Ungrounded voltage transformers NOL (НОЛ)

Description

The transformers are intended for embedding in open factory-assembled switchgears and are used for powering electrical measuring devices, protection and signaling circuits in electrical appliances of alternating current with 50 or 60 Hz frequency. Transformers are manufactured in climatic versions "УХЛ" (moderate) and T (tropical) according to the standard requirements of GOST 15150 and are intended for usage under following operating conditions:

altitude above sea level is not higher than 1000 m;
ambient air temperature is from minus 60°С to plus 50°С for "УХЛ1" version and from minus 10°С to plus 55°С for "T1" version;
environment should be non-explosive, without corrosive gas and steam in proportions that are likely to destroy metal and insulation;
mounting in vertical position;
the creepage path - III according to GOST 9920.

Patent certificates:
1. № 2087967, 2110862 and 2193252 on invention.
2. № 42733 on industrial unit.

Table 1. Technical data

Parameter	Transformer type
Parameter	NOL-3	NOL-6	NOL-10
Voltage class, kV	3	6	10
Maximum operating voltage, kV	3,6	7,2	12
Rated voltage of primary winding, V	3000 3300	6000 6300 6600 6900	10000 11000
Rated voltage of secondary winding, V	100 or 110*
Rated frequency, Hz	50 or 60
Rated power, VA, in accuracy class: 0,2* 0,5 1,0 3,0	15 30 50 150	30 50 75 200	50 75 150 300
Maximum power out of accuracy class, VA	250	400	630
Vector group of transformer	1/1-0

Notes:
Transformers for Automated Systems of Commercial Calculations of Electrical Energy are supplied by special order with single accuracy class and rated power specified in the order.

*) Rated voltage of secondary winding 110V only for transformers with rated voltage of secondary winding 6600 V and 11000 V.
**) Highest accuracy class should be specified in the order.
***) Highest accuracy class 0,2 is only available for transformers with 100 V rated voltage of secondary winding.

General view of transformer (drawing)

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