1. What are the common faults?
Answer: The common faults of the disconnector are: (1) The contact part is overheated. (2) Porcelain insulation damage and flashover discharge. (3) Refuse to pull and close. (4) Wrong pulling and closing.
2. What is the cause of overheating of the contact part of the disconnector during operation?
Answer: The disconnector overheats during operation, which is mainly caused by excessive load, increased contact resistance, and incomplete closure during operation.
3. What are the reasons for the increase of contact resistance of the disconnector?
Answer: The reason for the increase of contact resistance is: the repulsion force at the contact between the blade and the knife tip is very large, and the knife edge is not tightly closed, resulting in surface oxidation and increasing the contact resistance. Secondly, the disconnector will cause arcing and burn the contact during the pulling and closing process, so that the contact resistance will increase.
4. How can I tell if the disconnector contacts are overheated?
Answer: It can be judged according to the change in the color of the discoloration paint or temperature test piece in the contact part of the disconnecting switch, and it can also be determined according to the color darkening of the blade. Generally, it is determined according to the results of infrared temperature measurement.
5. How to deal with overheating of disconnector contacts and contacts?
Answer: When it is found that the contacts and contacts of the disconnector are overheated, first report the dispatch, try to reduce or transfer the load, strengthen the monitoring, and then deal with it according to different wiring:
(1) Double bus wiring. If the knife switch on the bus side is overheated, the overheated isolation switch will be withdrawn from operation through the inverted bus, and the power will be shut down for maintenance.
(2) Single bus wiring. It must be reduced in load, monitored and taken to cool down, and discontinued if possible.
(3) Switchable bypass circuit breaker with bypass circuit breaker.
(4) If the line-side isolation switch is overheated, the treatment method is basically the same as that of the single bus, and the power outage maintenance should be arranged as soon as possible. During maintenance, the load should be reduced and monitoring should be strengthened.
(5) Open-loop operation of one half circuit breaker wiring.
(6) For the overheated contacts and contacts of the bus side isolation switch, after pulling the isolation switch, after on-site inspection, if the safety distance of live operation is met, the bus side down wire joint can be electrolyzed, and then processed.
6. How to check and deal with the failure of the electric operation of the disconnector?
Answer: After the electric operation of the disconnector fails, first check whether there is any error in the operation, and then check whether the operation power circuit and power supply circuit are intact, and whether the fuse is blown or loose. Whether the electrical latching circuit is normal.
7. How to deal with the deformation of the contact welding of the disconnector, the damage of the insulator and the serious discharge?
Answer: In these cases, the power should be cut off immediately, and the monitoring should be strengthened before the power outage.
8. How to deal with the disconnector refusing to open and close?
Answer: (1) Due to mechanical failures such as axle pin falling off, wedge bolt exit, cast iron breakage, or because of electrical circuit failure, the tool bar may be disconnected from the operating mechanism, which causes the isolation switch to refuse to close.
(2) Refusal to trip. When the disconnecting switch cannot be opened, if the operating mechanism is frozen by ice, it can be gently shaken, and the various parts supporting the porcelain bottle and the mechanism can be observed, so as to find out the obstacle location according to where the deformation and displacement occur. If the obstacle location occurs in the contact part of the disconnector, it should not be forcibly pulled apart, otherwise the support porcelain bottle may be damaged and cause a serious accident, and the operation mode of the equipment can only be changed.
9. How to deal with the disconnector if it is not in place?
Answer: The isolation switch is not in place, most of them are caused by the corrosion of the mechanism, jamming, maintenance and debugging are not adjusted, etc., in this case, the isolation switch can be pulled and then closed. For the 220KV isolation switch, the insulating rod can be pushed in, and the power failure treatment should be applied if necessary.
The high-voltage disconnector should be overhauled 1-2 times every 2 years.
|
More on that
|
What requirements should be met by Tianyi switch - disconnector?
(1) The disconnector should have an obvious disconnection point, which is easy to identify whether the electrical appliance is disconnected from the power grid.
(2) There should be reliable insulation between the disconnect points of the disconnector, that is, there should be enough distance between the disconnect points of the disconnector to ensure that it can work reliably under harsh climatic conditions, and ...
|
|
Tianyi switch - dual power supply automatic transfer switch operating procedures
1) When there is a power outage for any reason and the power cannot be restored in a short period of time, the backup power supply must be activated
1. Cut off the circuit breakers of the mains power supply (including the circuit breakers of the control cabinet in the distribution room, and the mains power supply cut-off of the dual power switching box), and pull the double-cast anti-reverse switch to the side of the self-provided power supply to ensure that the power supply is protected.
|
|
New product release of TPB1TPL1 button signal light
TPB1 series pushbutton switch is designed by VTeam's senior R&D technical team, which is suitable for a variety of industries and various occasions. TPB1 series pushbutton switches have a complete range of colors, rich colors, economic and durable, easy installation and superior performance. Automated production, testing, and quality control are more stringent, and the products are ...
|
|
Tianyi switch - 9 tests and methods for switching power supply
1. Repeated short-circuit test
◆ Test instructions
The output of the module is short-circuited in various input and output states, the module should be able to achieve protection or retraction, repeated short-circuits, and after troubleshooting, the module should be able to automatically resume normal operation.
◆ Test Method
a ...
|
|
Model introduction of Tianyi cam switch
LW42 series
LW42 series cam switch and safety switch are another series of high-quality products announced by Shanghai Tianyi Electric Appliance Co., Ltd. to meet customer needs.
Device function: personal safety is paramount, LW42 series cam switch and safety switch unique terminal plan ...
|
|
Tianyi switch - the difference between the use of cam switch and load isolation switch
T-cam switches and P-block switches are used in a wide range of standard circuits and currents, and the number of combinations of cam switches is virtually unlimited. Different designs, front panels and dedicated switches ensure optimum sensitivity to meet the requirements.
Q1: P switch and T switch have ...
|
|
Tianyi switch - classification and application of dual power transfer switch
The dual-power automatic transfer switch is mainly used in the emergency power supply system, which automatically switches the load circuit from one power supply to another (standby) power supply switching appliance to ensure the continuous and reliable operation of important loads. Therefore, the dual-power automatic transfer switch is often used in important places of electricity consumption.
|
|
Tianyi switch - the role of air switch
1. The air switch is an important electrical appliance in the low-voltage distribution network and power drive system, which integrates control and a variety of protection functions. In addition to completing contact and breaking circuits, it can also generate short circuits to circuits or electrical equipment. Protection against severe overloads and undervoltages, etc.
|
|
Tianyi switch - how to use the dual power transfer switch correctly
1. When the power is cut off for some reason and the power supply cannot be restored in a short period of time, the backup power supply must be enabled:
(1) Cut off the circuit breakers of the mains power supply (including the circuit breakers of the control cabinet of the power distribution room, and the mains power cut-off of the dual-power switching box), and pull the double-cast anti-backing switch to the side of the self-provided power supply, ...
|
|
Tianyi switching power supply troubleshooting
1. Check the key points:
1) Whether the voltage at point B is 310V.
2) Whether the 15V voltage is normal.
3) Whether the voltage at point C is greater than 14V.
4) Whether the SS terminal of (8) pin IC6 is higher than 10V, whether the SD terminal of pin (10) is lower than 0.6V, and whether there is a square wave transmission at pin 13 and pin 14 ...
|
|
Tianyi switch - the operation sequence of the disconnector switch
(1) First of all, when operating the isolation switch, you should first check that the circuit breaker of the corresponding circuit is indeed in the disconnected position to prevent the load from pulling and closing the isolation switch.
(2) When the line is stopped and the power is transmitted, the isolation switch must be pulled and closed in order. During the power failure operation, the circuit breaker must be pulled first, and then ...
|
|
Tianyi switch - the difference between air switch and leakage protection switch
1. Differences in appearance
Although these two types of switches seem to be very familiar, but there are still differences, half of the leakage protection switch is the same as the air switch, and the other half is not, it is equipped with a test jump button and a recovery button, which are not available in the air switch.
2 ...
|
|
Tianyi switch - common faults and troubleshooting methods of low-voltage switches
1 The contact is overheated
Contact heat is mainly caused by the current flowing through the contact, and there is power loss between the contacts (such as contact resistance loss, arc energy loss). It is normal for the contacts to heat up, but severe heat (overheating) is a malfunction.
The main ...
|
|
What are the specifications and models of Tianyi switch - air switch?
1. Common air switch models in the family
Common family models: DZ series, C16, C32. C40, C80, C100, C120 and other products, of which C represents the starting current, such as: C32 means that the starting current is 32A, which can drive a 6500 watt water heater, C40 ...
|
|
Tianyi switch - the air switch is always the reason for tripping
1. The current value of the air switch is too low, and the load power is greater than the rated power of the air switch.
2. The load joint is not firm, and the joint is not compressed.
3. If there is a short circuit in the line, check whether the electrical plug is dry.
4. The line is aging and leaking, resulting in both the live wire and the neutral line.
|
|
Tianyi switch - the high and low voltage division of low voltage switch
36V is a safe voltage, but it cannot be used as a standard for dividing high and low voltages. There are two ways to divide high and low pressure:
1. According to the rated voltage: the rated voltage is 1000V and below is called low voltage; The rated voltage of 1000V or more is called high voltage.
2. According to the voltage of the equipment to the ground...
|
|
Tianyi switch - the method of adjusting the current of Tianyi switch
1. Change the reference current of the feedback module
Regulating the reference current is the most basic way to regulate the output current of a switching power supply, and it can usually be achieved by rotating a potentiometer or toggling a switch. Changing the reference current allows the magnitude of the feedback current to be compared with it, so as to control the switch ...
|
|
Tianyi switch - a measure to reduce the ripple and noise voltage of the switching power supply
Reduces EMI interference
The metal shell is used as a shield to reduce the interference of external electromagnetic field radiation. To reduce electromagnetic interference from the power line input, an EMI filter is added to the power supply input.
At the output, capacitors with good high-frequency performance and low ESR are used
The use of polymer solids ...
|
|
Where can Tianyi switch - limit switch be used?
daily life
There are many aspects of the use of limit switches, and it is found in many electrical appliances. So what effect can such a simple switch have? It is first and foremost a chain maintenance effect. The most common example is its use in washing machines and tape recorders (video recorders). ...
|
|
Tianyi switch - PCB design considerations for switching power supplies
In the design of switching power supply, the physical design of the PCB board must be proper, otherwise it may cause excessive electromagnetic interference and lead to unstable power supply.
1. The design process from the schematic diagram to the PCB should be rigorous and perfect: the establishment of component parameters ...
|
|
Contact
working hours
