Counterfeit zinc oxide arrester identification method

In addition to counterfeiting, no testing, and poor craftsmanship, parallel imports often use some falsification techniques.

First, inferior rubber.

Manipulation: Use cheap rubber instead of silicone rubber (such as doped with ethylene-propylene rubber, secondary rubber, etc.).

Hazard: The life of the jacket is seriously degraded (especially under high temperature or strong sunlight, it will obviously age in a few days).

Identification: It is necessary to carry out the tracking and electric corrosion test, which cannot be identified by ordinary users. (Some alternative rubbers will be unusually bright, even higher than the brightness of silicone rubber itself, it is difficult to identify by the naked eye)

Second, inferior zinc oxide resistors.

Manipulation: Use fake formulas without adding precious elements, use the pieces removed from the old goods, and use defective defective pieces.

Hazard: The arrester is easy to explode under high current, and it is easy to damage without damage under normal use.

Identification: A large current test is required and cannot be identified by ordinary users. (Under the small current test of the conventional test equipment, all the parameters of this type of resistor are normal)

Third, the rate of fixed resistors.

Manipulation: Use ordinary plastic cylinders or heat-shrink tubing to replace the non-belt belt or regular insulation cylinder to reduce the cost of raw materials.

Hazard: There is an internal flashover channel in the arrester, which easily leads to a sudden increase in the endless leakage current during use, causing system failure.

Identification: It can only be opened and opened, provided that the user knows what the regular product is.

Fourth, the diameter of the resistor is reduced.

Manipulation: Use a small diameter resistor to reduce the amount of resistors. For example, use S-type film for Z-type product; use Z-type film for R-type product; use current 2.5 motor chip for current 5 generator type product and so on.

Hazard: The arrester cannot meet the design requirements and will seriously endanger the safety of the protected equipment.

Identification: It is possible to compare the weight and diameter with the same model of the previous state-owned factory. It is obviously light and thin. The fraud is so powerful that even the iron electrode is used to replace the aluminum electrode to make a fake. Even if the weight is not found, it must be taken apart. (In recent years, many medium-voltage surge arresters produced by state-owned factories are produced by outsourced signboards, and their products cannot reflect the true technical capabilities of the plant.)

Fifth, do not do the overall vulcanization, switch to a set of products.

Manipulation: Do not do the overall vulcanization, change to manual set, to save the investment of valuable equipment such as vulcanizing machine. And can be continuously disassembled, there is no concept of scrap rate. This is a common method used in second-hand renovation.

Hazard: In the jargon, this is a pseudo-silicone rubber product. It has no advantages of silicon rubber product insulation. It can't be matched with miniaturization and complete sets of equipment. Otherwise, it will easily lead to short-circuit accident when it is too close to other high-voltage electrical appliances. If there is no strict moisture-removing measures in the room, the sealing performance will be even worse. Even if it is not used in the miniaturized equipment, the insulation accident will occur in batches after half a year of use.

Identification: The identification of the package product is relatively easy. It is only necessary to remove the metal parts (screws, upper and lower covers, chassis, etc.) outside the arrester to see if the whole is sealed by silicone rubber without adhesive.