CN201196664Y - Test device for electric power line voltage phase angle - Google Patents
Test device for electric power line voltage phase angle Download PDFInfo
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- CN201196664Y CN201196664Y CNU2008200931592U CN200820093159U CN201196664Y CN 201196664 Y CN201196664 Y CN 201196664Y CN U2008200931592 U CNU2008200931592 U CN U2008200931592U CN 200820093159 U CN200820093159 U CN 200820093159U CN 201196664 Y CN201196664 Y CN 201196664Y
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Abstract
The utility model provides a voltage tester for a power circuit, which comprises a processing unit 1, an input unit 2 which is connected with the processing unit 1, a display unit 3, a memory unit 4, an A/D converting unit 5 and an output port 6 and also comprises a counting clock source 7, wherein the counting clock source 7 is connected with a counting unit 8 to generate a sampling pulse which is transmitted to the A/D converting unit 5. The voltage tester for the power circuit has the advantages that the counting unit is adopted for accumulatively counting the counting clock source; considering the errors of the counting clock source, the time synchronism precision and the error precision are improved as far as possible under the state of reducing the use of a GPS receiver, thereby calculating the high-precision voltage phase angle by utilization of effective acquired data in a more accurate time slice.
Description
[technical field]
The utility model relates to the proving installation of power system measuring technical field, particularly a kind of electric power line voltage phase angle.
[background technology]
Along with the continuous expansion of electric system scale, high capacity, UHV (ultra-high voltage), long distance power transmission are increasing, and the structure of electric system is increasingly sophisticated.Control from the stability and the system of electric system, phase angle is wherein topmost quantity of state, and voltage phase angle especially reflects the steady stability and the transient stability situation of electric system.Existing measurement mechanism to voltage phase angle is to determine two sampled points earlier on electrical network, it is sampled simultaneously, then image data is sent to the dispatching center by remote channel respectively, promptly obtains voltage phase angle after this image data process waveform recovery and the data analysis.Have higher clock synchronization accuracy between this proving installation, in addition, the transmission time difference of image data also can influence the voltage phase angle computational accuracy.Like this, for the long-distance transmissions electrical network of 50Hz power frequency amount, the synchronous error of 1ms can produce 18 ° phase error, guarantee phase error less than 1 °, just necessarily requires synchronous error to be no more than 55us, and prior art is difficult to reach.
As shown in Figure 1, a kind of proving installation that utilizes the existing voltage phase angle of GPS (Global Positioning System GPS is called for short GPS) system.It utilizes gps system that a common time reference is provided, and a GPS receiver (comprising 01 and 02) is set on proving installation produces synchronization pulse, and same satellite of simultaneous observation is measured the relative deviation of two proving installation clocks.Utilize the GPS receiver carry out time signal synchronously, usually can be subjected to the influence of following factor and produce error: the deviation during satellite clock relative GPS system (being called for short satellite clock correction), GPS receiver clock and the deviation of gps system clock, orbit error, relativistic effect, atmospheric envelope effect, ionospheric effect, tropospheric delay, receiver tracking ring error, multipath and occlusion effect, satellite and receiver hardware deviation of satellite or the like.Though, utilize gps system that the precision of test voltage phase angle is increased, because the above-mentioned factor that influences clock source synchronization accuracy is too many, any link goes wrong and all can cause bigger measuring error and can not satisfy test request.
[summary of the invention]
In order to solve existing technical matters, the utility model provides the proving installation of electric power line voltage phase angle, has adopted counting unit that stored count is carried out in the counting clock source, thereby has improved the synchronism precision in clock source when reducing installation cost greatly.
The technical scheme that the existing technical matters that solves the utility model adopts is: a kind of electric power line voltage proving installation is provided, it comprises processing unit 1, the input block 2, display unit 3, storage unit 4, A/D converting unit 5 and the output port 6 that link to each other with this processing unit 1, also comprise counting clock source 7, this counting clock source 7 links to each other with counting unit 8 and produces sampling pulse and transfer to A/D converting unit 5.
The utility model further improves, and described counting unit 8 comprises continuous asynchronous binary counting module 81 and last time latch module 82 that this lasts time latch module 82 and transfer to described processing unit 1 behind parallel serial conversion module 83.
The utility model further improves, and described counting unit 8 has the zero clearing input port.
The utility model further improves, and described A/D converting unit 5 is a model ADS7864 circuit.
The utility model further improves, and described storage unit 4 is model AT45DB321D32M Flash.
The utility model further improves, and described counting clock source 7 is the 25HZ crystal oscillator.
The utility model further improves, and described processing unit 1 is the ATMEGA128L circuit.
The utility model further improves, and described input block 2 comprises keyboard or mouse.
Compared to prior art, the beneficial effects of the utility model are: adopted counting unit that stored count is carried out in the counting clock source, consider the error in counting clock source itself, under the state that reduces the use of GPS receiver, improve timing tracking accuracy and error precision as much as possible, thereby on the time period more accurately, utilize effective image data to calculate high-precision voltage phase angle.
[description of drawings]
Fig. 1 is the synoptic diagram of existing GPS test voltage phase angle system;
Fig. 2 is the synoptic diagram of the proving installation of the utility model electric power line voltage phase angle;
Fig. 3 is the theory diagram of the utility model proving installation.
[embodiment]
Below in conjunction with description of drawings and embodiment the utility model is further specified.
As shown in Figure 2 to Figure 3, a kind of electric power line voltage proving installation, it comprises processing unit 1, the input block 2, display unit 3, storage unit 4, A/D converting unit 5 and the output port 6 that link to each other with this processing unit 1, also comprise counting clock source 7, this A/D converting unit 5 is a model ADS7864 circuit, and this storage unit 4 is model AT45DB321D32M Flash, this counting clock source 7 is the 25HZ crystal oscillator, this processing unit 1 is the ATMEGA128L circuit, and this input block 2 comprises keyboard or mouse
This counting clock source 7 links to each other with counting unit 8 and produces sampling pulse and transfer to A/D converting unit 5, counting unit 8 comprises continuous asynchronous binary counting module 81 and lasts time latch module 82, this lasts time latch module 82 and transfer to described processing unit 1 behind parallel serial conversion module 83, counting unit 8 also has a zero clearing input port, but this zero clearing input port incoming sync pulse, thereby carry out synchronous zero clearing.
The proving installation of use the utility model electric power line voltage phase angle is tested the voltage phase angle in the electrical network, and this method may further comprise the steps:
A: measure the error between a plurality of counting clocks source 7, same model, same batch constant temperature 25MHZ crystal oscillator are selected in this a plurality of counting clocks source 7, can reduce its systematic error or conformity error like this; Determine to influence the factor of counting clock source 7 stability and consistance deviation, set up rational error mathematic model, to guarantee in time synchronous clock to be carried out error compensation;
B: should place respectively in a plurality of electric power line voltage phase angle proving installations in a plurality of counting clocks source 7, on the power transmission lines of 50HZ power frequency amount, one counting clock source 7 is set in the electric power line voltage phase angle proving installation, has relevance between each counting clock source 7;
C: described electric power line voltage phase angle proving installation is carried out synchronous zero clearing, start stored count simultaneously, this electric power line voltage proving installation is to use same synchronizing pulse to carry out zero clearing in same place;
D: described electric power line voltage phase angle proving installation voltage to power circuit in the sampling period carries out data sampling, and sampled data deposits in the storage unit 4, and the sampling period was made as 5 minutes;
E: import sampled data into CVI (C For Virtual Instruments) development platform and carry out analysis meter and calculate voltage phase angle, this CVI development platform can be selected NI/CVI development platform (NationalInstruments American National Instr Ltd.).
Step D in the said method is further comprising the steps of:
D1: many unified sample command that start of described electric power line voltage proving installation promptly begin sampling at same theory under start-up time;
D2: many described electric power line voltage proving installations carry out the voltage data collection with A/D (analog todigital converter analog to digital converter) converting unit 5 in the sampling period, it is ADS7864 that this A/D converting unit 5 is selected model for use; This ADS7864 is two 12 A/D converters of quick 6 passage fully differentials input, can carry out the sampling of six channel signals simultaneously with the sampling rate of 500kHz;
D3: sampled data imported in the storage unit 4 preserve, it is AT45DB321D 32M Flash that this storage unit 4 is selected model for use.
Step e in the said method is further comprising the steps of:
E1: import the image data of storage into PC;
E2: last the time with each image data of CVI development platform comparison on PC (personal computer) machine is pairing, cooperate the error in counting clock source 7 to determine in the image data efficiently sampling data segment simultaneously in the absolute time section;
E3: described efficiently sampling data segment analyzed with waveform recover to calculate the voltage phase angle parameter.
Proving installation of the present utility model has adopted counting unit that stored count is carried out in the counting clock source, consider the error in counting clock source itself, under the state that reduces the use of GPS receiver, improve timing tracking accuracy and error precision as much as possible, thereby on the time period more accurately, utilize effective image data to calculate high-precision voltage phase angle.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (8)
1. electric power line voltage proving installation, it comprises processing unit (1), the input block (2) that links to each other with this processing unit (1), display unit (3), storage unit (4), A/D converting unit (5) and output port (6), it is characterized in that: also comprise counting clock source (7), this counting clock source (7) links to each other with counting unit (8) and produces sampling pulse and transfer to A/D converting unit (5).
2. electric power line voltage proving installation according to claim 1, it is characterized in that: described counting unit (8) comprises continuous asynchronous binary counting module (81) and lasts time latch module (82) that this lasts time latch module (82) and transfer to described processing unit (1) behind parallel serial conversion module (83).
3. according to claim 1 or 2 any described electric power line voltage proving installations, it is characterized in that: described counting unit (8) has the zero clearing input port.
4. electric power line voltage proving installation according to claim 1 is characterized in that: described A/D converting unit (5) is a model ADS7864 circuit.
5. electric power line voltage proving installation according to claim 1 is characterized in that: described storage unit (4) is model AT45DB321D 32M Flash.
6. electric power line voltage proving installation according to claim 1 is characterized in that: described counting clock source (7) is the 25HZ crystal oscillator.
7. electric power line voltage proving installation according to claim 1 is characterized in that: described processing unit (1) is the ATMEGA128L circuit.
8. electric power line voltage proving installation according to claim 1 is characterized in that: described input block (2) comprises keyboard or mouse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200931592U CN201196664Y (en) | 2008-04-02 | 2008-04-02 | Test device for electric power line voltage phase angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200931592U CN201196664Y (en) | 2008-04-02 | 2008-04-02 | Test device for electric power line voltage phase angle |
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| Publication Number | Publication Date |
|---|---|
| CN201196664Y true CN201196664Y (en) | 2009-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008200931592U Expired - Fee Related CN201196664Y (en) | 2008-04-02 | 2008-04-02 | Test device for electric power line voltage phase angle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425688A (en) * | 2015-12-31 | 2016-03-23 | 深圳市科陆电子科技股份有限公司 | Analog-to-digital (AD) synchronous sampling value assigning method |
-
2008
- 2008-04-02 CN CNU2008200931592U patent/CN201196664Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425688A (en) * | 2015-12-31 | 2016-03-23 | 深圳市科陆电子科技股份有限公司 | Analog-to-digital (AD) synchronous sampling value assigning method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090218 |