1.1 YK(F)3-12D (C) (I、Ⅱ) series Load switches are used in a networkwith a rated voltage of 10KVand three-phase AC 50HZ, for opening and closing circuits and grounding in the presence of voltage but no load.

1.2 Environmental conditions for use:

An altitude not exceeding 1000 meters;

e ambient temperature should not exceed+40 ℃ and should not be lower than -30 ℃

e relative temperature shall not exceed 90% (± 25 ℃);

A place without re, explosion, corrosive metal, toxic gases that damage Insulation, and abnormal electrical dust;

1.Model and meaning

2.Main technical parameters

3.Product peormance

The YK(F)3-12 series Load switch, due to its special structure, not only has its own isolation switch power supply function, but also has two side anti misoperation functions:

Prevent hanging grounding wires when live;

Prevent closing with grounding wire.

The load switch is a three Pole common chassis type, consisting of a base, a shaft, a pillar, an isolation contact blade, a  grounding contact blade, a contact and a linkage mechanism, etc., and adopts a three-phase parallel conguration; e assembly  form corresponding to the same polarity, the rotation axis action of the main contact blade and the grounding contact blade is  operated by a linkage mechanism through a crank (adjustable at any angle, assembled by the user) and a CS6-1 mechanism, so that the switch has the following three working positions:

a) Isolation contact switch on, grounding contact switch o (with a break distance greater than 125mm) 

b) Close the isolation contact knife (with a break distance greater than 150mm) and disconnect the grounding contact knife (with a break distance greater than 125mm); (i.e. middle position)

c) Close the isolation contact knife (with a fracture opening distance greater than 160mm), and close the grounding contact knife.

The installation and application of Load switch comply with JB618-85 and other relevant requirements;

6.1 Preparation before installation

a. After opening the box, check whether the spare pas and technical components of the new product are complete according to the packing list, and inspect whether the new product has been damaged during transpoation and storage:

b. Clean the suace di of the new product, carefully wipe the suace of the Insulator and the grounding pa on the low frame;

c. Apply industrial Vaseline to the conductive pas and lubricate the transmission pas with lubricating ngers.

6.2 Installation Position Requirements

a. is switch can be installed on walls, ceilings, or metal frames, and can be installed veically, horizontally, or diagonally;

b. e installation height of isolation switches is generally 12.5m-6m; e installation position of the hand-operated mechanism is 1-1.3 meters.

c. e installation of isolation switches should ensure that the insulation distance between the live pas of the switch and the ground, regardless of the opening or closing position, is not less than 125mm.

6.3 Installation method and adjustment requirements (see Figure 1, Figure 2, Figure 3, Figure 7)

4.Installation and debugging

6.3.7 Wiring terminals, size of grounding exible wire terminals (see Figure 4, Figure 5, Figure 6)

5.External dimensions of Load switch

Main parameters of high-voltage isolation switch

Main Parameters of High Voltage Isolating Switches

High voltage isolating switches are essential components in electrical systems, ensuring safe disconnection and isolation of circuits for maintenance and repair. Understanding their key parameters is crucial for selecting the right switch for specific applications. Below are the primary parameters that define the performance and functionality of high voltage isolating switches.

1. Voltage Rating

The voltage rating is one of the most critical parameters of a high voltage isolating switch. It indicates the maximum voltage that the switch can safely handle without risk of electrical breakdown or arcing. This rating is usually expressed in kilovolts (kV). It is essential to choose a switch with a voltage rating that matches or exceeds the system’s operating voltage to ensure safety and reliability.

2. Current Rating

The current rating refers to the maximum current that the isolating switch can handle when it is in the closed position. This rating ensures that the switch will not overheat or experience damage during normal operation. The current rating is typically specified in amperes (A), and it should match the expected current flowing through the circuit during regular operation.

3. Breaking Capacity

Breaking capacity is the maximum short-circuit current the isolating switch can interrupt without causing damage to the switch or the surrounding system. This parameter is essential to prevent catastrophic failures during fault conditions. The breaking capacity is usually specified in kiloamperes (kA) and is determined based on the system's fault levels.

4. Mechanical Endurance

Mechanical endurance refers to the number of times the isolating switch can be operated (opened and closed) without failure due to wear or mechanical damage. This is an important consideration for switches used in systems where frequent switching is required. The mechanical endurance is typically specified in operations (e.g., 10,000 or 20,000 operations).

5. Electrical Endurance

Electrical endurance refers to the number of times the isolating switch can open and close under normal load or fault conditions without degradation in performance. This parameter is different from mechanical endurance and focuses on the switch’s ability to handle electrical stress over time. Electrical endurance is measured in operations and can be influenced by factors such as voltage and current ratings.

6. Insulation Resistance

Insulation resistance is a measure of the ability of the isolating switch to resist the flow of electrical current through its insulating components. High insulation resistance is essential to prevent leakage currents that can pose a safety hazard. It is typically measured in megohms (MΩ), and a higher resistance value indicates better insulating performance.

7. Contact Resistance

Contact resistance refers to the resistance at the point of contact when the switch is closed. Low contact resistance ensures minimal energy loss and prevents excessive heating of the contacts. This parameter is critical for maintaining the long-term efficiency of the isolating switch and is typically measured in milliohms (mΩ).

8. Switching Speed

Switching speed is the rate at which the isolating switch can open or close. Faster switching speeds are beneficial in preventing damage to the system during fault conditions, but the speed must be balanced with mechanical and electrical endurance to avoid excessive wear. Switching speed is typically specified in milliseconds.

9. Operating Temperature Range

The operating temperature range specifies the minimum and maximum temperatures at which the isolating switch can function reliably. It ensures that the switch can operate in diverse environmental conditions without compromising safety or performance. High voltage isolating switches are generally designed to operate in temperatures ranging from -40°C to 60°C, depending on the specific model.

10. Arc Extinguishing Capability

Arc extinguishing capability refers to the isolating switch’s ability to safely quench an electrical arc that occurs when the switch is operated under load or fault conditions. Switches with good arc extinguishing properties help prevent damage to the switch and surrounding equipment. The design of the switch, including its contacts and mechanisms, directly influences its arc quenching ability.

11. Installation and Mounting Type

The installation and mounting type of the isolating switch refer to how the switch is physically installed in the electrical system. Common types include indoor and outdoor mounting, wall-mounted, or on a switchgear panel. The mounting type influences the switch's accessibility, protection, and maintenance needs.

12. Degree of Protection (IP Rating)

The degree of protection, specified by the International Protection (IP) rating, defines the switch's resistance to environmental factors such as dust, moisture, and other external elements. A higher IP rating, such as IP55 or IP65, indicates better protection and suitability for harsh outdoor conditions.

Conclusion

When selecting a high voltage isolating switch, it is essential to consider these key parameters to ensure it meets the needs of the electrical system. Factors such as voltage rating, current rating, breaking capacity, and insulation resistance play a significant role in the switch’s reliability and performance. By understanding these parameters, you can make an informed decision when choosing the right isolating switch for your application, ensuring safety, efficiency, and long-term durability.