InsuLogix® GIC-GEOMAGNETIC INDUCED CURRENT SENSOR

InsuLogix® GIC serves as a connector between the transformer neutral bushing and ground to measure the value of direct current (quasi DC) in transformer windings created by geomagnetic disturbances.

OPERATION

InsuLogix® GIC direct current sensor and filter detect and eliminate 60 Hz currents flowing through neutral ground circuit. The sensor provides a 4-20 mA output, proportional to the measured value of current.

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Technical Specifications

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INSTALLATION

InsuLogix® GIC can be installed on a variety of transformer tank designs and can be welded to a special support plate which is attached to the tank or attached by screws to the tank structure, as shown in Figure 1. For electrical connection, upper part of a bar should be attached to grounding conductor connected to the neutral bushing. Lower part of the bar should be properly grounded. The dimensions of the grounding wire and the bar should be specified prior order placement to ensure appropriate kind of connectors are provided.

Examples of bare wire standard connectors:

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Conduit pipes and 4-20 mA cables are required to connect InsuLogix® GIC with transformer control cabinet.

MAINTENANCE

InsuLogix® GIC does not require any calibration or configuration and is a maintenance-free product.

OTHER ACCESSORIES

For more advanced detection of geomagnetic induced currents, InsuLogix® GIC can be connected to other monitors and send digital data to control center via Modbus and DNP3 protocols.

OPTIONS

A temperature measurement feature for hot spot detection, reactive power and harmonics meter can also be added as a part of the monitoring system. InsuLogix® GIC is customizable and offers options to meet your specific needs.


Electromagnetic radiation induces an electric current

 The electromagnetic radiation from the Sun, induces an electric current (quasi DC) in the transmission line, which passes through the coils of the transformer.

The electromagnetic radiation from the Sun, induces an electric current (quasi DC) in the transmission line, which passes through the coils of the transformer.

Magnetic flux in a transformer

 The geomagnetic current flowing through the coils of the transformer, saturates the core increasing the leakage flux which heats the metal parts (coils, metal fittings, tank, etc.).

The geomagnetic current flowing through the coils of the transformer, saturates the core increasing the leakage flux which heats the metal parts (coils, metal fittings, tank, etc.).

Core Saturation-Harmonics

 Core saturation produces harmonics due to the increased demand of excitation current. The value of reactive power increases as well, and may lead to a breaker trip.

Core saturation produces harmonics due to the increased demand of excitation current. The value of reactive power increases as well, and may lead to a breaker trip.


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