Obrazec Protokola Ispitanij Silovie Transformatori

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Isolation and protection isolation transformers Technical description 18.1 Isolation transformers are used for decoupling of electrical circuits in order to reduce the risk of simultaneous touching of grounded part and the part under voltage. Isolation transformers are used to fulfil 'protective decoupling measures', which means they have a double or reinforced insulation between primary and secondary winding.

Connected equipment is isolated from network voltage source and must not be grounded. Isolation transformers are produced in compliance with EN61558-1/ IEC61558-1, EN61558-2-4/IEC61558-2-4. The following values are applied: Input voltage: up to 1.000 V Frequency: up to 400 HZ Output voltage: up to 1.000 V (in idle time or under load) Power: Single-phase transformers: up to 25 kVA Three-phase transformers: up to 40 kVA Isolating transformers must have a special marking so that they could be distinguished from transformers for other purposes. 18.2 Protection isolation transformers are used for supplying of distribution circuits, machines and other equipment up to voltage 50 V AC or 120 V DC (voltage from rectifier) in idle time or under burden in order to prevent dangerous touch voltages in case of equipment fault.

Protective isolation transformers fulfil protective measures 'protection by extra low voltage', which means that they have a voltage of up to 50 V AC on the secondary and double or reinforced insulation between the primary and secondary winding. Also, they are used where the usual protective measures may not be applied, such as e.g. TN protection system against touch voltage.

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They are produced pursuant to EN61558-1/ IEC61558-1, EN61558-2-6/IEC61558-2-6, EN61558-2-13/IEC61558-2-13. The following values are applied: Input voltage: up to 1.000 V Frequency: up to 400 HZ Output voltage: up to 50 V (in idle time or under load) Power: Single-phase transformers: up to 10 kVA Three-phase transformers: up to 16 kVA Protective isolating transformers must have a special marking so that they could be distinguished from transformers for other purposes.

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