CN206038784U - Live line measurement zinc oxide arrester's wireless tester - Google Patents
Live line measurement zinc oxide arrester's wireless tester Download PDFInfo
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- CN206038784U CN206038784U CN201620641238.7U CN201620641238U CN206038784U CN 206038784 U CN206038784 U CN 206038784U CN 201620641238 U CN201620641238 U CN 201620641238U CN 206038784 U CN206038784 U CN 206038784U
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- wireless
- receiving unit
- live line
- line measurement
- oxide arrester
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Abstract
The utility model relates to a live line measurement zinc oxide arrester's wireless tester and detection method, including transmitting element and receiving element, the transmitting element is accomplished electric wire netting three -phase voltage signal and is gathered, calculate grid voltage amplitude and phase angle simultaneously, transmit receiving element to through wired or wireless mode, receiving element accomplishes the grid voltage amplitude that full leakage current gathered and the reception and transmition unit sends, phase angle information, and relatively obtain its phase difference to full leakage current phase angle with the received grid voltage phase angle. And obtain hindering nature of arrester leakage current through calculation, thereby judge the performance of arrester, can be in the short time, and simultaneously, synchronously measure three phase resistance nature leakage current, and greatly improved measurement accuracy.
Description
Technical field
This utility model is related to a kind of power system device field adjustable detection, more particularly to a kind of live line measurement Zinc Oxide
The wireless test instrument of spark gap, is mainly used in judging the performance of spark gap, belongs to electric power application.
Background technology
In recent years each department it is newly-built, transformation circuit it is more, Zinc-Oxide Arrester is as high reliability lightning protection unit, right
The safe operation of power system plays an important role.The instrument of current test Zinc-Oxide Arrester performance was tested at the scene
In journey, wiring is loaded down with trivial details, and wiring needs other departments to coordinate, and interphase interference is larger, affects and damages instrument and test data is seriously inclined
Difference, it is impossible to which authentic and valid test result is provided.
Utility model content
This utility model is directed to above-mentioned problems of the prior art, there is provided a kind of live line measurement Zinc-Oxide Arrester
Wireless test instrument, solve the problems, such as in prior art in test process that wiring is loaded down with trivial details, interphase interference is larger.
The technical solution of the utility model is as follows：
Wireless test instrument, including transmitting element and receiving unit；Transmitting element is by wired or wireless mode and reception
Unit communication；The voltage circuit of described transmitting element is connected to bus secondary voltage terminal, and signal is sent to by voltage transformer
Amplifying circuit, A/D convertor circuit are changed to the amplifying circuit signal for receiving, and the data is activation after conversion to CPU, CPU will be transported
Calculate consequential signal and be sent to receiving unit；Described receiving unit measures the electric current letter of spark gap lower end using current transformer
Number, three-phase full leakage current signal is sent to amplifying circuit, A/D convertor circuit, the number after A/D convertor circuit conversion by current transformer
According to through CPU process.
Described current transformer straight-through current transformer.
Described A/D convertor circuit is ultra high speed A/D conversion circuit.
When described transmitting element is wirelessly communicated with receiving unit, described wireless mode from micropower without
Line number transmission module, using FEC combining wireless RFCO2 laser CC1020, the wireless communication module is transmitted by 433M public frequencys.
Described transmitting element and receiving unit are equipped with AC influence suppressor.
In described receiving unit, CPU is connected with built-in industrial control machine, built-in industrial control machine connection liquid crystal display and Mus
Mark input through keyboard end.
The utility model has the advantages of as follows：
Transmitting and receiving unit is communicated using wireless or wired mode, and two units all have data processing work(
Energy.Transmitting element gathers mains voltage signal, by data processing, obtains the phase and amplitude signal of voltage, and receiving unit is adopted
The full leakage current signal of collection spark gap, and be analyzed with the voltage signal of transmitting element, obtain line voltage and spark gap is complete
The phase contrast of leakage current, finally by the resistive current component for obtaining full leakage current, so that judge the performance of spark gap.Can
With within the shorter time, while, synchronously measure three-phase resistive leakage current, and greatly improve certainty of measurement.
Support wired and wireless measurement mode and can shorten to measuring while three-phase voltage and electric current, while showing
Testing time, the convenient equipment for removing interphase interference characteristic test is meeting live needs.
Description of the drawings
Fig. 1 is two-way sine wave signal schematic diagram.
Fig. 2 is current signal vectogram.
Fig. 3 is this utility model theory structure schematic diagram.
Fig. 4 is this utility model transmitting element principle schematic.
Fig. 5 is this utility model receiving unit principle schematic.
Fig. 6 is that this utility model on-site wireless tests wiring schematic diagram.
Fig. 7 is that this utility model live cable tests wiring schematic diagram.
Specific embodiment
Referring to the drawings, in conjunction with specific embodiments, describe this utility model in detail.
Embodiment
As illustrated, wireless test instrument, including transmitting element and receiving unit；Transmitting element completes electrical network three-phase voltage letter
Number collection, while calculate grid voltage amplitude and phase angle, by wired or be wirelessly transmitted to receiving unit, receives single
Unit completes full leakage current collection and receives grid voltage amplitude, the phase angle information that transmitting element sends, and full leakage
Current phase angle is compared with the electric network voltage phase angle for receiving and obtains its phase contrast. and by being calculated lightning arrester block
Property leakage current；The voltage circuit of described transmitting element is connected to bus secondary voltage terminal, and signal is sent by voltage transformer
To amplifying circuit, ultra high speed A/D conversion circuit is changed to the amplifying circuit signal for receiving, the data is activation after conversion to CPU,
Operation result signal is sent to receiving unit by CPU；Described receiving unit measures spark gap using straight-through current transformer
Three-phase full leakage current signal is sent to amplifying circuit, ultra high speed A/D conversion electricity by the current signal of lower end, straight-through current transformer
Road, the data after ultra high speed A/D conversion circuit conversion obtain final resistive leakage current through CPU process.
Described transmitting element and receiving unit are equipped with AC influence suppressor.
In described receiving unit, CPU is connected with built-in industrial control machine, built-in industrial control machine connection liquid crystal display and Mus
Mark input through keyboard end.
1st, measuring principle：
Two sine waves are provided with, frequency is identical, but initial phase is different, as shown in Figure 1：
1 corresponding current signal of signal, 2 corresponding voltage signal of 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 vectogram we can more clearly see current in resistance property and
The size of capacity current, as shown in Fig. 2
As long as A,Two parameter measurements are accurate, it is possible to which complete computation goes out the size of current in resistance property value.
2nd, the design of Zinc Oxide detection method
Zinc Oxide detector unit population structure is shown in Fig. 3.
Mainly it is made up of transmitting element and receiving unit part.Transmitting element mainly completes electrical network three-phase voltage signal and adopts
Collection, while calculate grid voltage amplitude and phase angle, by wired or be wirelessly transmitted to receiving unit, receiving unit master
Complete full leakage current collection and receive grid voltage amplitude, the phase angle information that transmitting element sends, and full leakage
Current phase angle is compared with the electric network voltage phase angle for receiving and obtains its phase contrast. and by being calculated lightning arrester block
Property leakage current.
The measurement of 2.1 line voltages
The voltage circuit of transmitting element is connected to bus secondary voltage terminal, and is sent to amplification electricity by voltage transformer
Road, at a high speed holding, sample circuit are AD converted, and the data after conversion perform mathematical calculations through CPU, finally send result
To receiving unit.Ultra high speed A/D conversion circuit ensures that three-phase voltage signal is measured simultaneously.Theory diagram is as shown in Figure 4.
The measurement of 2.2 full leakage currents
Current signal of the receiving unit using punching transformer measurement spark gap lower end, transformer have preferably shielding to arrange
Apply, otherwise, extraneous interference of electromagnetic field during in-site measurement will make the instrument cannot normal work.The full leakage current signal of three-phase is sent to
Amplifying circuit, ultra high speed A/D conversion circuit, the data after conversion perform mathematical calculations through CPU, and realize with three-phase voltage signal
Phase calculation, obtains 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 for affecting certainty of measurement.From formula (5) I
As can be seen that resistive leakage current peak value be proportional toThe current in resistance property peak change that phase angle measurement error causes is：
According to field experience, generally 83 ° of the Zinc Oxide phase angle difference of normal operation, when in this angular difference scope internal phase angle
When often changing 0.1 °, current in resistance property changing value is 1.42%, if phase angle difference scope is close to 90 °, the measurement for thus bringing
Error can be bigger, therefore, the survey of phase angle difference must be accurately and reliably.
While three-phase voltage, measurement ensures that by the a/d converter of high-speed, high precision the measurement of three-phase current is also very
Similar, while between voltage and current, measurement is by wired or be wirelessly transferred ensureing.In power system, fundamental signal is
50Hz, cycle are 20ms, and corresponding phase is 360 °.When requiring phase angle difference less than 0.2 °, the measurement between voltage and current
, no more than 11us, we are by adopting ultra high speed A/D conversion device, high speed data transfer, may be programmed on a large scale for starting impulse error
A series of hardware technologies such as logical device, abandon delay software engineering that is larger, easily causing accumulated error, ensure three-phase electricity
The accurate measurement at phase angle between pressure, between three-phase current, between electric current and voltage.
P-wire mode of connection receives and sends the ground wire of unit and receiving unit as shown in Figure 6,7, first, then connects 3 cores
Testing current line, is most followed by 4 core voltage tester lines.The method for connecing testing current line, first according to size of current, connects testing current
Line to host side " 0-2mA " or ">On 2mA " range shelves (>2mA shelves standard configuration is 2-10mA), then the upper of enumerator is terminated by another
End.The method for connecing voltage tester line, and PT voltages transmission generator terminal is first connect, then connect PT second tests end.
Wireless module selects micropower wireless data transmission module, combines high performance nothing using efficient FEC forward error correction techniques
Line RFCO2 laser CC1020, and combine with high speed microprocessor.The wireless communication module has very strong capacity of resisting disturbance,
The characteristics of all-transparent transmission, small volume, long transmission distance low in energy consumption, the used time does not need any coding techniques.Wireless module is logical
433M public frequencys are crossed, without the need for frequency range application.
Transmitting element sends out a synch command first, and after receiving unit receives order, both sides are acquired simultaneously, at FFT
Reason, then transmitting element by the data is activation handled well to receiving unit, receiving unit by both sides data summarization, according to both sides
Time delay is compensated, and then carries out final process to data, is as a result sent to display.
Under no-voltage mode, PT transmitters, the phase angle difference between software analog voltage and electric current is not required the use of.
Claims (6)
1. the wireless test instrument of live line measurement Zinc-Oxide Arrester, it is characterised in that including transmitting element and receiving unit；Send
Unit is communicated with receiving unit by wired or wireless mode；It is secondary that the voltage circuit of described transmitting element is connected to bus
Signal is sent to amplifying circuit by voltage terminal, voltage transformer, and A/D convertor circuit is changed to the amplifying circuit signal for receiving,
Operation result signal is sent to receiving unit to CPU, CPU by the data is activation after conversion；Described receiving unit adopts electric current
Three-phase full leakage current signal is sent to amplifying circuit, AD by the current signal of transformer measurement spark gap lower end, current transformer
Change-over circuit, the data after A/D convertor circuit conversion are through CPU process.
2. the wireless test instrument of live line measurement Zinc-Oxide Arrester according to claim 1, it is characterised in that described electricity
Current transformer straight-through current transformer.
3. the wireless test instrument of live line measurement Zinc-Oxide Arrester according to claim 1, it is characterised in that described AD
Change-over circuit is ultra high speed A/D conversion circuit.
4. the wireless test instrument of live line measurement Zinc-Oxide Arrester according to claim 1, it is characterised in that described sends out
When sending unit wirelessly to communicate with receiving unit, described wireless mode selects micropower wireless data transmission module, adopts
FEC combining wireless RFCO2 laser CC1020, the wireless communication module are transmitted by 433M public frequencys.
5. the wireless test instrument of live line measurement Zinc-Oxide Arrester according to claim 1, it is characterised in that described sends out
Unit and receiving unit is sent to be equipped with AC influence suppressor.
6. the wireless test instrument of live line measurement Zinc-Oxide Arrester according to claim 1, it is characterised in that described connects
Receive in unit, CPU is connected with built-in industrial control machine, built-in industrial control machine connection liquid crystal display and mouse-keyboard input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620641238.7U CN206038784U (en) | 2016-06-24 | 2016-06-24 | Live line measurement zinc oxide arrester's wireless tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620641238.7U CN206038784U (en) | 2016-06-24 | 2016-06-24 | Live line measurement zinc oxide arrester's wireless tester |
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| CN206038784U true CN206038784U (en) | 2017-03-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534007A (en) * | 2021-07-28 | 2021-10-22 | 广东电网有限责任公司 | Lightning arrester leakage current monitoring method and system |
-
2016
- 2016-06-24 CN CN201620641238.7U patent/CN206038784U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534007A (en) * | 2021-07-28 | 2021-10-22 | 广东电网有限责任公司 | Lightning arrester leakage current monitoring method and system |
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| GR01 | Patent grant |