Device for measurement of parameters of power networks (MITs-1)

Intended use
The MITs-1 device is a high-precision measuring device based on advanced digital technologies. The device is used at power supply objects for measuring voltage and current characteristics, including basic energy quality parameters, and power and energy in single-phase and three-phase ac networks.

Field of application
Measurement of major energy quality parameters, inspection of factory power networks (energy audit), monitoring of electrical networks, metering of power flows in power supply systems, intersystem flows, energy generation and consumption, emergency oscillography.

Functionality
- Direct connection to single- and three-phase 0.38 kV networks, connection to networks with larger voltages through measuring transformers;
- Measurement of continuous (analog) parameters of the controlled power network;
- Measurement of energy quality parameters;
- Multirate metering of active and reactive energy in four quadrants;
- Reception of discrete telesignalization (TS) signals, issue of telecontrol (TC) signals;
- Identification of emergency situations and digital oscillography;
- Utilization of up to 250 settings for any measured parameters and discrete telesignalization inputs;
- Control of the device and viewing of the results with the help of a comprehensive menu system;
- Password protection against unauthorized change of settings;
- Logging of various events, operation and restoration of settings, change of the device state with binding to real (astronomical) time;
- Accumulation and long-term storing of data on a flash disk;
- Possibility of transmission of all data to an external environment via the RS-232 and RS-485 interfaces.
The device is manufactured in two versions:
– MITs-1A: full-featured version for fixed installation;
– MITs-1B: portable version (has a holder and adjustable legs) without TS inputs and TC outputs.

 Basic characteristics

Measured voltage characteristics:
- phase voltages	10 to 545 V     δ = ±0.2 %
- line voltages	10 to 545 V     δ = ±0.2 %
- positive phase-sequence voltage	10 to 545 V     δ = ±0.5 %
- zero- and negative phase-sequence voltages	0.55 to 10 V     Δ = ±0.5 V    10 to 545 V     δ = ±0.5 %
-auxiliary channel voltage
ac	10 to 460 V     δ = ±1 %
dc	14 to 650 V     δ = ±1 %
Measured current characteristics:
- phase currents	0.1 to 3 А     Δ = ±0.2 %
- neutral current	0.01 to 3 А       Δ = ±0.01 А
- positive phase-sequence current	0.1 to 3 А    Δ = ±0.01 А
- negative phase-sequence current	0.01 до 3 А     Δ = ±0.01 А
- auxiliary dc channel current	0.5 to 20 мА       Δ = ±0.2 мА
Measured power characteristics  (phase-by-phase  and system-wise):
-  active, reactive, total power	up to 2,8·1010      δ = ±0,5 %
- direction	direct,       reverse
- power factor	–1 to 1       Δangle = ±1°
Measured energy characteristics:
- active energy metering	class 0.2S acc.  to GOST 30206-94
- reactive energy metering	class 0.5 acc.  to GOST 26035-85
- energy flow direction	consumption,     generation
- multirate metering	16 meters,    12 seasons,     8 rates
Measured characteristics of voltage and current  sinusoid distortion:
- sinusoid distortion factor	1 to 30 %      δ = ±5 %
- n-th harmonic component factor (n=2-15)	0.5 to 1 %    Δ = ±0.05 %     1 to 30 %       δ = ±5 %
Discrete channels	2 TS channels,    4 TC channels
Digital oscillography:
- sampling rate (for mains frequency period)	8 to 64 samples
- oscillogram duration	up to 60 sec
- pre-history length	up to 3000 samples
- quantity of simultaneously stored oscillograms	up to  200
- data storing time	unlimited
Communication channel characteristics:
- interface type	RS-232C,    RS-485
- data rate	up to 38400 bps
- message format	Modbus RTU
Power supply:
- ac mains	100 to 260 V,    50 Hz, 50 VA
- dc mains	100 to 300 V,          50 W
Operating temperature range	–20 to +50 °С
Dimensions	240×180×275 mm
Weight	max 4.0 kg

Note:    δ – relative measurement error
            Δ – absolute measurement error

Integration of the device into automated systems

Questions to the developers:
Tel.: (+375 17) 267 17 61
E-mail: s1@niisa.iptel.by