1. Electric Contacts

Introduction

• Electric contacts mean the electric contact elements to exements to execute mechanical switching or contact of electric circuits for such electric equipment and breakers and switches.Electric contacts are used in all industries including switches, relays, electromagnetic switches, wiring breakers, car instrumentation, electric locomotive engines, high-voltage transmission/distribution facilites and elevators. For such use of electric contacts, correct contacts considering electric, mechanical and chemical actions should be selected.

Conditions

1. Electric and mechanical erosion resistance
2. Fusing resistance
3. Safety of contact resistance and high-temperature rise
4. Transfer resistance
5. Anti-insulation degradation

2. Mechanism

Introduction

• Definition of Mechanism: A mechanism is very important equipment to have the function for safe input and breaking action of contacts(fixed and movable) attached to all electric instruments.

Conditions

• Types and Application of Mechanism:
  1. Mechanical equipment of dead point type by springs
  Application .....Pad mounted swiches, Gas Load Break Switch(GLBS)
  2. Mechanism of toggle holding type by spring contracion
  Application.... Automatic Sectionalizing Switch (ASS)
  Load Break Switch(LBS)
  Auto Load Transformer Switch(ALTS),
  GLBS of control box driving type

3. Discharge Electrode

Introduction

• In general, brass or graphite including copper, Cu-W and Ag-W is used depending on use as electrode materials for discharging, but CU-W and Ag-W show excellent performance when clean surface and shape degree is needed in the final shape.

Conditions

• Performance of electrode materials is an follows:
  1. keeps safe discharging and executes rapid processing;
  2. reduces electrode consumption;
  3. shows fine electrode forming processing; and
  4. is a non-polluting material