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An Analysis Of The Causes Of Accident Of Male IC Socket
Jun 30, 2017

An Analysis of the Causes of Accident of Male IC Socket
Analysis of the technical reasons of the accident
(A) operation failure
Operation failure performance for male IC socket drag or malfunction. As the most basic high-pressure male IC socket, the most important function is the correct action and quickly remove the power grid failure. If the male IC socket drag or malfunction, will constitute a serious threat to the power grid, mainly: ①) to expand the scope of the accident, may have only one circuit failure to expand the entire bus, or even all, the whole plant power outage; Extend the fault removal time, will affect the stability of the system and increase the degree of damage to the controlled equipment; ③ cause non-full phase operation. The result often leads to abnormal operation of the grid and the occurrence of oscillation, easy to expand into a system accident or a large area of power outages. E.g. A power plant in the trumpet generator shutdown cracking operation, the sleeves SW2 a 220 less oil male IC socket rod strength is insufficient and broken, B phase is not broken, resulting in non-full phase operation, Male IC Socket so that the main transformer 4 neutral point The spark spark discharge, arc and 220kV east busbar, so that the bus differential protection action, No. 2 generator and two lines trip, and because of the impact of negative sequence current, so that the generator rotor pole main insulation is almost all damaged.
The main reasons for the failure of the operation are:
(1) operating mechanism defects;
(2) male IC socket body mechanical defects;
(3) to operate (control) the power supply defect.
Specific analysis is as follows.
1. Operating mechanism defects.
The operating mechanism includes an electromagnetic mechanism, a spring mechanism and a hydraulic mechanism
   Field statistics show that the operating mechanism is the main reason for the failure of operation, accounting for about 70%. Electromagnetic and spring mechanism, the main reason for its mechanical failure is the card astringent is not flexible. Where the astringent, either because the original adjustment is not flexible, it may be due to poor maintenance caused by mechanical failure caused by another reason is improper adjustment of the lock, running male IC socket jump (trip) is mostly For such reasons. The connection parts loose, displacement, mostly because the screws are not tightened, the pin is not good or the original anti-loose structure is flawed. It is worth noting that loosening, displacement failure is much more damage than parts, we can see that the significance of preventing loosening is no less than preventing damage to parts.
   Male IC Socket For hydraulic mechanisms, the mechanical failure is mainly caused by poor sealing, so it is particularly important to ensure that the high hydraulic pressure is reliable.
   The electrical defects caused by the organization of the accident, mainly by the auxiliary switch, micro switch caused by defects. Auxiliary switch failure is not to switch the majority, which often cause the operating coil burned. In addition, the fault is due to poor contact after switching caused refusal. Male IC Socket Micro-switch mainly refers to the hydraulic mechanism on the interlock, protection switch. There are SW6-type fault statistics show that its micro-switch failure accounts for about 50% of its electrical failure. In addition to auxiliary switches, micro-switch defects, the mechanism of electrical defects in the proportion of the largest secondary circuit failure. For these "supporting roles supporting role" should also be taken seriously. E.g.
  (1) Male IC Socket a power office of the 220kV substation, the main transformer SW6 ~ 220 male IC socket C phase in the running steal, resulting in non-full phase operation, resulting in serious consequences. The reason is that the C-phase mechanism of the gate line leads to wear, and the iron yoke window discharge, constitute the DC system cathode ground. And because the substation insulation monitoring device failure, and can not be found in time, the instrument class in the operation and mistakenly touch the positive, resulting in DC two ground, so that male IC socket C steal.
  (2) a substation SW6 a 220 less oil male IC socket, in the maintenance, the second line connected to the wrong, so that failure male IC socket refused to expand to all the power outage.
   (3) a power plant SW6 a 220 Ⅰ less oil male IC socket, the CY3 mechanism of the F4 auxiliary switch, due to poor manufacturing quality, contact elasticity is insufficient, like non-access. When the line failure, the male IC socket can not be properly opened, so that male IC socket failure protection action, 220kV bus power failure, less transmission 155,000 kW • h, less electricity 75,000 kW • h.
2. Mechanical defects of male IC socket body
   Resulting in male IC socket ontology failure of the defects, all mechanical defects. Including damage to the porcelain, loose parts, parts damage and foreign matter astringent. For example, a power plant on the 3rd generator a transformer SW7 a 220 less oil male IC socket, in the grid operation when the C phase refusal, resulting in non-full phase operation, so that 220kV bus, line male IC socket trip, Less power generation 400,000 kW • h. The cause of the accident is that the male IC socket operation has reached 3600 times, parts wear serious, straightening mechanism deformation, but not timely maintenance, replacement, and finally lead to accidents.
   SW7 a 220 less oil male IC socket has a special "late move" failure, the reason is: the male IC socket interrupter and the triangle box of oil is isolated. In order to avoid the operation of the arc chamber oil into the triangular box, the general conductive rods are tightly transferred tightly sealed, when the summer temperature rises, the dynamic seal will often hold the conductive rod, when the male IC socket received gate Command, the conductive rod movement to overcome this hold force, often tens of hundreds to hundreds of millimeters to complete the opening action.