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Sepam Series

Digital Protective Relay

80, 40, and 20 Series

The Sepam family of digital protection units, Series 20, 40 and 80, is the newest generation of Sepam relay, a time tested product with a 20-year worldwide history. Modular relay design allows quick and easy future upgrades to communications, digital I/O, analog output or temperature acquisition. The 64x128 bit, graphic LCD display and keypad permit basic relay setting of Series 20 and 40 without a PC. Comprehensive self-testing provides assurance of readiness to protect. The Sepam family also has exceptional withstand to environmental electromagnetic disturbances. An optional 128 x 240 LCD display can show one-line or electrical vectors.

 

Table 4.32:

Quick Select Guide

		Feeder or main (Substation)	Transformer	Motor	Generator	Bus	Capacitor Bank
Criteria	Selection
Network structure	Radial (51, 51N, 46)	S23	T23	M20	G40	B80	C86
	Long feeders (67N)	S41		M41
	Closed loop (67N, 67)	S42
	Parallel mains [transf] [sources] (67N, 67)	S42	T42		G82
	Sync-check required (25)(67N, 67)	S82	T82		G82	B80
Grounding system	Solid or low/high impedance (51N)	S23	T23	M20	G40
	Ungrounded or compensated (67N/NC)	S41	T42	M41	G82
Protection	Basic Feeder [Transf][Motor] [Generator]	S23	T23	M20	G40
	Voltage/frequency (27/59/81)	S40	T40	M41	G40	B21
	ROCOF (81R)	S84				B22
	Advanced Fdr/Main[Transf] [Motor][Gen]	S41	T82	M81	G82	B83
	Thermal overload (49)-cable	S81
	Thermal O/L (49)- capacitor bank						C86
	Differential (87T)		T87
	Machine differential (87M)			M87	G87
	Machine- transformer unit differential (87T)			M88	G88
Metering	I	S23	T23	M20
	V, f					B21
	I, V, f, P, E	S40	T40	M41	G40	B80
	I, V, V, f, P, E					B83
	I, I, V, F, P, E		T87	M87	G87
	THD-I, THD-V	S80	T81	M81	G82	B80
Temperature	<8 RTDs of same type		T23	M20	G40
	> 8 RTDs (< 16) or 2 types of RTDs		T40	M41	G40
I/Os	< 10 I / 8 O	S23	T23	M20	G40	B21
	> 10 I / 8 O and < 42 I / 23 O	S80	T81	M81	G82	B80
Program logic customization	Control matrix	S23	T23	M20	G40	B21
	Logic equation editor	S40	T40	M41	G40	B80
	Ladder-logic software	S80	T81	M81	G82	B80