Jiangsu Xibo Electric Technology Co., Ltd. is located in Yixing City, which is known as the hometown of cables. Our company aims to serve all kinds of wire and cable enterprises. On the basis of introducing, digesting and absorbing foreign advanced technology, we cooperate with relevant national standards for wire and cable. The promulgation and revision, combined with long-term testing and manufacturing experience, completely introduced, developed, manufactured and produced the electrical type test system for 35kV and below coiled power cables, including no partial discharge power frequency resonance test system, multi-circuit and multi-circuit below 8000 amps Magnetic circuit high-precision automatic circulation heating system and other professional testing and testing devices, with a number of national patents
Among them, the power frequency non-partial discharge resonance test system and the fault location test system are the most advanced and mature products in China, which have passed the national appraisal, are batched and always remain the industry's first choice of ultra-stable products. Partial discharge test of cross-linked power cables and accessories of 132, 220, 500kV voltage levels, and passed the national appraisal.
According to the current IEC standard, Jiangsu Xibo Electric Technology Co., Ltd. manufactures the entire system according to the basic standard with a sensitivity better than 2pC, which is far higher than the national sensitivity requirement of 10pC, and the background interference of the whole system can be less than 1.5pC (with 200m The above load, the partial discharge instrument is not allowed to open the window), that is, the test sensitivity of the system is better than 2pC, and according to the technical service level of Jiangsu Xibo Electric Technology Co., Ltd., such sensitivity can be maintained for more than 10 years. Wave can ensure that the entire system successfully passes the national appraisal at one time.
(1) The background harmonic at the connection point of the capacitor device is 3rd (when the background harmonic at the connection to the power grid is 3rd and above, it is generally 12%; 4.5% to 6% and 12% can also be used. reactance rate.)
The choice of reactance ratio also depends on the harmonic background:
1 The background harmonic at the access point of the capacitor device is the 3rd order
1) If the third harmonic content is small, a series reactor of 0.1% to 1% can be selected, but it should be checked whether the third harmonic amplification exceeds or is close to the national standard limit after the capacitor device is put into use, and there is a certain margin.
1. Incoming line reactor
Also known as input reactor or power supply coordination reactor, it can limit the current impact caused by grid voltage mutation and operating overvoltage, and effectively protect the inverter; it can not only prevent the interference from the grid, but also reduce the harmonic generated by the rectifier unit. The wave current pollutes the power grid and improves its power factor.