Five star Hotel electrical equipment infrared testing +ultrasonic testing high voltage distribution panels china
Infrared Thermography Imaging Surveys service Hotel electrical equipment inspection maintance testing electrical scanning at china NKAUTOMATIC
five-star-hotel Infrared Thermography Imaging Surveys service inspection maintance testing lectrical scanning at china NKAUTOMATIC
Since its establishment, the company has been relying on the Guangdong Southern Electric Power Research Institute as a high-tech enterprise engaged in the preventive detection service of electrical equipment failures. The company has provided electrical equipment prevention for large-scale hotels such as super high-rise hotels, large island hotels, theme hotels, etc. Infrared testing, ultrasonic testing and maintenance services
Taking "leading technology, serving customers" as the business purpose of the enterprise, and "professional progress, perseverance, teamwork" as the enterprise spirit. The company will always use the market as the hotel's electrical equipment preventive testing (infrared testing + ultrasonic testing) program
The purpose of hotel electrical equipment testing
Long-term operation of power equipment will inevitably cause problems such as insulation aging and material degradation, thereby reducing the life expectancy of the equipment, causing failures and accidents. The irreparable loss caused by sudden failures to the hotel and the impact of the hotel image are much greater than the cost of inspection . Regular preventive infrared and ultrasonic testing is to discover the potential defects or hidden dangers of the equipment in time, and regularly inspect the equipment at regular intervals. Preventive infrared and ultrasonic testing of related power equipment can improve the reliability of equipment operation, ensure the quality of equipment operation, arrange power outage maintenance in an orderly manner, reduce sudden failures, and reduce equipment failure rates.
Electrical prevention testing can also be applied to the acceptance inspection of electrical equipment completion in new construction projects. For electrical equipment that has just been put into operation and is still under warranty, preventive testing can detect potential defects or hidden dangers during the installation process as early as possible, and can allow the construction unit to make rectification in time to lay a solid foundation for the long-term stable operation of the equipment.
2. Testing basis
The detection basis is: "Infrared Detection Technical Standard" (DL/T664-2008), and the detection equipment has passed the measurement certification
3. Overview of inspection engineering:
Infrared thermal imaging inspection of all 10kV transformers and all low-voltage power distribution cabinets, high-power wells, equipment floors, elevators, air conditioners, lighting, kitchen equipment and other control boxes, busbars, and cables connected to the hotel's 10kV transformers, and Ultrasonic testing of the hotel's 10kV high-voltage distribution cabinet, without power-off of the above equipment, live non-contact testing.
The entrusting hotel sends at least one person, (responsible for leading the testing engineer in and out to find the testing equipment, and disassembling the door of the electric cabinet, etc., and maintaining the safety of the site)
3.1 Our company issued a fault/normal operation infrared detection report including infrared thermal imaging map and visible light correspondence map.Anomaly chart notes feasible solution suggestions, issued a list of all infrared detection electrical cabinets and corresponding maximum temperatures
3.2 The failure/normal operation ultrasonic testing report issued by our company includes the ultrasonic spectrum and the corresponding map of the visible light. More than 10 abnormal charts are noted. Possible solutions are recommended. A list of all electrical cabinet transformers for ultrasonic testing is issued and whether it is normal or not
4. Ultrasonic testing content of high-voltage equipment and transformers
Perform ultrasonic testing on the 10kV high-voltage distribution cabinet of the XXXXXXXXXXXXXX hotel.
4.1 Ultrasonic full-function fault detector detection principle method
Ultrasonic full-function fault detector can sense high-frequency signals (ultrasonic waves) generated by running equipment faults, pressure/vacuum leakage and electrical discharge. It uses a unique heterodyne method (Heterodyning) to convert these signals into an audible audio range, allowing users to hear these sounds through headphones, and see the intensity indication on the pointer.
Arc light or partial discharge (corona) will generate an ultrasonic signal from the insulated position. This discharge signal can be quickly located after being scanned by the ultrasonic detector
The point of failure. This type of signal sounds like frying or buzzing with headphones. The closer the detector is to the discharge, the stronger the signal will be. This type of detection is suitable for the preventive maintenance and repair of power switches, transformers, relays, circuit breakers, busbars, and insulation devices.
Perform inspection
Record any information about the condition and abnormal state of the equipment. After the inspection is completed, briefly communicate with specific personnel in the area, evaluate the inspection results, notify the specific personnel to confirm when an alarm or emergency occurs, and then issue a report.
Evaluation level description:
Critical defects (Class I): The severity has made the equipment inoperable safely, which may cause accidents or endanger personal safety at any time.
Major defects (Class II): The defects are relatively significant, but the equipment can still continue to operate safely in the short term.
It should be eliminated in a short time, and surveillance should be strengthened before elimination.
General defects (Category III): It has little impact on the recent safe operation and can be included in the annual and quarterly maintenance plans to eliminate it.
Normal operation (Category IV): The equipment is in normal operation.
Issued abnormal/normal operation ultrasonic inspection report including ultrasonic chart and visible light map abnormal chart
Note feasible solution suggestions
Issue a list of all electrical cabinets and transformers tested by ultrasound and indicate whether they are normal
4.2 Advantages of using ultrasonic testing technology:
1. Prior to infrared and vibration technology, early fault conditions were detected.
2. Widely used, including any kind of high-speed and low-speed bearings.
3. Ultrasound is a high-frequency short-wave signal that can filter out most of the environmental noise.
4. The detection method is simple and practical.
5. Data can be recorded and trend analysis can be performed.
6. The instrument is equipped with a dedicated interface, which can be used in combination with vibration analysis technology.
7. In places where infrared thermal imaging testing cannot be completed, ultrasonic testing is competent.
4.3 Application of ultrasonic testing and analysis in preventive testing of electrical equipment
Among the various faults of electrical equipment, electrical burn faults are more harmful because they are difficult to find beforehand, and have increasingly attracted the attention of the power supply operation and maintenance department. Most electrical equipment works under the dual action of force and electricity, so mechanical failure and electrical burn failure constitute the main body of electrical failure. In the case of electrical equipment running for many years and increasing load, the phenomenon of electrical burns of equipment has become more and more prominent, and the problem of electrical burns is not easy to find beforehand, and it is very harmful. Therefore, the prevention and prevention of electrical burn failures in equipment has become an important task for power supply operating units to ensure power supply safety.
At present, the detection of electrical equipment is mainly based on infrared thermal imaging detection. This detection method is intuitive and convenient, and the detection is obvious.
Infrared thermal imaging detection is mainly to detect the surface temperature of the equipment within the visible range and failure analysis. In some occasions, ultrasonic detection is more competent for the detection task.
① When using infrared thermal imaging technology to detect the internal contact parts of the switch cabinet of the substation, the door of the switch cabinet must be opened to detect, otherwise the detection work cannot be completed. For some high-voltage switchgears, it is forbidden to open during operation. At this time, it is necessary to detect the internal discharge of the switchgear with an ultrasonic detector to analyze whether there is a fault inside the switchgear.
② The electrical and chemical corrosion of the electrical connection part due to poor connection or loose operation for a long time, etc., resulting in insufficient cross-section (or equivalent cross-sectional area) of the main conductive circuit, increased electrical connection impedance, resulting in poor diversion and burns to the contact network At the beginning of the loosening of the equipment and the connection parts, there is no overheating temperature at this time, and the ultrasonic detector can detect the ultrasonic waves caused by the loose discharge of the electrical equipment
Perform inspection
Record any information about the condition and abnormal state of the equipment. After the inspection is completed, briefly communicate with specific personnel in the area, evaluate the inspection results, notify the specific personnel to confirm when an alarm or emergency occurs, and then issue a report.
Safety requirements for infrared preventive diagnosis
Although infrared preventive diagnosis is a non-contact inspection, due to the inevitable proximity to live running equipment, trained personnel are required to perform this inspection.
The implementation of DL/T664-2016 infrared detection technology standards, the national electrical safety code as the guiding principle, in line with the current relevant national standards and regulations. To ensure personal safety, reliable power distribution, advanced technology, economical and reasonable, use advanced infrared thermal imager for long-distance, non-contact, accurate, real-time, and rapid performance testing of actual equipment usage, determine equipment operating conditions, and analyze failures.
ELECTRIC
