变压器器问题

power transformer enlisted MT and BT copper coil, cooling in oil, conforming to IEC recommendations, consistent with the standards NFC 52-100, 52-112, 52-113,
adjusting the voltage switch-off,
frequency 50Hz
MT and BT crossed china conforming to NFC 52-052, 52-053,
Short circuit voltage 4%
Pole Type H.61
Power 160 KVA
HV 20000 volts
BT B2 (voltage between phase 100V Vacuum)
coupling: Neutral left side low voltage

-breaker pole top transformer type H.61
consistent with spéecification HN 63-S-10
with mechanical, (November-December pole m)
with block trigger
Type 160kva/B2

-transformer support bracket-type H61
galvanized steel with horizontal cross
有谁知道什么是MT and BT j铜线圈吗？
NFC 标准跟IEC有区别吗？
Pole Type H.61 是什么意思啊？

在这里感谢先了。。