2. Operation Environment
2.1 Apply to indoors
2.2 Ambient temperature: between -40 and +40 centigrade
2.3 Altitude shall not exceed 3000m
2.4 Relative humidity lower than 95% (25 centigrade)
2.5 Power grid frequency: 58-62Hz (60Hz system), 48-52Hz (50Hz system)
2.6 The installation site shall be free from chemical corrosion, vapor or explosive dust
3. Parameters of grounding transformer
3.1 Insulation class:H
3.2 Temperature rise:≤100K
3.3 Cooling:AN
3.4 Protection Level: for paper-insulated dry type grounding transformer, the PI is divided into IP00 (no enclosure), IP20and IP23 (with enclosure) .
3.5 Insulation level, impedance voltage on-load loss and no-load loss are according to relevant national standards.
3.6 Insulation resistance testing: high voltage-low voltage and to earth≥300MΩ,and low voltage-earth≥100MΩ.
