As the most important energy industry in China, China's electric power industry has always been in a priority position for development. The development of electric power enterprises is also remarkable, and the development of related electric power products has always been concerned. Now the latest generation of microcomputer relay protection tester is now widely used in line protection, main variable differential protection, excitation control and other fields. Relay protection tester is an important testing tool to ensure the safe and stable operation of the power system, so how to maintain the relay protection tester is particularly important. The following is a detailed description and introduction of several attention measures for the safe operation of the microcomputer relay protection tester:
(1) problems needing attention in the inspection of relay protection devices
In the relay protection device inspection process must pay attention to the whole group of tests and current loop current test in the final test, the completion of these two work, need to pay attention to is: is prohibited to pull plug, change the value, change the value area, change the secondary circuit wiring and other work network. Current loop boost and voltage loop boost tests must also be performed last after other test items have been completed. In the periodic inspection, the equipment often enters the hot spare state after the inspection is completed, or the equipment is put into operation and has no load temporarily. In this case, it is not possible to measure the load vector and print the load sampling value.
(2) The problem of fixed value area
One of the advantages of microcomputer relay protection device is that it can set more than one fixed value area, which greatly facilitates the problem of changing the fixed value when the operation mode of power network changes. However, it must be noted that the error of the fixed value area is a taboo for relay protection work, and strict management and corresponding technical means must be used to ensure the correctness of the fixed value area. The measures taken are that, after modifying the fixed value, we must print the fixed value sheet and the fixed value area code, pay attention to the date, substation and the name of the modified personnel and equipment, and focus on the relay protection work record to indicate the fixed value number, to avoid the error of the fixed value area.
(3) General examination
No matter what protection, general inspection is very important, but it is also a neglected item in the field, should be done carefully. General inspection generally includes the following two aspects: first check whether the connecting piece fastening welding point virtual welding mechanical characteristics. Now after the protection screen terminal row terminal screw is very many, especially after transportation and handling of the newly installed protection screen, most of the screws have become loose, after the site is in place, we must be serious about a leakage to tighten again, otherwise it is the protection refuse to move, the hidden danger of misoperation. Secondly, pull out all the plugins of the device and check again, press all the chips tightly, tighten the screws and check the virtual solder joints. In the inspection, the screw fastening of each component protection screen, control screen and terminal box must be implemented as an important work.
(4) Grounding
Grounding problem in relay protection work is very prominent, roughly divided into the following two points: first of all, the protection screen of the device chassis barrier grounding problem, must be connected to the screen on the copper bar, general manufacturers have done a good job, just carefully check. The most important thing is that if the copper bar in the protection screen can be reliably connected to the ground network, a large section of copper whip or wire should be reliably fastened to the ground network, and whether the resistance meets the requirements of the regulations should be measured with an insulation meter.
(5) Need to develop work record and inspection habits
Work records must be serious, detailed, truly reflect some important links of the work, such work records should be said to be a technical file, for the future work can play a guiding role. The work record of relay protection device should be in addition to the content defined by the regulations, carefully record every detail of work, processing method. Work carefully check it again after the completion of the contact device is a good habit, it will often find some defects in the work, can to record on a regular basis, this paper summarizes the problems in the formation of the corresponding treatment scheme, which for each relay protection workers should develop a good working habits, This good habit is very good for the maintenance of relay protection devices.
