Dry-insulated switchgear MDIS49-12

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Description

 

The MDIS49-12 represents a breakthrough in switchgear technology, embodying the principles of environmental sustainability and efficiency. This metal-enclosed ring network switchgear is a novel green solution, utilizing dry air or nitrogen — both eco-friendly gases for insulation.

This design significantly reduces or even eliminates greenhouse gas emissions.

With a material recovery rate exceeding 90% at the end of its lifecycle, the MDIS49-12 sets a new standard for environmental responsibility in switchgear design. Unlike traditional models, it minimizes the use of refractory epoxy resin materials for insulation parts, excluding the casing, to truly embrace green environmental practices.

Key Features:

  1. Vacuum Arc Extinguishing: Both the circuit breaker and load switch leverage vacuum arc extinguishing technology, enhancing the switchgear’s environmental adaptability and operational reliability.
  2. Compact Design: Its small footprint contributes to land space conservation, an essential factor in dense urban or environmentally sensitive areas.
  3. SF6-Free: Eliminates the need for SF6 gas detection and protective measures, offering a safer and more sustainable option.
  4. Maintenance-Free: Designed for reliability and ease of use, the MDIS49-12 requires no routine maintenance, ensuring long-term, trouble-free operation.
  5. Intelligent Operation: Integrates smart technology to facilitate efficient and reliable power distribution management.
  6. Versatile Application: Suitable for a 12kV, three-phase AC 50Hz power distribution system, the MDIS49-12 is ideal for a wide range of applications, including urban residential power distribution, small secondary substations, switching stations, cable branch boxes, box-type substations, and infrastructure in industrial sectors, shopping centers, airports, subways, wind farms, hospitals, stadiums, railways, and tunnels.

The MDIS49-12 dry-insulated switchgear heralds a new era in power distribution equipment, combining environmental sustainability with advanced technological features. It represents the future direction of ring main unit development, offering a safe, reliable, and green solution for various electrical distribution needs.

Parameters

 

Service conditions:

  1. Ambient air temperature: -40℃-+50℃
  2. Humidity: Maximum average relative Value, daily<95%, monthly<90%
  3. Altitude: ≤4000 M
  4. Seismic resistance: 8 degrees
  5. Use under special conditions can be negotiated.

 

The main technical parameters of the Environmental Gas Insulated RMU

Rated voltage kV 12
Rated current A 630
Arc extinguishing method Vacuum switch tube
lnsulation method Pure air or nitrogen
Rated short circuit breaking current kV 20
Rated short circuit breaking times Times 30
Rated short-circuit closing current (peak) kV 50
Rated short-time withstand current 3s (rms) kA 20 (Main circuit), 17, 4 (Earthing circuit)
Rated peak withstand current kA 50 (Main circuit), 43, 5 (Earthing circuit)
Power frequency withstand voltage(1min) kV 42 (Phase to earth, phase to phase), 48(breaking)
Lightning impulse withstand voltage kV 75(Phase to earth, phase to phase), 85(breaking)
Partial discharge PC ≤20
Rated sequence of operations of vcbs O-0.3S-CO-180S-CO
Withstands internal arc faults KAS 20/0.5
Mechanical life Times 10000 (VCB)   3000 (Isolating switch, Earthing switch)
Main circuit resistance of each phase μΩ 120
Earthing switch rated short-circuit making current (peak value) KA 43, 5
Earthing switch closing times Times 2
Degree of protection MPa IP67 (Gas box), IP4X(body case)
Rated gas pressure (gauge pressure) MPa 0.02
Minimum operating gas pressure 0/0 0
Rated annual leakage rate ppm 0.01
Moisture content in air box kV ≤150
Auxiliary circuit power frequency withstand voltage (1min) 2

 

Main technical parameter of circuit breaker

 Rated voltage 12
Rated current 630
Rated short-circuit breaking current 20
Rated short-circuit closing current (peak) 50
Rated short-time withstand current 3s (rms) 20
Rated peak withstand current 50
Rated sequence of operations O.-0.3s-C.O.-180s-C.O.
Power frequency withstand voltage(1min) 42 (Phase to earth, phase to phase), 48 (breaking)
Lightning impulse withstand voltage (peak) 75 (Phase to earth, phase to phase), 85 (breaking)
Partial discharge ≤5
Mechanical life 10000
Main loop resistance per phase ≤110
Contact spacing 9±1
Contact pressure over-travel 3±0, 5
Contact final pressure 1800±100N
Three-phase opening (different phases) ≤1
Contact closure bounce time ≤2
Closing time ≤70
Opening time ≤60
Average opening speed 1.1+0.2
Average closing speed 0.8+0.2
Rated number of short-circuit current breaks 30

 

The main technical parameters of the main circuit (disconnector) of the combined grounding switch on the busbar side:

Rated voltage kV 12
Rated current A 630
Rated short-time current 3s (rms) kA 20
Rated peak withstand current kA 50
Power frequency withstand voltage (1min) kV 42 (Phase to earth, phase to phase), 48 (breaking)
Lightning impulse withstand voltage (peak) kV 75(Phase to earth,phase to phase), 85 (breaking)
Three-phase opening (different phases) m m ≤2
Mechanical life Time 3000
Total resistance of each phase main circuit μΩ ≤60
Contact pressure N 160+20
Closing force Nm ≤100
Moving and static contact distance mm ≥125

 

The main technical parameters of the grounding circuit (grounding switch) of the combined grounding switch on the busbar side

Rated voltage kV 12
Rated current A 630
Rated short-time withstand current 2s (rms) kA 17, 4
Rated peak withstand current kA 43.5
Power frequency withstand voltage (1min) kV 42 (Phase to earth, phase to phase), 48 (breaking)
Lightning impulse withstand voltage (peak) kV 75 (Phase to earth, phase to phase), 85 (breaking)
Three-phase opening (different phases) m m ≤1
Mechanical life Times 3000
Total resistance of each phase main circuit μΩ ≤60
Contact pressure N 160+20
Closing force nm ≤100
Rated short-circuit closing current KA 43, 5
closing times Times 2
Moving and static contact distance mm ≥125

 

Main technical parameters of spring energy storage operating mechanism

 Auxiliary circuit rated voltage V DC48、DC110, AC220,DC220
Auxiliary circuit power frequency withstand voltage (1min) kV 2
Opening and closing coil voltage V DC48、DC110, AC220、DC220
Opening coil current A 2
Closing coil current A 2
Rated voltage energy storage time S ≤20
Auxiliary switch rated voltage V DC48、DC110, AC220、DC220
Auxiliary switch rated current A 10
Pairs of the auxiliary switch contact 😯 8C

 

Dry-insulated switchgear MDIS49-12-1

Solutions

 

MDIS49-12 environmental gas insulated Ring Main Unit is a complete set of power distribution device of 12kV, three-phase AC 50Hz, single bus and single bus segment system. The product has the characteristics of simple structure, flexible operation, reliable interlocking, and convenient installation and so on, and different users can provide satisfactory technical solutions for different applications.

The adoption of sensing technology, automatic control technology and information technology, coupled with advanced technical performance and simple and flexible assembly scheme, can meet the changing needs of the market, and apply to the intelligent requirements of the power grid.

MDIS49-12 is suitable for industrial and civil cable ring network and distribution network terminal engineering. As the acceptance and distribution of electric energy, it is especially suitable for urban residential area power distribution, small secondary substation, opening and closing office, cable branch box, box type substation, industrial and mining enterprises, shopping malls, airports, subways, wind power generation, hospitals, stadiums, railways, tunnels and other places.

Dry-insulated switchgear MDIS49-12-2 Dry-insulated switchgear MDIS49-12-3

Main features of the MDIS49-12 switchgear:

Functional compound, integrated products

Our MDIS49-12 switchgear features an inflatable shell meticulously crafted from high-grade 2.5mm thick stainless steel, precisely welded using advanced laser technology. This design choice guarantees the air box’s integrity, ensuring exceptional mechanical strength, superior corrosion resistance, and a robust protection rating of IP67. This dedication to quality not only secures the system’s reliability but also its longevity in challenging conditions.

The main circuit adopts a combination of three-station switch (on-+ isolation + grounding) and vacuum interrupter, which is a mature configuration mode and suitable for the current power grid operation and maintenance needs.

Environmental protection, pollution-free

The insulating medium of MDIS49-12 environmental protection gas enclosed ring network switchgear is zero-level dry air (purchased) or 99.99% pure N2 in accordance with GB/T 8979-2008 and the leakage of gas will not have any impact on the external environment, and there is no need for any recovery treatment.

Flexible expansive design 

MDIS49-12 is a modular design, which can connect various modules through special bus connectors. Realize a variety of unit combinations to meet the complex and diverse power distribution design schemes in various parts of China to the greatest extent.

Perfect mechanical interlock

The operation panel of MDIS49-12 environmental protection gas closed ring network switchgear has a perfect five-proof mechanical interlocking function, all the interlocking functions are configured internally, please operate in the order of operation instructions when operating, and it is very convenient to use.

METTZ Group is an expert in the production of high-quality electrical equipment, specializing in the manufacturing of a complete set of transmission and distribution equipment within the 10-40.5kV range. The company is dedicated to providing reliable and stable products to its customers, including VCB, RMU, GIS, AIS, DIS and LBS.

METTZ Group continuously introduces international advanced workmanship and equipment since its foundation, and widely cooperates and communicates with experts at home and abroad in technology. The company can supply custom OEM services such as Logo, custom size, or custom merchandise, etc., according to customer requirements.

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