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Solid-insulated switchgear components

Solid-insulated switchgear components

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Description

 

Solid insulation means “Air” is being replaced with “Solid Insulating Material”. We all know that in any Air Insulated Medium voltage switchgear panel all live components like Bus Bar, CT, PT and Cable terminations are surrounded by Air with required creepage and clearance to sustain power frequency & impulse voltages.

 

Epoxy is being evolved as a very good medium for insulation and Solid Insulation Switchgear Technology is based on excellent insulation property of epoxy. Suppose if all the live components mentioned above are being encapsulated inside epoxy and electrical connections are also insulated once connection is done then there is no need of Air as an insulating material. We can understand the same with below picture:

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Parameters

 

Main Parameters:

ItemsUnitMSIS49-12-L

load break switch unit

MSIS49-12-F

combination electrical unit

MSIS49-12-CB

circuit breaker unit

Rated voltagekV121212
Rated frequencyHz505050
Rated currentA630Depends on current rating of the fuse630
Rated
insulation
level		Rated power-frequency withstand voltage
-between phases, to earth
-across the isolating distance
-control and auxiliary circuit		kV 

42
48
2

 

42
48
2

 

42
48
2

Rated lightning impulse voltage
-between phases, to earth
-across the isolating distance		 

75
85

 

75
85

 

75
85

Rated short-time withstand currentkA20/4s—20/4s
Rated peak withstand currentkA50—50
Rated short-time making currentkA50Limited by high voltage fuse50
Rated short-time breaking currentkA—Limited by high voltage fuse20
Rated transfer currentA—3150—
Rated active load breaking currentA630——
Rated closed loop breaking currentA630—630
MechanicallifeLoad switch / circuit breakertimes100001000010000
Disconnector / earthing switch300030003000
Resistance of main circuitμΩ<120—<120

 

Operating Condition

  1. Altitude: ≤4000m (Please specify the situation when the altitude is higher than 1000m)
  2. Ambient temperature: -40~+50℃; average temperature in 24h ≤35℃.
  3. Ambient humidity: 24-hour Max. Average relative humidity: 95%; monthly Max. Average relative humidity: 90%
  4. Installation condition: no explosive and corrosive gas around; no violent vibration and impact at installation site; pollution level less than GB/T5582 Grade III.
  5. Seismic intensity: 9 degrees.
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Solutions

 

Introductions of Core Components Technology

Master Switch Design

a.The master switch adopts vacuum interrupter
b.Particular curve design for reducing force mechanism

  1. Reduce dosing impact
  2. Reduce extra work
  3. No extra contact pressure added when trigger returns
  4. Diffuse the contact pressure and reduce tripping force when opening

 

Disconnector Design

  1. Disconnectors with three-position design prevent incorrect operations thoroughly in theory design
  2. Contact design benefits earthing making, and the making speed >4.2m/s
  3. High-performance Mubea belleville spring guarantees stability of the contact pressure

Master Switch Mechanism

  1. Motor, auxiliary switch, release, travel switch of the master switch mechanism are removable and easy maintenance
  2. Two-spring precise transmission design has reclosing function
  3. Automatic counting function meets the latest State Grid purchase standard
  4. High quality quenched and tempered steel and chilled steel are used in all transmission components
  5. Needle bearing design of the core transmission has deep impact-resistance, large loading and little frictional drag

Disconnector Mechanism Design

  1. Disconnecting mechanism, with three-position mechanism single spring and two independent operating shafts, thoroughly prevents misoperations according to the theoretical design
  2. Disconnecting operation mechanism can add electric configuration
  3. Dual clutch design makes the manual operation and electric operation switch freely
  4. The output shaft, with the gear acceleration design, has high output efficiency, large power transmission and the earthing making speed>4.2m/s

Inspection Window Design

  1. According to the optical imaging principle adopted in the window, the range of observation can be large although the viewing window is small
  2. The earthing window with build-in light are easy and clear to observe
  3. The illumination with LED guarantees the light life

 

Pressure-Relief Design

Dedicated pressure-relief device

Operating Button Design

  1. Master switch manual operation with button design is easy to operate.
  2. The button cover can prevent misuse and can also add a padlock.The planetary reducing direct-current permanent magnet motor, with small size and stable working condition, has amazing transmission efficiency. The loss of energy efficiency is about 3%.

Second Generation Solid Insulated Core Unit

Surface with greyish white zinc coating, completely earthed and touch-proof design.

 

Please Specify When Ordering

  • Altitude: 1000m / above 1000m
  • Operation mode: manual / electric20kA / 25kA
  • Rated short circuit breaking current: 20kA / 25kA
  • Working position: two / threeDC24V / DC48V / DC110V / DC220V
  • Operating voltage: DC24V / DC48V / DC110V / DC220V
  • Configuration: circuit breaker / load break switch / disconnector
  • Secondary wiring： with / without (normally without)
  • Other requirements

METTZ Group stands as a consortium of Chinese electrical firms, renowned for its expertise in manufacturing electrical equipment. We are specialized in crafting a comprehensive suite of transmission and distribution equipment, covering a wide voltage range from 0.4 to 40.5 kV. Our commitment lies in delivering reliable and stable products to our clientele, encompassing vacuum circuit breakers (VCB), gas-insulated switchgear modular units (RMU), solid insulated switchgear (SIS) panels, air insulated switchgear (AIS) panels, and dry compressed air insulated switchgear panels (DIS).

Since our inception, METTZ Group has been at the forefront of adopting international cutting-edge technologies and equipment. We pride ourselves on our extensive collaboration and dialogue with leading experts in the electrical technology sector, both within China and internationally. Our offerings are tailored to meet the specific needs of our clients, including Original Equipment Manufacturer (OEM) services, customization of products to unique parameters and dimensions, all in alignment with our customers’ specifications.

METTZ Group is dedicated to innovation, quality, and customer satisfaction, ensuring that we remain a preferred partner for electrical equipment solutions worldwide.

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