Page 13: Description

    The operating mechanism box (60.) • The 3 pole assemblies (19.) with vacuum interrupters (30.) Pole assembly The pole assembly (19.) of the 3AK7 vacuum circuit-breaker consists of • The top interrupter carrier (20.) with the top connection (27.) •...
  • Page 14 Description Operating mechanism box The operating mechanism box (60.) contains all the electrical and mechanical com- ponents required to switch the vacuum circuit-breaker on or off. Insulating operating rods transfer the switching movements to the pole assemblies. The operating mechanism box is closed with a removable cover (60.1). Fig.
  • Page 15 Description Fig. 10 Open operating mechanism 50.2 Gear unit Operating mechanism box 50.4 Motor M1 Shock absorber 50.4.1 Position switches S21, S22, S3, S41, S42 Closing spring 50.5 Hand crank coupling Circuit-breaker shaft 53.1 Closing solenoid Y9 Opening spring 54.1 Shunt release Y1 Closing damping 54.2...
  • Page 16 Plug connector with sleeve housing 24-pole • Terminal strip (X1) Operations counter Mechanical manual closing and opening Additional equipment Each vacuum circuit-breaker 3AK7 can also be equipped with the following equip- ment: (Y2, Y3) Shunt release 3AX1101-.. (Y4, Y5) Current transformer operated release 3AX1102-.. (Y6) Current transformer operated release 3AX1104-..
  • Page 17 Description Motor M1 After the supply voltage is applied and if the closing spring is discharged, the motor starts immediately and is automatically deactivated internally after charging has taken place. Power consumption, maximum: • In the case of DC voltage approx. 750 W •...
  • Page 18 Description Closing solenoid (Y9) 3AY1510-.. The closing solenoid Y9 unlatches the charged closing spring and switches the vacuum circuit-breaker on elec- trically. It is available for DC or AC voltage. The closing solenoid Y9 is not designed for continuous operation and is automatically deactivated within the cir- cuit-breaker.
  • Page 19 Description Auxiliary switch S1 Auxiliary switch S1 is available for delivery in two ver- sions: with 6 NO contacts or 12 NC contacts respective- Contacts available on the customer's premises - see circuit diagram supplied. Rated insulation voltage: 250 V AC/DC Insulation group: C as per VDE 0110 Continuous current:...
  • Page 20 Description Position switch S21, S22 Position switches (switch off the motor after charging) Position switch (opens when the closing spring is charged) S41, S42 Position switches (report charging state) Fig. 18 Position switch (50.4.1) Circuit-breaker tripping signal, cut-out switch (S6, S7) The position switch S6 makes contact briefly when the vacuum circuit-breaker is opened by means of an elec- trical release.
  • Page 21 Description Low-voltage interface X0, 64-pole Fig. 20 Low-voltage interface X0 Fig. 21 Terminal strip X1 (optional) For the connection of the control cable, the standard version of the vacuum circuit- breakers is equipped with a 64-pole low-voltage interface X0 (68.7). The 64-pole plug (68.7.1) for the external terminal is suitable for the crimp termina- tion of control cables with a nominal cross-section of 1.5 mm Terminal strip (optional)
  • Page 22 Description A further shunt, transformer-operated, undervoltage or quickrelease can be installed as a 2nd release. 2nd shunt release (Y2) 3AX1101-.. The second shunt release Y2 is installed whenever more than one shunt release is needed. In this version, the electrical “open” command is passed by means of a magnet armature to the “OPEN”...
  • Page 23 Description Undervoltage release (Y7) 3AX1103-.. Note The undervoltage release Y7 may only be operated with the supplied series resistor R1. Note For switching operations (mechanical or electrical), the undervoltage release 3AX1103-.. must be connected to control voltage, as otherwise closing is not pos- sible.
  • Page 24 Description Heating (condensation water protection) R01 The heating serves to limit condensation and corrosion of the vacuum circuit-breaker. To this end, the heating has to be connected to the sup- ply voltage (see circuit diagram included with the deliv- ery). Fig.

  • Page 25: Interlocks

    Description Electrical manual closing / electrical locking In the basic version, the vacuum circuit-breaker is closed on site by direct mechan- ical unlatching of the closing spring. Instead of this mechanical manual closing, elec- trical manual closing is also available. In this version, the closing circuit of the vacuum circuit-breaker mode is actuated electrically via a switch and must also be released by a control unit from the control room.
  • Page 26 Description Mechanical interlock (optional with spring operating mechanism) An interrogation and actuation component (b) on the system side detects the oper- ating position (CLOSED/OPEN) of the vacuum circuit-breaker. CLOSED switch position If the vacuum circuit-breaker is closed, actuation of the system's interrogation and actuation component is prevented.

  • Page 27: Name Plate

    Dimensions and weight The dimensions of the vacuum circuit-breaker can be taken from the relevant dimen- sion drawing. If needed, they can be obtained from your Siemens representative. The weight is indicated on the vacuum circuit-breaker name plate (see Fig. 28) or refer to the associated dimension drawing.

  • Page 28: Ambient Conditions

    Description Ambient conditions Vacuum circuit-breakers 3AK7 are suitable for use in the following climate classes according to IEC 60721, part 3- +40 °C Class • Climatic ambient conditions: -5 °C 3Z2, • Biological ambient conditions: 95 % • Mechanical ambient conditions: 90 % •...

  • Page 29: Switching Times

    Description Switching times Closing time < 80 ms Opening time 1st shunt release (Y1) < 65 ms 2nd/3rd release (Y2 to Y7) < 50 ms Arcing time < 15 ms Break time 1st shunt release (Y1) < 80 ms 2nd/3rd release (Y2 to Y7) <...

  • Page 30: Circuit Diagrams

    Description Circuit diagrams The circuit diagrams show all the available components with their wiring options. Fig. 33 to Fig. 36 show non-binding examples of vacuum circuit-breakers. The circuit diagrams for the vacuum circuit-breaker are compiled depending on your order. Mechanical manual closing and electrical closing “OPEN”...
  • Page 31 Description The unassigned auxiliary switch terminals are wired up with the 64-pole plug bottom. Normal auxiliary switch Extended auxiliary switch No wiring required if 2nd shunt release Y2 available Undervoltage release Y7 available Fig. 35 Example - auxiliary switch terminals System wiring Tripping via Tripping via NO con-...
  • Page 32 Description Blank page 9229 0055 176 0B 2019-09-02...

  • Page 33: Installation

    Installation Installation DANGER High-voltage - danger to life Touching live parts causes an electric shock. • Do not touch live parts! • When work is performed on the switchgear, it must be de-energised and earthed! • The work described in the following sections must only be performed when the switchgear has been de-energised: Take safety measures to prevent reclosing! Observe industrial safety regulations!

  • Page 34: Attachment In The Switching Cubicle

    (see “Name plate” on page 27) in order to avoid confusion. Installation position The vacuum circuit-breaker 3AK7 can only be installed vertically (to the vacuum in- terrupter), as an indoor withdrawable part and as an indoor fixed mounting.
  • Page 35 Installation Installing the cover Fig. 38 Preparation Fig. 39 Installing the cover The cover (60.1) of the operating mechanism box (60.) is packed separately for transport and storage. • Remove the foil from the cover • Remove 4 screws and washers from the supplementary equipment •...

  • Page 36: Earthing

    Installation Installation of the vacuum circuit-breaker For the various types of installation, mounting holes are provided on the pole plate (15.) and on the operating mechanism box (60.). Mount the vacuum circuit-breaker tension-free and torsion-free at the specified mounting holes (*) on a frame, wall, or on a withdrawable part. Use M12 screws –...
  • Page 37 Installation 105 Nm Fig. 42 Earthing terminal Fig. 43 Connecting the earthing conductor Connecting low voltage Connect the low-voltage connection cable in the customer's cubicle in such a way that safe operation as per the supplied circuit diagram is guaranteed. Removing the transport block from the undervoltage release Undervoltage release (Y7) The vacuum circuit-breaker with a 3AX1103-..

  • Page 38: Electrical Connection Of The Prime Conductor

    Note Grease the conductor bars with contact grease prior to installation. The conductor bars can be purchased from the Siemens Service Center. Connecting the conductor bars Adjust the conductor bars so that, before fastening, they lie flat easily and fit the holes on the connecting surfaces of the vacuum circuit-breaker.
  • Page 39 Installation Fig. 48 Fitting the conductor bars Corresponding to the rated current strength, use M12 screws and nuts – strength class 8.8 – and the appropriate spring elements and washers to connect the con- ductor bars. Note For vacuum circuit-breakers with connection bars, we recommend using the stainless steel screws or non-magnetisable screws included with the supple- mentary equipment.
  • Page 40 Installation Blank page 9229 0055 176 0B 2019-09-02...

  • Page 41: Operation

    Temporary noise levels above 85 dB (A) can cause damage to health. Wear suitable ear protection. Commissioning Before commissioning, check the following points to ensure that the vacuum circuit- breaker 3AK7 is functioning faultlessly:  Checklist Notes Does the information on the name plate (see page 27) match the order data? Ensure correct operating voltage.

  • Page 42: First Closing Operation

    Checklist Notes Electrically check the auxiliary switch S1 (68.) and the position switch (50.4.1) in both end positions – operate the 3AK7 vacuum circuit-breaker to do so. Check the function of the closing solenoid Y9 (53.1) and all available shunt releases by operating them electrically.

  • Page 43: Closing

    Operation Hand crank If the supply voltage fails, the closing spring (62.) can be charged with a hand crank (50.). 1. For this, fit the hand crank (50.) onto the hand crank coupling (50.5) through the opening (50.1) with the adapter pushed forward (50.6). 2.

  • Page 44: Opening

    Operation Opening The opening spring (64) is charged during the closing operation. To open, send the opening command via the OPEN pushbutton (54.) or the corre- sponding control unit until the vacuum circuit-breaker is open and the OPEN switch position is indicated and signalled. Change of the position indicator (59.) after electrical opening: ...

  • Page 45: Maintenance

    Maintenance Maintenance Maintenance and servicing DANGER High voltage - danger to life! Touching live parts is fatal or causes serious physical injury. Before beginning maintenance work, note the 5 safety rules for high-voltage equipment specified in EN 50110-1, namely: • Isolate from the power supply •...
  • Page 46 Maintenance for 30 000 Optionally, the 3AK7 can be ordered with the additional order code Z = M30 for operating cycles 30 000 operating cycles. To maintain reliability during the entire operating time and...

  • Page 47: Maintenance Plan

    Annually Every 15 000 operating cycles Only the following lubricants may be used at the individual function points of the vac- uum circuit-breaker. Lubricants are available from your local Siemens agency: Order no. Bearing points and sliding surfaces: 180 g...
  • Page 48 Maintenance Overview of lubrication points Fig. 53 Bearing points and sliding surfaces of the operating mechanism  Isoflex Topas L 32  Shell Tellus oil 32 End face of the lever for the sensing device actuation (see Spring eyelet of the closing spring at the bottom (see Fig. 63) Fig.
  • Page 49 Maintenance Lubrication points with Isoflex Topas L 32 Fig. 54 End face of the lever (a) and crankpin (b) for Fig. 55 Spherical seat (c) of the spring guide of the operation of the spring state indicator and the opening spring sensing devices Fig.
  • Page 50 Maintenance Fig. 58 Bolt caps of the rapid release (g), slightly push Fig. 59 Deflection of the auxiliary switch (h) accessi- away the lever with the spacer bolts ble through the lower lateral drill hole of the operating mechanism box Fig.
  • Page 51 Maintenance Fig. 62 Stop plate and end faces of the lever of the coupling rod (l) Lubrication points with Shell Tellus oil 32 Fig. 63 Spring eyelet of the closing spring (r) at the Fig. 64 Spring eyelet of the closing spring (r) on the bottom crank arm 9229 0055 176 0B...
  • Page 52 Maintenance Fig. 65 Bearing bushings of the deflection lever (s) Fig. 66 Square of the auxiliary switch (t) Fig. 67 Bearing bushings of the circuit-breaker shaft Fig. 68 Bolts and SL retainers of the three insulating (u) left/right on the side walls connecting rods (v) 9229 0055 176 0B 2019-09-02...
  • Page 53 Maintenance Fig. 69 Opening spring bearing (w) When disassembled, the points on the pole side can also be lubricated and oiled. v, x, y v, x, y Fig. 70 Bearing points and sliding surfaces of the pole side – viewed from below ...
  • Page 54 Maintenance Special case: maintenance with the closing spring charged When the closing spring is charged, lubrication of the cam contour is easier. • Secure the pushbuttons CLOSE (53.) and OPEN (54.) with suitable means against actuation • Manually charge the closing spring with the hand crank. See Fig. 50 on page 43 •...

  • Page 55: Service Life Of The Vacuum Interrupters

    Maintenance Service life of the vacuum interrupters If switching operations occur frequently under overload or short circuit, the service life of the vacuum interrupters may be reached prematurely. Accessories and spare parts Replacing spare parts To ensure that the switchgear operates reliably, spare parts must be replaced only by trained and certified personnel.

  • Page 56: Manufacturer's Product Liability

    If the packaging is no longer needed, it can be fully recycled. Hazardous substances When delivered by Siemens, the product does not contain any hazardous substanc- es within the scope of the Hazardous Substances Ordnance applicable to the terri- tory of the Federal Republic of Germany. For operation outside the Federal Republic of Germany, the applicable local laws and regulations must be complied with.

  • Page 57: Index

    Index Index – Altitude correction factor ........28 Low-voltage interface X0 ....13 Ambient conditions ..........28 Lubricant ..............47 Anti-pumping device ..........16 Lubrication points ..........48 Areas of application ..........11 Auxiliary contactor K1 ........... 15 Manual activation –...
  • Page 58 Index Terminal strip X1 ........... 16 Transport lug ............13 Type designation ........... 27 – Undervoltage release Y7 ....... 15 transport block ..........37 Vacuum interrupter ..........13 contact stroke ..........13 contact system ..........13 service life ............55 Vacuum interrupters vacuum check ..........

  • Page 59: Central Legend

    Central legend Central legend Pole plate 68.0.1 Extended auxiliary switch S1 (12NO + 12NC) 16.1 Top post insulator 68.1 Operating rod (for auxiliary switch S1) 16.2 Bottom post insulator 68.7 Low-voltage interface X0 Pole assembly, complete 68.7.1 Plugs Top interrupter carrier 68.7.2 Terminal strip Upper terminal...
  • Page 60 Published by Siemens AG Smart Infrastructure Distribution Systems Schaltwerk Berlin Nonnendammallee 104 13629 Berlin Germany...

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