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	Thermal overload relay (49)
	I²t	Thermal stress relay (48)
	LSR	Long start relay (48)
	Lock	Lock relay (51LR)	Definite time
	UCR	Undercurrent relay (37P)	Definite time
	MRI	Motor restart inhibit (66)
Supervision Functions	Cold Load Pickup	Detects when power is restored after an extended interruption to the load’s power supply
		Adjusts the pickup levels of specific protection relay elements for a set period
	Manual Close Blocking	Detects the CLOSE CB (CB ON) command
		Adjusts the pickup levels of specific protection relay elements for a set period
	Inrush Current Detection	Detects high inrush current when the transformer is energized (based on the ratio of the 2nd-harmonic 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 the current magnitude and 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 when a failure is detected
Events	Event log	Records data related to protection relays, monitoring functions, I/O, and control functions for event analysis
		Stores up to 1,000 of the most recent event logs in non-volatile memory
	Fault record	Stores voltage/current waveforms and RMS or fundamental RMS trends for post-analysis of protection relay operation
		- Stores up to 500 seconds of fault records 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, self-diagnosis, and other events
		Stores up to 1,000 of the most recent system events in non-volatile memory
Digital Inputs	Number of channels	8
	Input method	Powered by 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 (powered by 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 Output	Number of channels	2 (Form A): Used for CB On, Off and Trip operations
	Output method	Dry contacts (powered by an external power supply)
	Maximum rating	Resistive 25 A 250 V AC
Measurement (Meter)
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 component, harmonics, phasor diagram, THD
		Symmetrical components (positive-, negative-, and 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-, and 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- and zero-sequence unbalance based on symmetrical components
	Phasor diagram	Voltage and current phasors
	Waveforms	Voltage and current waveforms
		Provides 12-cycle waveforms (128 samples/cycle) via communication
		Displays 2-cycle waveforms (128 samples/cycle) on the device screen
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 dip/swell event data
	Storage limit	Stores up to 1,000 of the most recent power quality events in non-volatile memory
Aggregation of measurement data	Aggregation intervals	Fixed intervals	Supports 6 predefined intervals (1 s, 5 s, 1 min, 5 min, 1 h, and 6 h)
		User-defined intervals	Supports 5 user-defined aggregation intervals
	Aggregation of average values	Average value	Average of values measured at 0.2-s intervals
		Max/Min value	Maximum/Minimum values measured at 0.2-s intervals
	Aggregation of the latched value	Last latched value	Stores the last measured value using a latching function
	Data displayed on the LCD screen	Average value	Average of values measured at 0.2-s intervals over a 1-s aggregation period
		Max/Min values	Maximum and minimum values of the 1-s averaged data since the last reset
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 protection relay and measurement data 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 OFF¹
		LOCAL/REMOTE, FAULT, METER, RELAY
USB Port	USB Host	Connection to a USB memory device: Enables backup of fault records, event data, and screenshots.
	USB Device	Connection to AccuraSR: Supports device setup and data backup via Modbus TCP communication.
External communication with the host system	Ethernet communication	Communicates using the Modbus TCP protocol at 100 Mbps
		Transfers large amounts of data to the host system at high speed
		Two ports enable Ethernet connections between Accura 7300 devices.
		Wiring mode: star, daisy-chain, ring topology (supports RSTP)
	RS-485 communication²	Communicates using the Modbus RTU protocol
		1,200 / 2,400 / 4,800 / 9,600 / 19,200 / 38,400 / 57,600 / 115,200 bps
Screen capture	Screenshot storage	Captures the currently active screen and stores it in internal memory
		Stores up to 100 screenshots
		Captures the screen when the SETUP and EVENT buttons are pressed simultaneously for more than 2 seconds. A buzzer sounds when the capture is complete.
	Screenshot backup	Backs up screenshots to a USB storage device

1. The CB ON/OFF LED state is determined by the CB 52a/CB 52b digital inputs (DIs). For details, refer to the Accura 7300 User Guide.
2. At 115,200 bps, a master can communicate with up to 16 slave devices within a maximum distance of 600 m.

Accura 7300 Smart Digital Protection Relay

Voltage Input
Port name	V1, V2, V3, VN
Connector type	Screw-type terminal block (M3.5x8, square washer: 7.7 mm) ^{1, 2}
Wire specification	Max. 2.5 mm² (14 AWG), copper
Measurement category	III
Input rating	L-N 63.5 V, 110 V	L-L 110 V, 190 V
VT primary L-L voltage	50.0 - 999,999.0 V	Default: 190.0 V ³
VT secondary L-L voltage	50.0 - 220.0 V	Default: 190.0 V ³
Frequency range	42 - 69 Hz
Burden	0.03 VA/phase @ L-N 110 V
Withstand voltage	AC 2,000 V RMS, 60 Hz for 1 minute
Wiring method	Wye connection, Delta connection
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, 2}
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 (2 seconds), 200 A (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, 2}
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, 2}
Wire specification	Max. 3.3 mm² (12 AWG), copper
Burden	0.01 VA @ 10 A
Overload capability	15 A (continuous), 100 A (2 seconds), 200 A (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, 2}
Wire specification	Max. 2.5 mm² (14 AWG), copper
Overload capability	0.1 A (continuous), 10 A (2 seconds)
Digital Inputs
Number of channels	8
Port name	DI.1, DI.2, DI.3, DIG ⁴
	DI.4, DI.5, DI.6, DI.7, DI.8, DIG ⁴
Connector type	Screw-type terminal block (M3x6, square washer: 6 mm) ⁵
Wire specification	Max. 2.5 mm² (14 AWG), copper
Input method	Powered by an external power supply
Operating voltage	DC 48 V / DC 110 V selectable (default: DC 110 V)
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) ⁵
Wire specification	Max. 2.5 mm² (14 AWG), copper
Output method	Dry contacts (powered by 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) ⁵
Wire specification	Max. 2.5 mm² (14 AWG), copper
Output method	Dry contacts (powered by an external power supply)
Maximum rating	Resistive 25 A 250 V AC
Communication with the Host System
Ethernet communication	Port	Ethernet1, Ethernet2 ⁶
	Protocol	Modbus TCP protocol
	Connector type	RJ45 connector
	Communication cable	Ethernet Cat 5e cable (FTP, STP, SFTP) ⁷
	Cable length	Up to 100 m
	Bit rate	100 Base-TX (100 Mbps/Full Duplex)
	Wiring method	Star, daisy-chain, ring topology: RSTP support ⁸
	Max. number of connectable modules in a daisy chain	20
RS-485 communication	Port	Ta, Tb, SG (Shield Ground) ⁹
	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 ¹⁰
	Max. number of connectable modules	32 per bus ¹⁰
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 and touch panel
Button	CB ON, CB OFF	Used for CB control and LED status display ¹¹
	LO/RE	Used for LOCAL/REMOTE selection and LED status display
	FAULT RESET	Used for fault reset control and LED status display
	METER, RELAY	Used for the relay or meter part selection and LED status display
	HOME, SETUP, EVENT, BACK	Used for screen navigation
Power Supply
Port name	L+, N-, NC ¹²
Connector type	Screw-type terminal block (M3.5x8, square washer: 7.7 mm) ^{1, 2}
Wire specification	Max. 2.5 mm² (14 AWG), copper
Rated voltage (Us)	AC 100 - 240 V 50/60 Hz, DC 100 - 300 V, 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 ms (AC 220 V)
	Peak 11 A, duration no more than 0.2 ms (DC 110 V)
External input fuse¹³	Class RK5 or higher, 2 A, 500 V

1. The screw tightening torque of the barrier-type terminal block is 0.98 Nm (10 kgf-cm, 8.7 lbf-in).
2. Use UL-listed lugs when connecting wires to the terminal block.
3. When wiring without a VT, set the VT primary and secondary voltages to the same value (1:1 ratio).
4. The DIG ports in columns C and D on the rear panel are electrically isolated from each other; therefore, caution is required when wiring.
5. The screw tightening torque of the barrier-type terminal block is 0.78 Nm (8.0 kgf-cm, 6.9 lbf-in).
6. The built-in Ethernet switch enables Ethernet connections between Accura 7300 devices without requiring an external switch.
7. FTP (Foiled Shielded Twisted Pairs), STP (Braided Shielded Twisted Pairs), SFTP (Braided Foiled Shielded Twisted Pairs)
8. RSTP (Rapid Spanning Tree Protocol), IEEE 802.1D-2004.
9. The SG terminal is internally connected to the protective grounding terminal.
10. At 115,200 bps, a master can communicate with up to 16 slave devices within a maximum distance of 600 m.
11. The CB ON/OFF LED state is determined by the CB 52a/CB 52b digital inputs (DIs). For details, refer to the Accura 7300 User Guide.
12. NC: No Connection
13. When installing fuses in the power input line, it is recommended to use UL-listed Class RK5 or higher-class fuses, rated at 2 A/500 V.

General Specifications

Environmental Conditions
Operating temperature	-20 - 60 ℃ (-4 - 140 ℉)
Storage temperature	-40 - 85 ℃ (-40 - 185 ℉)
Operating humidity	5 - 95 % (non-condensing)
Operating altitude	Up to 2,000 m
Operating environment	Pollution degree 2
Ingress protection against dust and water	IEC 60529 IP40
General
Warranty period	2 years