Device for control of energy quality parameters (UK2)
The UK2 device is designed for measuring and recording energy quality parameters as per GOST 13109-97, voltage and current characteristics, as well as for detecting places where energy quality was caused. The device is used at power supply objects for collecting, processing and storing data about measured parameters.
Functionality
– Direct connection of voltage measuring inputs to single-phase and three-phase 0.4 kV networks, connection to networks with larger voltages through measuring transformers;
– Connection of current measuring inputs with breaking of circuits with a rated current of 1 A or 5 A, and without circuit break by using a current clamp;
– Measurement of various energy quality parameters in full compliance with GOST 13109-97;
– Selection of the connection scheme, the parameters of the scheme taken into account in computations (primary and secondary voltages and currents of measuring transformers, power flow schemes);
– Calculation and storing of values of quality parameters instead of results of statistical treatment, which makes it possible to analyze the state of the controlled power network in detail for the whole period of measurements;
– Stand-alone accumulation of data during more than two months; the accumulated data (measurement results, including measurements at different power supply objects) are stored in the device for an unlimited period of time;
– Statistical treatment of accumulated data and comparison of the results with prescribed energy quality standards;
– User-friendly interface (with a large liquid-crystal display and a keyboard) allowing to control the device with the help of a comprehensive menu system and to view measurement results both in textual and in graphical form;
– Interfaces for communication with PCs or for operation as part of an automated system;
– On-line viewing of accumulated data and current parameters (energy quality parameters existing currently in the power network) and transmission of data to a PC as they become available.
The stationary version of the device, UK2-S, is designed for installation at transformer and distribution substations of enterprises, in processing lines and at various power supply objects for continuous energy quality monitoring. The UK2-S has clamp-type connectors that can be sealed for connection to a controlled network. The RS-485 interface working under the Modbus RTU protocol allows easy integration of the device into various automated systems.
The portable version, UK2-P, is intended to be used by electric power inspection services, industrial and school laboratories. To ensure easy and quick connection to a network, the device has standard sockets for pin connectors and is supplied together with a cable set and a current clamp for current measurements without circuit break. The device has a USB port for connecting a printer for printout of energy quality protocols or a USB-Flash for recording of accumulated data.
Basic characteristics
|
Parameter
|
Measurement range
|
Maximum permissible basic measurement error
|
|
Frequency deviation
|
–5 to +5 Hz
|
Δ = ± 0.01 Hz
|
|
Alternating phase voltage effective value
|
10 to 315 V
|
d = ± 0.2 %
|
|
Alternating line voltage effective value
|
10 to 545 V
|
d = ± 0.2 %
|
|
Steady-state voltage deviation
|
–50 to +50 %
|
Δ = ± 0.2 %
|
|
Sinusoid voltage curve distortion factor, KU
|
0.1 to 30 %
|
Δ = ± 0.05 % (for KU < 1 %)
d = ± 5 % (for 1 % ≤ KU < 30 %)
|
|
N-th harmonic voltage factor, KU(n), n = 2 to 40
|
0.1 to 30 %
|
Δ = ± 0.05 % (for KU(n)<1 %)
d = ± 5 % (for 1 % ≤ KU(n) < 30 %)
|
|
Negative phase-sequence voltage unbalance factor
|
0.1 to 30 %
|
Δ = ± 0.2 %
|
|
Zero phase-sequence voltage unbalance factor
|
0.1 to 30 %
|
Δ = ± 0.2 %
|
|
Voltage variation range
|
2 to 10 %
|
d = ± 8 %
|
|
Short-term flicker dose
|
0.1 to 3
|
d = ± 5 %
|
|
Long-term flicker dose
|
0.1 to 3
|
d = ± 5 %
|
|
Voltage depression:
depth
duration
|
up to 100 %
0.01 to 60 sec
|
Δ = ± 1 %
Δ = ± 0.01 sec
|
|
Temporary overvoltage:
factor
duration
|
1.1 to 2
0.01 to 60 sec
|
d = ± 10 %
Δ = ± 0.01 sec
|
|
Impulse voltage:
value
duration
|
0.1 to 5 kV
0.5 to 65 msec
|
d = ± 10 %
|
|
Alternating current effective value
|
0.1 to 7.5 A
|
d = ± 0.2 %
|
|
Sinusoid current curve distortion factor, KI
|
0.1 to 30 %
|
Δ = ± 0.15 % (for KI < 1 %)
d = ± 5 % (for 1 % ≤ KI < 30 %)
|
|
N-th harmonic current factor, KI(n), n = 2 to 40
|
0.1 to 30 %
|
Δ = ± 0.15 % (for KI(n) < 1 %)
d = ± 5 % (for 1 % ≤ KI(n) < 30 %)
|
|
Negative phase-sequence current unbalance factor
|
0.1 to 30 %
|
Δ = ± 0.2 %
|
|
Zero phase-sequence current unbalance factor
|
0.1 to 30 %
|
Δ = ± 0.2 %
|
|
Phase angle between voltage and current of the n-th harmonic component
|
–180 to +180°
|
Δ = ± 3°
|
|
Phase angle between negative phase-sequence voltage and current components
|
–180 to +180°
|
Δ = ± 3°
|
|
Active power
|
–
|
d = ± 0.5 %
|
|
Reactive power
|
–
|
d = ± 0.5 %
|
|
Total power
|
–
|
d = ± 0.5 %
|
|
Power factor
|
–1 to 1
|
angle measurement error Δ = ± 1°
|
|
N-th harmonic component active power
|
0.2 to 180 W
|
d = ± 5 %
|
|
Negative phase-sequence active power
|
0.5 to 350 W
|
d = ± 5 %
|
|
Active energy
|
–
|
Class 0.2S acc. to STB GOST R 52323-2007
|
|
Reactive energy
|
–
|
d = ± 0.5 %
(for 0.05 < I < 7.5 A and sinj = 1)
d = ± 0.7 %
(for 0.05 < I < 7.5 A and ‑0.5 < sinj < 0.5)
d = ± 0.7 %
(for 0.01 < I < 0.05 A and sinj =1)
d = ± 1.5 %
(for 0.01 < I < 0.05 A and ‑0.5 < sinj < 0.5)
|
Application software
The application software delivered along with the device is designed for detailed analysis of energy quality parameters and remote control of one device or several devices integrated into one system.
Basic features
- Remote control of the device: start and stop of measurements, time synchronization;
- Maintenance of the archive of measurements: reception of accumulated data (both in uninterrupted and suspended modes), deletion of unnecessary portions of measurements, fusion of two measurements, etc.;
- Presentation of measurement results in the form of diagrams and tables;
- Creation of sets of diagrams (viewing charts);
- Combined view window (several diagrams in one grid);
- Accurate measurements with the help of markers in diagrams;
- Presentation of energy quality parameters both in units as per GOST 13109 (deviations, percentage, etc.) and in absolute physical units of measurement (V, Hz, etc.) and in absolute deviations;
- Statistical calculations, construction of bar charts;
- Calculation of daily energy quality protocols (reports);
- Printout of diagrams, tables, protocols;
- Export of diagrams, tables and protocols into standard files in other applications.
The UK2 device is due to enter production in the end of 2010.
Technical support:
Tel.: (+375 17) 267 17 61
E-mail: s1@niisa.iptel.by
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