Product description

Destination:

The three-pole supports for external, medium-voltage fuses are used in the distribution networks of electricity suppliers at the transformer stations, ensuring protection against overcurrents and atmospheric overvoltages of power transformers.

Constructive and functional characteristics:

The rigid metal support allows the installation of fuses and arresters. It is protected by electrochemical or thermal galvanization, in accordance with the standards in force, provided with a terminal to ensure the connection to the earth socket.
It is composed of 3 impenetrable support insulating assemblies made of composite materials, provided at the top with connection terminals and 3 arresters with zinc oxide in the composite case.
Fixing the three-pole fuse holder is done by attaching the frame to two clamping collars on the pole. The necklaces are executed according to the type of pole on which they are mounted. It is ordered and delivered separately from the fuse support, depending on the beneficiary's request.

Technical characteristics:

Nominal voltage 24 kV
Nominal frequency 50 Hz
The nominal voltage of young at lightning impulse:
• between each of the contacts provided with composite insulators against the ground and against adjacent poles 125 kV
• between each of the contacts provided with composite insulators and the contacts provided with ZnO arresters related to each phase 145 kV
Nominal pulling tension at industrial frequency for 1 minute (effective value)
• intre fiecare din contactele prevazute cu izolatoare compozite  fata de masa si fata de polii adiacenti 50 kV
• intre fiecare din contactele prevazute cu izolatoare compozite si contactele prevazute cu descarcatoare ZnO aferenta fiecarei faze 60 kV
Curentul nominal al patroanelor fuzibile 2,5÷31,5 A
Masa neta 37 kg
Dimensiuni de gabarit 400x1200x570 mm

Caracteristici tehnice ale descarcatoarelor
Curentul de descarcare nominal                    10 kA
Clasa descarcatorului                        1
Curent maxim de impuls 4/10µs                    100 kA

Caracteristici tehnice ale izolatoarelor
Curent nominal al sigurantelor fuzibile                    2,5÷ 31,5 A
Tensiunea de tinere la impuls de tensiune de trasnet (uscat)        125 kV
Tensiunea de tinere la frecventa industriala in mediu umed            min. 55 kV
Tensiunea de tinere la impuls de comutatie in mediu umed (250/2500µs)    105 kV
Tensiune de conturnare la 50% impuls de trasnet (1,2/50 µs) uscat        160 kV pozitiv.

Symbology:

S    suport tripolar
F    siguranta fuzibila
E    de exterior
D    descarcator
24 kV    tensiune nominala

Usage conditions:

Ambient temperature -30°C...+40°C
Umiditate relativa a aerului        max 95% la +20 °C
Maximum altitude 2000 m
Lifetime            20 ani