VP 150 QT (series 2013)

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1 PRESSURE RELIEF DEVICE VP 150 QT (series 2013)

2 Features The pressure relief valve VP150QT have been specially designed for use on transformers in which is not admitted any external pollution due to oil released during its operation (i.e. transformers installed on trains or ships). The pressure relief valve VP150QT open when the pressure inside the tank increases over the set operating value, following for example a failure or a short circuit. By releasing oil it reduces the pressure in the tank and by means of the electric contact, and the optical indication the pressure relief valve indicates that a fault has taken place. The flanged oil-tight cover retains the oil released by the valve when opening and allow the oil flow out only through a draining duct. A draining screw allows to remove the oil inside the flanged cover before removal during maintenance operations Construction features Materials and components Flange, shutter and cover are made of cast aluminium; Fittings are made of stainless steel or nickel coated brass; Gasket materials are as specified for the different executions (ref to paragraph 6); Springs are made of spring steel, sandblasted and painted with epoxy powders; External screws are made of stainless steel. Reference drawings Assembly, overall dimensions and wiring diagram: drawing 1373 Cross section: drawing 1372 Construction The pressure relief valve type VP150QT is a spring operated safety valve, consisting of a mounting flange with the central opening closed by a spring loaded shutter; the springs are compressed between shutter and pressure ring, which is i assembled to the flange by columns. No part of the pressure relief valve protrudes inside the transformer tank. A specially designed gasket assures the oil-tightness between flange and shutter when the valve is closed. The oil-tight cover encases the valve completely and provides the flanged connection on which a pipe can be fixed. Springs The springs are of the compression type, designed so as to have a limited force gain with the stroke. Operation indication The pressure relief valve VP150QT has an optical indication that the valve has operated; this optical indication consists of a red pin showing about mm over the top of the valve cover when the valve has operated because of an internal overpressure. The pin is spring loaded so that even in case of partial openings of the valve due to small or short-duration overpressures the pin is nevertheless expelled completely. The operation of the pressure relief valve is also indicated by one or two electric contact, which have the characteristics indicated in paragraph 5. Oil-tightness and resistance to pressure The pressure relief valves are oil tight to oil at 100 C up to tightness test pressure Pt, which depends on the setting pressure; are mechanically and electrically resistant to vacuum (10 torr);have a mechanical resistance to pressures up to 4 bars. Resistance to dynamical stress The pressure relief valve VP150QT can operate without undue operation in following conditions: Sinus vibrations with frequency <= 120 Hz and amplitude <= 250 µ; Dynamical conditions causing following accelerations: - Max 3g in all directions, sinuss vibration, amplitude <= 20 mm; - Shock condition with max 10 g in all directions. Surface protection Flange, shutter, cover and contact s casing are painted internally and externally with one primer coat of epoxy paint and externally with a finishing coat of polyurethane paint colour RAL The primer coat on the internal surfaces in contact is compatible with transformer mineral oil up to temperatures of 120 C. Total thickness of the two coats is 120 microns; special painting cycle can be provided for transformer located in very polluted areas

3 Operation and installation Operation Should an overpressure inside the transformer tank build up due to short circuit or else, higher than the set operation pressure of the pressure relief valve, the shutter lifts from the flange propelled by the pressure, opening the discharge section. The oil can flow out thus reducing the overpressure; at the same time the optical indication and the electric contact show that the valve has operated. When the overpressure has been discharged the valve shuts again automatically to complete oil-tightness. The oil discharged by the valve remains inside the oil-tight cover and can be ductedd to an appropriate container by a pipe flanged to the cover. Thanks to the design of the pressure relief valvevp150qt and their springs, the full opening is reached even for small overpressures, so as to reduce the resistance to the oil flow. Importance of the electricc contact Real life tests have shown, that failures of the transformer followed by sudden pressure increases, such as for instance short circuits, induce the operation of the pressure relief valve in time spans which are considerably shorter (few miliiseconds) than that of other safety devices, such as the Buchholz Relay. Installation Use one pressure relief device for each litres of transformer oil capacity of fraction thereof The pressure relief valve should be installed, either in horizontal or vertical position, on the transformer tank, as near as possible to possible failure sources or in a central position to such sources. Setting The setting of the pressure relieff valve VP150QT is effected by choosing a different spring for every operating pressure value; therefore the setting of the pressure relief valve can be changed only at the factory, thus eliminating possible misuses. The performance of the pressure relief valves depends from the test fluid and the layout of the transformer tank. The pressuree values listed below are obtained by operating the valves with compressed air on a test bed having a compressed air volume of 150 dm 3. To avoid oil leakage or undue operation of the valve, the operating pressure must be chosen so that in normal operation the corresponding maximum operating pressure is never reached. In following table are indicated the tolerance of the pressure setting, the service pressure, the closing pressure and the tightness pressure for the different nominal pressure settings. Pn Pmin Pmax Pe Pc Pt [bar] - % [bar] + % [bar] [bar] [bar] [bar] 0,3 0 0, ,39 0,19 0,18 0,24 0,4 5 0, ,48 0,31 0,26 0,32 0,5 5 0, ,58 0,35 0,30 0,43 0,6 5 0, ,66 0,46 0,35 0,54 0,7 3 0, ,77 0,53 0,44 0,63 0,8 3 0,78 8 0,87 0,62 0,50 0,72 0,9 3 0, ,98 0,74 0,60 0,81 1,1 0 1,10 8 1,19 0,88 0,75 0,99 1,3 0 1,30 8 1,40 1,00 0,95 1,17 1,5 0 1,50 7 1,60 1,20 1,10 1,35 Pn (nominal pressure) is the setting pressure of the pressure relief valve, on which the tolerance must be applied in order to determinatee the minimum and maximum operating pressure. Pmin, Pmax (minimum and maximum operating pressure) are the limits of the pressure range inside which the pressure relief valve must operate. Pe (service pressure) is the maximum pressure the pressure relief valve can withstand without showing oil leakage or oil loss. Pc (closing pressure) is the minimum pressure at which the valve closes after operation Pt (tightness test pressure) is the pressure at which the valve if tested during the leakage tests.

4 Electric contacts The contacts are microswitches changeover type and are mechanically operated by the shutter; after operation the contacts remain in trip position and have to be resetted manually by pushing the red pin indicator located on the cover of the PRD; contacts are assembled inside a terminal box and can be connected by means of a terminal board. Characteristic of contact (low current contacts are available on demand) Degree of protection of contact IP 67 Lever and pushbutton Stainless steel Contact material Nickel coated silver Mechanical endurance of contact 1x10 7 cyles Temperature range -40 C C Standard interruption power AC 250V-5A - DC 125V-1A Short endurance interruption power DC 125V-1,5A Insulation to earth at 20 C 2.500V Insulation of open contact at 20 C 1.500V Minimum and maximum current 1,0-10A Degree of protection of terminal box IP 65 Insulation to earth at 20 C 2.500V Compatibility of installationn The installation compatibility of the pressure relief valve VP150QT depend mainly on the material used for the gaskets; therefore the executions differ because of the used gaskets. Execution N (Standard) nitrile rubber gaskets (N) Admitted operating conditions are: Environmental conditions. Ambient temperature: -20 C to +50 C Relative humidity: 95% to 20 C - 80% to 40 C - 50% to 50 C Insulating liquid (transformer mineral or silicon oil). Temperature: -20 C to C Execution L (on demand) - nitrile rubber gaskets (HNBR) for low temperatures (L) Admitted operating conditions are: Environmental conditions. Ambient temperature: -40 C to +50 C Relative humidity: 95% to 20 C - 80% to 40 C - 50% to 50 C Insulating liquid (transformer mineral or silicon oil). Temperature: -40 C to C Execution V (on demand) fluor rubber gaskets (Viton V) Admitted operating conditions are: Environmental conditions. Ambient temperature: -15 C to +50 C Relative humidity: 95% to 20 C - 80% to 40 C - 50% to 50 C Insulating liquid (transformer mineral or silicon oil). Temperature: -15 C to C Special executions For other environmental and/or operating conditions to be examined individually.

5 Ordering Instructions When ordering following data must be defined: - Model of pressure relief device : VP150 QT - Operating conditions (type of gasket required, ref to paragraph 6) : N; L; V - Wiring diagram (ref to drawing 1373) : H; W - Nominal operating pressure in kpa (or bar) See table below Example Nr 3 PRD type VP150QTNH050; means that are required nr 3 valve VP150QT, climatic standard operating conditions, wiring diagram H (1 changeover contact) and setted at 50 Kpa. MARKING ON DATA PLATE VP150QT N H MODEL OPERATING CONDITIONS WIRING DIAGRAM OPERATING PRESSURE VALUE kpa LEGENDA 025 OPERATING VALUE 25kPa 030 OPERATING VALUE 30kPa 035 OPERATING VALUE 35kPa 040 OPERATING VALUE 40kPa 045 OPERATING VALUE 45kPa 050 OPERATING VALUE 50kPa 055 OPERATING VALUE 55kPa 060 OPERATING VALUE 60kPa 070 OPERATING VALUE 70kPa 080 OPERATING VALUE 80kPa 085 OPERATING VALUE 85kPa 090 OPERATING VALUE 90kPa 110 OPERATING VALUE 110kPa 130 OPERATING VALUE 130kPa 150 OPERATING VALUE 150kPa F H W W/OUT CONTACTS 1 SPDT CONTACTS 2 SPDT CONTACTS N L V STANDARD CONDITIONS NBR GASKETS LOW TEMPERATURE GASKETS HIGH TEMPERATURE VITON GASKETSS

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