Mitsubishi Electric MELPRO MDG-A3V-R, Instruction Manual

Page 1: ...1 JEP0 IL9554 Request Ensure that this Instruction Manual is delivered to the end users and the maintenance manager ...

Page 2: ...t Failure to do so may lead to the risk of electric shock equipment failure malfunction or failure to operate Ensure that the equipment is connected correctly in accordance with the details e g polarity or phase sequence shown on the connection terminals Otherwise there is the risk of failure burning malfunction or maloperation All power supplies and transformers to the equipment must be of suitab...

Page 3: ...el Otherwise there are risks of electric shock injury failure malfunction and maloperation Handling and maintenance of the equipment must only be carried out after gaining a thorough understanding of the instruction manual Otherwise there is the risk of electric shock injury failure malfunction or maloperation When replacing the equipment use a product of same model rating and specifications Other...

Page 4: ... special damages and secondary damages whether foreseeable or not compensation for accidents and compensation for damages to products other than MITSUBISHI ELECTRIC CORPORATION products and other tasks 4 Applications of products 1 The user is requested to confirm the standards the regulations and the restrictions which should be applied in case of utilizing this product and another one in combinat...

Page 5: ...ecommended to replace 2 Product supply including repair parts is not available after production is discontinued 6 Changes in product specification The specification given in the catalogue manuals or technical documents are subject to change without prior notice 7 Scope of service The technical service fee such as engineer dispatching fee is excluded in the price of our products Please contact to o...

Page 6: ...requency 50 60Hz switchable Auxiliary power supply AC110V Range 90 120V Settings I0 Operation value 0 1 0 2 0 4 0 6 0 8 1 0A ZCT primary value V0 Operation value LOCK 2 2 5 3 4 5 6 7 7 5 8 9 10 Single phase fault in 6 6kV power systems V0 primary 3810V ZVT secondary 7V Operating time Instantaneous 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 0s Using condi tion Frequency 50Hz SW1 ON 60Hz SW1 OFF Output conta...

Page 7: ... 6kg Approx 0 7kg shows factory setting Note It is necessary to combine MZT type ZCT and MPD 3 type ZVT with MDG A3V relay Don t combine other transformers with this relay Application to 3 3kV system voltage The MPD 3 type ZVT is intended for use at 6 6kV system voltage When applied to a system voltage of 3 3 kV ZVT secondary output voltage at single phase fault is 3 5V Half of the rating voltage ...

Page 8: ...ax sensitivity angle 45 Max sensitivity angle 10 Lag 45 20 Lead 135 20 0 2 0 4 0 6 0 8 1 0A 90 90 180 0 Operation area Non operation area Max sensitivity angle 45 For non grounding system 0 2 0 4 0 6 0 8 1 0A 90 90 180 0 Max sensitivity angle 10 For reactor grounding system 25 65 50 85 115 155 130 Lead Lag V０ V０ Operation area Non operation area Lead Lag Operating time characteristics Input V0 0 1...

Page 9: ...Apply standard waveform 1 2 50 μs to positive negative pole for 3 times respectively Between ZVT ZCT primary and earth 60kV Between all circuits of the relay and earth E terminal 4 5kV Between ZVT ZCT secondary and control circuit 4 5kV Between contact terminal and power supply terminal 3 0kV Between terminals of power supply 3 0kV Noise proof Apply damped oscillatory wave prescribed in JIS C 4609...

Page 10: ...and time Set the setting values The black part is equal to maximum value but the numerical display is turned off Don t leave the switches with halfway state Setting switches for using condition Don t use any tool with a sharp point when the switches are set It may cause damage to the switch lever SW1 Frequency ON 50Hz OFF 60Hz SW2 Output contact ON Self hold Ho OFF Auto reset FU SW3 Max sensitivit...

Page 11: ...esidual V0 voltage in sound condition I0 current measurement The display shows the value of zero sequence current The display range is from 0 05A to 1 5A If input current is less than 0 05A the display goes out If input current is more than 1 5A the error message Ｏ Ｆ is displayed Phase measurement The display shows the phase of zero sequence current relative to the zero sequence voltage The displa...

Page 12: ...y that supplies V0 voltage from the expansion terminals must receive V0 voltage directly from the MPD 3 type ZVT Each relay directly connected to the ZVT can supply V0 voltage for 20 relay units Note To supply V0 voltage from the expansion terminals the control power of the supply source relay must be turned on The relay that receives V0 supply from the expansion terminals cannot be operated if th...

Page 13: ...ed the number of connectable relays is limited to 5 Don t exceed the maximum number of relay units If many units more than the limitation are needed to apply V0 voltage supply V0 from expansion terminals M N to Y1 Y2 terminals The MDG A3V relay that supplies V0 voltage from the expansion terminals must receive V0 voltage directly from the MPD 3 type ZVT Each relay directly connected to the ZVT can...

Page 14: ...T The secondary terminal k ℓ and the test terminal kt ℓt are double nuts The wiring is connected between the nuts When connecting do not loosen the inner side ZCT side nut 4 Polarity Polarity is very important to this relay Please pay attention to polarity for connecting from ZCT and ZVT and grounding point is also important 5 ZVT position The position of ZVT does not affect the characteristics or...

Page 15: ...ic inspection Usually once a year 1 At the time of testing The input waveform should be a sine wave with little distortion During the test set the position of the indicator select switch to V0 MEASURE I0 MEASURE PHASE MEASURE or PICKUP Set the other setting switches according to the test conditions of the operating characteristic control point If user defined control point is specified e g accurac...

Page 16: ...output contact can be forced to operate except for the case of LOCK setting 4 Operation characteristic control point Perform the test periodically according to the following test conditions and criteria Test item Test condition Criteria I0 setting V0 setting Time setting Input I0 operation value Each setting Minimum Instantaneous V0 Setting 150 at the max sensitivity angle 10 of setting value V0 o...

Page 17: ...est method using relay tester Notes These figures show that the V0 voltage is applied from the primary side high voltage side of MPD 3C capacitor simultaneously in three phase If the V0 voltage is applied from the test terminal T of MPD 3T the voltage value should be one tenth of the value from MPD 3C high voltage side Do not apply voltage into test terminal T more than 380V If there is no test te...

Page 18: ...hold the drawer handle or the frame part when transporting Touching the electrical circuit may cause electric shock or damage to the circuit Before the subunit is to be drawn out ensure that the following items are checked in order not to carry out the work in hot line condition Lock of the tripping circuit Turning off the main circuit Disconnect CT VT circuit Turning off the auxiliary power suppl...

Page 19: ...the subunit with your finger hooked on the drawer handle on both sides Support the frame of subunit and pull out 2 Procedure of housing Drawer fixing screw Support the frame of subunit and place the subunit in the case along the rails Insert the subunit into the case horizontally Open the cover and tighten the drawer fixing screw Cover Cover ...

Page 20: ...p the upper side of the cover from the inner surface Then remove from the protrusion of the body Installing the cover As shown in Fig 2 10 mount the holes on the upper side of the cover to the protrusion of the body Then press down lightly on the lower side of the cover and mount to the protrusion of the body in the same way as above When replacing the cover during operation be careful not to touc...

Page 21: ...ied to the protection relay have limited lifetime which will bring the degradation to the relay The degree of degradation will be variable depending on the purpose aging usage environment and unevenness on the performance of each part Our company designs its products so that the recommended renewal period is 15 years or more However there may be some possibilities to occur any failures before reac...

Page 22: ...HEAD OFFICE 7 3 MARUNOUCHI 2 CHOME CHIYODA KU TOKYO 100 8310 JAPAN First edition Jan 2021 ...