Công ty TNHH công nghệ số Tân Thành

Rơ le hơi, Transformer Gas Relay QJ2-40TH QJ3-40TH

Rơ le hơi, Transformer Gas Relay QJ2-40TH QJ3-40TH

  • Đăng ngày 17-04-2019 12:04:31 AM - 979 Lượt xem
  • Mã sản phẩm: QJ2-40TH QJ3-40TH
    • product description:

      The QJ type gas relay is a kind of protection device used in the fully sealed transformer. The gas relay is hereinafter referred to as a relay, and is installed on the fully sealed transformer fuel tank. When the internal fault of the transformer causes the transformer to decompose the oil to generate gas or oil off the shelf, The contact of the gas relay acts to turn on the specified control loop and signal in time or automatically remove the transformer power.
      QJ2-40 multi-function gas relay product details:
      1. The floating ball adopts imported stainless steel material to completely solve the problem of oil absorption aging and floating.
      2. The gas detection range is large, and the problem of frequent alarms and trips is completely solved.The oil level of the alarm signal and the cutoff signal can be set as needed.
      3. With installation detection function. When the product is installed and wired, the probe can detect whether the wiring is correct, whether the alarm signal and the cutting signal can be output normally.
      4. With low oil level alarm function.
      5. With oil level display function, you can observe the oil level above the cover through the left window, and observe the oil level below the cover through the right window.
      6. Has the function of with pressure relief valve.
      7. With temperature display alarm function. The temperature sensor outputs a temperature signal to display the transformer oil level temperature on the remote temperature display controller, and can issue an alarm or cut-off signal that limits the temperature. 


    Tình trạng sản phẩm:

    working principle:
      When the transformer is in normal operation, the inside of the gas relay is filled with transformer oil. When there is a fault inside the transformer, the gas generated by the decomposition of the transformer oil collects in the gas collecting chamber of the relay. The air pressure forces the oil level to drop, the float decreases with the oil level, and the magnetic switch is connected in parallel. K1 or K2 is closed (QJ2-40TH-S type K1a, K2a closed, K1b, K2b open). 

    When the gas reaches the alarm gas volume, the magnetic switch K1 is sucked (QJ2-40TH-S type K1a is closed, K1b is turned on), the signal circuit is turned on, and an alarm signal is issued. If the oil level in the fuel tank drops due to other reasons (such as oil leakage), the alarm circuit is also applied to the signal circuit. 

    When a serious fault occurs inside the transformer, a large amount of gas will be generated. When the gas reaches the volume of the cut gas, the magnetic switch K2 is sucked (QJ2-40TH-S type K2a is closed, K2b is turned on), a cutting signal is issued, and the cutting device is operated. The transformer is cut off from the grid to protect the transformer. 

    The main technical parameters:
    ● Working temperature: -30 ° C ~ +120 ° C
    ● Pipe diameter: φ40mm
    ●Contact capacity: AC 220V 1A DC 220V 0.5A
    ● Sealing test pressure: 200kPa 20min 
    Production considerations:
    The waterproof measures of the main body gas relay of the transformer are not perfect. When it rains or when the snow melts, the water droplets are easily dripped into the junction box through the oil pillow. Lightning will cause DC ground fault, but the transformer protection will cause false vibrations, light gas signals and even heavy gas protection actions, causing switching on both sides of the transformer. .

    5 Installation and commissioning

    5.1 Installation 
    of the relay 5.1.1 The relay of the new factory must be taken out before use and the tie-in strap for transport fixing must be removed. Also check whether all the fasteners are loose, whether the open cup (float) and the baffle are flexible, and whether the contacts are reliably opened and closed. 
    5.1.2 The relay shall be installed on the connecting pipe between the oil tank of the oil-immersed transformer and the oil conservator. The inner diameter of the connecting pipe shall be the same as the pipe diameter (caliber) of the relay. The arrow on the relay must point to the oil conservator. . Allow the oil storage tank end to be slightly higher, but the inclination of the axis of the joint pipe and the horizontal plane shall not exceed 4%, or the method of installing the inclined gas pipe shall be adopted to make the gas inside the transformer smoothly enter the relay. 
    5.1.3 In order to facilitate the inspection of the gas relay at the operating site, the installation position should ensure that the relay core can be smoothly removed from the housing. The QJ4-25 type has a height of 130mm, and the QJ-50 and 80 have a height of 150mm. 

    5.2 Debugging 
    gas relay is an important protection device for oil-immersed transformers. Therefore, the operating department has special regulations. For example, it must be commissioned, calibrated and certified by the inspection department before it can be put into use. Therefore, commissioning and oil speed setting work should be carried out in accordance with relevant regulations. . 
    5.2.1 Adjustment of gas volume 
    change The position of the reed contact can be adjusted to adjust the gas volume of the signal contact. When the reed contact moves up, the gas volume decreases, and when the reed contact moves down, the gas volume increases. Tighten the locking screws after adjustment. 
    5.2.2 Adjusting the oil speed Adjusting the 
    spring-connected adjusting rod can change the pulling force of the baffle spring, and can change the oil speed of the tripping contact action (the relay is set at the factory, the value is shown in the certificate), and should be locked after adjustment. Nut. The action speed setting work should be performed by a professional on a dedicated flow rate calibration device. 
    5.2.3 Adjusting the rotation angle of the baffle 
    Adjusting the stop screw can change the rotation angle of the baffle to adjust the distance between the magnet and the reed contact (0.5~1.0mm), so as to ensure the reliable opening and closing of the reed contact. 

    6 Maintenance, repair

    6.1 The relay shall be visually inspected annually for reliability and reliability of the signal loop and reliability of the trip circuit. 
    6.2 The relay that has been operated should be opened once every two years for internal structural and operational reliability checks. 
    6.3 The relay that has been operated shall be tested for the power frequency withstand voltage every five years.




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    Thông Tin Công Ty

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    Trụ sở: Số 243 (số 2/185) Đường Chùa Láng, tổ 11, Phường Láng Thượng, Quận Đống Đa, Thành phố Hà Nội
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