Air Circuit Breakers : Operating characteristics of trip relay / OCR-III

Ratings

Classification			Types and ratings of trip relays
TYPE	60Hz		N*6	C*6	P*6	M*6
	50Hz		N*5	C*5	P*5	M*5
Application			For industry	For industry	For generator protection	For generator protection
Possible number of ACB poles			3,4P	3,4P	3,4P	3,4P
Operating voltage	1		AC/DC 110V-220V	AC/DC 110V-220V	AC/DC 110V-220V	AC/DC 110V-220V
	2		DC24V	DC24V	DC24V	DC24V
	4		DC48V	DC48V	DC48V	DC48V
Communication			—	●	—	●
	Communication protocol		—	RS 485	—	RS 485
	Protocol		—	DNP 3.0	—	DNP 3.0
	Transmission speed		—	9600 bps	—	9600 bps
Operating characteristics	Long-time delay (L)		●	●	●	●
	Short-time delay (S)		●	●	●	●
	Instantaneous time delay (I)		●	●	●	●
	Ground fault (G)		●	●	●	●
	Pre-alarm (P)		●	●	●	●
Rated current (A)		In =…×In Max.	For industry : 0.2-0.3-0.4-0.5-0.6-0.7-0.8-0.9-1.0 For generator protection : 0.2-0.3-0.4-0.5-0.6-0.7-0.8-0.9-1.0
Continuous current (A)		Ic =…×In	0.6-0.65-0.7-0.75-0.8-0.85-0.9-0.95-1.0
Long-time delay (L) (Error tolerance : ±10%)	Trip current (A)	IL=…×Ic	1.5
	Trip time (sec)	LTD	For industry : 15-20-25-30～465-470-475-480(Steps:5sec) For generator protection : 1.5-2.0-2.5-3.0～46.5-47.0-47.5-48.0(Steps:0.5sec)
Short-time delay (S) (Error tolerance : ±15%)	Trip current (A)	Is =…×In	1.5-2-3-4-5-6-7-8-9-10-no(Steps : 0.5)
	Trip time (sec)	STD	0.05-0.06～0.49-0.5(Steps : 0.01sec)
Instantaneous time delay (I) (Error tolerance : ±15%)	Trip current (A)	Ii =…×In	4000A under : 2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-no(Steps : 1) 5000A over : 2-3-4-5-6-7-8-9-10-11-12-no(Steps : 1)
	Trip time (sec)	INST	0.025 under (Note)
Ground fault (G) (Error tolerance : ±20%) Pre-alarm (P) (Error tolerance : ±10%)	Trip current (A)	Ig =…×In max Inp =…×In max	3 pole : 0.2-0.3-0.4-0.5-0.6-0.7-0.8-0.9-1.0-no(Steps : 0.1) 4 pole : 0.5-0.6-0.7-0.8-0.9-1.0-no(Steps : 0.1)
	Trip time (sec) Trip current (A)	GTD	0.1-0.2-0.3～2.8-2.9-3.0 (Step : 0.1sec)
		Ip =…×Ic	0.7-0.8-0.9-1.0
	Trip time (sec)	PAL =…×LTD	0.5(setting Ip 1.0), Operating time : Half of the long time invers time

Note

*

In case of short circuit accident, instantaneous operation time of OCR is under 15ms.

Power consumption of trip relay

Operational voltage	OCR - III
AC/DC 110-220V	5VA
DC 24V	5VA
DC 48V	5VA

Trip relay type selection

Function
N	Communication function NO (For industry)
C	Communication function YES (For industry)
P	Communication function NO (For generator protection)
M	Communication function YES (For generator protection)

Operational voltage
1	AC/DC 110-220V
2	DC 24V
4	DC 48V

Frequency
6	60Hz
5	50Hz

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