Wattmeter-counter VSET-1

Wattmeter-counter

VSET-1

PURPOSE AND FIELD OF APPLICATION

Standard meter is intended for periodic recalibration of single-phase and three-phase electricity meters measuring active and reactive energy in two directions, single-phase and three-phase wattmeters, varmeters as well as active and reactive energy trandsducers, voltmeters, ammeters and voltage and current transducers. It is possible to use it when adjusting and calibrating the indicated measuring devices.

NORMATIVE AND LEGAL BACKING

IEC 62052-11:2003

FUNCTIONAL CAPABILITIES

The standard meter provides periodic recalibration of single-phase and three-phase devices measuring electrical power and electrical energy of commercial frequency of the accuracy class 0,2 and less accurate for active power and energy and of the accuracy class 0,5 and less accurate for reactive power and energy. Here the standard meter measures: active power and energy of the forward and reverse direction in single-phase and three-phase, three- and four-wire circuits; reactive power and energy of the forward and reverse direction in single-phase and three-phase, three- and four-wire circuits; total power and energy, voltage and current in the indicated circuits; error of calibrated measuring devices when measuring with their help active, reactive and total energy of the forward and reverse direction.

The measured values of voltage, current, power and error are indicated on the built-in liquid-crystal display. On-screen display mode control and setting the mode of operation of the standard meter are carried out with the help of keyboard on the front panel.

The standard meter has 48 pulse inputs to connect the meters and an alternate 12V power source to power pulse inputs.

The standard meter can operate under control of a PC. Data exchange between the standard meter and PC is carried out through serial digital� RS-232 or RS-485 interface. Exchange protocol provides the possibility to integrate the standard meter� and other devices with compatible protocols into a network via RS-485 interface.

The standard meter is constructed as an individual portable device intended for desktop application.

WORKING AND SERVICE CONDITIONS

Ambient air temperature, ��	23�5
Relative humidity, %	80 % at 20 ��;
Atmospheric pressure, kPa	from 84 t� 106,7
Parameters of single-phase power line:
voltage, V	230�23
frequency, Hz	50�2,5
nonsinusoidality ratio, %	not more than 5

TECHNICAL DATA

Quantity	Value
Nominal values of� measured phase voltages (Un), V	57,7; 127; 230
Working range of measured voltages, V	from 0,4�Un t� 1,2�Un
Maximum permissible relative error when measuring voltage, %	�0,05
Nominal values of measured currents (In), A	0,025; 0,05; 0,1; 0,25; 0,5; 1; 2,5; 5; 10; 25; 50; 100
Working range of measured currents
In from 25 m� to 50 �	from 0,4�In t� 1,2�In
In =100 �	from 0,4�In t� 1�In
Extra current range, m�
In=25 m�	from 1 t� 10
Maximum permissible relative error� when measuring current, %
In from 50 m� t� 10 �	�0,05
In=25 m�; In from 25 � t� 100 �	�0,1
In from 1 m� t� 10 m�	�5
Maximum permissible relative error� when measuring active energy at nominal voltage, %
In from 50 m� t� 10 �	�0,05 when cosφ=�1 �0,08 when cosφ=�0,5 (L, C)
In=25 m�; In from 25 � t� 100 �	�0,1 when cosφ=�1 �0,15 when cosφ=�0,5 (L, C)
Maximum permissible relative error when measuring active energy at nominal current 5 �, %
U from 0,8�Un t� 1,15�Un	�0,05 when cosφ=�1 �0,08 when cosφ=�0,5 (L, C)
Maximum permissible relative error when measuring reactive energy at nominal voltage, %
In from 50 m� t� 10 �	�0,1 when sinφ=�1 �0,15 when sinφ=�0,5 (L, C)
In=25 m�; In from 25 � t� 100 �	�0,2 when sinφ=�1 �0,3 when sinφ=�0,5 (L, C)
Maximum permissible relative error when measuring reactive energy at nominal current 5 �, %
U from 0,8�Un t� 1,15�Un	�0,1 when sinφ=�1 �0,15 when sinφ=�0,5 (L, C)
Maximum permissible relative error when measuring total power, %
In from 50 m� t� 10 �	�0,1
In=25 m�; In from 25 � t� 100 �	�0,15
Power consumed by each input voltage circuit, V��	not more than 1
Impedance of each input circuit, Ohm
In from 0,025 t� 0,1 �	not more than 1,2
In from 0,25 t� 1 �	not more than 0,15
In from 2,5 t� 10 �	not more than 0,04
In from 25 t� 100 �	not more than 0,003
Quantity of calibrated meters	up to 48
Class of calibrated meters	0,2 and less
Meter constant depending on the current and voltage range, pulses/kwh	from 40000 t� 640000000
Power consumed by the standard meter, V��	80
Average error-free running time, h	5000
Average service life, years	40000
Mass, kg	13
Measurements, mm	486�160,5�505

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