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MEK6-12-Earthing-Switch

Earthing Switch MEK6-12

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Description

 

MEK6-12 earthing switch of the indoor unit is designed to operate as a part of switchgear cabinets in three-phase alternating current networks with a frequency of 50 Hz, rated voltage 10, 20, 35 kV, with an insulated or grounded neutral arcing reactor or resistor.

The earthing switch is equipped with a spring drive, which ensures the movement of grounding knives at a speed independent of the speed of the operator switching.

For visual inspection, the earthing switch is equipped with a position indicator, and the earthing switch drive system is equipped with a contact block for using the corresponding signals in the secondary signaling and control circuits. The drive system provides the necessary locks for using the ground electrode in the switchgear.

 

Rated voltage, kV: 10, 20, 35

Maximum working voltage, kV: 12, 24, 40.5

Rated current, A: 630, 1250

It serves for the safe grounding of electrical equipment during repairs and maintenance.

 

Advantages of MEK6 earthing switch

1. Security

The speed of the instantaneous mechanism is independent of the operator. Ability to turn on short circuit current.

2. Installation flexibility

The moving parts of the earthing switch are supplied assembled, and the mating fixed parts are ready for installation. The pole distance can vary to install an earthing switch in the switchgear or separately. A manual drive or a motor drive may be used.

3. Compact

Compact design with minimal footprint

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Parameters

 

Operating conditions of MEK6-12, 24, 40.5

  1. Altitude: up to 2000 m.
  2. Ambient temperature: from -15°C to + 40°C.
  3. Humidity: the average value of relative humidity during the day is not more than 95%; the average value of relative humidity during the month is not more than 90%.
  4. Seismic resistance up to 8 points.
  5. Environment is not explosive, does not contain dust, aggressive gases and vapors in concentrations that destroy metal and insulation.
  6. Lifetime — 20-25 years.
  7. Warranty period from the date of commissioning — 2 years.

Parameters of MEK6-12, 24, 40.5

kV 10 15 20 35 35
Rated
voltage
The greatest kV 12 17,5 24 36 40,5
working
voltage
Inrush current peak kA 120 100 63 80 80

 

Earthing switches ЗРВ-6(EK6) Greatest working voltage Lightning impulse test voltage Thermal current Short Circuit time Inrush current peak Size Height Depth Mass
Width
Type U U, 1, th I
max		 Р a c g f
кV кV кА s кА mm mm mm mm mm mm mm kg
MEK6-1208-Z-150 12 75 31,5 3 80 150 424 300 247 48 225 255 11
MEK6-1208-P-150 12 75 31,5 3 80 150 424 300 195 100 225 255 11
MEK6-1208-210 12 75 31,5 3 80 210 544 420 247 58 225 255 12
MEK6-1208-275 12 75 31,5 3 80 275 674 550 195 100 225 250 13
MEK6-1208-150 12 75 31,5 3 80 150 424 300 160 75 225 262 13
MEK6-1208-210 12 75 31,5 3 80 210 544 420 175 50 225 262 14
MEK6-1208-275 12 75 31,5 3 80 275 674 550 210 50 225 262 16
MEK6-1212-210 12 75 40 3 120 210 544 420 175 60 225 262 31
MEK6-1212-275 12 75 50 1 120 275 674 550 210 50 225 262 31
MEK6-1706-150 17,5 95 31,5 3 80 150 424 300 160 75 225 262 13
MEK6-1706-210 17,5 95 31,5 3 80 210 544 420 217 58 225 321 14
MEK6-1706-210 17,5 95 31,5 3 80 210 544 420 175 60 225 262 14
MEK6-1706-275 17,5 95 31,5 3 80 275 674 550 210 50 225 262 16
MEK6-1710-210 17,5 95 40 3 100 210 544 420 145 60 253 265 31
MEK6-1710-275 17,5 95 40 3 100 275 674 550 180 50 253 265 31
MEK6-1710-275 17,5 95 40 3 100 275 674 550 250 50 253 265 31
MEK6-2406-210 24 125 25 3 63 210 544 420 47 258 225 321 12
MEK6-2406-Z-210 24 125 25 3 63 210 544 420 258 47 225 321 12
MEK6-2406-P-210 24 125 25 3 63 210 544 420 190 115 225 321 12
MEK6-2406-275 24 125 25 3 63 275 674 550 120 55 225 321 14
MEK6-2406-210 24 125 25 3 63 210 544 420 175 50 225 321 14
MEK6-2406-275 24 125 25 3 63 275 674 550 210 50 225 321 16
MEK6-2406-210 24 125 25 3 63 210 544 420 175 50 225 321 14
MEK6-2406-275 24 125 25 3 63 275 674 550 210 50 225 321 16
MEK6-3608-280 36 170 31,5 3 80 280 684 (560) 77 315 410 481 50
MEK6-4008-280 40,5 200 31,5 3 80 280 684 (560) 77 315 410 481 55
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Solutions

 

Solutions and Applications of Medium Voltage Earthing Switches:

  1. Substations: In medium voltage substations, earthing switches are used during maintenance or fault conditions to ensure that particular sections are safely grounded.
  2. Switchgear Assemblies: Within switchgear setups, earthing switches are integrated to ground specific sections, making it safe for operators to conduct maintenance or repair tasks.
  3. Capacitor Banks: When capacitor banks need servicing, earthing switches ensure that these high energy storage units are safely grounded, protecting service personnel from potential electrical hazards.
  4. Motor Control Centers (MCC): In MCCs, earthing switches play a role in grounding motor circuits during maintenance, ensuring safety from unexpected startups or residual energy.
  5. Overhead Line Sections: For medium voltage overhead lines, earthing switches are used during maintenance operations to ground line sections, safeguarding against accidental back-feed or induced voltages.
  6. Transformer Circuits: Before maintenance on transformer circuits, earthing switches provide an essential safety barrier, ensuring the transformer and its associated circuits are safely grounded.
  7. Wind Farms: In wind turbine applications, earthing switches are often used to safely isolate and ground the internal electrical systems during maintenance or fault conditions.
  8. Rail Systems: In electrified rail networks, earthing switches play a pivotal role in grounding sections of the catenary system during maintenance or fault scenarios, ensuring the safety of workers and equipment.

 

Overall dimensions of MEK6-12, 24, 40.5

MEK6-12-2

MEK6-12-3

E-Fixed Ground Contact

Earthing L-plate

S-angle

C-on position

O-Off Position

 

Medium voltage earthing switches, though often overlooked, are fundamental in ensuring safety and system integrity in a myriad of electrical applications. Their role in grounding, paired with their integration into interlocking systems, makes them indispensable components in modern electrical infrastructure. As we move towards a future with an ever-growing emphasis on electrical safety, the significance of earthing switches in medium voltage applications remains paramount.

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