Overview
FZRN21-40.5 indoor high-voltage vacuum load switch and combination electrical equipment, suitable for three-phase AC 40.5kV, 50HZ power systems, or used in conjunction with distribution equipment and ring network switchgear, combined AC power stations, etc., widely used in wind power generation Chengwang construction and renovation projects, industrial and mining enterprises, high-rise buildings, and public facilities can serve as power supply units or terminal equipment for the ring network, playing a role in the distribution, control, and protection of electrical energy. The technical performance of this product complies with the requirements of GB16926-1997 "AC High Voltage Load Switch Fuse Combination Apparatus" and IEC420 "AC High Voltage Load Switch Fuse Combination Apparatus".
This product has the advantages of high breaking capacity, safety and reliability, long electrical life, frequent operation, compact structure, small size, light weight, and basically no maintenance required. The switch has the ability to disconnect rated current, overload current, short-circuit current, and prevent equipment from running in phase loss. The switch has a visible isolation fracture, equipped with a grounding switch and electric spring mechanism with closing ability, and has remote control capability.

2. Model and meaning of FZRN21-40.5 indoor high-voltage vacuum load switch
2.1 High voltage vacuum load switch


2.2 High voltage vacuum load switch fuse combination



3. Usage conditions
Normal usage conditions
3.1 The ambient air temperature shall not exceed 40 ℃, and the average temperature measured within 24 hours shall not exceed 35 ℃, with a minimum ambient air temperature of -25 ℃;
3.2 The impact of sunlight radiation can be ignored;
3.3 The altitude shall not exceed 1000m;
3.4 The surrounding air is not significantly polluted by dust, smoke, decay, corrosive and/or flammable gases, steam or salt spray;
The daily average relative humidity for planting should not exceed 95%; The daily average water vapor pressure shall not exceed 22kPa; The monthly humidity does not exceed 90% of the average value; The average monthly water vapor pressure shall not exceed 1.8KPa;
3.6 Vibration or ground motion from outside the switchgear and control equipment can be ignored;
The amplitude of electromagnetic interference induced in the secondary system shall not exceed 1.6kV.

4. Technical parameters of FZRN21-40.5 indoor high-voltage vacuum load switch
4.1 Main technical parameters of composite electrical appliances

4.2 Technical parameters of vacuum load switch assembly and adjustment in combination electrical appliances



4.3 Technical parameters after assembly and adjustment of isolation switches equipped with composite electrical appliances



4.4 Technical parameters after assembly and adjustment of grounding switch for combination electrical appliances



4.5 Technical parameters of fuses for combination electrical appliances

5. Structure and working principle
5.1 Structural Features
The combination electrical device is a three pole linkage structure: mainly composed of a frame, a vacuum arc extinguishing chamber, an isolation switch (equipped with fuses), a grounding switch, and a spring operating mechanism. The isolation switch, vacuum arc extinguishing device, and grounding switch are fixed to the frame through insulators, and the spring operating mechanism is installed on the side plate of the frame.
5.2 Working principle
5.2.1 Operation of vacuum arc extinguishing chamber
The operation mode of the vacuum arc extinguishing chamber of the composite electrical appliance adopts an electric spring operating mechanism for closing, a release electromagnet for opening, and can also be used for manual closing. Opening operation: When manually closing, use the operating handle to rotate the energy transmission shaft of the spring operated mechanism clockwise.
5.2.2 Opening and closing operations of isolating switches and grounding switches
A reliable mechanical interlocking device is installed between the vacuum arc extinguishing chamber, isolation switch, and grounding switch of the composite electrical appliance, and the isolation switch and grounding switch are operated by the same axis. When the isolation switch is closed, the vacuum load switch is finally closed. The opening sequence is the opposite, only when the vacuum load switch is in the opening state, can the isolation switch and grounding switch be operated.
5.2.3 Fuse impact tripping and opening
When a combination electrical device is in the closed position and a short-circuit current or overload current flows through the main circuit, at least one phase of the fuse melts.
The action of the impactor and the opening speed depend on the magnitude of the current. The larger the current, the faster the opening speed, causing the mechanical release device of the combination electrical appliance to operate. In this way, the vacuum arc extinguishing chamber can achieve reliable and fast opening under the action of the opening spring.

6. Appearance and installation dimensions of composite electrical appliances

External appearance and installation dimensions of load switch



Appearance and installation dimensions of composite electrical appliances



7. Acceptance and installation
7.1 Delivery Conditions
The assembled composite electrical appliances in the factory must undergo integrity inspection before leaving the factory, and strict factory tests must be carried out in accordance with the national standard GB 16926 and the technical conditions of the product to ensure the correctness of the structure and function of each composite electrical appliance leaving the factory.
7.2 Acceptance
After receiving this switchgear, the recipient should perform the following tasks:
a) Check whether there is a shortage of goods according to the packing list;
b) Check whether the goods are intact and undamaged, and whether they have been damaged (such as by moisture or other adverse effects);
c) If serious damage is found to the goods, the supplier should be notified in a timely manner and a record should be made (taking photos if necessary)
7.3 Installation
Combination electrical appliances should be installed on walls or in metal cabinets where the opening and closing status of the isolation knife can be observed. Connect 6 M16 bolts through the mounting holes on the frame to the fixed frame, and the installation of the manual operating mechanism is detailed in Figure 2. The isolation knife and arc extinguishing chamber should be in the open state during installation.
Accurate and professional installation is a fundamental and important condition for ensuring the fault free operation of composite electrical appliances. When installing composite electrical appliances, the following points should be noted:
a) It is necessary to ensure that the size design of the cabinet and the combination of electrical appliances is accurate and that all technical parameters are consistent;
b) The combination appliance is fixedly installed inside the switchgear, ensuring that it is not subjected to tension, compression, or deformation. Its four mounting bolts should be firmly connected and not loose;
c) When connecting the busbar, it should not be subjected to permanent tension or pressure. And ensure that the bolts connecting the busbar are firm and not loose.
8. Maintenance and upkeep
The maintenance of composite electrical appliances must be carried out by professionals who are familiar with various safety operating procedures and understand product performance. Record inspections and repairs. During maintenance work, ensure that there is no risk of electric shock.
The combination electrical appliances produced by our company have the characteristics of simple structure and durability, therefore they have a long service life. Under normal usage conditions, there is little maintenance work during the service life. However, due to differences in usage environments and their impact on the service life of composite electrical appliances, the following necessary inspections and maintenance work still need to be carried out.
a) According to the work environment, appropriate inspections should be carried out on the combination electrical appliance body within 6-12 months, especially checking its appearance. At the same time, it is necessary to check the surface of the equipment for dirt, moisture, and corrosion. Clean the dust on the surface of the insulation with a dry cloth, and then wipe off other impurities with a silk cloth dipped in cleaning agent (note that the cleaning agent used can be applied to plastic or synthetic plastic materials);
b) If the combination appliance is used in situations where it is not operated for a long time, the rotating friction part of the combination appliance should be slid every year;
c) Insulation tests should be conducted at least once a year on composite electrical appliances to determine if the vacuum arc extinguishing chamber is leaking or if there is a decrease in insulation strength due to other external factors.
9. Packaging, transportation, and storage
9.1 When packaging composite electrical appliances, they should be in the open state. Fixed on the bottom plate of the packaging box, with rainproof measures and complete packaging markings.
9.2 Combination electrical appliances must not be inverted or subjected to strong vibrations during transportation, and must not be exposed to moisture or rain. The outer surface of the product must not be damaged, and components must not be lost.
9.3 Combination electrical appliances can only be loaded and unloaded using the following tools: cranes, forklifts, or cranes. When lifting, the hook should not be attached to the body of the composite electrical appliance, but should be attached to the lifting hole marked with the lifting mark on the composite electrical appliance.
9.4 Combination electrical appliances should be stored in an open state for a long time and placed indoors in a dry, ventilated, moisture-proof, vibration proof, and harmful gas resistant place. Regular inspections should be conducted to ensure that the environment meets the requirements.

10. Random files and spare parts
10.1 Product Qualification Certificate;
10.2 Factory inspection report;
10.3 User Manual
10.4 Institution manual and wiring diagram;
10.5 Packing list;
10.6 Accessories and spare parts.