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JEP0-IL9554

 

Guarantee

                                                                                       

 

 

1.

 

Guarantee period 

The guarantee period of this product should be one year after delivery, unless otherwise specified by both 
parties. 

2.

 

Scope of guarantee 

When any fault or defect is detected during the period of guarantee and such fault or defect is proved to be 
caused  apparently  at  the  responsibility  of  MITSUBISHI  ELECTRIC  CORPORATION,  the  defective  unit 
concerned will be repaired or replaced with substitute with free of charge. However, the fee for our engineer 
dispatching to site has to be covered by the user. Also, site retesting or trial operation caused along with 
replacing the defect units should be out of scope of our responsibilities. 
It is to be acknowledged that the following faults and defects should be out of this guarantee. 
(1)  When  the  faults  or  defects  are  resulted  from  the  use  of  the  equipment  at  the  range  exceeding  the 

condition/environment requirements stated in the catalogue and manual. 

(2) When the faults or defects are resulted from the reason concerning without our products. 
(3) When the faults or defects are resulted from the modification or repair carried out by any other entity than 

MITSUBISHI ELECTRIC CORPORATION. 

(4) When the faults or defects are resulted from a phenomenon which cannot be predicted with the science 

and technology put into practical use at the time of purchase or contract 

(5) In case of integrating our products into your equipment, when damages can be hedged by the proper 

function or structure in the possession of your equipment which should be completed according to the 
concept of the de fact standard of industry. 

(6)  In  case of  that  the  faults  or  defects  are  resulted  from  un-proper application being  out  of  instruction of 

MITSUBISHI ELECTRIC CORPORATION. 

(7) In case that the faults or defects are resulted from force majeure such a fire or abnormal voltage and as 

an act of God such as natural calamity or disaster. 

3.

 

Exclusion of loss in opportunity and secondary loss from warranty liability 

Regardless  of  whether  in  guarantee  period  or  not,  MITSUBISHI  ELECTRIC  CORPORATION  shall  not  be 
liable  for  compensation of  damages  caused  by  any  cause  found not  be  the  responsibility of  MITSUBISHI 
ELECTRIC CORPORATION, loss in opportunity, lost profits incurred to the user by failures of MITSUBISHI 
ELECTRIC CORPORATION products, 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 combination. Also, the user is requested to confirm the 
suitability  of our  products  to  your  applied  system or  equipment  or  apparatus  by  yourself.  MITSUBISHI 
ELECTRIC CORPORATION shall not be liable for any suitability of our products to your utilization. 

(2)  This  product  has  been  designed  and  manufactured  for  application  in  general  industries,  etc.  Thus, 

application in which the life or an asset could be affected by special application such as medical system 
for life-sustaining, in nuclear power plants, power plants, aerospace, transportation devices (automobile, 
train, ship, etc.) shall be excluded from the application. In addition to above, application in which the life or 
an asset could be affected by potentially chemical contamination or electrical interference and also in which 
the circumstances and condition are not mentioned in this manual shall be excluded from the application.

 

Note even if the user wants to use for these applications with user’s responsibility, the user to be requested 
to approve the specification of MITSUBISHI ELECTRIC CORPORATION products and to contact to the 
technical section of MITSUBISHI ELECTRIC CORPORATION prior to such applications. If the user applies 
MITSUBISHI  ELECTRIC  CORPORATION  products  to  such  applications  without  any  contact  to  our 
technical section, MITSUBISHI ELECTRIC CORPORATION shall not be liable for any items and not be 
insured, independently from mentioned in this clause. 

(3) In using this product, the working conditions shall be that the application will not lead to a major accident 

even if any problem or fault occur, and that backup or duplicate system built in externally which should be 
decided based on the importance of facility, is recommended. 

(4) The application examples given in this manual are reference only and you are requested to confirm function 

and precaution for equipment and apparatus and then, use our products. 

(5) The  user  is  requested  to  understand  and  to  respect  completely  all  warning  and  caution  items  so  that 

unexpected damages of the user or the third party arising out of incorrect application of our products would 
not be resulted. 

 

Summary of Contents for MELPRO MDG-A3V-R

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 ...

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