air-insulated withdrawable switchboard - neopet-bg.com instruction... · fig 3a - busbar coupling...

Air-insulated withdrawable switchboard

Medium Voltage Switchgear __________________________________________________________________________________________________________

__________________________________________________________________________________________________________

Instruction Manual MVRD30024A

Dispatch Installation

Start-up Operation

Maintenance

2

Contents

1. Description 1.1 Safety Precautions.............................................................................................….. Page 4 1.2 Technical Characteristics..................................................................................….. Page 5 1.3 Electrical Characteristics...................................................................................….. Page 5 2. Cubicles of Normacel range..........................................................................…………. Page 6 3. Instructions for Erection and Installation 3.1 Transport...........................................................................................................….. Page 13 3.2 Dispatch............................................................................................................….. Page 14 3.3 Handling............................................................................................................….. Page 15 3.4 Storage..............................................................................................................….. Page 17 3.5 Installation.........................................................................................................….. Page 17 3.5.1. Connecting cables...............................................................................….. 1 3.5.2. Fastening Cubicles together................................................................….. Page 21 3.5.3. Assembly of end panels at the side end cubicles................................….. Page 22 3.6 Connections

3.6.1. Connecting busbars.............................................................................….. Page 23 3.6.2. Connecting the earthing circuit between cubicles...............................…. Page 28 3.6.3. Connecting the earthing circuit at the side ends of the switchgear.....….. Page 28 3.6.4. Connecting MV cables........................................................................….. Page 29 4. Start-up 4.1 General..............................................................................................................….. Page 31 4.2 Putting into operation........................................................................................….. Page 32 5. Operation 5.1 Cubicle Control Panel .........................................................................................…. Page 33 5.2 Operation of the Circuit Breaker Compartment 5.2.1. Circuit Breaker Operation in the Cubicle 5.2.1.1 Putting the circuit breaker withdrawable part into operation….. Page 33 Interlockings.........................................................................…… Page 34 Operation Sequence..............................................................…… Page 35 5.2.1.2 Putting the circuit breaker withdrawable part into test position... Page 35

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5.2.2. Circuit breaker operation out of the Cubicle 5.2.2.1 Putting the circuit breaker withdrawable part into the Cubicle… 5 Operation Sequence..................................................…………… Page 35 5.2.2.2 Putting the circuit breaker withdrawable part out of the

Cubicle.…………………………………………………………. Page 37

Operation Sequence................................................................….. Page 37 5.2.3. Interlock for draw out/insertion of the circuit breaker withdrawable part.. Page 37 5.2.4. Manual reset (Help Control)....................................................................... Page 37 5.3 Operating the voltage transformer compartment 5.3.1. Withdrawable Voltage Transformers.......................................................... Page 39 5.3.1.1 Putting withdrawable voltage transformers into service

position…………………………………………………………. Page 39

5.3.1.2 Putting withdrawable voltage transformers into test position...... Page 40 5.3.1.3 Replacing fuses.......................................................................…. Page 41 5.3.2. Fixed Voltage Transformers....................................................................... Page 42 5.4 Operation of the Earthing Switch ........................................................................... Page 43 Operation sequence to close the earthing switch...................................................... Page 44 Operation sequence to open the earthing switch....................................................... Page 44 6. Maintenance 6.1 Cleaning the circuit breaker poles....................................................................….. Page 44 6.2 Changing the transformation ratio of the current transformers.........................….. Page 44 6.3 Replacing a voltage Transformer fuse..............................................................….. Page 45 6.4 Cleaning and lubrication........................................................................................... Page 45 6.5 Checking the condition of the earthing switch ........................................................ Page 46 7. Accessories 7.1 Lever for earthing switch operation....................................................................…. Page 46 7.2 Handle for insertion of withdrawable parts: Circuit breaker and Voltage

Transformers………………………………………………………………………. Page 46

7.3 Keys for interlocking the earthing switch, withdrawable part (optional)................. Page 46 7.4 Transport carriage for circuit-breakers..................................................................... Page 47 7.5 Lever for circuit breaker manual reset...................................................................... Page 47

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1. Safety Precautions

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This equipment can be remote controlled and contains current-carrying parts and mechanical elements moving at high speed. The non compliance with these safety precautions may result in severe physical and property damages.

• Carefully read this manual before proceeding to any handling, operation or maintenance action. • The equipments described in this manual have been designed and tested to operate within their rated

values. Their use out of those values may result in maloperations which may cause severe physical and property damages.

• In the cubicles with withdrawable circuit breakers: -Never proceed to checking’s on the circuit breaker control (in the cubicles with circuit breakers)

when it is closed or when the locking springs are charged. The circuit breaker should be open and the locking springs should be discharged. (See DIVAC Instruction Manual, Tab I-A)

- Always leave the circuit breaker either on Service or Test Position, and never in an intermediate

position in the cubicle. - Do not use the circuit breaker as the only way to break the circuit in service. Place it also on test

position. - Withdraw the circuit breaker from the cubicle before proceeding to any maintenance action. • The good performance and the life time of the circuit breaker depend on its correct application,

installation and maintenance. Check that these operations are carried out by qualified personnel only, duly aware of precautions and instructions contained in this manual and acquainted with installation and maintenance of Medium Voltage nets and equipments.

• The circuit breakers are equipped with several security interlocks allowing a simple and safe use. Do

not force them. • This manual should be easy to access by everyone connected to installation, operation and

maintenance of the equipment.

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1.2 - TECHNICAL CHARACTERISTICS

Electrical Rated voltage 7,2 - 12 - 17,5 kV Insulation level Impulse 95 kV

Power frequency 38 kV - 1 minute

Frequency 50 Hz Rated current of busbar 630 to 3150 A Rated current of tee-offs 630 to 3150 A Rated peak withstand current 40 - 100 kA Rated short-time withstand current 16 – 40 kA (1 or 3 s)

Mechanical Protection degree (IEC 529) IP3 (IP4 under request) Enclosure High quality multifolded 2 mm aluminium galvanised stell

sheet sections bolted together. The doors and the side wall cladding are electrostatically coated witn an epoxy-polyester primer and then stove enamelled.

Standard colors RAL 7032 RAL 7026 (front control panel)

Normal service conditions Minimum ambient temperature -5 °C Maximum ambient temperature 40 °C Maximum 24 h average temperature 35 °C Maximum relative humidity 95 % Maximum site altitude 1000 m

Applicable standards CEI 298, 694, 517, 529, 56, 129 (BS standards also applicable)

Dimensions Height (H) 2100 mm Depth (D) 1500 mm Width (W): - Tee-off current up to 1250 A - Tee-off current up to 2500 A - Tee-off current up to 3150 A

700 mm 850 mm 1000 mm

1.3 - ELECTRICAL CHARACTERISTICS

Rated Voltage

Impulse Power frequency

(1 min.)

Rated current

Rated short-circuit

breaking current

Rated voltage

Impulse Power frequency

(1 min.)

Rated current

Rated short-circuit

breaking current

kV kV kV A kA kV kV kV A kA 630 630

1250 16 1250 16

630 630 1250 1250 1600 1600 2000 2000 2500

25

2500

25

630 630 1250 1250 1600 1600 2000 2000 2500 2500

12 75 28

3150

40

17,5 95 38

3150

40

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2 - Cubicles of Normacel range Incoming/Outgoing Cubicle Legend:

A - Busbar compartment 6 - Cables B - Circuit-breaker compartment 7 - Internal arc cover C - Cable compartment 8 - Shutter D - Low voltage compartment 9 - General busbar 1 - Circuit-breaker 10 - Tee-offs 2 - Busbar support 11 - Voltage Capacitor Divider 3 - Bushing 12 - Earthing switch control 4 - Current transformer 5 - Earthing switch

Fig 1 - Incoming/Outgoing Cubicle

700 1500

2100

Front View Lateral View

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Fig 2 - Incoming/Outgoing Cubicle optionally with withdrawable cables VT’s, with withdrawable busbar VT’s and with cables CT’s

Fig 3a - Busbar Coupling Cubicle optionally with withdrawable VT’s at the two half busbar

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Fig 3b - Busbar Coupling Cubicle optionally with busbar Earthing Switch and with Voltage

Indicators

Fig 4a - Busbar Rising Cubicle optionally with CT’s

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Fig 4b - Busbar Rising Cubicle optionally with CT’s, with busbar Earthing Switch and with

Voltage Indicators

Fig 5 - Metering Cubicle optionally with Surge Arrester, with Earthing Switch and with Voltage Indicators

10

Fig 6 – Fuse Switch Feeder Cubicle

Fig 7 – Direct Incoming/Outgoing Cubicle optionally with cables CT’s and with Earthing Switch

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Fig 8a – Double Tier Cubicle (Un=12kV) optionally with withdrawable Vacuum Circuit

Breaker or with withdrawable Vacuum Contactor

Fig 8b – Incoming Cubicle (Un=12kV) suitable to the Double Tier Cubicle on busbar

compartment level optionally with withdrawable cables VT’s

Note: The Busbar Coupling and the Busbar Rising Cubicles with this busbar compartment configuration are available.

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Fig 9 - Incoming/Outgoing Cubicle with busbar CT’s and with cables CT’s. Optionally for this solution is available the withdrawable cables VT’s and the withdrawable busbar VT’s (see Fig 2).

Note: The Busbar Coupling and the Busbar Rising Cubicles with this busbar compartment configuration are available.

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3- INSTALLATION AND ERECTION INSTRUCTIONS

3.1- Packing information The cubicles will normally be packed for truck or container transport.

Fig 10 – Special packing Fig 11 – Standard packing Dimensions and weights:

External packing dimensions (mm)

Cubicles type

In (A)

W H D

Weight (kg)

Incoming/Outgoing 750

Direct incoming 500

Bus section 750

Bus rising

In ≤ 1250A 800

500


Direct incoming 600

Bus section 900

Bus rising

1250A < In ≤ 2500A 950

600


Direct incoming 700

Bus section 1050

Bus rising

In = 3150A 1100

2200 1750

700

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3.2 - Delivery The Normacel cubicles are deliveried with the movable circuit breakers immobilized in the "test position". One or several cubicles forming a packing unit will be covered by a thin plastic and are firmly secured on wooden pallets to enable individual transportation and fork lifting.When required by the destination of the cubicles and the type of means of transport other packages are possible. The Fig. 10 and 11 show two types of packages. A package with accessories contains all the material necessary to the site installation: • A set of screws for the busbar, the earthing connector and for screwing the cubicles to each other. • Several busbar components. • A set of copper liners for the busbar junctions. • All the necessary accessories for the cubicles expoitation. • A plastic bag with the following documentation: -This Instructions Manual ; - The Divac circuit breakers Instructions Manual. After the equipment reception : • To check the material list. • To check the presence of accessories bag. • If anomalies are detected, please inform the transporter. Important :The cubicles must be unpacked only at the installation site. Cubicles unpacking • To remove the plastic cap. • To dismount the wooden platform (fixed to the cubicle with 4 screws) - 2 at the front compartment and - 2 at the rear compartment. In the case of the cubicles with drawout voltage transformers, the following operations must be done in order to have access to the 2 screws at the front compartment : - To withdraw the truck to the cubicle outside (see Fig 12); - To unscrew the 2 frontal screws; - To introduce the truck in the test position; - To immobilize the truck in the that position; - To lift the cubicle and to remove the wooden pallet.

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Note : This equipment is completely identified by the manufacturing order number and by the layout drawing number indicated in the signaletic plate (see fig. 13), located in the switchboard right upper part:

Fig 12 – Cubicle with drawout cables VT’s

Type Manufacturing year Manufacturing order Layout drawing Service voltage kV Rated voltage kV Rated frequency Hz Rated busbar current A Rated short time current kA s Auxiliaries rated voltage Protection degree: IP Applicable standard: CEI 298

Fig 13 – Signaletic plate for the switchboard

3.3 - Handling All the cubicles are equipped with a base plate suitable to move the cubicles over rollers. When they are lifting means, it must be used the lifting equipments mounted in the cubicles roof (see fig 14):

As the cubicles with circuit breaker are delivered with this in immobilized in the test position, its handling must be done with it in the test position (like in the expedition).

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Fig 15 – Normacel cubicle handling Fig 14 – Lifting equipment

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3.4 - Storage While the cubicles are not mounted, we recommend its sotrage in a well ventilated place, protected from dust and water. Storage temperature : -5 to 40 ºC, depending on the hygrometric conditions. -5 ºC to hygrometry ≤ 30% R.H.(Relative Humidity) +40 ºC to hygrometry ≤ 70%R.H. If these limits cannot be guaranteed in the storage place. it is necessary to assure that the equipment is well conditionned before delivery . It must be avoided to keep the equipment in places with high and fast temperature variations. It must be checked the completely absence of aggressive vapours like, for exemple, the sulphur anhydride (SO2). Recommendations depending on the storage type :

• Plastic packing : to remove the plastic in order to avoid condensation phenomena.

• Thermally welded tissu packing with dehumidifier sacs: the equipment must be stored within its

original packing which must not be cutted in any case.

3.5 - Installation For a confortable exploitation the cubicles need:

- 1200 mm in the front corridor, for handling the circuit breaker truck.

- 150 to 100 mm at the rear for ventilation purpose.

- 80 to 100 mm between the switchboard ends and the wall.

Cubicles installation The self supported frame, the cables connecting high and the circuit breakers position at the middle

of the cubicle reduce the implantation exigences:

- to a simple floor plate levelness.

- to a floor fastenning, after the installation of all cubicles .

Width (A) mm In B (mm)

700 ≤1250 A 500

850 1250<In≤3150 A 650

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Implantation and MV and LV crossing cables ( dimensions in mm )

Fig 16 – Implantation drawing for Normacel 17,5 Incoming/Outgoing cubicle

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The cubicles floor fastening will depend on the floor levelness. So: - if the floor levelness is regular: - 2 fixing points at the intermediate cubicles - 4 fixing points at the end cubicles - if the floor levelness is irregular: - 4 fixing points in all cubicles. See the following sketch,

Fig 17 – Sketch for fixing points A = 450 mm

A

Fig 18 – Side view Fig 19 – Front view

Fig 20 – Top view

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Checking the screws fastening It is advisable to check periodically the screws fastening of the main circuit and auxilliaries. - Screws for the switchboard fitting and fastening to the floor - Screws for main circuit fastening (electrical contacts) - Screws for fastening the copper bars to the support insulators All the screws are 8.8 class. The recommended fastening couples are indicated in the following table:

General fastening and electrical contacts

Mechanical fastening in

metal insertions of moulded epoxy resin

components (Nm)

Fastening couple Oil or mass

(Nm)

mass MOS2 (Nm)

Without Oil (Nm)

M6 4.5 5.5 10.5 5 M8 10 15 26 12 M10 20 30 50 25 M12 40 60 86 40 M16 80 120 200 100

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3.5.1 - Cables installation

In the Fig 21 are indicated the cables position (exemple of 4 cables/ phase).

Fig 21 – Solution for 4 cables instalation per phase

Width (A) mm In B (mm) C (mm) D (mm)

700 ≤1250 A 500 200 350

850 1250<In≤3150 A 650 250 425

3.5.2 – Fastening the cubicles to each other To remove the circuit breakers trucks from the cubicles inside. To dismount the 4 lifting equipment (spanner 13). The cubicles are fastened to each other through 5 M8 screws and nuts, in the points indicated below: - 3 points at the front compartment; - 2 points at the cables compartment.

Fig 22 – Fastening cubicles to each other Fig 23 – Sketch detail

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3.5.3 – End panels fitting At the end cubicles it is necessary to obturate the busbar compartment with the panel (1) and the front compartment with the panel (2). These panels are fastened from the outside with 8 M8x50 screws. If there is no auxilliary cabinet at the end of the switchboard, it is necessary to obturate the LV cables gutter (see Fig 24)

1

2

Obturador

Fig 24 – Skech for end panels fitting

LV end panel

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3.6 - Connections General information and connection instructions In the busbar, earthing circuit and cables bars connection, it is necessary to respect the assembling sense of all parts and to fasten the screws with the right couple. To use the screws delivered within the accessories pack or screws with the same reference. Contact surface preparation instructions When one connect copper with copper or tinned alluminium with tinned alluminium, there is not necessary any surface preparation. Nevertheless, when one connect alluminium with copper, it is necessary to polish those surfaces with a metallic brush and to lubrificate them with "contactal" or with neutarl vaseline (see references in page 42). 3.6.1 - Busbar connections After removing the internal arc plate for accessing to the busbar (M6 screws, 10 spanner), make the busbar connections between cubicles as indicated in the following pages.. The bars/phase quantity depends on the busbar rated current (see connections table in the following pages). Components references for the busbar connection between cubicles In order to assemble the different components in the correct position, use the Table 1. The round bracket figures (Fig 25a) are related to the busbar connections skeches. Table 1

Busbar/ phase

Junction/ Fase

InBG≤630A 1 bar (63x5)

630<InBG≤1250A

2 bars (63x5)

1250<InBG≤1600A

3 bars (80x5)

1600<InBG≤2500A

2 bars (80x10)

InBG=3150A 3 bars (100x10)

In≤630A 1 connection (63x5)

See table 25a See table 25a See table 25a See table 25a See table 25a

630<In≤1250A 2 connections (63x5)

- See table 25a See table 25a See table 25a See table 25a


- - See table 25a See table 25a See table 25a


- - - See table 25a See table 25a

In=3150A 3 connections (100x10) - - - - See table 25a

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1 bar (63x5) à InBusbar=630A 1 connection (63x5) à InPanel=630A

(2)+(5)+ Screws M10x30H

2 bars (63x5) à InBusbar =1250A 1 connection (63x5) à InPanel =630A

(2)+(3)+(5)+(9)+ Screws M10x40H

2 bars (80x10) à InBusbar =2500A 1 connection (63x5) à InPanel =630A

(2)+(3)+(5)+(9)+ Screws M10x55H

2 bars (63x5) à InBusbar =1250A 2 connections (63x5) à InPanel =1250A

(2)+(3)+(5)+(6)+ Screws M10x40H


(2)+(3)+(5)+(6)+ Screws M10x55H


(2)+(3)+(5)+(6)+ Screws M10x55H


(2)+(3)+(5)+(6)+(7)+ Screws M10x55H


(2)+(3)+(4)+(5)+(9)+(10)+(12)+ Screws M10x45H


(2)+(3)+(4)+(5)+(9)+(10)+(12)+ Screws M10x90H


(2)+(3)+(4)+(5)+(6)+(10)+(12)+ Screws M10x45H


(2)+(3)+(4)+(5)+(6)+(10)+(12)+ Screws M10x90H


(2)+(3)+(4)+(5)+(6)+(10)+(12)+ Screws M10x90H


(2)+(3)+(4)+(5)+(6)+(7)+(12)+ Screws M10x45H


(2)+(3)+(4)+(5)+(6)+(7)+(12)+ Screws M10x90H


(2)+(3)+(4)+(5)+(6)+(7)+(12)+ Screws M10x90H

Fig 25a – Skecth for the main busbar connections between cubicles

25

Components references for the busbar ends connection In order to assemble the different components in the correct position, use the Table 2 The round bracket figures (Fig 25b) are related to the busbar connections skeches. In the switchboard end cubicles case or in the busbar section case (bus coupling and bus rising cubicles), one can fit in the phase one or two reinforcements in orde to maitain the shunt busbar in the insulating support. Table 2

Busbar /Phase

Junction /Phase

InBG≤630A 1 bar (63x5)

630<InBG≤1250A 2 bars (63x5)

1250<InBG≤1600A

3 bars (80x5)

1600<InBG≤2500A

2 bars (80x10)

InBG=3150A 3 bars

(100x10)

In≤630A 1 connection (63x5)

See table 25b See table 25b See table 25b See table 25b See table 25b


- See table 25b See table 25b See table 25b See table 25b


- - See table 25b See table 25b See table 25b


- - - See table 25b See table 25b

In=3150A 3 connections (100x10) - - - - See table 25b

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1 bar (63x5) à InBusbar=630A 1 connection (63x5) à InPanel=630A

(2)+(5)+(11)+ Screws M10x30H

2 bars (63x5) à InBusbar=1250A 1 connections (63x5) à InPanel=630A

(2)+(3)+(5)+(9)+(11)+ Screws M10x40H

2 bars (80x10) à InBusbar=2500A 1 connection (63x5) à InPanel=630A

(2)+(3)+(5)+(9)+(11)+ Screws M10x55H


(2)+(3)+(5)+(6)+(11)+ Screws M10x40H


(2)+(3)+(5)+(6)+(11)+ Screws M10x55H


(2)+(3)+(5)+(6)+(11)+ Screws M10x55H


(2)+(3)+(5)+(6)+(7)+(11)+(12)+ Screws M10x55H


(2)+(3)+(4)+(5)+(9)+(10)+(11)+(12)+ Screws M10x45H


(2)+(3)+(4)+(5)+(9)+(10)+(11)+(12)+ Screws M10x90H


(2)+(3)+(4)+(5)+(6)+(10)+(11)+(12)+ Screws M10x45H


(2)+(3)+(4)+(5)+(6)+(10)+(11)+(12)+ Screws M10x90H


(2)+(3)+(4)+(5)+(6)+(10)+(11)+(12)+ Screws M10x90H


(2)+(3)+(4)+(5)+(6)+(7)+(8)+(11)+(12) Screws M10x45H


(2)+(3)+(4)+(5)+(6)+(7)+(8)+(11)+(12) Screws M10x90H


(2)+(3)+(4)+(5)+(6)+(7)+(8)+(11)+(12) Screws M10x90H

Fig 25b – Sketch for the main busbar ends connection

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Busbar position

InBusbar = 630 A 1 bar 63 x 5

InBusbar = 1250 A 2 bars 63 x 5 or InBusbar = 2500 A 2 bars 80 x 10

InBusbar = 1600 A 3 bars 80 x 5 or InBusbarl = 3150 A 3 bars 100 x 10

Fig 25c – Main busbar compartment with busbar position

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3.6.2 - Connection of the earthing circuit between cubicles

The cubicles main earthing conductor is placed at the bottom of the rear socket. After coupling the cubicles, connect the two portions of the earthing conductor.

Fig 26 – Connection of the earthing circuit between cubicles

3.6.3 – Connection of the earthing conductor at the end of the switchboard

At the end of the switchboard the main earthing conductor is connected to the earth pit. The connection cable must be connected to the cubicles earthing circuit as shown below.

Legend: 1 - Screw M 8x30 8.8 2 - Washer cfa 8 3 - Washer cfa 8 4 - Main earth collector 5 - Plait for the switchboard connection to the substation

6 - Flat washer M 8 7 - Screw M 8x30 8.8 8 - NutH M8 8.8 9 - Nut MM 8 8.8

Fig 27 – End of the switchboard

Fig 28 – Connection of the earthing conductor

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3.6.4 - MV cables connection

Connection options allowed by the equipment

- Cubicle In ≤ 1250A (700 mm wide) 1 or 2 cables per phase with 500 mm2 maximum section

- Cubicle 1250A < In ≤ 3150A (1000 mm wide) 2 or 4 cables per phase with 500 mm2 maximum section

General and connection instructions

We guarantee the basic characteristics, within the limits below stated: - The maximum usable cable section is of 500 mm2; - The maximum with permitted for connection is of 60 mm (700mm wide); - When connecting the MV cables the correct positioning of the terminals, the

fastening plates and the screws as well as the proper fastening torques, must be respected;

- The connection locations are delivered undrilled. Thus being, it is necessary to drill them on the spot according to the type of terminals used. The drilling information below indicated is according to terminals in compliance with current manufacturing standards. The use of 500 mm2 Aluminium terminals (6 holes) or above is not possible.

Anyhow, the use of other kind of terminals is possible as long as their dimensions are kept within the limits defined above in the basic characteristics guarantee.

In order to permit a simple and effective drilling to obtain a correct spacing between holes, the following solution can be adopted :

- immobilise the terminal at the connection location with the help, of quick-acting clamps, respecting the positioning measures;

- centre-plot the drilling positions using the terminal as a template; - remove the terminal; - remove the connection location; - drill the holes and remove chipped edges, if necessary; - assemble the connection

Connection locations drilling information according to the type of terminal used

Fig 29a – Connections for ail terminals not exceeding 240 and 300 and 400 mm2 AI-Cu terminals

Fig 29b – Connections for 500 and 630 mm2 AI-Cu terminals and 300 and 400 mm2 Al terminals

30

Contact surfaces preparation instructions If the connections are in copper and the terminals are in copper or tinned aluminium, no preparation of the contact surfaces is needed-However when connecting bare aluminium terminals, it is recommended to polish the surfaces with a wire brush or emery paper followed by "contactal" or neutral vaseline greasing.

Fig 29c – Cable termination Legend: 1 - Washer CFA 8 2 - Cable connection bar 3 - Cable 4 - Cable 5 - Cable passage 6 - Cable clamping 7 - Middle cables screen plates

8 - Side cables screen plates 9 - Support plate of the cables screen plates 10 - Screw M 8x20 11 - Screw M8x50 12 - Rivet nut M8 13 - NutHM8

Fig 30 - Sketch showing cable connection

31

The cables passage must be cut as shown in figure 32

Fig 31 – PVC cable passage Fig 32 – Cut-out process

Assembly sequence

- After having cut the cable passages (5) (in case of one cable/phase cut only one) fit them to the cables;

- Connect the terminals (3) and (4) to the connection locations (2), respecting the correct position indicated on the sketch;

- Insert the bottom cables screen plate (8); - Locate the cables passage (5) over the cables screen plates (7) and (8); - Place the clamping assemblies (6) and (11) on each side of the cables, under the

cable passages. The assembly is fixed over the bottom plates as shown in sketch, with 2 screws M8x50, 1 nut A, M8H and 1 washer CFA 8;

- Connect the cables screen plaits to the cables screen plates.

In case of 4 cables/phase assembly, insert 3 double punching bottom plates (7) between the two side plates.

4 - SETTING TO WORK

4.1- General

The Normacel cubicles are mechanically and electrically inspected before despatch.

If the equipment should be stored in a damp spot, it is recommended to warm up the premises or to feed the cubicles heating elements, if supplied, during 24 hours before setting to work. In any case it is necessary to carry out a certain number of checking procedures before any operation:

- Checking of the withdrawable circuit-breaker, in particular the contact fingers; - The ease of the plugging/unplugging operations; - Operation of the mechanical interlocks; - Before connecting the cables, measure the insulation resistance of the switchboard

with a megaohmimeter (Disconnect any existing external circuits). - Proper execution of the cable connections; - Absence of any strange object inside the cubicles.

Do not try under any circumstance to operate a lever or link inside the control mechanism, if either the dosing spring is armed, either the circuit-breaker is closed (opening spring armed) or if the LV feeding circuits are not interrupted (AC or DC). For greater safety, remove the fuses from the recharging motor of the control mechanism.

If necessary perform a triple manual operation, opening - closing - opening, to disarm the opening and closing springs of the control mechanism.

For any intervention on the circuit-breaker or its control mechanism, look it up in the respective manual.

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4.2 - Voltage feeding

For the first voltage feeding of the switchboard proceed as following description: - Make sure all the circuit-breakers are open and in the sectioning position, the earthing

switches are open and the cable access panels are fastened.

First incoming cubicle:

- Feed the cables. Check if the neon lamps from the voltage indicator case lighten; - Feed the busbar by plugging, locking and closing the circuit-breaker (see "Operation"

chapter).

Second incoming cubicle:

- Feed the cables. Check if the neon lamps from the voltage indicator case lighten; - Check if the incoming supplies are in phase.

To check the good performance of the phase agreement case, connect the case between the two phases of the first incoming: The lamp should lighten.

- Insert the phase agreement case in the upper socket (L1) of the voltage indicator case of one of the cubicles;

- Insert the male plug of the phase agreement case's wire in the upper socket (L1) of the voltage indicator case of the other cubicle. If there is a phase agreement the neon lamp of the phase agreement case does not lighten;

- Repeat the same operations for phases L2 and L3.

First Incoming cubicle Second Incoming cubicle

Fig 33 – Phase agreement control in Incoming cubicles

33

5 - OPERATION

5.1 - Control panel of the cubicle.

Fig 34 – Frontal control panel of Normacel Incoming/Outgoing cubicle

Legend:

1 - Door locker of the circuit-breaker compartment 2 - inserting hole for the maneuver lever of the earthing switch 3 - Mimic diagram of the earthing switch condition (Open/Closed) 4 - Anti-return handle 5 - Earthing switch key lock in the closed position 6 - Earthing switch key lock in the opened position 7 - Voltage indicators 8 - Interdiction lock for the circuit-breaker insertion in the cubicle 9 - Coupling Latches of the transport carriage to the cubicle

5.2- Operation of the circuit-breaker compartment

The Circuit-breaker has 2 working positions:

- Plugged in (Service Position) - Withdrawn (Test Position)

5.2.1 Operation of the circuit-breaker at the cubicle

5.2.1.1 Placing the movable part in the service position

The circuit-breaker movable part can be leaded to the service position both with the circuit-breaker compartment door closed and opened, see photographs 35 and 36. To insert the circuit-breaker (with the door open), use the lever referred in the “Accessories” section, inserting the tool in the square head of the worm screw and while pressing, rotate the tool clockwise. See Fig 35.

Note: Placing the circuit-breaker in the service position with the door closed is identical to the open door situation, having now to insert the lever through the door hole. See Fig 36.

34

Fig 35 - Circuit-breaker movable part with the compartment door opened

Fig 36 - Circuit-breaker movable part with

the compartment door closed

The signal that the circuit-breaker arrived its inserted position is signalized by the "click" that sounds in the clutch when the lever turns in false. INTERLOCKINGS The circuit-breaker can not be leaded to the service position if:

a) The earthing switch is closed. Otherwise, when the circuit-breaker starts its movement, there is a interlock that acts on the clutch, preventing the circuit-breaker insertion;

b) The LV plug is not pulled in. The associated interlock provokes the clutch actuation, preventing thus the circuit-breaker insertion,

c) It's closed. When trying to insert it closed, an interlock provokes its tripping, just after the start of the movement;

Operating sequence to place the circuit-breaker in the service, position

1º- Assure that the earthing switch is open; 2º- Assure that the LV plug is pulled in. See Fig 38

To pull in the LV plug, push the interlocking piece and pull in the plug. After pulled in rotate the plug fixation lever and let the interlocking piece return to the initial position;

3º- Assure that the circuit-breaker is opened; 4°- Insert the circuit-breaker.

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5.2.1.2 Placing the movable part in the test position

To place the circuit-breaker in the test position makes use of the same lever used to place it in the service position. The rotation direction is for the left (the reverse of the insertion). As in placing in service, the signal that the circuit-breaker arrived its test position is signalized by the "click" that sounds in the clutch when the lever turns in false. To remove de circuit-breaker, there must be previously the care of opening it. Otherwise the circuit-breaker will trip before the start of the withdrawal movement.

5.2.2 - Operating the circuit-breaker out of the cubicle

5.2.2.1 - Placing the circuit-breaker inside the cubicle To place the circuit-breaker inside the cubicle, use the transport carriage referred in the

«Accessories» section. Operating sequence for the circuit-breaker insertion in the cubicle

- After placing the circuit-breaker upwards the transport carriage, move it up to the circuit-breaker compartment,

- Open the circuit-breaker compartment door - See Fig 37; - Connect the transport carriage to the cubicle. Tighten the latches (located at the side

handles) and make them fit in the cubicle spangles. In case the latches do not easily fit or the circuit-breaker is over or under the circuit-breaker compartment level, the transport carriage levelers must be rotated - See Fig 42 e 64;

- Uncouple the circuit-breaker transport carriage. Move the circuit-breaker inside the cubicle and couple the circuit-breaker latches in the cubicle - See Fig 40 and 41;

- Uncouple the transport carriage of the cubicle tightening the appropriated latches.

Fig 37 – Circuit-breaker compartment

door

Fig 38 – LV circuit-breaker connection

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Fig 39 – Circuit-breaker transport carriage connect to the cubicle

Fig 40 – Extract the circuit-breaker up to the

transport carriage

Fig 41 – Extract the circuit-breaker from the cubicle

Fig 42 – Extract the circuit-breaker from the

cubicle

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5.2.2.2 - Withdrawing the circuit-breaker out of the cubicle

The operating sequence is like placing the circuit-breaker inside

Withdrawing operating sequence

- Open the circuit-breaker compartment door - Couple the transport carriage with the cubicle (Fig. 39) - Pull circuit-breaker upwards transport carriage and connect the clicks (fig. 40 e 41) - Remove the transport carriage (fig. 42)

5.2.3 - Removal impediment / Circuit-breaker insertion in the cubicle An optional interlock against circuit-breaker insertion exist.

Fig 43 – Interlock against Circuit-breaker insertion

5.2.4 - Circuit-breaker manual rearming (Emergency control)

Without voltage in the electrical motor of the control mechanism, or during mechanical tests, the circuit-breaker rearming can be done manually with an emergency crank handle, making suave vertical movements, in any position of the circuit-breaker.

The crank handle must be removed before the electrical closing of the circuit-breaker.

To connect the circuit-breaker set the green button - See Fig 46

To disconnect the circuit-breaker set the red button - See Fig 47

38

Fig 44 – Closing spring recharge system Fig 45 – Closing spring recharge system

Fig 46 – To connect the circuit-breaker set the green button

Fig 47 – To disconnect the circuit-breaker set the red button

39

5.3 - Voltage Transformers exploration Normacel cubicles are able to use fixed or withdrawable voltage transformers. 5.3.1 Withdrawable Transformers Withdrawable transformers can be moved with voltage in the cubicle. The down picture represents the VT´s truck

Fig 48 – Withdrawable truck-mounted voltage transformers 5.3.1.1 Placing VT´s in the operating position For the insertion of VT´s the door must be closed

Fig 49 – Voltage Transformers in the operating position

40

Fig 50 – Withdrawn Voltage Transformer position

For the VT´s insertion use the correct crank handle indicated in the acessories. The insertion is like the circuit-breaker. After begin the insertion , the door is interlocked so can't be opened . In picture 51 we can see the insertion of VT´s to the operating position in a cable compartment and in the 52 in a busbar compartment (of a busbar coupler cubicle).

Fig 51 – Insertion of Cables VT’s

Fig 52 – Insertion of Busbar VT’s 5.3.1.2 Placing VT's in the test position To place the VT's in the test position must use the same crank handle , but now with a inverse rotation To open the door compartment , the VT's must be in the test position 5.3.1.3 Fuses changing Sequence operation for the changing - Place the VT's in the withdrawn position - Remove the voltage compartment door (Fig 53) - Remove the insulating PVC protections (Fig 54) - Fuses changing (Fig 55) - Replace the Insulating PVC protections in the same position and tigthen the screws.

41

Fig 53 – Cables compartment door opening

Fig 54 – Fuses changing

Fig 55 – Fuse changing

42

5.3.2 Fixed Voltage Transformers In this version we can have fuses or not and to open the transformer door compartment the earthing switch must be closed. Fuses changing: - Put the cubicle out of service disconnecting the circuit-breaker. - Place the circuit-breaker in the test position. - Close the earthing switch. - Open the door compartment. - Remove the insulating PVC protection . - Change the fuses. - Replace the PVC protections in the rigth position and tighten the screws. - Close the door. - Open the earthing switch. - Setting the cubicle to work again

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5.4 - Earthing switch manoeuvre

The earthing switch mouvement is independent of the operator action. Interloking The earthing switch can't be closed if : - circuit breaker isn't in the test position; - Key interlock isn't in the open position, (in the cubicles with this option).

Fig 56 – ES in open position – Introduce handle to close the ES

Fig 57 – ES open position interlock

Fig 58 – ES in close position – The

handle position to open the ES Fig 59 – ES close position interlock

44

Sequence operations

Earthing switch closing:

- Check if the circuit breaker is in the test position;

- Check if the earthing switch isn't interlocked in the opened position (Fig 57);

- Introduce the operating handle in the opening, with the extremity turned up (Fig 56);

- Push down and maintain during the beginning of the earthing switch closing, the anti-return handle, placed by the side of the opening (Fig 56);

- Turn around the operating handle with the clock pointers orientation;

- Must be a complete mouvement with approximately 180º (Fig 58);

- Take out the operating handle.

Earthing switch opening:

- Check if the earthing switch isn't interlocked in the closed position;

- Introduce the operating handle in the opening , with the extremity turned down (Fig 58);

- Push down and maintain during the beginning of the earthing switch openning , the anti-return handle, placed by the side of the opening (Fig 56);

- Turn around the operating handle with the clock pointers contrary orientation;

- Must be a complete mouvement with approximately 180º (Fig 58);

- Take out the operating handle.

6 - MAINTENANCE

For all instructions referring to maintenance of circuit-breaker or control mechanism , report to correspondent instructions manuals.

6.1 - Cleaning of the circuit-breaker chambers

- It is advisable to clean the outside of the circuit-breaker chambers when the switchgear truck is withdrawn;

- Clean the dust with a dry cloth or slightly soaked in a degreasing agent ( trichloretane, for example) in case of being much greasy;

- The cleaning frequency must be deternined according to the atmospheric pollution of the environment which may considerably from one place to another;

- In case the circuit-breaker chambers are much dirty then it is advisable to verify the other circuit-breakers and their cleaning if dirty;

6.2 - Changing the transformation ratio of the Current Tranformers

The changing of the CT’s ratio can be done in two different ways , depending on type transformers:

- Primary serial/parallel connection . Must access the cable compartment.

- By secondary tapping. Changing must be done in the low voltage compartment .

45

6.3 - Voltage Transformers fuse replacement

See § 5.3.1.3 -Fuses changing

6.4 - Cleaning and lubrication

- Electrical contacts:

The sectioning contacts are prepared in the factoty . In normal operating conditions they do not need to be lubricated again. In case of severe operating conditions ( corrosive atmosphere , dust , frequent plugging and unplugging , etc.) we advise that the condition of the parts should be checked once a year , cleaned and lubricated if necessary.

For that purpose:

• Degrease completely using a solvent of the tetrachloretane type (under no circunstance should a detergente be used);

• Lubrify with a thin layer of neutral vaseline.

To avoid over-lubrication:

• Lubrify the plug-in contacts but not the contact fingers;

• Clean the excess of vaseline with a dry cloth.

- Articulated mechanical parts lubrication.

Reference of the suitable products

Product Type Reference

“Contactal” grease (electrical parts)

“Contactal”

Neutral industrial vaseline

Neutral industrial vaseline

Molybdenum Disulphide grease

(Mechanical parts)

“Lubrymoly”

M1Type

Solvent

-

46

6.5- Checking the conditions of the earthing switches contacts

The earthing switches contacts do not suffer any erosion in normal operation.However, if a closing operation is made onto a short-circuit with a high fault current peak, or some operations with a medium value current , it is necessary to check the state of the contacts and remove any pearling with a soft emery paper.

7. Acessories

7.1 - Earthing switch operating handle - See Fig 60.

Fig 60

7.2 - Crank handle for withdrawable circuit-breaker and Voltage transformers trucks - See Fig 61.

Fig 61

7.3 - Keys for interlocking the earthing switch, withdrawable part (optional)-See Fig 62.

Fig 62

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7.4 - Circuit-breaker truck transport carriage

One circuit-breaker transport carriage by Normabloc.

To introduce or remove the circuit-breaker, should couple the transport carriage to the cubicle, introducing the interlock clicks. Only after that, be able to introduce or remove the circuit-breaker.

Interlocking

If the couple isn’t correct, a interlock impede the circuit-breaker mouvement on the transport carriage - See Fig 63.

Fig 63

7.5 - Circuit-breaker manually rearming handle - See Fig 64.

Fig 64

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EFACEC AMT – Aparelhagem de Média Tensão, S.A.

Porto

Arroteia • Leça do Bailio • Apartado 1018 4466 - 952 S.Mamede de Infesta Codex • Portugal

Telef: (+351) 229 562 300 • Fax: (+351) 229 562 870

Exportação

Arroteia • Leça do Bailio • Apartado 1018 4466 - 952 S.Mamede de Infesta Codex • Portugal

Telef: (+351) 229 562 300 • Fax: (+351) 229 562 870

Lisboa

Rua da Garagem, 1 • Apartado 527 • Carnaxide 2796 Linda-a-Velha Codex • Portugal

Telef: (+351) 214 163 600 • Fax: (+351) 214 163 620

air-insulated withdrawable switchboard - neopet-bg.com instruction... · fig 3a - busbar coupling...

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