UNI-T UT268B Intelligent 3 Phase Voltammeter User Manual

UNI-T UT268B Intelligent 3 Phase Voltammeter

Product Information

• Product Name: Digital 3-Phase Voltammeter (UT268B)
• Part Number: 110401111944X
• Functions: The Digital 3-Phase Voltammeter is a multifunctional device suitable for use in various industries such as electric power, petrochemical, metallurgy, railway, industrial and mining enterprises, scientific and research institutes, metrology services, electric energy charging systems, and relay protection systems.
• Product Weight: 18719151 mm (LengthWidthThickness)
• Additional Features: The device allows users to upload stored data to a computer via the USB port for analysis and management purposes.
• Safety Information: The user manual contains safety information and symbols that must be followed strictly to prevent personal injury or product damage.
• Electrical Symbols: The user manual includes electrical symbols that indicate the level of danger associated with specific operations.
• Insulation Structure: The device is double-insulated and complies with applicable safety regulations such as IEC61010-1 CAT III 600V, IEC61010-031, IEC61326, and Pollution Class 2.

Product Usage Instructions

1. Read the safety information in the user manual carefully and ensure you understand the symbols and their meanings.
2. Familiarize yourself with the product’s functions and features as described in the user manual.
3. Connect the device to a suitable power supply according to the specified operating conditions.
4. Use the device to measure voltage, current, phase, frequency, and power factor as required for your application.
5. Follow the specified ranges and resolutions for each measurement parameter.
6. Take note of any basic errors mentioned in the performance specifications and adjust your measurements accordingly.
7. Use the data hold function if necessary to freeze the displayed values for further analysis.
8. Utilize the data storage feature to save measurements for later retrieval or upload them to a computer via the USB port.
9. Ensure that the device is properly insulated and meets all applicable safety regulations before use.
10. Follow the recommended operating temperature and humidity conditions for optimal performance.
11. Store the device in appropriate temperature and humidity conditions when not in use.

Safety Information

Thank you for purchasing the product. Before first use, please thoroughly read and strictly follow the safety information and precautions listed in the user manual, to avoid electric shock or personal injury.

• The product is used for live working, for the sake of your safety, please follow the national safe production regulations and safe operation procedures.
• Please pay attention to the labeled words and symbols at the front and rear panels.
• Check if the product and its accessories are complete. Do not use if damage, exposure or broken wire occurs. It is forbidden to use if rear cover and battery cover are not closed in place. Stop use if metal exposure (caused by cracking of casing or test lead) occurs during use.
• Do not measure voltage over 600V. Do not use under strong electromagnetic fields. It is forbidden to conduct test in places with inflammable and dangerous substances.
• Be sure that the plug of the lead connects with terminal tightly, and that the direction is correct when performing phase test. Remove the test lead from measured conductor before disconnecting the test lead with the voltammeter. Do not make contact with the terminal by hand, to avoid electric shock.
• Do not operate the product by wet hand. Avoid rain from dripping on the product. It is forbidden to use in damp state.
• Do not place or keep the product in environments with high temperature, high humidity, dew or direct sunlight for a long time.
• Keep the product surface clean and dry. Do not use clean the product by corrosives or coarse materials, please wipe the current clamp mildly by soft cloth (i.e. glasses cloth) dipped with rust-proof dehumidifying lubricant.
• Please refrain the voltammeter and the current clamps from impact and dropping.
• Use the product in specified measurement range and operating environments.
• Use, disassembly, calibration and maintenance must be performed by authorized qualified personnel.
• The safety warning symbol in the user manual identifies that the operator  must perform safe operation according to the instructions.
• The danger symbol in the user manual identifies that the operator must strictly perform safe operation according to the instructions.

Introduction

The Digital 3-Phase Voltammeter, the latest product in clamp meter series, is a digitalized, multifunctional, high-precision and intelligent multi-parameter industrial-frequency measurement instrument. Designed with latest microprocessor technology and digital signal processing technology, UT268B can measure industrial-frequency parameters (i.e. voltage, RMS current, active/reactive power, apparent power, industrial frequency, power factor, phase relation, and others) in direct AC sampling method, identify transformer connection section and inductive and capacitive circuits, test secondary loop and bus differential protection system, display phase relations between current transformers under differential protection, and check if the wiring of electric energy meter is correct. By using clamp current transformer, this voltammeter can perform measurement without disconnecting from measured conductor, making it a safe, accurate and portable electric power meter. Digital 3-Phase Voltammeter, also known as intelligent 3-Phase Voltammeter, Multifunctional 3-Phase Voltammeter, Digital Clamp Voltammeter, etc., is suitable for use in electric power, petrochemical industry, metallurgy, railway, industrial and mining enterprises, scientific and research institute, metrology service, electric energy charging system, relay protection system, and more.

Functions Introduction

1. Devised with large screen with high-brightness backlight, to clearly display working state and testing parameters.
2. The ability to measure 3-phase voltage, current, phase, frequency, active power, reactive power, apparent power, power factor, and overall power.
3. Can be used to measure grid frequency and phase sequence.
4. The function of phase measurement under small current of 5mA allows for checking wire connection without load.
5. Automatically identify transformer winding and capacitive and inductive loads; and identify wrong connection of 3P3W and 3P4W.
6. Static storage function to enable store 500 groups of data at most.

Electrical Symbols

Technical Specifications

1. Basic Operating Conditions
2. Ambient temperature: (23±5)°C
3. Ambient humidity: (45~75)% RH
4. Waveform of measured signal: Sinusoidal wave, ˜ =0.02
5. Frequency of measured signal: (50±0.2)HZ
6. Location of measured current-carrying conductor at the clamp jaws: At center
7. Current amplitude when measuring phase frequency, phase sequence, power and power factor: 5A±0.2A
8. Voltage amplitude when measuring phase frequency, phase sequence, power and power factor: 220V±20V
9. Electromagnetic interference to external-reference frequency: Shall be avoided.
10. Rated Operating Conditions
11. Ambient temperature: (-15~+45)°C
12. Ambient humidity: (0~90)% RH
13. Operating altitude: <1500 m
14. Waveform of measured signal: Sinusoidal wave, ˜ =0.05
15. Frequency of measured signal: 45~65HZ
16. Current amplitude when measuring phase frequency, phase sequence, power and power factor: 20mA~1000A
17. Voltage amplitude when measuring phase frequency, phase sequence, power and power factor: 20V~600V
18. Location of measured current-carrying conductor at the clamp jaws: Any location
19. General Specifications**
    Functions| Measure 3-phase AC voltage, current, phase between voltages, phase between currents, phase between voltage and current, frequency, phase sequence, active power, reactive power, apparent power, power factor, and current vector sum; identify transformer connection section, inductive circuit, and capacitive circuits; and test secondary loop and bus differential protection system, display the phase relation between differentially-protected CTs of each group, check if the wiring of electric energy meter is correct, repair equipment of measured line, etc.
    ---|---
    Power supply| DC 3.7V large-capacity rechargeable lithium battery
    ---|---
    Power consumption**| 250mA at most with backlight lit up (battery working

duration: >5 hours)

Display mode| LCD display (71×52 mm)
Voltammeter

dimensions

| 18719151 mm (LengthWidthThickness)
Voltage range| AC 0.00V~600V
Current range| AC 0.0mA~1000A
Phase range| 0.0°~360.0°
Frequency range| 45.00Hz~65.00Hz
Active power range| 0.0W~600Kw
Reactive power

range

| 0.0W~600kVAR
Apparent power range| 0.0W~600kVA
Power factor range| -1~+1
3-phase overall power| 3-phase overall power, overall apparent power, overall reactive power and over power factor are displayed in the

line “T”.

Current vector sum| 0mA~3000A
Resolution| Voltage: AC 0.01V
Current: AC 0.1mA
Phase: 0.1°
Frequency: 0.01Hz
Active power: 0.1W
Reactive power: 0.1VAR
Apparent power: 0.1VA
Power factor: 0.001
Current vector sum: 1mA

Phase sequence

| If the phase sequence of “U1, U2 and U3” or “I1, I2 and I3” is positive, then the cursor flashes from left to right in order; if negative, then from right to left.
Testing rate| About 2 seconds per time
Data hold| When the button “HOLD” is pressed during test, the data will be held and the symbol “HOLD” is displayed.
Data storage| 500 groups of data
USB port| Upload stored data to computer via USB port, so as to analyze and manage data.
Auto power off| To reduce power consumption, the voltammeter powers off automatically 15 minutes after it is powered on.
Backlight function| Used in dark environments and at night.
Voltage detection| If the battery voltage is lower than 3.0V, the low battery symbol is displayed to indicate charging in time.
Product weight| Voltammeter: 450 g (including battery)
Large-caliber current clamp: 440 g × 3
Test lead: 250 g
Length of test lead length| 1.5 m
---|---
Length of current clamp lead| 2 m
Operating temperature and humidity| -10°C~40°C; <80%RH
Storage temperature and humidity| -10°C~60°C; <70%RH
Input impedance| 2 M (the input impedance of testing voltage)
Withstand voltage| Apply 1000V/50Hz sinusoidal AC voltage between voltammeter circuit and casing for one minute.
Insulation| 100M (between voltammeter circuit and casing)
Structure| Double-insulated
Applicable safety regulations| IEC61010-1 CAT III 600V, IEC61010-031, IEC61326, Pollution Class 2
4. Performance Specifications**
Type| Range| Resolution| Basic error
---|---|---|---
Voltage| AC 0.00V~9.99V| 0.01V| ± (1.5%rdg+3dgt)
AC 10.0V~99.9V| 0.1V| ± (1.5%rdg+3dgt)
AC 100V~600V| 1V| ± (1.5%rdg+3dgt)
Current| AC 0.0mA~9.9mA| 0.1mA| ± (1.5%rdg+3dgt)
AC 10.0mA ~99.9mA| 0.1mA| ± (1.5%rdg+3dgt)
AC 100mA ~999mA| 1mA| ± (1.5%rdg+3dgt)
1.00A~10.00A| 10mA| ± (1.5%rdg+3dgt)
10.0A~100.0A| 0.1A| ± (1.5%rdg+3dgt)
100A~1000A| 1A| ± (1.5%rdg+3dgt)
Phase| 0.0°~360°| 0.1°| ±1°
Frequency| 45Hz~65Hz| 0.01Hz| ±0.1Hz
Power factor**| -1~+1| 0.001| ±0.03

Note 1: The phase error is ±3° under operating condition (For current amplitude below 30mA, the phase error will be doubled).