Introduction

    When the power system is transmitting power, many unpredictable emergencies will always occur, and the time of occurrence is always elusive. At this time, it is necessary to rely on equipment such as recorders to record all conditions and then transmit them back to the control center. To issue an alarm; this level of equipment usually requires the establishment of a system of a certain scale, which often costs millions. In addition, system maintenance requires regular and quantitative personnel dispatch, and the cost is difficult to estimate.

Multifunctional electricity meter with built-in flash memory

  Among the Janitza multifunctional electric meter series, 4 models are equipped with 128~256MB storage memory, which can record "events" and "transients". The electric meters with recorders are as follows :
● UMG 511 - Configured with 256MB RAM, the panel can display events and transient states.
● UMG 508 - Configured with 256MB RAM, the panel can display events and transient states.
● UMG 605 - configured with 128MB RAM
● UMG 604 - configured with 128MB RAM

Event record, can record 4 types of events

1. Overvoltage (Swell, U MAX)
2. Low voltage (Sag, U MIN)
3. No voltage (Outage, U NULL)
4. Overcurrent (Inrush, I MAX)

Transient recording, the minimum recording time can reach 50μs, and 3 states can be recorded

A. absolute(Peak U、Peak I)
B. delta(Tms U)
C. envelop
    How many events and transients can be recorded in the meter depends on the memory allocation. The larger the memory, the more events/transients can be recorded. This can also prevent the meter from being overwritten due to too much data. It is recommended to install The electricity meter can be equipped with a dedicated system host to provide a database to store data, and historical data can be queried based on time.  

Meter display event/transient record

The panel displays the latest 16 records, and the remaining records are stored in the flash memory of the meter. After downloading to the database using exclusive software, graphics and data can be viewed.

 

Display event/transient captured trend graphs/waveform graphs directly on the panel.

Power monitoring software displays event/transient trend graphs and waveform graphs

    The power monitoring software downloads data from the electricity meter through RS485/Ethernet, sets up various databases such as JanDB / MySQL / MS-SQL, displays historical data and trend charts, and can export CSV files.
The database stores historical values that can be displayed on the software, listing all events as follows :



 
 
  

Conclusion

    Multifunctional electricity meters have long escaped the dilemma of traditional electricity meters that can only measure but not record. Multifunctional electricity meters with memory can customize user records, events, transients, and can even calculate, send emails, and internal content through program planning. Search web servers, import and export customized rules, etc., and then use dedicated software to quickly set up a system and build a database that can be accessed on a local network or wide area network. A power monitoring system can be installed.