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Fault Analysis and Treatment of High Voltage Shunt Reactors

Source:www.powerel-china.com     Time:2014-5-13    hits:532
The basic structure and form of a shunt reactor
Reactors currently used mainly in shell-and- core type reactor and reactor 2 forms . Reactors currently in use are the province core type reactor, and domestic production of high-voltage large -capacity reactor core structure is based. In the arrangement, the single phase is divided into three phases and , in general , the consumption of raw materials and the cost is less than a three-phase single-phase , therefore , the low voltage level of three-phase reactors generally use form . High voltage reactor interrelated because in the three-phase magnetic circuit forms , may be smaller than the zero sequence impedance of some positive-sequence impedance . Single-phase reclosing disconnect phase flux after addition of the two phases is disconnected by the core part , thereby disconnecting the coil induces a voltage in phase , so that the fault current is increased , is not conducive to arc , so the insulation requirements, insulation problems phases is relatively prominent, so 500 kV or more reactors in most cases, a single-phase structure.

Common faults and determine two reactors
Typically , the reactor having the same except for the insulation of the transformer , there also exists the problem of local overheating and vibration . Domestic products, Xi'an Transformer Factory ALSTHOM technology imported from France , after digestion and absorption , and with the help of Xi'an Jiaotong University and other tertiary institutions , the overheating problem has been basically solved . Shenyang Transformer Factory due to the beginning of the manufacturing 500 kV reactors, does not yet have a mature operating experience . In recent years, more than 220 kV reactors and accidents and failures found in the provinces basically divided into the following categories:
2.1 Oil abnormal chromatographic analysis
Conducted through the reactor oil chromatographic analysis , found many early failures and accidents , the prevention of reactor accidents played an important role . Causes the oil to produce gas for local overheating ( core , winding , wire junction point , clamps , etc. ) , partial discharge and arc ( such as inter-turn short circuit parts and layers , surface discharge and magnetic closed circuit , etc. ) . These phenomena can cause cracking of the oil and solid insulation , thereby generating gas . Gases mainly hydrocarbon gases ( methane, ethane , ethylene, acetylene , etc. ) , hydrogen , carbon monoxide , carbon dioxide, and the like. Application of gas chromatography to determine the reactor internal failure follows.
2.1.1 The results of the chromatographic analysis of several key indicators were compared with normal values , to judge by the gas production rate , when the higher total hydrocarbon content , when the relative gas production rate greater than 10 % per month can be judged as reactance internal abnormal ; when the absolute total hydrocarbon gas production rate is greater than 0.25mL / h ( open ) and 0.5 mL / h ( sealed ) , the reactor can determine the existence of a fault ;
2.1.2 monoxide and carbon dioxide indicators for judgment. CO and CO2 are characterized by gas generated by the decomposition reflect fiber insulation , but two large dispersion index . Thus , according to the IEC guidelines and other information that: When CO2/CO greater than 11 or less than 3, there may be an internal malfunction solid insulating material aging , domestic information and experience deems CO2/CO greater than 2, then there could be exceptions.


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