Related Manuals for UNI-T UT225A
Summary of Contents for UNI-T UT225A
- Page 1 UT225A Transformer Turns Ratio Receiver UT225A UT225A Flex Clamp Sensor Low Voltage Transformer Turns Ratio Tester P/N:110401111865X ...
-
Page 2: Table Of Contents
Contents Introduction ..........................2 Model ............................2 Product Structure ........................2 III. IV. Working Principle ........................3 Standard Condition ........................4 VI. Technical Parameters ......................5 VII. Application ..........................6 Power On/Off ........................6 Setting of Transformer Turns Ratio and Ratio Difference ..........6 Testing of Transformer Turns Ratio .................. -
Page 3: Introduction
UT225A consists of tester, primary current transformer (CT1) and secondary current transformer (CT2). With small clamp diameter at 8mm, UT225A is suitable to use in narrow space and environments with concentrated cables, making it a safe, accurate and portable measurement meter for technicians. -
Page 4: Working Principle
Primary current clamp(CT1) Host meter Secondary current clamp(CT2) 1. Primary current transformer (CT1) 2. Switch of primary current transformer 3. Antenna 4. Display screen 5. MEM buttons (5 pcs) 6. Tester 7. Secondary current transformer (CT2) IV. Working Principle In 380/220V power system, without the need to shut down the power, perform sampling on primary and secondary loop current of current transformer by using CT1 and CT2, conduct signal processing, amplification, filtering and A/D conversion, and then input to the central processing unit of the tester. -
Page 5: Standard Condition
V. Standard Condition Influence quantity Standard condition Working condition Remark Ambient 23°C~±5°C -15°C~50°C temperature Ambient humidity 40%~60% Distortion of sinusoidal wave Signal frequency 50Hz±5Hz 45Hz~65Hz External electric and Shall be avoided magnetic fields Position of Place the measured conductor at the center of the measured conductor clamp jaws VI. -
Page 6: Application
Accuracy: ±1%FS Measurement accuracy of Range: 0.00mA~5A secondary current Resolution: 0.01mA transformer Accuracy: ±0.5%FS Measurement range of 1~500 transformer ratio Resolution of transformer ratio Dimensions of primary CT size: 200mm current transformer External dimensions: 200mm×370mm×40mm Dimensions of secondary Clamp jaw size: current transformer External dimensions: 137mm×40mm×19.5mm... - Page 7 (Testing interface) Under wireless reception state, the CT1 is in power off state, or fails to connect with tester via wirelessly due to signal interference, then “No signal” indication appears on the LCD. (Wireless reception failed) After the tester powers on for 15 minutes, the LCD flashes continuously to indicate auto power off.
- Page 8 (Setting of Transformer Ratio and Ratio Difference) For example, set the transformer ratio at 150/5A and the ratio difference (error) at 3%. The set transformer ratio shall be consistent with the value on the nameplate of the current transformer. If the actual tested ratio difference exceeds the set error, the symbol “OL”...
-
Page 9: Data Lock/Storage/Unlock
(Angle difference parameters) On-site wire connection diagram: In-phase : If the phase difference is about 0°~30° or 330°~360°, it is in-phase polarity. Out-phase : If the phase difference is about 150°~210°, it is out- phase, the phase of the current lead clamped by CT1 and CT2 are not in- phase. -
Page 10: Battery Replacement
▶ Press “ ” to view data, and to display the stored data of “0001” group automatically. Press ◀ ▶ “ ” and “ ” to move the cursor, press “ ” to confirm and return. The tester is designed with fast viewing function (“+1, -1, +10, -10”), press “... - Page 11 The content of this user manual cannot be used as a reason for using the product for special purposes. The company is not responsible for other losses caused by use. The company reserves the right to modify the contents of the user manual. If there are changes, no further notice will be given.