User Manual for KYN28A-12 Switchgear

YouTube：https://youtube.com/shorts/XueL-YKFg7A

### Overview The KYN28A-12 indoor armored AC metal-enclosed switchgear is applicable to functions such as on-off, control or protection in power generation, power transmission, power distribution, power conversion and power consumption in the power system, with a voltage level of 12kV.

### Environmental Conditions for Use - **Temperature**: The maximum temperature is +40 °C, and the minimum temperature is -10 °C.

- **Humidity**: The average daily relative humidity is 95%, and the average monthly relative humidity is 90%. - **Altitude**: Below 2000m. - **Earthquake**: The seismic intensity does not exceed 8 degrees.

- **Air**: The surrounding air should not be significantly polluted by corrosive or combustible gases, water vapor, etc., and there should be no frequent violent vibrations.

### Structural Features - **Enclosure and Assembly**: The enclosure is made of high-quality thin steel plates, which are processed and formed by CNC machine tools. It adopts an assembled structure and is connected by rivets, possessing advantages such as high precision, light weight, high mechanical strength and an aesthetic appearance.

- **Types of Trolleys**: According to different uses, trolleys can be divided into circuit breaker trolleys, voltage transformer trolleys, metering trolleys, isolation trolleys, etc. All kinds of trolleys can change in a modular and building-block manner, and trolleys of the same specification can be freely interchanged.

- **Compartment Division**: The switchgear is divided into four independent compartments according to functional requirements, namely the circuit breaker compartment C, the busbar compartment A, the cable compartment D and the relay and instrument compartment B. Except for the relay and instrument compartment, the other three compartments each have their own independent pressure relief channels.

- **Interlocking Devices**: The switchgear is equipped with safe and reliable interlocking devices, meeting the requirements of the "Five Preventions", that is, preventing misoperation of the circuit breaker, preventing pushing or pulling the trolley with load, preventing closing the earthing switch when it is energized, preventing power transmission when the earthing switch is in the earthed position and preventing unauthorized access to the energized compartments.

### Operation Instructions

- **Power-on Operation**:

1. Move the circuit breaker trolley from the transfer vehicle to the test position inside the cabinet and insert the secondary plug properly.

2. Close all cabinet doors, confirm that the circuit breaker is in the open state, insert the operating handle of the earthing switch and rotate it counterclockwise to open the earthing switch.

3. Withdraw the operating handle of the earthing switch, and the sealing plate at the operating port will pop up to block the operating hole of the earthing switch.

4. First, operate the "On-off Control" switch on the control panel to close the circuit breaker, and test whether all the "Emergency Stop" buttons, the open-circuit switches and the transformer over-temperature tripping functions are normal.

5. Insert the crank handle of the circuit breaker trolley and rotate it clockwise until it reaches the proper position, so that the circuit breaker trolley is in the working position. 6. Operate the "On-off Control" switch on the control panel to perform the closing operation.

- **Power-off and Maintenance Operations**:

1. Operate the "On-off Control" switch on the control panel to open the circuit breaker.

2. Insert the crank handle of the circuit breaker trolley and rotate it counterclockwise to make the circuit breaker trolley retreat to the test position. At this time, the main circuit is disconnected and the shutter is closed.

3. Press down the sealing plate at the operating port of the earthing switch, insert the operating handle of the earthing switch and rotate it clockwise to close the earthing switch.

4. During maintenance, pull out the secondary plug and lock it on the trolley, then move the circuit breaker trolley to the transfer vehicle and lock it.

### Maintenance and Inspection

- **Daily Maintenance**: Regularly check the appearance of the switchgear, including the cabinet body, cabinet doors, instruments, etc., to ensure that there is no damage, deformation or looseness. Check whether the bolts at each connection part are tightened and whether the cable joints are overheating.

- **Periodic Maintenance**: Conduct a comprehensive inspection of the switchgear at regular intervals, including the inspection and maintenance of equipment such as circuit breakers, disconnectors, transformers, etc., lubricating and debugging the operating mechanism, and calibrating the protection devices.

- **Troubleshooting and Maintenance**: When a failure occurs in the switchgear, it should be repaired in a timely manner. During the repair, the cause of the failure should be found out and repaired according to the failure phenomenon and alarm information by using professional detection tools and methods.

### Precautions - Operators must be familiar with the structure, performance and operation methods of the switchgear and operate strictly in accordance with the operating procedures. - During the operation process, pay attention to observing the state of the switchgear. If there is any abnormality, stop the operation immediately and conduct inspection and treatment.

- When maintaining and repairing the switchgear, the power supply must be cut off first, and corresponding safety measures should be taken, such as hanging ground wires and setting up warning signs. - Regularly clean the switchgear to prevent dust and debris from entering the inside of the switchgear and affecting the normal operation of the equipment.