Development and production of systems for measurement and control
1. Device description
Device is designed for regulation and monitoring of power demand. Connection to pulse outputs of electricity meter
can be realized via optoelectronic unit or directly. Power demand regulation is optimized according to chosen
regulation curve and set regulation or technical maximum. Device has 5 inputs, which can be connected to following
signals:
active consumption, reactive consumption, reactive distribution, tariff or active distribution and
measuring period
. HM2006 is doing full monitoring of power demand. There are 6 relay outputs 3 A / 250 VAC.
Device is equipped by standard communication channel RS485, which allows remote connection to PC (personal
computer). From PC, it is possible to make parametrization and readings of all measured values, which are
continuously being saved to the internal memory of regulator. Another features, offered by software, are on-line
consumption/distribution visualization, history, data and configuration archivation in PC, etc.
Device has output of galvanic isolated power supply of 12 VDC for supplying of optoelectronic unit which separate
regulator from energy meter. Regulator has its own real-time clock, which is backed up for 48 hours and can be
synchronized via measuring period for energy meter. Information are shown on the LCD display and device is also
equipped by four-button keyboard for control of set parameters.
2. Device function
Regulator measures active power waveform on the base of number of pulses from energy meter outputs and
conversion constant [Wh/pulse] which is set. These measurements are being done within the frame of measuring
period, and compared with waveform defined by regulation curve, with set hysteresis included. On the base of
comparison result ,regulator will decide, if it is necessary to disconnect some stage ,or on the contrary, that is
possible to connect some. Defined parameters of particular stages have to be taken into account.
Consumed electric energy, during one measuring period, is saved into data memory and measurement starts again.
It is possible to set different modes for the regulator- after measuring period ends regulator can connect again all
stages, or it will continue in regulation step by step, and according to the situation it will connect progressively
particular stages. If the pulse for the measuring period is not available from the main meter, it is possible to activate
internal generator of pulses in the regulator itself. Afterwards it is necessary to tune real time of regulator clock with
time of switching clock of main energy meter and
keep regular control. There is also possibility to use one regulator
input for tariff pulse, which is at some tariff rates needed for differentiation between technical and regulation
maximum. If there is no possibility to connect tariff, then it is possible to use for its identification internal timer
program, which is possible to be programmed in regulator. At this feature, it can happen that in the case of significant
time difference between main energy meter and regulator (bigger that one period) regulator will not work correctly.
This problem can never happen if the time synchronization is done by pulses. Other parameters monitored by
regulator HM2006 are saved to the memory and it is possible to use them for visualization of load behaviour by PC
software.
3. Working principle of consumption regulation
Regulator has 6 relay outputs (R1 – R6). In programming mode, it is possible to set maximum value of average hour
consumption, in kW. This value is in periodic intervals compared to consumption during 1/4 hour and in case of fast
consumption rise regulator disconnects one of six possible connected circuits. If consumption rising drops down so
much that reserve of power appears, then regulator disconnects one of closed relays (according to its priority) and
move relevant circuit back to be part of network. According to the actual consumption, device is showing during 1/4
hour calculation of average hour consumption value in kW. After quarter hour pulse comes, displayed value is reset
and all relays are disconnected and regulation process will be repeated. During measurement, following information
will be recorded: maximum reached value of quarter maximum, date and time when it happened, for each tariff
individually. Those maximum values are possible to be seen in absolute value displaying mode. All values are
possible to be seen and at the same time also to be reset. Load curve is recorded each quarter of hour into the
device memory for period of 40 days. After exceeding of 40 days period, device memory is started to be re-written by
data from first day (FIFO). After connection to the PC, it is possible to make analyzes of load for last 40 days, read
actual measured values, check device configuration and also to change it.
Regulation principle is shown on the picture bellow:
BMR
BMR
trading
Lipovka 17
Horní lán 17
516 01 Rychnov n. Kn.
779 00 Olomouc
Czech Republic
Czech Republic
3
Tel: +420 774 415 703
Fax: +420 494 533 602
www.bmr-trading.com
