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.