CN1330969C - Power frequency parameter tester and testing method for high tension transmission line - Google Patents
Power frequency parameter tester and testing method for high tension transmission line Download PDFInfo
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- CN1330969C CN1330969C CNB2004100417834A CN200410041783A CN1330969C CN 1330969 C CN1330969 C CN 1330969C CN B2004100417834 A CNB2004100417834 A CN B2004100417834A CN 200410041783 A CN200410041783 A CN 200410041783A CN 1330969 C CN1330969 C CN 1330969C
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Abstract
The present invention relates to a line-frequency parametric tester suitable for high voltage transmission lines, which belongs to the technical field of power supply test. The tester comprises a CPU module, an, IPM module, a filter circuit, a three-phase transformer, output samplings, a control module, an AD converting circuit, a drive circuit, an analogue quantity processing module, a liquid crystal screen and a frequency-shift signaling generation module composed of a phase locked loop circuit chip, a frequency divider and a programmable logic circuit chip. The phase locked loop circuit is connected with a line-frequency signal externally, a frequency doubling high-frequency signal obtains a frequency-shift signal through the programmable logic circuit chip, and the frequency-shift signal is connected with the filter circuit after power amplification by the IPM module; the programmable logic circuit chip is communicated and connected with the CPU module. The present invention avoids the influence to the measure brought by a line-frequency interference signal, and the volume and the weight of an instrument required to the test are greatly reduced. The present invention has advantages of compact structure, exact measure and convenient operation; the present invention can also greatly reduces the work load of the test, enhances the work efficiency, and brings maximum convenience for the field test.
Description
Technical field
The present invention relates to a kind of tester, especially a kind of power frequency parameter test instrument that is applicable to ultra-high-tension power transmission line the invention still further relates to the power frequency parameter test method of ultra-high-tension power transmission line simultaneously, belongs to the power supply technical field of measurement and test.
Background technology
Measure the ultra-high-tension power transmission line power frequency parameter at present on the engineering and need use powerful three-phase transformer, pressure regulator, after applying power-frequency voltage on the test line, by discrete meter meters such as reometer, voltage table, power meters, respectively show scale and after corresponding computing, try to achieve each parameter value by reading.The volume and weight of testing tool is bigger, and the connection complexity between each table meter needs artificial reading and deal with data, need change when measuring different parameters and measure wiring and instrument wiring, and testing experiment is loaded down with trivial details.
Retrieval finds, the Chinese patent that application number is 01254118.4, the applying date is October 11 calendar year 2001 discloses that a kind of CPU of comprising, analog quantity handle, the digital harmonic voltage factor tester of AD conversion, display device.Use for reference this type of prior art, realize that the isoparametric detector of voltage is not difficult.For example, if power supply signal is connect filtering circuit through the IPM module, output with filtering circuit connects load by output sampling and controlling unit behind transformer again, output sampling simultaneously and controlling unit also connect the signal input part of CPU by analog quantity processing and AD modular converter, the shows signal output termination display device of CPU just can realize certain test function.
Yet, during the power frequency parameter of routine measurement ultra-high-tension power transmission line, must use the test signal more much bigger when the existence that power frequency is disturbed requires test, for test has brought very big trouble than undesired signal.If adopt the shift frequency power signal to measure, can avoid power frequency to disturb the adverse effect that test is brought, but must solve the synchronous and shift frequency problem of measuring-signal and power frequency component, could after power amplification, use like this for measuring.Therefore all unresolved this problem of above prior art fails to realize the conveniently power frequency parameter test of ultra-high-tension power transmission line.
Summary of the invention
The objective of the invention is: at the defective of above existing situation existence, solve the synchronous and shift frequency problem of input signal by taking measures, propose a kind of compact conformation, measure accurate, easy to operate ultra-high-tension power transmission line power frequency parameter test instrument, thereby provide the method that the synchronous and shift frequency problem that solves input signal realizes the ultra-high-tension power transmission line power frequency parameter test simultaneously.
In order to reach above purpose, ultra-high-tension power transmission line power frequency parameter test instrument of the present invention comprises CPU module, IPM module, filtering circuit, three-phase transformer, output sampling and control module, A/D convertor circuit, driving circuit, analog quantity processing module and liquid crystal display, the output of described filtering circuit is connected with output sampling and control module through three-phase transformer, the signal output part of described output sampling and control module is handled and the AD modular converter connects the signal input part of CPU through analog quantity, and the shows signal of described CPU is exported the termination display device.In addition, also comprise frequency-shift signaling generation module, described frequency-shift signaling generation module mainly is made of phase-locked loop circuit chip, frequency divider, Programmable Logic Device chip as frequency multiplication, the external power frequency component of described phase-locked loop circuit chip, high-frequency signal output after its frequency multiplication links to each other with the input end of Programmable Logic Device chip, the frequency-shift signaling that obtains after the Programmable Logic Device chip is handled connects the input end of IPM module, connects described filtering circuit after the IPM modular power amplifies; Described Programmable Logic Device chip is connected with the described CPU module communication of sending controling instruction.
Corresponding ultra-high-tension power transmission line power frequency parameter test method is: in the tester of mainly being made up of CPU module, frequency-shift signaling generation module, IPM module, filtering circuit, three-phase transformer, output sampling and control module, A/D convertor circuit, driving circuit, analog quantity processing module and liquid crystal display, described frequency-shift signaling generation module comprises phase-locked loop circuit chip, Programmable Logic Device chip, under described CPU module controls, testing procedure is as follows:
1) power frequency component input phase-locked loop circuit chip obtains high-frequency signal after frequency multiplication;
2) high-frequency signal is input to the Programmable Logic Device chip, obtains frequency-shift signaling after treatment;
3) frequency-shift signaling is input to the IPM module, after power amplification the frequency-converter power signal conveys is arrived filtering circuit;
4) the high-frequency harmonic composition in the filtering circuit filtering frequency-converter power signal is transported to output sampling and control module by isolating three-phase transformer;
5) output sampling and control module output to load with frequency-shift signaling, and voltage, the current signal of output are sampled;
6) simulating signal of sampling and obtaining is transported to the analog quantity processing module;
7) simulating signal after will handling is transported to the CPU module through the AD conversion;
8) CPU module output shows test results on display device.
During use during tester, test lead external load with output sampling and control module, select to confirm measuring operation by the menu that shows on the liquid crystal display by knob, instrument applies the shift frequency measuring-signal automatically to tested load, the signal of sampling is through respective handling and after calculating, measurement result is presented on the liquid crystal display by CPU, can selects to preserve or print by the tester in case of necessity.
Because the present invention has rationally solved the synchronous and shift frequency problem of input signal, therefore reduced the influence that power frequency interference signals is brought measurement, avoided needing in the classic method to measure the adverse effect of bringing to site test than high-power signal, the volume and the weight of instrument have been reduced greatly, its compact conformation, measure accurate, easy to operate, can significantly reduce the test job amount, increase work efficiency, for site test brings great convenience.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing:
Fig. 1 is the measurement wiring schematic diagram of one embodiment of the invention.
Fig. 2 is the schematic block circuit diagram of Fig. 1 embodiment.
Fig. 3 is the frequency-shift signaling generation modular unit circuit theory diagrams of Fig. 1 embodiment.
Embodiment
Embodiment one
The ultra-high-tension power transmission line power frequency parameter test instrument of present embodiment, wiring schematic diagram is referring to Fig. 1 when carrying out the zero sequence impedance measurement.During measurement, only need the measuring lead wire of test line correctly is connected with the slotted line of instrument, after the operation, instrument can be measured calculating according to measuring the automatic output power of instruction, and measurement result is presented on the liquid crystal display, and is very convenient.
The schematic block circuit diagram of present embodiment as shown in Figure 2, comprise in the block diagram and realize each unit module and the interface relationship of wanting required for the present invention, wherein 0 is MB (motherboard) circuit board, 1 is cpu pcb, 2 is Signal signal generating circuit plate, 3 is the IPM circuit board, 4 is the LC filtering circuit, and 5 is transformer, and 6 are Rel ay output sampling and control circuit board, 7 are load Zx, 8 is liquid crystal display and knob, and 9 is the AD circuit board, and 10 is the IO drive circuit board, 11 is Deal analog quantity treatment circuit plate, and 12 is the Power power module.
The connection of above each several part and signal transitive relation are: associated circuit board (1,2,9,10,11,12) patches by a connector and MB (0) respectively, realize following the connection: cpu pcb (1) adopts PC104 high speed industrial computer as central processing unit, send steering order and carry out overall situation control, there are an interface and liquid crystal display LCD (8) to carry out communication, display routine interface and related data, and the instruction of the outer bound pair knob of reception; Signal signal generating circuit plate (2) as frequency-shift signaling generation module is inserted on the MB (0), under CPU module (1) control, produce frequency-shift signaling, and link to each other with IPM circuit board (3), carry out the shift frequency power signal and amplify (detailed description is seen below) by a connector; The shift frequency control signal that IPM circuit board (3) passes over according to Signal circuit board (2) produces the high-power frequency-shift signaling that is used to measure, and gives filtering circuit (4) and carries out waveform processing; High-frequency harmonic composition in the SPWM frequency-converter power signal that three-phase LC filtering circuit (4) filtering IPM (3) sends improves after the waveform quality, connects three-phase transformer (5); After isolating filtered IPM power signal, three-phase transformer Tr (5) connects Relay output sampling and control module (6); This Relay module (6) is exported control with the frequency-shift signaling after the transformer isolation, the state of the instruction control relay that transmits according to different measuring task and IO circuit board (10), the form in handover measurement loop, sensing lead Zx (7) parameter, and voltage, the current signal of output sampled, give Deal circuit board (11) with the secondary singal that obtains through cable and handle; Load Zx (7) links to each other with the output of Relay module (6), shift frequency voltage, current signal is introduced carried out measuring operation in the tested load; LCD liquid crystal display and knob (8) display routine interface, and send to CPU module (1) by the steering order that knob obtains by data line and respond; AD module (9) obtains the simulating signal that need are handled from MB (0), carries out correlation computations and processing in inside, gives CPU (1) with the result who obtains by the data line on the MB (0) and handles; IO driving circuit (10) is gone up the data command that transmits according to MB (0), drives the relay on the Reay module (6), the form in control survey loop; To sample from Relay module (6) voltage and current signal that obtains of Deal analog quantity disposable plates (11) carries out analog quantity and handles, and the simulating signal after will handling passes through MB (0) and give AD module (9), is input to cpu pcb (1).Power power module (12) is inserted on the MB (0), through MB (0) general+5V, ± 12V ,-power supplys such as 24V give each module.More than relevant module under the unified instruction control of CPU (0), according to the program of presetting, the response test task is finished measuring operation.
As the Signal signal generating circuit plate (2) of frequency-shift signaling generation module according to the instruction generation of CPU and the shift frequency measuring-signal of power frequency 50Hz signal Synchronization, key working part for the original creation of this instrument, physical circuit is as shown in Figure 3: the A unit is a phase-locked loop circuit, the B unit is the programmable logic chip circuit, the C unit is an eprom memory, the D unit is connector J2, the E unit is connector J1, the F unit is a power supply decoupling capacitance network, the G unit is charging voltage, current detection circuit, and the H unit is a reset circuit.
Wherein, phase-locked loop circuit (A) is used to follow the tracks of power frequency 50Hz signal, and according to steering order generation frequency-shift signaling, it is by two 74HC4046A phase-locked loop circuit chip U1 and U4, voltage comparator U3 and optocoupler ISO1,74HC4040 frequency divider chip U5, and resistance R 1～R13 and capacitor C 1～C4 composition.More than the circuit of each chief component connect and the signal transmission relation is: voltage comparator U3 and optocoupler ISO1 are used to 74HC4046A phase-locked loop circuit (U1 the 14th pin) that power frequency 50Hz square wave Clkin is provided signal, the high-frequency signal Clkl that its phase locking frequency multiplying obtains (Ul the 4th pin) links to each other with frequency divider signal input (U5 the 10th pin), and the low frequency signal Clkout (U5 the 1st pin) that obtains after handling through the U5 frequency division feeds back to phaselocked loop (U1 the 3rd pin); The frequency signal CLKl that while first order phaselocked loop (U1) frequency multiplication obtains links to each other with the programmable logic chip (U2 the 2nd pin) of B unit, the command signal that this signal is sent by CPU is controlled, processing obtains another frequency signal CLK2 through U3 chip internal digital circuit, introduce the input end (A unit U4 the 14th pin) of second level phase-locked loop circuit, introduce the Programmable Logic Device chip (U2 the 2nd pin) of B unit through the high-frequency signal CLK (U4 the 4th pin) that the second time, frequency multiplication obtained once more; The major function of Programmable Logic Device chip (B) is to be used for shift frequency power signal digital circuit to handle, and controlled by CPU control signal DB0～DB7 and AB0～AB3, produces shift frequency high frequency clock signal CLK and SPWM position signal A0～A19; The data that eprom memory (C) is used to store SPWM produce three-phase frequency-shift signaling PWM0～PWM5 under the control of A0～A19 signal, this signal is introduced in the Programmable Logic Device (B) and handled; Connector J2 (D) is 26 core flat cable data lines, be used for carrying out communication with the IPM circuit board, frequency-shift signaling UPWM1 (2), VPWM1 (2), WPWM1 (2) are carried out power amplification, simultaneously relay control signal Relayl (2) and direct current signal signals such as (PT, CT) are introduced Signal signal generating circuit plate; Connector J1 (E) is used for carrying out communication with MB, and Signal signal generating circuit plate is introduced or drawn to instruction and other coherent signal of CPU; Power supply decoupling capacitance network (F) is used to the circuit chip on the Signal signal generating circuit plate that a stable power is provided; Charging voltage, current monitoring control circuit (G) are used to detect DC voltage, the current signal of charge circuit; Reset circuit (H) is used to Signal signal generating circuit plate that an initial reset signal is provided, and is correct to guarantee the instrument original state.
When using the tester of present embodiment, as long as will export the test lead external load of sampling and control module, the tester is by liquid crystal display and handle knob and CPU communication, whole test is controlled get final product, and is very convenient.
In the above process, present embodiment adopts twice phase locking frequency multiplying design, thereby obtained high-frequency signal CLK, can produce the 45Hz synchronous (or 55Hz) frequency-shift signaling by the CLK signal with the 50Hz power frequency interference signals, supply with tester and handle, thus ingenious this key technical problem of shift frequency synchro measure that solved.
Present embodiment is a core with industrial computer PC104, use the high-speed AD module and carry out data processing, using high-power IPM module to carry out power produces and controls, adopt high-precision mutual inductor to carry out the multirange sampling, and various functional modules effectively are integrated in the same casing, only need the outside that 220V is provided AC power, test loop is correctly connected, can test.Whole instrument physical dimension: 500mm * 350mm * 370mm (length * wide * height), heavy 30kg, as shown in Figure 1, volume is little, and is in light weight, is convenient to transportation, on-the-spot easy to use.In addition, another characteristics are, can use the single-phase power signal, by the computing of preface impedance matrix, carry out the test of ultra-high-tension power transmission line three-phase main-frequency parameter.
In a word, the present invention realizes measurement function by adopting integrated measurement technology and shift frequency Anti-Jamming Technique, select according to the tester, can carry out the isoparametric measurement of coupling capacitance between the electromagnetic induction voltage, positive sequence impedance, zero sequence impedance, mutual inductance reactance, positive sequence electric capacity, zero sequence electric capacity, circuit of ultra-high-tension power transmission line, measurement result can be measured and show to instrument automatically; Adopt frequency-shift signaling, can reduce the adverse effect that the space power frequency interference signals is brought measurement.
Compared with prior art, have following outstanding advantages:
1, adopts the integrated measuring technology. The control of instrument collection, power stage, measurement calculates, The several functions such as Display and Print are integrated, according to the parameter testing project of selecting, and automatically output Power, sampling is calculated and the display measurement result. Use the present invention to carry out testing experiment, avoid The traditional measurement mode need the complexity of multiple instruments, instrument to connect and troublesome operation, do not need the people The part work and part study table does not need the artificial treatment data, has greatly simplified field trial, for on-the-spot high pressure is failed The test of electric line power frequency parameter test has brought very big convenience.
2, shift frequency Anti-Jamming Technique. Instrument obtains synchronously according to the frequency of power frequency interference voltage Corresponding 45Hz and 55Hz frequency signal obtain the shift frequency power signal according to this signal amplification Carry out parameter testing; By the impact of fourier algorithm filtering power frequency interference voltage to measuring, And calculate amplitude and the phase place of frequency-shift signaling, thereby the measurement result of obtaining. The method subtracts Little 50Hz power frequency interference signals needing in the conventional method have been avoided to the impact that measurement brings High-power signal is measured the adverse effect of bringing to field trial, has greatly reduced the body of instrument The long-pending weight that reaches is for on-the-spot ultra-high-tension power transmission line power frequency parameter test test has brought very big side Just.
3, simple to operation. Use the present invention, when carrying out various parameter measurement, need not Change the mode of connection of tested this side of transmission line of electricity, only need instrument is correct and test line company Connect, instrument automatic output power signal is measured and is calculated, shows after the startup measurement task Final result. During the traditional measurement mode, measure different parameter projects, as positive order parameter, Zero sequence parameter needs to change the mode of connection of this side, and changes the wiring of measuring instrument, by Read manually that each instrumented data converts and corresponding calculating after obtain measurement result; And use The present invention then need not to change this side joint line mode, only needs to select to confirm to get final product at menu, Instrument will be according to different test events, and automatic switchover test loop form is carried out line parameter circuit value Test calculates test result and shows as required printable test at liquid crystal display The result.
Claims (9)
1. ultra-high-tension power transmission line power frequency parameter test instrument, comprise the CPU module, the IPM module, filtering circuit, three-phase transformer, output sampling and control module, A/D convertor circuit, driving circuit, analog quantity processing module and liquid crystal display, the output of described filtering circuit is connected with output sampling and control module through three-phase transformer, the signal output part of described output sampling and control module connects the signal input part of CPU through analog quantity processing and AD modular converter, the shows signal output termination display device of described CPU, it is characterized in that: also comprise frequency-shift signaling generation module, described frequency-shift signaling generation module is mainly by the phase-locked loop circuit chip as frequency multiplication, frequency divider, the Programmable Logic Device chip constitutes, the external power frequency component of described phase-locked loop circuit chip, high-frequency signal output after its frequency multiplication links to each other with the input end of Programmable Logic Device chip, the frequency-shift signaling that obtains after the Programmable Logic Device chip is handled connects the input end of IPM module, connects described filtering circuit after the IPM modular power amplifies; Described Programmable Logic Device chip is connected with the described CPU module communication of sending controling instruction.
2. according to the described ultra-high-tension power transmission line power frequency parameter test of claim 1 instrument, it is characterized in that: described frequency-shift signaling generation module contains two-stage phase-locked loop circuit chip, the external power frequency component of described first order phase-locked loop circuit chip, the high-frequency signal output after its frequency multiplication links to each other with the input end of Programmable Logic Device chip; Another frequency signal that obtains after described Programmable Logic Device chip is handled links to each other with the input end of second level phaselocked loop; The output terminal of described second level phaselocked loop inserts described Programmable Logic Device chip once more, obtains the input end that frequency-shift signaling connects the IPM module after treatment.
3. according to the described ultra-high-tension power transmission line power frequency parameter test of claim 2 instrument, it is characterized in that: described frequency-shift signaling generation module also contains voltage comparator and optocoupler, and power frequency component links to each other with the input end of first order phase-locked loop circuit chip through voltage comparator and optocoupler.
4. according to the described ultra-high-tension power transmission line power frequency parameter test of claim 3 instrument, it is characterized in that: the high-frequency signal output of described first order phase-locked loop circuit chip feeds back to this phase-locked loop circuit chip through frequency divider.
5. according to claim 1,2,3 or 4 arbitrary described ultra-high-tension power transmission line power frequency parameter test instrument, it is characterized in that: described frequency-shift signaling generation module, A/D convertor circuit, analog quantity processing module, driving circuit patch with the CPU module communication by motherboard and are connected.
6, a kind of ultra-high-tension power transmission line power frequency parameter test method, in the tester of mainly forming by CPU module, frequency-shift signaling generation module, IPM module, filtering circuit, three-phase transformer, output sampling and control module, A/D convertor circuit, driving circuit, analog quantity processing module and liquid crystal display, described frequency-shift signaling generation module comprises phase-locked loop circuit chip, Programmable Logic Device chip, under described CPU module controls, testing procedure is as follows:
1) power frequency component input phase-locked loop circuit chip obtains high-frequency signal and handles through the Programmable Logic Device chip after frequency multiplication, obtains frequency-shift signaling;
2) frequency-shift signaling is input to the IPM module, after power amplification the frequency-converter power signal conveys is arrived filtering circuit;
3) the high-frequency harmonic composition in the filtering circuit filtering frequency-converter power signal is transported to output sampling and control module by isolating three-phase transformer;
4) output sampling and control module output to load with frequency-shift signaling, and voltage, the current signal of output are sampled;
5) simulating signal of sampling and obtaining is transported to the analog quantity processing module;
6) simulating signal after will handling is transported to the CPU module through the AD conversion;
7) CPU module output shows test results on display device.
7. according to the described ultra-high-tension power transmission line power frequency parameter test of claim 6 method, it is characterized in that: described frequency-shift signaling generation module contains two-stage phase-locked loop circuit chip, and described step 1) comprises
1-1) power frequency component input first order phase-locked loop circuit chip, the high-frequency signal after the frequency multiplication outputs to the Programmable Logic Device chip;
Another frequency signal input second level phaselocked loop that 1-2) obtains after the described Programmable Logic Device chip processing;
1-3) high-frequency signal that obtains of described second level phaselocked loop output secondary frequency multiplication is to the Programmable Logic Device chip;
1-4) described Programmable Logic Device chip obtains final frequency-shift signaling to be exported after treatment.
8. according to the described ultra-high-tension power transmission line power frequency parameter test of claim 7 method, it is characterized in that: described frequency-shift signaling generation module also comprises voltage comparator and optocoupler, described step 1-1) be input to first order phase-locked loop circuit chip for power frequency component through voltage comparator and optocoupler.
9. described according to Claim 8 ultra-high-tension power transmission line power frequency parameter test method, it is characterized in that: described frequency-shift signaling generation module also comprises frequency divider, described step 1-1) comprises also in that high-frequency signal output after the first order phase-locked loop circuit chip frequency multiplication by the frequency divider frequency division, obtains low frequency signal and feeds back to first order phase-locked loop circuit chip.
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| CNB2004100417834A CN1330969C (en) | 2004-08-25 | 2004-08-25 | Power frequency parameter tester and testing method for high tension transmission line |
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| CNB2004100417834A CN1330969C (en) | 2004-08-25 | 2004-08-25 | Power frequency parameter tester and testing method for high tension transmission line |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034117B (en) * | 2007-04-02 | 2010-05-19 | 武汉大学 | Power transmission line power frequency parameters measuring method and device |
| CN101666834B (en) * | 2009-09-15 | 2011-09-21 | 深圳市汇顶科技有限公司 | Industrial frequency-harmonic interference resistant signal sampling method and system |
| CN102184656B (en) * | 2011-05-10 | 2012-12-26 | 安徽省电力科学研究院 | Power frequency parameter simulation system for power transmission line and control method of power frequency parameter simulation system |
| CN102393538B (en) * | 2011-08-08 | 2013-08-07 | 西安思坦仪器股份有限公司 | Anti-interference circuit system for heating furnace of induction log tool |
| CN102707145A (en) * | 2012-05-29 | 2012-10-03 | 辽宁省电力有限公司沈阳供电公司 | Power frequency parameter calculation method of high voltage transmission line |
| CN103323660A (en) * | 2013-06-09 | 2013-09-25 | 广东明阳龙源电力电子有限公司 | H half-bridge IPM bus voltage detection circuit |
| CN103941213A (en) * | 2014-04-15 | 2014-07-23 | 国网上海市电力公司 | Site calibration method for GIS current transformer |
| CN103954869B (en) * | 2014-05-12 | 2017-01-25 | 国家电网公司 | Cable power frequency parameter testing device based on PXI system |
| CN106655003B (en) * | 2017-01-23 | 2024-02-27 | 国家电网公司 | Detection device and tracking method for power frequency transmission line and equipment |
| CN108181513B (en) * | 2018-03-15 | 2020-02-04 | 广东电网有限责任公司惠州供电局 | Inter-phase coupling capacitance testing method and system for lightning arrester based on pilot frequency method |
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| CN2107023U (en) * | 1991-12-02 | 1992-06-10 | 北京无线电技术研究所 | Power frequency parameter measuring apparatus |
| CN2529263Y (en) * | 2001-10-11 | 2003-01-01 | 上海电器科学研究所 | Digital harmonic voltage factor test instrument |
| CN2722259Y (en) * | 2004-08-25 | 2005-08-31 | 江苏省电力公司南京供电公司 | Power frequency parameter measuring device of high-voltage transmission circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4230991A (en) * | 1978-09-11 | 1980-10-28 | Alexandre Paphitis | Digital frequency process and method using frequency shifting techniques, especially for low frequency measurements |
| CN2107023U (en) * | 1991-12-02 | 1992-06-10 | 北京无线电技术研究所 | Power frequency parameter measuring apparatus |
| CN2529263Y (en) * | 2001-10-11 | 2003-01-01 | 上海电器科学研究所 | Digital harmonic voltage factor test instrument |
| CN2722259Y (en) * | 2004-08-25 | 2005-08-31 | 江苏省电力公司南京供电公司 | Power frequency parameter measuring device of high-voltage transmission circuit |
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