sensor kutumika kufuatilia kutokwa sehemu ni

Sensors used to monitor partial discharge primarily include High Frequency Current Transformers (HFCT), Masafa ya Juu Zaidi (UHF) sensorer, Utoaji wa Akustisk (AE) sensorer, RF couplers, sensorer za nyuzi za macho, capacitive coupling sensors, and magnetic field sensors. These sensors detect partial discharge phenomena based on different physical principles, including electromagnetic signals, acoustic signals, and optical signals. The selection of appropriate sensor types depends on specific application environments, detection accuracy requirements, and cost considerations.

Kutolewa kwa Sehemu Ufuatiliaji Basics

A. ni nini mfumo wa ufuatiliaji wa kutokwa kwa sehemu?

A mfumo wa ufuatiliaji wa kutokwa kwa sehemu is a professional system used for real-time detection and analysis of partial discharge phenomena within electrical equipment. The system captures electrical signals, acoustic signals, or optical signals generated by partial discharge through specific sensors and converts these signals into analyzable data, helping maintenance personnel evaluate equipment insulation status and predict potential failures.

Partial discharge monitoring systems typically include sensors, signal conditioning units, data acquisition devices, analysis software, na mifumo ya kengele. The system can continuously monitor equipment operating status and provide early fault warnings, making it an important component of modern power equipment condition monitoring.

Ni nini partial discharge measured in?

Partial discharge measurement units primarily use picocoulombs (pC, picocoulomb) to express the magnitude of discharge quantity. Picocoulomb is a unit of electric charge, where 1pC = 10^-12 coulombs. This unit can accurately represent the minute charge quantity transferred during partial discharge.

Besides charge quantity, partial discharge can also be expressed using other parameters, including discharge power (milliwatts, mW), mzunguko wa kutokwa (times per second), discharge energy (microjoules, μJ), nk. Different measurement parameters are suitable for different analysis purposes and equipment types.

How do you detect partial discharge?

Partial discharge detection methods are mainly based on various physical phenomena generated by partial discharge, including electromagnetic waves, mawimbi ya akustisk, optical signals, and chemical changes. The detection process requires using corresponding sensors to capture these signals and extract useful information through signal processing techniques.

Common detection methods include electrical detection methods (high-frequency current sensors), ultrasonic detection methods (sensorer za utoaji wa akustisk), radio frequency detection methods (RF sensors), and optical detection methods (sensorer za nyuzi za macho). Each method has its specific application scenarios and technical advantages.

Sensor Technology for Utambuzi wa kutokwa kwa sehemu

Nini sensor is used for partial discharge detection?

Partial discharge detection sensor types are diverse and can be classified into the following categories based on detection principles:

Detailed Comparative Analysis of Sensor Types

Aina ya Sensor	Detection Principle	Masafa ya Marudio	Unyeti	Matukio ya Maombi	Faida	Mapungufu
Transfoma ya Sasa ya Masafa ya Juu (HFCT)	Electromagnetic induction	0.5-100MHz	Juu	Kebo, switchgear	Direct electrical measurement, unyeti mkubwa	Affected by electromagnetic interference
Masafa ya Juu Zaidi (UHF) Kihisi	Electromagnetic wave reception	300MHz-3GHz	Juu sana	GIS, transfoma	Uwezo mkubwa wa kupinga kuingiliwa, nafasi sahihi	Gharama ya juu zaidi
Utoaji wa Akustisk (AE) Kihisi	Acoustic wave detection	20kHz-1MHz	Kati	Transfoma, vinu	Haiathiriwi na kuingiliwa kwa sumakuumeme	Affected by mechanical noise
Radio Frequency (RF) Coupler	RF signal	10-500MHz	Juu	Cable terminals, viungo	Ufungaji rahisi, gharama ya chini	Limited frequency band
Optical Fiber Sensor	Optical detection	–	Juu	High voltage environments	Good insulation, kupambana na kuingiliwa	Complex technology, gharama kubwa
Capacitive Coupling Sensor	Electric field changes	1-100MHz	Medium-high	Kebo, mabasi	Non-contact detection	Affected by environmental humidity
Magnetic Field Sensor	Magnetic field detection	0.1-50MHz	Kati	Transfoma, vinu	Good spatial resolution	Relatively low sensitivity
Chemical Sensor	Utambuzi wa gesi	–	Chini	Transformer oil	Long-term trend monitoring	Slow response speed

Transfoma ya Sasa ya Masafa ya Juu (HFCT) Technical Characteristics

High Frequency Current Transformers are the most commonly used partial discharge detection sensors, operating on the principle of electromagnetic induction. The sensors detect high-frequency current pulses generated by partial discharge to identify discharge events, featuring high sensitivity and fast response speed.

HFCT sensors are typically installed on cable sheaths or equipment housings, capturing high-frequency signals through induction coils. After amplification and filtering processing, the sensor output signals can accurately reflect the intensity and frequency characteristics of partial discharge.

Masafa ya Juu Zaidi (UHF) Sensor Technical Advantages

Ultra High Frequency sensors operate in the 300MHz-3GHz frequency band, featuring extremely high sensitivity and good anti-interference capability. UHF sensors are particularly suitable for partial discharge monitoring of GIS equipment and large transformers, enabling precise location of discharge sources.

UHF sensors can penetrate insulating materials to detect internal discharge without requiring direct contact with the tested equipment. This characteristic gives UHF sensors unique advantages in high-voltage equipment monitoring and represents the development direction of modern partial discharge monitoring technology.

Utoaji wa Akustisk (AE) Sensor Application Characteristics

Acoustic Emission sensors detect based on acoustic signals generated by partial discharge, with operating frequencies typically in the 20kHz-1MHz range. The greatest advantage of these sensors is their immunity to electromagnetic interference, making them suitable for monitoring applications in strong electromagnetic environments.

Acoustic emission sensors are particularly suitable for monitoring transformers and reactors, and can achieve discharge source location through acoustic wave propagation characteristics. The sensors offer flexible installation and can be externally mounted without affecting normal equipment operation.

Optical Fiber Sensor Technology Innovation

Sensorer za nyuzi za macho represent the cutting-edge development direction of partial discharge monitoring technology. These sensors detect optical signals or acousto-optical effects generated by partial discharge based on optical principles, featuring complete electrical insulation characteristics.

Optical fiber sensors are particularly suitable for monitoring applications in ultra-high voltage equipment and explosive environments. The sensors are immune to electromagnetic interference and can achieve long-distance signal transmission, offering unique technical advantages in harsh environments.

Capacitive Coupling Sensor Applications

Capacitive coupling sensors identify discharge events by detecting electric field changes caused by partial discharge. These sensors use non-contact detection methods, are easy to install, and are suitable for monitoring cable and busbar systems.

The operating frequency range of capacitive coupling sensors is typically 1-100MHz, with good frequency response characteristics. The sensors can achieve online installation without requiring power outages, making them an ideal choice for retrofitting existing systems.

Magnetic Field Sensor Technical Characteristics

Magnetic field sensors detect based on magnetic field changes generated by partial discharge, with an operating frequency range of 0.1-50MHz. These sensors offer good spatial resolution and can provide directional information about discharge sources.

Magnetic field sensors are particularly suitable for monitoring equipment such as transformers and reactors, and can determine the location and type of discharge through magnetic field distribution analysis. The sensors offer flexible installation and can adjust detection direction as needed.

Partial discharge monitoring system for switchgear

Switchgear Partial Discharge Mifumo ya Ufuatiliaji

Switchgear partial discharge monitoring systems need to consider the special structure and operating environment of switchgear. Switchgear typically uses metal-enclosed structures, presenting special challenges for partial discharge signal propagation and detection.

Switchgear PD monitoring systems typically use multi-sensor combination solutions, including HFCT sensors installed at cable connections, UHF sensors installed inside equipment or at observation windows, and acoustic emission sensors monitoring mechanical vibrations. This diversified monitoring approach can comprehensively cover possible discharge sources.

Special requirements for switchgear monitoring ni pamoja na: upinzani mkubwa wa kuingiliwa kwa umeme, adaptation to confined installation spaces, and ability to distinguish between operational noise and actual discharge signals. Monitoring systems need intelligent recognition capabilities to filter out interference signals generated by switching operations.

Kibadilishaji Ufuatiliaji wa Utoaji wa Sehemu

Online partial discharge monitoring system for Transformer

Transformer online partial discharge monitoring systems ni vipengele vya msingi vya ufuatiliaji wa hali ya transformer. Mfumo unaendelea kufuatilia shughuli za kutokwa kwa sehemu wakati wa operesheni ya transformer, inatathmini hali ya afya ya mifumo ya insulation, na kutabiri hatari zinazowezekana za kutofaulu.

Mifumo ya ufuatiliaji mtandaoni ya transfoma kwa kawaida hutumia michanganyiko ya vitambuzi mbalimbali, ikiwa ni pamoja na sensorer za HFCT zilizowekwa kwenye bushings za transfoma, sensorer za UHF zilizojengwa, na sensorer za utoaji wa akustisk katika mafuta. Mfumo unaweza kufikia ufuatiliaji wa kuendelea wa saa 24 na kutambua kwa wakati mwenendo wa kuzorota kwa insulation.

Utaratibu wa mtihani wa kutokwa kwa sehemu ya transfoma

Taratibu za mtihani wa kutokwa kwa sehemu ya transfoma kufuata mahitaji ya viwango vya kimataifa vya IEC 60270 na kiwango cha kitaifa cha GB/T 7354. Taratibu za mtihani ni pamoja na maandalizi ya kabla ya mtihani, ufungaji wa sensor, uthibitishaji wa calibration, utekelezaji wa mtihani, na uchambuzi wa matokeo.

Kabla ya kupima, it is necessary to ensure that the transformer is in stable operating condition and environmental conditions meet test requirements. Sensor installation must be performed according to standard specifications to ensure signal transmission accuracy.

Partial discharge test of transformer

Transformer partial discharge testing can be divided into three types: factory type tests, field commissioning tests, and operational monitoring. Different types of tests have different technical requirements and acceptance standards.

Factory type tests are conducted under strictly controlled environments with the highest test accuracy requirements. Field commissioning tests need to consider the influence factors of on-site environments. Operational monitoring focuses on long-term trend analysis and anomaly detection.

Mfumo wa ufuatiliaji wa kutokwa kwa sehemu mtandaoni

Online Partial Discharge Mifumo ya Ufuatiliaji

Online partial discharge monitoring systems have significant advantages over offline testing, enabling continuous monitoring, kengele za wakati halisi, and historical data analysis. Online systems provide more comprehensive and timely status information for equipment operation and maintenance.

Core advantages of online monitoring systems include: continuous monitoring capability, automatic data analysis, remote monitoring functions, and multi-parameter comprehensive analysis. The system can establish baseline partial discharge patterns for equipment and determine abnormal conditions through pattern recognition technology.

System integration and data analysis are key technologies for online monitoring systems. The system needs to integrate multiple sensor data and use artificial intelligence algorithms for pattern recognition and trend analysis, kutoa msingi wa kisayansi wa maamuzi ya uendeshaji na matengenezo.

Kipimo cha kutokwa kwa sehemu

Kutolewa kwa Sehemu Teknolojia ya Vipimo

Teknolojia ya kipimo cha kutokwa kwa sehemu inahusisha mlolongo kamili wa kiufundi wa kupata mawimbi, usindikaji, na uchambuzi. Mifumo ya kipimo inahitaji kuwa na sifa za kiwango cha juu cha sampuli, bendi ya masafa pana, na kelele ya chini ili kuhakikisha kunasa kwa usahihi ishara dhaifu za kutokwa.

Teknolojia ya kisasa ya kipimo hutumia njia za usindikaji wa dijiti, kunasa mawimbi ya analogi kupitia ADC ya kasi ya juu na kutoa taarifa muhimu kwa kutumia uchujaji wa kidijitali, uchambuzi wa wigo, utambuzi wa muundo, na teknolojia zingine. Usahihi wa kipimo huathiri moja kwa moja usahihi wa utambuzi wa kosa.

Usahihi wa vitambuzi na mahitaji ya unyeti imedhamiriwa kulingana na hali ya maombi. Vifaa vya high-voltage vinahitaji unyeti wa juu ili kugundua ishara dhaifu, while in strong interference environments, better anti-noise capability is needed.

Test Procedures and Standards

Partial discharge test results

Partial discharge test result analysis needs to comprehensively consider multiple parameters including discharge magnitude, mzunguko wa kutokwa, phase distribution, and spectral characteristics. Through comprehensive analysis of these parameters, the type, eneo, and severity of discharge can be determined.

Partial discharge test acceptance criteria

Partial discharge test acceptance standards are formulated according to equipment type and voltage level:

Aina ya Vifaa	Kiwango cha Voltage	Acceptance Limit (pC)	Monitoring Limit (pC)
Kibadilishaji cha Nguvu	35kV	≤10	≤50
Kibadilishaji cha Nguvu	110kV	≤20	≤100
GIS Equipment	110kV	≤5	≤20
Cable System	35kV	≤5	≤20

Sensor Selection and Application

Sensor Selection Principles

Sensor selection needs to comprehensively consider factors such as detection accuracy, kubadilika kwa mazingira, urahisi wa ufungaji, and cost-effectiveness. Different application scenarios have greatly different requirements for sensors, requiring detailed technical analysis and economic evaluation.

For new construction projects, it is recommended to use technologically advanced and highly reliable sensor products. For retrofit projects, compatibility with existing systems and installation condition limitations need to be considered.

Installation Requirements and Maintenance Guidelines

Sensor installation must be performed strictly according to technical specifications to ensure signal transmission quality and system reliability. The selection of installation locations, grounding system design, and signal cable shielding all affect monitoring effectiveness.

Regular maintenance is a necessary measure to ensure long-term stable operation of sensors. Maintenance includes sensor cleaning, connection inspection, uthibitishaji wa calibration, na upimaji wa utendaji.

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Chagua vitambuzi vinavyofaa vya ufuatiliaji wa kutokwa na uchafu ili kutoa masuluhisho ya kitaalamu na ya kuaminika ya ufuatiliaji wa hali ya vifaa vyako vya nishati!

Sensor ya joto ya fiber optic, Mfumo wa ufuatiliaji wa akili, Kusambazwa fiber optic mtengenezaji nchini China