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Earthing Switch MJN15-40.5

Description

MJN15-40.5-40 — Indoor earthing switch with insulators, designed for operation as part of switchgear cabinets in three-phase alternating current networks with a frequency of 50 Hz, rated voltage 35 kV, with an insulated or earthed neutral arcing reactor or resistor, designed for visible separation section of the electrical circuit during the audit or repair of equipment.

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.

Rated voltage, kV: 35

Maximum working voltage, kV: 40.5

Interfacial distance, mm: 275, 300

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.

MJN15-40.5 is used for the safe grounding of electrical equipment during repairs and maintenance.

Advantages of MJN15-40.5:

1. Security

The speed of the instantaneous mechanism is independent of the operator.

2. Installation flexibility

The moving parts of the earthing switch are supplied assembled, and the response stationary parts are ready for installation. A manual drive or an electric motor drive may be used.

3. Compact

Compact design with minimal footprint

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Parameters

Operating Conditions of MJN15-40.5:

Altitude: up to 1000 m.
Ambient temperature: from -25 C to + 40°C.
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%.
Seismic resistance up to 8 points.
Environment is not explosive, does not contain dust, aggressive gases and vapors in concentrations that destroy metal and insulation.
Lifetime – 25-30 years.
Warranty period from the date of commissioning — 2 years.

Parameters of MJN15-40.5:

No.	Unit of Measurement			Data
1	Rated voltage		kV	40.5
2	Rated short-time withstand current		kA	31.5
3	Rated Short Circuit Duration		from	4
4	Rated peak withstand current		kA	80
5	Rated short circuit current		kA	80
6	The distance between the centers of the poles		mm	275, 300
7	Nominal	kV	kV	95
7	Nominal	Rated lightning impulse withstand voltage (peak value)	kV	185

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Solutions

Solutions and Applications of Medium Voltage Earthing Switches:

Substations: In medium voltage substations, earthing switches are used during maintenance or fault conditions to ensure that particular sections are safely grounded.
Switchgear Assemblies: Within switchgear setups, earthing switches are integrated to ground specific sections, making it safe for operators to conduct maintenance or repair tasks.
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.
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.
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.
Transformer Circuits: Before maintenance on transformer circuits, earthing switches provide an essential safety barrier, ensuring the transformer and its associated circuits are safely grounded.
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.
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.

Dimensions of MJN15-40.5-40kA

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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Earthing Switch MJN15-40.5