Relay protection is a safety guarantee measure in the power system, which can timely and accurately identify faults in the power system and protect various parts of the power system from losses. The three-phase relay protection tester is a type of equipment used to test relay protection equipment.
1. Working principle
The three-phase relay protection tester is a device used for testing and debugging relay protection equipment, mainly used to detect whether the relay protection equipment is working properly. During testing, the three-phase relay protection tester will simulate faults in the power system to detect the operation and protection range of the protection equipment. At the same time, the parameters of relay protection equipment can also be adjusted to better adapt to the actual usage environment.
Specifically, the working principle is as follows:
① Signal generator: There is a signal generator in the tester that is used to generate various electrical signals. These signals can simulate voltage, current, phase, etc. separately.
② Input part: The input part includes the input to the electrical appliance and the input to the signal generator. The input to the electrical appliance is to connect the electrical appliance to be tested to the tester, and the input to the signal generator is to input the signal input interface to the equipment to be tested through the tester.
③ Control part: The control part is the core part of the three-phase relay protection tester, with high-precision and high-speed mathematical and logical operation capabilities.
④ Output section: The output section is used to record and display test results, which can output digital images and data for engineers to evaluate and analyze.
2. Test object
The three-phase relay protection tester is mainly used to test various relay protection equipment, including voltage relays, current relays, differential relays, undervoltage relays, overvoltage relays, reverse relays, etc. The three-phase relay protection tester can test important indicators of equipment such as pulse protection, short-circuit prevention, ground fault network protection, reverse protection, zero sequence protection, etc., to ensure that the equipment can accurately and quickly operate in the event of a fault. It can be seen that testers are widely used, including maintenance and debugging in laboratories, power companies, maintenance of power generation equipment, and manufacturing of electrical equipment in multiple fields.
3. Usage method
① Parameter adjustment: Before testing, some parameter adjustments need to be made first. For example, we need to connect the output signal of the three-phase relay protection tester to the testing equipment and adjust the signal size to the optimal state to ensure that the equipment can accurately test. In addition, we also need to set the working mode of the tester to manual or automatic mode, and choose different testing scenarios according to the actual situation.
② Testing steps: The testing steps of the three-phase relay protection tester mainly include: detecting and calibrating the start and action time of the three-phase relay, detecting the sensitivity and protection range of the relay protection equipment, simulating fault events by simulating voltage, current and other fault types, and testing the action time of the equipment.
③ Test result analysis: After the test is completed, we need to analyze the test results. If the test results meet the requirements, we can seal the equipment for future use. If the test results do not meet the requirements, troubleshooting and repair are necessary.
4. Purchasing and Maintenance
① Purchasing: Before purchasing, it is necessary to consider factors such as the working frequency, accuracy, testing saturation, testing time, testing method, and professionalism of the tester. At the same time, we also need to choose a legitimate manufacturer with good after-sales support and maintenance, and pay attention to whether there is a national quality certification, as well as whether there is a comprehensive use and maintenance manual.
② Daily maintenance: Daily maintenance can ensure the long-term use of the tester. To ensure a dry and suitable storage environment for the equipment, clean the testing equipment before use, and use appropriate tools for regular and daily maintenance.
The three-phase relay protection tester plays an irreplaceable role in the power system, which can not only improve the safety and reliability of the power system, but also achieve multiple goals such as energy conservation and emission reduction. When using and purchasing, we need to consider various factors to ensure the long-term performance and effectiveness of the tester.
ZCAR-702 three-phase relay protection tester is a new type of miniaturized microcomputer relay protection tester, which is based on the "Technical Conditions for Microcomputer-based Relay Protection Test Devices (Discussion Draft)" issued by the Ministry of Electric Power, summarizes the advantages and disadvantages of similar domestic products, and fully utilizes modern advanced microelectronics technology and devices to achieve. The instrument operates independently on a single machine, with strong functionality, small size, and high accuracy. It not only has the superior performance and advanced functions of large testers, but also has the advantages of small and flexible testers, simple operation, high reliability, and high cost-effectiveness. It is a handy tool for relay protection workers. In addition to verifying various relays (such as current, voltage, inverse time, power direction, impedance, differential, low cycle, synchronization, frequency, DC, intermediate, time, etc.) and microcomputer protection, it can also simulate transient and conversion faults from single-phase to three-phase for whole group testing. It can also complete various large-scale and complex verification tasks with high degree of automation, automatically test and scan various protection settings, store test data in real-time, display vector maps, print reports online, and so on.
Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase.
