The host adopts a high-speed high-performance embedded microcomputer system equipped with CPLD, with fast response speed, wide transmission bandwidth, and can generate a high-density fitting sine wave of 500 points per cycle for the fundamental wave. The output waveform is smooth and free of harmonic components. Due to the large number of output points and precise filtering circuits, the waveform distortion is extremely small. When outputting harmonics, even for the 9th harmonic, 450Hz, a high density of 55 points per cycle can be achieved. The software has very strong human-machine dialogue and online help functions, and can control any test parameter.
2. Single-machine 12-channel D/A simultaneous output
Uses 16-bit high-precision DAC chip to ensure high precision and good linearity of the fitting waveform. It can output 12 analog signals simultaneously, meeting the comprehensive testing requirements of transformer protection, standby power supply automatic switching, etc.
3. High-precision linear power amplifier, simultaneous output of 6-phase voltage and 6-phase current
The carefully designed voltage and current amplifiers realize AC/DC sharing, and the output stage adopts unique high-precision ultra-linear amplification technology. High precision, good reliability, simultaneous output of 6-phase AC voltage and 6-phase AC current, each phase AC voltage output up to 130V, 70VA, AC current full parallel output up to 180A. DC voltage output up to 300V, 130VA.
4. Large-screen LCD, complete interfaces, host integrated single-box structure
This machine adopts a 640×480 dot matrix 8.0'' large-screen high-resolution graphic LCD display. The operation interface and test results are all displayed in Chinese. All operation processes are set on the display screen, which is intuitive and clear. The device can be operated with its own keyboard, and also provides external keyboard/mouse ports. It also provides 2 USB ports and 2 RS232 ports for communication with external computers and other devices. It only needs AC 220V power supply and can work immediately after power-on. It is easy to carry and very suitable for mobile tests and field work.
5. Auxiliary DC source (optional)
This machine can be optionally equipped with two independent DC power supplies, one group 110VDC/1.0A, the other group 220VDC/0.6A, automatically output simultaneously after power-on, can be used as protection power supply, no need for software settings and adjustments.
6. Intelligent self-protection
The latest designed heat dissipation structure ensures the best ventilation. It can simultaneously judge overcurrent, overvoltage, overload, short circuit, excessive temperature, abnormal data and other phenomena that endanger the safety of the device itself. Even if the operation is wrong, the device will not be damaged. In addition, when dangerous signals such as external voltage enter the tester through the terminal, the device alarm indicator light turns red and automatically cuts off the power amplifier.
7. Rich contacts, powerful software functions
This device has eight switch quantity inputs (A B C R a b c r) and 4 switch quantity outputs. The input contacts are compatible with empty contacts and 0-250V potential contacts, and can be intelligently identified. The device is operated through the large-screen LCD display with 23 keys on the panel, and all interfaces are displayed in Chinese. It can complete the verification work of most field tests. It can also conveniently complete the protection device tests of foreign manufacturers such as ABB, Siemens, AREVA, etc.
The device can be placed vertically or horizontally, can be operated offline, or can be operated with an external PC. The test results can be automatically organized and recorded into test reports for future reference. It can also be directly saved using a U disk and conveniently transferred to an external PC for editing, printing, etc. Software upgrade is simple and fast, directly through U disk upgrade or external PC download, without changing any hardware.
The software auxiliary calculation function is powerful, and can automatically calculate positive, negative, zero sequence voltage and current, primary and secondary active power, reactive power, power factor. The 6-phase voltage and 6-phase current output can perform dual-group tests of standby power supply automatic switching and three-phase differential tests of transformers, and the wiring is very simple.
8. Special design for railway
Specially designed electric railway differential test menu, according to the working principle of electric railway traction transformer differential protection, automatically tests the percentage braking characteristics of the transformer.
9. Per-phase differential test menu
According to the working principle of transformer differential protection, automatically test the percentage braking characteristics, harmonic braking characteristics and DC magnetizing characteristics of the transformer.
Note: The above information and technical parameters are compiled and released by Yangzhou Dari Electric Co., Ltd.
