(23) IDMT Relay Grading (1.8.23).xlsx

	C	D	E	H	I	J	L	M	N	O	R	S	T	W	X	Y
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2	Tail end >>>> To Source End (Radial System)	:IDMT Over Current Relay Grading Calculation (50/51):					Jignesh.parmar, www.electricalnotes.wordpress.com, jiguparmar@yahoo.com
3	Enter Data in White Background Cells
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5	Trail end Last Bus Bar	D		Bus Bar Location	C			Bus Bar Location	B		Bus Bar Location	A		Bus Bar Location	E
6	Load Current (IL)	160	Amp	Load Current	200	Amp		Load Current	200	Amp	Load Current	200	Amp	Load Current	200	Amp
7	Min Fault Current	2000	Amp	Min Fault Current	3500	Amp		Min Fault Current	3500	Amp	Min Fault Current	3500	Amp	Min Fault Current	3500	Amp
8	Max Fault Current	3000	Amp	Max Fault Current	4000	Amp		Max Fault Current	4000	Amp	Max Fault Current	4000	Amp	Max Fault Current	4000	Amp
9	CT Ratio (Amp) for Relay-D	100	1	CT Ratio (Amp) for Relay-C	300	1		CT Ratio (Amp) for Relay-B	300	1	CT Ratio (Amp) for Relay-A	300	1	CT Ratio (Amp) for Relay-E	300	1
10	Curve Selection for Relay-D	Normal Inverse (NI)		Curve Selection for Relay-C	Normal Inverse (NI)			Curve Selection for Relay-B	Normal Inverse (NI)		Curve Selection for Relay-A	Normal Inverse (NI)		Curve Selection for Relay-E	Normal Inverse (NI)
11	Plug Setting of Relay-D	200%		Plug Setting of Relay-C	100%			Plug Setting of Relay-B	100%		Plug Setting of Relay-A	100%		Plug Setting of Relay-E	100%
12	TMS of Relay-D	0.100	Sec	TMS of Relay-C	0.28	Sec		TMS of Relay-B	0.42	Sec	TMS of Relay-A	0.54	Sec	TMS of Relay-E	0.67	Sec
13	Relay Error (%)	7.5%		Relay Error (%)	7.5%			Relay Error (%)	7.5%		Relay Error (%)	7.5%		Relay Error (%)	7.5%
14	CT Error (%)	10.0%		CT Error (%)	10.0%			CT Error (%)	10.0%		CT Error (%)	10.0%		CT Error (%)	10.0%
15	Over shoot	0.05	Sec	Over shoot	0.05	Sec		Over shoot	0.05	Sec	Over shoot	0.05	Sec	Over shoot	0.05	Sec
16	C.B Interrupting Time	0.17	Sec	C.B Interrupting Time	0.10	Sec		C.B Interrupting Time	0.10	Sec	C.B Interrupting Time	0.10	Sec	C.B Interrupting Time	0.10	Sec
17	Safety	0.33	Sec	Safety	0.10	Sec		Safety	0.10	Sec	Safety	0.10	Sec	Safety	0.10	Sec
18	Total Time Grading:	0.58	Sec	Total Time Grading:	0.28			Total Time Grading:	0.32		Total Time Grading:	0.35		Total Time Grading:	0.38
19	Expected Operaion Time of Relay-D	0.25	Sec	Expected Operaion Time of Relay-C	0.83	Sec		Expected Operaion Time of Relay-B	1.10	Sec	Expected Operaion Time of Relay-A	1.42	Sec	Expected Operaion Time of Relay-E	1.78	Sec
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21	O/L Relay Setting for Section: D			O/L Relay Setting for Section: C-D				O/L Relay Setting for Section: B-C			O/L Relay Setting for Section: A-B			O/L Relay Setting for Section: E-A
22				Primary Protection for C-D				Primary Protection for B-C			Primary Protection for A-B			Primary Protection for E-A
23	Operating Time of Relay D at Max Fault at D			Operating Time of Relay C at Max Fault at D				Operating Time of Relay B at Max Fault at C			Operating Time of Relay A at Max Fault at B			Operating Time of Relay E at Max Fault at A
24	Over Load Current :	125%	X IL	Over Load Current :	125%	X IL		Over Load Current :	125%	X IL	Over Load Current :	125%	X IL	Over Load Current :	125%	X IL
25	Over Load Current :(In)	200	Amp	Over Load Current :(In)	250	Amp		Over Load Current :(In)	250	Amp	Over Load Current :(In)	250	Amp	Over Load Current :(In)	250	Amp
26	Required Over Current Relay Plug Setting	2	2 A X In	Required Over Current Relay Plug Setting	0.83	0.8 A X In		Required Over Current Relay Plug Setting	0.83	0.8 A X In	Required Over Current Relay Plug Setting	0.83	0.8 A X In	Required Over Current Relay Plug Setting	0.83	0.8 A X In
27	Actual Plug Setting of Over Current Relay (PMS): (I>)	2	2 A X In	Actual Plug Setting of Over Current Relay (PMS): (I>)	1	1 A X In		Actual Plug Setting of Over Current Relay (PMS): (I>)	1	1 A X In	Actual Plug Setting of Over Current Relay (PMS): (I>)	1	1 A X In	Actual Plug Setting of Over Current Relay (PMS): (I>)	1	1 A X In
28	Plug Setting Multiplier (PSM):	15		Plug Setting Multiplier (PSM):	10			Plug Setting Multiplier (PSM):	13		Plug Setting Multiplier (PSM):	13		Plug Setting Multiplier (PSM):	13
29	Time Multiplier Setting: (TMS)	0.100		Time Multiplier Setting: (TMS)	0.28			Time Multiplier Setting: (TMS)	0.418		Time Multiplier Setting: (TMS)	0.540		Time Multiplier Setting: (TMS)	0.674
30	Time of Operation of Relay	2.52	Sec	Time of Operation of Relay	2.97	Sec		Time of Operation of Relay	2.63	Sec	Time of Operation of Relay	2.63	Sec	Time of Operation of Relay	2.63	Sec
31	Actual Operaion Time of Relay D: (t>)	0.25	Sec	Actual Operaion Time of Relay C: (t>)	0.83	Sec		Actual Operaion Time of Relay B: (t>)	1.10	Sec	Actual Operaion Time of Relay A: (t>)	1.42	Sec	Actual Operaion Time of Relay E: (t>)	1.78	Sec
32	Time Grading:	0.58	Sec	Time Grading:	0.28	Sec		Time Grading:	0.32	Sec	Time Grading:	0.35	Sec	Time Grading:	0.38	Sec
33	Required Operaiting Time of Relay D at Max Fault at Bus-D	0.83	Sec	Required Operaiting Time of Relay D at Max Fault at Bus-C	1.10	Sec		Required Operaiting Time of Relay C at Max Fault at Bus-B	1.42	Sec	Required Operaiting Time of Relay B at Max Fault at Bus-A	1.78	Sec	Required Operaiting Time of Relay A at Max Fault at Bus-E	2.16	Sec
34				Backup Protection for D-				Backup Protection for C-D			Backup Protection for B-C			Backup Protection for A-B
35	Operating Time of Relay D at Min Fault at D			Operation Time of Relay C at Min Fault at D				Operation Time of Relay B at Min Fault at C			Operation Time of Relay A at Min Fault at B			Operation Time of Relay E at Min Fault at A
36	Over Current Setting (PMS):	2		Over Current Setting (PMS):	1			Over Current Setting (PMS):	1		Over Current Setting (PMS):	1		Over Current Setting (PMS):	1
37	Plug Setting Multiplier (PSM):	10		Plug Setting Multiplier (PSM):	6.67			Plug Setting Multiplier (PSM):	11.67		Plug Setting Multiplier (PSM):	11.67		Plug Setting Multiplier (PSM):	11.67
38	Time Multiplier Setting	0.100		Time Multiplier Setting	0.28			Time Multiplier Setting	0.42		Time Multiplier Setting	0.54		Time Multiplier Setting	0.67
39	Time of Operation of Relay	2.97		Time of Operation of Relay	3.62			Time of Operation of Relay	2.78		Time of Operation of Relay	2.78		Time of Operation of Relay	2.78
40	Actual Operaion Time of Relay	0.30		Actual Operaion Time of Relay	1.01			Actual Operaion Time of Relay	1.16		Actual Operaion Time of Relay	1.50		Actual Operaion Time of Relay	1.87
41	Operating Time of Downsteam Relay	0.100		Operating Time of Downsteam Relay	0.10			Operating Time of Downsteam Relay	0.28		Operating Time of Downsteam Relay	0.42		Operating Time of Downsteam Relay	0.54
42	Time Grading:	0.58		Time Grading:	0.28			Time Grading:	0.32		Time Grading:	0.35		Time Grading:	0.38
43	Actual Operaion Time of Relay D at Min Fault at Bus-D	0.8		Actual Operaion Time of Relay C at Min Fault at Bus-C	0.38			Actual Operaion Time of Relay B at Min Fault at Bus-B	0.60		Actual Operaion Time of Relay A at Min Fault at Bus-A	0.77		Actual Operaion Time of Relay E at Min Fault at Bus-E	0.92
44	:Results:			:Results:				:Results:			:Results:			:Results:
45	Pick Up Setting of Over Current Relay (I>):	OK		Pick Up Setting of Over Current Relay (I>):	OK			Pick Up Setting of Over Current Relay (I>):	OK		Pick Up Setting of Over Current Relay (I>):	OK		Pick Up Setting of Over Current Relay (I>):	OK
46	Pick Up Setting of Over Current Relay (I>):	2 A X In		Relay Pick up Setting: (I>)	1 A X In			Relay Pick up Setting: (I>)	1 A X In		Relay Pick up Setting: (I>)	1 A X In		Relay Pick up Setting: (I>)	1 A X In
47	Time Multiplier Setting: (TMS)	0.100	Sec	Time Multiplier Setting: (TMS)	0.278	Sec		Time Multiplier Setting: (TMS)	0.418	Sec	Time Multiplier Setting: (TMS)	0.540	Sec	Time Multiplier Setting: (TMS)	0.674	Sec
48	Expected Operaion Time of Relay:	0.25	Sec	Expected Operaion Time of Relay:	0.83	Sec		Expected Operaion Time of Relay:	1.10	Sec	Expected Operaion Time of Relay:	1.42	Sec	Expected Operaion Time of Relay:	1.78	Sec
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