3-Phase Network Meter, ND1

Kind of input

Measuring range

Parameters

Basic error

Voltage input

57.7/100V, 230/400 V or 400/690 V

0.05...1.2 Un

± 0.2%

Current input

1A or 5A

0.005...1.2 In

± 0.2%

Logic input

12 inputs: 0/5...24 Vdc

switch frequency up to 50 Hz

Outputs

Output type

Properties

Analog output

4 programmable current outputs of 0/4...20mA,
load resistance < 500 Ω

Relay output

• 6 programmable electromagnetic relays
• voltageless NOC contacts,
load capacity: 250 Vac/1A ac

Output to supply object transducers

• 2 ouptuts of 24 Vdc/30mA

Digital Interface

Interface type

Properties

RS-485

2 interfaces: MODBUS slave and master,
baud rate: 300...256000 bit/s,
transmission mode ASCII/RTU

USB

Device C.1.1, USBB-G socket

Ethernet

10 Base-T, RJ45 socket, Modbus Slave TCP/IP

Rated Operating Conditions

Supply voltage

85...230...253 V a.c./d.c., 40 .. 400 Hz or d.c.

power consumption ≤ 30VA

Ambient temperature

Work: 0...23...50°C

Storage: -20...60°C

Relative humidity

< 70%

Condensation inadmissable

Reaction against

supply decays

Data and device state preservation

supply recovery

Continuation of device work

Short term load (5s)

2 Un (max. 1000 V)

10 In

Casing protection grade

From frontal side: IP 65

From terminal side: IP20

Safety requirements

Installation catagory: II

EN 61010-1

Pollution grade: 2

Maximum phase to
earth operating voltage

From the measuring system,
relays and supply: 500 V

For RS485 and USB
interfaces: 50V

Measuring ranges and admissible basic conversion errors

Measuring quantity

Range

Basic error

Remarks

Voltage U

57.73/100.0 V (Ku=1)
230.0/400.0 V (Ku=1)
400.0/690.0 V (Ku=1)
400.0 kV (Ku≠1)

± 0.2 %

Ku = 1...4000

Current I

1.000 a (kI=1)
5.000 a (kI=1)
100.0 kA (Ki≠1)

± 0.2 %

Ki = 1...20000

Active power P
Mean active power Pav

0.0... (-) 6000,0 W
999.00 MW (Ku≠1, Ki≠1)

± 0.5 %

Apparent power S

0.0...6000.0 VA
999.00 MVA (Ku≠1, Ki≠1)

± 0.5 %

Reactive power Q

0.0... (-) 6000.0 Var
999.00 Mvar (Ku≠1, Ki≠1)

± 0.5 %

Active power factor PF

-1.000...0...1.000

± 0.5 %

PF = Power
Factor = P/S

Coefficient tgφ

-10.00...0...10.00

± 1 %

Ratio of active
power to reactive

φ angle between U and I

-180°...180°

± 0.5 %

Evaluated from
the power triangle

Frenquency f

45.00...66.00 Hz

± 0.1 %

THD U, THD I
Harmonics U, I (up to 51st)

0.200.0%
0.100.0%

± 2 %

Error in the range
10...120 % U, I

PST, PLT

0...20

± 0.5 %

in range of 0.05...35 Hz

Active energy EnP

0...(-) 99 999 999.9 kWh

± 0.5 %

Reactive energy ENQ

0...(-) 99 999 999.9 kvarh

± 0.5 %

Where:

Ku

voltage transformer ratio

Ki

current transformer ratio

THD U

total coefficient of voltage harmonic distortion

THD I

total coefficient of current harmonic distortion

ND1 -

analyser of 3-phase power network parameters of ND1 type

2 -

current input: 5 A

1 -

voltage input: 57.7/100 V

00 -

standard version

E -

English language

0 -

without extra quality requirements