Dry - type transformer wiring

1, pole mounted distribution transformer "input" and "output" terminal with a megger test with the ground insulation resistance. 1000V megger measurement, the resistance is greater than 2M ohms.
2, the transformer input and output power line cross-section wiring should meet the requirements of the current value of the size; in accordance with the 2-2.5A / min2 current density configuration is appropriate.
3, the input and output of three-phase power line should be the transformer wiring board bus color yellow, green, red, respectively, then A phase, B phase, C phase, neutral line should be neutral with the transformer neutral line, grounding line, single phase step down transformer Shell and the transformer center point connected to the usual we said that the ground and the neutral line are derived from the transformer neutral point. (Such as a transformer box should be connected with the corresponding ground box logo).
Check the input and output lines to make sure they are correct.
4, the first no-load power, observe the test input and output voltage to meet the requirements. While observing the machine
Internal abnormal sound, ignition, odor and other abnormal phenomena, if abnormal, please immediately disconnect the input power.
5, when the load test is completed and normal, before access