CN113820536A - Live detection method of zinc oxide arrester based on wireless synchronous current measurement technology - Google Patents
Live detection method of zinc oxide arrester based on wireless synchronous current measurement technology Download PDFInfo
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 78
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 61
- 238000001514 detection method Methods 0.000 title claims abstract description 40
- 238000005259 measurement Methods 0.000 title claims abstract description 29
- 238000005516 engineering process Methods 0.000 title claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 54
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- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 239000004020 conductor Substances 0.000 claims abstract 3
- 238000004891 communication Methods 0.000 claims description 13
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 9
- 229910052744 lithium Inorganic materials 0.000 claims description 9
- 238000012806 monitoring device Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 5
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- 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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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
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Abstract
本发明公开了一种基于无线同步电流测量技术的氧化锌避雷器带电检测方法，属于氧化锌避雷器带电检测技术领域。在三相氧化锌避雷器上分别布设电流同步采集模块，电流同步采集模块串联到计数器与避雷器泄漏电流引下线之间，进行泄漏电流采集；电压同步采集模块并联到PT二次电压，进行电压采集；氧化锌避雷器带电测试主机向电压同步采集模块和三个电流同步采集模块无线发送同步采集信号；电压同步采集模块和三个电流同步采集模块将采集的电压、电流数据汇总到氧化锌避雷器带电测试主机进行FFT计算，最终得到全电流、阻性电流和角度试验结果。本发明实现无线化、同时远程同步电流采样，能够对多种避雷器的泄露电流进行准确检测。
The invention discloses a live detection method for zinc oxide arresters based on wireless synchronous current measurement technology, and belongs to the technical field of live detection of zinc oxide arresters. A current synchronous acquisition module is respectively arranged on the three-phase zinc oxide arrester, and the current synchronous acquisition module is connected in series between the counter and the arrester leakage current down-conductor for leakage current acquisition; the voltage synchronous acquisition module is connected in parallel to the PT secondary voltage for voltage acquisition ;The zinc oxide arrester live test host wirelessly sends synchronous acquisition signals to the voltage synchronization acquisition module and the three current synchronization acquisition modules; the voltage synchronization acquisition module and the three current synchronization acquisition modules summarize the collected voltage and current data to the zinc oxide arrester live test The host performs FFT calculation, and finally obtains the test results of full current, resistive current and angle. The invention realizes wireless and remote synchronous current sampling at the same time, and can accurately detect the leakage current of various arresters.
Description
Technical Field
The invention relates to the technical field of zinc oxide arrester live-line detection, in particular to a zinc oxide arrester live-line detection method based on a wireless synchronous current measurement technology.
Background
The zinc oxide arrester has the defects of internal insulation, dampness, valve plate aging and the like in the long-term operation process, so that the leakage current of the arrester is increased, and thermal breakdown is caused in serious conditions to influence the safety production of electric power. Regular preventive trials are therefore a necessary and effective way to determine whether their working conditions are good.
In recent years, the increase of the requirement of power supply reliability has led to the transition from the original power failure pre-test to the live test of the zinc oxide arrester. The zinc oxide arrester live test can judge the aging and the damp conditions of the valve plate of the arrester through measuring the resistive component in the leakage current of the valve plate of the arrester under the condition of no power failure, and effectively reduces the power failure times. The reliability of the safe operation of the lightning arrester is realized, and the method has important significance for the safe operation of the power system.
At present, most of lightning arrester live-line testing technologies at home and abroad are wired tests, but the lightning arrester live-line testing technologies have the following defects:
1. the length of the current test line is insufficient, and three phases cannot be measured simultaneously. Under the influence of factors such as voltage grade and manufacturers, the distance between the zinc oxide arresters is different, and the length of the existing standard current test line cannot meet part of field measurement requirements. The length of electric current line is not enough to make some equipment can only single-phase measurement one by one, and this drawback not only increases the wiring number of times, increases working strength, simultaneously because can not obtain three-phase data simultaneously, leads to the experimental data analysis accuracy to reduce.
2. The current test wire increases the potential safety hazard of the test. In a test site, the phenomena of mistaken dragging, winding of an insulating ladder and the like are easily caused by a plurality of test wires, and potential safety hazards are generated; if the insulating skin of test wire is damaged, the risk that the tester directly contacts the primary equipment can be increased.
3. The current test line is too long, which increases signal interference and affects the accuracy of measured data. The current test wire is too long, and under the strong electromagnetic field interference of the transformer substation, the measured data is easily interfered, so that the measurement accuracy of the full current of the lightning arrester is reduced, and the accurate evaluation on the health of primary equipment is influenced.
4. The current test wire can not meet the effective access of the leakage current of the lightning arrester under the low-resistance state. Most of the existing zinc oxide arrester live-line testers are only suitable for arresters with high-resistance leakage current meters of grounded downlead, and leakage current cannot be effectively accessed to the arresters in low-resistance states.
The patent document with publication number CN 105137269 a discloses a distributed wireless synchronous zinc oxide arrester live-line detection device, which comprises a wireless base station, a leakage current acquisition unit, a reference voltage acquisition unit and an operation terminal, wherein the operation terminal is in communication connection with the leakage current acquisition unit and the reference voltage acquisition unit through a wireless local area network respectively, the wireless base station is externally connected with a GPS/BD satellite through a mobile wireless network, and the wireless base station and the GPS/BD satellite are respectively connected with the leakage current acquisition unit and the reference voltage acquisition unit through the mobile wireless network. The invention can detect the working conditions of the zinc oxide lightning arrester of a plurality of lines and even a whole substation at one time, and has the advantages of small volume and less cable accessories. However, the invention cannot realize accurate detection of leakage current of the high-resistance leakage ammeter of the grounding down lead, the low-resistance leakage ammeter or the lightning arrester of the on-line monitoring device.
Patent document with publication number CN 102830319 a discloses a device and a method for detecting insulation state electrification of a zinc oxide arrester, wherein a host case adopts a CPCI type structure, a measurement connection cable, a signal conditioning circuit, a data acquisition and processing circuit and an industrial control computer are arranged in the host case, and all parts of circuits are connected through a bottom end connection circuit board; and a touch display screen is arranged on the host case. The method can accurately and stably measure the resistive current of the lightning arrester without leading out a secondary signal of a voltage transformer, thereby effectively obtaining the state of the lightning arrester under the operating voltage and ensuring the safe and stable operation of equipment. However, the present invention also fails to solve the above-mentioned technical problems.
Disclosure of Invention
In view of the above, the present invention provides a zinc oxide arrester live-line detection method based on a wireless synchronous current measurement technology, which is suitable for accurate detection of an arrester under various conditions such as a high-resistance leakage ammeter of a grounded down-lead strip, a low-resistance leakage ammeter, an online monitoring device, and the like, and realizes wireless and remote synchronous current sampling.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the zinc oxide arrester live-line detection method based on the wireless synchronous current measurement technology comprises the following steps:
s1: respectively arranging current synchronous acquisition modules on an A, B, C three-phase zinc oxide arrester, wherein the current synchronous acquisition modules are connected in series between a counter and a leakage current down lead of the arrester to acquire leakage current;
s2: the voltage synchronous acquisition module is connected to the PT secondary voltage in parallel to acquire the voltage;
s3: the zinc oxide arrester live test host wirelessly sends synchronous acquisition signals to the voltage synchronous acquisition module and the three current synchronous acquisition modules;
s4: the voltage synchronous acquisition module and the three current synchronous acquisition modules gather acquired voltage and current data to the zinc oxide arrester live-line test host for FFT calculation, and finally, full current, resistive current and angle test results are obtained.
Further, the synchronous collection module of electric current includes jaw type current sensor, AD chip, ARM treater, synchronization module, wireless module, power module, lithium cell, electric quantity collection module and LCD display screen, jaw type current sensor with the AD chip is connected, wireless module, synchronization module with the AD chip connects gradually, AD chip, synchronization module, wireless module, power module, LCD display screen all with the ARM treater is connected, power module with the lithium cell is connected, the lithium cell passes through electric quantity collection module with the ARM treater is connected.
Further, the input range AC 0.1~20mA of jaw type current sensor for gather the leakage current that ammeter was revealed to the ground connection downlead high resistance type, ammeter or on-line monitoring device's arrester was revealed to the low resistance type, the current signal that the jaw type current sensor acquireed passes through wireless module transmits to zinc oxide arrester live test host computer, calculates, finally obtains full current, resistive current and angle test result.
Furthermore, the pincerlike current sensor is formed by combining a current transformer and an ammeter, a lead through which a current to be measured passes is clamped into a primary coil of the current transformer, and the current is induced in the secondary coil and displayed in the ammeter under the electromagnetic induction action of the current transformer.
Further, the AD chip is a synchronous sampling ADC with multi-input and speed of 700Ksps and 16 bits.
Further, the power module comprises a plurality of independently programmable reference voltage sources for system-level gain calibration and is provided with a flexible serial interface operating in a wide power supply range to realize communication with various controllers.
Furthermore, the wireless module comprises a wireless synchronization module and a wireless communication module, and both the wireless synchronization module and the wireless communication module have 64-bit FEC forward error correction capability, so that the phenomenon of mutual interference between the modules is avoided.
Furthermore, the voltage synchronous acquisition module is connected to the PT terminal box in parallel, and transmits reference voltage information to the zinc oxide arrester live-line test host through the wireless transmission module.
When a person skilled in the art carries out charged detection on a zinc oxide arrester, in order to improve detection convenience and accuracy, it is generally thought that a detection device is improved, and electrical elements needing to be connected, such as an external alternating current power supply, are reduced; in addition, under the condition that the acquisition device is in wired connection with the detection instrument, the problems of coupling and interference during wired detection are solved by designing the signal wire storage device. For example, patent document CN 103777064 a discloses a zinc oxide arrester live-line detection device without an external ac power supply. Comprises a current acquisition unit, an amplification unit, a singlechip, a keyboard, a display and a printer; the current acquisition unit is provided with an A phase, a B phase and a C phase, the A phase and the B phase of the current acquisition unit are respectively connected with the amplification unit, the output end of the amplification unit is connected with an A/D conversion channel of the singlechip, and the singlechip is sequentially connected with the keyboard, the display and the printer through a bus. The three-phase lightning arrester live test device can simultaneously complete the on-site detection of the three-phase lightning arrester in one-time measurement, and has the remarkable characteristics of simple and convenient test operation, small influence by on-site interference, good data repeatability, high measurement precision, wide application occasions, convenience in use and low maintenance cost, and can be suitable for the live test of the lightning arrester under different on-site conditions inside and outside a transformer substation and accurately judge the running condition of the lightning arrester. Also for example, a portable zinc oxide arrester live-line detection device and system disclosed in patent publication No. CN 108535569 a includes: the detection device comprises a machine body, a winding wheel and a detection probe, wherein the winding wheel is a metal winding wheel, the detection probe is connected with the metal winding wheel through a lead, the lead is wound on the metal winding wheel, and the metal winding wheel is electrically connected with the machine body; the machine body is provided with a live detection module which is electrically connected with the metal winding wheel; the wire comprises a first wire and a second wire, the live detection module comprises a first amplifier, a second amplifier, a third amplifier, a fourth amplifier, a fifth amplifier, a first resistor, a second resistor and a third resistor, the output end of the first amplifier is respectively connected with the input end of the second amplifier and the input end of the fifth amplifier, the second amplifier is connected with the fourth amplifier in series after being connected with the third amplifier in parallel, and the first resistor, the second resistor and the third resistor are respectively connected with the first amplifier, the fourth amplifier and the fifth amplifier in parallel. The two patent documents respectively realize the problems of convenience and accuracy in the process of detecting the zinc oxide arrester in a charged mode under the condition of adopting wired connection, and technicians in the field know that the wired connection is strong in anti-interference performance and high in transmission efficiency relative to wireless connection, so that the zinc oxide arrester charged detection method adopting the wireless synchronous current measurement technology realizes the convenience of detection and also meets the requirement of high detection precision, and the technical scheme of the method is not easy to think for the technicians in the field.
Compared with the prior art, the invention has the following beneficial effects:
the zinc oxide arrester live-line detection method based on the wireless synchronous current measurement technology adopts modular current collection, can perform high-precision current sampling, and can accurately obtain the continuous current of the arrester in operation. The method is suitable for lightning arresters under various conditions such as a grounding down lead with a high-resistance leakage ammeter, a low-resistance leakage ammeter or an online monitoring device, and solves the problem that most of existing instruments are suitable for lightning arresters with grounding down lead with a high-resistance leakage ammeter. Can wireless transmission current information, reduce the wiring to effectively reduce testing personnel working strength, strengthen experimental security. By comparing the data measured by using the system with the data measured by the online monitoring device, the accuracy of the data of the online monitoring device is ensured.
1. Current measurement is wireless, can satisfy the electrified demand of measuring that long distance arrester interval acquireed three-phase data simultaneously, and wireless communication distance can reach 3 hectometers, can satisfy any voltage class transformer substation.
2. Effectively reduce instrument weight, reduce test wiring complexity, alleviate testing personnel working strength, reduce test time, improve work efficiency.
3. Nanosecond wireless synchronization can carry out high accuracy current sampling, can accurately acquire arrester in-service continuous current, improves full current measurement accuracy, and then accurate evaluation arrester's health condition.
4. By adopting the pincerlike current sensor method, high-precision current sampling can be performed, the continuous current of the lightning arrester in operation can be accurately acquired, and the method is suitable for different working conditions.
Drawings
Fig. 1 is a schematic structural diagram of an electrification measuring device of a zinc oxide arrester according to a first embodiment of the invention;
fig. 2 is a schematic structural connection diagram of a current synchronous acquisition module in the second embodiment of the present invention.
Detailed Description
In order to better understand the present invention, the following examples are further provided to clearly illustrate the contents of the present invention, but the contents of the present invention are not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.
Example one
The zinc oxide arrester live-line detection method based on the wireless synchronous current measurement technology comprises the following steps:
s1: respectively arranging current synchronous acquisition modules 2 on an A, B, C three-phase zinc oxide arrester 1, wherein the current synchronous acquisition modules 2 are connected in series between a counter 3 and a leakage current down lead of the arrester to acquire leakage current;
s2: the voltage synchronous acquisition module 4 is connected in parallel to the PT secondary voltage for voltage acquisition;
s3: the zinc oxide arrester live test host 5 wirelessly sends synchronous acquisition signals to the voltage synchronous acquisition module and the three current synchronous acquisition modules;
s4: the voltage synchronous acquisition module 4 and the three current synchronous acquisition modules 2 gather the acquired voltage and current data to the zinc oxide arrester live-line test host 5 for FFT calculation, and finally, full current, resistive current and angle test results are obtained.
As shown in fig. 1, the zinc oxide arrester live detection device comprises three current synchronous acquisition modules 2, a voltage synchronous acquisition module 4 and a zinc oxide arrester live test host 5, wherein the three current synchronous acquisition modules 2 are respectively connected in series between an a/B/C three-phase counter 3 and an arrester leakage current down line, the voltage synchronous acquisition module 4 is connected in parallel to a PT terminal box 6, and the three current synchronous acquisition modules 2 and the voltage synchronous acquisition module 4 are connected with the zinc oxide arrester live test host 5 through wireless signals.
The working mode of the device is as follows: the zinc oxide arrester live test host sends a synchronous signal to 3 current synchronous acquisition modules, the current synchronous acquisition modules are started to perform A/D synchronous sampling, and each alternating current signal cycle acquires 256 points to achieve a 12.8k sampling rate. And summarizing the acquired voltage and current data to a host computer every second for FFT calculation, and finally obtaining test results of full current, resistive current, angle and the like.
Example two
As shown in fig. 2, the method for detecting the electrification of the zinc oxide arrester based on the wireless synchronous current measurement technology in the embodiment of the present invention is different from the first embodiment in that:
the synchronous collection module of electric current includes jaw type current sensor, AD chip, ARM treater, synchronous module, wireless module, power module, lithium cell, electric quantity collection module and LCD display screen, jaw type current sensor with the AD chip is connected, wireless module, synchronous module with the AD chip connects gradually, AD chip, synchronous module, wireless module, power module, LCD display screen all with the ARM treater is connected, power module with the lithium cell is connected, the lithium cell passes through electric quantity collection module with the ARM treater is connected.
The input range AC 0.1~20mA of pincerlike current sensor for gather the leakage current that ammeter or on-line monitoring device's arrester was revealed to ground connection downlead high resistance type, low resistance type, the current signal that pincerlike current sensor acquireed passes through wireless module transmits to zinc oxide arrester live test host computer, calculates, finally obtains full current, resistive current and angle test result.
By adopting a pincerlike current sensor method, high-precision current sampling is carried out, the continuous current of the lightning arrester in operation is accurately acquired, and the problem that the lightning arrester with a grounding down lead and a low-resistance leakage ammeter is difficult to acquire current information can be effectively solved.
The split core type current sensor is formed by combining a current transformer and an ammeter, a lead through which a current to be measured passes is clamped into a primary coil of the current transformer, and the current is induced in the secondary coil and displayed in the ammeter under the action of electromagnetic induction of the current transformer.
In addition, the current signals acquired by the pincerlike current sensor can be wirelessly transmitted to a testing device host for calculation, and finally, test results such as full current, resistive current, angle and the like are obtained.
EXAMPLE III
The embodiment of the invention discloses a zinc oxide arrester live-line detection method based on a wireless synchronous current measurement technology, which is different from the second embodiment in that:
the AD chip adopts Ti to produce ADS8353, multi-channel input, speed 700Ksps, 16 bit, synchronous sampling ADC.
The power supply module comprises a plurality of independently programmable reference voltage sources, and can be used for gain calibration at a system level. And a flexible serial interface is provided which can operate over a wide range of power supplies, thereby easily enabling communication with a variety of host controllers.
The wireless module comprises a wireless synchronization module and a wireless communication module, and the two modules are not influenced by baud rate and communication distance, so that the communication speed of the measuring extension and the instrument host reaches the radio wave transmission speed (light speed). The working frequency range of the wireless communication module does not influence the wireless synchronization module, and the two wireless modules have 64-bit FEC forward error correction capability and do not generate the phenomenon of mutual interference between the modules.
The specific operation steps are as follows:
3, wirelessly connecting a zinc oxide arrester live test instrument, and sending a synchronous signal to a voltage and current synchronous acquisition module by using a zinc oxide arrester live test host to realize data synchronization;
and 4, connecting the voltage synchronous acquisition module to the PT secondary voltage in parallel to acquire the voltage. And checking test data in the zinc oxide arrester live test host, and if the test data is consistent with the conventional measurement data, indicating that the zinc oxide arrester live detection method of the wireless synchronous current measurement technology is error-free.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
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Cited By (1)
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