HIGH VOLTAGE VALVE GROUP WITH INCREASED BREAKDOWN STRENGTH
A high voltage assembly including a valve group and a shield connected to the valve group. A resistor is connected between the shield and the valve group The assembly provides an increased breakdown strength and DC withstand level.
1 . A high voltage assembly, comprising:
a valve group,
a shield connected to said valve group, and
a connection resistance connected between said shield and said valve group, whereby increased breakdown strength and DC withstand level are obtained.
2 . The high voltage assembly according to claim 1 , wherein said connection resistance comprises a resistor.
3 . The high voltage assembly according to claim 2 , wherein said resistor has a resistance value within the range of 2 MΩ-40 MΩ.
4 . The high voltage assembly according to claim 1 , wherein said valve group comprises thyristor valves arranged in a twelve pulse valve group.
5 . The high voltage assembly according to claim 1 , wherein said connection resistance has a controlled capacitance.
6 . The high voltage assembly according to claim 5 , wherein said controlled capacitance is much larger than the capacitance between the shield and an adjacent wall.
7 . The high voltage assembly according to claim 6 , wherein said controlled capacitance is about one thousand times larger than capacitance between the shield and an adjacent wall.
8 . The high voltage assembly according to claim 1 , wherein said connection resistance comprises a water resistor.
9 . The high voltage assembly according to claim 1 , wherein said shield is comprises a metallic shield.
10 . The high voltage assembly according to claim 1 , further comprising
a plurality of shields,
a plurality of valve groups, and
a connection resistance connected between each shield and a respective valve group.
11 . The high voltage assembly according to claim 1 , wherein said high voltage assembly is a high voltage power converter.