Oil Immersed Reactor
A reactor refers to a high-voltage electrical device used by the power system to limit short-circuit current, stabilize voltage, compensate for reactive power, and phase shifting based on its inductance. According to whether there is a main iron core in its winding, it is divided into iron core reactors and air core reactors. According to the insulation medium, it can be divided into oil immersed reactors and dry-type reactors.
Structural principle:
Oil immersed reactors are mainly composed of iron cores, windings and their insulation, oil tanks, sleeves, cooling devices, and protective devices. The iron core structure of single-phase reactors is a single core column with two side columns, while the iron core structure of three-phase reactors is a cross shaped core column and coiled iron choke structure. The core column of the reactor is composed of iron core cake and air gap cushion block. The iron core cake is made of high-quality cold-rolled silicon steel sheets stacked together. The core cake adopts a radial radial radiating laminated structure, allowing magnetic flux to enter towards the silicon steel sheet side. The longitudinal preferred magnetization direction of the silicon steel sheet is selected to be parallel to the axis of the core column, in order to reduce eddy current losses caused by edge effects when magnetic lines leave and enter the core cake. Many iron core cakes are separated by polished round ceramic columns or marble circular pads, and the iron core cakes are alternately stacked with the gaps, tightened with anti magnetic screws. The electromagnetic force in the alternating magnetic field causes vibration and noise between the iron core cakes, so the clamping device of the iron core reactor is very important. Both the iron cake and iron choke should be grounded, and the iron choke and the side column should be tied with epoxy glass fiber adhesive tape.
There are anti magnetic requirements for the oil tank structure of oil immersed reactors. The model of three-phase parallel reactor is BKS type, and the model of single-phase parallel reactor is BKD type.
The function of the reactor:
The most commonly used reactors in power systems are limited current reactors, series damping reactors, and parallel reactors. Current limiting reactors are mainly used to limit the short-circuit current of busbars, and can also be used to limit the starting current of large capacity motors. Series damping reactors are mainly used to limit inrush current and operating overvoltage, and suppress high-order harmonics. Parallel reactors are mainly used to compensate for capacitance effects, regulate reactive power and voltage; Ultra high voltage shunt reactors are used to compensate for the capacitive charging current of power lines and limit the increase in system voltage. It can reduce the power frequency overvoltage and operating overvoltage of the system, playing an important role in high-voltage transmission and transformation systems, mainly including:
(1) Reduce the capacitance effect on no-load or light load lines to lower transient overvoltage at power frequency.
(2) Improve voltage distribution on long-distance transmission lines.
(3) To balance the reactive power in the line as much as possible under light load, prevent unreasonable flow of reactive power, and also reduce power loss on the line.
(4) Reduce the steady-state power frequency voltage on the high-voltage bus when the large unit is parallel to the system, in order to facilitate synchronous parallel operation of the generator.
(5) Prevent self excitation resonance phenomenon that may occur in generators with long lines.
(6) When using a small reactance grounding device for the neutral point of a reactor, a small reactor can also be used to compensate for the phase to phase and phase to ground capacitance of the line, in order to accelerate the automatic extinguishing of the secondary current and improve the success rate of the line's automatic reclosing.
Product Standard:
GB/T 1094.6-2011 IEC 60076-6：2007
GB/T 1094.1-2011 IEC 60076-1：2011
GB/T 1094.3-2017 IEC 60076-3：2013
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