Features Of Relay Protection Tester

1. Embedded host, equipped with ultra-large-scale programmable logic device (CPLD)
The main engine adopts high-speed and high-performance embedded microcomputer system equipped with CPLD, which has fast response speed and wide transmission frequency range. It can generate high-density fitting sine waves with 500 points per cycle for the fundamental wave, and the output waveform is smooth without harmonic components. Due to the large number of output points and the precise filter circuit, the distortion of the waveform is extremely small. When outputting harmonics, even for the 9th harmonic and 450Hz, it can reach a high density of 55 points per cycle. The software has very strong man-machine dialogue and online help functions, and can control any test parameters.
2. Single 12-way D/A simultaneous output
16-bit high-precision DAC chip is used to ensure high precision and good linearity of the fitted waveform. It can output 12 channels of analog signals at the same time to meet all-round tests such as transformer protection and backup power supply self-injection.
3. High-precision linear power amplifier, output 6-phase voltage and 6-phase current at the same time
Well-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, output 6-phase AC voltage and 6-phase AC current at the same time, each phase AC voltage output up to 130V, 70VA, and AC current output up to 180A. DC voltage output up to 300V, 130VA.
4. Large-screen LCD, complete interface, host integrated single-chassis 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, and all operation processes are set on the display screen, which is intuitive and clear. The device can be operated with its own keyboard, and an external keyboard/mouse port is also provided. It also provides 2 USB ports and 2 RS232 ports, which can communicate with external computers and other devices. It only needs AC 220V power supply, and it can work when it is turned on. It is easy to carry and is very suitable for mobile experiments and field work.
5. Auxiliary DC source (optional)
This machine can be equipped with two sets of independent DC power supplies, one set of 110VDC/1.0A, the other set of 220VDC/0.6A, which can be automatically output at the same time when starting up, and can be used as a protection power supply without software setting and adjustment.
6. Intelligent self-protection
Adopt the latest heat dissipation structure to ensure the best ventilation. It can also judge over-current, over-voltage, overload, short-circuit, over-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 a dangerous signal such as external voltage enters the tester through the terminal, the alarm indicator of the device turns red and automatically cuts off the power amplifier.
7. Rich contacts and powerful software functions
The device has eight switch inputs (A B C R a b c r) and four switch outputs. The input contact is compatible with empty contact and 0-250V potential contact, which can be intelligently identified. The device is operated by 23 buttons on the panel through a large-screen LCD display, and all interfaces are displayed in Chinese. It can complete the verification work of most of the tests on site. It can also conveniently complete the protective device tests of foreign manufacturers such as ABB, Siemens, and AREVA.
The device can be placed vertically or horizontally. It can be operated offline or connected to an external PC. The test results can be automatically sorted and recorded as a test report for future reference. It can also be directly saved using a U disk and conveniently transferred to an external PC. Editing, printing, etc. The software upgrade is simple and quick, and it can be directly upgraded through a U disk or downloaded from an external PC without changing any hardware.
The software-aided calculation function is powerful, which can automatically calculate positive, negative and zero-sequence voltage and current, primary and secondary side active power, reactive power and power factor. 6-phase voltage and 6-phase current output can be used for dual-group test of automatic switching of backup power supply and three-phase differential test of transformer, 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 test the proportional braking characteristics of the transformer.
9. Phase differential test menu
According to the working principle of transformer differential protection, the proportional braking characteristics, harmonic braking characteristics and DC magnetic assist characteristics of transformers are automatically tested.