Page 586 - Industrial Power Engineering and Applications Handbook

Captive (emergency) power generation 161551
Devic e number Function Device number Function

159 Overvoltage relay Underfrequency relay
60 Voltage or current balance relay D.C. reclosing relay
61 Reserved for future application Automatic selective control or transfer relay
62 Time-delay stopping or operating relay Operating mechani5m

63 Bucholz relay Carrier pilot-wire receiver relay
64 Restricted ground fault relay Lock-out relay
65 Governor Differential protective relay
66 Notching or jogging device Auxiliary motor or motor generator
A.C. directional overcurrent relay Disconnecting switch

67h Directional ground fault relay Regulating device
6X Blocking relay Voltage directional relay
69 Permissive control device Voltage and power direction relay
70 Rheostat Field-changing contactor

71 Level switch Anti-pumping relay
72 D.C. circuit breaker Supervision relay
71 Load-resistor contactor Used for specific applications where other
\ymbols are not suitable
73 Alarm relay
Fuse failure relay
75 Position changing mechanism
Motor protection relay
76 D.C. overcurrent relay
Auxiliary relay tor Y
77 Pulse transinitter
Further reading
78 Phase-angle measuring or out of step relay
79 Auto reclosing relay Birnbhra, P.S., Generalised Theo? qfElectric~trl Machine% Khanna
Publications, India.
x0 Flow switch Siemens Elecrrictrl Engineering Handbook, Siemens AG. Munich.
and Heyden and Sons Ltd, London, UK (for general information).
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Bawl on ANSMEEE C 37 2