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Medium-Voltage distributionMCset1-2-3 17,5 kVMetal-enclosed withdrawable switchgears SF6 - Vacuum technology

Thermal diagnosis

solutionTHEto prevent damage in the event of an abnormal temperature rise

monitoring

alarm

fault location

For your Medium-Voltage substations, the thermal diagnosis function ensures: • improved availability of your facilities, allowing remote data transfer to monitoring systems, • greater continuity of service, • increased safety, • lower maintenance costs.

The thermal diagnosis function can be used to monitor MCset 1-2-3 switchboards and control/monitor the Motorpact motor.

Motorpact: monitoring • D - cable connection • E - upper MV fuse-holders

MCset: monitoring • A - cable connection • B - busbar connec-tion and upper circuit breaker rack-in • C - lower circuit breaker connections (optional)

Temperature rises are generally caused by an event external to the equipment:

• corrosive atmosphere (polluted industrial environment), • deterioration of an electrical contact (maintenance or installation error for example), • poor operating conditions (using a switchboard beyond its operating capacity).

Potential risk of equipment deterioration • equipment degradation, • risk of internal arcing,

extended shutdown of the facility for maintenance or component/cubicle replacement.

Deteriorated contact A rise in temperature causes the contact surface to deteriorate even further.

Temperature rise Increased contact resistance.

Poor contact condition • faulty connection, • insufficient tightness, • damaged contact surfaces,

increased connection resistivity.

Thermal runaway

To avoid any deterioration of the equipment, you must determine the thermal runaway and stop its progression.

Thermal diagnosis: monitoring – alarm – fault location.

It is based on the principle of measuring circuit temperatures at Medium-Voltage (MV) potential, without insulation-related risk (due to the use of optical fibres).

By measuring the temperature of live circuits, it ensures: • continuous monitoring of the temperature rise in power circuits at busbar and cable connections, • tripping of a pre-alarm, followed by an alarm, by activating dry contact outputs (remote operation via the monitoring system), • location of the zone and circuit concerned.

Additional test, control, setting and other tools are pro-vided to ensure the quality of the solution (test kit, etc.). Please contact your usual Schneider Electric representative.

A

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Schneider Electric Industries SASHead Office35 rue Joseph MonierCS 3032392506 Rueil-Malmaisonwww.schneider-electric.com

As standards, specifications and designs change from time to time, please ask for confirmation of the information given in this publication.

This document has been printed on ecological paper.

Publishing: SYNTHESE ECA, Schneider Electric.Printing:

11/2008

Technical data

CF0733 optical fibre probes Maximum equipment voltage 17.5 kVRated power frequency voltage 38 kV 1 minute - 42 kV 1 minute Impulse voltage 95 kV Maximum fibre/sensor temperature 120° C

MDT106 moduleTemperature rise setting to be defined Possibility of setting the ambient temperature correction Maximum absolute thresholds pre-alarm: 115 ° C alarm: 120 ° CMulti9 profile width 10.5 cmModule power supply 24 / 250 V DC, 110 / 240 V ACDry contacts Voltage 24, 48, 127, 220 V DC 110 to 240 V AC Current 5 A continuous (pre-alarm) 8 A continuous (alarm)Consumption (standby-max.) V DC < 1.2 W (standby) ; < 3.4 W (max.) V AC < 4.4 VA (standby) ; < 6.6 VA (max.)

The thermal diagnosis system is based on sensors made from a sensitive material whose fluores-cence time is temperature-dependent. Via a pair of optical fibres, an electronic module controls the transmission of calibrated light pulses and calculates the temperature according to the return pulses received.

The system consists of:

• a "multi9" profile electronic module (MDT106), mounted on a DIN rail • a "multi9" profile electronic module (MDT106), mounted on a DIN rail in the cubicle's LV compartment. in the cubicle's LV compartment. It is used to: - monitor temperature rises in two zones, - trip a pre-alarm, - trip an alarm, - self-monitor the module, - self-monitor the probes.

• two probes (CF0733). • two probes (CF0733). The sensor, optical fibre and connector assembly are known as a "probe". Each of these factory-mounted assemblies consists of three sensor heads, three pairs of optical fibres and the connector for connection to the data read module. The sensor heads are made from a photosensitive material whose fluorescence time is temperature-dependent. Located in zones with a risk of abnormal temperature rise, these probes have been specifically designed to withstand stresses related to the MV environment. Optical technology provides an effective solution for obtaining reliable measurements and a long system service life. The probes used are factory-built assemblies comprising: - three sensors attached to the power circuit, - the optical connections, - a connector linked to the module. This connector includes the opto-electrical conversion unit, thus dispensing with the need for an optical connection during installation.

• fittings for factory installation of probes in the MCset cubicle.

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