OVERVIEW
The RDBK-Ⅲ transformer no load tester is specifically designed for testing the no-load loss, load loss, short-circuit impedance, and zero-sequence impedance of transformers. This instrument is suitable for measuring low voltage short-circuit impedance of transformers with ratings of 35kV and above, both in the field and laboratory settings. The instrument features a compact design, excellent performance, and powerful functions. It utilizes the latest domestic and international single-chip microcomputer testing technology, advanced A/D synchronous AC sampling, and digital signal processing technology, ensuring accurate measurement data. The instrument has a large-screen color LCD, menu prompts for easy operation, a high-speed thermal printer, and storage functionality, making data storage and printing convenient. The stored data can be transferred to a computer via a USB interface. The instrument is small, lightweight, and easy to carry, making it extremely convenient for field use, significantly reducing the labor intensity of testing personnel and improving work efficiency.
CHARACTERISTIC
1.The instrument can measure single-phase, three-phase, and zero-sequence impedance (connected to the neutral point).
2.It automatically calculates the transformer’s impedance voltage percentage, converting it to rated temperature and current. Using the nameplate impedance, the error percentage is also calculated.
3.The test results are automatically converted, including frequency correction, temperature conversion, and current conversion, significantly improving the comparability of the test data.
4.The transformer no load tester offers two power modes: internal power supply and external single-phase voltage regulator power supply.
5.It has a wide voltage and current measurement range with high accuracy.
6.The operation is simple, with a 7.0-inch touch screen for easy use.
7.It has a built-in high-capacity, non-volatile memory can store 160 data sets.
8.Equipped with a high-speed mini thermal printer, it can print measurement data.
9.The instrument has a built-in high-precision clock, displaying the real-time time.
10.It supports USB storage functionality, facilitating data storage and export.
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FAQ
Q: What is the no-load test on a transformer?
A: No-load testing on a transformer involves energizing the primary winding with the secondary winding open and measuring no-load current, power factor, and core losses at rated voltage. These measurements assess core losses, iron losses, and overall efficiency under no-load conditions, ensuring the transformer meets operational specifications.
Q: How do you check a transformer load?
A: In determining the load of a three-phase transformer, the calculation involves the formula P = VI√3/1000. While the multiplication by √3 (or 1.732) is a key step, the overall procedure, including the division of the startup current required by the device, remains unchanged.
Q: How is no load current measured in the transformer?
A: In the no-load test, the transformer’s primary coil receives rated voltage while other coils stay open. This test gauges the transformer’s no-load loss and no-load current, expressed as a percentage of its rated current.
Q: What is load and no load in the transformer?
A: In a transformer, the “load” is when it supplies power to connected devices, causing losses, while “no-load” is when it’s energized but not actively transferring power to external loads, incurring primarily core losses.
