MEWOI6000-Power Quality Analyzer

Ⅰ.Introduction

MEWOI6000 power quality analyzer is a product carefully developed by our company and specially designed for field test of three phases, multi-functional and intelligent, man-machine operation and concise and comprehensive test instrument. It is easy to use, large LCD screen display, high resolution, interface in both Chinese and English, shock-proof shell structure and so on. Can simultaneously measure the 4-channel current (ABC three phase and neutral wire current), 4-channel voltage (ABC three-phase voltage and neutral line voltage to ground), the peak value of current voltage, maximum/minimum value over a period, three-phase imbalance factor, short-time voltage flicker, transformer K factor, active power, reactive power, apparent power, power factor and displacement power factor, active power, reactive power, apparent power, total harmonic distortion and harmonic, etc; Display real-time waveform, harmonic ratio bar charts of current voltage; Dynamically capture instantaneous change of voltage current, monitoring starting current, monitoring the power parameters and generate the alarm list, generate the trend chart for a long time record test data.

MEWOI6000 power quality analyzer adopt DSP + ARM double processor architecture, DSP is use for data collection and the processing of algorithm, the ARM is use for the communication protocol and the man-machine interface processing; Analog signal acquisition is by 2 pieces AD7655 of ADI company. Resolution for AD7655 is 16 bit and it is 4 channel synchronous sampling. The highest sampling rate can reach 1 MSPS, to ensure the accuracy of the channel and the information integrity, and wouldn’t miss any transient changes in the grid, can more accurate to detect the transient waveform rising and dropping drastically, and waveform instantaneous interrupt; DSP working frequency is over 200 MHZ, to be able to timely monitoring of the power grid and dynamically adjust the sampling frequency to realize synchronization of power frequency and sampling frequency; Using a 5.6 -inch LCD color screen display, a resolution of 640 dots x 480 dots, with different display color difference between the parameters of phase, waveform, vector diagram, harmonic ratio, the user can be more efficient and more intuitive understand the state of power grid parameters. Built-in flash memory can store 60 group of screenshots at the same time, 150 groups of capture transient voltage/current waveform figure, and 12800 groups of alarm list. Starting current detection model can continuously capture starting current waveform for 100 s. Built-in 2G memory card to store the trend curve record, store all the parameters (including 50 harmonics with 123 power parameters), collect data for once every five seconds, trend curve records can be stored for 300 days.

Ⅱ.Function Specification

Function	Function specification
Test Function	4 channel voltage and the 4 channel current waveform real-time display
	True RMS of voltage and current
	DC component of Voltage
	Peak value of current and voltage
	Minimum/maximum values over a period of time of Current and voltage
	Phasor diagram display
	Measurement of harmonic of each phase, up to 50 harmonics
	Display harmonics ratio of current and voltage of each phase
	The calculation of total harmonic distortion(THD)
	Active/reactive/apparent power value and gross of each phase
	Active/reactive/apparent electric energy value and gross of each phase
	Calculation of transformer K factor
	Calculation of COSΦ displacement power factor(DPF) and power factor(PF)
	Calculation of flicker
	Calculation of three phase unbalance
Function of capture and monitoring	Can monitoring instantaneous change of power grid voltage current parameters, including the voltage fluctuation and flicker, voltage surge, sag and short supply interruption, temporary overvoltage and harmonics. Instruments and can store 150 groups of transient waveform
Function of starting current monitoring	Can monitor the startup current when electrical equipment is starting, help to correctly design capacity. It can display the trend curve of effective value of starting current, the starting current envelope curve, current voltage waveform of the all eight channel. Monitoring for 100 s, can store each cycle of all waveform curve points within 100 s .
Function of storage	Can totally record 123 parameters such as the testing parameter of base testing function(Urms、Uthd、Ucf、Uunb、Hz、Vrms、Vthd、Vcf、Vunb、PST、Arms、Athd、Acf、Aunb、KF、W、VAR、VA、PF、Cos φ、Tan φ),50 harmonics of voltage, 50 harmonic of current. Generate trend curve, the interval time of recording is able to set, collect once for 5s and can stored 75days.
Alarm function	Users can set up 40 groups alarm monitoring project, each group can set different judgments parameters (including 50 harmonics a total of 123 different parameters), can be set different alarm threshold, how long it will take to produce the alarm when over the critical value is can be set, etc. Can store up to a maximum of 12800 set alarm record.
Screenshots function	In any test page screenshots can store the current screen, automatically records the time and test mode at the same time. Such as save the current voltage wave, harmonic bar charts and phasor diagram, etc. Screenshots can be saved up to 60 groups.
Communication function	Communicate with computer by USB interface, monitoring software can display waveform of power quality analysis, able to read those has been detected and captured like transient waveform, trend curve record, alarm list, test screenshots, etc.
Setting function	The user can set the time and date, set the display contrast ratio and brightness, set each corresponding color of each phase line in the instrument
	The connection mode of instruments and the grid type can be set
	Can select different current clamp and different voltage test strain ratio
	Can be selected menu in Chinese or English menu
Chinese/English help menu	Each phase of the operation may at any time by pressing "help" key for related information

Technical Specification

1. General specification

Power supply	Rechargeable lithium-ion battery pack 9.6V, 4500mAH , backup charger
Battery indicator	Battery symbol shows dump energy, When the voltage is too low, automatic shutdown after the 1 minute
Power consumption	Current consumption of normal test 490mA, continuous working for 8 hours
Power consumption	Close the LCD low-power monitoring mode170mA, battery continuous working for 20hours
Display mode	LCD color screen,640dots×480dots ,5.6 inches, display demo:116mm×88mm
Instrument dimensions	LxWxT:240mm×170mm×68 mm
Size of clamp	008B current clamp:7.5mm×13mm; 040B current clamp:35mm×40mm; 068B current clamp: 68mm×68mm
Number of channels	4U/4I
Line voltage	1.0V~2000V
Phase voltage	1.0V~1000V
Current	008B current clamp 10mA~10.0A; 040 current clamp 0.10A~100A; 068B current clamp 1.0A~1000A; Optional Current Clamp,input current 1mA ~ 500mA
Frequency	40Hz~70Hz
Parameters of electricity	W, VA, var, PF, DPF, cos φ, tan φ
power parameter	Wh, varh, Vah
Harmonic	0~50times
Total harmonic distortion	0~50 times, each phase
Model	Waveform model, harmonic model, Power and power energy mode, Waveform capture mode, Trend chart pattern, alarm mode , Screen mode
Set number of Transient record	150sets
Recode	300 days(recode 20 sets parameter at the same time, recode one point in 5 seconds)
Min/Max records	Can be measured maximum minimum value over a period of time
Warning	40 different types of parameter selection,12800set warning record
Phasor diagram display	Automatically
Capacity of screenshots	60
Language of manual	Chinese and English
Communication	USB
Automatically shutdown	At alarm/trend chart records/transient capture mode (pending or ongoing), 5 minutes without keystrokes, monitoring instruments automatically in o low power mode, press any key to activate.
Automatically shutdown	In other test mode, 15 minutes without keystrokes, prompt automatic shutdown after 1 minute
Quality of the instrument	6Kg(with package)
length of test line	Current clamp cable:2M; Voltage Cable: 3M
Working temperature	-10℃~40℃; below 80%Rh
Working humidity	-10℃~60℃; below 80%Rh
Input impedance	Input impedance for the test voltage:1MΩ
Withstand voltage	Can withstand 3700V / 50Hz sinusoidal ac voltage for 1 minute between Instrument wiring and the shell
Insulation	Between instrument wiring and shell≥10MΩ
Structure	Double insulation, vibration-proof jacket with insulation
Safety rules	IEC 61010 1000V Cat III / 600V CAT IV,IEC61010-031,IEC61326,pollusion 2
Accessories	Host:1pcs; Case:1pcs; Current Clamp: 008B,040B,068B 4PCS(3*4=12PCS); Cable:5pcs(yellow, green, red, blue, black ); Alligator clip 5pcs; Pin 5pcs; Charger 1pcs; Soft ware 1pcs; 2Gmemory card(in host) 1pcs.

2. Accuracy of instruction (under the base condition)

Measurement specification	Range	Display resolution	The maximum error in the range of the reference
Frequency	40Hz~70Hz	0.01Hz	±(0.03)Hz
True RMS phase voltage	1.0V~1000V	Min resolution0.1V	±(0.5%+5dgt)
True RMS line voltage	1.0V~2000V	Min resolution0.1V	±(0.5%+5dgt)
DC Voltage	1.0V~1000V	Min resolution0.1V	±(1.0%+5dgt)
True RMS current	10.0mA~1000A	Min resolution0.1mA	±(0.5%+5dgt)
Phase voltage peak	1.0V~1414V	Min resolution0.1V	±(1.0%+5dgt)
Line voltage peak	1.0V～2828V	Min resolution0.1V	±(1.0%+5dgt)
Current peak	0.0mA~1414A	Min resolution0.1mA	±(1.0%+5dgt)
Peak factor	1.00~3.99	0.01	±(1%+2dgt)
Peak factor	4.00~9.99	0.01	±(5%+2dgt)
Active power	0.000W~9999.9KW	Min resolution 0.001W	±(1%+3dgt);Cosφ≥0.8
Active power	0.000W~9999.9KW	Min resolution 0.001W	±(1.5%+10dgt);0.2≤Cosφ<0.8
Reactive power Inductive & Capacitive	0.000VAR~9999.9KVAR	Min resolution 0.001VAR	±(1%+3dgt);Sinφ≥0.5
Reactive power Inductive & Capacitive	0.000VAR~9999.9KVAR	Min resolution 0.001VAR	±(1.5%+10dgt);0.2≤Sinφ<0.5
Apparent power	0.000VA~9999.9KVA	Min resolution 0.001VA	±(1+3dgt %)
Power factor	-1.000~1.000	0.001	±(1.5%+3dgt);Cosφ≥0.5
Power factor	-1.000~1.000	0.001	±(1.5%+10dgt);0.2≤Cosφ<0.5
Active energy	0.000Wh~9999.9MWh	Min resolution 0.001Wh	±(1%+3dgt);Cosφ≥0.8
Active energy	0.000Wh~9999.9MWh	Min resolution 0.001Wh	±(1.5%+10dgt);0.2≤Cosφ<0.8
Reactive energy Inductive & Capacitive	0.000VARh~9999.9MVARh	Min resolution 0.001VARh	±(1%+3dgt);Sinφ≥0.5
Reactive energy Inductive & Capacitive	0.000VARh~9999.9MVARh	Min resolution 0.001VARh	±(1.5%+10dgt);0.2≤Sinφ<0.5
Apparent power	0.000VA~9999.9MVAh	Min resolution 0.001VAh	±(1%+3dgt)
Phase angle	-179°~180°	1°	±(2°)
Tan φ(VA≥50VA)	-32.76～32.76	Min resolution 0.001	φ:±(1°)
The displacement power factor (DPF)	-1.000~1.000	0.001	±(1%+5dgt)
Harmonicratio(Vrms>50V)	0.0 %~99.9 %	0.1 %	±(1%+5dgt)
Harmonic Angle(Vrms>50V)	-179°~180°	1°	±(3°)harmonic1~25
Harmonic Angle(Vrms>50V)	-179°~180°	1°	±(10°)harmonic26~50
Rate of total harmonic (DF or THD-F)≤50	0.0 %~99.9 %	0.1 %	±(1%+5dgt)
Distortion factor (DF or THD-R)≤50	0.0 %~99.9 %	0.1 %	±(1%+10dgt)
Transformer K factor	1.00~99.99	0.01	± (5 %)
Three-phase imbalance	0.0%~100 %	0.1 %	± (1 %)

3. Feature of current clamp

Model	True RMS current	Max error True RMS current	Max error of Phase Angle Φ
MEWOI 108C Ф8mm	10mA~99mA	±(1 % + 3dgt)	±(1.5°),Arms≥20mA
MEWOI 108C Ф8mm	100mA~10.0A	±(1 % + 3dgt)	±(1°)
MEWOI 140C Ф40mm	0.10A~0.99A	±(1 % + 3dgt)	±(1.5°)
MEWOI 140C Ф40mm	1.00A~100A	±(1 % + 3dgt)	±(1°)
MEWOI 168C Ф68mm	1.0A~9.9A	±(2 % + 3dgt)	±(3°)
MEWOI 168C Ф68mm	10.0A~1000A	±(2 % + 3dgt)	±(2°)

Host:1pcs; Case:1pcs; Current Clamp: 008B,040B,068B 4PCS(3*4=12PCS); Cable:5pcs(yellow, green, red, blue, black ); Alligator clip 5pcs; Pin 5pcs; Charger 1pcs; Soft ware 1pcs; 2Gmemory card(in host) 1pcs.