CN206440760U - A kind of measurement apparatus of overhead distribution zero-sequence current - Google Patents
A kind of measurement apparatus of overhead distribution zero-sequence current Download PDFInfo
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- CN206440760U CN206440760U CN201621480785.8U CN201621480785U CN206440760U CN 206440760 U CN206440760 U CN 206440760U CN 201621480785 U CN201621480785 U CN 201621480785U CN 206440760 U CN206440760 U CN 206440760U
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Abstract
Technical solutions of the utility model disclose a kind of zero sequence current measurement device of overhead distribution, including：A phases fault indicator for overhead lines, B phases fault indicator for overhead lines, C phase fault indicator for overhead lines, it is respectively arranged on the A phase, B phase, C phase circuit of overhead distribution, one data collection station, uses radio frequency communication or infrared communication or other wireless communication modes between A phases fault indicator for overhead lines, B phases fault indicator for overhead lines and C phases fault indicator for overhead lines and data collection station.Zero-sequence current value, and equipment economy can be accurately measured, it is easy to operate.
Description
Technical field
The utility model is related to electrotechnical measurement technical field, more particularly to a kind of measurement of overhead distribution zero-sequence current
Device and measuring method.
Background technology
Overhead distribution is widely distributed in city and rural area broad area, easily by natural environment and human factor
Deng interference and occur singlephase earth fault, overhead distribution normal power supply is influenceed, when overhead distribution occurs single-phase to connect
During earth fault, the zero-sequence current in overhead distribution will increase, therefore can be using the increase of overhead distribution zero-sequence current
Condition be used as one of decision condition of overhead distribution singlephase earth fault.Measured usually using zero sequence current mutual inductor
Zero-sequence current in circuit, as shown in figure 1, A phases, B phases and C phase lines to be passed through to the center of zero sequence current mutual inductor, from zero sequence
The second siding ring output zero sequence current measurement signal of current transformer, but due to overhead distribution distribution out of doors, and
The A phases of overhead distribution, B phases and C phase lines are apart from each other, therefore conventional zero sequence current mutual inductor is not particularly suited for making somebody a mere figurehead
The zero sequence current measurement of distribution line.
Utility model content
The purpose of this utility model is to provide a kind of measurement apparatus of overhead distribution zero-sequence current, including：A phases are maked somebody a mere figurehead
Line-failure indicator, B phases fault indicator for overhead lines, C phase fault indicator for overhead lines, are respectively arranged in overhead distribution
On the A phase, B phase, C phase circuit of circuit, a data collection station, A phases fault indicator for overhead lines, the event of B phases overhead transmission line
Hinder between indicator and C phases fault indicator for overhead lines and data collection station using radio frequency communication or infrared communication or its
Its wireless communication mode.
Because the phase between the voltage of overhead distribution is fixed, A phases, B phases and the C phases electricity of overhead distribution
Mutual phase angle is 120 degree between pressure, therefore can be using overhead distribution line line fault indicator come measurement circuitry current value
And the phase value of line current and line voltage distribution, A phases, B phases and C phase lines electric current are then subjected to Vector modulation, so that
To the zero-sequence current of overhead distribution.The method need not send synchronizing signal to each acquisition module, and used is asynchronous
Acquisition method.
A phases fault indicator for overhead lines, B phases fault indicator for overhead lines and C phase fault indicator for overhead lines framves
The A phases for the overhead distribution that ceases to be busy line fault indicator measurement is obtained, B phases, C phase line current values are respectively Ia, Ib, Ic,
Phase angle between line current and line voltage distribution is respectively θ a, θ b, θ c, then zero-sequence current value Io is：
Wherein：
Iox=Ia*cos (θ a)+Ib*cos (θ b)+Ic*cos (θ c)
Iox=Ia*sin (θ a)+Ib*sin (θ b)+Ic*sin (θ c)
The beneficial effects of the utility model are：A kind of zero sequence current measurement device of overhead distribution is provided, by data
Acquisition terminal receives A phases fault indicator for overhead lines, B phases fault indicator for overhead lines and C phase overhead transmission line indicating fault
Obtain the phase angles data between line electricity flow valuve and line current and line voltage distribution measured by device, and by A phases, B phases and C phase lines
Road electric current carries out Vector modulation, so as to obtain the zero-sequence current of overhead distribution.Zero-sequence current value can be accurately measured, and
Equipment economy, it is easy to operate.
Brief description of the drawings
Fig. 1：Zero sequence current mutual inductor
Fig. 2：The measurement apparatus structural representation of overhead distribution zero-sequence current of the present utility model
Embodiment
The utility model is made below in conjunction with Figure of description and being specifically described.
As shown in Fig. 2 the purpose of this utility model is to provide a kind of measurement apparatus of overhead distribution zero-sequence current, bag
Include：A phases fault indicator for overhead lines 1, B phases fault indicator for overhead lines 2, C phases fault indicator for overhead lines 3, respectively
It is installed on the A phase, B phase, C phase circuit of overhead distribution, a data collection station 4, A phase fault indicator for overhead lines
1st, less radio-frequency is used between B phases fault indicator for overhead lines 2 and C phases fault indicator for overhead lines 3 and data collection station 4
Communication or infrared communication or other wireless communication modes.
Because the phase between the voltage of overhead distribution is fixed, A phases, B phases and the C phases electricity of overhead distribution
Mutual phase angle is 120 degree between pressure, therefore can be using overhead distribution line line fault indicator come measurement circuitry current value
And the phase value of line current and line voltage distribution, A phases, B phases and C phase lines electric current are then subjected to Vector modulation, so that
To the zero-sequence current of overhead distribution.
The method need not send synchronizing signal to each acquisition module, and used is asynchronous collecting method.
A phases fault indicator for overhead lines, B phases fault indicator for overhead lines and C phase fault indicator for overhead lines framves
The A phases for the overhead distribution that ceases to be busy line fault indicator measurement is obtained, B phases, C phase line current values are respectively Ia, Ib, Ic,
Phase angle between line current and line voltage distribution is respectively θ a, θ b, θ c, then zero-sequence current value Io is：
Wherein：
Iox=Ia*cos (θ a)+Ib*cos (θ b)+Ic*cos (θ c)
Iox=Ia*sin (θ a)+Ib*sin (θ b)+Ic*sin (θ c)
The beneficial effects of the utility model are：A kind of zero sequence current measurement device of overhead distribution is provided, by data
Acquisition terminal 4 receives A phases fault indicator for overhead lines 1, B phases fault indicator for overhead lines 2 and C phase overhead transmission line failures and referred to
Show and phase angles data between line electricity flow valuve and line current and line voltage distribution is obtained measured by device 3, and by A phases, B phases and C
Phase line electric current carries out Vector modulation, so as to obtain the zero-sequence current of overhead distribution.Zero-sequence current value can be accurately measured,
And equipment economy, it is easy to operate.
Claims (1)
1. a kind of zero sequence current measurement device of overhead distribution, it is characterised in that including：A phase overhead transmission line indicating fault
Device, B phases fault indicator for overhead lines and C phase fault indicator for overhead lines, are respectively arranged in A phases, the B of overhead distribution
In phase, C phase lines, in addition to a data collection station, the data collection station and A phases fault indicator for overhead lines, B phases
Radio frequency communication or red is used between fault indicator for overhead lines and C phases fault indicator for overhead lines and data collection station
Outer communication or other wireless communication modes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620712451 | 2016-06-30 | ||
| CN2016207124512 | 2016-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206440760U true CN206440760U (en) | 2017-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621480785.8U Active CN206440760U (en) | 2016-06-30 | 2016-12-30 | A kind of measurement apparatus of overhead distribution zero-sequence current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107102194A (en) * | 2016-12-30 | 2017-08-29 | 浙江万胜智能科技股份有限公司 | A kind of measurement apparatus and measuring method of overhead distribution zero-sequence current |
| CN107677933A (en) * | 2017-11-21 | 2018-02-09 | 桂林师范高等专科学校 | Detecting fault line for un-ground neutral power system |
-
2016
- 2016-12-30 CN CN201621480785.8U patent/CN206440760U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107102194A (en) * | 2016-12-30 | 2017-08-29 | 浙江万胜智能科技股份有限公司 | A kind of measurement apparatus and measuring method of overhead distribution zero-sequence current |
| CN107677933A (en) * | 2017-11-21 | 2018-02-09 | 桂林师范高等专科学校 | Detecting fault line for un-ground neutral power system |
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