Tyco electronics Bda User manual

ENERGY PRODUCTS

2005-06-Arrester installation instr-CIS-Rev 1

Installation Instruction

Polymeric Medium Voltage

ZnO Surge Arresters

Type:

BDA, CPA, HDA, NDA, OCP, SPA

ISO 9001 & 14001

EC 60099-4; Ammedment 2 2001

Medium Voltage ZnO Surge Arresters

2005-06-Arrester installation instr-CIS-Rev 1

Safety Warning

Surge arresters should be installed only

by competent personnel familiar with

good safety practices and the handling of

high voltage electrical equipment.

The enclosed installation instruction is not

intended as a substitute for adequate training and

experience in safe procedures nor to replace or

supersede existing safety, operating and

maintenance procedures.

Installation Note

Arresters are typically to be installed between the line

conductor and ground.

Only in a few special cases (motor protection, cable

sheath protection, ...) arresters may be installed in a

different way. Please consult your system administrator

for details if required.

Before Starting



Check if all parts (surge arrester & accessories)

are included in the box according to the

description printed on the carton label.



If the accessories come disassembled please

assemble all parts as appropriate prior to the

final installation. Please refer to the enclosed

drawings for the correct torque.



Check if the arrester or the accessories have

been damaged during transport. Never install a

damaged arrester. It may fail violently, causing

severe personal injury.



All surge arresters carry a nameplate giving

details of arrester type and voltage rating. Check

the voltage rating of each single arrester. Do not

install arresters with voltage ratings other than

specified by your system administrator.



Check if the arrester and the accessories fulfill

the local requirements in terms of mechanical

dimensions. Do not alter the arrangement of the

accessories or the accessory itself!

Do not leave out any parts!



Please ask your local system administrator about

the minimum clearances you have to meet

between live parts and ground. The values for

outdoor substations do apply. If not available you

may refer to Table 1 instead showing the values

according to IEC 60071-2.



If you are installing a special kind of surge

arresters like SPA-I with insulated line lead,

shorter clearances may apply. Please refer to the

relevant addendum covering those arresters.



If unsure about assembly sequence, please

request and refer to relevant assembly drawing.

Arresters applied at voltages higher than

rating may cause damage and injury.

Check the arrester rating, marked clearly

on the name plate, to ensure correct

application!

Installation

Do not handle the polymeric housing of the

arrester with tools!

Certain type of arresters ave a protrusion at both

ends of the arrester.

You can hold the arrester there safetly with a

second wrench to fasten the nuts included with

some accessories. Use the protrusion on the side

close to the nut to be fastened.

In case the arrester hasn’t got a protrusion please

support the arrester by hand.



Make sure that the electrical system is de-

energized and earthed.

Medium Voltage ZnO Surge Arresters

2005-06-Arrester installation instr-CIS-Rev 1



Strictly follow the local safety instructions and

maintenance procedures.



Select a mounting position as close as

practicable to the equipment (transformer, cable

termination, ...) to be protect in order to obtain

the highest degree of protection.



Connect the ground lead to the arrester ground

terminal stud or accessory. Fasten the nut to the

torque indicated in the relevant drawing.



In case the arrester comes with a metallic

bracket attached it is possible to connect the

ground lead to the bracket. The line lead may

also be left out if the bracket or the arrester

terminal is directly mounted on the earthed tank

or frame of the apparatus provided that the

electrical contact is reliable and earthing

interconnections are suitable. In doubt please

use separate conductor cables or strip to

connect the bracket or the arrester terminal to

system earth.



Connect the line lead to the arrester line terminal

stud or accessory. Fasten the nut to the torque

indicated in the relevant drawing.



Make the arrester ground and line connections

as short as possible avoiding sharp bends and

loops. If the line connection cannot be made

short, consider connecting the line directly to the

arrester and continue from there.



The continuous mechanical stress applied to the

arrester i.e. via the connection shall not exceed

the specified values. Mechanical overload may

shorten the arrester’s service lifetime

significantly.



In case the arrester is equipped with a

disconnector device (a „D“ is shown in the middle of

the description, e.g. ARR-ACC-BDM. ) make sure that

the ground lead is flexible enough to allow the

disconnector to operate properly.



Re-energize the electrical system. Avoid single-

phase switching because this may lead to ferro-

resonance of the transformer! If single-phase

switching needs to be done, make sure that you

are operating with protection as arresters may be

destroyed in case of ferro-resonances.

Maintenance

Bowthorpe arresters are maintenance free. There

are no serviceable parts inside.

Performance checks are not required during the

expected service life.

Removing Arresters

The polymeric housing of failed surge

arrester sometimes is inflated. This can happen if

the fault current is switched off fast before the

housing ruptures!

This typically does not represent a hazard if the arrester

is allowed to cool down to ambient temperature. Be

careful anyway when removing such kind of arresters.



Make sure that the electrical system is de-

energized.



Strictly follow the local safety instructions and

maintenance procedures.



Disconnect the line lead from the circuit.

Disconnect the ground lead from the circuit.

Clearances

ab a

System Voltage Um

[kV]

ph/ph*(a)

[mm] ph/ground*(b)

[mm]

7,2 152 121

12 182 151

17,5 222 191

24 282 251

36 382 351

local regulations and standards may require

wider clearances!

Table 1: Minimum clearances following IEC60071-2

for altitudes up to 1000 m (3300 ft).

Medium Voltage ZnO Surge Arresters

2005-06-Arrester installation instr-CIS-Rev 1

max.

50 Nm !

Fig 1: Max. torque at the terminals of the arreste

Other considerations: Altitude

The clearances quoted above are

recommended min clearances required

for applications up to 3,300 ft (1,000m

metres). For installations at higher

altitudes, the accepted practice is to add

3% to the clearance length for every

1,000 ft (300 metres) increase in altitude

above 3,300 ft (1,000 metres). The 3%

is also added to the external housing

flashover distance of the arrester itself.

The information contained in this installation instruction is intended to describe the correct method of installation for this product. However, Tyco

Electronics has no control over the field conditions which influence product installation. It is user’s responsibility to determine the suitability of the

installation method in the user’s field conditions. Tyco Electronics only obligations are those in Tyco Electronics standard Conditions of Sale for this

product and in no case will Tyco Electronics be liable for any other incidental, indirect or consequential damages arising from the use or misuse of the

product.

Tyco Electronics Raychem GmbH

Energy Division

Finsinger Feld 1

85521 Ottobrunn/Munich

Germany

Tel: +49 89 6089 485

Fax: +49 89 6089-484