COMEM EN-IT-DE-ES-FR User manual

Porcelain Bushings Low Voltage
EN-IT-DE-ES-FR
INSTRUCTION MANUAL

2
CONTENT INDEX
Content index
Safety ...........................................................4
Product description ......................................4
Installation....................................................4
Operation and maintenance .........................6
Technical features........................................7
Appendix A - Drawings .............................. 29
Indice dei contenuti
Sicurezza......................................................9
Descrizione del prodotto ..............................9
Installazione .................................................9
Funzionamento e manutenzione ............... 11
Caratteristiche tecniche ............................ 12
Appendice A - Disegni ............................... 29
Inhalt
Sicherheit ...................................................14
Produktbeschreibung ................................ 14
Installation................................................. 14
Betrieb und Instandhaltung ....................... 16
Technische Merkmale ............................... 17
Anlage A - Zeichnungen ............................ 29
Índice de contenidos
Seguridad ...................................................19
Descripción del producto........................... 19
Instalación................................................. 19
Funcionamiento y mantenimiento ............. 21
Características técnicas............................ 22
Apéndice A - Planos .................................. 29

3
Index du contenu
Sécurité ......................................................24
Description du produit ............................... 24
Installation................................................. 24
Utilisation et entretien ............................... 26
Caractéristiques techniques...................... 27
Annexe A – Dessins................................... 29

4
Safety Product description
Installation
Safety instructions
Make sure that any person installing, taking into operation
and operating the porcelain bushing:
• Is technically qualied and competent
• Fully complies with these assembling instructions.
Improper operations or misuse could cause danger to:
• life and limb;
• to the equipment and other assets of the operator;
• to the equipment proper function.
Safety instructions in this manual are shown in three diffe-
rent forms to emphasize important information.
Safety notes on the equipment operation
Electrical installation is subject to the relevant national
safety rules.
This information indicates particular danger to life and health.
Disregarding such a warning can lead to serious or fatal injury.
All relevant fire protection regulations must be strictly followed.
This information indicates particular danger to equipment or
other property of the user. Serious or fatal injury cannot be
excluded.
The operating and installation requirements described in this
manual must be strictly followed. If not, the device can be
damaged or a malfunction may occur.
Installation, electrical connection and fitting the device may only
be performed by qualified personnel and only in accordance with
this instruction manual.
It is the responsibility of the user to ensure that the device is
used for specified application only.
For safety reasons, please avoid any unauthorized and improper
usage.
This notes give important or specific information concerning the
equipment or as to work with the equipment.
WARNING
WARNING
CAUTION
CAUTION
CAUTION
NOTE
These instructions are applicable to porcelain bushings
with rated voltages from 1 kV to 3 kV and rated currents
from 250 A to 6500 A.
These bushings are designed to operate with the upper
part in air and the lower part immersed in the transformer
oil. Porcelain bushings have been designed and produced
in conformity with the following standards : EN 50386 ,
DIN 42530 , DIN 42539 and COMEM design.
Assembly on the transformer tank for porcelain bushings
in accordance with standard EN 50386
Figure 1
PORCELAIN BUSHINGS LOW VOLTAGE
The porcelain insulator bushing (gure 1) must be installed
using the following steps:
• Check the thickness of tank which should correspond
with the value reported in each porcelain bushing
drawings; if the thickness is more than the reported
values, the oil will not ll the insulator properly.
• Make a hole on the tank of the transformer using the
diameters in table 18. If the porcelain bushing is
provided already assembled, Unscrew the nut
(component n. 8 in gure 1) and then slip off the
porcelain (1) with the assembled gasket (5) and the
metal part and gaskets in air: 10,6,9,4 (gure 1).
• The bolt (3) with soldered lower washer (7) must be
installed as pictures in picture 1 (the lower insulation (2)
ensemble with the bolt), through the hole on the tank
• If the insulator bushing correspond to solution “B “the
bolt plate Y has to be place in the plate housing X (gure 3)
• Assembly the components: (5), (1), (10), (6), (9) ,(4), (8)
and once the insulator bushing is full of oil, the air inside
must be removed unscrewing the nut (8) and nally the
rated torque shall be applied to the upper nut (see table
18).

5
Assembly on the transformer tank for porcelain bushings
in accordance with standard DIN 42530, DIN 42539,
COMEM design
Figure 2
Figure 4
Figure 5
Figure 3
The porcelain insulator bushing (gure 4) must be installed
using the following steps:
• Check the thickness of tank which should correspond
with the value reported in each porcelain bushing
drawings ; if the thickness is more than the reported
values , the oil will not ll the insulator properly.
• Make a hole on the tank of the transformer using the
diameters in table 18.
• The bolt with lower washer (3) must be installed as
pictures in gure 5 (the lower insulation (2) with gaskets
(11) and (10) ensemble with the bolt), through the hole
of the tank.
• Assembly the components: (5), (1), (13), (9), (6), (4), (8)
and once the insulator bushing is full of oil, the air inside
must be removed unscrewing the nut (8) and nally the
rated torque shall be applied to the upper nut (see table
18).
Tank
Y
Y
Figure 6
Cable connection
Electrical connections may only be carried out by qualified,
skilled personnel trained in the applicable health and safety
regulations of the relevant country.
Care must be taken over electrical connection to avoid ionization
phenomena.
Choose the section of the connections to be used and connect
them applying the torque recommended in Table 1 as a function
of the rated current of the porcelain bushing.
CAUTION
Rated current (A) Recommended torque (Nm)
250 12
630 20
1250 30
2000 55
3150 60
4500 75
6300 110
5000-8000 115
Table 1

6
When the wires are connected to an upper terminal connector
(figure 7) tighten the bolts with a torque as in table 2. Make
sure that the connection is well performed in order to avoid
overheating.
CAUTION
Figure 7
Thread of bolt Recommended torque (Nm)
M10 25
M12 40
M16 90
Table 2
Operation and
maintenance
The glaze
The glaze on the insulators is primarily intended to give
a good surface appearance which is smooth and rejects
dirt and is therefore also easy to keep clean. The glazing
is not needed to stop moisture entering the insulator since
the porcelain itself after ring is nonporous and does not
absorb moisture. Due to manufacturing techniques, glaze
Table 3
Troubleshooting
Fault Physical phenomenon Solutions
Oil loss from the ange of the bushing Leakage Tighten the stud bolts to the recommended torque .
Check correct positioning of the gasket.
Check the surface of the tank to ensure no uneven parts or excessive
roughness.
Oil leaking from the top of the bushing Leakage Better tighten the nut on the hood bushing (gure 12)
There are hissing noises at the ange Corona effect Check the voltage applied
The correct assembly of the bushing.
Check oil inside the bushing insulator.
There are hissing noises at the connection in air Corona effect Check whether the conductor connected to the bushing has any edges
that cause increased electric eld density.
Electric discharge at the air end outside the bushing Electric discharge Check the connection at the air end of the bushing.
Abnormal distribution of temperatures in the
bushing.
Thermal effect Check the connections applying the torque recommended in Table 15-16.
Check that the section of the conductors for connection to the bushing
is correct.
PORCELAIN BUSHINGS LOW VOLTAGE
defects cannot always be avoided and standards allow
minor defects within certain limits. Glaze Defects , not
exceeding the limits according to IEC 62155, are permitted
on porcelain insulators used on bushings.
Packaging
All porcelain bushings are shipped inside a cardboard box
positioned on a pallet to facilitate transport and storage.
Acceptance
Upon receiving the bushing, the Customer must carry out
the following operations:
• examine the outer surface of the packaging to check
that it is intact;
• open the packing crate removing the lid;
• check that the fastening elements are intact and well
secured;check that there are no breakages.
If damages are found, please contact COMEM, providing
the delivery note number or PO number or COMEM order
acknowledgement number.
Rating data
The rating data of the bushing is indicated on the mark pla-
ced on the porcelain in agreement with relevant standard.
Storage
The porcelain bushing must be stored in the original
packaging indoors. Permissible storage temperatures are
in the range of -40 °C to 60°C.To preserve the bushing, it
is strictly recommended to keep the porcelain bushing
closed inside the the cartoon/wood box.
Cleaning
Cleaning of the sheds during periodic maintenance of
the transformer is recommended.If the bushing has a
high level of pollution due to the environment in which
it is installed, we recommend cleaning by rubbing the
entire surface with a soft sponge soaked in a solution of
soap and water at 50°C. The bushing must then be rinsed
thoroughly with tap water.

7
Bushing disposal
In case of bushing disposal, refer to the country current
regulation.
Porcelain Bushing main materials are:
• Brass
• Copper
• Ceramic
• Rubber
Table 4
If the problem is not mentioned in the cases above, please
contact COMEM (S.R. 11 Signolo, 22 36054 Montebello
Vicentino (VI) – Italy,
Tel [phone]
E-mail: [email protected]
Technical features
Name – catalogue
reference
Standard Rated
current
A
Nominal
voltage
kV
Dry lightning
impulse voltage
kV
Creepage
distance (min)
mm
Arcing distance
(min)
mm
Fastening torque
bolt
Nm
1/250 – A1 DIN 42530 250 1 -60 50 12
3/250 – A1 DIN 42539 250 340 120 100 12
1/630 – A1 DIN 42530 630 1 -75 60 20
3/630 – A1 DIN 42539 630 340 120 100 20
1/1000 – A2 DIN 42530 1000 1 -75 60 30
3/1000 – A2 DIN 42539 1000 340 125 100 30
1/2000 – A2 DIN 42530 2000 1 -75 60 70
3/2000 – A2 DIN 42539 2000 340 125 100 70
1/3150 – A2 DIN 42530 3150 1 -75 60 100
3/3150 – A2 DIN 42530 3150 340 125 100 100
1/250 – A3 EN 50386 250 1 20 55 -12
1/250 – A4 EN 50386 250 1 20 55 -12
1/630 – A5 EN 50386 630 1 20 70 -20
1/630 – A6 EN 50386 630 1 20 70 -20
1/1250 – A7 EN 50386 1250 1 20 75 -30
1/1000 – A8 EN 50386 1250 1 20 75 -30
1/1250 – A8 EN 50386 1250 1 20 75 -30
1/2000 – A9 EN 50386 2000 1 20 75 -70
1/3150 – A9 EN 50386 3150 1 20 75 -100
1/4000 – A9 EN 50386 4000 1 20 85 -125
1/5000 – A9 EN 50386 5000 1 20 85 -135
3/4500 – A10 COMEM 4500 340 140 107 125
3/6500 – A11 COMEM 6500 340 140 107 135

8
PORCELAIN BUSHINGS LOW VOLTAGE
Cantilever operating load (bushing installed ≤ 30° from vertical) (N)
Um (kV) Rated current (A)
≤ 800 1000
1600
2000
2500
≥3150
3500 N 625 N 1000 N 1575
Cantilever test load (N)
Um (kV) Rated current (A)
≤ 800 1000
1600
2000
2500
≥3150
1 (EN 50386) 400 N (250A) 500 N (630 A) 600 N 1000 N 1600 N
31000 N 1250 N 2000 N 3150 N
Mechanical characteristic
Operating conditions
Porcelain bushings can be used up to an altitude of 1000
m. For installation at higher altitudes please contact our
customer servicel: [email protected].
Ambient temperature of air:
• according to IEC 60137
Transformer oil temperature
• for normal load: max 100°C
• daily average: 90°C
Temporary over-voltages are allowed in accordance to the
standard IEC 60076-7.
Table 5
Table 6

9
Sicurezza Descrizione del prodotto
Installazione
Istruzioni di sicurezza
Assicurarsi che il personale incaricato di installare e
operare sull’isolatore:
• sia tecnicamente qualicato e competente
• rispetti pedissequamente queste istruzioni d’assemblaggio
L’uso improprio di questi dispositivi potrebbe determinare
pericolo per:
• vita e arti
• attrezzatura e altri beni dell’operatore
• corretto funzionamento dell’attrezzatura
Le istruzioni di sicurezza di questo manuale sono riportate in
tre diversi formati per sottolineare informazioni importanti.
Note di sicurezza sul funzionamento dell’attrezzatura
L'’installazione elettrica è soggetta alle leggi nazionali di
sicurezza.
Questa informazione indica un particolare pericolo per la vita e
la salute. Ignorare questo tipo di avvertimento potrebbe causare
ferite gravi o fatali.
Il regolamento antincendio deve essere rigorosamente rispettato.
Questa informazione indica un particolare pericolo per
l'attrezzatura o altri beni dell'operatore. Ferite gravi o fatali non
sono da escludersi.
I requisiti di installazione e funzionamento presenti in questo
manuale devono essere rigorosamente seguiti. In caso contrario,
il dispositivo potrebbe essere danneggiato o potrebbe verificarsi
un malfunzionamento.
L'installazione, la connessione elettrica e il montaggio del
dispositivo devo essere effettuati da personale qualificato e
solo secondo questo manuale di istruzione. E' responsabilità
dell'utente assicurarsi che il dispositivo sia utilizzato per la sua
corretta applicazione. Per questioni di sicurezza, evitare usi non
autorizzati o impropri.
Questa nota offre informazioni importanti o specifiche
sull’attrezzatura o su come operarvi.
AVVERTIMENTO
AVVERTIMENTO
ATTENZIONE
ATTENZIONE
ATTENZIONE
NOTA
Queste istruzioni sono applicabili a Isolatori in porcellana
con tensione nominale da 1 kv a 3 kV e correnti nominali
da 250 A a 6500 A.
Questi isolatori sono progettati per operare con la parte
superiore in aria e la parte inferiore immersa nell’olio del
trasformatore. Gli isolatori in porcellana sono progettati e
prodotti secondo le normative: EN 50386, DIN 42530 , DIN
42539 e per design COMEM.
Montaggio sul trasformatore in accordo alla normativa
EN 50386.
Figura 1
L’isolatore in porcellana (gura 1) deve essere installato
secondo la seguente procedura:
• Vericare che lo spessore della parete del trasformatore
corrisponda al valore riportato nel disegno di ciascun
isolatore; se lo spessore è superiore a quello riportato,
l’olio non riempirà correttamente l’isolatore.
• Eseguire un foro sul serbatoio del trasformatore
utilizzando il diametro indicato nella tabella 18. Se
l’isolatore è fornito già assemblato, svitare il dado
(componente n. 8 nella gura 1) e slare la porcellana
(1) con la guarnizione di assemblaggio (5) e le parti
metalliche e guarnizioni in aria: 10,6,9,4 (gura 1).
• Il tirante (3) con le relative rondelle inferiori (7) devono
essere installati come indicato nella gura 1 (l’isolazione
inferiore (2) insieme al tirante), attraverso il foro sulla
cassa del trasformatore. Se l’isolatore corrisponde
alla soluzione “B”, il piatto del tirante Y deve essere
posizionato nella relativa sede X (gura 3).
• Assemblare i componenti: (5), (1), (10), (6), (9), (4), (8)
e non appena l’isolatore è pieno d’olio, l’aria al sui interno
deve essere rimossa svitando il dado (8) ed inne la
relativa coppia di serraggio deve essere applicata sul
dado superiore (vedi tabella 18).

10
Assemblaggio degli isolatori in porcellana sulla cassa del
transformatore in accordo con gli standard DIN 42530,
DIN 42539, COMEM design
Figura 2
Figura 4
Figura 5
Figura 3
L’isolatore in porcellana (gura 4) deve essere installato
secondo i seguenti passaggi:
• Vericare che lo spessore della cassa corrisponda al
valore riportato nel disegno del relativo isolatore; se lo
spessore è maggiore di quello riportato, l’olio non
riempirà correttamente l’isolatore.
• Eseguire un foro sulla cassa del trasformatore
utilizzando il diametro indicato in tabella 18.
• Il tirante con rondelle inferiore (3) deve essere
installato come indicato in gura 5 (l’isolamento
inferiore (2) assemblato insieme alle guarnizioni (11) e
(10)), attraverso il foro sulla cassa.
• Assemblare i componenti: (5), (1), (13), (9), (6), (4), (8) e
quando l’isolatore è pieno d’olio, l’aria al suo interno deve
essere rimossa svitando il dado (8); inne applicare la
coppia indicata per il dado superiore (vedi tabella 18).
Tank
Y
Y
Figura 6
Connessione dei cavi
Le connessioni elettriche possono essere realizzate solamente
da personale qualificator e preparato, formato sulle norme di
salute e sicurezza vigenti nel paese di riferimento. È necessario
curare le connessioni elettiche allo scopo di evitare fenomeni
di ionizzazione. Scegliere la sezione delle connessioni da
utilizzare e connetterle applicando le coppie raccomandate nella
tabella 1 in funzione della corrente nominale dell’isolatore.
ATTENZIONE
Rated current (A) Recommended torque (Nm)
250 12
630 20
1250 30
2000 55
3150 60
4500 75
6300 110
5000-8000 115
Tabella 1
PORCELAIN BUSHINGS LOW VOLTAGE