How to use the indicator color correctly? 1. The indicator light (also known as the signal light) is mainly used to attract the attention of the operator or instruct the operator to carry out a certain operation in the way of bright indication, and as an indication that a certain state or instruction is being executed or has been executed. 2. General ...

(1) Before operation, check that the circuit breaker (switch) is in the opening position accordingly to prevent the isolation switch from being pulled and closed with load. (2) There is a locking device to prevent misoperation between the knife switch, the grounding knife switch and the switch, and the reverse operation must be carried out in order. If it is locked and cannot be operated, ...

According to the different ways in which it is installed It can be divided into outdoor disconnector and indoor high-voltage disconnector. Outdoor disconnector refers to the disconnector that can withstand wind, rain, snow, filth, condensation, ice and heavy frost, etc., and is suitable for installation on terraces. According to the different structures of its insulating pillars ...

1. The circuit breaker is equipped with an arc extinguishing device, so the circuit breaker can be operated with load, but it cannot operate the current of the load. The disconnector does not have an arc extinguishing device, and it can operate places where the load current is less than 5A, but it is generally not suitable for operation with load. 2. And the circuit breaker ...

1. Pull together the voltage transformer and lightning arrester under normal conditions. 2. Pull together the 220kV no-load bus. 3. The neutral point of the transformer when there is no ground fault in the latching grid. 4. Pull the bypass current that is closed by a switch or an isolated switch. 5. Outdoor vertical splitting triple isolation ...

Rated voltage: The rated voltage of the disconnector (KV) = the nominal voltage of the circuit * 1.2/1.1 times. Rated current: The standard value of rated current should be greater than 150% of the maximum load current. Rated Thermal Stability Current: Select a rated ...

(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 ...

1) Clean the dust on the surface of the porcelain, check whether the surface of the porcelain is glazed or damaged, whether there are cracks and flashover marks, and whether the iron and porcelain joints of the insulator are firm. If the damage is severe, it should be replaced; 2) Wipe the oil stains on the blades, contacts or fingers with gasoline and check the contact ...

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. The overheating of the contact part of the disconnector during operation is caused by ...

(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 ...

1. The basic conditions for the use of low-voltage isolation switches (1) The altitude does not exceed 1000 meters; (2) The ambient temperature is not higher than +40°C and not lower than -40°C; (3) The relative humidity is not more than 85% (relative to +20±5°C). 2. The low-voltage isolation switch is not suitable for the following ...

1. Through the isolation switch, it plays a good insulating role, so that the whole circuit can be safe and secure, and the maintenance personnel or staff also have enough ability to repair the circuit. 2. At the same time, the low-voltage isolation switch can also change the operation mode of the circuit, which is used in the power plant or gas plant.

1. When overhauling electrical equipment, provide an electrical interval and a visible disconnection point to ensure the personal safety of maintenance personnel. 2. The disconnector can not be operated with load: it cannot be operated with rated load or large load, and it cannot be divided or combined with load current and short circuit current.

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 ...

1. Frame circuit breaker (universal type) - ACB: Rated current: In principle, frame circuit breakers are required for rated currents above 630A, and molded case circuit breakers are generally below 630A. It can be seen that the rated current of the frame circuit breaker is much larger, generally 630A-6300A. In addition in segments can ...

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...

1. Altitude: 2000m and below; 2. Ambient temperature: -25°C-+40°C; 3. Relative humidity: the daily average value is not more than 95%, and the monthly average value is not more than 90%; 4. Places without conductive dust, corrosive gases and water vapors; 5. No fire ...

1. The high-voltage load switch can be broken with load and has the function of self-extinguishing arc, but its breaking capacity is very small and limited. 2. The high-voltage isolation switch is generally not able to break with load, there is no arc extinguishing cover in the structure, and there is also an isolation switch that can break the load.

1. For vertical installation, the switch frame, closing mechanism, cable sheath, and protective steel pipe should be reliably grounded (not connected in series). 2. Before operation, several no-load opening and closing operations should be carried out, and each rotating part should be free of jamming, closing in place, and there should be enough safety distance after opening. ...

1. It can isolate the power supply, have obvious disconnection points, and is mostly used for fixed high-voltage equipment. 2. It has an arc extinguishing device and a certain opening and closing speed, and can pass the normal working current and the specified short-circuit circuit in the closing state. 3. It is strictly forbidden to turn on and off the circuit with load.

1. It can isolate the power supply, with a significant disconnection point, and is mostly used for fixed high-voltage devices; 2. It has arc extinguishing equipment and a certain opening and closing rate, and can pass through the normal working current and the specified short-circuit circuit in the case of closing; 3. It is forbidden to connect and cut off the circuit with load, ...