Power Quality Monitoring Devices

Extensive communication possibilities e.g. RS 485 Modbus, Profibus, Ethernet (TCP/IP), BACnet, http, FTP, SMTP, SNTP, DNS ... allow cost effective and rapid integration in existing communication networks.

Worldwide access to the embedded web server can be gained through a web browser. The GridVis software included in the content of delivery allows extensive analysis just by the click of a button.

Extensive communication options, such as RS485 (Modbus RTU, Profibus), Ethernet TCP / IP, BACnet, HTTP, FTP, SNMP, SMTP, SNTP, or DNS allow a cost effective and rapid integration into existing communication structures.

The measurement is made on 4 separate current inputs, either for three phase systems with additional measurements in N or PE or the measurement of 4 individual single-phase loads. The UMG 508 has per each current input a separate energy counter. The very large data memory of 256 MB permits the logging of all readings for months even without intermediate reading.

Extensive communication possibilities e.g. RS 485 Modbus, Profibus, Ethernet (TCP/IP), BACnet, http, FTP, SMTP, SNTP, DNS .... allow cost effective and rapid integration in existing communication networks. Worldwide access to the embedded web server can be gained through a web browser.

User-specific programs can be created. It is possible to run 7 user programs simultaneously.The GridVis software included in the content of delivery enables simple and complete parameterisation and allows extensive analysis just with the click of a button.

The UMG 604, equipped with a 500 MHz DSP (digital signal processor), is a fast and high performing power analyser. The continuous scanning of eight channels with 20 KHz per channel enables the collection of all relevant electrical parameters (more than 800 values), minimum and maximum values, the basic power quality values such as harmonics (up to the 40th, each phase with direction recognition) and short term interruptions.

Even fast transients (> 50µs) can be safely identified. Using modern communication processes, the collected data is conducted to a central location, stored centrally in a high-performance database and provided for further processing in an open system. Simple integration in an existing building management system control or PLC environment expands the areas of application of the UMG 604.

The UMG 96RM is a very compact and powerful universal measurement device, mainly designed for use in low and medium voltage distribution systems.

In addition to the large quantity of electrical measurement values, this innovative measurement instrument offers a multitude of additional functions such as for example the measurement of harmonics up to the 40th order. The continuous sampling with 21.3 kHz enables a detection of the mea- sured values in high resolution and thus provides an effective energy management tool for fault ana- lysis and for monitoring power quality

Janitza is expanding its measurement device range UMG 96 rapidly and proves once again its innovative strength when dealing with the issue of energy management and energy measurement technology.

Thanks to their new universal measuring device, the UMG 96RM-E, there is an power analyser on the market for the first time which offers 6 current inputs (4 inputs at 1 A or 5 A and 2 analogue inputs 0 to 30 mA), where the two analogue inputs can be used for differential current measurement. Simple detection of the differential current and the current on the CGP (central grounding point) is guaranteed with this. As an alternative, the analogue inputs can be used for temperature measurement, for example.

By continuously monitoring differential currents (residual current monitor, RCM), of an electrical system a digital output can be set if a threshold value is exceeded. The system operator can therefore react promptly before a protective device operates. This is especially important in systems where it is important to guarantee high availability, in data centres for example.

The UMG 96RM-E is designed to measure and calculate electrical parameters such as voltage, current, power, 1 to 40th harmonics of power and voltage, distortion factors (THD) of power and voltage and so on. Records of load profiles for energy management systems (e.g. in accordance with ISO 50001) as well as measurement of power consumption for cost centre analyses are an integral part. The continuous sampling at 21.33 kHz (50 Hz) or 25.6 kHz (60 Hz) provides the measurements at high resolution levels and also offers an effective tool for troubleshooting and for monitoring power quality in the energy management area. Reliable and quick data transfer and an easy integration into the network is achieved thanks to the Ethernet connection as well as communication via Modbus/RS485. The UMG 96RM-E can be programmed in several ways. The options here are the programming and analysis software, GridVis, the device's own home page or the Modbus protocol. Measurement data are available to be called up via various channels. The large 256 MB of memory stores the data reliably over a long period of time.

The power analyser UMG 96RM-E was designed for use in the areas of building installations, main and sub distribution boards (MDB), data centres, machine level as well as electrical bus distribution systems. It proves to be extremely capable in these areas.

The continuous scanning of the 8 channels with 20 kHz per channel allows the recording of all electrical parameters (more than 800 values), minimum - and maximum - values, and the main power quality values such as harmonics (up to the 40th, each phase with the detection of direction). Based on these data loss of production can be avoided, concepts can be developed, such as the electricity cost reduction programs, and measures introduced. And finally the improvements can be monitored and recorded with the UMG 104 as well.

Using modern communication architectures, the acquired data are fed to a central location, in powerful databases, stored centrally and made available for further processing in an open architecture. The easy integration into an existing building control system or PLC environment extends the capabilities of the UMG 104.

In addition to a large quantity of electrical measurement values, the UMG 103 offers a multitude of additional functions such as the measurement of harmonics, the storage of minimum and maximum values, operating hour meter, bi-metallic strip function and password protection. The interface and field bus capabilities (Modbus) enable the communication of measurement data and incorporation into a comprehensive energy management system.

In order to achieve the functional diversity of the universal measurementinstrument, you would need 13 analogue units such asan ampere meter, volt meter, volt meter switch, power meter (kW, kVA, kvar, cosp), an effective and reactive energy meter (kWh/kvarh) and a frequency meter. This means that the planning, installation, wiring and storage costs are significantly reducedin comparison to the use of analogue measuring instruments. Another advantage is the higher precision and better legibility.

The effective values and the minimum and maximum values are recorded every 15 minutes and the programming data is immediately stored in a non-volatile memory (EEPROM). The main characteristic of the measurement instrument is the compact construction (96x96 mm) and the high level of stability.

In order to achieve the functional diversity of the universal measurement instrument, you would need 13 analogue units such as an ampere meter, volt meter, volt meter converter, power measurer (kW, kva, kvar, cosp), an effective and reactive power meter (kWh/kvarh) and a frequency measurer. This means that the planning, installation, wiring and storage costs are significantly reduced in comparison to the use of analogue measuring instruments. Another advantage is the more precise and better legibility.

This allows the safe identification of short-term interruptions with the fault recorder function. For short-term events, the effective values are recorded over 128 periods with 64 pre-trigger periods and with the transient memory over 5 periods with 2 pre-trigger periods. The reaction time of the internal outputs is < 10ms and the external bus outputs < 200ms.