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.

Structure of complete device

1. Composed elements

 

Dry type single-phase grounding transformer, resistor, disconnector, surge arrestor and so on. CT is also equipped in the enclosure which measures neutral current and outputs analog quantity

 

2. Cubicle outline

Ordering instruction

1. Please provide the following information when place the order

2.  grounding transformer transformation ratio and resistance

3. Grounding transformer insulation form (dry or oil-immersed)

4. Current transformer transformation ratio

5. Wiring-in from the top or bottom

6. Time of fault current flowing-through

7. Material, IP and color of enclosure and installation site

8.The Mix order quantity :one set .