31-40 Definitions

Question 1

Separate Excitation Device

Answer 1

One which connects a circuit such as a synchronous converter shunt field to a source of separate excitation

Question 2

D-C Reverse Power Relay or Device

Answer 2

Functions on a given value of D-C reverse power

Question 3

Position Switch

Answer 3

One which makes or breaks contact when the main device or piece of apparatus, reaches a given position

Question 4

Motor-Operated Sequence Switch

Answer 4

One which fixes the operating sequence of the major devices during starting and stopping, or during other sequential-switching operations

Question 5

Brush-Operating or Slip-Ring Short-Circuiting Device

Answer 5

One for raising, lowering or shifting the brushes of a machine, or for short-circuiting the slip ring

Question 6

Polarity Device

Answer 6

One which operates or permits the operation of another device on a given polarity only

Question 7

Undercurrent or Underpower Relay

Answer 7

Functions on a given minimum of current or power flow

Question 8

Bearing Thermal Device

Answer 8

Functions on excessive bearing temperatures

Question 9

Field Reducing Contactor

Answer 9

Inserts resistance in the field circuit of a machine or otherwise reduces its field excitation

Question 10

Field Relay

Answer 10

Functions on a given value of machine field current