The CMC 356 is the universal solution for testing all generations and types of protection relays. Its powerful six current sources (three-phase mode: up to 64 A / 860 VA per channel) with a great dynamic range, make the unit capable of testing even high-burden electromechanical relays with very high power demands.
The CMC 356 is the first choice for applications requiring the highest versatility, amplitude and power. Commissioning engineers will particularly appreciate its ability to perform wiring and plausibility checks of current transformers, by using primary injection of high currents from the test set.
Recommended for tests requiring
- higher currents/power in the current path.
- more than 3/6 current channels (e.g. for testing 3-winding transformer differential protection).
The CMA 156 contains 6 independent current channels, arranged in two isolated groups (A, B). By connecting all six current phases in parallel, for example, a power of up to 420 VA and current up to 150 A can be delivered, which allows testing a wide range of electromechanical relays.
| Key Features |
| Powerful current sources for testing even high-burden electromechanical relays |
| High current amplitudes for 5 A relay testing |
| High accuracy and versatility for testing static and numerical relays of all types |
| Integrated network for testing IEC 61850 IEDs |
| 10-channel analog measurement and transient recording functionality (option) |
| Specifications |
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| Omicron VEHV1010 |
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| Technical Data |
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| Current generators/-amplifiers1 |
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| Features | Parameter |
| Setting Range | 6-phase ac (L-N) | 6 x 0 ... 25 A |
| 3-phase ac (L-N) | 3x 0 ... 50 A (Group A II B) |
| 1-phase ac (L-N) | 1 x 0 ... 150 A (Group A II B) |
| dc (L-N) | 2x 0 ... ± 25 A / 1 x 0 ... ± 50 A |
| Power | 6-phase ac (L-N) | 6 x 70 VA at 7.5 A |
| 3-phase ac (L-N) | 3 x 140 VA at 15 A (Group A II B) |
| 1-phase ac (3L-N) | 1 x 420 VA at 22.5 A, 1 x 420 VA at 45 A (Group A II B) |
| 1-phase ac (L-N) | 1 x 280 VA at 7.5 A |
| dc (L-N) | 2 x 140 W at ±10.5 A, 1 x 280 W at ± 21 A (Group A II B) |
| Accuracy | error < 0.03 % typ. (< 0.1 % guar.) |
| Distortion (THD+N)2 | < 0.1 % typ. (< 0.3 % guar.) |
| Bandwidth (-3dB | > 8 kHz |
| Phase lag at 50/60 Hz | 1.07°/1.28° |
| Input voltage | 0 ... 5 V |
| Amplification | 5 A / V |
| Max. compliance voltage (L-N)/(L-L) | 15 Vpk / 60 Vpk |
| Amplifiers, general3 |
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| Input impedance | > 40 kΩ |
| Galvanic isolation Input/Output | 1.5 kVdc |
| Galvanic isolation amplifier groups | 1.5 kVdc |
| Galvanic isolation amplifier groups | 4mm banana sockets/amplifier combination socket |
| Amplifiers, if controlled by a CMC |
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| Frequency | range sine signals | 10 ... 1000 Hz |
| range transient signals | dc ... 3.1 kHz |
| accuracy/-drift | ±0.5 ppm / ±1 |
| resolution | 5 µHz |
| Phase | angle range | - 360° ... +360° |
| resolution | 0.001° |
| error at 50/60 Hz | < 0.02° typ. (< 0.1° guar.) |
| Output current resolution | 1 mA |
| Power supply |
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| Nominal input voltage | 110 ... 240 Vac, 1-phase |
| Permissible input voltage 9 | 99 ... 264 Vac |
| Nominal frequency | 50/60 Hz |
| Permissible frequency range | 45 ... 65 Hz |
| Power consumption | < 1000 VA |
| Connection | Standard ac socket (IEC 60320) |
| Environmental conditions |
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| Operation temperature | 0 ... +50°C (+32 ... +122°F) |
| Storage temperature | -25 ... +70°C (-13 ... +158°F) |
| Humidity range | Relative humidity 5 ... 95 %, non-condensing |
| Vibration | IEC 68-2-6 (20 m/s2 at 10 ... 150 Hz) |
| Shock | IEC 68-2-27 (15g/11ms half-sine) |
| EMC | CE conform (89/336/EEC) |
| Emission | EN 50081-2, EN 61000-3-2/3, FCC Subpart B of Part 15 Class A |
| Immunity | EN 50082-2, IEC 801-2/3/4 |
| Safety | EN 61010-1, EN 60950+A1, UL 3111-1, CAN/CSA-C22.2 No 1010.1 |
| Miscellaneous |
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| Weight | 15.4 kg (34.0 lb.) |
| Dimensions (W x H x D, without handle) | 450 x 145 x 390 mm (17.7 x 5.7 x 15.4“) |
| Certifications | TÜV-GS, UL, CUL |
1 For higher current/power requirements: CMA units can be switched in parallel.
2 THD+N: Values at 50/60 Hz with 20 kHz bandwidth.
3 Self diagnostics of the hardware upon each start up. All current and voltage outputs are fully overload and short-circuit proof and protected against external high-voltage transient signals and overtemperature.
| Article | Description | Order NO. |
| CMA 156 | Current Amplifier (6 x 25 A) | VEHV1010 |
| CMA 156 | Current Amplifier (3 X250 V, 6 x 25 A) | VEHV1030 |
