NEUTRAL GROUNDING TRANSFORMERS
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For Neutral Grounding and Custom Applications
Since 1983, Acutran Transformers has been design and manufacturing neutral grounding in either individual transformer components or in a complete neutral grounding system.
What is a Neutral Grounding Transformer (aka Earthing Transformer)?
A neutral grounding transformer (NGT) or earthing transformer is a single phase transformer used with a neutral grounding resistor to provide high resistance grounding by connect between the Wye Connection of a power generator and the ground.
For continuous time ratings, the Neutral Grounding transformer must be designed to withstanding the rated current for an indefinite period of time; therefore, the KVA rating of the grounding transformer is equal to the rated line-to-neutral voltage times the desired neutral current. For a short-time rating, the KVA rating of a grounding transformer will be smaller because the unit is designed to carry its rated current for a limited time.
A standard application is normally designed to limit the line-to-ground fault current to below 15 amps for generators rated up to 14,400 volts. Acutran NGTs will provide a high resistance neutral during a fault condition, while allowing the system to operate as an ungrounded system during normal operating conditions.
Acutran can design a custom neutral grounding system for your particular needs if a standard unit is not sufficient. Typically all NGT systems share a common enclosure with separation between he NGT and resistor.
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For Neutral Grounding and Custom Applications
Since 1983, Acutran Transformers has been design and manufacturing neutral grounding in either individual transformer components or in a complete neutral grounding system.
What is a Neutral Grounding Transformer (aka Earthing Transformer)?
A neutral grounding transformer (NGT) or earthing transformer is a single phase transformer used with a neutral grounding resistor to provide high resistance grounding by connect between the Wye Connection of a power generator and the ground.
For continuous time ratings, the Neutral Grounding transformer must be designed to withstanding the rated current for an indefinite period of time; therefore, the KVA rating of the grounding transformer is equal to the rated line-to-neutral voltage times the desired neutral current. For a short-time rating, the KVA rating of a grounding transformer will be smaller because the unit is designed to carry its rated current for a limited time.
A standard application is normally designed to limit the line-to-ground fault current to below 15 amps for generators rated up to 14,400 volts. Acutran NGTs will provide a high resistance neutral during a fault condition, while allowing the system to operate as an ungrounded system during normal operating conditions.
Acutran can design a custom neutral grounding system for your particular needs if a standard unit is not sufficient. Typically all NGT systems share a common enclosure with separation between he NGT and resistor.
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Neutral Grounding Transformer Parameters
Category Description Primary Voltage 480V, 600V, 2400V, 4160V, 12470V, 13800V or Custom Secondary Voltage 120V, 40V, Custom Frequency 60 Hertz Conductors Copper Insulation System Class 150, 180, 200, or 220° C Varnish Vacuum Pressure Impregnation (VPI) Standards IEEE C62.92.6, IEEE C57 .32 Options Custom Enclosures, Neutral Grounding Resistors, Current Transformers, Disconnect Switches, Heater Strips, Thermostats, Ground Fault Relays, Digital Controllers, Special Terminal Connection, Cable Entry/Exit Points, Specific Dimensions & Sizing
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Neutral Grounding Transformer Parameters
Category Description Primary Voltage 480V, 600V, 2400V, 4160V, 12470V, 13800V or Custom Secondary Voltage 120V, 40V, Custom Frequency 60 Hertz Conductors Copper Insulation System Class 150, 180, 200, or 220° C Varnish Vacuum Pressure Impregnation (VPI) Standards IEEE C62.92.6, IEEE C57 .32 Options Custom Enclosures, Neutral Grounding Resistors, Current Transformers, Disconnect Switches, Heater Strips, Thermostats, Ground Fault Relays, Digital Controllers, Special Terminal Connection, Cable Entry/Exit Points, Specific Dimensions & Sizing