ND20 network parameter meter
  • ND20 network parameter meter

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Manufacturer: LUMEL

ND20 network parameter meter

  • Measurement of power network parameters in 2,3 or 4- wire balanced and unbalanced systems.
  • High accuracy class.
  • Indications considering values of programmed ratios.
  • Harmonics of voltages and currents (selectively).
  • THD factors for currents and voltages.
  • Profile of 15, 30, 60-minutes’ power (9000 measurements).
  • Watt-hour meter for the selected harmonic.
  • Backlit LCD 3.5” screen.
  • Protection grade from the frontal side: IP65.
  • Digital transmission to the master system through the RS-485 interface (MODBUS).
  • Configurable analog, alarm and pulse outputs (energy).
  • Configuration of displayed pages.
 
Example of Application

ND20 meter of network parameters application

Measured Quantities and Measuring Ranges

Measured Quantities and Measuring Ranges
Measured value Indication range Measuring range L1 L2 L3 ∑ Basic error
Current In 1 A
5 A		 0,00...1,5 kA
0,00 ... 60 kA		 0,005...1,200 A~ 0,025...6,000 A~ ♦ ♦ ♦   ±0,2 % zak.
Voltage L-N 57,7 V
230 V		 0,0 ... 230,8 kV
0,0 ... 1,012 MV		 0,6 ... 64,0 V~
2,3 ... 253,3 V~		 ♦ ♦ ♦   ±0,2% w.m.
Voltage L-L 100 V
400 V		 0,0 ... 440 kV
0,0 ... 1,752 MV		 85...110 V~
340 ... 440 V~		 ♦ ♦ ♦   ±0,5% w.m.
Frequency 47,0 .. 63,0 Hz 47,0...63,0 Hz ♦ ♦ ♦   ±0,2% w.m.
Active power -9999 MW .. 0,00 W .. 9999 MW -1,65 kW...1,4 W...1,65 kW ♦ ♦ ♦ ♦ ±0,5% w.m.
Reactive power -9999 Mvar .. 0,00 var ... 9999 Mvar -1,65 kW...1,4 W...1,65 kW ♦ ♦ ♦ ♦ ±0,5% zak.
Apparent power 0,00 VA .. 9999 MVA 1,4 VA ... 1,65 kVA ♦ ♦ ♦ ♦ ±0,5% zak.
Power factor PF -1 .. 0.. 1 -1 .. 0.. 1 ♦ ♦ ♦ ♦ ±1% zak.
Tangent φ -1,2...0...1,2 -1,2...0...1,2 ♦ ♦ ♦ ♦ ±1% zak.
Cosinus φ -1...1 -1...1 ♦ ♦ ♦ ♦ ±1% zak.
φ -180...180 -180...180 ♦ ♦ ♦   ±0,5% zak.
Imported active energy 0 .. 99 999 999,9 kWh         ♦ ±0,5% zak.
Exported active energy 0 .. 99 999 999,9 kWh         ♦ ±0,5% zak.
Reactive inductive energy 0 .. 99 999 999,9 kvarh         ♦ ±0,5% zak.
Reactive capacitive energy 0 .. 99 999 999,9 kvarh         ♦ ±0,5% zak.
THD 0 .. 100% 0 .. 100% ♦ ♦ ♦   ±5% zak.

Outputs
Kind of output Properties
Analog output • 1 programmable current output 0/4...20 mA
Relay output • programmable relay output, normally open voltageless contacts, load capacity 250 V~/0.5 A~
Pulse output of active or reactive energy • 1 OC type, passive

Digital Interface
Interface type Transmission protocol Mode Baud rate
RS-485 MODBUS RTU 8N2, 8E1, 8O1, 8N1 4,8; 9,6; 19,2; 38,4  kbit/s
External Features
Readout field LCD 3.5” screen, specialized, monochromatic with backlit  
Weight < 0,3 kg  
Overall dimensions 96 X 96 X 77 mm panel cut-out: 92+06 X 92+06 mm
Protection grade (acc. to EN 60529)) from frontal side: IP65 from terminal side: IP20
Rated Operating Conditions
Supply voltage 85...253 V a.c. lub d.c. (40...400 Hz),
20...40 V a.c. lub d.c. (40...400 Hz)		  
Temperature ambient: -25...23...55°C storage:: -30...70°C
Relative humidity 25...95% inadmissible condensation
Operating position any  
External magnetic field 40...400 A/m  
Short duration overload (1 s voltage input: 2Un (max. 1000 V) current input: 10 In
Power consumption - in the supply circuit ≤6 VA
- in the voltage and current circuits ≤ 0,05 VA
Safety and Compatibility Requirements
Electromagnetic compatibility noise immunity acc. to EN 61000-6-2
noise emissions acc. to EN 61000-6-4
Safety requirements   acc. to EN 61010-1

ELECTRIC CONNECTIONS

ND20 meter of network parameters


Connections:

  • direct, semi-indirect and indirect one-phase measurement,
  • direct measurement in a 3-wire network,
  • semi-indirect measurement in a 3-wire network,
  • indirect measurement with the use of 3 current transfor- mers and 2 or 3 voltage transformers in a 3-wire network,
  • direct measurement in a 4-wire network,
  • semi-indirect measurement in a 4-wire network,
  • indirect measurement with the use of 3 current transformers
    and 2 or 3 voltage transformers in a 4-wire network
Ordering
ND20 meter of network parameters 
* - after agreeing with the manufacturer

Example of order:
The code ND20 - 2 2 1 1 00 E 0 means:
ND20 - meter of network parameters of ND20 type
2- current input: 5A (X/5)
2- input voltage (phase/phase-to-phase) Un =
3 x 230 V/ 400 V
1- with programmable analog output
1- supply voltage: 85...253 V a.c./ d.c.
00- standard version
E- all descriptions and user's manual in English
0- without extra quality requirements

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  • Measurement of power network parameters in 2,3 or 4- wire balanced and unbalanced systems.
  • High accuracy class.
  • Indications considering values of programmed ratios.
  • Harmonics of voltages and currents (selectively).
  • THD factors for currents and voltages.
  • Profile of 15, 30, 60-minutes’ power (9000 measurements).
  • Watt-hour meter for the selected harmonic.
  • Backlit LCD 3.5” screen.
  • Protection grade from the frontal side: IP65.
  • Digital transmission to the master system through the RS-485 interface (MODBUS).
  • Configurable analog, alarm and pulse outputs (energy).
  • Configuration of displayed pages.
 
Example of Application

ND20 meter of network parameters application

Measured Quantities and Measuring Ranges

Measured Quantities and Measuring Ranges
Measured value Indication range Measuring range L1 L2 L3 ∑ Basic error
Current In 1 A
5 A		 0,00...1,5 kA
0,00 ... 60 kA		 0,005...1,200 A~ 0,025...6,000 A~ ♦ ♦ ♦   ±0,2 % zak.
Voltage L-N 57,7 V
230 V		 0,0 ... 230,8 kV
0,0 ... 1,012 MV		 0,6 ... 64,0 V~
2,3 ... 253,3 V~		 ♦ ♦ ♦   ±0,2% w.m.
Voltage L-L 100 V
400 V		 0,0 ... 440 kV
0,0 ... 1,752 MV		 85...110 V~
340 ... 440 V~		 ♦ ♦ ♦   ±0,5% w.m.
Frequency 47,0 .. 63,0 Hz 47,0...63,0 Hz ♦ ♦ ♦   ±0,2% w.m.
Active power -9999 MW .. 0,00 W .. 9999 MW -1,65 kW...1,4 W...1,65 kW ♦ ♦ ♦ ♦ ±0,5% w.m.
Reactive power -9999 Mvar .. 0,00 var ... 9999 Mvar -1,65 kW...1,4 W...1,65 kW ♦ ♦ ♦ ♦ ±0,5% zak.
Apparent power 0,00 VA .. 9999 MVA 1,4 VA ... 1,65 kVA ♦ ♦ ♦ ♦ ±0,5% zak.
Power factor PF -1 .. 0.. 1 -1 .. 0.. 1 ♦ ♦ ♦ ♦ ±1% zak.
Tangent φ -1,2...0...1,2 -1,2...0...1,2 ♦ ♦ ♦ ♦ ±1% zak.
Cosinus φ -1...1 -1...1 ♦ ♦ ♦ ♦ ±1% zak.
φ -180...180 -180...180 ♦ ♦ ♦   ±0,5% zak.
Imported active energy 0 .. 99 999 999,9 kWh         ♦ ±0,5% zak.
Exported active energy 0 .. 99 999 999,9 kWh         ♦ ±0,5% zak.
Reactive inductive energy 0 .. 99 999 999,9 kvarh         ♦ ±0,5% zak.
Reactive capacitive energy 0 .. 99 999 999,9 kvarh         ♦ ±0,5% zak.
THD 0 .. 100% 0 .. 100% ♦ ♦ ♦   ±5% zak.

Outputs
Kind of output Properties
Analog output • 1 programmable current output 0/4...20 mA
Relay output • programmable relay output, normally open voltageless contacts, load capacity 250 V~/0.5 A~
Pulse output of active or reactive energy • 1 OC type, passive

Digital Interface
Interface type Transmission protocol Mode Baud rate
RS-485 MODBUS RTU 8N2, 8E1, 8O1, 8N1 4,8; 9,6; 19,2; 38,4  kbit/s
External Features
Readout field LCD 3.5” screen, specialized, monochromatic with backlit  
Weight < 0,3 kg  
Overall dimensions 96 X 96 X 77 mm panel cut-out: 92+06 X 92+06 mm
Protection grade (acc. to EN 60529)) from frontal side: IP65 from terminal side: IP20
Rated Operating Conditions
Supply voltage 85...253 V a.c. lub d.c. (40...400 Hz),
20...40 V a.c. lub d.c. (40...400 Hz)		  
Temperature ambient: -25...23...55°C storage:: -30...70°C
Relative humidity 25...95% inadmissible condensation
Operating position any  
External magnetic field 40...400 A/m  
Short duration overload (1 s voltage input: 2Un (max. 1000 V) current input: 10 In
Power consumption - in the supply circuit ≤6 VA
- in the voltage and current circuits ≤ 0,05 VA
Safety and Compatibility Requirements
Electromagnetic compatibility noise immunity acc. to EN 61000-6-2
noise emissions acc. to EN 61000-6-4
Safety requirements   acc. to EN 61010-1

ELECTRIC CONNECTIONS

ND20 meter of network parameters


Connections:

  • direct, semi-indirect and indirect one-phase measurement,
  • direct measurement in a 3-wire network,
  • semi-indirect measurement in a 3-wire network,
  • indirect measurement with the use of 3 current transfor- mers and 2 or 3 voltage transformers in a 3-wire network,
  • direct measurement in a 4-wire network,
  • semi-indirect measurement in a 4-wire network,
  • indirect measurement with the use of 3 current transformers
    and 2 or 3 voltage transformers in a 4-wire network
Ordering
ND20 meter of network parameters 
* - after agreeing with the manufacturer

Example of order:
The code ND20 - 2 2 1 1 00 E 0 means:
ND20 - meter of network parameters of ND20 type
2- current input: 5A (X/5)
2- input voltage (phase/phase-to-phase) Un =
3 x 230 V/ 400 V
1- with programmable analog output
1- supply voltage: 85...253 V a.c./ d.c.
00- standard version
E- all descriptions and user's manual in English
0- without extra quality requirements

Less
Read more
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