OIL LEVEL GAUGES FOR DISTRIBUTION TRANSFORMERS

Transcription

1 (Model Year 2014)

2 OIL LEVEL GAUGES FOR DISTRIBUTION TRANSFORMERS MAGNETIC OIL LEVEL GAUGES (without contacts) Page Type IML 80 and IML 99. They are the two cheapest gauges of our range, with aluminium body, suggested to be used in distribution transformers (max conservator diameter 400mm). An arrow gives the indication of the oil level inside the conservator; they cannot be fitted with electric switches and they can be supplied only in the "R" execution (float movement parallel to the dial). SIDE WALL OIL LEVEL GAUGES Page 5.34 (drg B 3190). Prismatic type. They give an optic indication of the oil level inside a transformer tank or inside a conservator. The steel frame must be bolted to the wall of an hermetic transformer or to the end of a conservator of a conventional transformer. File : ACCESSORI DISTRIBUZIONE.doc UNCONTROLLED COPY REV 05 dtd 22/03/11

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5 AIR DEHYDRATING BREATHERS for distribution transformers Type TV75-6 and VE05-VE10 1. GENERAL INFORMATION Air dehydrating breathers are transparent hollow cylinder tubes which contain chemically pure silicium salt (silicagel) with coloured indicator. The air breathed inside the transformer due to the thermal contraction of the oil mass, passes through the silicagel. The silicagel absorbs the humidity, indicating the saturation degree by changing colour as follows: ORANGE silicagel completely dry. WHITE silicagel saturated with humidity. The salt contained in the breather, when saturated, may be easily removed and regenerated by heating it, inside a ventilated oven, at C, until the colour becomes orange again. The specific property of the silicagel is its high absorption power of humidity. This is total until the salt has absorbed water for about 15% of its weight, and saturation is reached when the salt has absorbed water for 30 to 40 % of its weight. 2. TECHNICAL FEATURES The upper and lower parts are made in a non-porous corrosion-proof aluminium alloy casting. The hollow cylinder is made of plexiglass and it is protected by a stainless steel cylinder, with windows which allow the visual control of the silicagel colour. In the bottom side of the breather, an hydraulic valve prevents continuous air contact with the silicagel and allows the air to pass in both direction (inlet or outlet) only when there is pressure deficiency or excess inside the transformer. Pressure values for air passage into the dehumidifier are: kg/cm 2 inlet, or kg/cm 2 outlet. The hollow container and the hydraulic valve are separated by a drilled plate with a labyrinth system, which have the double purpose of diffusing inlet air uniformly, and of avoiding that any salt dust may damage the closing system. 3. AIR DEHYDRATING BREATHER TYPE TV75 & VE05 & VE10 (Drg.3535) They are small sized dehydrating breathers, particularly fit for assembling on small distribution transformers The type VE05 follows the same manufacturing principles of the bigger sizes like the type VE10. The type TV75 (or TV74) is the cheapest model of our breathers: its top flange is made in corrosion proof aluminium alloy. The silicagel housing is made of cellulose triacetate (cellidor by Bayer), suitable for mineral oil; only upon request, this breather can be fitted with a stainless steel cylindrical protection. File : ACCESSORI DISTRIBUZIONE.doc UNCONTROLLED COPY REV 05 dtd 22/03/11

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8 THERMOMETERS For distribution transformers Page 5.15 : Thermometer MTVT 84 Oil temperature indicator, new concept, fitted with two independent microswirches, range C, only with bottom entry rigid bulb. Page 5.16 : Thermometers type BM (drg 1292) Bimetallic oil temperature indicator, without contacts, range C, with radial rigid stem or back entry, stainless steel housing. Page 5.17 & 5.19 : Thermometers type TESS Oil temperature indicators, standard quality, for small distribution transformers, with two low speed contacts (low rating), stainless steel housing, range C -(page drg 1290) with radial rigid stem, suitable for cover mounting -(page drg 1365) Thermometer type TESS-B-100 with back entry stem and with two contacts (for side wall mounting on transformers without conservator with nitrogen cushion) -(page drg 1365) Vacuum-Pressure Gauge VPG-100 with two contacts (for side wall mounting on transformers without conservator with nitrogen cushion) Page 5.19.A & 5.20.A: Thermometers type TECED High performance oil temperature indicators, organic liquid filled, for distribution transformers of bigger size or for small power transformers, with low speed contacts (low rating), aluminium housing, range C TECED-R with radial rigid stem (pag A) TECED-Y with armoured flexible capillary (pag A) HOUSING: Light aluminium alloy casting with glass window locked by a bronze ring PROTECTION DEGREE: IP 55 OUTDOOR MOUNTING: Allowed BREATHING DEVICE AND DRAIN SCREW: Supplied upon request, are necessary for the use of our thermometer in tropical climate zones, in order to avoid moisturing inside the casing STANDARD RANGE: C PRECISION CLASS: +/- 1,5 MAX POINTER: Supplied upon request CAPILLARY (only for form Y pag. 5.20A). Hermetically sealed capillary tube; bottom entry Armouring: Copper tube or zinckplated flexible sheath inside a plastic tube OIL IMMERSED BULB AND CONNECTOR: On pages 5.19.A and 5.20.A are shown the most commonly used styles, but it is possible to supply tailor made executions, according to customer's specifications. ELECTRIC CONTACTS: Two independent max contacts normally open (other wiring diagrams available upon request), air insulated, slow speed action (these contacts must always work through a relay, never directly on the circuit breaker) CONTACTS CHARACTERISTICS: Insulation test at 2000 V/ 50 Hz Rated voltage [V] Rated current [ma] dc ac / R load ac / ind. load SPECIAL CONTACTS: Contacts may be fitted with two small magnets, with the scope of avoiding sparks between them, due to the increased closing speed; consequently the current rating increases slightly, at a loss of precision of the temperature indication near to the contact set point, and the contact opening The t has a small increase. ORDERING INSTRUCTIONS: TECED type R or Y, nominal dial diameter, bulb style and connection, capillary entry - length - armouring ( only for form-y ), special requirements such as max pointer, breather, ground terminal, special wiring diagrams, special range or other. File : ACCESSORI DISTRIBUZIONE.doc UNCONTROLLED COPY REV 05 dtd 22/03/11

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