CN103605392A - Method for adjusting H-type bridge differential protection initial unbalance degree of capacitor bank - Google Patents
Method for adjusting H-type bridge differential protection initial unbalance degree of capacitor bank Download PDFInfo
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- CN103605392A CN103605392A CN201310512016.6A CN201310512016A CN103605392A CN 103605392 A CN103605392 A CN 103605392A CN 201310512016 A CN201310512016 A CN 201310512016A CN 103605392 A CN103605392 A CN 103605392A
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Abstract
A method for adjusting H-type bridge differential protection initial unbalance degree of a capacitor bank comprises the following steps of S1, selecting a group of symmetric bridge arms, wherein two ends of one of the bridge arms are connected with an intelligent capacitance regulator; S2, setting a bridge differential unbalance current threshold value for the intelligent capacitance regulator; S3, starting the intelligent capacitance regulator and regulating output capacitance of the intelligent capacitance regulator till bridge differential unbalance currents of the symmetric bridge arms are smaller than the set bridge differential unbalance current threshold value; S4, confirming actual regulated capacitance according to final output capacitance of the intelligent capacitance regulator, selecting a capacitor required to be replaced in the symmetric bridge arms and replacing the capacitor, wherein the step S4 includes the steps of S41, judging whether the output capacitance of the intelligent capacitance regulator is 0 or not; S42, confirming that no replacement is required in the symmetric bridge arms if a judgment result is yes, confirming that the actual regulated capacitance if the judgment result is no, selecting the capacitor required to be replaced in the symmetric bridge arms and performing replacement.
Description
Technical field
The present invention relates to a kind of capacitor group initial unbalance degree control method, particularly a kind of high pressure AC/DC Filters capacitor group H type Bridge differential current protection initial unbalance degree control method.
Background technology
At present, high-voltage alternating, DC filter capacitor group generally adopt H type Bridge differential current protection, and as shown in Figure 1, electric bridge has four brachium pontis: brachium pontis 1, brachium pontis 2, brachium pontis 3, brachium pontis 4.When bridge balance, diagonal line no current, no-voltage are poor, on the contrary, when unstable, can produce out-of-balance current, unbalance voltage.With the protection of measuring this out-of-balance current or voltage formation, be exactly the protection of bridge spill current and the protection of bridge potential difference.
Capacitor needs to carry out the adjusting of initial unbalance degree before putting into operation, existing capacitance adjustment mode is to detect the poor out-of-balance current value of bridge with reometer, adopt method of trial and error, some capacitors by artificial transposing brachium pontis regulate, make the poor out-of-balance current of bridge that reometer detects approach zero, this mode complicated operation, regulating cycle is long.
Summary of the invention
The present invention is directed to prior art above shortcomings; a kind of capacitor group H type Bridge differential current protection initial unbalance degree control method is provided; to solve current high pressure AC/DC Filters capacitor group complicated operation, the long problem of regulating cycle when initial unbalance degree regulates, reach the object of selecting fast the capacitor that needs replacing.
The present invention is achieved through the following technical solutions:
A capacitor group H type Bridge differential current protection initial unbalance degree control method, capacitor group is comprised of some brachium pontis, comprises the following steps:
S1, select one group of symmetrical brachium pontis, brachium pontis two ends therein connect an intelligent capacitor regulator;
S2, the threshold value of the poor out-of-balance current of a bridge is set on intelligent capacitor regulator;
S3, startup intelligent capacitor regulator, the output capacitance of adjusting intelligent capacitor regulator, until organize the threshold value that the poor out-of-balance current of the bridge of symmetrical brachium pontis is less than the poor out-of-balance current of bridge of setting;
S4, according to the final output capacitance value of intelligent capacitor regulator, determine practical adjustments electric capacity, select to need in symmetrical brachium pontis the capacitor of changing to change;
Wherein, step S4 comprises:
S41, judge whether the output capacitance of intelligent capacitor regulator is 0;
S42, if the determination result is YES, organizes symmetrical brachium pontis and does not need to change unit;
If the determination result is NO, definite practical adjustments electric capacity, and selection is organized in symmetrical brachium pontis needs the unit of replacing to change.
Preferably, step S3 comprises:
S31, under original state, the output capacitance of intelligent capacitor regulator is 0, the poor out-of-balance current value of initial bridge of the symmetrical brachium pontis of the first test set of intelligent capacitor regulator;
S32, judge whether the poor out-of-balance current value of initial bridge is less than the threshold value of the poor out-of-balance current of bridge;
S33, if the determination result is YES, performs step S4;
If the determination result is NO, the grade of the output capacitance of intelligent capacitor regulator adds 1, and whether the output capacitance of the intelligent capacitor regulator after judgement adjusting is less than or equal to the maximum output capacitance of intelligent capacitor regulator;
If the determination result is NO for S34, return to step S1;
If the determination result is YES, return to step S31.
Preferably, in step S42, if the output capacitance of intelligent capacitor regulator is greater than 0, practical adjustments electric capacity equal intelligent capacitor regulator output capacitance 1/2nd.
Accompanying drawing explanation
Shown in Fig. 1 is the structural representation of H type bridge;
Shown in Fig. 2 is operational flowchart of the present invention;
Shown in Fig. 3 is wiring schematic diagram of the present invention.
Embodiment
Below with reference to accompanying drawing of the present invention; technical scheme in the embodiment of the present invention is carried out to clear, complete description and discussion; obviously; as described herein is only a part of example of the present invention; it is not whole examples; embodiment based in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, belongs to protection scope of the present invention.
For the ease of the understanding to the embodiment of the present invention, below in conjunction with accompanying drawing, take specific embodiment and be further explained as example, and each embodiment does not form the restriction to the embodiment of the present invention.
Please refer to Fig. 2 and Fig. 3, a kind of capacitor group H type Bridge differential current protection initial unbalance degree control method that the present embodiment provides:
S1: as Fig. 2, select one group of symmetrical brachium pontis 3 and brachium pontis 4, by the electric capacity output terminal of the intelligent capacitor regulator 5 brachium pontis two ends (take brachium pontis 3 here as example) of accessing one of them in parallel, A is the current detection circuit of intelligent capacitor regulator, for detection of the poor out-of-balance current of bridge.
S2: the threshold values of the poor out-of-balance current of bridge is set by the keyboard of intelligent capacitor regulator, and microprocessor is stored in described threshold values in ROM storer, and is shown on display screen.
S3: after intelligent capacitor regulator starts, start to carry out the output capacitance that automated capacitive regulates intelligent capacitor regulator, until the poor out-of-balance current of bridge is less than threshold values.
S31: during beginning, the output capacitance of intelligent capacitor regulator is 0, and intelligent capacitor regulator first detects the initial unbalance current value of high pressure AC and DC filter capacitor group.
S32: if the initial unbalance current value detecting is greater than threshold values, starts automatically to start preset adjusting program and regulate, the output capacitance grade of controlling intelligent capacitor regulator adds 1.
S33: if the output capacitance of the intelligent capacitor regulator after regulating is less than or equal to the maximum output capacitance of intelligent capacitor regulator, repeating step S31.
S34: if the output capacitance of the intelligent capacitor regulator after regulating is greater than the maximum output capacitance of intelligent capacitor regulator, repeating step S1.
S4: determine practical adjustments electric capacity according to the final output capacitance of intelligent capacitor regulator, module of selection is changed.
S41: if the output capacitance of intelligent capacitor regulator is 0, do not need to carry out capacitor replacing.
S42: if the output capacitance of intelligent capacitor regulator is greater than 0, practical adjustments electric capacity be intelligent capacitor regulator output capacitance 1/2, in one group of symmetrical brachium pontis of access, select and somely meet the capacitor that electric capacity requires and change.
Illustrate: if the output capacitance of final intelligent capacitor regulator is 0.4 μ F, only the electric capacity of brachium pontis 3 need be tuned up to 0.2 μ F, turning the electric capacity of brachium pontis 4 down 0.2 μ F, is the capacitor exchange of 0.2 μ F left and right therefore select respectively two capacitance difference in brachium pontis 3 and brachium pontis 4.
The present invention utilizes the microprocessor of intelligent capacitor regulator, call the automatically adjust output capacitance of intelligent capacitor regulator of preset automatic control program, the poor out-of-balance current of bridge after regulating is less than and arranges after threshold values, automatically regulate and finish, practical adjustments electric capacity be intelligent capacitor regulator final output capacitance 1/2, can select fast thus the capacitor unit of need changing.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (3)
1. a capacitor group H type Bridge differential current protection initial unbalance degree control method, described capacitor group is comprised of some brachium pontis, it is characterized in that, comprises the following steps:
S1, select one group of symmetrical brachium pontis, brachium pontis two ends therein connect an intelligent capacitor regulator;
S2, the threshold value of the poor out-of-balance current of a bridge is set on described intelligent capacitor regulator;
S3, start described intelligent capacitor regulator, regulate the output capacitance of described intelligent capacitor regulator, until the poor out-of-balance current of bridge of described group of symmetrical brachium pontis is less than the threshold value of the poor out-of-balance current of described bridge of setting;
S4, according to the final output capacitance value of described intelligent capacitor regulator, determine practical adjustments electric capacity, selecting needs the unit of changing to change in described group of symmetrical brachium pontis;
Wherein, step S4 comprises:
S41, judge whether the output capacitance of described intelligent capacitor regulator is 0;
S42, if the determination result is YES, described group of symmetrical brachium pontis do not need to change unit;
If the determination result is NO, determine practical adjustments electric capacity, and select to need the capacitor of changing to change in described group of symmetrical brachium pontis.
2. capacitor group H type Bridge differential current protection initial unbalance degree control method according to claim 1, is characterized in that, described step S3 comprises:
S31, under original state, the output capacitance of described intelligent capacitor regulator is 0, described intelligent capacitor regulator first detects the poor out-of-balance current value of initial bridge of described group of symmetrical brachium pontis;
S32, judge whether the poor out-of-balance current value of described initial bridge is less than the threshold value of the poor out-of-balance current of described bridge;
S33, if the determination result is YES, performs step S4;
If the determination result is NO, the grade of the output capacitance of described intelligent capacitor regulator adds 1, and whether the output capacitance of the intelligent capacitor regulator after judgement adjusting is less than or equal to the maximum output capacitance of described intelligent capacitor regulator;
If the determination result is NO for S34, return to step S1;
If the determination result is YES, return to step S31.
3. capacitor group H type Bridge differential current protection initial unbalance degree control method according to claim 1; it is characterized in that; in step S42; if the output capacitance of described intelligent capacitor regulator is greater than 0, described practical adjustments electric capacity equal described intelligent capacitor regulator output capacitance 1/2nd.
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| CN201310512016.6A CN103605392A (en) | 2013-10-28 | 2013-10-28 | Method for adjusting H-type bridge differential protection initial unbalance degree of capacitor bank |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105655986A (en) * | 2014-12-01 | 2016-06-08 | 国家电网公司 | Capacitor bank imbalance protection method and device capable of automatic calibration and dynamic compensation |
| CN105958621A (en) * | 2016-04-29 | 2016-09-21 | 合容电气股份有限公司 | Capacitor bank bridge difference protection unbalance current leveling method |
| CN106546810A (en) * | 2017-01-23 | 2017-03-29 | 国网河南省电力公司检修公司 | A kind of alternating current filter capacitor bank out-of-balance current test device |
| CN108988367A (en) * | 2018-08-07 | 2018-12-11 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of H-type wiring capacitance device group degree of unbalancedness leveling method |
| CN109449948A (en) * | 2018-10-31 | 2019-03-08 | 国网江苏省电力有限公司太仓市供电分公司 | A kind of shunt capacitor group initial failure method for early warning based on difference stream |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105655986A (en) * | 2014-12-01 | 2016-06-08 | 国家电网公司 | Capacitor bank imbalance protection method and device capable of automatic calibration and dynamic compensation |
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| CN105958621A (en) * | 2016-04-29 | 2016-09-21 | 合容电气股份有限公司 | Capacitor bank bridge difference protection unbalance current leveling method |
| CN106546810A (en) * | 2017-01-23 | 2017-03-29 | 国网河南省电力公司检修公司 | A kind of alternating current filter capacitor bank out-of-balance current test device |
| CN108988367A (en) * | 2018-08-07 | 2018-12-11 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of H-type wiring capacitance device group degree of unbalancedness leveling method |
| CN109449948A (en) * | 2018-10-31 | 2019-03-08 | 国网江苏省电力有限公司太仓市供电分公司 | A kind of shunt capacitor group initial failure method for early warning based on difference stream |
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Application publication date: 20140226 |