Single-Phase Relay Protection Calibration Instrument - Yangzhou Dary
Functions
1.Single-Phase Relay Protection Calibration Instrument can test various AC/DC, current, voltage, intermediate, self-holding, signal and other single relays and complete relay protection panels. It can test the pickup voltage (current) value, release voltage (current) value of various relays, and the pickup time and release time of various contacts (normally open, normally closed, changeover, delay). It automatically tests three times and stores the data, automatically calculates the return coefficient of the three average values and prints them, and can repeatedly display and print test results.
2. It can conveniently test various parameters of reclosing relays.
3. It is equipped with frequency measurement and phase measurement functions, which can measure the frequency of current and voltage (displaying the time of one cycle, i.e., the period) and the phase difference (time) between two signals.
4. It is equipped with two channels, both of which are isolated from other outputs of the instrument, making it convenient to measure live contacts, meeting the online testing of relays, with simple wiring and safety.
5. It adopts an advanced timing reference (10 microseconds) and a counter up to 100 hours, so it can be used alone as a millisecond meter to replace the traditional stopwatch.
Features
1. Embedded host, equipped with large-scale programmable logic device (CPLD)
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 fitted 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 the filtering circuit, the waveform distortion is small. When outputting harmonics, even for the 9th harmonic at 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 unit with 12-channel D/A simultaneous output
Using 16-bit DAC chips to ensure high precision and good linearity of the fitted waveform. It can output 12 analog signals simultaneously, meeting the testing of transformer protection, standby power supply automatic switching, etc.
3. Linear power amplifier, simultaneous output of 6-phase voltage and 6-phase current
The carefully designed voltage and current amplifiers achieve AC/DC sharing, and the output stage adopts unique ultra-linear amplification technology. With high precision and good reliability, it can simultaneously output 6-phase AC voltage and 6-phase AC current. Each phase AC voltage output is up to 130V, 70VA, and the AC current full parallel output is up to 180A. DC voltage output can reach 300V, 130VA.
4. Large-screen LCD, complete interfaces, integrated single-unit structure
This instrument uses a 640×480 dot matrix 8.0'' large-screen high-resolution graphic LCD. The operation interface and test results are all displayed in Chinese. All operation processes are set on the display screen, with clear and intuitive display. 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 portable and very suitable for mobile testing and field work.
5. Auxiliary DC source (optional)
This instrument can be optionally equipped with two sets of DC power supplies: one set is 110VDC/1.0A, and the other is 220VDC/0.6A. They are automatically output simultaneously at power-on and can be used as protection power supply without software settings and adjustments.
6. Intelligent self-protection
Adopting a newly designed heat dissipation structure to ensure good ventilation. It can simultaneously judge overcurrent, overvoltage, overload, short circuit, excessive temperature, data abnormality and other phenomena that endanger the safety of the device itself. Even operational errors will not damage the device. In addition, when dangerous signals such as external voltage enter the tester through terminals, the device alarm indicator light turns red and automatically cuts off the power amplifier.
7. Rich contacts and 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 both dry contacts and 0-250V potential contacts, and can be intelligently identified. The device is operated through the large-screen LCD with 23 keys on the panel, and all interfaces are displayed in Chinese. It can complete the verification work of most on-site 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 connected to an external PC for operation. The test results can be automatically organized and recorded into test reports for future reference. They can also be directly saved using a U disk and conveniently transferred to an external PC for editing, printing, and other processing. Software upgrades are simple and fast, directly through U disk upgrade or external PC download, without changing any hardware.
The software has powerful auxiliary calculation functions, which can automatically calculate positive, negative, and zero sequence voltage and current, primary and secondary active power, reactive power, and power factor. The 6-phase voltage and 6-phase current outputs can be used for dual-group tests of standby power supply automatic switching and three-phase differential tests of transformers, with very simple wiring.
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 restraint characteristics of the transformer.
9. Per-phase differential test menu
According to the working principle of transformer differential protection, it automatically tests the percentage restraint characteristics, harmonic restraint characteristics, and DC magnetizing characteristics of the transformer.
Note: The above information and technical parameters are compiled and released by Yangzhou Dary Electric Co., Ltd.
