Disconnector MGNF38-12

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Description

 

Model MGNF38-12 is indoor three-pole disconnector for power distribution equipment, designed to enable and disable de-energized sections of the electrical circuit with a rated voltage of 10 kV and an alternating current frequency of 50 Hz.

D-indicates the presence of an earthing switch.

 

Rated voltage, kV: 10

Maximum working voltage, kV: 12

Rated current, A: 400, 630, 1000, 1250

 

Operating conditions of MGNF38-12:

  1. Altitude: up to 1000 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

 

Main Parameters of MGNF38-12:

Model Specifications GN38-12/630 GN38-12/1250 GN38-12/1600
GN38-12D/630 GN38-12D/1250 GN30-12D/1600
Rated voltage (kV) 12
Rated current (A) 630 1250 1600
4s short-time withstand current (kA) 20 31.5 80
Rated peak withstand current (kA) 20 31.5 80
Rated insulation level Lightning impulse voltage (kV) Phase-to-phase, relative to ground 75, fracture 85
1min power frequency withstand voltage (kV) Phase, relative to 42, fracture 48

Standards:

GB1985-1989AC high-voltage disconnectors and earthing switches

IEC129-84AC disconnectors and earthing switches

 

The outgoing line adopts the through-wall MGNF38 type, which directly forms an insulating partition in the busbar room and the circuit breaker room. Its incoming terminal is easy to be directly connected with the horizontal busbar of the parallel cabinet, which can reduce the height of the switch cabinet, reduce the transition joint and reduce the cost.

The operating mechanism drives the isolating switch shaft to rotate, and drives the operating arm to push and pull the isolating blade, so that it opens and closes with the incoming line contact, or with the grounding contact to achieve isolation or grounding.

Solutions

 

The primary function of a disconnector is to serve as a visual indicator of whether an electrical connection is open or closed; this lets network operators know if the circuit/equipment is either energised or de-energised.

It is important operators can confirm the energised state of the circuit/equipment in order that they can safely perform inspections, maintenance, and repairs, without unnecessary risk.

 

Overall dimensions of MGNF38-12:

Disconnector MGNF38-12-2

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