Main traction network monitoring and protection system SMTN-3 technical parameters

Name of parameter	Unit of measurement	Value
Main parameters
Number of current measuring channels	pc.	1
Number of voltage measuring channels	pc.	1
Type of current sensor	-	Shunt
Power circuit voltage measuring range	V	-2000...+2000* -8000...+8000*
Input voltage range for power circuit current measuring channel (DC generated voltage on shunt)	V	-0,5...+0,5
Current measuring range where: Ish — shunt rated current; Ush — voltage drop on shunt under rated current.	А	Imax= ± (0,4•Ish)/Ush
Measured values sampling period	mks	50
Current measuring accuracy, max, of Ish	%	0,5
Voltage measuring accuracy, max, of measuring range	%	0,5
Insulation strength between measuring module power circuit and power supply circuit, minimum	kV	10 (30)*
Measured values
-	-	- Current (current channel); - Voltage (voltage channel); - Power (calculated); - Energy (calculated); - Test current (Line tester channel);
External signals
Number of high speed digital outputs	pc.	5
Digital outputs designation	-	Signals issuing is set individually for each output under one or several protection functions tripping
Number of digital inputs	pc.	5
Digital inputs designation	-	Set individually for each input: - HSCB condition control; - external opening signal; - time synchronization.
Power supply
Rated operating voltage	V	⎓5; 12; 24 ; 48, 110; 220 ≂110; 220
SMTN-3 system max consumed power, max	W	15
Permissible voltage long-term tolerances	%	-15…+10
Communication interfaces
Data transfer interface	-	Ethernet
Data transfer protocols	-	WEB technologies ModBus TCP/IP
Reliability
Mean time between failures (MIL-HDBK-217F)	hours	100 000
Total average lifetime (under condition of the required technical maintenance activities provision)	years	25
Design
Protection degree of modules in acc. with IEC/EN 60 529/VDE 0470-1	-	IP 3X
Cooling	-	natural, air
Type of modules mounting	-	DIN-rail (TH 35, DIN 46277-3 (EN 50022)
Protection functions
Code ANSI	50 76 59 27 49 BF	- Instantaneous overcurrent; - Overcurrent protection; - Current rate of rise protection; - Current increment directional protection; - Overvoltage protection; - Undervoltage protection; - Thermal protection; - Breaker failure.
Period of data processing by protective functions algorithms	mks	50
Number of settings groups		2
Measuring and logging functions
Measured values	-	- Current; - Voltage; - Power; - Energy; - HSCB tripping counter; - Test current (line tester channel).
Number of recorded oscillograms under emergency event** occurrence	pc.	2 - “Fast track” - “Slow track”
Emergency oscilligraph records coverage width	-	- Current curve; - Voltage curve; - Digital inputs and outputs state diagram; - Astronomical time; - Type of tripped protection.
Emergency oscilligraph records coverage depth	points	2048 (for each measured value)
Signals sampling frequency in “Fast track” record	kHz	20
Signals sampling period in “Slow track” record	Hz	10
“Fast track” record time coverage depth	ms	100
“Slow track” record time coverage depth	s	100
Prehistory *** record time coverage depth in “Fast track” record	points	Set 0 - 2048
Prehistory *** record time coverage depth in “Slow track” record	points	Set 0 - 2048
Number of emergency oscillograph stored records	-	200
Local human interaction interfaces
-	-	LCD touch-screen or LED indication and control element
Operating conditions
Ambient temperature range	°C	+1…+60
Relative air humidity, under temperature (upper value)	%	60, 20°C (80, 25°C)

* - depending on measuring module design, for application in city electric transport with traction network voltage up to 1000 V or for application
in railway transport with traction network voltage up to 4000 V
**- one of protections tripping is considered to be emergency event
*** - prehistory is a diagram of measured values up to emergency event occurrence