CN100338840C - Phase checking method for merging electric transmission line into electric grid - Google Patents
Phase checking method for merging electric transmission line into electric grid Download PDFInfo
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- CN100338840C CN100338840C CNB2005100963772A CN200510096377A CN100338840C CN 100338840 C CN100338840 C CN 100338840C CN B2005100963772 A CNB2005100963772 A CN B2005100963772A CN 200510096377 A CN200510096377 A CN 200510096377A CN 100338840 C CN100338840 C CN 100338840C
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Abstract
The present invention discloses a phase checking method for merging transmission lines into electric grids, and firstly enables three phase lines of a transmission cable on the first point to be arbitrarily numbered as (A), (B) and (C) by two standard frequency sources (F1) and (F2) which are synchronously calibrated; thereafter, a transmission cable phase (A) on the first point is simultaneously sampled, detected and compared with the standard frequency sources (F1), (F2), and simultaneously, the frequency signal phase difference values of the line (A) displayed by the (F1) and the (F2) are consistent. Furthermore, the standard frequency source (F1) is reserved on the line (A) on the first point, the standard frequency source (F2) is moved into transmission cables on the second point, which need to be merged, and the three phases are orderly sampled and detected. When a displayed value of the voltage phase difference obtained by the standard frequency source (F2) is identical to a value (delta a) of the voltage phase difference displayed by the standard frequency source (F1) on the line (A) on the first point, a transmission cable line on the second point and the line (A) on the first point can be determined to have the same phase, namely a phase (a), and the like, the other two phases of the transmission line on the second point are determined and exactly identified; thereby, the safe and parallel-in power supply can be achieved.
Description
Technical field
The present invention relates to the operation method of electric power transmission line, the phase place nuclear-phase method when particularly a kind of transmission line is incorporated into the power networks.
Background technology
In an independent power supply grid, often, therefore need transmission line with first, second two places to unite two into one sometimes and power the promptly so-called power supply of being incorporated into the power networks to third place because the ambassador's electrical network that adds of power load can't bear the heavy load and influences power supply quality.For guaranteeing the power supply safety operation of being incorporated into the power networks, before being incorporated into the power networks, must judge the phase place of first, second two place's each power line of service cable, to accomplish the homophase parallel operation.Existing nuclear-phase method is to adopt the measuring stick that divider resistance R1, R2 are housed that the A of first place, each phase voltage of B, C are compared with a potentiometer with a of second place, each phase voltage of b, c respectively, is defined as homophase when the potential difference of first, second line-to-line is zero.The shortcoming of this method is: because the imbalance of electrical network power load, the potential difference that compares between same first " A " Xiang Yuyi " a " phase is also non-vanishing, thereby causes difficulty for accurate nuclear phase, is easy to generate false judgment, and its nuclear phase operation is also inconvenient, and fail safe is very poor.
Summary of the invention
The objective of the invention is to improve the defective of the existing supply line's nuclear-phase method that is incorporated into the power networks, the nuclear-phase method that provides a kind of transmission line that accurately detects based on standard frequency source to be incorporated into the power networks.
For achieving the above object, the present invention takes following technical scheme to be achieved:
The first step earlier with the first standard frequency source F1, the same step calibration of the second standard frequency source F2, makes its frequency consistent with phase place;
In second step, it is A phase, B phase, C phase that first place power transmission cable three-phase is carried out arbitrary number;
The 3rd step, with the first standard frequency source F1, the second standard frequency source F2 simultaneously to the A of first place power transmission cable three-phase detections of taking a sample mutually, the voltage-phase difference of acquisition unanimity;
The 4th step, the first standard frequency source F1 is remained on the A of the first place line, remove the power transmission cable that the second standard frequency source F2 need be incorporated into the power networks to the second place, successively to the detection of taking a sample of its three-phase, if voltage phase difference indicating value that the second standard frequency source F2 obtains and the voltage phase difference indicating value Δ that stays the first standard frequency source F1 on the A line
aUnanimity can determine that then this second place power transmission cable line is consistent with the A of first place phase of line, promptly is designated a phase;
In the 5th step, by above-mentioned third step mutually or C detections of taking a sample mutually, obtain the voltage-phase difference of unanimity to the B of first place;
The 6th step, by above-mentioned the 4th step with the second standard frequency source F2 again to all the other two-phases of second place power transmission cable detections of taking a sample successively, if the voltage phase difference indicating value of acquisition and stay the voltage phase difference indicating value Δ of the first standard frequency source F1 on B line or C line
bOr Δ
cUnanimity can be defined as b phase or c phase, and residue one need not contrast mutually and can determine.
Adopt the advantage of the inventive method to be, easy and simple to handle, safe and reliable, accuracy of judgement degree height, and be not subjected to the influence of voltage ripple of power network.
Description of drawings
Fig. 1 is a nuclear-phase method schematic diagram of the present invention.
Fig. 2 is a standard frequency source structured flowchart of the present invention.
Voltage phase difference indicating value schematic diagram when Fig. 3 is a nuclear phase of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples:
As shown in Figure 1, a kind of transmission line nuclear-phase method that is incorporated into the power networks adopts two 50Hz standard frequency source F1 and F2 that have than high stability and accuracy, and at first with the same step calibration of standard frequency source F1, F2, being about to its frequency is consistent with phase adjusted; It is A, B, C that first place power transmission cable triple line is carried out arbitrary number; Then with standard frequency source F1, F2 simultaneously to arbitrary phase of first place power transmission cable three-phase, take a sample mutually as A and to detect and contrast, this moment, the standard-frequency signal of F1 and F2 will produce phase difference value with A frequency signal mutually, because the power-frequency voltage frequency that generator produces is to fluctuate in the scope of a permission, so what standard frequency source F1 and F2 were shown is not also stopping variation with A phase of line difference, but F1 is consistent with the shown phase difference indicating value Δ a of F2; Remain in standard frequency source F1 on the A of the first place line this moment, remove the power transmission cable that standard frequency source F2 need be incorporated into the power networks to the second place, successively to the detection of taking a sample of its three-phase, when if the shown voltage phase difference indicating value Δ a of the voltage phase difference indicating value that standard frequency source F2 obtains and the standard frequency source F1 on the A of the first place line is consistent, can determine that then this second place power transmission cable line and the A of first place line are homophase, i.e. a phase;
The rest may be inferred, again to the B of first place or the C detection of taking a sample mutually, obtains consistent voltage-phase difference by above-mentioned steps; Again with standard frequency source F2 to all the other two-phases of second place power transmission cable detection of taking a sample successively, and with the voltage phase difference indicating value Δ of standard frequency source F1
bOr Δ
c' relatively, can determine b or c phase, residue one need not contrast mutually and can determine; Also can carry out the repeated multiple times contrast with said method, power transmission cable each phase a, b, the c at second place accurately can be identified at last, realize being incorporated into the power networks safely power supply.
As Fig. 2, shown in Figure 3, the nuclear-phase method of present embodiment adopts two standard frequency source F1 and F2, and its circuit structure mainly constitutes with the display 4 that phase comparator 3 output end signals are connected with the high pressure sampler 1 of actinobolia connection input, the 50Hz frequency generator 2 of standard, phase comparator 3, the input that input is connected with the output end signal of high pressure sampler 1 and 50Hz frequency generator 2 on tested cable phase line 5 by one.Before the nuclear phase, high pressure sampler 1 is not worked, and only needs by 50Hz frequency generator 2 and phase comparator 3 frequency, the phase adjusted of standard frequency source F1 and F2 to be become consistent and gets final product; In the nuclear phase process, the high pressure measured signal U of high pressure sampler 1
TStandard-frequency signal U with 50Hz frequency generator 2
50In phase comparator 3, compare and produce voltage phase difference indicating value Δ
(a, b, c)By display output, its Δ
(a, b, c)Expression is to the measurement result Δ of isopen A, B, C not
a, Δ
b, Δ
c
Claims (1)
1. a phase checking method for merging electric transmission line into electric grid is characterized in that it comprises the steps:
The first step earlier with first standard frequency source (F1), the same step calibration of second standard frequency source (F2), makes its frequency consistent with phase place;
In second step, it is A phase, B phase, C phase that first place power transmission cable three-phase is carried out arbitrary number;
The 3rd step, with first standard frequency source (F1), second standard frequency source (F2) simultaneously to the A of first place power transmission cable three-phase detections of taking a sample mutually, the voltage-phase difference of acquisition unanimity;
The 4th step, first standard frequency source (F1) is remained on the A line, remove the power transmission cable that second standard frequency source (F2) need be incorporated into the power networks to the second place, successively to the detection of taking a sample of its three-phase, if voltage phase difference indicating value that second standard frequency source (F2) obtains and the voltage phase difference indicating value Δ that stays first standard frequency source (F1) on the A line
aUnanimity can determine that then this second place power transmission cable line is consistent with the A of first place phase of line, i.e. mark a phase;
In the 5th step, by above-mentioned third step, mutually or C detections of taking a sample mutually, obtain the voltage-phase difference of unanimity to the B of first place;
The 6th step, by above-mentioned the 4th step, with second standard frequency source (F2) again to all the other two-phases of second place power transmission cable detection of taking a sample successively, if voltage phase difference indicating value that obtains and the voltage phase difference indicating value Δ that stays first standard frequency source (F1) on B line or C line
bOr Δ
cUnanimity can be defined as b phase or c phase, and residue one need not contrast mutually and can determine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100963772A CN100338840C (en) | 2005-11-17 | 2005-11-17 | Phase checking method for merging electric transmission line into electric grid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100963772A CN100338840C (en) | 2005-11-17 | 2005-11-17 | Phase checking method for merging electric transmission line into electric grid |
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| Publication Number | Publication Date |
|---|---|
| CN1761117A CN1761117A (en) | 2006-04-19 |
| CN100338840C true CN100338840C (en) | 2007-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100963772A Expired - Fee Related CN100338840C (en) | 2005-11-17 | 2005-11-17 | Phase checking method for merging electric transmission line into electric grid |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2640400C9 (en) * | 2011-08-04 | 2018-04-06 | СЛЕ Интернатионал ЛЛС | Single-wire electrical system |
| CN107962982B (en) * | 2017-12-05 | 2023-10-13 | 西南交通大学 | Three-phase traction power supply system and vehicle-mounted power supply system |
| CN113555905B (en) * | 2021-09-22 | 2022-07-01 | 华邦创科(惠州市)智能科技有限公司 | Three-phase four-wire power supply intelligent phase correction method and system |
| CN115825560B (en) * | 2023-02-17 | 2023-05-23 | 青岛鼎信通讯股份有限公司 | Intelligent phase checking method of electric power network based on frequency tracking technology |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2080723U (en) * | 1990-06-21 | 1991-07-10 | 蔡志臻 | In-phase detector |
-
2005
- 2005-11-17 CN CNB2005100963772A patent/CN100338840C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2080723U (en) * | 1990-06-21 | 1991-07-10 | 蔡志臻 | In-phase detector |
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| CN1761117A (en) | 2006-04-19 |
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