ECIT-1

ECIT-1 is a family of single-phase combined current and voltage instrument transformers designed for medium-voltage applications (from 3 to 35 kV). Featuring digital outputs, ECIT-1 serves as a data source for measurement, protection, and automation devices.

Key Advantages

Unlike conventional instrument transformers, ECIT-1 is immune to ferroresonance, residual magnetization, and saturation. It delivers accurate measurements across the entire electrodynamic range.
A single ECIT-1 modification ensures high accuracy measurements across varying operating currents and voltages within its specified range.

Digital Outputs & Communication

ECIT-1 supports two configurable sampled value (SV) streams for current and voltage, compliant with IEC 61869‑9 and suitable for metering, energy measurement, and protection devices.
One of the three transformers can subscribe to SV streams from other phases, combine them, and publish a three-phase SV stream.

Optionally, ECIT-1 can publish a synchrophasor (SP) stream intended for protection and automation applications. SP streams provide synchronized phasor measurements in accordance with IEC 61850-9-2. Combining single-phase SP streams into a three-phase stream is also supported.

Using SP streams reduces network traffic while maintaining the effectiveness and response speed of most protection functions.

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

ECIT-1-15

ECIT-1-24

ECIT-1-35

for medium-voltage electrical installations up to 15 kV

ECIT-1-15-1000 Комбинированный измерительный трансформатор

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Primary contacts
2 × Ethernet 100Base-TX(FX)

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Primary contacts
2 × Ethernet 100Base-TX(FX)

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Primary contacts
Power circuits and time synchronization

Functions

Technical specifications

Support

Faq

Modification	ECIT-1-	15-50(1000)	15-100(2500)	15-100(4000)	24-100(1600)	35-100(1600)
Voltage Class		up to 15 kV	up to 15 kV	up to 15 kV	up to 24 kV	up to 35 kV
Rated primary current, I_n		50 A	100 A	100 A	100 A	100 A
Current accuracy class		0.5S/5PR500	0.5S/5PR400	0.5S/5PR400	0.5S/5PR400	0.5S/5PR400
Rated primary current up to		1000 А	2500 А	4000 А	1600 А	1600 А
Rated short-time thermal current, I_th		25 kA/1 s	40 kA/1 s	40 kA/1 s	40 kA/1 s	40 kA/1 s
Rated dynamic current, I_dyn		63 kA	100 kA	100 kA	100 kA	100 kA
Rated primary voltage, U_pr		(3...16)/√3 kV	(3...16)/√3 kV	(3...16)/√3 kV	(6...24)/√3 kV	(6...36)/√3 kV
Voltage accuracy class		0.5/3P	0.5/3P	0.5/3P	0.5/3P	0.5/3P
Rated primary voltage up to, U_m		17.5 kV	17.5 kV	17.5 kV	26.5 kV	40.5 kV
Rated lighting impulse withstand voltage		95 kV	95 kV	95 kV	150 kV	190 kV
Rated short-duration power frequency withstand voltage (1 min)		38 kV	38 kV	38 kV	60 kV	80 kV
Design dimensions, mm weight, kg		127 × 136 × 270 ≤ 4	126 × 160 × 304 ≤ 7	320 × 160 × 304 ≤ 9	175 × 178 × 382 ≤ 12	142 × 178 × 470 ≤ 15
Sampling rate, Hz		14400, 12000
Interfaces		2 × 100Base‑TX (FX LC MM), RSTP, IEC 62439-3 PRP
Protocols		IEC 61850-9-2: 2 × SV (4800, 14400 fps), optional SP (50...4800 fps), IEEE C37.118.2 (1...400 fps), IEC 61850-8-1 GOOSE, IEC 60870‑5‑104, Modbus TCP, web interface
Binary output		125 VAC 0.5 A, 24 VDC 1 A, switching time 5 ms
Time sync		PTPv2 (IEC 61850-9-3), IRIG-A (RS-485)
Disturbance recording		10 records (1+4 s), sampling rate 2400 or 2000 Hz
Relay protection		PVOC, PIOC
Optional		Extended protection and automation suite: PVOC/PDOC, PIOC, SARC, PTEF/PDEF, PTUV, PPBR, RBRF, Busbar Blocking logic, Dead/Live line detection Publication SP, merging SP Three-phase energy metering
Power supply		18...36 VDC, 10 W
Operating conditions		-45(-50)…+50(+60) °С, RH — up to 98 % (+25 °С), 84…106.7 kPa, 1000 m above sea level

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ECIT-1