GB/T 15663.11-2008Terms relating to coal mining - Part 11: Coal mining electrical engineering (English PDF)

2.1

Voltage power lines from various substations and power users will mine linking transmission, transformation, distribution and consumption of the whole.

2.2

Voltage power lines from various substations and power users will mine linking transmission, transformation, distribution and consumption of the whole.

2.3 Underground power supply system

Into the mine underground power cable, power supply units and consisting of transmission, transformation, distribution and consumption of the whole.

2.4 Downhole Face Power Supply System

Into the mine underground tunnel near the face and power cable, power supply units and consisting of transmission, transformation, distribution and consumption of the whole.

2.5 Mining area substation (refused to use)

To several mines, open pit mine and other units of electricity supply substations.

2.6 Mine surface main substation

Located on the ground, the whole mine power transformation and distribution centers.

2.7 Large ground current system

Neutral grounding or via a low impedance grounding system. Typically zero-sequence reactance to the positive-sequence reactance ratio less than or equal to 3;

Zero-sequence resistance to positive sequence reactance ratio is less than or equal to 1.

2.8 Small ground current system

Ungrounded, or high impedance value by grounding or resonance grounding system. Typically the ratio of its system of zero-sequence reactance and positive sequence reactance

Greater than 3; the ratio of zero-sequence resistance to positive sequence reactance is greater than 1.