Intelligent trend of transformer on-load voltage regulation technology

Smart grid is the future development direction of the power grid, which requires the intelligent development of equipment to adapt. As one of the core working parts of power transformers, on-load tap-changers have developed fast on-line monitoring and intelligent control technology. The intelligent development of transformer on-load voltage regulation technology represents the latest direction of the domestic intelligent voltage regulation field.

The construction staff of Fujian Shaowu Power Supply Bureau replaced the transformer and increased the capacity.

In China, transformer on-load voltage regulation technology is widely used in power distribution systems, and is also used in booster transformers in power plants. At present, the large-scale power transformers newly added to the power system all use on-load voltage regulators, and are equipped with a complete low-voltage distribution network structure and sufficient reactive power compensation capacity to enable the safe operation of the power grid and meet customer requirements for power quality.

The on-load voltage-regulating transformer plays an important role in the power system. It can not only stabilize the load center voltage, but also be an indispensable important equipment for connecting the power grid, adjusting the load flow, and improving reactive power distribution. The basic principle is that a number of taps are drawn from the coil on one side of the transformer. Through the on-load tap-changer, without cutting off the load current, one tap is switched to another tap to change the effective number of turns. To achieve the purpose of regulating voltage.

Problem negative voltage regulation reduces system stability

Due to historical reasons, transformers in some 110kV substations at county and county levels in China mostly use non-excited voltage regulating transformers. There are several disadvantages of using a non-excited voltage regulating transformer. First, it requires a certain amount of power outage time for adjustment, which interferes with normal production and affects normal power supply. Second, the number of adjustments is limited, and it can only be adjusted periodically or seasonally It can be carried out at any time, and the ability to deal with the voltage fluctuations caused by the daily peaks and valleys of the power is limited. Third, the non-excited tap-changer is often operated, and the seals are easily damaged to cause oil leakage. At this stage, the more feasible method is to transform the transformer to achieve on-load voltage regulation.

According to statistics, if a load-regulated transformer is replaced or modified, when the reactive load is reasonably adjusted, a considerable amount of reactive equipment can be added. Therefore, it can be said that the on-load voltage regulating transformer is not only the key equipment to guarantee the power supply quality of modern power system, but also can be used to transform the old power system, resulting in great economic benefits.

However, in recent years, some abnormal conditions have occurred in the on-load tap-changer. The traditional on-load voltage-regulating transformer uses a mechanical voltage-regulating tap-changer. There are many problems, such as arc generation, slow operation speed, inconvenient maintenance, and high failure rate.

On-load voltage regulation should be dynamically adjusted according to the actual operating state of the power system to avoid voltage regulation under fault. The research shows that the on-load voltage-regulating transformer acts when the system has a large disturbance, which will cause the system to be overloaded, which will produce a negative voltage regulation effect and reduce the stability of the system. Therefore, how to diagnose the failure of the system in time and ensure that the on-load tap changer can operate and block correctly is also a problem urgently needed to be solved in the current new on-load voltage transformer.

Trend control system intelligence is the key

At present, vacuum on-load tap-changer is the main product of transformer on-load voltage regulation. In the future, intelligent development is undoubtedly a breakthrough in control. Need to have an intelligent control system, including computer remote control, automatic voltage regulation, parallel function, various signal output, etc.

Now, the electric operating mechanism of the new on-load tap-changer adopts non-contact high-precision giant magnetic technology sensor instead of the traditional signal generator, which overcomes the shortcomings of the traditional signal generator such as easy deformation, oxidation and wear. The signal transmission matching this can be completed through optical fiber and network, especially optical fiber transmission, because it has no power supply and signal attenuation, and is not affected by the transmission distance, the wiring is reliable and simple; the data is transmitted by optical signal, and it is resistant to electromagnetic interference strong ability.

At the same time, the new electric mechanism now adopts modular design, building block construction, and new in-line terminal technology, which makes the wiring and disconnection of the cable quite easy. It is suitable for the transformation and upgrade of similar tap changer electric mechanisms. The on-load tap-changer transformation provides a completely new solution.

Make full use of advanced electronic technology, integrate all the functional requirements into one, first of all improve the economic efficiency, there will be no more controllers to meet various functions; electronic product design is easy to change, the designer can according to the actual Demand modification procedures and control methods, its universal, reliable and intelligent features, will meet the needs of the intelligent development of the power grid to the greatest extent.

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