An unbalance degree leveling method for a U-shaped connection capacitor bank
A capacitor bank and balance technology, which is applied in the direction of AC network voltage adjustment, multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, etc., can solve the problem of unbalanced protection of capacitor banks, poor effect, and immediate action Tripping and other problems, to achieve the effect of high efficiency
Active Publication Date: 2018-12-11
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology
However, according to the existing method of leveling, the effect is not good. There was an event that the unbalance protection tripped immediately after the capacitor bank was put into use.
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[0022] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] figure 1 It is a structural schematic diagram of the Π-type connection (also called branch connection) capacitor bank of the present invention, which is used as a high-voltage capacitor bank of the AC filter of the converter station of the direct current transmission project, including the capacitor bridge arm C1 and the capacitor bridge arm C2, each capacitor bridge arm All are composed of a plurality of capacitor units connected in series and in parallel. In this embodiment, the structures of the bridge arms of C1 and C2 are 20 in series and 2 in parallel (such as figure 2 shown). A first current transformer IT1 is connected below the capacitor bridge arm C1, a second current transformer IT2 is connected below the capac...
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The invention discloses an unbalance degree leveling method for a U-shaped connection capacitor bank, comprising the following steps: determining parameters of the capacitor bank, leveling standard and unbalance degree; Disconnect the capacitor bank from the high voltage bus; Applying AC voltage to the capacitor bank, observing the unbalance degree generated by the protection device and comparingwith the unbalance degree leveling standard; If the unbalance degree generated by the protection device meets the leveling standard, the work is finished; If not, measuring the capacitance value of the capacitor unit in the bridge arm of the capacitor bank and the bridge arm of the capacitor bank, and replacing the capacitor unit with large deviation of the capacitance value; The capacitor cells are sorted according to the capacitance value, and the positions of the capacitor cells on different bridge arms are exchanged several times according to the leveling target, so as to level the unbalance degree to the set value. The invention can reflect the unbalanced state of the capacitor bank essentially, can avoid the unbalanced protection action after the capacitor bank is put into operationafter leveling, and has high operation efficiency.
Description
technical field [0001] The invention relates to the technical field of maintenance of power transmission and transformation engineering equipment, in particular to a method for leveling the unbalance degree of a Π-type wiring capacitor bank. Background technique [0002] At present, most high-voltage capacitor banks use Π-type wiring, and the main protection is unbalanced protection. The unbalanced protection uses the unbalanced current divided by the sum current to obtain the unbalanced degree. When the unbalance degree is small, the internal fault degree of the capacitor bank is relatively light, and the alarm outlet is protected; when the unbalance degree is large, the internal fault degree of the capacitor bank is serious, and the trip outlet is protected. There are many capacitor units connected in series and parallel in the capacitor bank, and the setting value of the unbalance protection alarm section is set to a certain fault condition inside a capacitor unit, with h...
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IPC IPC(8): H02J3/26H02J3/16
CPCH02J3/16H02J3/26Y02E40/30Y02E40/50
Inventor 郑伟黄义隆
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID