TW380206B - Phase inspection system - Google Patents

Abstract

system as the synchronized sampling of electric signal which uses two phase inspectors with signal receiver of global satellite positioning system to simultaneously measure synchronized voltages or current signals from two remote sites to get the phase order. Then, applying phasor measurement to get the synchronized phase angles of the transmission line at both sites and employing the relative angles to judge whether the corresponding phases of both sites have the same relationship; or, with one of the sides as the reference phase order to inspect the correct phase of the unknown phase order of the other site via cable or wireless communication.

Description

Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs:-A7 ----- ----- B7. Description of the Invention (丨) ~ ------- [Technical Field of the Invention] The present invention relates to a The phase difference test system, more specifically, this month is about the phase difference test system of the power system through the satellite positioning synchronous phasor measurement town line phase difference. [Background of the Invention and Previous Techniques] The basic theoretical basis of phasor measurement of power systems = ”,, and ⑴” a few years ago, but due to the consideration of hardware and cost, it is only applied in time In terms of control, protection, and stability [M, "]. However, due to the rapid development of microprocessors in recent years, the relative cost has decreased, which has made monitoring, monitoring, and detailing of satellite positioning systems feasible. [6] "Whether the difference is correct or not _ Zhuo Tong operation stability and women 3 'value-worth power companies are actively promoting the automation of distribution feeders' with W system power supply efficiency and quality f, but for the horizontal edge & amp installed on the distribution feeder If the installation is wrong, the automatic system will misjudge and cause the line to malfunction. The correctness of the distribution feeders often troubles the field operators. At present, there are two ways to distribute the distribution lines overhead and underground. When the phase sequence is determined to be the same phase sequence when no power outage is implemented, parallel operation can be performed. However, due to the overhead and underground configuration of the feeder, it is difficult to determine the phase difference. Into substations, the feeders are out of power. In particular, power companies are currently promoting the automation of distribution feeders. If the installed detectors are different, they will cause trouble to the automation operation. At the end of 83, Taipei opened The inspection and acceptance of its distribution automation system is based on the Chinese national standard (CNS) A4 (210x297 mm) (谙 Read the precautions on the back before filling in this page)

Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. 5. Description of the invention. Assistance in measuring the induced voltage of the communication cable. In the feed and German fault acceptance system, the #_ 线 (FTU) phase wiring is incorrect. The confession will be transferred at the right time, so it is necessary to have a correct judgment on the difference. The invention develops a different tester to solve the problem faced by two people at the scene. The present invention combines a global satellite positioning system (Giobaponton System) to develop a set of phase-specific test systems to solve the problem of on-site phase application and reduce accident aftercare work. τ ^ System The main purpose of the present invention is to provide a set of high-reliability discriminant tests. Another purpose of the present invention is to provide a discriminant test system that synchronizes the global slave device to obtain sampling data. Another object of the present invention is to provide a phase difference test method for measuring phase difference between two points of voltage or current signals on an electric power feeder. [Invention Summary] In view of the conventional technology, there is a problem of reliability in phase difference determination. And application disadvantages and inconveniences, the present invention mainly uses the Global Positioning System (GPS) satellite # receiver 'receiving time signals to apply for data synchronization in power system rural charging, and then uses recursive Fourier transform ( Recursive Fourier Transformation) calculates the measured phasor, and compares the phases of the two sides through wired or wireless communication to determine the difference, as a reference for field operators. The phase difference test system of the present invention uses the satellite word _ hour signal of the Global Positioning System as a synchronization source for electrical signal sampling, and uses two retrofitted global satellite paper standards to apply Chinese National Standard (CNS) A4 Zhuge (210X297 mm) ) IK ---------- \-/·-.· (read the note on the back first and then fill out this page) ^ 1 J. n ^ l nt In ^^^ 1 ^ 1.1 mt ^ n ^ nt m ml I -.8 ml ^^ 1 1 m Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs, A7 B7, V. Description of the invention () 3 star positioning system signal receiver phase difference tester, The phase sequence is obtained after synchronously measuring the synchronous voltage or current signals of the two places in the distance. After phasor measurement, the synchronous phase angle of the feeders in the two places is obtained, and the relative angle relationship between the two places is used to determine the comparison Whether the phases are the same; or use one end as a reference phase sequence and detect the correct phase difference of the unknown phase sequence at the other end via wired or wireless communication. [Brief description of the drawings] The different test system of the present invention and its many advantages and features will be further understood from the following detailed description and the attached drawings. FIG. 1 is a structural diagram of a different test system according to the present invention. FIG. 2 is a block diagram of a phase difference tester according to the present invention. Figure 3 is a schematic diagram of the phase angle difference between two voltages on the bus. Figure 4A and B are schematic diagrams of the phasor Cardison diagram. Figure 5A and B are schematic diagrams of recursive and non-recursive phasors. Figure 6 shows the GPS receiver and output signals. Figure 7 is a block diagram of a phasor operation and signal processing unit and a signal conversion unit. Figure 8 shows the basic architecture of the ADX3000 accident recorder. Figure 9 is a functional block diagram of the satellite time card. [Explanation of Figure Numbers] Phase Tester 10 Phasor Calculation and Signal Processing Unit 11 Satellite Signal Receiver 12 This paper size is applicable to Chinese National Standard (CNS) A4 Zhuge (210X297 mm) (Please read the first Note: Please fill in this page again.) Order 5. Description of the invention (4) Α7 Β7 Signal conversion unit 13 Display 14 Microprocessor 110 Data acquisition system 111 Data buffer 112 Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs [Invention of Detailed description] First, referring to FIG. 1, an architecture diagram of a different test system according to the present invention is shown. The phase difference test system of the present invention requires that the acquisition of feeder data in any two places in the power system must be synchronized. To achieve this requirement, the synchronized pulse wave signal must be continuously sent to the phase testers 10 as the stations of each station. The reference signal is used for synchronous sampling. Therefore, the phase difference tester 10 of the present invention is equipped with a global satellite positioning system (GPS) signal receiver, and uses its output time signal as a reference signal for synchronous sampling, and each station gives the captured signal to the time signal according to this time signal. Time stamp, and then through the modem, each measuring station sends the data to the host computer to make a different judgment here. By using this phasor measurement method to monitor the phase angle of any different busbars in the power system, the phase difference can be accurately judged. The overall test architecture of the phase difference test system of the present invention is as described above, and two phase testers 10 are required to perform the test. Next, referring to Fig. 2, a block diagram of a different tester according to the present invention is shown. The phase difference tester 10 includes three basic units: (a) phasor operation and signal processing unit 11 (b) satellite 俨 receiver 12 (C) signal conversion unit 13. Figure two party #partial + = 5 Ten thousand pieces of pictures reveal the connection relationship between each unit. The phasor calculation and signal processing unit i 丨 can include: microprocessor_template, data extraction system, system (A / wD / = This paper size applies to China National Standard (CNS) A4 specification (210 × 29ί7mm) ) (Please read the notes on the back before filling out this page)

Economy, 7 Central Standards Bureau employee consumer cooperative printed A7 B7 V. The voltage phase angle and rotation angle in the system describe the state of the system (inventor of the converter), and. The serial structure provides a fine structure that will be described in the following paragraphs. The signal conversion unit is replaced with a low-profile protection device and electromagnetic interference prevention capability. The voltage signal is switched to two voltages, and the high and low voltages are isolated by optical fibers for A / D conversion. There is a receiver 7 玍 彳 ° 鞔, which will be described in more detail below, where PPS means a pulse output per second. The measurement principle is an important change in electricity | i% Wei., X ',, ~ Jie,, Zhu Ju. ▲ Voltage magnitude 'Phase angle, admittances and boundary injection conditions are known. That is, real work and virtual work are calculated as soon as the book machine is established. The rotation angles between generators become equally important 'because they represent important state variables in controlling power systems. Phase angle measurement has been put into practice. For example, reference [7] uses microwave to transmit AC voltage waveform to the control center, and then digital converters calculate the phase angle of the voltage between different positions and provide it to dispatchers. reference. In reference [8], another measurement system that emphasizes the reduction of data transmission load has also been proposed. These applications all need accurate synchronization signals at all measurement points to reduce system measurement errors. Using the phasor measurement method, as a technique for distinguishing judgments, the accuracy of data acquisition is a very important part. The acquisition of data at each point must be synchronized [6, 8] to reduce the measurement. The error. During the data acquisition process, the phase angle difference between different points depends on the sampling synchronization signal between each point. These sampling values can be transmitted to the host computer through communication to calculate different confluences. The paper size is applicable to the Chinese National Standard (CNS) A4 Zhuge (210X297mm) ---- (Please read the notes on the back before filling in this page)

A7 __ ____ B7

•-___ I V. Description of the invention (6) 1 ^ The phase angle difference between the buses, so as to determine the phase difference. As shown in Figure 3, the schematic diagram of the phase angle difference between the two voltages on the busbar is a simple case of a point on the feeder ^ outlet of the transformer substation. For any two points in the power distribution system, this phase tester 10 can be used to check whether the phase indication is correct. When calculating the phase angle difference between the two points of the feeder, it must be determined that these sample values are captured within the same sampling time. This method can be completed by adding an external time synchronization signal to each measurement station. The selection of the sampling frequency often depends on the needs of the actual application. For example, the monitoring of the power system, the sampling interval is suitable to be set in the range of a few seconds, and for control applications, the faster the sampling speed, the better. As for this tester, It can be arbitrarily set within 10KHz, but because the phase difference test is to use the pulse wave per second sent by the GPS receiver as a synchronous operation, its sampling speed can be set at 720Hz, which will be described in detail later. Phasor Calculation From a mathematical point of view, a phasor in a power system is a two-dimensional vector. The term phasor is used to avoid confusion with space vectors. The phasor angle represents time instead of space. To add some sine functions with the same frequency, you can first use phasor expressions, and then use vector algebra to add these phasors. Consider a sine wave input signal X (t) with a calendar frequency as shown below. Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the cautions on the back ¾ before filling out this page)-^ (0 = XmCOS {(Dt + φ) (l) This signal is represented by a phasor χ, The following formula can be obtained. The diagram of the phasor can be obtained by plotting the real and imaginary components on the Cortesian coordinates. Please refer to Figure 4A, which shows the phase angle of the sine function X and the diagram of the phasor X As shown in Figure 4B. This paper is approved to apply Chinese National Standard (CNS) M Zhuge (nox 297) Chu A7 B7

V. Description of the invention (7 X

X X., m ^] φ _ a_ m ejr = λ / 2 λ / 2 COS (j) + j ~ ^ SIN (l) λ / 2 ⑵ The phasor can only represent a sine wave of stable frequency. Unstable phenomena due to transient conditions cannot be directly represented and analyzed using phasors. Therefore, a clear phasor represents the fundamental frequency of a waveform in a certain interval, so that the concept of phasor can be applied to more complex signal expressions. Assuming that the X (t) signal is sampled N times in a period (its frequency is 60 Hz), a set of sampling data can be obtained.

Xk = X ^ SlN ^ -k + φ) (3) (谙 Read the notes on the back before filling this page) The split-transistor transform contains the fundamental frequency component Λ ^ Ν. 2π1-^-Υχ, βλ / 2 Ν Ν -k Order k = l (4) or 2 Ν 2π Ν 2π Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economy λ / 2 Ν \ _1_ where y XkCOS——k-jT XkSIN——ktx ^ tl N. (Xc-jXs) ⑸ Ν

Xc = YXkCOS ^ k k = l This paper size is applicable to Chinese National Standard (CNS) A4 Zhuge (210'〆297 mm) V. Description of the invention

N A7 B7 θ '2π ~ ¥ Ν

Xs-Txk ^ IN {ek) (6) k = l From the formula (1), we can get the sample values x, xmcos, e, χ ^ × ^ ΟΞ ^ Θ + φ) ⑺ (Please read the precautions on the back before (Fill in this page)

, TT XN = XmCOS {· ^ Substituting Equation (7) into Equation (4), T] = ^ fjXmC〇S (k0 + (fi) e- m (8) Printed by the Consumer Consumption Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs α33 {ΚΘ + φ) = ^ {ke + φ) + ^ jike + φ) Substituting the formula (9) into the formula (8), we can get 2 Ν 2 ⑼ 4ΪΝ2 1 = 1 This paper standard is applicable to the Chinese National Standard (CNS) A4 is present (210X297 mm) 5. Invention description or 42

Xe ίΦ V2 Ν 7Γ A7 B7

N e

-j2kO (10) k = \ Σ k = \ e -j2k0 e ~ j2 \\-e-] 2NΘ, (le -P · θ, so ΐΦ V2 m can be obtained by the above equation and the sine wave phasor equation (2 ) Is the same. Then refer to Figure 5, which shows the schematic diagram of recursive and non-recursive phasors. The instant of the first sampling window can define the phasor orientation on the complex plane, and the phase can be calculated from the data of the first sampling window. The value is used as the horizontal axis of reference. Equation (5-6) is the basic theoretical basis of phasor measurement. The present invention uses the recursive method of this theory to simultaneously calculate the phase angle of two points on the feeder to achieve The purpose of phase. Consider the two sets of sampled values {k =: l, 2 .., N} and meaning + 1 {k = l, 2 ..., N}, and their corresponding phasors I1 and X1 are: 2 Ν γχ, e

-jkO ** 1 I- ---- 1 -—. I 1 nil--—I— II .1— n — 1---· m ^ i ϋ ^ ί n -------- -(Please read the notes on the back before filling out this page) X2 'λ / 2 N 1 9 ΝΤ2ΝΐΧ-

(ID e ~ jk9 (12) Changeable formula (12) to get a recursive phasor calculation formula. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm). Λ7 ΙΓ 5. Description of the invention (10 X1 '= 2

N

jkQ \ rT ^ = 12 _ (13) Ί2ν12χ ^ Θ4lN ^ xXkeJ + ~ β ~ ^ {ΧΝ + ι 6ΚΝ ^ θ_χ ^ 〇 According to the results of the above formula, the phasor Z2, the phase angle is greater than the phasor ^ phase angle θ f (P is the sampling angle), which can be clearly seen from Figure 5A. The formula (⑷Angle = mesh size / 2: from the phasor ~-phase angle ㈣, when the phase, from the two angles.! 1 This! The input signal is shown in Figure 5 of a stable sine wave. The value obtained by recursive phasor calculation is -111 fixed complex value, such as z2 = e-j9X2 '= χΐ (14),: ---- ί \ (Please (Read the notes on the back before filling out this page)

Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs (15) General formula: xr + l = xr + Sl, which is derived from the recursive calculation formula. You can add and subtract from the old window data-pen data to quickly Calculate the new phasor value. If there is-stable ^ sine wave input 'in the recursive operation', because its addition and subtraction sampling values are the same (frequency, amplitude and phase angle are unchanged), it can be obtained-a fixed complex value. This paper scale is applicable to Α7 Β7 V. Description of the invention (u) Satellite time synchronization The phase difference tester of the present invention mainly uses the voltage phasor of the feeder as a reference. These feeder phasor measurements must have a common time reference point. As mentioned earlier, the synchronization of the sampled signals allows the measured phasors to have a common reference. In this way, the data sent from each phase tester to the host computer for comparison is meaningful. The accuracy of the synchronization signal becomes the most important factor for the accuracy of this phase difference tester. The accuracy of the time synchronization signal directly affects the accuracy of the phase angles' and the phase angle differences measured by different phase testers. The phase angle of any two points of the same feeder in the power system may vary within a small range, depending on the length of the feeder and the load flow ’, but the angle difference is generally less than 10%. Under these circumstances, if the minimum required angle variable is one. , Then its measurement accuracy must be greater than 0. Γ to meet the requirements. However, due to recent technological breakthroughs and the development of satellite communications, the accuracy of the time synchronization signal can reach the range of 1 microsecond. In a 60Hz power system, the error of a microsecond is equivalent to 0.022 °, far exceeding the actual Demand. Based on the current technical considerations, the present invention uses a Global Positioning System (GPS) signal receiver to complete the reference for synchronous sampling, and receives the time synchronization signal transmitted by the GPS satellite, as a difference between different locations. The trigger signal of the tester to achieve the purpose of synchronous measurement. The NAVSTER satellite system [9] was officially used by the United States Air Force in 1974. These satellites are components of the Global Positioning System (GPS). In the final structure, there will be 24 satellites working in 3 orbits with a height of 10898 miles. At any time and place in the world, 6 to 11 satellites can be seen at the same time at a field of view 5 degrees above the horizontal. Applicable to China National Standard (CNS) A4 Zhu Yi (21〇 × 297 mm) (Please read the notes on the back before filling out this page) Clothing-Order the invention description printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs (these health reception signals , As a reference for aviation navigation position and its meteorological data. The position of the object can have an accuracy of 10 meters in three degrees of space. Here we are only interested in the time signal transmitted by it. Notes on reading back φ The accuracy of the time signal received by the re-receiver can reach the ratio of i to porphyry. Refer to Figure 6 for a GPS receiver and its output signal diagram. The present invention uses the 1 PPS signal provided by the satellite and Sampling the time scale δ # of the pulse wave to complete the synchronized phasor measurement at different locations for the purpose of phase discrimination. Phasor calculation and signal processing unit Central of the Ministry of Economics? The company printed and then referred to Figure 7, showing a block diagram of the phasor operation and signal processing unit U and the signal conversion unit 3. The phasor operation and letter of the phase difference tester „The unit n mainly includes a microprocessor nD: may Use cpu template to control and process the 丄 pps synchronization number of GPS signal receiver 12 and time-stamped signal of sampling pulse; data acquisition system ⑴: includes # A / D and]) / A converter The digital signal processor (DSP) can receive the sampling and processing of the analog voltage signal of the signal conversion unit 13 and hold: and calculate the voltage phasor; and the data buffer 112: temporarily store the result of the phase calculation. In addition, the phase Quantitative calculation and signal processing unit ^ may further include a display 14 (see Fig. 2): displaying the result of phasor calculation = and displaying a series of communication templates (not shown): For communication between computers, the result of the phasor calculation is transmitted to the main brain. The voltage signal of the feeder is taken into consideration through the secondary side of the PT or the high-voltage test rod, and sent to the phasor calculation through the isolation and filtering of the No. 5 conversion unit 13. With letter

Printed by the Consumers Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7, V. Sample and hold (S / Η) circuit of processing unit 11 of invention description (13). The aforementioned filter circuit is designed to be half the sampling frequency to filter out aliasing signals and avoid errors when calculating phasors. After these analog voltage signals are sent to the S / Η circuit, a synchronous sampling signal is sent from the satellite signal receiver 12 to the S / Η circuit 'to keep all the voltage analog signals in the S / Η circuit via the multiplexer ( multiplex.) and analog-to-digital converter (Α / Ι) Converter), all analog signals are converted into digital signals, and then stored in the data buffer 112, and then these sampled data through the recursive decentralized Fourier transform (Recursive DFT) Calculate the phasor of the voltage and use it as a feeder to phase. The time stamp (t ime_stamp) ja provided by the satellite signal receiver 12 is time-taged before the mother sample data and phasor, and sent by the receiver 12 to the microprocessor pps (pulse per second) signal, providing a reference for the number of samples (sample numbe〇 reset. In a system with a sampling frequency of 72 Hz, the number of samples per second varies from 0 to 719. The number of samples for each phase tester 0 and 1 ? Generated from time to time. This number of samples is also accompanied by the format of each sampled data. Therefore, the voltage phase angles measured by different phase testers can be compared by time tag (time_tag) and number of samples (new number). The phase angle of the measured voltage can be displayed on the display, or the results of the phasor calculation can be transferred to the host computer for serial phase determination through the serial communication template. The present invention further provides- A phase difference test method is used to measure the phasor difference between two points of signals on the power feeder. The steps include the following: 1_ Use GPS Global Positioning System GPS positioning at the two points on the power feeder (please read first) Back of Precautions to fill out this page)

-------In J ^ ---- 1 —Ί —J- n I

Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs ~~ -—_____ Β7 1 ι 5. Description of the Invention (ΐ4) The time card receives the synchronous time signal 'to obtain the synchronous sampling signal; 2. The high-voltage test rod is used to convert the power feeder The voltage or current at the measurement point No. 4 is the measurement signal; 3. The foregoing measurement signal is sampled and held, and the phasor of the measurement signal is calculated by recursive Fourier transform; and 4. According to the aforementioned power The phase angle difference of the phasors measured at two points on the feeder determines whether the phase difference between the aforementioned two points signals is the same. In the embodiment of the present invention, the phase-to-phase test system responds to aging, and can be a personal computer-based (PC-Based) workstation, a single chip with computing capability, or use ASIC to plan phase-to-phase differences. The phasor calculation and signal processing unit of the tester, combined with the satellite positioning card and the Korean test rod, complete the hardware architecture. In one embodiment of the present invention, the existing equipment ADX3000 accident recorder can be used to implement the phasor operation and signal processing unit. The main consideration factor is that the ADX3000 accident recorder is a power measurement instrument built on a personal computer. In recent years, due to the rapid growth of computer hardware, and the price has dropped year by year, satellite positioning cards used in personal computers have also emerged. Therefore, the satellite positioning time synchronization signal can be transmitted through the bus of the personal computer, allowing the ADX300 accident recorder to do Synchronous measurement. The digital signal processing (DSP) unit on the ADX3000 accident recorder is used to calculate the required power phasor to determine the phase sequence of the feeder. The following is an overview of the ADX3000 accident recorder and satellite positioning card. The ADX3000 accident recorder in the current measuring instrument 'converts the original amount of the AC voltage / current / number' through a digital mathematical operation method to obtain the required (CNS) A4 »(210 × 297 ^ Τ ~ ·-^ ~ ^ '(Read the notes on the back before filling in this page)

Printed by the Employees' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs A7 ---: _________B7 V. Description of Invention (15) '~~': --- Electricity data is a new development trend. Various related mathematical operations / processing formulas have been used in recent years with the rapid development of electronic technology, and have been widely used in 2-force products equipped with microprocessors (or DSp), such as smart digital meters Digital relay station, power 1 · test state 4. And this accident recorder also uses many mathematical calculations / processing formulas. ADX3000 accident recorder [10] is a power quality analyzer with transient and steady-state measurement functions, which can simultaneously measure harmonics / voltage Min 烨 and thunder force parameters. In order to meet the above requirements, in addition to 'Signal synchronization' Time synchronization, in addition to large storage capacity 'also need to have strong and powerful computing processing capabilities. Because the Digital Signal Processor (DSP) has a faster computing capability than a general-purpose microprocessor, and is suitable for a large number of matrix operations. The ADX3000 accident recorder uses a digital signal processor as the core as the processing center and has the following four characteristics: 1. Asymmetric Multiprocessor Architecture 〇 2. Reloadable operation System (Reloadable Operating System) ° 3. Non-stop Double Data Buffer. 4. Resource Sharing. The input part of the signal is divided into four units, and each unit can receive eight digital and analog input signals. The digital input signal is dry contact type; while the analog input signal receiving range is +/- 10V, through appropriate current / voltage converter (CT / PT), current / voltage conversion. This paper is suitable for China. Standard (CNS) A4 ^ (210X297 mm) (read the notes on the back and then fill out this page) Send-Order printed by the Consumer Standards Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs A 7 _B7_ 'V. Description of the invention (16) Transducer or high voltage test rod, can receive high / low voltage AC current or voltage. The output part of the steady state data record, such as the RMS value of AC voltage / current, phase angle, power, power factor, imbalance factor, etc., the RMS value of harmonic voltage / current, phase angle, power, power factor, etc., and Various related data such as voltage flicker. As for the transient recording part, all the above-mentioned data can be obtained by the calculation of the transient original data of AC voltage / current, and the transient recording is planned to record the inputted raw data. Please refer to Figure 8 for the basic structure of the ADX3000 accident recorder. The main body of the device can be roughly divided into three parts: data collection card, data temporary storage card, and main controller. 1. Data collection card: Each card is responsible for collecting the digital and analog synchronous data of eight channels. A maximum of four pieces can be inserted into one machine, that is, the digital and analog signals of 32 channels can be input at the same time. In terms of transient recording, responsible for triggering digital and analog signal triggers, formula triggering, and transmitting data to the data register; in steady state recording, responsible for converting raw data into various harmonics or voltage flicker related The data is transmitted to the master controller for work. 2. Data temporary storage card: Each machine is equipped with a non-stop data dual temporary storage device with 8M bytes X 2 and an accurate clock. It generates accurate clock signals, allows the four data collection cards to collect the original data simultaneously, and stores the original data from the data collection cards into a temporary storage device. At the same time, the paper size applies the Chinese National Standard (CNS ) Α4 frame (210 X 297 mm) (Please read the notes on the back of Min Min before filling this page)

Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs of the 1T A7 B7 'V. Description of the invention (17) is also responsible for the coordination between the main controller and the four data collection cards. In terms of transient recording, it is also responsible for converting raw data into various types of power quality data for dynamic display; while in steady state recording, it is responsible for converting raw data of AC current / voltage into various phasors (phasor) data for further calculations. 3. Main controller part: In order to consider the ability of complete text / graphic display, keyboard input, data storage, data communication, etc., the main controller uses a 486 single-board PC with one tablet per machine. Therefore, the ADX3000 accident recorder has the units and functions required by the phase difference tester of the present invention, and can be used to implement a phasor operation and signal processing unit. 11 ° Satellite positioning card Global Satellite Positioning System (GLOBAL POSITIONING SYSTEM: GPS) The Ministry of National Defense was developed in response to the needs of national defense and civilian navigation and positioning. It is a system that uses 24 artificial satellites to launch microwaves around the earth at an altitude of 20,000 kilometers to provide navigation and positioning. You can use the absolute time and pulse signal from the GPS receiver card to achieve the time synchronization of signal measurement between different instruments. The error in synchronization time can reach +/- 1 με. Figure 9 shows the functional block diagram of the satellite time card. The main requirements for consideration are: The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 × 297 mm) Page) Assembling and ordering A7 A7 18, invention description (; · combination of f1 and GPS receiver card hardware interface. • Erhe uses the absolute time transmitted by GPS receiver card. Please read the precautions of it before filling out this page • How to use the pulse signal per second from the GPS receiving card. • How to improve the synchronization of each data sample of different instruments. Apply the signal sent by the GPS receiving card: υ pulses per second, serial output in absolute time 3) After processing and designing the time-positioned time card at the place where it is located, it can provide the following functions: re-operation, accurate clock (time resolution is Q. 丨 post, time accuracy is 仏 Ιμε). 2. Accurate pulse per second (PPS), the error is less than + / _ 丨 卯. 3. Synchronous and accurate A / D sampling pulse (maximum accumulated error is less than 0.lms @ scan rate = 720). Order 4. Latitude and longitude where it is located. 5 · A set of master_slave can be established by using a multi-axis electron microscope cable. · Only an antenna and a satellite receiver are required at the master station (GPS receive, the rest are located within hundreds of meters (between stations) Each station can be equipped with a time-of-day card without a satellite receiver, connected by multiple axes, which can achieve the above-to complete the four rhymes. Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs In addition, MC in Figure 9 refers to «Joint or Secret 2 serial communication connector, and ppS is one pulse per second. Through the intelligent timing control unit, GPS satellite positioning time card can achieve many accurate sampling accuracy at many sampling rates. Table 1 is for + The maximum cumulative error of the twenty sampling rates used. For example, 卩 72Q = which is ^ Frequency operation relative tester, the maximum cumulative error is 0._ms, relative to the paper size applies Chinese National Standard (CNS) A4 grid ( 210X297 mm) A7 B7 V. Description of the invention (19) The error of the phasor motor angle is 1. 922 degrees, and the accuracy of the application of the phase test is far beyond the actual requirements. Table 1 Sampling frequency of the maximum time cumulative error table Main frequency multiples Dual frequency clock pairings Maximum cumulative error 60 1 2,1 0.067ms 120 2 1,2 0.067ms 180 3 5,4 0.222ms 240 4 2,1 0.067ms 300 5 1,2 0.067ms 360 6 7 , 2 0.156ms 600 10 2,1 0.067ms 720. 12 8,1 0.089ms 1200 20 1,2 0.067ms 1440 24 4,5 0.222ms 2880 48 2,7 0.156ms 3000 50 1,2 0.067ms 3840 64 1 , 5 0.083ms 6000 100 2,1 0.067ms 7200 120 8,1 0.089ms 7680 128 U1 0.092ms 1024 * 5,3 0.188ms 2048 氺 13,3 0.244ms 4096 氺 13,19 0.772ms 8192 氺 45,19 1.336 ms (Please read the notes on the back before filling this page)

1T € One of the embodiments of the invention printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs is to use the ADX3000 accident recorder, combined with GPS satellite positioning time card and face pressure test rod (40Kpeak) to complete the phase difference tester 10, the In addition to the timeliness of the completed tester, the existing ADX3000 accident recorder also provides the function of synchronous sampling, which measures the steady-state power quality at different points on the site, because the stored data has a synchronized time reference, which is convenient for accidents. Analysis and judgment. This paper standard uses Chinese National Standard (CNS) A4 (210 × 297 mm). In the power distribution automation project of the company developed by the research of this invention, the heart-shaped benefits are mainly due to the fact that the feeders must be properly installed in the feeders. If the system is set to operate, the system malfunctions, and the power supply is prevented from being installed in the wrong sequence. As a result, the testers Zeng Huaka and Weizhi Iron and Steel from the Chiayi Substation in the Jianan Power Supply District have been tested. The selection and role of the communication station of the power station and its users_. b hundred. The following will introduce the principle of the phase difference test of the present invention-the voltage phase angle of a known phase sequence. Zheng Kao will measure the phase angle of the Xixitai special phase and compare it with another unknown phase sequence. Based on this, it is judged that the test room needs to be used to test the deer in two phases. It is useful to measure the deer in two different locations, and to measure at different locations: Apply T to complete the use of different communication media, such as microwave, wireless interphone And wireless phones, etc. ° Exam. It can be said that the present% of the operating personnel are here to present the work experience and results of the present invention: (1) All participants participating in the on-site measurement are divided into two groups A and _, and are rammed into Langzhong Substation. Instrument operation and testing. The source side is used as the reference point, and a high decay bar is used to reduce the power side voltage of Taichung # 1MCB 电 # 1MCB to 11.4KV / decrease (just double). The tester's # 1GA27CB load side) also uses the high-end test terminal (post-stage input phase tester. The test in this part _ = rod will attenuate the signal n mainly to verify that this paper standard applies to the Chinese national standard (CNS ) A4 specification (210x297 mm) A7 B7 V. Description of the invention (21) Accuracy of using a high-voltage attenuation bar (ie, voltage signal). The test results are shown in the test records in Table 2. (2) Then take the Taichung # 1 GA27CB power supply side, Take the voltage signal from the high-voltage attenuation bar as a reference to test the accuracy of the wound CT. At this time, the winding CT is used to measure the phase angle of the current on the load side of # 1MCB and the voltage on the power side of # 1 GA27 CB in Taichung Phase angle comparison to determine the difference. Test records are shown in Table 3. (Please read the precautions on the back before filling this page) .. Stupid-

'1T Ministry of Economic Affairs Central Standards Bureau employee consumer cooperative printed test record form III Test time Taichung # 1 GA27 CB power side (using PT) Non-benchmark test point (using CT) Minimum phase difference discriminant judgment δ shell \ hours, minutes , Second marked angle R2 S2 T2 non-gang township \ test record table two \ standard Na 1 angle. X test time table # 1 MCB power side (using PT) non-reference test point (using PT) minimum phase angle difference discrimination ， Minutes, Seconds, Angles, Angles, Angles # 1GA27 CB in the platform 14, 08, 50 R1 9-1 · S R2 Π2. 2 2.6 R2 = R1 14,11, 04 -85.2 S2 54.0 14, 31, 56 -168.7 T2 73.2 ， 32 S1 47.6 R2 -71.1 1.4 S2 = S1 ， 12 fi. 1 S2 7.8 ， 38 40.2 T2 161.9 ， 14 T1 5.8 R2 126.8 1.4 T2 = T1 ， 44 164.0 S2 45.0 0 ', 10- 8.2 T2 6 · 8 Note: Take the # 1MCB power side in Taichung as the benchmark. This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) A7 B7 V. Description of the invention (22) ~~ ^ 4 # 1MCB negative—Γ56 " Cutting side ^ 724 " 2 ~ ct R1 -136; S1 'πΤ Τ1 ~ 8. *, £ 4 1-156.8 1 — 1 -30.8 87.2 20.4 R2 = R1 _ Τ23 · 4 101.6 -140.6 14.8 S2 = S1 9. 1-78.7 45.9 _ 17.4 T2 = T1 Note: This test record is based on the Taichung # 1GA27CB power supply side as the benchmark. The consumer cooperation cooperation of the Central Ministry of Economic Affairs of the Ministry of Economic Affairs is printed in detail. After explaining the preferred embodiment of the present invention, those skilled in the art can clearly understand it, and can make various changes and modifications without departing from the scope and spirit of the patent application described below, and this creation is not limited to the implementation of the description Example implementation. [Effect of the invention] The phase difference test system implemented according to the present invention will overcome the difficulties in the conventional technology and provide a high reliability phase difference test system. Its achievements include: (1) solving the power company's distribution feeder Oppositional issues in automated systems. (2) It can be used to establish load data of transmission and distribution feeders, and provide correct data to the load management system. (3) Solve the current imbalance of power distribution feeders, and make a judgment when the improvement is needed. (4) The function of live working of this phase-specific testing device does not affect the normal power supply of the system. To sum up, this creation has many excellent characteristics, and solves the shortcomings and inconveniences of conventional technology in practice and application. It proposes an effective solution 'complete a practical and reliable device, and then achieve a new value with economic benefits' It has already met the application requirements for invention patents. We sincerely hope that the Bureau can examine it in detail and grant quasi-patent rights protection in order to benefit people's livelihood. This paper size applies to China National Standard (CNS) A4 (210X297 mm) (please read the precautions on the back before filling out this page)-installed., Ιτ Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs A7, B7 V. Description of the invention (23) F: \ E2 \ WIN WORD \ 98P0068.DOC < Word97 > Reference [1] AGPhadke, T. Hlibka and M. Lbrahim, " Fundamental Basis for Distance Relaying with Symmetrical Components " IEEE Transactions on power Apparatus and System, March / April 1977, pp. 635-646.

[2] J.S. Thorp, A.G. Phadke and K.J. Karimi, " Real-time Voltage Phasor Measuremeents for Static Estimation ", IEEE Transactions on power Apparatus and System, November 1985, pp. 3098-3107, pp. 233-251.

[3] N. Rostamkolai, A.G. Phadke, J.S. Thorp and W. F 丄 ong, " An Adaptive Optimal Control Strategy for Dynamic Stability Enhancement of ACDC Power Systems "; Presented at the IEEE Summer Power Meeting, July 1987.

[4] J.S. Thorp, A.G.Phadke, S.H.Horowitz and M.M.Begovic, " Some Applications of Phasor Measurements to Adaptive Protection ", presented at the Power Industry Computer Applications Conference PICA May 1987.

[5] J.S. Thorp and W.S.Ma, " Adaptive Relaying based on stability Prediction ", presented at the Computer Relaying Conference, Blacksburg VA, October 1987.

[6] AGPhadke, MMBegovic, VACenteno and V. Phaniraj, " Clock Synchronization for Improved Monitoring, This paper size applies to China National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before (Fill in this page)

, TT A7 B7 V. Description of the invention (24)

Protection and Control ", IEEE Trans, on Power Apparatus and System.

[7] W.A.Flowers, " Phase Angles displayed for dispatcher ", Electrical World, pp. 48-49, May 1973.

[8] G. Missout, P. Girard, " Measurement of bus Voltage angle between Montreal and Sept-Iles ", IEEE Trans, on Power Apparatus and Systems, Vol. PAS-99, No.2, pp. 536-539 , March / April 1980.

[9] " Global Positioning System ", Volumes I, II and III, Papers published in Navigation, reprinted by the Institute of Navigation, Washington, D.C, 1980.

[10] Jiang Rongcheng, Liao Qingrong, Wu Wenqiang, "Development and Research of Multifunctional Power Quality Analyzer,", Taipower Engineering Monthly, ρρ · 6-21, Vol. 568 December, 1995. (Please read the precautions on the back before (Fill in this page) Binding and ordering the printed paper by the staff of the Central Bureau of Standards, Ministry of Economic Affairs, ^ Applicable to China National Standards (CNS) A4C ^ · (210X297 mm)

Claims (1)

Members are kindly requested to state clearly whether the original facts will be changed after the amendment of this case ^! &Quot; -Printed by the Consumers' Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs-. 6. Application for Patent Models I ..., MΪ The measurement of the phasor of any two points of signals on the power feeder line is different, and mainly includes: a synchronization signal receiving unit that receives a synchronization time signal and outputs a synchronous sampling signal; a signal conversion unit that converts the aforementioned signal of the power feeder line into a measurement signal; '' A communication unit for transmitting the data communication between any two points on the aforementioned power feeder; and a phasor operation and signal processing unit that receives the aforementioned synchronous sampling signal to sample and hold the aforementioned measurement signal, and calculates the aforementioned quantity by a predetermined operation formula The phasor of the signal is measured, and the communication unit determines the difference between any two points of signals on the power feeder. It is the phase difference test system as described in item 1 of the scope of patent application, wherein the predetermined calculation formula is a recursive Fourier transform. '3. The phase difference test system described in item 1 of the scope of patent application, wherein the phasor operation and signal processing unit includes a microprocessor, a digital signal processor, and a data buffer. 4. The phase difference test system described in item 1 of the scope of patent application, wherein the signal of the aforementioned power feeder is a voltage signal. 5. The phase difference test system described in item 1 of the scope of patent application, wherein the signal of the aforementioned power feeder is a current signal. .6. The different test system as described in item 1 of the scope of patent application, in which the paper size is synchronized with the Chinese National Standard (CNS) A4 specification (21〇 × 297 mm) (please read the precautions on the back first) (Fill in this page) Members are requested to state clearly whether the original facts will be changed after the amendment of this case ^! &Quot; -Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs-. 6. Application for Patent Models I ..., ΜΪ 1. A kind of relative test The system is used to measure the phasor of any two points of signals on the power feeder to determine the difference. It mainly includes: a synchronous signal receiving unit that receives a synchronous time signal and outputs a synchronous sampling signal; a signal conversion unit that converts the signal of the aforementioned power feeder into Measurement signal; 'a communication unit for transmitting data communication between any two points on the power feeder; and a phasor operation and signal processing unit that receives the synchronous sampling signal to sample and hold the measurement signal, and uses a predetermined calculation formula. The phasor of the measurement signal is calculated, and the communication unit determines the difference between any two points of signals on the power feeder. It is the phase difference test system as described in item 1 of the scope of patent application, wherein the predetermined calculation formula is a recursive Fourier transform. '3. The phase difference test system described in item 1 of the scope of patent application, wherein the phasor operation and signal processing unit includes a microprocessor, a digital signal processor, and a data buffer. 4. The phase difference test system described in item 1 of the scope of patent application, wherein the signal of the aforementioned power feeder is a voltage signal. 5. The phase difference test system described in item 1 of the scope of patent application, wherein the signal of the aforementioned power feeder is a current signal. .6. The different test system as described in item 1 of the scope of patent application, in which the paper size is synchronized with the Chinese National Standard (CNS) A4 specification (21〇 × 297 mm) (please read the precautions on the back first) (Fill in this page) The signal receiving unit contains a satellite positioning time card. 7.-Special phase H '㈣ Measure the phasor of the signal on the power feeder, which mainly includes: Synchronous signal receiver' receives the synchronous time signal and outputs the synchronous sampling signal; k converter converts the aforementioned power feeder The signal is a measurement signal; and the relative operation and signal processing device includes a microprocessor, a digital signal processor, and a data buffer, and can receive the aforementioned synchronous sampling signal to sample and hold the aforementioned measuring signal, and use a predetermined operation formula. Calculate the phasor of the aforementioned measurement signal. 8. The phase difference tester as described in item 7 of the scope of the patent application, wherein the synchronization signal receiver includes a satellite positioning time card. 9. The phase difference tester as described in item 7 of the scope of patent application, wherein the predetermined operation formula is a recursive Fourier transform. 10. The phase difference tester as described in item 7 of the scope of patent application, wherein the aforementioned phasor calculation and signal processing device further includes a communication interface, so as to rotate out the data of the aforementioned phasor calculated. 11. The phase difference tester as described in item 7 of the scope of the patent application, wherein the front phasor calculation and signal processing device further includes a display to display the calculated data of the aforementioned phasor. 12. The phase difference tester as described in item 7 of the scope of patent application, in which the aforementioned Zhu paper standard is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm). The signal receiving unit includes a satellite positioning time card. 7.-Special phase H '㈣ Measure the phasor of the signal on the power feeder, which mainly includes: Synchronous signal receiver' receives the synchronous time signal and outputs the synchronous sampling signal; k converter converts the aforementioned power feeder The signal is a measurement signal; and the relative operation and signal processing device includes a microprocessor, a digital signal processor, and a data buffer, and can receive the aforementioned synchronous sampling signal to sample and hold the aforementioned measuring signal, and use a predetermined operation formula. Calculate the phasor of the aforementioned measurement signal. 8. The phase difference tester as described in item 7 of the scope of the patent application, wherein the synchronization signal receiver includes a satellite positioning time card. 9. The phase difference tester as described in item 7 of the scope of patent application, wherein the predetermined operation formula is a recursive Fourier transform. 10. The phase difference tester as described in item 7 of the scope of patent application, wherein the aforementioned phasor calculation and signal processing device further includes a communication interface, so as to rotate out the data of the aforementioned phasor calculated. 11. The phase difference tester as described in item 7 of the scope of the patent application, wherein the front phasor calculation and signal processing device further includes a display to display the calculated data of the aforementioned phasor. 12 · The phase difference tester as described in item 7 of the scope of patent application, in which the aforementioned Zhu paper standard is applicable to China National Standard (CNS) A4 (210X297 mm) The signal from the power feeder printed by the Central Consumers Association of the Ministry of Economic Affairs and the Industrial Consumer Cooperative is a voltage signal. 13 The phase difference tester according to item 7 of the scope of patent application, wherein the signal of the aforementioned power feeder is a current signal. 14. A phase separation test method for measuring the phase difference between two points of signals on a power feeder, including the following steps: receiving a synchronization time signal at the two points on the power feeder to obtain a synchronous sampling signal; converting the power The feeder signal is a measurement signal; the synchronous measurement signal is used to sample and hold the measurement signal, and the phasor of the measurement signal is calculated by a predetermined calculation formula; and the phasor measured at two points on the power feeder The phase angle is different to determine the phase difference between the two signals. 15. The phase difference test method as described in item 14 of the scope of patent application, wherein the predetermined operation formula is a recursive Fourier transform. 16. The phase difference test method according to item 14 of the scope of patent application, wherein the phase angle difference is smaller than a predetermined value ', it is determined that the phase difference of the two points is the same. 7. As described in item 14 of Shenqing's patent scope, where the two-phase phase difference between three phases at two points on the power feeder is measured, the three-phase phase A4 specification (21 〇χ297 mm) can be determined- ------ Equipment-乂. · ----- (Please read the precautions on the back before filling out this page) Order 4 六 、 Application for patent park The signal from the power feeder printed by the Central Consumers Association of the Ministry of Economic Affairs and the Industrial Consumer Cooperative is a voltage signal. 13 The phase difference tester according to item 7 of the scope of patent application, wherein the signal of the aforementioned power feeder is a current signal. 14. A phase separation test method for measuring the phase difference between two points of signals on a power feeder, including the following steps: receiving a synchronization time signal at the two points on the power feeder to obtain a synchronous sampling signal; converting the power The feeder signal is a measurement signal; the synchronous measurement signal is used to sample and hold the measurement signal, and the phasor of the measurement signal is calculated by a predetermined calculation formula; and the phasor measured at two points on the power feeder The phase angle is different to determine the phase difference between the two signals. 15. The phase difference test method as described in item 14 of the scope of patent application, wherein the predetermined operation formula is a recursive Fourier transform. 16. The phase difference test method according to item 14 of the scope of patent application, wherein the phase angle difference is smaller than a predetermined value ', it is determined that the phase difference of the two points is the same. 7. As described in item 14 of Shenqing's patent scope, where the two-phase phase difference between three phases at two points on the power feeder is measured, the three-phase phase A4 specification (21 〇χ297 mm) can be determined- ------ 装-乂. · ----- (Please read the precautions on the back before filling out this page) Order 4