KYN28 switchgear

KYN28A-24(Z) armored removable AC metal-enclosed switchgear

**I. Definition and Characteristics**

1. **Definition**

- The KYN28A switchgear is an indoor metal-armored withdrawable switchgear with a rated voltage generally of 10kV, 12kV, 24kV, etc. It is mainly used in substations, power plants, industrial and mining enterprises and other places in the power system to realize the control, protection and monitoring of power lines.

2. **Characteristics**

- **Metal-armored structure**:

The cabinet body adopts a metal-armored structure with high mechanical strength and protection level. It can effectively resist external mechanical impacts and collisions and protect the safety of internal equipment.

- **Withdrawable design**:

Main electrical components such as circuit breakers are installed on withdrawable trolleys, which is convenient for maintenance and replacement. When maintenance is needed for the equipment, the trolley can be pulled out from the cabinet for maintenance without affecting the operation of other equipment, improving the availability and maintenance efficiency of the equipment.

- **Perfect interlocking device**:

Equipped with perfect mechanical and electrical interlocking devices to ensure the safety of operation. For example, when the circuit breaker is in the closed state, the trolley cannot move from the working position; only when the grounding switch is in the open state can the trolley enter the working position, etc.

- **High degree of intelligence**:

An intelligent monitoring system can be configured to realize real-time monitoring and remote control of the equipment's operating status. Through sensors, various operating parameters of the equipment, such as voltage, current, temperature, etc., are collected and transmitted to the monitoring system for analysis and processing, so as to timely discover abnormal conditions of the equipment and take corresponding measures.

**II. Structural Composition**

1. **Cabinet body**

- The cabinet body is composed of a metal frame and metal partitions and is divided into multiple compartments such as a busbar compartment, a circuit breaker compartment, a cable compartment, and an instrument compartment. Each compartment is independent of each other and is isolated by metal partitions to ensure the safety of the equipment.

- The shell of the cabinet body is made of high-quality steel plates and has undergone rust prevention and anti-corrosion treatment, with good durability. The surface of the cabinet body adopts electrostatic spraying technology, which is beautiful and elegant in appearance and also improves the corrosion resistance of the equipment.

2. **Electrical components**

- **Circuit breaker**:

It is one of the core components of the switchgear and is used to connect and disconnect circuits. The KYN28A switchgear usually adopts vacuum circuit breakers or SF6 circuit breakers, which have the characteristics of strong breaking capacity, long service life, and convenient maintenance.

- **Disconnector**: Used to isolate the equipment from the power supply during maintenance to ensure the safety of operators. The disconnector has an obvious disconnection point, which can intuitively judge whether the equipment is in a power-off state.

- **Transformer**:

Including current transformers and voltage transformers, it is used to transform high voltage and large current into low voltage and small current for use by measurement and protection devices. The accuracy and reliability of transformers directly affect the measurement and protection performance of the equipment.

- **Grounding switch**:

Ground the equipment during maintenance to release possible residual charges on the equipment and ensure the safety of operators. The operation of the grounding switch has an interlocking relationship with equipment such as disconnectors and circuit breakers to prevent misoperation.

- **Protection device**:

Including multiple protection functions such as overcurrent protection, quick-break protection, and grounding protection, it is used to cut off the faulty circuit in time when the equipment fails to protect the safety of the equipment and personnel. The performance and reliability of the protection device are directly related to the safe operation of the equipment.

**III. Application Fields**

1. **Power system**:

Widely used in substations, power plants and other places in the power system as control and protection equipment for power lines. In the power system, the KYN28A switchgear can reliably realize the connection, disconnection and protection of power lines to ensure the safe and stable operation of the power system.

2. **Industrial and mining enterprises**:

It can be used in the power distribution system of industrial and mining enterprises to provide stable power guarantee for production equipment. In industrial and mining enterprises, there are higher requirements for the reliability and safety of power equipment. The KYN28A switchgear can meet these requirements and provide reliable power support for enterprise production.

3. **High-rise buildings**:

In the power distribution room of high-rise buildings, the KYN28A switchgear can be used as power distribution and control equipment to provide power supply for lighting, elevators, air conditioners and other equipment in the building. Due to the high reliability requirements for power supply in high-rise buildings, the high reliability and intelligent characteristics of the KYN28A switchgear make it an ideal choice for the power system of high-rise buildings.

**IV. Installation and Maintenance**

1. **Installation requirements**

- **Installation environment**:

It should be installed in a dry, well-ventilated place without violent vibration and impact. Avoid installing it in an environment with high humidity, corrosive gases or a lot of dust to avoid affecting the performance and service life of the equipment.

- **Foundation requirements**:

A solid foundation is required. Generally, concrete foundation is used. When the cabinet body is installed on the foundation, the levelness and verticality should meet the requirements to ensure the stable operation of the equipment.

- **Wiring requirements**:

The wiring of high-voltage cables should comply with relevant standards and specifications to ensure a firm and reliable connection. At the same time, insulation treatment of cables should be done well to prevent leakage and short-circuit accidents.

2. **Maintenance points**

- **Regular inspection**:

Regularly inspect the switchgear, including appearance inspection, electrical connection inspection, operating mechanism inspection, etc. Discover potential problems of the equipment in time and take corresponding measures for treatment.

- **Circuit breaker maintenance**:

Regularly maintain the circuit breaker, including checking the contact wear of the circuit breaker, the flexibility of the operating mechanism, the state of the arc extinguishing chamber, etc. According to the inspection results, replace worn contacts, repair the operating mechanism or replace the arc extinguishing chamber in time.

- **Transformer calibration**:

Regularly calibrate the transformer to ensure its accuracy and reliability. Professional calibration equipment should be used during calibration and operations should be carried out in accordance with relevant standards and specifications.

- **Cleaning and maintenance**:

Regularly clean the switchgear and remove dust and dirt on the surface of the equipment. Keeping the equipment clean helps improve the heat dissipation performance and insulation performance of the equipment.