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Single-Column Pantograph DisconnectorsType TFB 123 550 kV

for Outdoor Installation

Publication No. 1HPL 700 004 En

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ApplicationDisconnectors are used for metallic isolation ofsystems by creating in the open position a visibleisolating distance.They are appropriate for switching small currentsor currents when no significant change in voltageoccurs across the terminals.Singlecolumn pantograph disconnector type TFBis appropriate for outdoor installations withconductors arranged at two different levels. Theypermit modern installation design and do notrequire much area.Optionally each disconnector pole can beequipped with an earthing switch for earthing andshort-circuiting disconnected sections of thesubstation or plant.

RegulationsThe TFB disconnectors comply with publicationIEC 62271-102; IEC 60694 and most other nationalregulations. They are available for rated voltages from170 to 550 kV.

TestsThe type tests on the disconnectors type TFB wereperformed successfully in our own and also inindependent test laboratories in accordance with thelatest regulations. During manufacture all componentsare continuously subjected to quality tests in order toensure consistent high quality of the products.After completion of the disconnector poles,comprehensive electrical and mechanical routine testsare carried out on the poles and associated operatingmechanisms so that their perfect functioning isguaranteed.

Features

Especially suitable for plant with minimal installation area.

Switching position clearly recognisable from a far distance.

High dynamic force thanks to suitable dimensioning of the pantograph and theattached damper

Reliable opening and closing even when disconnector is covered with ice

Wide catching range.

Short assembly time.

Easy adjustment thanks to the stud-bolt arrangement.

Available connections for all busbar designs.

Highest possible degree of operating safety and maintenance-free operatingdue to the welded pantograph construction.

Especially suitable for outdoor installation due to the use of aluminium orgalvanised steel parts.

Positive switching positions due to dead centre interlock

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DesignThe stable frame is carrying constructionalelement of the disconnector. It is mounted to thefoundation by means of four (3) studs andsupports the support insulator (4) withintermediate piece (6), gear box (7), and thepantograph (8), as well as the pivot bearing (9)with the rotary insulator (5) and -if available thebuilt-n earthing switch (10) with its pivot bearing(12).The top intermediate piece (6) is arrangedbetween the support insulator (4) and the gearbox (7) with the pantograph (8). It also serves asmounting point for the bottom conductor; thecables or tubes can run laterally past the switch inpiece (fig.6). Adaptation of the top intermediatepiece to the respective installation needs (e.g.equipment with 2 or 4 cable pulleys for straining ofthe cable bus bars, see fig.7) helps to reduce thenumber of structural elements and thus the workinvolved in mounting. In the case of disconnectorswitch built-on earthing switches, the earthingswitch contact is attached to the top intermediatepiece(fig.2).

The pantograph has the welded aluminiumconstruction and together with the cast aluminiumgearbox forms a mechanical unit. The constructionguarantees the highest possible degree of mechanicalstability and reliable current transfer especially in caseof the short circuit. Bolt connections are generally

avoided so that operating reliability is not impaired withtime due to the bolts working loose or by corrosion inthe joint.For balancing the weight of the pantograph in thegearbox is mounted a counterbalance spring.Because gearbox is closed on all sides the installedcomponents are protected against atmosphericinfluences, contamination and animals (e.g. birds,snakes) as well as their nests. On all four sides areprovided flat terminals offering universal connectionpossibilities. The entire transmission system has asimple mechanical design.

1. Pole of pantograph disconnector TFB 245with built in earthing switch type TEB

1 foundation (not in scope of delivery)

4 support insulator; 5 rotary insulator6 intermediate piece 7 gear box8 pantograph 10 earthing switch11 dam er 17 corona rotection fittin

3. Pole of pantograph disconnector TFB 245with built in earthing switch type TEB

2 base frame3 stud bolt

4 support insulator; 5 rotary insulator9 operating shaft12 pivot bearing

2. Top intermediate piece with earthing contacttype TEB

31 contact finger32 corona protection fitting

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Design continued

All gearbox and pantograph bearings arepermanently lubricated and thus maintenance-free.Disconnectors for high short-circuit currents areequipped with a damper. This damper is mountedbetween the pantographs joints and is to damp the

vibrations caused by the short-circuit current in thepantograph.The suspended contact is situated above thedisconnector on the overhead line and is graspedwith a high pressure, when the pantograph is inclosed position. Current is transferred through thepantograph joints by tapered roller contacts andfurther through the gearbox. These connectionshave been proven correct for many years operationunder extreme conditions in wet and cold climate,and their operating durability is considerably higherthan that of the still widely used multi-strandconductors which are more susceptible to corrosionbecause of their large surface area.

Earthing switches

The optionally available two-motion earthing switchwith its pivot bearing is attached to the disconnectorframe. The tubular contact arm is permanentlyconnected with the earthed frame by means of flexibleconnection consisting of silver-plated copper strips.

When in closed position, the earthing blade at the topof tubular contact arm lies between the contact fingersof the earthing contact, which is mounted on theintermediate piece.(Fig 2)Disconnectors for voltage 123-145 kV are equippedwith one-motion earthing switch type TEC. The tubularcontact arm is permanently connected with the earthedframe by means of flexible connection. In closedposition the contact fingers on the top of contact armlies outside the contact piece, which is mounted on theintermediate piece.(Fig. 5)

4. Gear box of TFB pantograph disconnector14 - H.V.-terminals16 operating lever17 counterbalance spring

5. Earthing switch contact type TEC (without topintermediate piece)35 contact finger36 corona protection fitting37tubular contact arm38 contact piece

16

14

17

14

35

37

36

38

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Mode of OperationEach pole of the disconnectors and earthingswitches is actuated by a separate operatingmechanism.The torque from the motor of operating mechanismis transmitted through the operating shaft and rotaryinsulator to the top bearing in the gearbox and fromthere to both pantograph arms by means ofoperating rods.

During making or breaking, before reaching its finalposition the operating lever in the gearbox travelsthrough a dead centre position, thus preventing thepantograph arms of the disconnector from openingand closing incidentally (e.g. due to breakage of therotary insulator or to vibrations caused by anearthquake).The contact strips on the pantograph arms duringmaking operation travel through a wide reach angleand that guarantees reliable grasping of thesuspended contact even if its position changesconsiderably due to the influence of adverseweather conditions (e.g. strong wind). The high

contact pressure in closed position does not onlyassure reliable current transfer but also reducescontact wear. Due to the scissors action whenmaking and breaking the forces acting on thecontacts of the disconnector are concentrated on asingle point so that even thick layers of ice can beeasily broken and removedThe design of the disconnector prevents formation ofice block between the pantograph and gearbox.The corona protection fittings attached to thepantograph arms also serve as a catching device incase of vertical movement of the suspended contactand thus preventing the suspended contact from

slipping out of the pantograph arms.

Operating MechanismsAll disconnectors can be supplied with manualoperating mechanism or motor-operated mechanismaccording to the clients request. The operatingmechanisms are fastened laterally below the baseframe within easy reach from the ground level.

InterlocksAt the client's request the disconnector and earthingswitch can be interlocked with each other so that theearthing switch can be operated only when thedisconnector is in the open position and thedisconnector can be operated only when the earthingswitch is in the open position.Disconnectors with motor-operated mechanism can beelectrically interlocked.As the additional interlocking facility operatingmechanisms can be equipped with the blockingmagnet, which prevents any operation of the manualoperating mechanism or emergency manual operationof motor operated mechanism if there is no actuating

signal from the control room. This enables thecentralised supervision over all manual operations ofdisconnectors and earthing switches in the wholesubstations.

Little MaintenanceDisconnectors are practically maintenance-free due tothe selection of the materials used and the design, forexample covering of the gearbox and use of bearingswith permanent lubrication. Inspections andmaintenance are mainly limited to componentsexposed to atmospheric influences and cover forexample cleaning the insulators. Under normal climaticconditions the inspection intervals are 5 years.

6. Suspended contact (standard design)21 contact tube22 aluminium clamp

7. Suspended contact (for switching commutationcurrents and installation onto tube bus-bar)23 busbar tube24 conductor ring25 housing of switching chambers

21

22

23

24

25

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Main dimensions and weights

Main dimensions TFB 123 TFB 145 TFB 170 TFB 245 TFB 300 TFB 362 TFB 420 TFB 420-1 TFB 550

Earthing switch type: TEC TEC TEC TEC TEC TEB TEB TEB TEB

Height of disconnector(CLOSED)

mm 3930 4210 5640 6240 6590 7460 7910 8540 10610

B Distance to suspended contact mm 3500 3780 5080 5680 6030 6900 7350 7970 9710

C Minimum isolating distance mm 1400 1400 2300 2300 2300 2950 2950 3500 4200

D Width of disconnector (OPEN) mm 1990 1990 2960 2960 2960 3560 3560 4160 5260

E Catching range mm 300 300 400 400 400 400 400 400 500

F Height of insulator mm 1220 1500 1700 2300 2650 2900 3350 3350 4000

G Envelope, top mm 170 170 260 260 260 260 260 260 330

H Envelope, bottom mm 580 580 840 840 840 840 840 840 950

K Earthing switch (OPEN) mm 1100 1300 1230 1830 2180 2430 2980 2980 3730

L Earthing switch counterpoise(OPEN)

mm - - - - - 1030 1030 1030 1030

Weights

Disconnector3-pole group

1)2)

kg 890 980 1070 1340 1500 1750 1950 2100 2350

Built-on earthing switch3-pole group

kg 80 80 80 80 80 440 440 440 440

1) Including operating mechanisms

2) Including standard insulators

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HAPAM Poland Sp. z o.o.22/24 ks. bp. W Tymienieckiego Street90-349 Lodz, POLANDTel. +48 42 663 54 50Fax. +48 42 663 54 97

www.hapam.pl