| JOS-2000 Relay Protection Test Box |
1. Embedded host with large-scale programmable logic device (CPLD)
The host uses a high-speed high-performance embedded microcomputer system equipped with CPLD, featuring fast response speed, wide transmission bandwidth, and can generate a high-density fitted sine wave of 500 points per cycle for the fundamental wave, with smooth output waveform and no 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 strong human-machine dialogue and online help functions, allowing control over any test parameter.
2. Single-unit 12-channel D/A simultaneous output
Using 16-bit high-precision DAC chips, ensuring high fitting waveform accuracy and good linearity. It can output 12 analog signals simultaneously, meeting the testing requirements for 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 achieve AC/DC sharing, and the output stage adopts unique high-precision ultra-linear amplification technology. With high accuracy and good reliability, it can simultaneously output 6-phase AC voltage and 6-phase AC current, with each phase AC voltage output up to 130V, 70VA, and AC current full parallel output up to 180A. DC voltage output can reach 300V, 130VA.
4. Large LCD screen, complete interfaces, integrated single-unit structure
This unit uses a 640×480 dot matrix 8.0-inch large-screen high-resolution graphic LCD display. The operation interface and test results are displayed in Chinese, and all operation processes are set on the display screen, providing intuitive and clear 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 requires AC 220V power supply and can work immediately after power-on. It is easy to carry and very suitable for mobile testing and field work.
5. Auxiliary DC source (optional)
This unit can be optionally equipped with two independent DC power supplies: one group of 110VDC/1.0A and another group of 220VDC/0.6A, which automatically output simultaneously upon power-on, and can be used as protection power supply without software settings or adjustments.
6. Intelligent self-protection
The newly designed heat dissipation structure ensures good ventilation. It can simultaneously detect overcurrent, overvoltage, overload, short circuit, excessive temperature, data abnormalities, 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's alarm indicator light turns red and automatically cuts off the power amplifier.
7. Rich contacts and powerful software functions
This device has eight switch inputs (A B C R a b c r) and 4 switch 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 display using 23 keys on the panel, with all interfaces displayed in Chinese. It can complete the verification work of most on-site tests. It can also conveniently complete protection device tests from foreign manufacturers such as ABB, Siemens, AREVA, etc.
The device can be placed either upright or flat, can be operated offline, or can be operated with an external PC. Test results can be automatically organized and recorded as test reports for future reference, and can also be directly saved using a USB drive and conveniently transferred to an external PC for editing, printing, and other processing. Software upgrades are simple and fast, directly via USB drive or downloaded from an external PC, without any hardware changes.
The software has powerful auxiliary calculation functions, automatically calculating 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 transformer three-phase differential tests, with very simple wiring.
8. Special design for railway use
Specially designed electric railway differential test menu, based on 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
Based on the working principle of transformer differential protection, it automatically tests the percentage braking characteristics, harmonic braking characteristics, and DC magnetizing characteristics of the transformer.
AC voltage output
0～250V continuously adjustable, output capacity 600VA, over-range protection 260V
AC current output
0～50A, 0～100A continuously adjustable
At 0～50A, open circuit voltage 10V.
At 0～100A, open circuit voltage 5V. Overload protection action current 120A.
DC voltage output
0～250V continuously adjustable, current 2A, over-range protection 260V, overload protection action current 2.1A±5%.
DC current output
0～200mA 0～5 A continuously adjustable
At 0～200mA, open circuit voltage 48V, overload protection action current 230mA.
At 0～5A, open circuit voltage 24V, overload protection action current 5.2A.
Standard 12-channel current and voltage output, flexible organization
Can output 12 channels (6 voltage, 6 current) simultaneously
Can output 6 channels of current or 6 channels of voltage separately
1. Can test various AC/DC, current, voltage, intermediate, self-holding, signal and other individual relays and complete relay protection panels. Can test the pickup voltage (current) value, release voltage (current) value, and the pickup time and release time of various contacts (normally open, normally closed, changeover, delay) of various relays. All tests are automatically performed three times and the data is stored, and the average return coefficient of the three times is automatically calculated and printed. Test results can be displayed and printed repeatedly.
2. Can conveniently test various parameters of reclosing relays.
3. Equipped with frequency and phase measurement functions, 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. Two independent channels are provided, both insulated from other outputs of the unit, allowing convenient measurement of live contacts, meeting the online testing requirements of relays, with simple and safe wiring.
5. Adopts a precise timing reference (10 microseconds) and a counter up to 100 hours, so it can be used alone as a precision millisecond meter to replace traditional stopwatches.
1. The test instrument has a built-in industrial computer and Windows operating system. Please do not turn the host power on and off too frequently.
2. The device panel or back panel is equipped with USB ports, allowing hot-plugging of USB devices (such as USB drives), but note that plugging and unplugging must be done after data transfer is completed.
3. The device is equipped with a dedicated self-restoring CF card to avoid operating system damage caused by illegal shutdown, deletion or modification of files on the hard drive and desktop icons. If you really need to store data on this machine, please store the data on the D drive. When using a USB drive to copy data, please ensure the USB drive is clean and virus-free, and do not use the USB drive to install other software programs in this system.
4. When connecting an external keyboard or mouse, do not plug into the wrong port, otherwise the Windows operating system may not start properly.
5. Do not turn off the power directly during output, to avoid protection misoperation due to incorrect output at shutdown.
6. The input channels are compatible with both dry contacts and potential (0～250VDC). When using live contacts, the high potential (positive) of the contact should be connected to the common terminal COM.
7. When using this instrument, do not block or seal the ventilation openings of the device. Generally, place the instrument upright or open the support feet to tilt it slightly.
8. It is forbidden to introduce external AC or DC power into the voltage and current output jacks of the tester. Otherwise, the tester will be damaged.
9. If the on-site interference is strong or safety requirements are high, before testing, please reliably ground the ground terminal of the power cord (3-core) or the device grounding hole.
10. If problems such as interface data errors or device connection failures occur during use, you can solve them by pressing the reset button downward to reset the DSP; or exit the running program to return to the main menu and rerun the program, then all data on the interface will be restored to default values.
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