Mitsubishi Electric MELPRO MDG-A4V-R, Instruction Manual

Page 1: ...1 JEP0 IL9559 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: ...Auto reset SW2 OFF Display Self monitoring The RUN indicator green color is lighted in normal condition Operation indicator The indicator turns from black into orange color when the protection element is put into operation Manual resetting type Numerical display Indication item Range V0 measurement 1 0 12 0 I0 measurement 0 05 0 09A 0 1 1 5A Phase measurement 0 359 V0 standard I0 lag display V0 I0...

Page 7: ...Operating time T Instantaneous Input I0 1000 of setting value V0 150 of setting value I0 operating area V0 standard Phase setting Max sensitivity angle 45 Lag 45 10 Lead 135 10 0 2 0 4 0 6 0 8 1 0A 90 90 180 0 35 55 125 145 VO Max sensitivity angle 45 Lead Lag Operation area Non operation area Operating time characteristics Input V0 0 150 of setting value I0 0 130 and 400 of setting value at the m...

Page 8: ...oltage Apply standard waveform 1 2 50 μs to positive negative pole for 3 times respectively Between ZCT primary and earth 60kV Between all circuits of the relay and earth E terminal 4 5kV Between EVT 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 4...

Page 9: ...halfway state Setting switches for operation value 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 O...

Page 10: ...function makes it possible to measure the residual 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 relat...

Page 11: ...lease connect terminals between Z2 and f with 2mm2 cable when sub unit of the relay is drew out 3 Don t connect the ℓ terminal of MZT type ZCT to ground Connect line Fig 7 3 External connection diagram AC110V Z1 Z2 P1 P2 E f a110V a190V ED MDG A4V AC110V Z1 Z2 P1 P2 E ED MDG A4V AC110V Z1 Z2 P1 P2 E ED MDG A4V AC110V P1 P2 E ED MVG A4V EA E EA O a b c f U V W EG 5 ED Earthed voltage transformer EV...

Page 12: ...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 Shield grounding of power cable When an electric power cable is used at the primary side of ZCT pa...

Page 13: ...ly 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 accuracy of relay characte...

Page 14: ...teria 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 operation value Minimum Each setting Instantaneous I0 Setting 150 at the max sensitivity angle 10 of setting value Phase characteristics Minimum Minimum Instantaneous V0 Setting 150 I0 Setting 1000 Lag 35 55 Lead 125 145 Operating t...

Page 15: ...to 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 su...

Page 16: ...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 17: ...up 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 7 8 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 18: ...ed 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 reach...

Page 19: ...HEAD OFFICE 7 3 MARUNOUCHI 2 CHOME CHIYODA KU TOKYO 100 8310 JAPAN First edition Mar 2021 ...