Dawwaminni na 8-Kwafi don Koyarci Daidaitaccen Haɗin Kwafin LW25-126 Don Koyarcewa Game Da Hukuma

1. Tashin Karamin Farko

Kafin karamin farko, kadan da za suka samun abubuwan da ke ciki:

• Tattalin Siyasa da Ilimi: Tattara ilimin siyasa, masana'antar fanni, da kuma tattalin siyasa na inganci. Yawan yakin yana da muhimmanci a kan tattalin da suka rarrabe.

• Binciken Zaberi: Bincike zaberin da aka fi sani daidai, kusurin zaberi, da kuma tattalin zabe da kayan aikata a kofin da biyu don bincike adadin mafi girma a kan kayan aikace-aikacen da suka rarrabe a lokacin farko.

• Tayyaran Inganci da Abubuwa: Sanya inganci da abubuwan da aka bukata a kofin da biyu. Amfani da hanyoyin da suka rarrabe a kan tsirrai. Da'a juyin da ya kamata a kan duka ingancin da abubuwan, sama da nau'o'in da adadin.

2. Masu Nuna A Lokacin Farko da Hanyoyin da Suke Rarrabe

Kafin karamin farko, yi wadannan binciken da biyu:

• Binciken Abubuwan Daga Barazan: Bincike cewa abubuwan (misali, relays) da a cikin mekanismi na gudanar su ne da a cikin wani. Yawan yakin yana da muhimmanci a kan binciken abubuwan da ke fitar da kuma cewa ba suna da kusa.

• Binciken Kayan Porcelain: Bincike kayan porcelain cewa ba suna da kusa ko kusa. Idan akwai rayuwa, kama da bayanin da ba ta da kusa (NDT). Ko kuma bincike cewa idan da kayan da flange ba su ne da aikace-aikace da sahihi.

• Binciken Abubuwan da Kayan: Bincike cewa bolts, sealing gaskets, sealing grease, lubricating grease, da kuma abubuwan da suka rarrabe ne da a cikin wani da su ne da aikace-aikace.

Farkon Misaunen Takarda

• Yi amfani da crane da kuma wanda ya fi sani da shiga crane waɗanda.

• Maidakarwa da wanda ya fi sani da shiga crane suna da muhimmanci a kan binciken cewa ba suka rarrabe barazan ko kayan aikata a kofin da biyu.

• Duk wanda ba suka shiga crane suna da muhimmanci a kan binciken cewa ba suka rarrabe.

• Ba suka yi amfani da kusan shim da kusa ɗaya bayan misaunen takarda, da kuma kusan shim da kusa ɗaya mai tsirrai mai girma da 10 mm.

Farkon Crossbeam da Mekanisman Gudanar

• Crossbeam da mekanisman gudanar ne da wani. Yi amfani da kusan lifting slings a lokacin hoisting - wanda a cikin crossbeam da kuma wanda a cikin mekanisman gudanar - don binciken cewa ba suka rarrabe.

• Kafin farko, bincike cewa crossbeam ne da aikace-aikace da kuma ana da tsari mai girma.

Farkon Pole Column Main

• Bincike cewa flange surfaces na kayan porcelain bushings ne da a cikin wani horizontal plane.

• Kisan gabatar da center-to-center distance da a cikin har pole column ba suka girma da 5 mm.

• Yi amfani da torque wrench don kawo bolts connecting the pole column to the crossbeam, bincike cewa torque values ne da a cikin tsari mai girma da aka bayar da shi.

Connecting Linkages, Secondary Wiring, Primary Leads, and SF6 Piping

Linkage Connections

• Sequence: First connect the linkage between the pole column and the operating mechanism, then connect the linkages between pole columns.

• Apply a mixture of engine oil and molybdenum disulfide lubricant to the pin joints to ensure smooth operation.

Secondary Control Wiring

• Ensure correct wiring with no loose or false connections.

• Each secondary wire must be fitted with a clearly and accurately labeled wire marker to facilitate future troubleshooting.

Primary Lead Connections

• Ensure contact surfaces of the terminal clamps are flat and clean.

• If oxidation is present, polish the surface with sandpaper. For silver-plated surfaces, use the backside of the sandpaper to avoid damaging the plating.

• Apply a uniform layer of electrical compound grease after cleaning, with a thickness of no less than 1 mm.

• When inserting bolts, orient the bolt head downward and the nut upward (to facilitate detection of loosening).

• Tighten bolts diagonally in sequence to ensure even pressure distribution.

SF6 Gas Piping Connections

• Ensure all joints are tightly sealed. Use PTFE (Teflon) tape as a secondary sealant on threaded connections if necessary.

Gas Charging Procedure

• After connecting the charging equipment, slightly open the gas cylinder valve to purge air from the charging hose for approximately 3 minutes, ensuring the hose is free of contaminants.

• Wipe the circuit breaker’s gas inlet port with a lint-free cloth dampened with anhydrous alcohol until completely clean and dust-free.

• Charge the gas slowly to prevent frost formation on the cylinder or piping.

• Fill to the rated pressure of 0.5 MPa.

3. Testing and Inspection

After installation, perform the following tests to verify work quality:

DC Resistance Test

• With the circuit breaker in the closed position, perform the test phase by phase (A, B, C).

• Requirement: DC resistance of each phase must be less than 40 µΩ.

Mechanical Characteristic Test

The following tests and reference values are required (see Table 1):

Table 1. Reference Values for Mechanical Characteristics of LW25-126 Circuit Breaker

Moisture (Micro Water) Test

• Conduct the test at least 24 hours after gas charging.

• Requirement: Moisture content in the arc extinguishing chamber must not exceed 150 µL/L.