Product Introduction
XGN-12 series solid fully insulated closed ring-network switchgear is a fully insulated, fully sealed, maintenance-free solid insulated vacuum switchgear. High-voltage live parts are cast and molded with epoxy resin material with excellent insulation performance. The vacuum arc extinguishing chamber, main electrical circuit, insulation support, etc. are organically combined as a whole. The functional units are connected through fully insulated solid busbar. Therefore, the whole switchgear is not affected by the external environment, which can ensure the reliability of equipment operation and the safety of operators.
The ring-network cabinet has the characteristics of simple structure, flexible operation, reliable interlocking and convenient installation. It is applicable to 50Hz, 12kV power systems, and is widely used in industrial and civil cable ring-network and distribution network terminal projects, as well as for the acceptance and distribution of electric energy. It is especially suitable for distribution in urban residential areas, small substations, switching stations, cable branch boxes, box-type substations, industrial and mining enterprises, shopping malls, airports, subways, wind power generation It is used in hospitals, stadiums, railways, tunnels and other places.
Due to the advantages of full insulation, full sealing and full shielding, this product is especially suitable for use in areas with high altitude, high temperature, humid heat, severe cold, serious pollution and other harsh environments.
Product classification
According to the type of switch, it can be divided into load switch with grounding assembly (referred to as C module), load switch without grounding assembly (referred to as CB module), circuit breaker with grounding assembly (referred to as V module), circuit breaker without grounding assembly (referred to as VB module), circuit breaker contact switch (referred to as VZ module), load switch+fuse combination switch assembly (referred to as F module), Disconnector assembly (G module for short).
Working conditions
◇ Ambient temperature: - 45 ℃~+45 ℃
◇ Humidity: upper average relative humidity, daily average ≤ 95%, monthly average ≤ 90%
◇ Altitude: ≤ 4000m
◇ Seismic resistance: 8 degrees
◇ Protection grade: charged body seal IP67, fuse cartridge lP67, switch cabinet shell IP3X
Functions and features
environment protection
The materials used in the product manufacturing are all non-toxic and harmless substances, and no toxic and harmful substances will be discharged during the use. The materials can be recycled after the life cycle, which determines the environmental protection of the use.
Fully insulated, fully sealed, fully shielded epoxy resin switch shell, Fuse body (Epoxy resin has excellent electrical properties, mechanical properties and thermal properties, and has been used in electrical equipment for a long time, and has achieved good performance. Switch and fuse casings are formed by epoxy resin APG process. Insulating casings are the key components of solid insulated switches, which are both insulating and load-bearing parts. It is required to meet the technical requirements of heat resistance, weather resistance, crack resistance, high mechanical strength, and good insulation strength. The simple body is large Large, many inserts and different shapes make it difficult to manufacture. Our company has many years of experience in designing and manufacturing insulating parts. From the barrel design, material formula and process flow, we have made great efforts to ensure the excellent batch production of this part. According to the user's requirements, the outer shield grounding can be provided to touch the cylinder)
Maintenance-free:
In addition to the operating mechanism, the high-voltage switch part of the solid insulated indoor AC high-voltage vacuum switch cabinet is in a fully sealed state, which can avoid cleaning and maintenance and reduce the cost of operation and maintenance.
Security:
As the touchable parts are shielded, the occurrence of personal electric shock accidents is eliminated and the safety of use is improved. Perfect interlocking interlocking system, three-phase isolation fracture is clearly visible, avoiding the occurrence of misoperation accidents. The application of SF6 gas is canceled, and the explosion accident caused by the reduction of insulation performance and arc extinguishing capacity of SF6 ring-network cabinet due to insufficient gas pressure is avoided. Strengthen the interphase isolation structure to avoid the expansion or explosion accident caused by interphase or multi-circuit short circuit. The vacuum arc extinguishing chamber with explosion-proof performance is adopted, and the switch sleeve has further protective performance for the switch. The auxiliary grounding switch of the load switch-fuse combination appliance is sealed in the fuse barrel with vacuum switch tube.
Ease of operation:
There is only one operating handle for the disconnector grounding switch, so there is no need to identify and worry about mistakes. When the circuit breaker is running, the operating handle of the disconnector grounding switch cannot be operated. The operating procedure is clear at a glance. As long as the personnel with a little electrician knowledge can operate, they will conduct complex technical training in disorder. This makes the operation extremely simple and prevents operation errors.
Intelligence:
The switch cabinet is reserved with intelligent interface and sensor installation position, which can meet the requirements of smart grid after configuring intelligent equipment.
Multiple operating mechanisms:
The switch can be equipped with two operating mechanisms, spring and permanent magnet, which are convenient for users to choose.
Compliance with standards
◇ Q/GDW 730-2012 Technical Conditions for 12kV Solid Insulated Ring Main Unit
◇ GB1984 AC High Voltage Circuit Breaker
◇ GB3804 3.6kV-40kV AC High Voltage Load Switch
◇ GB1958 AC High Voltage Disconnectors and Earthing Switches
◇ GB4208 IP Code of Enclosure Protection Class
◇ GB 16926 high-voltage AC load switch-fuse combination
◇ GB/T15166.2 High-voltage AC fuse sets Part 2: Current-limiting fuse circuits
◇ GB/T7354 Partial Discharge Measurement
◇ GB/T11022 Common Technical Conditions for High Voltage Switchgear and Control Equipment Standards
◇ GB3906 3.6-40.5KV AC metal-enclosed switchgear and control equipment
application area
◆ Low temperature and cold area: no SF6 gas application, no need to consider the low temperature operation of SF6 gas, and it can operate normally at - 45 ℃.
◆ Plateau area: it is unnecessary to consider the influence of plateau atmospheric pressure on insulation performance.
◆ Strong sandstorm area: the safety protection grade of solid insulated ring-network cabinet body is IP67, and the control circuit room adopts special treatment to ensure long-term operation in strong sandstorm area.
◆ Tidal wet pool area along the sea: epoxy resin sealing, moisture resistance, salt fog corrosion resistance, ensure long-term use in coastal areas.
◆ Areas with high environmental protection requirements: the impact of SF6 gas on atmospheric warming has been highly valued, and SF6 gas has been removed from the solid ring network cabinet, without any pollution and injury to the environment and people.
◆ In smart grid: because the main switch and disconnector can be electrically operated, the intelligent controller developed by our company can be selected to carry out remote control, remote measurement and remote communication on the switchgear and substation site,
It can not only conduct decentralized control, but also facilitate centralized control.
Structural characteristics of solid insulation ring-network cabinet core
Vacuum arc extinguishing chamber
Vacuum circuit breaker has the ability to break short circuit current and is used for overload and short circuit protection of circuit and electrical equipment. Because of its small contact opening distance, short arcing time, slight burn when the contact breaks the fault current, small operating energy required, fast action and other characteristics, it also has the advantages of small size, light weight, small maintenance workload, fire prevention, explosion prevention, and low operating noise. It is an ideal circuit breaker to replace oil circuit breaker and SF6 circuit breaker, and is widely used in high-frequency heating and other distribution systems in power, metallurgy, communications and other industries. Vacuum interrupter for circuit breaker is the key component of vacuum circuit breaker and the heart of vacuum circuit breaker. It basically determines the main performance of circuit breaker.
Solid insulation system
The solid sealing pole formed by APG process encapsulates the current-carrying conductors such as vacuum interrupter and upper and lower outlet sockets into a whole. The disconnector is installed in the cavity of the solid-sealed pole, making the interphase insulation mainly solid insulation. Single-phase insulation bus design can avoid serious faults such as interphase and ground. The bus can be expanded to realize unlimited expansion of functional units.
Three-position switch
The switch cabinet is equipped with three-position knife switch. The three-position switch and the main switch are built in the fixed pole. Three-phase linkage can be operated to realize three positions of working/isolation/grounding. The mechanical interlocking with the main switch is adopted. The three-position switch can only operate when the main switch is in the opening position. In addition, the three-position mechanism can also realize interlocking with the grounding position. When the switch is in the working position, the grounding side hole is locked; When the knife switch is in the grounding position, the working side hole is locked.
Operating mechanism
The operating mechanism of the circuit breaker is a spring operating mechanism, which has the characteristics of simple structure, reliable action, compact size, and maintenance-free. The closing power can be adjusted up and down according to the user's requirements. The mechanism can also be used for manual energy storage, manual closing, and manual opening, as well as electric energy storage and electric opening and closing to facilitate user operation.
Three-position knife switch operating mechanism adopts the design of passing spring, which can quickly open and close, and has the function of breaking and closing a certain load current. In addition to manual operation, the three-position mechanism can also carry out electric operation, which can realize intelligent remote control isolation and grounding, greatly facilitating the use of users.
Structural characteristics of solid insulation ring-network cabinet
Solid insulated ring-network cabinet is a small GIS switchgear with the following structure:
A. The high-voltage load switch and high-voltage live parts are sealed in the epoxy plastic insulation sleeve shell without any gas. The vacuum arc extinguishing chamber is small and reliable. The load switch is equipped with a grounding switch, which has three positions of closing, opening and grounding. The grounding switch also has the function of disconnector.
B. It can accommodate 1-5 load switch units or 1-5 circuit breaker units. Each unit is led out through three high-voltage bushings, and the cable connection is convenient.
C. The made sealing box is adopted, and strict sealing measures are taken at the connection of the operating mechanism and the high-voltage bushing, with good performance.
D. High voltage bushing and high voltage insulation cylinder made of epoxy resin by APG process are used. The insulation cylinder and high voltage bushing are tightly assembled by silicone rubber sleeve, which has good sealing effect.
E. Each circuit is equipped with independent operating mechanism, which is installed on the front of the cabinet and has multiple mechanical interlocking functions.
F. The load switch and grounding switch are equipped with spring operating mechanism. The load switch can be operated manually or electrically. The grounding switch not only plays the role of grounding, but also plays the role of isolation. It can only be operated manually.
G. The circuit breaker is equipped with a permanent magnetic operating mechanism, which can be opened and closed electrically and manually, but not manually. The circuit breaker can also be equipped with spring mechanism, which can be manual or electric
Power distribution automation interface is reserved.
H. There is a visual window on the panel of the ring-network cabinet, which can directly observe the opening and closing status of the disconnector fracture.
I. Each ring-network cabinet unit is composed of three separate insulation cylinders in parallel, which is convenient to install and easy to replace. The advantage is to avoid inter-phase discharge.
Characteristics of solid insulation fully enclosed ring-network cabinet
A. The main components of solid insulated fully enclosed ring-network cabinet are composed of insulating cylinder and vacuum arc extinguishing chamber.
B. The solid insulation material is epoxy plastic resin, with a thickness of not less than 10mm. It has strong corrosion resistance and high insulation capacity. The internal space is more than 150mm. The phases are separated separately and connected together through the base plate mounting frame. The combination is flexible, simple, reasonable and beautiful.
C. There are no fasteners on the surface of the box for disassembly, and the anti-theft property is good. The box has IP33 protection grade and good rain-proof performance.
D. The top cover is equipped with a vent, the air inlet is at the lower part of the box, and there is a dust-proof filter screen. The air outlet is located at the top of the box, and is hidden under the eaves to form a bottom-up air convection, so that the box has a good heat insulation and ventilation effect. The top cover is equipped with a drainage angle of a certain angle.
E. The box has a sealed floor with cable inlet to prevent moisture in the cable trench from entering the box.
F. The door is sealed with sealing strip, and the door lock is rain-proof structure. When the door is opened, the limit pull rod makes the door easy to fix.
G. The switch in the box is of solid insulation fully sealed structure, without heater. The cable head can be divided into touchable and non-touchable types according to user requirements, and is not afraid of immersion.
Operating mechanism and operation
A. Each load switch and grounding switch in the ring network unit is equipped with mutually independent spring operating mechanism, which is installed on the front panel of the cabinet and can be operated manually or electrically. Each circuit on the panel has two operation holes to operate the load switch and grounding switch respectively. The vacuum circuit breaker is equipped with integrated permanent magnetic operating mechanism and spring operating mechanism.
B. Operating instructions of load switch
Power transmission operation
Close the isolating grounding switch first: insert the operating handle into the grounding operation hole (when the disconnector is in the grounding closing state), rotate it counterclockwise to open the grounding, and then insert the operating handle into the isolating operation hole, rotate it counterclockwise to close the disconnector.
Re-closing the load switch: insert the operating handle into the operating hole of the main switch, turn it counterclockwise for about 2 turns, and the main switch will be closed.
Power failure operation
A. Switch off the load first: turn the opening knob counterclockwise to open the switch.
B. Re-divide the isolating and grounding switch: insert the operating handle into the operating hole of the isolating mechanism, rotate clockwise, separate the isolating knife, insert the operating handle into the grounding operating hole, rotate clockwise, and close the grounding.
C. Circuit breaker operating instructions
D. Mechanical interlocking: there is mechanical interlocking between load switch, circuit breaker and grounding switch. When the load switch and circuit breaker are closed, the grounding switch cannot be opened or closed; The grounding switch is in the closed state, and the load switch and circuit breaker cannot be opened or closed.
E. Installation and replacement of fuse
(1) Close the grounding switch first.
(2) Lift up the operating handle and rotate it counterclockwise to make the pin out of the slot.
(3) Install the striker mechanism into the fuse barrel, make the pin in the slot, rotate clockwise, make the operating handle parallel to the panel, and then press the handle with force.
(4) It can only be opened when the load switch is grounded.
Transportation and storage
◆ The packaged ring-network unit can be transported by electric forklift or crane. The ring-network unit is equipped with lifting rings for lifting during transportation. The rope used for hoisting shall not be shorter than 2m.
◆ The ring-network unit shall be placed in a dry, ventilated and dust-free place before installation at the use site. If covered with plastic bags, the bottom should be open and ventilated.
Use and maintenance
A. Inspection before use: before using the ring network unit, the following inspections must be carried out for personal and equipment safety
◆ Check whether the main circuit and grounding circuit are connected correctly.
◆ Check whether the mechanical interlocking is correct and reliable.
◆ Check whether the operation of load switch and grounding switch in the ring network unit is flexible and correct.
◆ Check whether the high-voltage cable is connected correctly and reliably.
B. Operation
◆ Put the ring network unit into operation according to the specified operation sequence.
C. Maintenance: This equipment is based on the following advantages, and does not need routine maintenance
◆ The live parts are installed in the epoxy plastic insulation cylinder.
◆ The operating mechanism components placed outside the epoxy plastic insulation cylinder have been electroplated.
◆ The main shaft is supported by copper shaft sleeve, which can work continuously and effectively without lubricant.
Note: If the loop-network unit is faulty, do not attempt to open the loop-network unit for repair with drilling machine, cutting machine or other tools. These operations can only be undertaken by the company's personnel.
Attached documents and attachments
When the product leaves the factory, the following data and accessories shall be provided:
◆ Product installation and operation instructions
◆ Product delivery test report
◆ Product qualification certificate
◆ Packing list
◆ Operating handle
◆ Other accessories
