04,28,2026 80 views
Microcomputer relay protection testerThe main characteristics of
Microcomputer relay protection testerIt is a new type of intelligent testing instrument. Previously, relay protection testing tools were mainly composed of voltage regulators and phase shifters, which were bulky and had low accuracy, and could no longer meet the calibration work of modern microcomputer relay protection. With the continuous development of science and technology, microcomputer relay protection has been widely used in various fields such as line protection, main transformer differential protection, excitation control, etc. The comprehensive automation of substations has become mainstream.
Modern microcomputer relay protection testers can be divided into two forms. One is to use traditional ICL power amplifiers, which are bulky and weigh around 25Kg. The amplifier tubes work in the amplification area and are prone to damage over time. Additionally, the dynamic range is narrow and the accuracy is not high. Another approach is to use switch mode power supplies, with digital amplifiers as power amplifiers, which are small in size, light in weight, and highly efficient. This is the development direction of relay protection testers. It can manually or automatically test various types of voltage, current, frequency, power, impedance, harmonic, differential, synchronous and other relays. It can simulate various fault types for distance and zero sequence protection device calibration and protection device group testing. It can automatically scan the differential protection ratio braking curve of microcomputer and digital transformers and generator sets, and has GPS triggering function.
The microcomputer relay protection testing system produced by Defu (such as DF-702, DF802, DF1200) is a new type of miniaturized microcomputer relay protection tester based on the reference to DL/T624-1997 "Technical Conditions for Microcomputer Relay Protection Test Devices" issued by the Ministry of Electric Power, extensive listening to user opinions, summarizing the advantages and disadvantages of similar products in China, and fully utilizing modern microelectronics technology and devices. It adopts a standalone independent operation and can also be connected to a laptop for operation. The host adopts DSP+FPGA structure, true 16 bit DAC output, built-in new modular high fidelity linear high-power amplifier, built-in 8.4-inch TFT true color display screen with a resolution of 800 × 600, and industrial keyboard and mouse. The Windows XP operating system is powerful. Small size and high precision. It has the performance and functions of a large testing instrument, as well as the advantages of a small and flexible testing instrument, easy operation, and high reliability, with a high cost performance ratio. It is a handy tool for relay protection workers.
The WKJBC-II single machine relay protection calibrator produced by Defu is a new generation calibration device successfully developed by our company. The internal AC/DC voltage and current sources of the instrument adopt power technology, which enables the instrument to reach the highest level in circuit design, device selection, panel layout, and internal structure design. This instrument has the advantages of complete functions, excellent material selection, clear test project data, and simple operation, and is the preferred equipment for power relay protection departments.
The DF1200 fully automatic relay protection calibrator produced by Defu is a newly developed highly intelligent and multifunctional relay protection calibrator based on the original JBC. This instrument adopts single-chip microcomputer technology and consists of an automatic synchronous digital millisecond meter, logic control unit, multifunctional digital display unit, high-precision data acquisition and processing unit, current and voltage output unit, overload and over range protection unit, etc. It comes with printing and display, and the testing process is fully automatic, greatly improving measurement accuracy and work efficiency. This instrument also has the advantages of beautiful appearance, reliable performance, easy operation, and comprehensive functions, making it an ideal instrument for verifying relay protection devices.
IIMicrocomputer relay protection testerThe usage environment is mainly divided into three aspects:
1. In terms of hardware requirements, the PC configuration requirements are not very high, at least Pentium 200 or above, 32M memory, display resolution of 800 × 600 or above, and a laptop or desktop computer that can run the Windows 98 operating system.
2. In terms of hardware connection, it is necessary to turn off the power of the PC and use a 9-core communication cable to connect the PC serial port 1 to the PC communicator on the back panel of the tester. Then turn on the tester and PC power. And select the "PC" menu on the offline software main menu of the tester to enter the PC communication state.
3. In terms of software operation, start the PC, run the current operating system, set the display resolution to 800 × 600, open the target folder on the desktop, and enter the various sub function menus to conduct various experiments.
IIIMicrocomputer relay protection testerUSB communication troubleshooting method
The microcomputer relay protection tester uses high-speed USB2.0 protocol for test communication, and the USB connection must be confirmed to be normal before conducting the test. If the status bar of the experimental software interface always displays' Device not connected ', the following steps can be taken to troubleshoot:
1. The microcomputer relay protection tester confirms whether the USB control switch selection on the instrument panel is correct.
The selection of USB control switch depends on the different testing methods. If the test is conducted by connecting the built-in industrial computer, select the "industrial computer" end of the USB control switch; If you are connecting an external computer for testing, please select the "PC" end.
When connecting an external computer, please confirm whether the industrial computer driver is installed. For detailed instructions, please refer to Appendix A.
Recheck the status bar display on the test software interface. If it still shows' Device not connected ', proceed to the next step.
2. Try pressing the 'Reset' button on the instrument interface.
Wait for 5 seconds and check the status bar on the test software interface. If it still shows' Device not connected ', proceed to the next step.
3. Shut down the system normally, turn off the power, and wait for a few minutes before turning it back on.
4Microcomputer relay protection testerPurpose of use
Microcomputer based relay protection testing device is an important testing tool for ensuring the safe and reliable operation of power systems. With the rapid development of computer technology, microelectronics technology, and power electronics technology, the continuous introduction of new high-performance microcomputer relay protection testing devices based on applied technological achievements is an inevitable trend of technological progress. Relay protection testing device is an important testing tool for ensuring the safe and reliable operation of power systems. With the continuous expansion of modern power systems and the increasing demand for reliability and reliability in power system operation and management, the testing work of relay protection personnel has become more frequent and complex. In today's rapidly developing computer technology, microelectronics technology, and power electronics technology, the continuous introduction of new high-performance relay protection testers based on technological achievements is an inevitable trend of technological progress and a responsibility entrusted to us by the times.
5Microcomputer relay protection testerIt has the following wide applications:
1. Testing of all individual components in secondary scheduling, including current, voltage, time, differential, balance, negative sequence, distance, power direction, inverse time limit, frequency, synchronization, reclosing, and other relays.
2. The entire transmission system can simulate various simple or complex transient, transient, and conversion faults, and can superimpose transient DC components on the fundamental wave.
3. It can stack various harmonics freely, and the initial angle and content of superposition can be controlled online.
4. It can output different frequency AC and DC currents in separate phases.
5. Low cycle unit, convenient for testing microcomputer low cycle low voltage load shedding protection.
6. Automatic scanning of various protection time characteristics. Scanning of power and impedance protection characteristic curves.
7. Automatic testing of differential ratio and harmonic braking characteristics of microcomputer main transformer protection.
8. Automatic testing of distance, zero sequence, and overcurrent protection for the entire group.
9. User programmable testing unit to meet special testing purposes, such as testing of automatic switching devices.
10. Testing of various protections such as motor demagnetization, demagnetization, reverse power, and synchronization.
