ISO 9001 2015 ISO 14001 2015 RƠ LE ÁP SUẤT ĐỘT BIẾN TỔNG CÔNG TY THIẾT BỊ ĐIỆN ĐÔNG ANH – CÔNG TY CỔ PHẦN Địa chỉ Thị trấn Đông Anh – Hà Nội ĐT (84 4) 38833779 – Fax (84 4) 38833113 Email mail@eemc co[.]
ISO 9001:2015 ISO 14001:2015 RƠ LE ÁP SUẤT ĐỘT BIẾN TỔNG CÔNG TY THIẾT BỊ ĐIỆN ĐÔNG ANH – CÔNG TY CỔ PHẦN Địa chỉ: Thị trấn Đông Anh – Hà Nội ĐT: (84.4) 38833779 – Fax: (84.4) 38833113 Email: mail@eemc.com.vn * Website: www.eemc.com.vn DOMD033 INSTRUCTION MANUAL SUDDEN OIL PRESSURE RELAY TYPE PVOAY22 (2 contact) HYODA INSTRUMENTS CORPORATION DOMD033 The HYODA Sudden Oil Pressure Relay is highly recommended that oil immersedelectrical equipment such as transformer and reactors shall be provided with safety device that is securely protect an equipment from potential damage caused by internal faults Features (1) If an accident occurs in a equipment, this relay quickly responds to fluctuations in the internal pressure and works even if a pressure difference is slight Therefore the time between the occurrence of an accident and shutdown can be extremely shortened (2) Since this relay is mainly to be installed the tank side of a transformer (3) This relay uses microswitch for the electric contact, which ensures switching and high reliability Structure The structure of this relay is shown in Fig As shown in the figure, The body is made of aluminum alloy casting which provides high air tightness The internal section is composed of a movement bellows, pressurereceiving bellows, orifie(equalizer) and micrositch The switch terminal is to be taken out of the upper terminal box Operation When the internal pressure of the transformer tank rises rapidly due to an accident in the transformer, the hydraulic pressure compresses the pressurereceiving bellows, which pushes UP the movement bellows The motion of the top of the movement bellows pushes in the microswitch lever activating the contact If hydraulic pressure fluctuation in the transformer are negligible, the microswitch will not be activated regardless of the numerical value of the pressure Due to the capacity limit in the bellows, if the normal pressure at the Installation position exceed 0.027MPa (about 3m of oil head), this Relay may not operate properly DOMD033 Fig.1 SUDDEN OIL PRESSURE RELAY No Name Cover Equalizer Movement bellows Case Operation check shaft Operation check cap Pressurereceiving bellows Microswitch Name plate 10 Rellef plug DOMD033 Operation characteristics Fig.2 shows the operating characteristics of this Relay The yaxis represents the value of pressure increase in the transformer tank: the x axis represents the time between the occurrence of pressure increase and the activation of the microswitch The diagonal broken line in the figure indicates the rate of pressure increase in the transformer The intersection of the broken line and the curve thick line indicates the corresponding operation time Minimum operating pressure difference: 0.025+30% (MPa) Minimum operating pressure increase rate: 0.005+40% (MPa/ sec) As this evident from the operating characteristics shown in Fig.2, this Relay instantly responds to such a rapid pressure increase as expected in the case of an accident in a transformer: the higher the rate of pressure increase is, the quicker the operating time becomes Fig.2 Operating characteristic curve of Impact Hydraulic Relay Type: PVOAY22 DOMD033 Contact operation check (1) Keep a value open it a valve is provided in between the Relay and the transformer tank (2) Disconnect an auxiliary Relay circuit from the Relay Connect a test light circuit (3) Dismount the cap of the inspection shaft that is attached under the Relay housing (4)Quick push the inspection shaft brim by hand So that the pressurereceiving bellows is pushed up and actuate a switch (5)After the test is carried out, the cap of inspection shaft should be screwed original oosition Handling caution (1) If the Relay is given a shock during transportation, its function could be deteriorated For the transportation, remove the Relay from the transformer and transport it separately (2)This Relay is mounted on the transformer tank side wall in between 0.5~3meter below an oil top level, using a butterfly valve, etc whose opening area should be as large as possible (3) After the Relay is properly mounted the air vent (fig,1 number 10) should be opened to allow a little of an oil to flow out Then, close the air vent ... pushes in the microswitch lever activating the contact If hydraulic pressure fluctuation in the transformer are negligible, the microswitch will not be activated regardless of the numerical value... the transformer tank side wall in between 0 .5~ 3meter below an oil top level, using a butterfly valve, etc whose opening area should be as large as possible (3) After the Relay is properly mounted... SUDDEN OIL PRESSURE RELAY TYPE PVOA? ?Y22 (2 contact) HYODA INSTRUMENTS CORPORATION DOMD033 The HYODA Sudden Oil Pressure Relay is highly recommended that oil immersedelectrical equipment such as