ROOTECH - Energy Solution for Human and Nature

Protection Relays
Frequency	50/60 Hz
Sampling rate	64 samples/cycle
Signal processing	4 times/cycle
Voltage/Current signals	Fundamental voltage, fundamental current or RMS current
Current Protection Relays	OCR	Overcurrent relay(50P, 51P)	Instantaneous, Definite time, Inverse time
	OCGR	Overcurrent ground relay(50G, 51G)	Instantaneous, Definite time, Inverse time
	NSOCR	Negative-sequence overcurrent relay(46)	Instantaneous, Definite time, Inverse time
Voltage Protection Relays	OVR	Overvoltage relay(59P)	Definite time, Inverse time
	UVR	Undervoltage relay(27P)	Definite time, Inverse time
	OVGR	Overvoltage ground relay(64G)	Instantaneous, Definite time, Inverse time
	NSOVR	Negative-sequence overvoltage relay(47)	Definite time
Voltage/Current Protection Relays	SGR	Selective ground relay(67GS)	Definite time
Motor Protection Relays	THR	Motor thermal overload relay (49)
	I²t	Motor thermal stress relay (48)
	LSR	Motor long-start relay (48)
	Lock	Motor lock relay (51LR)	Definite time
	UCR	Motor undercurrent relay (37P)	Definite time
	MRI	Motor restart inhibit (66)
Supervision Functions	Cold Load Pickup	Detects the condition where power is restored after an extended interruption to the load’s power supply
		Adjusts the pickup levels of specific protection relay elements over a set period
	Manual Close Blocking	Detects the CLOSE CB (CB ON) command
		Adjusts the pickup levels of specific protection relay elements over a set period
	Inrush Current Detection	Detects high inrush current when applying power to the transformer (based on the ratio of the second-order current to the fundamental current)
		Adjusts the pickup levels of specific protection relay elements during the inrush current detection period
	Breaker Failure	Detects Circuit Breaker(CB) failure based on current magnitude and the CB status signal
		Generates a retrip signal for the CB or a backup trip signal for upstream CBs
	Fuse Failure	Detects failures in the voltage input circuit
		Prevents misoperation of the undervoltage and negative-sequence overvoltage relays
	CT Supervision	Detects failures in the current input circuit
		Prevents misoperation of the undercurrent and negative-sequence overcurrent relays
	Trip/Close Coil Supervision	Detects failures in both the trip and close coil circuits of the CB
		Outputs a failure signal upon detecting a failure
Events	Event log	Records data related to protection relays, monitoring functions, I/O, and control for event analysis
		Stores up to the last 1,000 event logs in non-volatile memory
	Fault record	Stores voltage/current waveforms and RMS or fundamental RMS trends for post-analysis during protection relay operation
		–Stores fault records of up to 500 seconds in non-volatile memory –Can store up to 256 recent fault records –As the duration of individual fault records increases, the number of records that can be stored decreases.
	System event	Records event data related to communication status, configuration changes, and other events
		Stores up to the last 1,000 system events in non-volatile memory
Digital Inputs	Number of channels	8
	Input method	Operated with an external power supply
	Operating voltage	DC 48 V, DC 110 V selectable
	Debounce filter	10 — 500 ms (default 10 ms)
Digital Outputs	Number of channels	6 (Form A), 1 (Form B)
	Output method	Dry contacts (operated with an external power supply)
	Maximum rating	Resistive 10 A 125 V AC, 5 A 250 V AC, 5 A 30 V DC @ Form A
		Resistive 3 A 250 V AC, 3 A 30 V DC @ Form B
Power Digital Outputs	Number of channels	2 Form A channels (used for CB On, Off, and Trip operations)
	Output method	Dry contacts (operated with an external power supply)
	Maximum rating	Resistive 25 A 250 V AC
Measurement
Frequency	Measuring range	42 — 69 Hz
Basic measurement	Measurement cycle (gapless)	0.2 sec (12 cycles @60 Hz, 10 cycles @50 Hz)
	Measurement method	RMS aggregation
Voltage	Sampling rate	512 samples/cycle
	Measurement data	Line-to-neutral voltage, Line-to-line voltage, Fundamental, Harmonics, Phasor diagram, THD
		Symmetrical components (positive-, negative-, zero-sequence components), Unbalance based on symmetrical components or the NEMA standard, Residual voltage
Current	Sampling rate	256 samples/cycle
	Measurement data	Phase current, Fundamental, Harmonics, Phasor diagram, THD, TDD
		Symmetrical components (positive-, negative-, zero-sequence components), Unbalance based on symmetrical components or the NEMA standard, Residual current
Power	Active power, Reactive power, Apparent power
Energy	Active energy	Received, Delivered, Net, Sum energy
	Reactive energy	Energy in quadrants 1, 2, 3 and 4
	Apparent energy
Power quality	Voltage/Current harmonics	Magnitude of each harmonic up to the 50th order, THD, current TDD, Crest factor, K-factor
	Voltage/Current unbalance	Unbalance based on the NEMA standard, negative-/zero-sequence unbalance based on symmetrical components
	Phasor diagram	Voltage/current phasors
	Waveforms	Voltage/current waveforms
		Data provided via communication: 12-cycle waveforms (128 samples/cycle)
		Data displayed on the device’s screen: 2-cycle waveforms (128 samples/cycle)
Power quality events	Dip/Swell	Measures RMS voltage, updated every cycle
		Provides RMS trends for voltage and current
	PQ Curve	Measures RMS voltage, updated every cycle
		Supports SEMI F47-0706, IEC 61000-4-11/34 Class 3, and ITIC Curve
		Provides RMS trends for voltage and current
		Provides PQ curve graphs (including screens that display accumulated data on Dip/Swell events)
	Storage limit	Stores up to the last 1,000 power quality events in non-volatile memory
Aggregation of measurement data	Aggregation intervals	Fixed intervals	Supports 6 fixed intervals (1 sec, 5 sec, 1 min, 5 min, 1 hr, and 6 hrs)
		User-defined intervals	Supports 5 user-defined aggregation intervals
	Aggregation for average values	Average value	Average of values measured at 0.2-second intervals
		Max/Min values	Maximum and minimum values measured at 0.2-second intervals
	Aggregation for the latched value	Last latched value	Provides the last measured data by latching the value
	Data displayed on the LCD screen	Average value	Average of values measured at 0.2-second intervals over a 1-second aggregation period
		Max/Min values	Maximum and minimum values of the average values over a 1-second aggregation period after resetting the values
General
Display	Specifications	5.0” Color TFT-LCD (108.0 x 64.8 mm), RGB 800 x 480 pixels
		Built-in touch panel
	Functions	Displays real-time data on protection relays and measurements and supports device setup
Buttons	Control	LOCAL/REMOTE, FAULT RESET, CB ON, CB OFF
	Menu navigation	HOME, SETUP, EVENT, BACK, METER, RELAY
LED	Status indicators	CB ON, CB OFF, LOCAL/REMOTE, FAULT, METER, RELAY
USB Port	USB Host	Connection to USB memory: Enables backup of fault records and event data.
	USB Device	Connection to AccuraSM: Supports device setup and data backup through Modbus TCP communication.
External communication with the host system	Ethernet communication	Performs communication using the Modbus TCP protocol at 100 Mbps
		Transfers large-capacity data to the host system at high speed
		Two ports enable Ethernet connections between Accura 7300 devices.
		Wiring methods: star, daisy-chain, ring topology (supports RSTP)
	RS-485 communication¹	Performs communication using the Modbus RTU protocol
		1,200 / 2,400 / 4,800 / 9,600 / 19,200 / 38,400 / 57,600 / 115,200 bps

1. At 115,200 bps, a master can communicate with up to 16 slave devices within a maximum distance of 600 m.

Voltage Input
Port name	V1, V2, V3, VN
Connector type	Screw-type terminal block (M3.5x8 / square washer 7.7 mm)¹
Wire specification	Max. 2.5 mm² (14 AWG), copper
Measurement category	III
Input rating	Line-to-neutral 63.5 V, 110 V	Line-to-line 110 V, 190 V
VT primary L-L voltage	50.0 - 999,999.0 V	Default 190.0 V
VT secondary L-L voltage	50.0 - 220.0 V	Default 190.0 V
Rated frequency	50/60 Hz
Burden	0.03 VA/phase @ 110 V L-N
Withstand voltage	AC 2,000 V RMS, 60 Hz for 1 minute
Wiring method	Wye, Delta
Current Input
Port name	I1S-I1L, I2S-I2L, I3S-I3L	S: power supply side, L: load side
Connector type	Screw-type terminal block (M4x9 / flat washer Ø10)¹
Wire specification	Max. 3.3 mm² (12 AWG), copper
Input rating	5 A nominal / 10 A full scale
CT primary current	5 - 99,999 A	Default 50 A
CT secondary current	5 - 10 A	Default 5 A
Burden	0.01 VA/phase @ 10 A
Overload capability	15 A (continuous), 100 A (for 2 seconds), 200 A (for 1 second)
Ground Voltage Input for GVT
Port name	VG, VGC
Connector type	Screw-type terminal block(M3.5x8 / square washer 7.7 mm)¹
Wire specification	Max. 2.5 mm² (14 AWG), copper
Measurement category	III
Burden	0.03 VA @ 110 V
Ground Current Input for GCT
Port name	IGS-IGL	S: power supply side, L: load side
Connector type	Screw-type terminal block (M4x9 / flat washer Ø10)¹
Wire specification	Max. 3.3 mm² (12 AWG), copper
Burden	0.01 VA @ 10 A
Overload capability	15 A (continuous), 100 A (for 2 seconds), 200 A (for 1 second)
Ground Current Input to ZCT
Port name	IZS-IZL	S: power supply side, L: load side
Connector type	Screw-type terminal block (M3.5x8 / square washer 7.7 mm)¹
Wire specification	Max. 2.5 mm² (14 AWG), copper
Overload capability	0.1 A (continuous), 10 A (for 2 seconds)
Digital Inputs
Number of channels	8
Port name	DI.1, DI.2, DI.3, DIG
	DI.4, DI.5, DI.6, DI.7, DI.8, DIG
Connector type	Screw-type terminal block (M3x6 / square washer 6 mm)²
Wire specification	Max. 2.5 mm² (14 AWG), copper
Input method	Operated with an external power supply
Operating voltage	DC 48 V, DC 110 V selectable
Digital Outputs
Number of channels	6 (Form A), 1 (Form B)
Port name	DO.1-DOG.1, DO.2-DOG.2, DO.3-DOG.3, DO.4-DOG.4, DO.5-DOG.5, DO.6-DOG.6 (Form A)
	DO.HF-DOG.HF (Form B)
Connector type	Screw-type terminal block (M3x6 / square washer 6 mm)²
Wire specification	Max. 2.5 mm² (14 AWG), copper
Output method	Dry contacts (operated with an external power supply)
Maximum rating	Resistive 10 A 125 V AC, 5 A 250 V AC, 5 A 30 V DC @ Form A
	Resistive 3 A 250 V AC, 3 A 30 V DC @ Form B
Power Digital Outputs
Number of channels	2 (Form A): used for CB On, Off, and Trip operations
Port name	CBOFF-CBOFFG (CB Off/Trip)
	CBON-CBONG (CB On)
Connector type	Screw-type terminal block (M3x6 / square washer 6 mm)²
Wire specification	Max. 2.5 mm² (14 AWG), copper
Output method	Dry contacts (operated with an external power supply)
Maximum rating	Resistive 25 A 250 V AC
Communication with the Host System
Ethernet communication	Port	2 ports: Ethernet switching, RSTP
	Protocol	Modbus TCP protocol
	Connector type	RJ45 connector
	Communication cable	Ethernet Cat 5e cable (FTP, STP, SFTP)
	Cable length	Up to 100 m
	Bit rate	100 Base-TX (100 Mbps/Full Duplex)
	Wiring method	Star, daisy-chain, and ring topology
	Max. number of connectable modules in a daisy chain	20
RS-485 communication	Port	1 port: Ta, Tb, SG (Shield Ground)
	Protocol	Modbus RTU protocol
	Connector type	Plug-in connector / Push-in with actuator
	Communication cable	UL 2919 RS-485 1P/2P 24 AWG
	Cable length	Up to 1,219 m (4,000 ft)
	Bit rate	1,200 / 2,400 / 4,800 / 9,600 / 19,200 / 38,400 / 57,600 / 115,200 bps
	Max. number of connectable modules	32 per bus
Display & Buttons
LCD	Type	Transmissive type 5.0" Color TFT-LCD (108.0 x 64.8 mm)
	Resolution	800 x 480 pixels
	Additional features	LED backlight & touch panel
Button	CB ON, CB OFF	Used for CB On/Off operations
	LO/RE	Used to switch between Local and Remote modes
	FAULT RESET	Used to reset faults detected by protection relays
	METER, RELAY	Used to select METER and RELAY screens
	HOME, SETUP,EVENT, BACK	Used to view status data on the relay/meter parts, perform device setup, navigate to the event screen, and return to the previous screen
Power Supply
Port name	L+, N-, NC ³
Connector type	Screw-type terminal block (M3.5x8 / square washer 7.7mm)^1,4
Wire specification	Max. 2.5 mm² (14 AWG), copper
Rated voltage(Us)	100 — 240 V AC 50/60 Hz, 100 — 300 V DC, CAT III
Operating voltage range	0.9 x Us — 1.1 x Us
Rated power consumption	Max. 15 VA (AC 220 V, 25 °C)
Withstand voltage	AC 2,000 V RMS, 60 Hz for 1 minute
Operating environment	Pollution degree 2
Inrush current	Peak 31 A, duration no more than 1 msec (AC 220 V)
	Peak 11 A, duration no more than 0.2 msec (DC 110 V)
External input fuse⁵	Class RK5 or higher, 2 A, 500 V

1. The maximum screw tightening torque of the barrier-type terminal block is 0.98 Nm (10 kgf-cm, 8.7 lbf-in).
2. The maximum screw tightening torque of the barrier-type terminal block is 0.78 Nm (8.0 kgf-cm, 6.9 Ibf-in).
3. NC: No Connection
4. Use UL-listed lugs when connecting wires to the terminal block.
5. For power line installations, use UL-listed fuses with an RK5 class or higher, rated at 2 A/500 V.