ECIT-1

ECIT is a series of single-phase combined instrumental digital current and voltage transformers with the following features and advantages:

• ECIT's primary sensors are free from saturation, residual magnetization, and ferroresonance, ensuring accurate current measurements across the entire electrodynamic range.

• ECIT provides high accuracy across a wide range of currents and voltages: 0.5/3P accuracy class in voltage measurements and 0.5S/5PR400(500) accuracy class in current measurements.

• ECIT ensures minimal angular error between current and voltage phasors, enhancing the performance of digital protection relays and control systems.

• ECIT uses a specialized digital filter to compute synchrophasors for current (measurement time: 11 to 16 ms), taking into account the characteristics of the Rogowski coil.

• ECIT publishes two sampled value streams and one synchrophasor (SP) stream to the process bus. The use of the SP stream reduces network load and improves the performance of protection Intelligent Electronic Devices (IEDs).

Sampled Values and Integration

ECIT publishes sampled values (4000, 4800, 12000, and 14400 samples per second) for current and voltage in accordance with IEC 61850-9-2. These values are transmitted to the local Ethernet network ("process bus") and used by digital relay protection terminals, electricity meters, and power quality systems.

Process Bus Connectivity

ECIT connects to a substation’s process bus with RSTP or PRP redundancy or directly to measurement and protection devices.

Protection Features

ECIT includes built-in overcurrent protection with outputs via GOOSE signals or digital outputs (Trip). Synchrophasor data enables advanced protection systems like PDIS, PDIF, and centralized protection in medium-voltage switchgear.

Custom ECIT models rated for up to 35 kV and 800 A, 2500 A, or 4000 A are available upon request.

ECIT accessories are available to order: mounting adapters and a protective cover for the electronic unit.

Software

ECIT-1-15

ECIT-1-24

ECIT-1-35

for medium-voltage electrical installations up to 15 kV

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Primary contacts
2×100Base-FX (supports PRP, RSTP, PTPv2)

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Primary contacts
Power circuits and time synchronization

Functions

Technical specifications

Faq

	ECIT-1-15			ECIT-1-24	ECIT-1-35
Rated primary voltage of application	up to 15 kV			up to 24 kV	up to 35 kV
Rated primary current of application	1000 А	2500 А	4000 А	1600 A	1600 A
Parameters
Rated primary voltage, Upr	(3...16)/√3 kV			(6...24)/√3 kV	(6...36)/√3 kV
Highest voltage for equipment, Um	17.5 kV			26.5 kV	40.5 kV
Minute voltage (50 Hz)	38 kV			60 kV	80 kV
Rated lighting impulse withstand voltage	95 kV			150 kV	190 kV
Partial discharge level	< 20 pC			< 20 pC	< 20 pC
Rated primary current, In	50 А	100 А	100 А	100 А	100 А
Nominal extended primary current, Ipcr	1000 А	2500 А	4000 А	1600 А	1600 А
Rated thermal resistance current (1 s), Ith	25 kA	40 kA	40 kA	40 kA	40 kA
Electrodynamic resistance current, Idyn	63 kA	100 kA	100 kA	63.6 kA	63.6 kA
Voltage accuracy class	0.5/3P			0.5/3P	0.5/3P
Current accuracy class	5PR600	0.5S/5PR450	5PR600	0.5S/5PR450	0.5S/5PR450
Interfaces
Ports	2 × 100Base‑TX or 2 × 100Base‑FX (LC, MM), RS-485
Backup protocols	IEC 62439-3 PRP, RSTP
Exchange protocols	IEC 61850-9-2 (2 × SV (14400 (4800) или 12000 (4000) Гц), 1 × SP (50/100/200/400...4800 fps)), IEEE C37.118.2 (1...400 fps), IEC 61850-8-1 GOOSE, IEC 60870‑5‑104, Modbus TCP, веб-интерфейс
Time sync
	Ethernet: PTPv2 (IEC 61850-9-3), RS-485: IRIG-A/В или 1PPS
Power supply
Voltage and power	18...36 VDC, 10 W
Operating conditions and Design
Operating conditions	–45 (–50)...+50 (+60) °С, RH — up to 98 % (+25 °С), 84…106.7 kPa, 1000 m MSL
Design	143 × 136 × 270 mm, ≤ 4 kg			382 × 178 × 175 mm, ≤ 16 kg

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ECIT-1