CN105929284A - Wireless tester and testing method for live-line measuring zinc oxide arrester - Google Patents
Wireless tester and testing method for live-line measuring zinc oxide arrester Download PDFInfo
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- CN105929284A CN105929284A CN201610486043.4A CN201610486043A CN105929284A CN 105929284 A CN105929284 A CN 105929284A CN 201610486043 A CN201610486043 A CN 201610486043A CN 105929284 A CN105929284 A CN 105929284A
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- leakage current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention relates to a wireless tester and testing method for live-line measuring a zinc oxide arrester. The wireless tester comprises a transmitting unit and a receiving unit, wherein the transmitting unit acquires three-phase voltage signals of a power grid, calculates voltage amplitude and phase angle of the power grid, and transmits the voltage amplitude and phase angle information to the receiving unit through a wired or wireless means, the receiving unit acquires full leakage current and receives the voltage amplitude and phase angle information, of the power grid, sent by the transmitting unit, compares the full-leakage current phase angle with the received voltage amplitude of the power grid to obtain the phase difference, and calculates the resistive leakage current of the arrester to determine the performance of the arrester. Three-phase resistive leakage current can be simultaneously and synchronously measured in a short period of time, and the measurement precision is greatly improved.
Description
Technical field
The present invention relates to a kind of power system device field adjustable detection, particularly relate to a kind of live line measurement oxidation
The wireless test instrument of zinc arrester and detection method, be mainly used in judging the performance of arrester, and belonging to electric power should
Use field.
Background technology
Each department are newly-built in recent years, transformation circuit is more, and Zinc-Oxide Arrester is as high reliability lightning protection
Unit, the safe operation to power system plays an important role.Current test Zinc-Oxide Arrester performance
Instrument test process at the scene in wiring loaded down with trivial details, wiring needs other departments to coordinate, and interphase interference is relatively big, shadow
Ring and damage instrument and test data severe deviations, it is impossible to authentic and valid test result is provided.
Summary of the invention
The present invention is directed to above-mentioned problems of the prior art, it is provided that a kind of live line measurement Zinc-Oxide Arrester
Wireless test instrument, solve the problem that in prior art, in test process, wiring is loaded down with trivial details, interphase interference is bigger.
Further object is that the wireless test instrument that a kind of live line measurement Zinc-Oxide Arrester is provided
Detection method.
Technical scheme is as follows:
Wireless test instrument, including transmitting element and reception unit；Transmitting element completes electrical network three-phase voltage signal and adopts
Collection, calculates grid voltage amplitude and phase angle simultaneously, by wired or be wirelessly transmitted to reception unit,
Receive unit complete full leakage current collection and receive grid voltage amplitude, the phase angle that transmitting element sends
Information, and full leakage current phase angle is compared with the electric network voltage phase angle that receives obtains its phase place
Difference. and by being calculated lightning arrester resistance leakage current；The voltage circuit of described transmitting element is connected to
Bus secondary voltage terminal, signal delivered to amplifying circuit by voltage transformer, and reception is put by A/D convertor circuit
Big circuit signal is changed, and operation result signal is sent to connect by the data transmission after conversion to CPU, CPU
Receive unit；Described receives the current signal that unit uses current transformer to measure arrester lower end, and electric current is mutual
Complete for three-phase leakage current signal is delivered to amplifying circuit, A/D convertor circuit by sensor, after A/D convertor circuit conversion
Data, through CPU process, obtain final resistive leakage current.
Described current transformer straight-through current transformer.
Described A/D convertor circuit is ultra high speed A/D conversion circuit.
Described is wirelessly transferred selection micropower wireless data transmission module, uses FEC combining wireless RFCO2 laser CC1020,
This wireless communication module is transmitted by 433M public frequency.
Described transmitting element and reception unit are equipped with AC influence suppressor.
In described reception unit, CPU connects built-in industrial control machine, and built-in industrial control machine connects liquid crystal display
Device and mouse-keyboard input.
Detection method, comprises the steps: that first transmitting element sends out a synch command, receives unit and receives life
After order, both sides are acquired simultaneously, FFT process, and then the data handled well are sent to by transmitting element
Receiving unit, reception unit, by both sides data summarization, compensates according to the time delay on both sides, then to data
Finally processing, result is sent to display.
Advantages of the present invention effect is as follows:
Transmitting and receiving unit employing is wireless or wired mode communicates, and two unit all have data and process
Function.Transmitting element gathers mains voltage signal, is processed by data, obtains the phase and amplitude letter of voltage
Number, receive unit and gather the full leakage current signal of arrester, and be analyzed with the voltage signal of transmitting element,
Obtain line voltage and the phase difference of the full leakage current of arrester, finally by obtaining the resistive of full leakage current
Current component, thus judge the performance of arrester., synchronously can survey within the shorter time simultaneously
Amount three-phase resistive leakage current, and greatly improve certainty of measurement.
Support wired and wireless measurement mode and can to measuring while three-phase voltage and electric current, showing simultaneously,
Shortening the testing time, the convenient equipment removing interphase interference characteristic test meets on-the-spot needs.
Accompanying drawing explanation
Fig. 1 is two-way sine wave signal schematic diagram.
Fig. 2 is current signal polar plot.
Fig. 3 is principle of the invention structural representation.
Fig. 4 is transmitting element principle schematic of the present invention.
Fig. 5 is that the present invention receives unit principle schematic.
Fig. 6 is that on-site wireless of the present invention tests wiring schematic diagram.
Fig. 7 is that live cable of the present invention tests wiring schematic diagram.
Detailed description of the invention
Referring to the drawings, in conjunction with specific embodiments, the present invention is described in detail.
Embodiment
As it can be seen, wireless test instrument, including transmitting element and reception unit；Transmitting element completes electrical network three-phase
Voltage signal acquisition, calculates grid voltage amplitude and phase angle, by wired or wireless way for transmitting simultaneously
To receiving unit, receive unit and complete full leakage current collection and receive the line voltage that transmitting element sends
Amplitude, phase angle information, and full leakage current phase angle is compared with the electric network voltage phase angle received
Relatively obtain its phase difference. and by being calculated lightning arrester resistance leakage current；The electricity of described transmitting element
Pushing back road and be connected to bus secondary voltage terminal, signal is delivered to amplifying circuit by voltage transformer, and high-speed AD turns
Changing circuit to change the amplifying circuit signal received, the data after conversion send to CPU, and CPU is by computing
Consequential signal is sent to receive unit；Described reception unit uses straight-through current transformer to measure arrester
The current signal of lower end, complete for three-phase leakage current signal is delivered to amplifying circuit, height by straight-through current transformer
Speed A/D convertor circuit, the data after ultra high speed A/D conversion circuit conversion, through CPU process, obtain final
Resistive leakage current.
Described transmitting element and reception unit are equipped with AC influence suppressor.
In described reception unit, CPU connects built-in industrial control machine, and built-in industrial control machine connects liquid crystal display
Device and mouse-keyboard input.
1, measuring principle:
Being provided with two sine waves, frequency is identical, but initial phase is different, as shown in Figure 1:
Signal 1 corresponding current signal, signal 2 corresponding voltage signal, their mathematic(al) representation is:
V=Bsin (ω t) (2)
Current signal is launched:
Corresponding current in resistance property instantaneous value is:
Current in resistance property peak value:
Capacity current instantaneous value is:
Capacity current peak value is:
If using voltage signal V as phase reference, from polar plot, we can more clearly see resistive electricity
Stream and the size of capacity current, as in figure 2 it is shown,
As long as A,Two parameter measurements are accurate, it is possible to complete computation goes out the size of current in resistance property value.
2, the design of zinc oxide detection method
Zinc oxide detector unit general structure is shown in Fig. 3.
Mainly it is made up of transmitting element and reception cell mesh.Transmitting element mainly completes electrical network three-phase voltage
Signals collecting, calculates grid voltage amplitude and phase angle simultaneously, by wired or be wirelessly transmitted to
Receive unit, receive unit and mainly complete full leakage current collection and receive the electricity that transmitting element sends
Net voltage magnitude, phase angle information, and full leakage current phase angle with the electric network voltage phase received
Angle is compared obtains its phase difference. and by being calculated lightning arrester resistance leakage current.
The measurement of 2.1 line voltages
The voltage circuit of transmitting element is connected to bus secondary voltage terminal, and is delivered to by voltage transformer
Amplifying circuit, at a high speed holding, sample circuit are AD converted, and the data after conversion are carried out through CPU
Mathematical operation, finally sends the result to receive unit.Ultra high speed A/D conversion circuit ensures three-phase voltage letter
Number measure simultaneously.Theory diagram is as shown in Figure 4.
The measurement of 2.2 full leakage currents
Receiving unit uses punching transformer to measure the current signal of arrester lower end, and transformer has preferably
Shielding measure, otherwise, the interference of electromagnetic field extraneous during in-site measurement will make instrument normally to work.
The full leakage current signal of three-phase delivers to amplifying circuit, ultra high speed A/D conversion circuit, and the data after conversion are through CPU
Perform mathematical calculations, and realize phase calculation with three-phase voltage signal, obtain final resistive leakage current.
Theory diagram is as shown in Figure 5.
The measurement of 2.3 phase angle differences
Between voltage signal and current signal, the measurement of phase angle difference is the key affecting certainty of measurement.From public affairs
Formula (5) is it will be seen that resistive leakage current peak value is proportional toPhase angle measurement error is drawn
The current in resistance property peak change risen is:
According to field experience, properly functioning zinc oxide phase angle difference is generally 83 °, when in this angular difference scope
When internal phase angle often changes 0.1 °, current in resistance property changing value is 1.42%, if phase angle difference scope is close to 90 °
Time, the measure error thus brought can be bigger, and therefore, the survey of phase angle difference must be accurately and reliably.
Measure the a/d converter by high-speed, high precision while three-phase voltage to ensure, the survey of three-phase current
Measure similar, between voltage and current while measure by wired or be wirelessly transferred and ensure.
In power system, fundamental signal is 50Hz, and the cycle is 20ms, and corresponding phase is 360 °.When requiring phase angle
Difference is less than 0.2 °, and the measurement starting impulse error between voltage and current not can exceed that 11us, Wo Mentong
Cross employing ultra high speed A/D conversion device, high speed data transfer, scale programmable logic device etc. a series of
Hardware technology, abandons the software engineering postponing more greatly, easily to cause accumulated error, ensures three-phase voltage
Between, the accurate measurement at phase angle between three-phase current, between electric current and voltage.
P-wire mode of connection as shown in Figure 6,7, first receives and sends unit and receives the ground wire of unit, then connecing one
The testing current line of root 3 core, is most followed by 4 core voltage tester lines.The method connecing testing current line, first root
According to size of current, connect testing current line to host side " 0-2mA " or " > 2mA " (> 2mA shelves on range shelves
Standard configuration is 2-10mA), then the upper end by another termination counter.The method connecing voltage tester line, is also first to connect
PT voltage transmitter end, then connect PT second test end.
Wireless module selects micropower wireless data transmission module, uses efficient FEC forward error correction technique to combine high-performance
Less radio-frequency IC CC1020, and combine with high speed microprocessor.This wireless communication module has the strongest
Antijamming capability, all-transparent transmit, volume is little, the feature of long transmission distance low in energy consumption, the used time need not appoint
What coding techniques.Wireless module is by 433M public frequency, it is not necessary to frequency range application.
First transmitting element sends out a synch command, receives after unit receives order, both sides are acquired simultaneously,
FFT process, then the data handled well are sent to receive unit by transmitting element, receive unit by both sides
Data summarization, compensates according to the time delay on both sides, then finally processes data, and result is sent to
Display.
Under no-voltage mode, it is not required to use PT transmitter, the phase angle difference between software analog voltage and electric current.
Claims (7)
1. the wireless test instrument of live line measurement Zinc-Oxide Arrester, it is characterised in that include transmitting element and receive unit；Transmitting element completes electrical network three-phase voltage signal collection, calculate grid voltage amplitude and phase angle simultaneously, by wired or be wirelessly transmitted to reception unit, receive unit complete full leakage current collection and receive grid voltage amplitude, the phase angle information that transmitting element sends, and the electric network voltage phase angle that full leakage current phase angle is received together is compared and obtains its phase difference. and by being calculated lightning arrester resistance leakage current；The voltage circuit of described transmitting element is connected to bus secondary voltage terminal, signal is delivered to amplifying circuit by voltage transformer, the amplifying circuit signal received is changed by A/D convertor circuit, and operation result signal is sent to receive unit by the data transmission after conversion to CPU, CPU；Described receives the current signal that unit uses current transformer to measure arrester lower end, complete for three-phase leakage current signal is delivered to amplifying circuit, A/D convertor circuit by current transformer, data after A/D convertor circuit conversion, through CPU process, obtain final resistive leakage current.
The wireless test instrument of live line measurement Zinc-Oxide Arrester the most according to claim 1, it is characterised in that described current transformer straight-through current transformer.
The wireless test instrument of live line measurement Zinc-Oxide Arrester the most according to claim 1, it is characterised in that described A/D convertor circuit is ultra high speed A/D conversion circuit.
The wireless test instrument of live line measurement Zinc-Oxide Arrester the most according to claim 1, it is characterized in that micropower wireless data transmission module is selected in described being wirelessly transferred, using FEC combining wireless RFCO2 laser CC1020, this wireless communication module is transmitted by 433M public frequency.
The wireless test instrument of live line measurement Zinc-Oxide Arrester the most according to claim 1, it is characterised in that described transmitting element and reception unit are equipped with AC influence suppressor.
The wireless test instrument of live line measurement Zinc-Oxide Arrester the most according to claim 1, it is characterised in that in described reception unit, CPU connects built-in industrial control machine, and built-in industrial control machine connects liquid crystal display and mouse-keyboard input.
The detection method of the wireless test instrument of live line measurement Zinc-Oxide Arrester the most according to claim 1, it is characterized in that comprising the steps: that first transmitting element sends out a synch command, after receiving unit reception order, both sides are acquired simultaneously, FFT process, then the data handled well are sent to receive unit by transmitting element, and reception unit, by both sides data summarization, compensates according to the time delay on both sides, then finally processing data, result is sent to display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610486043.4A CN105929284A (en) | 2016-06-24 | 2016-06-24 | Wireless tester and testing method for live-line measuring zinc oxide arrester |
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| CN201610486043.4A CN105929284A (en) | 2016-06-24 | 2016-06-24 | Wireless tester and testing method for live-line measuring zinc oxide arrester |
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Cited By (5)
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|---|---|---|---|---|
| CN108333458A (en) * | 2018-05-09 | 2018-07-27 | 国家电网公司 | A kind of device measuring Zinc-Oxide Arrester electric property |
| CN111579905A (en) * | 2020-05-18 | 2020-08-25 | 云南电网有限责任公司红河供电局 | Method for testing live-line of series-compensated zinc oxide arrester |
| CN112540248A (en) * | 2020-11-06 | 2021-03-23 | 广西电网有限责任公司南宁供电局 | Voltage and current signal double-wireless transmission lightning arrester live-line test system and method |
| CN112649669A (en) * | 2020-12-21 | 2021-04-13 | 汪锐 | Lightning arrester live-line detection method based on primary phase angle measurement |
| CN113820536A (en) * | 2021-09-29 | 2021-12-21 | 国网河南省电力公司检修公司 | Zinc oxide arrester live-line detection method based on wireless synchronous current measurement technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108333458A (en) * | 2018-05-09 | 2018-07-27 | 国家电网公司 | A kind of device measuring Zinc-Oxide Arrester electric property |
| CN111579905A (en) * | 2020-05-18 | 2020-08-25 | 云南电网有限责任公司红河供电局 | Method for testing live-line of series-compensated zinc oxide arrester |
| CN112540248A (en) * | 2020-11-06 | 2021-03-23 | 广西电网有限责任公司南宁供电局 | Voltage and current signal double-wireless transmission lightning arrester live-line test system and method |
| CN112649669A (en) * | 2020-12-21 | 2021-04-13 | 汪锐 | Lightning arrester live-line detection method based on primary phase angle measurement |
| CN113820536A (en) * | 2021-09-29 | 2021-12-21 | 国网河南省电力公司检修公司 | Zinc oxide arrester live-line detection method based on wireless synchronous current measurement technology |
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Application publication date: 20160907 |