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ENMU

ENMU is a multifunctional merging unit with digital inputs and outputs, that can serve as a digital fault recorder and a phasor measurement unit.

ENMU complies with IEC 61869-13 stand-alone merging unit standard.

The merging unit digitizes input signals and publishes up to 4 streams of IEC 61850-9-2 sampled values (SV) to the process bus for protection and measurement devices to subcribe to. High sample rate streams can be used for energy metering and power quality monitoring by ESM smart meters.

ENMU synchronizes the data using IEEE 1588v2 PTP.

The modification with built-in digital inputs and outputs provides remote monitoring and control via IEC 61850-8-1 (MMS, GOOSE). The number of digital and analog signals processed can be increased by connecting external devices such as ENMV-1.

ENMU provides IEEE C37.118 phasor measurements.

ENMU records fault oscillograms and phasor measurements.

Pairs of interfaces for publishing SV streams, and communication via IEC 61850-8-1 (MMS, GOOSE) can operate in IEC 62439-3 PRP redundancy mode.

Datasheet

Analog inputs / accuracy

4 voltage inputs U: 2...200% Urated(57.7 V), 0.2%;

4 inputs CT measuring: 1...200% Irated(1/5 A), 0.2%;

3 inputs CT measuring: 10...4000% Irated(1/5 A), 5%;

IEC 61869-13: 0.2, 0.2DR5-200, 6TPM40, Tp = 120 ms

Sampled Values

2 × SV80/96 (protection), 2 × SV256/288 (measuring)

Digital inputs

16 inputs: 220 VDC, adjustable thresholds;

programmable logic expressions (AND, OR, XOR, CMP, RS FF)

Digital outputs

10 outputs: 3 × DO SSR, 7 × DO EMR or 8 outputs: 3 × DO TRIP, 5 × DO EMR

DO EMR — 400 VAC 6 A, 220 VDC 0.45 A, 6 ms;
DO SSR — 400 VDC 1.35 A, 5 ms;

DO TRIP — 250 VDC 10(40) A, 1 ms

Fault recorder

sampling rate up to 14,4 kHz, 8 GB storage, FTP access

Interfaces and protocols

USB + please see ordering information / IEC 61850-9-2, IEC 61850-8-1 (ed. 1), IEEE C37.118.2, IEC 60870-5-104, IEC 60870-5-101, IEEE 1588v2 PTP (time sync)

Power supply

120...370 VDC or 100...265 VAC (47...63 Hz), 30 VA

Operating conditions and design

–40...+70 °С; 303 × 254 × 100 мм, IP20