AUTN SERIES

POLYLUX’S AUTN SERIES

Three phase neutral generating autotransformers

In the AUTN series, we find three-phase autotransformers to generate artificial neutral in three-phase lines and designed to operate continuously and at maximum output.

They have a rating range as from 1kVA up to 400kVA and are designed to be used, mainly from the zig-zag connection, supporting voltage imbalances in the network and to supply a more stable neutral.

We can find different versions depending on their degree of protection:

  • AUTNX: IP00
  • AUTNW: IP23
  • AUTNZ: IP54/65

Constructive features:

  • All the autotransformers are dipped in anti-flash varnish and then compacted in the oven. This process increases the insulation grade, reduces noise and provides anti-moisture, waterproof protection.
  • All the connection terminals are made of copper. For transformers with aluminium coils, internal bimetallic AL-CU connections are made by welding with filling and sealing material to ensure a safe, long-lasting connection.
  • The high-power autotransformers are made with format cores and low loss properties, thus contributing to increase their performance.

AUTNX
Three-phase autotransformers for dry type neutral generator with anti-flash varnish finished for maximum protection, insulation, noise and vibration reduction.
Rating
From 1 kVA to 400 kVA
Input voltage
400 V
Output voltage
NEUTRAL
Protection degree
IP-00

Frequency
50/60 Hz
Connection group
ZN0
Cooling
AN
Ambient temperature
45 ºC
Temperature rise
From Class F – 155ºC to Class H – 180ºC
Insulation
Class H – 180ºC
Windings
Class HC – 200 ºC
Test voltage
3 kV (1 min, 50 Hz)
Standards
From IEC/EN/UNE-EN 61558, CE to IEC/EN/UNE-EN 60076, CE
AUTNW
Three-phase autotransformers for dry type neutral generators, finished in anti-flash varnished in IP23 metal enclosure with protection to prevent direct contact with electrical parts.
Rating
From 1 kVA to 400 kVA
Input voltage
400 V
Output voltage
NEUTRAL
Protection degree
IP-23 / IK-08

Frequency
50/60 Hz
Connection group
ZN0
Cover
Metal enclosure RAL 7035 (cat. C3 ISO 12994-2)
Cooling
ANAN
Ambient temperature
45 ºC
Temperature rise
From Class F – 155ºC to Class H – 180ºC
Insulation
Class H – 180ºC
Windings
Class HC – 200 ºC
Test voltage
3 kV (1 min, 50 Hz)
Standards
From IEC/EN/UNE-EN 61558, CE to IEC/EN/UNE-EN 60076, CE
AUTNZ
Three-phase autotransformers for dry type neutral generator, with anti-flash varnish finished in IP54/65 metal enclosure with protection for outdoor installation.
Rating
From 1 kVA to 400 kVA
Input voltage
400 V
Output voltage
NEUTRAL
Protection degree
From IP-65 / IK-10 to IP-54 / IK-10

Frequency
50/60 Hz
Connection group
ZN0
Cover
Metal enclosure RAL 7035 (cat. C4 ISO 12994-2)
Cooling
From ANAN to ANAF
Ambient temperature
45 ºC
Temperature rise
From Class F – 155ºC to Class H – 180ºC
Insulation
Class H – 180ºC
Windings
Class HC – 200 ºC
Test voltage
3 kV (1 min, 50 Hz)
Standards
From IEC/EN/UNE-EN 61558, CE to IEC/EN/UNE-EN 60076, CE
Includes
Silent blocks

Special Manufacturing

We build transformers and inductive elements tailored to your needs.

Tell us about your needs and our engineers will create a solution adapted to your company.