Product Introduction
SF6 inflatable ring main unit is a common box type, fully insulated medium voltage SF6 gas insulated ring main unit that the company has introduced and digested foreign advanced technology and independently developed and produced. High technical level, exquisite workmanship, stable performance, safe and reliable operation. It is widely used in industrial and civil ring network power distribution systems and power supply terminals. It is especially suitable for small secondary power distribution stations, opening and closing offices of industrial and mining enterprises, urban residential areas, airports, railways and other places.
Application environment conditions
Ambient temperature: -30℃～+55℃ (the extreme low temperature can reach -40℃)
Relative humidity: daily average ≤95% monthly average ≤90%
Altitude: ≤3000 meters
Seismic intensity: 8 degrees
Performance Features
1. Safe and reliable
SF6 inflatable ring main unit uses SF6 gas as the insulation and arc extinguishing medium and adopts a common box structure. All switch devices and all live parts are completely sealed in a fully insulated box. The box is filled with SF6 gas with a relative pressure of 0.036MPa. The sealing structure adopts advanced magnetic fluid sealing technology and technology to ensure that the annual leakage rate of SF6 gas in the air box is <0.05%.
The cabinet has a compact structure, small size, easy installation, and no exposed live parts, which reliably guarantees the insulation performance of the equipment, maximizes the safety of operation and operation, and can effectively prevent the intrusion of condensation, dirt, small animals, and corrosive chemicals.
2. Maintenance-free
The inflatable box is made of high-quality stainless steel plates with a thickness of 3.0mm, and adopts advanced manufacturing processes and testing methods such as laser welding and ultrasonic testing technology. The product meets the requirements of GB/T11022 and GB3906 standards for "sealed pressure system". The sealing performance of all products has been strictly inspected in the factory. The current advanced helium gas spectrometry leak detection method is used to detect SF6 gas leakage during the production process and subsequent testing of the ring network switchgear gas box. After being put into operation, only the SF6 gas pressure needs to be checked regularly, and the design maintenance-free life is up to 30 years.
3. Flexible and reliable expansion
The inflatable ring network switchgear is designed with expansion connections based on a semi-modular approach, and can provide two fully insulated expansion methods: fully insulated top or side, to meet the needs of different applications. Through reserved interfaces on the top or side of the switch cabinet, flexible expansion of functions can be achieved, making the overall fixation and flexible expansion of the ring network switch cabinet harmonious and unified.
Technical Parameters
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Project
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Parameters
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Load switch cabinet (K)
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Combined electrical cabinet (T)
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Circuit breaker cabinet (W)
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Rated voltage
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12kV
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Rated frequency
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50Hz
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Rated current
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630A
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125A~:
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630A / 1250A
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Rated transfer current
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1750A
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Cable charging breaking current
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40A
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25A
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No-load transformer breaking current
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16A
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16A
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Rated active load switching times
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100 times
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Rated short circuit breaking times
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≥30 times
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Rated short-time withstand current
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Main loop
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20kA / 4s
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20kA/4s, 31. 5kA/4s
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Grounding switch
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20kA / 4s
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20kA/4s, 31. 5kA/4s
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Rated short-circuit closing current
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Main loop
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50kA
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50kA / 80kA
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Grounding switch
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50kA
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50kA / 80kA
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Work-minute power frequency withstand voltage
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Alternate and opposite
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42kA
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Break
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48kA
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(Lightning) strike withstand voltage
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Alternate and opposite
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75kA
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Break
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85kA
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|
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Mechanical life
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Main switch
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～5000 times
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~10000 times
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Grounding switch
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~3000 times
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Main circuit resistance
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≤120μΩ
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≤400pO
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≤%200pQ
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SF6 gas rated pressure (20~C)
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0. 036MPa
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SF6 gas annual leakage rate
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≤0.05%
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Secondary circuit rated power supply voltage
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AC220V / DC48V / DC24V
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Secondary circuit lm.….Power frequency withstand voltage
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2kV
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Protection level
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Inflatable box
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IP67
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Outer shell and operating mechanism
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IP4X
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Note: The rated current and rated short-circuit breaking current of the combined electrical cabinet are determined by the fuses equipped.
Meet standards
GB3804 3.6kV～40.5kV high voltage AC load switch
GB3906 3.6kV～40.5kV AC metal-enclosed switchgear and control equipment
GB/T11022 Common technical requirements for high-voltage switchgear and control equipment standards
GB1984 High voltage AC circuit breaker
GB1985 High voltage AC isolation switch and grounding switch
DL/T404 3.6kV～40.5kV AC metal enclosed switchgear and control equipment
DL/T402 High Voltage AC Circuit Breaker Ordering Technical Conditions
DL /T486 High voltage AC isolating switch and grounding switch
DL /T593 Standard common technical conditions for high-voltage switchgear and control equipment
DL/T728-2000 Technical Guidelines for Ordering Gas Insulated Metal-Enclosed Switchgear
