1. Insist that the air is moist or unclean, and the pipes are not clean, which may have the following consequences:
(1) The wet gas is decomposed into mixed gases such as hydrogen and oxygen under the effect of arcing, and the insulation between the fractures after the main contact is broken is destroyed, which is difficult to arc or arc re-ignition, and in severe cases, the arc extinguishing chamber will burst.
(2) The insulation strength of the supporting porcelain bottle and the arc extinguishing chamber is reduced, and the discharge along the surface is formed.
(3) Foreign objects such as patent leather and rust slag in the pipeline may block the air port, causing the main circuit breaker to malfunction and cause the phenomenon of jamming.
(4) If the foreign matter enters the arc extinguishing chamber, it may form a poor contact of the main contact, which will cause the nonlinear resistance to burn due to long-term energization, and in severe cases, the nonlinear resistance will be formed and the porcelain bottle will burst.
Therefore, an oil-water separator is installed on the inlet pipe of the main circuit breaker air storage cylinder, and there is a water discharge valve at the lower part, and the water should be drained regularly during operation and maintenance to insist on the clean air circuit.
2. Replace rubber parts regularly
The main circuit breaker is a kind of pneumatic and electrical structure with messy structure, and each component has high requirements for sealing function, so in order to ensure outstanding sealing function, rubber parts should be replaced regularly.
3. Check the main components regularly
Each primary component should be regularly reviewed to maintain the outstanding skill status.
(1) Arc extinguisher
The dynamic and static contacts will be worn out due to the conflict between the dynamic and static contacts due to the frequency of division and combination, so as to reduce the overtravel and reduce the contact pressure. When the overtravel is reduced to a certain extent, the dynamic and static contacts should be replaced. When the deformation of the moving contact recovery tension spring exceeds a certain limit, it is necessary to replace it in time.
(2) Nonlinear resistance
Adhere to the internal control and cleaning of nonlinear resistance porcelain bottles, excellent sealing, and regularly replace the desiccant in nonlinear resistance porcelain bottles. Detect the resistance value of the nonlinear resistor, and when the resistance value changes beyond a certain limit, it is necessary to replace it in time.
(3) Main valve
Check the size of the cooperation between the piston and the valve body regularly, and replace it in time if the size does not meet the requirements.
(4) Transmission air cylinder
Properly adjust the buffer of the transmission air cylinder to ensure that the disconnector operation is excellent. Check the accuracy of the cooperation between the piston and the cylinder block at regular intervals, and ensure its outstanding operation by trimming or replacing parts.
(5) Ventilation plug door
It is necessary to replace the packing material in the plug door regularly, check the ventilation volume of the plug door, and adjust it to the promised range.
1. Voltage quick break maintenance
When the line is short-circuited, the bus voltage drops sharply, and when the voltage drops to the voltage maintenance setting value, the low-voltage relay acts, jumps the circuit breaker, and instantly removes the fault. This is called voltage quick break maintenance.
Second, the current quick break maintenance
Current quick break maintenance is divided into no time limit current quick break and time limited current quick break, when the line presents a problem, no time limit quick break maintenance can act instantaneously, but it can only be a part of the line, with time limit current quick break maintenance can maintain the whole line in addition to the time limit speed break maintenance is a time limit difference greater than the next level of line no time limit maintenance, so when the first end of the next section of the line is short circuit, the maintenance will not be misoperated.
3. Differential quick-break maintenance of transformer
Differential maintenance is the main maintenance of the transformer, which is installed according to the principle of circulating current.
It is mainly used to maintain various interphase short circuit faults that occur inside the winding of double or triple winding transformer windings and their lead wires, and can also be used to maintain transformer single-phase inter-turn short circuit faults.
Differential quick-break maintenance, in order to prevent the differential maintenance from being rejected due to the addition of high-order harmonics that occur when the current transformer is full at a high short-circuit current level, and a large braking torque occurs; When the short-circuit current reaches 4-10 times the rated current, the quick-break component is quickly exported
Differential maintenance is very useful and can instantly remove the entire line of faults, and is generally only used for component maintenance, such as transformers and generators. The principle is to compare the magnitude and direction of the current on both sides of the element.
Current quick break maintenance reflects the problem of interphase short circuit, and is widely used in 10-35KV distribution lines and small-capacity transformers. Its action current is set according to the short-circuit current, the value is large, as long as the short-circuit current at the beginning of the line will be greater than its action current, that is, the quick-break maintenance will act, so its maintenance scope is limited to the first part of the line.
The function of the time-limited quick break:
The MGK31C recloser controller is an outdoor controller specially designed for ZW □ permanent magnet switches of medium voltage 35kV and below. It can be convenient to cooperate with the permanent magnet switch on the column to realize the management of opening and closing... Line maintenance function ̈ Overcurrent I.Section: Quick break maintenance function ̈ Overcurrent II.Section: Time-limited quick-break maintenance ̈ Overcurrent III.Section: Time-limited overcurrent maintenance ̈ Active overlap
Overcurrent maintenance function:
Over-relay current maintenance appliances have overload, locked-rotor, overvoltage, undervoltage, phase failure, current unbalanced maintenance functions, overcurrent maintainers can be used for any type of three-phase motor for fast and reliable maintenance. The overcurrent maintainer has the characteristics of simple structure, easy to use, low price, no power consumption, long life and small size.
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