s with Changma electric 馘 generation temperature rise limit resistance method, that is, the human level is 60, the level is 7513 level is 80, the level is 100, the level 4 is 125=, 6 miscellaneous accounts are reduced, the meter can be inserted into the machine The screw hole of the seat ring is connected with the iron core.
The temperature of the rolling bearing should not exceed 95, and the temperature of the sliding bearing should not exceed 80. The temperature is too high, which will change the oil quality and damage the oil film. The thermometer should be inserted close to the outer ring of the ball bearing or the lower bearing of the plain bearing. If the bearing cap temperature is measured, its value is 1525 lower than the outer ring. For example, the oil temperature in the upper layer of the oil sump is 150.
In practice, the temperature of the case is often based on the fact that it is not hot.
The squirrel-cage rotor surface has a large stray loss and a high temperature, which is limited to the extent that it does not endanger the adjacent insulation. It can be estimated by pre-painting non-reversible paint.
When any of the following conditions occur, the motor has a fault temperature that exceeds the maximum operating temperature.
Although the temperature rise exceeds the regulation or the temperature rise does not exceed the regulation, the temperature rise suddenly increases at low load.
The two types of faults are judged and eliminated by the temperature rise at rated load not exceeding the temperature rise limit, and the motor temperature exceeds the maximum allowable operating temperature only because the ambient temperature exceeds 40. This phenomenon indicates that the motor itself is normal. The solution is to use artificial methods to reduce the ambient temperature. If it is not possible, the load must be reduced.
The temperature rises above the rating plate under rated load. No matter what the situation is, it is a fault, it must be stopped, especially when the temperature rise suddenly becomes larger. The external reason is that the grid voltage is too low or the line voltage drop is too much over 10, the load is too heavy, the motor and the machine are not properly matched; the internal reasons are; the single-phase operation is short-circuited between the phases, the stator grounding fan is damaged or the air duct is not fastened. Broken bearing damage, stator and rotor phase rubbing motor and cable joint heating, especially copper-aluminum or aluminum-aluminum connecting motor is corroded or damp. In addition, in theory, the motor can be reversed, but some fans of the motor have directionality. If it is reversed, the temperature rise will exceed many. In short, troubleshooting must be addressed for each specific situation.
Solving the type 6 circuit breaker liquid 1 mechanism leakage oil 4 The current domestic majority of 0kV voltage level 2 circuit breakers and all 220 circuit breakers use hydraulic mechanisms, but can not use spring mechanism. Leakage of the hydraulic machine 1 has become a major problem for the power industry, and it is difficult to solve the leakage of oil.
1. The question of existence exists in the bureau. There are 23 sets of double 6220 type circuit breakers, and 16 sets of 1 Jia 60 type circuit breakers. The operating mechanism is hydraulic mechanism. Since 1992, the circuit breaker has been in operation for nearly 8 years. During the operation, the hydraulic mechanism often leaks oil, causing frequent pressure. After seven times, the treatment effect is still not satisfactory, which seriously affects the safe operation of the circuit breaker. To this end, we have tackled the question of the existence order. According to statistics, most of the leakage points of the mechanism are concentrated in the following positions: 1 high 4 pressure tube ferrule joint; 2 low pressure rubber tube joint; 3 vent hole and mechanism bulk head; 4 high pressure + oil drain valve and control valve connection Part; 5 signal cylinder rotation and pressure components.
VII. Formulate the solution for the leakage at the interface of the tube clamp. 1 We have studied the sealing structure, analyzed the sealing principle, found out the cause of the leakage, and reconnected the pressure tube ferrule interface in combination with the power failure. . Because it is necessary to press 3, 0.35mm groove in the steel pipe seal 1 before the upper ferrule, this seal is the main seal. Seal 2 is to reduce the flaring after the torque is applied to the joint nut during installation, so that the round mouth shrinks and presses on the tube + wall to form the secondary seal. This creates two seals at the pipe joint. However, in our daily work, the high-pressure oil pipe used has a phenomenon that the outer wall is not round, the material of the ferrule is not suitable, and the shrinkage is not good. Today, especially the seal is 2, because the processing technology is not precise enough, the number of inner guide angles Not enough, no matter how much less force and less force does not shrink at all and can not be reliably sealed, so it should be replaced with a new qualified card sleeve to ensure that the two seals are in place. Attached to the early production and product of Jia 6 type circuit breaker hydraulic mechanism, the low pressure oil pipe of the fuel tank is made of rubber hose. After several years of operation, all the aging phenomenon occurs, especially in the equipment run by our bureau. Leakage outside the tubing in summer is particularly serious. After the investigation of the manufacturer, it was found that the stainless steel wire metal hose has been used to solve the leakage problem. It is easier to handle the venting holes and the bulkhead of the mechanism. As long as the contact surface and the sealing surface are cleaned and the qualified seals are replaced, no leakage will occur. The connection between the pressure release valve and the control valve is mainly due to the connection pipe under the pressure release valve, and there is a copper washer at the fixed position of the control valve. When the thickness of the copper washer is not required, it is easy to cause seepage. Oil, as long as the thickness of the copper meets the requirements, it can solve the oil leakage in the two parts of the leakage component. Because it is rotated frequently under the pressure of 32.6 and 1 for a long time, the seal is fixed with wear, so there is slight oil leakage, but not Will affect the normal operation of the circuit breaker, so there is no need to deal with it.
3. Organizational implementation effect As the cause of leakage has been found, combined with the maintenance of the equipment, we have modified the hydraulic mechanism of the power failure maintenance of the bureau, and the sealing points that are prone to leakage of the hydraulic mechanism are processed according to the established plan. The operation test has achieved good results.
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