Electric energy 10.06.2020 20:59 10.06.2020 20:59

The device is designed for remote monitoring of energy consumption. It is designed for installation on a DIN rail. It is suitable for a wide range of applications in energy and so-called smart grids, in the automation of buildings and individual production processes, for remote monitoring of infrastructure and also for automatic load control. For connection to the control system, it is available in a version with a CIB bus (C-EM-0300M) or an RFox2 wireless connection (R-EM-0300M-A). The device measures three voltages and three currents.

  • four-quadrant power measurement and electricity meter according to PPDS requirements
  • extended, more accurate and continuous measurement of harmonic phasors (amplitudes and angles)

 

Connection and measurement

  • AC power supply from measured voltages 115 ÷ 280 V
  • three voltage inputs (L1, L2, L3) for direct or indirect voltage measurement in star connection, single-phase and Aaronic. Measurement category 300 V CAT III.
  • 6.4 kHz sampling, continuous measurement
  • calculation of 50 components of harmonic voltages and currents
  • evaluation of all commonly measured single and three-phase quantities such as powers (active, reactive, apparent, deformation and fundamental active and reactive), power factors, harmonics and THD voltages and currents
  • the device is realized for connection of current transformers with 333 mV output, information about selected types is here.

 

Technical parameters
Auxiliary supply voltage
nominal supply voltage range 115 – 280 VAC

 

115 – 300 VDC

range e.g. voltage (AC), f: 40 ÷ 100 Hz 100 – 310 VAC
supply voltage range (DC) 100 – 330 VDC
power consumption 7 VA / 2 W
overvoltage category III (300 V)
degree of pollution 2
maximum altitude 2000 m
connection galvanically isolated, arbitrary polarity

 

 

Other parameters
operating temperature -25 ÷ 70 °C
storage temperature -40 ÷ 80 °C
operating and storage humidity < 95 % - without condensation
communication interface CIB or RFox2 by variant
sampling frequency 50 Hz (60 Hz) 6,4 kHz (5,76 kHz)
RTC accuracy ± 2 seconds per day
RTC backup battery capacity > 5 years (without connected supply voltage)
IP degree of protection
  front panel
  whole device

IP 40
IP 20
protection class II
dimensions 54 x 90 x 61 mm
weight 0,13 kg

 

 

Measured quantities

Measured quantities – voltage

Frequency

fNOM – nominal 50 / 60 Hz
measuring range 40 ÷ 70 Hz
measurement uncertainty ± 10 mHz

Voltage

UNOM (UDIN) – specified voltage 180 ÷ 250 VAC
swing factor at U NOM - nominal 2
measuring range (phase, UL-N) 8 ÷ 355 VAC
measuring range (associated, UL-L   ) 14 ÷ 615 VAC

measurement uncertainty (tA=23 ±2 ºC)

+/- 0,05 % of value ± +/- 0,1 % of range
temperature drift +/- 0,03 % of value ± +/- 0,01 % of range / 10 ºC
measurement category 300  V CAT III
permanent overload 1355 VAC (UL–N)
peak overload, 1 second 2140 VAC (UL–N)
power consumption (impedance) < 0.05 VA (Ri = 6.12 MΩ))
Voltage asymmetry
measuring range 0 ÷ 10 %
measurement uncertainty ± 0.5

THDU

measuring range 0 ÷ 20 %
measurement uncertainty ± 1

Harmonic to order 50 (40 @ 60 Hz)

reference conditions other harmonics up to 200% class 3 according to IEC 61000-2-4 ed. 2
measuring range 10 ÷ 100 % class 3 according to IEC 61000-2-4 ed. 2
measurement uncertainty twice the class II levels according to IEC 61000-4-7 ed. 2

 

 

Measured quantities - powers, power factor, energy
Active / reactive power, power factor (PF), cos φ (PNOM = UNOM x INOM)
reference conditions “A”:
    ambient temperature(tA)
    U, I
    for active v., PF, cos φ
    for reactive power

23 ± 2 ºC
U =  80 ÷ 120% UNOM,  I = 1 ÷ 120% INOM
PF = 1.00
PF = 0.00
active / reactive uncertainty in. ± 0.5% of value ± 0.01% PNOM
uncertainty PF, cos φ ± 0.01
reference conditions “B”:
  ambient temp. (tA)
    U, I
  for active p., PF, cos φ
  for reactive power

23 ± 2 ºC
U =  80 ÷ 120% UNOM,  I = 2 ÷ 120% INOM
PF >= 0.5
PF <= 0.87
active / reactive uncertainty in. ± 1% of value± 0.01% PNOM
uncertainty PF, cos φ ± 0.01
thermal drift performance ± 0.05 % of value ± 0.02 % PNOM / 10 ºC
Energy
measuring range corresponds to measuring ranges U, I
4 counters corresponding to 4 quadrants for active and reactive energy separately
uncertainty of active energy measurement class 1 according to EN 62053 – 21
nejistota měření jalové energie class 2 according to EN 62053 – 23

 

 

Table 2: IEC 61557-12: Equipment for measuring and monitoring electrical parameters

Device properties according to IEC 61557-12

power quality  
device classification according to chap. 4.3 

 

direct voltage connection

PTN voltage connection


 

SD
SS
temperature class according to chap. 4.5.2.2 K55
humidity + altitude according to chap. 4.5.2.3 < 95 % - without condensation
< 2000 m
active power and active energy performance class 1

 

 

Functional performance classes according to IEC 61557-12

Model „X/333mV“ with PTP „xxx/333mV“, INOM = xxx A, UNOM = 230 V

Mark Function Třída Measuring range Note
P total active power 1 0 ÷ (993.6 * INOM) W  
QA, QV total reactive power 2 0 ÷ (993.6 * INOM) var  
SA, SV total apparent power 1 0 ÷ (993.6 * INOM) VA  
Ea total active energy 1 0 ÷ (993.6 * INOM) Wh  
ErA, ErV total reactive energy 2 0 ÷ (993.6 * INOM) varh  
EapA, EapV total apparent energy 1 0 ÷ (993.6 * INOM) Vah  
f frequency 0.02 40 ÷ 70 Hz  
I phase current 0.5 0.1 ÷ 1.2 * INOM ASTŘ  
IN measured neutral current  
INc calculated neutral current 0.5 0.1 ÷ 1.2 * INOM ASTŘ  
ULN phase voltage 0.05 40 ÷ 280 VSTŘ  
ULL combined voltage 0.05 70 ÷ 480 VSTŘ  
PFA, PFV power facotr 0.5 0 ÷ 1  
Pst, Plt flicker  
Udip short-term voltage drops  
Uswl short-term voltage increases  
Utr transient voltage  
Uint interrupt voltage  
Unba voltage asymmetry (amplitude) 0.5 0 ÷ 10 %  
Unb voltage asymmetry (phase and amplitude) 0.5 0 ÷ 10 %  
Uh voltage harmonics 1 do řádu 25 1)
THDu total harmonic distortion of voltage (% U 1. harm) 1 0 ÷ 20 % 1)
THD-Ru total harmonic distortion of voltage (% Ueff) 1 0 ÷ 20 % 1)
Ih current harmonics 1)
THDi total harm. current distortion (% I 1. harm.) 5 0 ÷ 200% 1)
THD-Ri total harmonic current distortion (% Ieff) 5 0 ÷ 200% 1)

1) according to IEC 61000-4-7

 

 

 

Fig. 1 electricity meter connection C-EM-0300M

 

Fig. 2 electricity meter connection R-EM-0300M-A