Performance characteristics of TBP overvoltage protector
A new three-phase combined zinc oxide overvoltage protector. It is a new type of combined structure lightning arrester produced in China . 　　
This type of TBP overvoltage protector is in series with a series gap type, and has a large breakthrough in the wiring mode, unlike the conventional Y wiring method. In the past, the Y wiring method was to directly connect the center point, and the TBP overvoltage device was grounded after connecting a zinc oxide arrester element in series at the center point of the Y wiring. This is a big change from the technical point of view. It makes two zinc oxide arrester elements connected in series, whether they are relatively phase-to-phase. Therefore, as long as the technical characteristics ensure relative discharge characteristics. In combination with the insulation of the high-voltage motor, the discharge characteristics of the phase can be matched with the insulation of the high-voltage motor ; that is, the discharge characteristics of the TBP over-voltage protector and the discharge characteristics between the phases The insulation of the high-voltage motor is consistent in terms of protection performance. The characteristics of the TBP over-voltage protector are summarized as follows:
4.1 This is the TBP overvoltage protection gap MOA a class by the presence of the gap, whether the normal operation or the single-phase ground fault, as long as the over-voltage does not exceed the operating voltage of TBP, TBP overvoltage protector in It does not flow current, at this time it has a zero charge rate, delays the aging of components, and improves reliability.
4.2 Due to the existence of the gap, U1mA can be made very low, 10KV U1mA=16.5KV , 6KV U1mA=10.5KV . Therefore , the operational residual voltage of the TBP overvoltage protector is much lower than the residual voltage of the same product under the same inrush current.
4.3 Due to the special structure, the phase-to-phase overvoltage can be greatly reduced. Compared with the conventional zinc oxide arrester, the overvoltage between the phases and phases is reduced by at least 60~70% , which reliably protects the protected electrical equipment.
Comparison of TBP overvoltage protector and zinc oxide arrester
For the combined structure of the overvoltage protection TBP brings excellent properties is beyond reproach, but the presence of TBP over-voltage protector guard interval, so that it is a conventional band gap as MOA, raises objections:
5.1 Due to the existence of the gap, the operation overvoltage, power frequency transient overvoltage, etc., as long as the amplitude does not exceed the operating voltage of the TBP overvoltage protector, the oxidation of the zinc oxide arrester valve is not affected, and the reliability is improved. At the same time, however, the zinc oxide arrester has a series of advantages such as good nonlinear characteristics, strong over-voltage energy absorption, and fast response.
5.2 The existence of the TBP overvoltage protector gap makes the positive effect of the overvoltage and atmospheric overvoltage of the zinc oxide arrester valve plate disappear.
5.3 In the past, silicon carbide arresters with gaps were unstable due to moisture, and this defect still exists on TBP overvoltage protectors.
Source of information : http:// overvoltage protection device
Overvoltage protector      Http://?id=4
Overvoltage protector      Http://?id=4
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Overvoltage protection device    Http://?class_id=4
Overvoltage protection device    Http://?class_id=4
Overvoltage protector      Http://?class_id=4
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