Atec CMC-256-Plus User Manual

CMC 256plus

CMC 256plus: 6 Phase Current + 4 Phase Voltage Test Set and Universal Calibrator

The CMC 256plus is the first choice for applications requiring very high accuracy. This unit is not only an excellent test set for protection devices of all kinds but also a universal calibration tool. Its high precision allows the calibration of a wide range of measuring devices, including: electricity meters of class 0.2, measuring transducers, power quality measurement devices and phasor measurement units (PMU). Its unique accuracy and flexibility make the CMC 256plus ideal for protection and measurement equipment manufacturers for research and development, production and type testing. The CMC 256plus can either be operated by the Test Universe software running on a PC or by the front panel control device CMControl.

Technical Data

Current generators

Setting range 6-phase AC (L-N)

Power 6-phase AC (L-N)

Accuracy

Distortion (THD+N) Ranges 1.25 A / 12.5 A (Group A, B) or

Resolution (for respective range) Max. compliance voltage (L-N)/(L-L) Connection 4 mm (0.16 in) banana sockets / combination

All data specified are guaranteed, except where indicated otherwise.

OMICRON guarantees the specified data for one year after factory calibration,

within 23 °C ±5 °C (73 °F ±10 °F) in the frequency range from 10 to 100 Hz and after a warm-up phase > 25 minutes

Rload: 0 ... 0.5 W

rd. = reading, rg. = range

THD+N: Values at 50/60 Hz, > 1 A / 20 V with 20 kHz bandwidth

Rload: > 250 W

Amplitude derating at > 1000 Hz

Data are valid from 0.1 to 12.5 A (current amplifier A or B) and 50 to 300 V

(voltage amplifier) at 50/60 Hz

Permissible load for current outputs:

Range 1.25 A: 0 to 1 W and 1 VA max., cos ϕ = 0.5 to 1 Range 12.5 A: 0 to 0.5 W and 6 VA max., cos ϕ = 0.5 to 1 Permissible load for voltage outputs:

10 VA max. at 50 to 300 V, cos ϕ = 0.5 to 1

6 x 0 ... 12.5 A 3-phase AC (L-N) 1-phase AC (3L-N) DC (3L-N)

3 x 0 ... 25 A (Group A II B)

1 x 0 ... 75 A (Group A II B), 2 x 0 ... 37.5 A

1 x 0 ... ±35 A (Group A II B), 2 x 0 ... ±17.5 A

6 x 80 VA typ. at 8.5 A, 6 x 70 VA guar. at 7.5 A 3-phase AC (L-N) 3 x 160 VA typ. at 17 A (Group A II B)

3 x 140 VA guar. at 15 A (Group A II B) 1-phase AC (3L-N) 1 x 480 VA typ. at 51 A (Group A II B),

2 x 240 VA at 25.5 A

1 x 420 VA guar. at 45 A (Group A II B),

2 x 210 VA at 22.5 A 1-phase AC (L-L) 1 x 320 VA typ. at 8.5 A (Group A II B),

2 x 160 VA at 8.5 A

1 x 280 VA guar. at 15 A (Group A II B),

2 x 140 VA at 7.5 A 1-phase AC (L-L-L-L) 1 x 320 VA typ. at 8.5 A

(40 VRMS, Group A and B in series)

1 x 280 VA guar. at 7.5 A

(40 VRMS, Group A and B in series) DC (3L-N) 1 x 480 W typ. at ±35 A (Group A II B),

2 x 240 W at ±17.5 A

1 x 470 W guar. at ±35 A (Group A II B),

2 x 235 W at ±17.5 A

Group A and B in series

1-phase AC (L-L)

3-phase AC (L-N)

Output current / A

1-phase AC (L-N)

500 400 300 200 100

0 10 25 50 75

Output power (typ.) / VA

error < 0.015 % rd.3 + 0.005 % rg.3 typ.

at 0 ... 12.5 A

error < 0.04 % rd. + 0.01 % rg. guar.

at 0 ... 12.5 A

< 0.025 % typ., < 0.07 % guar.

2.5 A / 25 A (Group A II B)

50 µA / 100 µA / 500 µA / 1 mA

15 Vpk / 60 Vpk

socket (Group A only)

Voltage generators

Setting range 4-phase AC (L-N) 4 x 0 ... 300 V (VL4(t) automatically

3-phase AC (L-N) 3 x 0 ... 300 V 1-phase AC (L-L) 1 x 0 ... 600 V DC (L-N) 4 x 0 ... ±300 V

Power 3-phase AC (L-N) 3 x 100 VA typ. at 100 ... 300 V

4-phase AC (L-N) 4 x 75 VA typ. at 100 ... 300 V

1-phase AC (L-N) 1 x 200 VA typ. at 100 ... 300 V

1-phase AC (L-L) 1 x 275 VA typ. at 200 ... 600 V

DC (L-N) 1 x 420 W typ. at ±300 V

300 250 200 150 100

4-phase AC (L-N)

0 100 200 300 400 500 600

Output power (typ.) / VA

Accuracy

Distortion (THD+N)

Ranges 150 V / 300 V Resolution 5 mV / 10 mV in range 150 V / 300 V Connection 4 mm (0.16 in) banana sockets /

Generators, general

Frequency range sine signals 10 ... 1000 Hz

range harmonics / interharmonics

range transient signals accuracy / drift ±0.5 ppm / ±1 ppm resolution < 5 µHz

Phase angle range -360° ... +360°

resolution 0.001°

error at 50 / 60 Hz < 0.005° typ., < 0.02° guar. Bandwidth (-3 dB) 3.1 kHz Simulated power

accuracy

S, P (calibration of energy meters)

temperature drift < 0.001 % / °C typ., < 0.05 % / °C guar.

calculated: VL4 = (VL1+VL2+VL3)*c or freely programmable)

3 x 85 VA guar. at 85 ... 300 V

4 x 50 VA guar. at 85 ... 300 V

1 x 150 VA guar. at 75 ... 300 V

1 x 250 VA guar. at 200 ... 600 V

1 x 360 W guar. at ±300 V

1-phase AC (L-L)

1-phase AC (L-N)

3-phase AC (L-N)

Output voltage / V

error < 0.015 % rd.3 + 0.005 % rg.3 typ. at 0 ... 300 V error < 0.04 % rd. + 0.01 % rg. guar. at 0 ... 300 V

0.015 % typ., < 0.05 % guar.

combination socket (1,2,3,N)

10 ... 3000 Hz

DC ... 3.1 kHz

error < 0.05 % rd. typ., < 0.1 % rd. guar.

Low level outputs

Number of outputs

6 (12 with Option LLO-2) Setting range 0 ... ±10 Vpk Max. output current 1 mA Accuracy error < 0.025 % typ., < 0.07 % guar.

at 1 ... 10 Vpk Resolution 250 µV Distortion (THD+N)

< 0.015 % typ., < 0.05 % guar. Unconventional CT/VT simulation linear, Rogowski (transient and sinewave) Overload indication yes Isolation SELV Usability completely independent from internal

amplifier outputs Connection 16 pin combination socket (rear side)

Auxiliary DC supply

Voltage ranges 0 ... 264 VDC, 0.2 A / 0 ... 132 VDC,

0.4 A / 0 ... 66 VDC, 0.8 A Power max. 50 W Accuracy error < 2 % typ., < 5 % guar. Connection 4 mm (0.16 in) banana sockets

Binary inputs

Number 10 Trigger criteria Toggling of potential-free contacts or DC

voltage compared to threshold voltage

Input characteristics 0 ... ±600 VDC threshold or

potential-free Ranges 100 mV / 1 V / 10 V / 100 V / 600 V Resolution of threshold ±2 mV, ±20 mV, ±200 mV, ±2 V,

±20 V in ranges Sample rate 10 kHz (resolution 100 µs) Time stamping accuracy ±0.00015 % of rd.

±70 µs Max. measuring time infinite Debounce / Deglitch time 0 ... 25 ms / 0 ... 25 ms Counting function < 3 kHz at pulse width > 150 µs Galvanic isolation 5 galvanically isolated groups

(2+2+2+2+2)

Max. input voltage CAT IV / 150 V, CAT III / 300V, CAT II /

600 V (850 Vpk)

Connection 4 mm (0.16 in) banana sockets

Counter inputs 100 kHz

Number 2 Max. counting frequency 100 kHz Pulse width > 3 µs Threshold voltage 6 V Voltage hysteresis 2 V Max. input voltage ±30 V Isolation SELV Connection 16 pin combination socket (rear side)

Trigger on overload

Supported generators Current generators Timer accuracy error < 1 ms

Binary outputs, relays

Type potential-free relay contacts, software

controlled Number 4 Break capacity AC Vmax: 300 VAC / Imax: 8 A /

Pmax: 2000 VA Break capacity DC Vmax: 300 VDC / Imax: 8 A /

Pmax: 50 W Connection 4 mm (0.16 in) banana sockets

Binary outputs, transistor

Type open collector transistor outputs Number 4 Update rate 10 kHz Imax 5 mA Connection 16 pin combination socket (rear side)

DC voltage measuring input

Measuring range 0 ... ±10 V Accuracy error < 0.003 % rg.

typ.,

< 0.02 % rg. guar. Input impedance 1 MW Connection 4 mm (0.16 in) banana sockets

DC current measuring input

Measuring range 0 ... ±1 mA, 0 ... ±20 mA Accuracy error < 0.003 % rg.

typ.,

< 0.02 % rg. guar. Input impedance 15 W Connection 4 mm (0.16 in) banana socket

Analog AC+DC measuring inputs

Type AC + DC analog voltage inputs

(current measurement with external

current clamps or shunt resistors) Number 10 Nominal input ranges (RMS values) 100 mV, 1 V, 10 V, 100 V, 600 V Amplitude accuracy error < 0.06 % typ., < 0.15 % guar. Bandwidth DC ... 10 kHz Sampling frequency 28.44 kHz, 9.48 kHz, 3.16 kHz Input impedance 500 kW // 50 pF Transient input buffer at 28 kHz 3.5 s for 10 input channels / 35 s for 1

input channel Transient input buffer at 3 kHz 31 s for 10 input channels / 5 min. for 1

input channel Transient trigger threshold voltage, power quality trigger:

sag, swell, harmonic, frequency,

frequency change, notch Measurement functions I (AC + DC), V (AC + DC), phase,

frequency, power, harmonics,

transient recording, event recording,

trend recording Input overload indication yes Input protection yes Max. input voltage CAT IV / 150 V, CAT III / 300V, CAT II /

600 V (850 Vpk) Galvanic isolation 5 groups (2+2+2+2+2) Connection 4 mm (0.16 in) banana sockets

(combined with binary inputs)

Time Synchronization

Timing accuracy

IRIG-B synchronization with CMIRIG-B GPS synchronization with CMGPS

error < 1 µs typ., < 5 µs guar.

error < 1 µs typ., < 5 µs guar. To external voltage Reference signal on binary input 10:

10 ... 300 V / 40 ... 70 Hz With the unique PermaSync functionality (supported by TU 2.30 or higher), analog and Sampled Values outputs stay permanently in sync with the internal CMC time reference. In combination with the optional CMIRIG-B interface box, PermaSync additionally allows the continuous synchronization of the output quantities with an external IRIG-B time protocol or an external PPS signal. With CMIRIG-B it is also possible to transmit the internal PPS signal of the CMC to the device under test (e.g. PMUs or IEDs stimulated with a synchronized Sampled Values data stream).

For directly testing relays with low level inputs by simulating signals from non

conventional CTs and VTs with low level interfaces and for controlling external amplifier units

THD+N: Values at 50/60 Hz, 20 kHz measurement bandwidth, nominal value, and

nominal load

rd. = reading, rg. = range

Up to three inputs can be used for measuring RMS values, frequency, and phase

angle without the EnerLyzer software license. Full functionality requires EnerLyzer software license

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