Main features of the UMG 20CM

DIFFERENTIAL CURRENT (RCM)

Powerful RCM residual current monitoring detects fault currents at an early stage, before they lead to system failures or even fires. It is already integrated in certain UMG measuring devices. The required RCM measuring current transformers can be retrofitted if required. Continuous RCM monitoring significantly increases system safety and availability. In certain applications such as data centers, residual current monitoring is mandatory due to the requirements for high availability.

HARMONICS

Harmonics are caused by equipment with non-linear characteristics, such as transformers operated in saturation, energy-saving lamps, frequency converters and power electronics. They burden the grid with additional currents and can affect or even destroy equipment. These grid perturbations can be detected and documented using power quality analyzers.

MODBUS INTERFACE

Many UMG measurement devices have an RS485 interface with Modbus RTU protocol, which enables extremely cost-effective networking. It is characterized by a simple topology structure and insensitivity to EMC interference. Communication between the transmitter and receiver is wired via a shielded, twisted pair cable.

ALARM MANAGEMENT

The GridVis® alarm management system monitors all measurement parameters obtained by the UMG measurement devices. It includes escalation management, logbook function and user administration for individual notifications by e-mail, pop-up window on the monitor, etc. In addition to monitoring RMS values, short-term interruptions and transients as well as communication with the measuring devices can also be monitored.

GRIDVIS®

GridVis® is a comprehensive and scalable software for setting up an energy monitoring system and for monitoring power quality. It is used for programming and configuring many UMG measurement devices as well as for reading, processing and analyzing measurement data. Typical applications are energy supply, industrial plants, facility management, etc.

POWER CHANNELS

While power quality analysis and energy management play a major role at the main feed-in, individual currents tend to be recorded in sub-distribution boards. The UMG 20CM energy and residual current meter has 20 current channels for this purpose, i.e. connections for current transformers. This allows operating currents of up to 600 A and residual currents of 10 mA to1000 mA to be recorded.

Areas of application

  • Continuous recording of operating currents
  • Permanent residual current monitoring
  • Messages when the rated current is exceeded
  • Energy metering of complete power distribution systems
  • Cost center entry
  • Energy cost transparency
  • More effective use of the IT infrastructure
  • PDUs in data centers
  • Increase in high availability

RCM AND ENERGY METER IN ONE DEVICE

  • 20 current measuring channels
  • 4 voltage measurement channels
  • Internal RS485 interface (Modbus as slave)
  • 20 LEDs – one LED for each current channel (green = O.K., yellow = warning message; red = nominal current exceeded)
  • Measuring range with load up to 63 A with closed or split-core current transformers (standard measured values: V, A, kW, kVA, kVar, kWh)

THE SYSTEM FOR CLEVER MINDS

  • Compactness of the system
  • Retrofittability in existing systems
  • Modbus RTU directly on board
  • Status display per channel (LEDs)
  • Name per channel stored in the measuring device
  • Wide-range power supply unit (90 – 276 V … AC / DC)
  • Integration into the GridVis® software
  • Various converter variants for individual applications
  • Measurement variants:
    • Three-phase and single-phase energy measurement
    • RCM measurement single-phase and three-phase systems
  • High sampling rate 20,000 Hz
  • Transformer connection check (i.e. cable break is detected)
  • Harmonic analysis up to the 63rd OS via analysis channel
  • Storage of minimum and maximum values with time stamp
  • Standard measured values: V, A, kW, kVA, kVar, kWh (list of variables)
  • Scalability of the system

POWER SUPPLY WITHOUT FAILURES

  • Permanent monitoring and logging of processes in TN-S or TN-C-S systems
  • Simple parameterization and operation of the RCM measurement
  • Automatic reporting when problems occur enables countermeasures to be initiated quickly
  • Comprehensive diagnostics increase the safety and profitability of a company

REPORTING BEFORE FAILURE (PREVENTIVE FAULT CURRENT ANALYSIS)

  • Any faults that occur are detected in good time
  • Monitoring, evaluation and reporting of creeping increases in residual currents (e.g. triggered by insulation faults and excessive operating currents of system components or loads)
  • Reduction of downtimes

SENSORS FOR ENERGY MANAGEMENT

  • Energy data from a large number of consumers can also be recorded and transferred to a database with little effort
  • Automatic readout and storage of the data stored in the measuring devices and their measured values
  • as well as from exceeding parameterized threshold values
  • The GridVis® software can be used to display channel-related measured values from the current monitoring devices
  • The GridVis® software is used to analyze and store the data in central databases
  • The greater the information density, the more precise the determination of potential savings
  • Energy optimization offers a high, economic savings potential (ISO 50001)

YOUR BENEFIT – THE INTELLIGENT SYSTEM SOLUTION

  • Early warning of system faults
  • Avoid costly and dangerous system failures; increase system availability
  • Localization of individual, faulty outlets, less effort for troubleshooting
  • Overloads of the N-conductors and critical residual currents are detected at an early stage, thus achieving greater fire safety
  • By parameterizing the system in its new state and continuous monitoring, all changes to the system status can be identified from the time of commissioning
  • Fulfillment of the “RCM fault current monitoring” safety criterion in data centers
  • Convenient monitoring and parameterization solution using GridVis® software
  • Operating current recording of all relevant consumers as the basis for an energy management system (EnMS)