Method for inhibiting ferroresonance
A technology of ferromagnetic resonance and analysis method, which is applied in the direction of preventing/reducing unnecessary electric/magnetic influence, electrical component structure association, transformer, etc., and can solve power system accidents such as burning coils, voltage transformer VT damage, and excitation current Major problems, to achieve the effect of eliminating potential safety hazards, avoiding heat damage failures and equipment damage accidents
Active Publication Date: 2012-08-22
HENAN PINGZHI HIGH VOLTAGE SWITCHGEAR
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Problems solved by technology
When ferromagnetic resonance occurs, the overvoltage amplitude of the voltage transformer VT is generally not high, but the excitation current is often very large, which may reach hundreds or even thousands of times of the normal current. If the time is too long, the coil will be burned, and even the voltage transformer will be damaged. Damage of VT and Induced More Serious Power System Accidents
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Embodiment Construction
[0022] The present invention conducts theoretical analysis, simulation analysis and practical verification on the process of ferromagnetic resonance generation, combines the actual parameters of GIS power station engineering, and utilizes EMTP (Electromagnetic Transient Program, which is a simulation software for electromagnetic transient analysis of power systems) to analyze Methods Infer the range and special working conditions of the voltage transformer VT ferromagnetic resonance and determine the parameters of the saturable reactor, and install the saturable reactor on the secondary side of the voltage transformer VT to suppress the ferromagnetic resonance Purpose.
[0023] Analysis of the phenomenon of ferromagnetic resonance: such as figure 2 Shown is the equivalent circuit of ferromagnetic resonance, where R is the primary coil resistance of the voltage transformer VT, L is the inductance of the voltage transformer, E is the power supply voltage, C1 is the fracture cap...
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The invention discloses a method for inhibiting ferroresonance. The method comprises the following steps of: (1) inferring the occurrence range and working condition of the ferroresonance of a voltage transformer by an EMTP analytical method: the smaller the capacitor of a GIS bus over the ground, the bigger the probability of the ferroresonance, wherein the working condition is intra-string T zone of 3 / 2 wiring or 4 / 3 wiring, at this time a circuit breaker is in a separating brake state, the capacitor of the bus over the ground is small, and an intra-string voltage mutual inductor will have the ferroresonance; (2) determining the excitation characteristic and coil internal resistance parameter of a saturable reactor; and (3) connecting the two connecting terminals of the saturable reactor which meets parameter condition with a secondary winding of the voltage transformer. The method can avoid VT heating damage and equipment damage accident due to the ferroresonance in a GIS power station effectively, eliminates the potential safety hazard of the possible ferroresonance in a power network system, and plays an important role in guaranteeing the safe operation of the power network; and therefore important social and economic benefits are generated.
Description
technical field [0001] The invention relates to the field of GIS substations, in particular to a method capable of suppressing ferromagnetic resonance caused by electromagnetic voltage transformers. Background technique [0002] At present, with a large number of power grid transformation and expansion projects across the country, the distribution network structure as low as 10kV and as high as 500kV has undergone major changes, which makes the entire power grid more flexible and strong. However, due to the complexity of the power grid structure, the ferromagnetic resonance phenomenon that rarely occurred in the power grid before now occurs from time to time. Especially in the current 550kV GIS (metal-enclosed switchgear), shunt capacitors are generally arranged between the breaker breakers to improve the breaker voltage distribution characteristics. The device may generate a continuous low-frequency voltage (ie, ferromagnetic resonance phenomenon). The main factor of ferr...
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IPC IPC(8): H01F38/24H01F27/34H01F27/40
Inventor 苏戈王赛豪张书琴
Owner HENAN PINGZHI HIGH VOLTAGE SWITCHGEAR