A Method for Leveling the Unbalance of H-type Connection Capacitor Bank
A capacitor and capacitor bank technology, 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 capacitor bank unbalance protection, poor effect, and immediate action tripping and other problems to achieve high efficiency
Active Publication Date: 2020-09-25
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 H-type connection (also called bridge difference 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 DC transmission project, including the capacitor bridge arm C1, the capacitor bridge arm C2, and the capacitor bridge arm C3 And capacitor bridge arm C4, each capacitor bridge arm is composed of multiple capacitor units connected in series and parallel, wherein the structure of C1 and C2 bridge arms is 20 series and 2 parallel (such as figure 2 shown), the structure of C3 and C4 bridge arms is 18 strings and 2 parallels. The unbalanced current transformer IT2 is connected to ...
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The invention discloses a leveling method for unbalance degree of H-type wiring capacitor bank, which comprises the following steps: determining parameters of 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 comparing withthe 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 operation afterleveling, and has high operation efficiency.
Description
technical field [0001] The invention relates to the technical field of power transmission and transformation engineering equipment maintenance, in particular to a method for leveling the unbalance degree of an H-type wiring capacitor bank. Background technique [0002] At present, most high-voltage capacitor banks use H-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 hig...
Claims
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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