Installation, SF6 Multifunctional Compact Prefabricated Device Commissioning, for Electric Power Station up to 170kV Maintenance Instruction type PASS M0 SBB 2GJA700101 (E) / rev. F / 02.2007

AAABBBBBB

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Copyright

We reserve all rights to this document and to the object described therein. The recipient of this document recognizes these rights and will not without our prior written approval make this document available either in part or in whole to any third party or use it for any purpose other than that for wich it was presented to him. © ABB PT S.p.A

Address ABB PT S.p.A U.O. Adda Via dei Ceramisti 26900 Lodi – Italy tel. +39 0371 452.1 fax +39 0371 452.222 internet : http://www.abb.it

Notes These instructions describe high-tech high voltage products, and are specifically aimed at explaining the use of such products. These instructions are not meant to replace valid regulations, concerning high voltage systems and appliances, and are intended for use by specialists in the electricity field.

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CONTENT 0. 1. 2. 3. 3.1. 3.2. 3.2.1. 3.2.2. 3.3. 3.3.1. 3.3.2. 3.4. 3.4.1. 3.4.2. 3.5. 3.5.1. 3.6. 3.6.1. 3.7. 3.8. 4. 5. 6. 6.1. 6.2. 7. 8. 9. 10. 10.1. 10.2. 10.3. 10.4. 10.5. 10.5.1. 10.5.2. 10.5.3. 10.6. 10.7. 10.8. 11. 11.1. 11.2. 12. 13. 14.

BASIC DOCUMENTATION..................................................................................................................................... INTRODUCTION…………………………………………………………………………………………………................. MAIN FEATURES AND ADVANTAGES OVER CONVENTIONAL DEVICES……………………………............... DESCRIPTION OF DEVICE………………………………………………………………………………….….................Accessories for PASS M0 SBB Circuit Breaking Chamber General Description Combined disconnector Busbar Side General Description Disconnector Line Side General Description SF6/Air Bushings Description Current transformer Description BLK222 Type Motor Charged Spring Operating Device Disconnector drive RUPTURE DISC……………………………………………………………………………………………….…................ DENSITY SWITCH………………………………………………………………………………………………................. CABINET…………………………………………………………………………………………………………................. General Description SHIPPING…………………..……………………………………………………………………………………................. INCOMING CHECK……………………………………………………………………………………………….............. STORAGE………………………………………………………………………………………………………….............. INSTALLATION……………………………………………………………………………………………….…................ Introduction Fixing Vertical Pedestals (if applicable) Positioning and Assembling the main shipping Unit Rotating the Side Poles Assembling the Driving Gears on the Side Poles Circuit Breaker Combined Disconnector Disconnector/Earthing Switch Laying the L.V. Cables and Connections Connecting the earth Cables Filling at Rated Pressure of SF6 CHECKS TO BE MADE AFTER ASSEMBLY AND COMMISSIONING………………………………….................. Apparatus for site test Special tools SPARE PARTS, LOGISTIC, TOOLS……….……………………………………………………………….…............... PREVENTIVE MAINTENANCE GUIDE………………………………………………………………………................ TORQUE WRENCH SETTING FOR BOLT AND STUD.........................................................................................

page 5 page 6 page 6 page 6 page 8 page 8 page 8 page 9 page 9 page 9 page 10 page 12 page 12 page 12 page 12

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Content of figures fig. 1 Circuit Breaking Chamber…………………………………………………………............… pag. 13fig. 2 Combined Disconnector………………............…………………………..…………………. pag. 14fig. 3 Disconnector/Earthing Switch…...................……………………………………………… pag. 15fig. 4 SF6 / air bushing...…………………………………………………………………….............. pag. 16fig. 5 Current Transformer........................................................................................................ pag. 17fig. 6 Indicator of disconnector drive……………………………………………………………… pag. 18fig. 7 Assembly density switch to C.B……………………………………………………………. pag. 19fig. 8 Shipping............................................................................................................................ pag. 20fig. 9 Fixing vertical pedestals................................................................................................. pag. 21fig. 10 Regulating nut.................................................................................................................. pag. 22fig. 11 Positioning PASS M0 SBB.............................................................................................. pag. 23fig. 12 Assembling PASS M0 SBB............................................................................................. pag. 24fig. 13_1 Rotating the side poles................................................................................................... pag. 25fig. 13_2 Rotating the side poles……………………………………………………………………….. pag. 26fig. 14_1 Main shaft of Circuit Breaker.................……………....................................................... pag. 27fig. 14_2 Indicator of C.B. .............................................................................................................. pag. 28fig. 15 Shaft of Combined Disconnector………………............................................................. pag. 29fig. 16 Connecting rods of Disconnector/Earthing Switch..........................................………. pag. 30fig. 17 Laying the low voltage cables……………………………………………………………….. pag. 31fig. 18 C.T. connections……………………………………………………………………………….. pag. 32fig. 19 Connecting the earth cables…………………………………………………………………. pag. 33

Content of tables tab.

1

Basic Documentation………………………………………………………………… pag. 5

2GJA700101 (E) / rev. F / 02.2007 5 / 34

0. BASIC DOCUMENTATION The complete operating instructions for a SF6 Multifunctional Compact prefabricated Device type

PASS M0 SBB consists of the Basic Documentation and the supplied documentation. The scope of delivery is installation-specific. A complete set for this installation contains the following documents:

Title Volume-number

Installation, Commissioning and Maintenance Instruction type PASS M0 SBB

2GJA700101 (E)

Layout and Single Line Diagram

…………………………………..

MOTOR CHARGED SPRING OPERATING DEVICE TYPE BLK 222

FM 431E

or 2GJA700130 (E)

DENSITY MONITORS for SF6 GAS

MDS 100 / ex

ASSEMBLYING PROTECTION

2GJA700197 (I/E)

DISCONNECTOR DRIVE BES7

2GJA700275 (E)

RUPTURE DISC

2GJA700269 (E)

Description for operations of rotation of lateral poles

FD 595 I/E

SF6 GAS INSULATED SWITCHGEARS Sulphur Hexafluoride Handling Instruction

FD 217-E

OPERATIONAL INSTRUCTION FOR STORAGE AND PRESERVATION OF SF6 MULTIFUNCTIONAL PREFABRICATED HYBRID DEVICE

2GJA700116 (E)

SPARE PARTS, LOGISTIC, TOOLS

2GJA700227 (E)

Preventive Maintenance Guide

FM 492

TORQUE WRENCH SETTING FOR BOLT AND STUD

FD 626E

tab.1

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1. INTRODUCTION The PASS M0 SBB is a compact multifunctional unit (see Layout and Single Line Diagram) consisting of a limited number of subassemblies designed and tested at the factory and transportable to the site where it may be installed rapidly and safely. 2. MAIN FEATURES AND ADVANTAGES COMPARED TO CONVENTIONAL DEVICES - reduced weight and dimensions; - reduced amount of SF6 inside the active parts; - fewer necessary building works; - reduction in major maintenance operations; - easier to install; - easier of maintain. 3. DESCRIPTION OF DEVICE The PASS M0 SBB (see Layout) consists of three separate switching poles, with the circuit breaking chamber set horizontally. The combined disconnectors (bus-bar/earth) are housed inside the casing of each switching pole, where Busbar could be separate from Line by means a gas barrier. The BLK222 drive controls the three switching poles; the BES7 drive controls the Combined Disconnector and the Disconnector/earthing switch. The SF6/air bushings, for the connection with the overhead lines and busbar system, are installed at the input/output. On request, these bushings may be fitted with multi-ratio conventional current transformers with several windings. All the equipment is normally assembled on two frames. The control cabinet is also fitted to one of these frames, under standard installation conditions. 3.1. Accessories for PASS M0 SBB The PASS M0 SBB is provided with the following accessories (assembled on each pole): two - DN8 gas inlets, for filling and control; one - rupture disc (one+one rupture disc in presence of insulator barrier); one - inspection window for checking the position of the mobile contact of Combined Disconnector; one - inspection window for checking the position of the mobile contact of Disconnector/Earthing Switch; The PASS M0 SBB is provided with the following accessories (assembled on the unit): one - density switch with three contacts (I) (one+one density switch in presence of insulator barrier): one contact for alarm, two contacts for lock. This instrument provides pressure indication in bars/MPa or in coloured sector and measures the effective density of the SF6 gas irrespective of changes in room temperature, because the instrument is equipped with a temperatur compensation system one - three-pole device for signalling the position of the circuit breaker: red-closed/green-open; one - three-pole device for indicator position of the combined disconnector:red closed/green-open; one - three-pole device for indicator position of the disconnector/earthing switch:red closed/green-open; 3.2. Circuit Breaker Chamber 3.2.1. General The circuit breaker chamber used in the PASS M0 SBB device is of the self-blast type. The energy required for closure is stored in the coil spring of the BLK222 drive (see document FM 431E or 2GJA700130E). The opening springs are located inside each pole; they are loaded with the switch closed and are therefore always ready to provide the energy required for opening the switch.

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3.2.2. Description (fig.1) The circuit breaker chamber housed inside the cylindrical casing consists essentially of: - involucre (1); - fixed contact (2) connected to the mobile contact of the combined disconnector; - mobile contact (3); - blow nozzle (4); - contact spring (5) - switching fingers (6); - upper shield (7); - lower shield (8); - support insulating cylinder (9); - drive rod (10); - opening spring (11); - dehydrators (12); - bushing coupling terminal (13); - rupture disk (14); - port hole (15); - barrier insulator (16). 3.3. Combined Disconnector (fig.2) 3.3.1. General The PASS M0 device is equipped with a combined three-pole disconnector. When the mobile contact (1) rotates 90° (180° to 90°), the bus-bar side disconnector opens; and closes to earth after another rotation of 90° (90° to 0°) of the circuit, on the circuit breaker side. 3.3.2. Description The combined disconnector consists essentially of the mobile contact (1), the fixed contacts (2) and earth side (4), rotating insulator (5), fixed chamber support (6), chamber shield (7), rotating insulator shield (8), earth side cover (9), port hole (10), seals (11), drive side cover (12) and bearing (13). 3.4. Disconnector/Earthing switch (fig.3) 3.4.1. General The C.B. device is equipped also with a disconnector/Earthing Switch. The rotation of main contact, of 45° (90° to 45°) determine the opening of the disconnector line side and closes to earth after another rotation of 45° (45° to 0°) of the circuit, on the circuit breaker side. 3.4.2. Description The three-pole disconnector consists essentially of: mobile contact (1); fix contact side C.B. (2); rotating insulator (3); rotating insulator shield (4); covering (5); port hole (6); seals (7); drive side cover (8); bearing (9). 3.5. SF6/Air Bushings (fig.4) 3.5.1. Description The SF6/air bushings consist of a robust internal cylinder (1) with epoxy resin impregnated fibre-glass, which serves the function of withstanding mechanical load (internal pressure, cantilever operating load, etc.).

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The base flange (2) and the lid (3), are fixed to this cylinder by means of a heat treatment and gluing process. The terminal (4) is screwed to the outer part of the lid and the primary bus bar (5) is to the inner part. The silicone rubber (6) is moulded on the outside of this cylinder and binds with the fibreglass cylinder to form a single component, prevent the risk of contamination between the two materials. The main characteristics of these insulators are: - extreme safety in that there is no risk of explosion; - excellent performance, in the case of a polluted environment and the presence of rain; - resistance to sand storms; - low weight; - no maintenance required. 3.6. Current Transformer (fig.5) 3.6.1. Description It consist of a metal casing (1) which contains the core (2) immersed in resin (3), the seal (4), fixing cover (5), tinned copper plat (6), data plate (7), plate P… (8), cable glands (9), secondary terminal box (10), resin (11), schema plate (12), terminal (13). The primary circuit consists of the bus bar inside the SF6/air bushing 3.7. BLK 222 Type Motor Charged Spring Operating Device (see document FM 431E or 2GJA700130E) 3.8. Disconnector Drive (see document 2GJA700275 E & fig.6) 4. RUPTURE DISC (see document 2GJA700269 E) 5. DENSITY SWITCH (SEE DOCUMENT MDS100/EX) (see assembly of density switch on C.B. : figure 7) 6. CABINET 6.1. General All command and control apparatus of PASS M0 SBB are flowing together to only one cabinet. 6.2. Description Inside the cabinet are fitted all apparatus for command, control and signalling, as following description: - push_buttons to operate the disconnectors - push_buttons to operate the circuit breaker and signalling of their position, - the allarms of SF6 minimum pressure, not manoeuvrability and various anomalous situations of disconnectors; circuit breaker and heating circuit, - circuits for automatism joined with alarm functions, block and signalling, - connecting terminals to existing panels of customer, - the relays for pilotage of motors that controls disconnectors and circuit breaker, - heating circuit of module and cabinet, - connecting terminals to existing panels of customer for amperometering and voltametering circuits.

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7. SHIPPING (fig.8) The PASS M0 SBB is completely tested at the factory. The mechanical and dielectric tests are carried out on the whole module completely assembled. The PASS M0 SBB device is shipped with the circuit breaker open and with its closing springs unloaded, and the disconnectors closed on the earth side. In standard configuration the poles are already conditioned and filled with SF6 gas at a reduced pressure of 0.02-0.03 MPa rel. at 20°C. The weight of the transport unit is about 2100 kg (structure 450 kg). Warning: do not operate the circuit breaker at this low pressure. Only operate the circuit breaker when the pressure is over the value of lock out (see Single Line Diagram). At the end of the factory test, the driving gears are removed from the side poles of the circuit breaker, the combined disconnector and the low voltage circuits of the cabinet are disconnected. The side poles are rotated 30° and set in a vertical position. The maximum height is less than 2700 mm and the width is less than 2200 mm; the PASS M0 SBB module may therefore be carried by any means of transport. The remaining parts completing the device, such as the control cabinet, the supporting structure, the tools and any spare parts, are much smaller than the module, and therefore present no particular transport problems. 8. INCOMING CHECK On receipt of the material, check the entire module, in particular the density switches, the controls of the circuit breaker and disconnector and the bushings. Check that the equipment shows no signs of breakage or tampering. If any problems are found, inform the Shipping office of ABB PT U.O. Adda, immediately. 9. STORAGE If the equipment is stored before assembly, it must be kept in a covered, dry place. If this equipment is stored outside, it must be placed in a dry, drained place and all packages must be covered with tarpaulins. The integrity of the packages and their covers must be checked periodically (see 2GJA700116 (E)).

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10. INSTALLATION 10.1. Introduction The main operations to be performed to install this equipment are: - check the necessary building works (if to be assembled on plinths or a platform made of reinforced

concrete); - fix two vertical frames by means of chemical or expansion plugs to the reinforced concrete plinths (if

present); - position and assemble the main shipping unit; - rotate side poles by 30° - assemble driving gears on side poles of the circuit breaker and combined disconnector; - connect L.V. cables; - connect earth cables; - fill with SF6 at rated pressure. 10.2. Fixing the Vertical Pedestal (if applicable fig.9) Having checked the foundation works (A), the supporting structure, completely preassembled at the factory and complete with cabinet (B), may be set in position using a crane (weight of structural work including the cabinet and cables: 450 kg). Make the four holes, for each frame, on the foundation plinths once it has been checked that they are perfectly aligned. The distance between the vertical frames is determined by the steel braces (1). In addition, it is very important to check the planarity of the two frames. If the building works are not correctly executed, as regards their planarity, use may be made of the fixing plugs for regulating the height of the pier (as shown in fig.10) by regulating the nut (1) to level the base plate. Once the operations have been completed, fill the space below the base plate. In any case, the tolerance limits indicated in fig.9 must be strictly observed. Having drilled the eight holes (four for each plate), as indicated in fig.9 the rigid structure may be definitively fixed to the plinths. All the specifications mentioned previously are applicable even when the supporting structural work and the cabinet are transported separately. 10.3. Positioning and Assembly the main shipping unit Lift the module using a crane, as indicated in fig.11 weight of module 1800 kg (Note: all lifting accessories such as belts, shackles, eyebolts, belt tighteners etc. are NOT included in the supply). Move it close to the vertical frames shown in fig.12 taking care to align the 4 front slots φ 20 x 30 and rear ones located on the U channel of the module, with the corresponding slots on the vertical frames. Insert the eight M16 bolts and tighten their nuts with a torque of 140 Nm. Completely release all the lifting accessories. 10.4. Rotating the Side Poles (fig.13_1, fig. 13_2) Full description is described in document FD595 I/E. 10.5. Assembly the Driving Gears on the Side Poles 10.5.1. Main shaft of Circuit Breaker (fig.14_1, fig.14_2) Full description is described in document FD595 I/E. 10.5.2. Shaft of Combined Disconnector (fig.15) Full description is described in document FD595 I/E. 10.5.3. Connecting rods of Disconnector/Earthing Switch (fig.16) Assemble, to U channel, the square tube bearing the drives BES7, with the respect of the pins. The PASS M0 SBB is shipped with the disconnector closed and the transmission rods (1) on one side from their relative lever (2), while the regulation flanges (3), joined with the internal insulators shafts (4) are fixed by two lever-block (5) that prevent internal movements during the transport. After installing the PASS M0 and poles rotation procedure, in accordance with paragraph 10.4, proceed as follows:

2GJA700101 (E) / rev. F / 02.2007 11 / 34

1) The rods (1) have to be coupled with their pins, keeping the regulation flanges (3) still, preventing them to rotate from the original position;

2) After the coupling, move the disconnector in earth-position, with the driving lever in end-stroke position

(7); 3) Verify through the inspection port hole that the disconnector moving contacts are equally inserted in their

fix contacts; in case loosen the two M10 nuts (6), relative the contact, and rotate the regulation flange (3) to achieve correct positioning. Tight the two M10 nuts (6); 4) With manual operation close the disconnector in busbar position and verify, in the same way, all moving

contacts are equally inserted in their fix contacts; 5) If further setting is necessary loosen the two M10 nuts (6) and rotate the regulation flange (3), relative

the moving contact to achive correct positioning, tight the two M10 nuts (6); 6) Drill (8) Ø5 (+0 / +0,12) and pin all the three flanges with spring pins 5x20 (item SA20/0520) supplied. 10.6. Laying the L.V. Cables and Connections (fig.17) In the standard conditions, the cables are completely connected on the cabinet side and are equipped at the other end. Only the cables of the current transformers have no connector. Remove the lids of the cable channels already fixed to the transportable assembly unit of the PASS M0 SBB device; insert and lay the cables tidily inside the channels, avoiding excessive bending and tugging of the cable before replacing the lids on the channels; tie the cables together with bands. The cables with a connector bear a label on the mobile part, with the abbreviation of the connector. This abbreviation is also indicated on the fixed part to which this connector will be connected. See the electric scheme for the names of the L.V. circuits. To connect the C.T. (fig.18), remove the cover (1) by unscrewing the screws (2), unscrew the cable gland (3), insert the cable from which a suitable length of the shield has been removed; connect the wires as indicated in the circuit diagram choosing the desired ratio; tighten the cable clip securely, and replace the lid. Repeat this operation for all current transformers present. 10.7. Connecting the Earth Cables (fig.19) The two vertical frames must be connected to the earth with at least M12 bolts (1). Check the presence of the earth cable (2) on the control cabinet, on the circuit breaker box (3) and C.T. (4). 10.8. Filling at Rated Pressure of SF6 (see document 2GJA700226 E) If the reaches the pressure is effected on density switch is not necessary to do some correction. If reading is done with sample pressure gauge it need do a correction of filling pressure, working of ambient temperature. So for different temperatur by 20°C the filling pressure, for PASS M0 SBB, it will be as the table 1 of the instruction FD217-E

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11. CHECKS TO BE MADE AFTER ASSEMBLY AND COMMISSIONING The PASS M0 must undergo the following checks before placing in service Warning: PASS M0 must not be operated without full SF6 gas pressure. Set: The circuit breaker in O-C position 5 times; The disconnector in O-C position 3 times; The earthing switch in O-C position 3 times; To perform these operations electrically from the local module controlgear, set the selector S43 in the “Local” position. To perform disconnector manually, set the selector S43 in the “Manual” position. The interlocks were already tested at the factory but we recommend you repeat this operation on the site. 11.1. Apparatus for site tests (not included in the supply) - power supply 0-150 Vcc min 16 Amps; - time measurement for CB (opening/closing); - micro-ohmmeter 100-200 Amps, for resistences measurement; - dielectric insulation test 2kV for auxiliary circuit; - SF6 filling equipment (min. 36 kg SF6). 11.2. Special tools (included in the supply) - one crank for changing spring of drive BLK222, located inside the control cabinet; - one tool for turn the main shaft of C.B.; - one crank for turn disconnecotor drive BES7; 12. SPARE PARTS, LOGISTIC, TOOLS (see document 2GJA700227 E) 13. PREVENTIVE MAINTENANCE GUIDE (see document FM 492) 14. TORQUE WRENCH SETTING FOR BOLT AND STUD (see document FD 626 E)

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Circuit Breaking Chamber fig. 1

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Combined Disconnector fig. 2

1. mobile contact 2. fixed contact bus barsidefixed contact earth side

4. fixed contact earth side 5. rotating insulator 6. fixed chamber support 7. chamber shield 8. rotating insulator shield 9. earth side cover 10. port hole 11. seals 12. drive side cover 13. bearing

2GJA700101 (E) / rev. F / 02.2007 15 / 34

Disconnector/Earthing Switch fig. 3

1. mobile contact 2. fixed contact side C.B. 3. rotating insulator 4. rotating insulator shield 5. covering 6. port hole 7. seals 8. drive side cover 9. bearing

Earthing switch side bushing

Earthing switch side C.B.

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SF6 / air bushing fig. 4

1. reinforced cylinder made of glass, aramid and polyester endless fibres 2. base flange 3. lid 4. terminal 5. primary busbar 6. silicone rubber

2GJA700101 (E) / rev. F / 02.2007 17 / 34

ABBABB

Current transformer *) for connections see electrical scheme fig. 5

1. metal casing 2. core 3. resin 4. seal 5. fixing cover 6. tinned copper plat 7. data plate 8. plate P.. 9. cable glands 10. secondary terminal box 11. resin 12. schema plate 13. terminal *)

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Indicator of disconnector drive fig. 6

2GJA700101 (E) / rev. F / 02.2007 19 / 34

Assembly density switch to C.B. fig. 7

20 / 34

Shipping fig. 8

2GJA700101 (E) / rev. F / 02.2007 21 / 34

Planarity ±1

Cross steel brace

Aligment ±1

±1

Chemical screw anchor

Fixing vertical pedestals fig. 9

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ba

se p

late

n

ut

Regulating nut fig. 10

2GJA700101 (E) / rev. F / 02.2007 23 / 34

Positioning PASS M0 SBB fig. 11

24 / 34

Assembly PASS M0 SBB fig. 12

X

4 S

LOTS

ø 2

0x30

4 BO

LTS

M16

3070

80

80

1400

1500

650

150

750

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2GJA700101 (E) / rev. F / 02.2007 25 / 34

1. metal square 3. pivot 4. threaded rod 5. washer 6. nut 7. split 9. higher nut 10. bolt M16 11. bolt M16 12. hole 13. dowel pin 15. support pole 16. beam C

Having fixed the module on the frames, the lateral phases may be widened simply by turning the poles by an angle to 30°. WARNING : check that the C.B. is in the open position and the BLK drives prings are unloaded. a) Taking away the bolt M16 (10) and lightly loosen the bolt M16 (11). b) By means of a spanner turn with anti-clockwise rotation, AND WITH SYNCHRONISM, the two higher nuts (9), of

the two (or one) threaded rods (1), until that the two holes (12), one on the support of the pole (15) other on the beam C (16), are lined up. The nuts (9) must be greased.

c) Reassemble the bolt (M16), in the position (12), without tighten it. d) Find alignment of the pin holes, between support of the pole (15) and beam C (16), whose dowel pins (13) are

predisposed. e) Penetrate the two pins (13), equitably, and tighten the bolt M16 (12) and the bolt M16 (11) : couple 180Nm. f) Carry on with only the point 4). g) Pass, then, to assembling C.B. gears.

Rotating the side poles fig. 13_1

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Rotating the side poles fig. 13_2

1. threaded rods for shipping and turnig poles 2. screw to lock 3. screw to rotate

2GJA700101 (E) / rev. F / 02.2007 27 / 34

11

22

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33

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Main shaft of Circuit Breaker fig. 14_1

28 / 34

Indicator of C.B. fig. 14_2

2GJA700101 (E) / rev. F / 02.2007 29 / 34

Shaft of Combined Disconnector fig. 15

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30 / 34

2

1

2

1

3

4

8

5

3

5

4

6 7

Connecting rods of Disconnector/Earthing Switch fig. 16

2GJA700101 (E) / rev. F / 02.2007 31 / 34

Laying the low voltage cables fig. 17

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C.T. connections fig. 18

1. cover 2. screws 3. cable gland 4. terminals

2GJA700101 (E) / rev. F / 02.2007 33 / 34

Connecting the earth cables fig. 19

1. Vertical frame 2. earth for control cabinet 3. drive covering of circuit breaker 4. C.T. (see figure 5) Minimum Earth Bolt Size = Ø12

INFORMATIVE

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AABBBB

AABBBB PPTT SS..pp..AA UU..OO.. AAddddaa VViiaa ddeeii CCeerraammiissttii 2266990000 LLooddii -- IIttaallyy tel. +39 0371 452.1 fax. +39 0371 452.222 e-mail : abb-adda.itadd@it.abb.com internet : http://www.abb.com/it