Description
Summary
KUGN-12 series gas insulated metal enclosed switchgear (C-GIS) is a new generation of gas insulated switchgear C-GIS products developed by our company.
Metal armored gas seal, internal use of low pressure SF6 gas as insulation medium, high-voltage parts waterproof, dustproof not affected by the environment, not affected by altitude, completely free of maintenance, using permanent magnet or spring operating mechanism, solid sealing pole vacuum interrupter, greatly reducing parts and components.
Reliable operation in basement, plateau, frozen soil, coastal and other high altitude, humid, salt fog harsh environment, to meet the new energy, plateau, subway, high-speed rail and land shortage of urban power distribution projects, with high reliability. maintenance free, strong adaptability,less land occupation characteristics.
With intelligent control and protection unit, it has powerful control, protection, measurement and communication functions and fully realizes the requirements of distribution network automation.
The product is a complete set of indoor three-phase Ac single bus, double bus and bus section. t is mainly used in power plants small and medium-sized power stations, substations, high-rise buildings, industrial and mining enterprises, subway and electrified railway, etc, to control, receive, distribute, protect and monitor the power supply system and electric energy.
Execution Standard
GB1984-2014 AC high voltage circuit breaker
GB3906-20063.6kV~40.5kV AC metal enclosed switchgear and controlgear
GB/T11022-2011 Common technical requirements for high voltage switchgear and control equipment standards
GB1985-2014 High voltage AC disconnectors and earthing switches
GB/T11023-1989 Test method for SF6 gas seal of high voltage switchgear
GB4208-2008 Enclosure protection level (IP code)
DL/T402-2007 Technical conditions for ordering high voltage AC circuit breakers
DL/T486-2010 Technical conditions for ordering high voltage AC disconnectors and earthing switches
DL/T403-200012kV~40.5kV Technical conditions for ordering high voltage vacuum circuit breakers
DL/T404-20073.6kV~40.5kV AC metal enclosed switchgear and controlgear
DL/T593-2006 Common technical requirements for high voltage switchgear and control equipment standards
DL/T791-2001 Guide for selection of indoor AC inflatable switchgear
Service Environmental Conditions
Altitude: < 5000m (when the altitude of the equipment is higher than 1000m, it needs to be specified specially);
Ambient temperature: maximum temperature + 50 °c , minimum temperature – 25 “c . The average value within 24 hours is lessthan 35 °C :
Environmental humidity: 24h average relative humidity < 95%; monthly average relative humidity < 90%;
Installation environment: there is no explosive and corrosive gas in the surrounding air, and there is no frequent severe vibration or impact in the installation site:
Please contact the technical department of our company if it exceeds the normal use conditions specified in GB3906 or IEC62271-200 and the manual.
Product Technical Features
Compact structure
KUGN-12 indoor inflatable switchgear has more compact structure, which can greatly save limited urban land
Maintenance free
The primary components are all sealed in the sealed gas box welded with stainless steel plate, filled with 0.04MPa sF6 gas as the insulation medium, with the protection grade of iP67, which can completely avoid the influence of external environment and climate on the switch cabinet, and reliably operate in the basement, plateau, frozen soil, coastal, humid and other harsh environment,realizing maintenance free.
Safety and reliability
The switch cabinet has reliable five prevention mechanical interlocking, which can prevent misoperation. All high voltage components, including cable terminals, arresters, current transformers and voltage transformers, are sealed with grounded metal enclosure, safe and touchable.
Simple installation and operation
The product is designed according to the modular structure, the scheme combination is flexible, and the operation is simple and convenient, The side connection between cabinets is made by side parallel bus connector, which is convenient for installation.The voltage transformer and lightning arrester are installed outside the gas box to facilitate installation and replacement.
Product Technical Parameters
| NO. | Project | Unit | Parameter | |
| 1 | Rated voltage | kV | 12 | |
| 2 | Rated frequency | Hz | 50 | |
| 3 | Rated current | A | 630/1250/2000/2500 | |
| 4 | Rated insulation level | Power frequency withstand voltage(phase to phase ,to ground,vacuum fracture) | kV | 42 |
| Power frequency withstand voltage (isolated fracture) | 48 | |||
| Powerfrequencywithstandvoltage (control and auxiliary circuit) | 2 | |||
| Lightningimpulse withstand voltage (phase to phase, to ground, vacuum fracture) | 75 | |||
| Lightningimpulse withstand voltage (isolated fracture) | 85 | |||
| 5 | Rated short timewithstand current/duration | Main circuit | kA/s | 31.5/4 |
| Earthing switch | 31.5/4 | |||
| Grounding circuit | 27.4/4 | |||
| 6 | Rated peak withstand current | Main circuit | kA | 80 |
| Earthing switch | 80 | |||
| Grounding circuit | 69.6 | |||
| 7 | Rated short circuit breaking current | kA | 31.5 | |
| 8 | Short circuit breaking times | times | 30 | |
| 9 | Rated short circuit making current | kA | 80 | |
| 10 | Rated breaking current of single capacitor bank | A | 630 | |
| 11 | Rated back to back capacitor bank breaking current | A | 400 | |
| 12 | Rated cable charging breaking current | A | 25 | |
| 13 | Rated operation sequence | O-0.3s-CO-3min-CO | ||
| 14 | Mechanical life | Circuit breaker | times | 10000 |
| Three position switch (disconnector/earthing switch) | 3000 | |||
| 15 | Rated pressure ofSF6 gas (relative value of20°C) | Rated inflation pressure | MPa | 0.04 |
| Minimum functional level pressure | 0.02 | |||
| 16 | Protection level | Sealed box | IP67 | |
| Switchgear enclosure | IP4X | |||
| 17 | Annual relative leakage rate of SF6 gas | % | ≤0.01 | |
| 18 | Rated supply voltage of auxiliary circuit | V | AC380,AC220 | |
| 19 | Rated supply voltage of control circuit | V | DC110,DC220,AC220 | |
| 20 | External dimension ofcabinet | Wide | mm | 600/800 |
| Deep | 1250 | |||
| High | 2300 | |||
Product Structure
The vacuum circuit breaker is located in an inflatable compartment, the bus and the three position switch are in another inflatable compartment. The inflatable compartment is made of non-magnetic stainless steel plate by laser cutting and welding, and the non welded sealing connection surface is sealed with O-shaped rubber ring.
The gas filled compartment of the circuit breaker is equipped with a cable connecting sleeve, which can be connected with multiple cables in parallel, voltage transformer or lightning arrester ,etc. the annular core current transformer is installed on the cable and fixed with the switchgear frame.
The product is of three-phase common box type and air box integrated design structure, which is composed of integrated inflation compartment, low-voltage chamber (instrument room, operating mechanism room), cable compartment, etc.
A pressure relief device is set on the upper part of the inflatable compartment. When the internal pressure of the inflatable compartment exceeds a certain limit value, the pressure relief device will automatically open to release gas, so as to ensure the safety of operators and products.
The bus connection between cabinets is realized by connecting the top expansion bus connector.
Introduction Of Main Parts And Accessories
Three position switch vacuum circuit breaker integrated machine
Manual and motor driven direct acting three position switch, horizontal layout, with: work,isolation and grounding functions
The three position switch has mechanical and electrical interlock to prevent all kinds of misoperation
The electric field of cylindrical electrode is uniform
It has the function of mechanical position indication
The vacuum circuit breaker is horizontally arranged in the gas box, and the vacuum arc extinguishing technology is adopted. The interruption does not affect the SF6 insulation strength
The spring operating mechanism is located outside the air box and has automatic reclosing function, which can be disassembled as a whole and is convenient for maintenance
Making fixed pole of vacuum circuit breaker by APG Technology
Cooperate with three position switch to realize anti short circuit grounding function
Introduction of main accessories
Top expansion bus connection system
Shielded front plug
Technical features:
Fully insulated, fully shielded, not affected by harsh environment, pollution proof, maintenance free.
Technical Parameters
| Project | Parameter | ||
| Cable | 8.7/15kV | 12/20kV | 18/30kV |
| System voltage | 10kV | 24kV | 36kV |
| Rated current | 630/1250A | 630/1250A | 630/1250A |
| Power frequency withstand voltage(5mins) | 39kV | 54kV | 81kV |
| Partial discharge | ≤10pc（15kV） | ≤10pc（21kV） | ≤10pc（31kV） |
Back plug arrester
Technical features
Special structure, integral molding, no air gap, good sealing performance,moisture-proof and explosion-proof, long creepage distance, good water increasing ability and strong pollution resistance.
Technical Parameter
| Model | AHY5WZ-17/45 | AHY5WZ-26/66 |
| System nominal voltage | 10kV（r.m.s） | 20kV（r.m.s） |
| Rated voltage | 17kV | 26kV |
| Continuous operating voltage | 13.6kV | 20.8kV |
| Residual voltage under 5kA lightning impulse current | 45kV | 66kV |
| Voltage UlmA under DC lmA | ≥25kV | ≥37kV |
| 0.75ulma DC leakage current | ≤50μA | ≤50μA |
| 2ms square wave shock capacity | 150A | 150A |
| Power frequency withstand voltage of load insulation jacket | 39kV | 54kV |
Voltage transformer
Technical features:
Epoxy casting dry voltage transformer, plug-in design, fully enclosed combined type.It is connected with the primary system through the cable plug and socket, and the product has its own fuse.
Current transformer
Technical features:
Cable core type current transformer with ring core structure. Its ring core and secondary winding are vacuum cast in flame retardant stainless steel shell with high quality epoxy resin, which is maintenance free, it is installed outside the gas box and is not affected by primary high voltage.
Intelligent microcomputer measurement and control protection device
The intelligent microcomputer monitoring and protection device integrates the functions of protection, control, measurement, monitoring, communication and alarm, which can realize the comprehensive automation requirements and realize unattended.
Operating procedures
Power transmission operation
Operate the circuit breaker to open → operate the three position switch from the grounding position to the isolation position → operate the three position switch from the isolated position to the closing position → operate the circuit breaker to close
Blackout operation
operate the circuit breaker to open → operate the three position switch from the closing position to the isolation position→operate the three position switch from the isolation position to the grounding position→detect that the circuit at the cable side is in the state of power loss switch on the circuit breaker
Interlock Function
(a)Prevent the circuit breaker from closing again;
(b)Only when the three position switch is in any working position of closing, isolating or grounding, can the circuit breaker be closed or opened;
(c)When the handle of the three position switch is not taken out, or the switch is not in place in the process of connection,isolation or grounding of the three position switch, the circuit breaker cannot be closed;
(d)When the grounding knife is in the grounding position and the high-voltage cable room is charged, the manual and electric locking circuit breaker is closed to prevent the incoming line from being charged to lock the grounding switch;
(e)When the circuit breaker has no operating power supply, both manual and electric locking circuit breaker are closed;namely, the circuit breaker is closed under voltage loss; if the secondary control circuit has no working power supply and the circuit breaker needs to be closed and opened on site, the circuit breaker panel shall be disassembled first, and the locking electromagnet connecting rod shall be manually pulled up to realize the closing and opening of the circuit breaker manually.
(f)If there is no special instruction for ordering, the circuit breaker has been equipped with electrical anti tripping function.
Outline Dimensions And Foundation Reference Drawings
Typical Primary Circuit Scheme
