Huazheng Manufacture HZKZ-50A Transformer Capacity On-no Load Loss Tester

HZKZ-50A Transformer On-No Load Characteristics Analyzer is the latest product of Huazheng Electric Manufacturing (Baoding) Co., Ltd. The instrument adopts the popular ARM processor in this year, with 168M basic frequency and 128m memory, which can be expanded to 4G memory card. Using 7-inch high-definition color touch panel, combined with emwin display interface so as to make the instrument interface being friendly and operated in a simple way, it can be operated through the touchscreen without keyboard. The instrument support database and can be exported through USB disk or transmitted to computer via data wire.

Introduction

The circuit design of this instrument is exquisite and unique, which makes it superior in performance, powerful in function, small in size and light in weight. It can not only be used to test the on-no load parameters of transformer, but also measure the harmonic content and waveform in the field. The instrument can record the test curve of transformer under on-no load condition, then provide reliable basis for transformer fault analysis.

Wiring And Attention

1. When using the instrument, please follow the instructions to wire and operate.

2. The earthing terminal or grounding terminal of power wire should be reliably grounded nearby.

3. Please input the correct setting parameters before testing. Inputting the storage sequence number could save the test results under this record number. Then set the parameters according to the parameters of the tested transformer. After setting up, click the “Save Changes” button to save and enter the test interface. Select the parameters that needed to be tested (impedance or parameter), click the “Start” button, and then slowly raise the test voltage to complete the test. When the test is ended, you can click the “End” button and saved the test record to complete the test.

4. The instrument is operated by full touch screen, please do not bump it.

Main Functions And Characteristics

1. The instrument adopts 7-inch true color LED. It can measure voltage, current, angle, power and other electrical parameters, and it also can display the vector diagram of voltage and current, both of the displays are shown clearly and intuitively on the same screen.

2. It can measure the parameters such as no-load loss, load loss and impedance voltage, etc.

3. The instrument has the function of harmonic analysis. It can measure the 1-32 harmonic content of voltage and current applied to transformer and display bar graph as well as voltage and current waveform.

4. The on-no characteristic curve under different voltage and current can be recorded automatically during the test process of on-no load condition of transformer, which can be more convenient to analyze the characteristics of transformer and core.

5.It can be directly measured within the allowable measuring range of the instrument. If it is beyond the measuring range, external voltage and current transformers can be connected. The instrument can set the transformation ratio of external voltage and current transformers to directly display the applied voltage and current values.

6. With the function of data storage and data browsing, the instrument supports DBF database, and it can store test data or browse test records according to user requirements. The instrument also supports the USB disk export function, you can export the test data through USB disk, and the database supports the excel spreadsheet opening mode, which is convenient for editing, printing or archiving.

7. Operate with 7-inch true color touch screen, the GUI interface, with build-in 128M memory (extensible 4G memory card), it supports English and is easy to operate.

8. It is small in size, light in weight, accurate in measurement, no power off calendar and clock function, so it can store test time at any time.

Note1: For the transformer with tapped windings, short circuit impedance need to appoint the tap, if there is no special instruction, it is the principal tap. For the three phase transformer, it means the impedance of single phase.

Note 2: It can be represented using non-dimensional relative value that means fraction Z of reference impedance Zref in same winding of one pair windings, as follows:

Formula is suitable for the three phase and single phase transformer.

U——Voltage of Z and Zref in windings（rated voltage or tapped voltage）

Sr——Basic value of rated capacity.

The relative value is equal to the ratio between the voltage and rated voltage (tapped voltage) when operator wants to get the rated current (tapped current) in short circuit test. This voltage also called the short-circuit voltage of this pair windings. It is generally expressed as a percentage.