For testing arc flash protection systems, the Omicron ARC256 Arc Flash Initiator simulates an arc flash by means of a xenon flash tube. This CMC accessory is positioned close to the arc flash sensor during testing. It is connected to the external interface socket of the CMC test set, which provides both the supply voltage as well as the trigger signal. The protection system is then automatically tested using the State Sequencer module of the Test Universe software. This module controls the trigger signal of the flash tube and measures the time to operation.

The Omicron CMA156 amplifier unit can be used in combination with any CMC test set or in conjunction with digital real time power system network simulators. The outputs are galvanically separated from the inputs as well as from ground and are used independently or in addition to those of the CMC test sets. The use of the Omicron CMA156 is recommended for tests requiring higher currents/power in the current path and/or more than 3/6 current channels (e.g. for testing 3-winding transformer differential protection).

Brief Specs:

Omicron’s CMC256 relay test sets generate test signals digitally, resulting in highly accurate testing signals even at small amplitudes. The electronic design of the internal amplifiers and the use of switch mode power supply units ensure a minimum of weight and volume is achieved. Independent channels with low-level signals are available at the back of the test set, which can be used to control external amplifiers for applications requiring more signal channels or higher currents, voltages or power. The low-level signals can also be used for test objects which have a low-level input facility.

All generators are continuously and independently adjustable in amplitude, phase and frequency and no switching of ranges is necessary. All current and voltage outputs are fully overloaded, short-circuit proof and are protected against external high-voltage transient signals and over-temperature. Every device is developed according to international IEC standards and verified by independent certification bodies including UL and TÜV. For testing that requires higher outputs a CMA 156 – 6 Phase Current Amplifier can be used along with the CMC256.

Brief Specs:

• 4 x 300 V outputs
• 6 x 12.5 A / 3 x 25 A outputs
• 6 x low level outputs (rear side)
• 2 x counter inputs (rear side)
• dc supply (0 … 264 V)
• 4 x binary outputs
• dc measuring inputs
• 10 x binary inputs /
• Analog measurement inputs

As a universal testing and commissioning solution, the Omicron CMC356 is the ideal option for many systems and scenarios. By generating analog test signals and combining them with additional error correction algorithms, accurate testing signals are created, even at small amplitudes.

Six current and four voltage output channels are continuously and independently adjustable in amplitude, phase and frequency. All outputs are overload and short-circuit proof and are protected against external high-voltage transient signals and over-temperature. The integrated network interface supports comprehensive testing in the IEC 61850 environments using optional GOOSE simulation and subscription and Sampled Values simulation functionality. Up to 12 independent channels with low-level signals are available at the back of the test set, which can be used to test relays which have a low-level input facility or to control external amplifier units.

Brief Specs:

• Very powerful current sources for testing 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
• Continuous synchronized outputs with CMIRIG-B (e.g. for PMU or MU testing)
• Primary injection capabilities for commissioning tasks
• Test Universe software with unrivalled manual and automated testing functionality

The Omicron CMGPS is a GPS-based synchronization unit which is used with either a CMC256 or CMC356 test set. When performing end-to-end tests of line protection schemes, it enables the operator to start several test sets simultaneously. The CMGPS is typically ready for operation just 5 minutes after start up and the synchronizing pulse can be configured according to the requirements of the application. The software is both integrated in the testing modules (like the State Sequencer) and also provided as a standalone application. It allows for the setting of first output pulse, pulse rate, and polarity.

Brief Specs:

Pulse Out 1

• Type: CMOS-output
• Accuracy: error < ±1 μs

Pulse Out 2

• Type: Open-collector output
• Accuracy: error < ±5 μs
• Galvanic isolation: Optocoupler, isolation according to IEC 1010, Test voltage 3 kVrms

GPS data

• Time till ready for operation: typ. 5 min
• Pulse polarity: positive or negative
• Pulse rate: 1 … 65535 s (in steps of 1 s)
• Pulse width: 200 ms
• Synchronization of test sets: error < 100 μs / < 5 μs

 Description:

The CMLIB 7Sx8 is an interface adapter for connecting SIEMENS protection relays fitted with sensor inputs (e.g. SIPROTEC 7SJ81) to the low level outputs of CMC test sets. CMLIB 7Sx8 converts the low-level output signals of the CMC into differential (balanced) signals. In addition, the adapter also provides the simulated voltage system. In combination with CMC 356, CMC 353, CMC 256plus, CMC 256-6, and CMC 850 test sets.

By generating signals and using selective measurements different from the power system frequency, the combination of an Omicron CPC 100 and an Omicron CP CU1 is able to obtain very accurate results. The CP CU1 coupling unit is used to safely connect the inputs and outputs of the CPC 100 to a transmission line. The grounding box CP GB1 is used to make the connection between the CP CU1 and the overhead line and can be located at a safe distance from the operator.

To measure line impedance and k-Factor or the mutual coupling factor, the CPC 100 and CP CU1 operate at a nonsystem frequency allowing the user to measure all fault loop configurations (phase to ground, phase to phase and three phase to ground). This provides accurate measurement of impedance magnitude and phase angle for lines with lengths of up to 300 km.

Conventional ground impedance test methods using power system frequencies need enormous power and complicated methods to overcome the problems of interference. By varying the frequency and using narrowband digital filtering with the CPC 100 and CP CU1 reduces the required power to a minimum. The inductive coupling impedance between a power system and adjacent cables can also be measured using the CPC 100 and CP CU1 test system.

Brief Specs: