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Mitsubishi Electric MELPRO MOC-A3T-R, Инструкция по эксплуатации

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JEP0-IL9553

 

MOC-A3 Series Over Current Relay [Standard: JIS C 4602 (2017)] 

 

Features 

1.  Various operating time characteristics. 

Time-lag element: 4 types (EI, VI, NI, DT) 

Instantaneous element: 2 types (2 steps, 3 steps) 

2.  Alert  function  which  detects  the  difference  between 

setting frequency and injected frequency. 

3.  The fault value record function is installed. 

 

4.  Good operability and visibility design is adopted.  

The numerical display turns on for 3 seconds when the 

setting  value  is  changed,  which  enables  to  check 

setting values easily. 

5.  The power supply can be derived from CT secondary. 

6.  Panel cutout is the same as previous MELPRO-A series 

and E series. 

Ratings and Specifications

 

Type name 

MOC-A3V-R 

MOC-A3V-RD 

MOC-A3T-R 

Style No. 

102PGA 

518PGA 

103PGA 

Tripping method 

Voltage tripping 

Current tripping 

Ratings 

Phase current 

5A 

Frequency 

50/60Hz (switchable) 

Setting 

Time-lag element 

Operation value 

LOCK

(*)

-3-3.5-4-4.5-5-6A 

Dial 

0.25

(*)

-0.5-1-1.5-2-2.5-3-3.5-4-5-6-7-8-9-10-20 

Instantaneous element 

Operation value 

LOCK

(*)

-10-15-20-25-30-35-40-50-60A 

Using 
condi

tion 

Frequency 

50Hz(SW1-ON) - 60Hz

(*)

(SW1-OFF) 

Instantaneous 

step number 

3steps(SW2-ON) 

–

 2steps

(*)

(SW2-OFF) 

Instantaneous 

sensitivity 

20%

(*)

 (SW3-OFF,SW4-OFF) 

40% (SW3-OFF,SW4-ON) 

60% (SW3-ON,SW4-OFF) 
80% (SW3-ON,SW4-ON) 

(Caution) If  the  operation  value  of instantaneous  element is  set  to  10A, the 
sensitivity setting of 20% is not allowed. If you do that, the relay operates 
as 2-step characteristic. 

Operating time 

characteristics 

(Time-lag) 

Extremely inverse (EI)

(*)

 (SW5-OFF,SW6-OFF) 

Very inverse (VI) (SW5-OFF,SW6-ON) 

Normal inverse (NI) (SW5-ON,SW6-OFF) 

Definite time (DT) (SW5-ON,SW6-ON) 

Display 

Self-monitoring 

The "RUN" indicator (green-color) is lighted when current exceeds 1.5A in normal 
condition. 

Operation indicator 

R-phase,  T-phase,  Instantaneous:  The  indicator  turns  from  black  into  orange 
color when the protection element is put into operation. 
(Manual resetting type) 

Numerical display 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

※

1 "Lo." means LOCK setting (the protection element is locked). 

※

2 This shows current sensitivity (ratio to operation value) when setting 3-

step characteristic in instantaneous element. None is displayed when 
setting 2-step characteristic. 

Indication item 

Range 

Current measurement 

2.0

～

9.9A,10

～

30A 

Time lapse 

0

～

10 

Time-lag element 

current setting 

Lo.

(

※

1)

,3

～

6A 

Dial setting 

0.25

～

20 

Instantaneous element 

current setting 

Lo.

(

※

1)

,10

～

60A 

Number of step setting 

2,3 steps 

Sensitivity setting 

(

※

2)

 

20,40,60,80% 

Operating time 

characteristics setting 

EI,VI,NI,DT 

Frequency setting 

50,60Hz 

Fault record 

3.0

～

9.9A,10

～

80A 

Clear fault record 

O.K. 

 

 

Содержание MELPRO MOC-A3T-R

Страница 1: ...1 JEP0 IL9553 Request Ensure that this Instruction Manual is delivered to the end users and the maintenance manager ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 6: ...eous sensitivity 20 SW3 OFF SW4 OFF 40 SW3 OFF SW4 ON 60 SW3 ON SW4 OFF 80 SW3 ON SW4 ON Caution If the operation value of instantaneous element is set to 10A the sensitivity setting of 20 is not allowed If you do that the relay operates as 2 step characteristic Operating time characteristics Time lag Extremely inverse EI SW5 OFF SW6 OFF Very inverse VI SW5 OFF SW6 ON Normal inverse NI SW5 ON SW6 ...

Страница 7: ...on CT Normal 3 5VA Operating 4 5VA Case Munsell color Unit fixed type Fig 1 11 0 6B7 6 0 2 Unit drawer type Fig 1 12 0 6B7 6 0 2 Unit fixed type Fig 1 11 0 6B7 6 0 2 Mass Approx 1 0kg Approx 1 1kg Approx 1 0kg shows factory setting ...

Страница 8: ...17 1 80 12 1 80 17 1 80 12 1 80 12 Instantaneous element 50ms or less Input 200 of setting value Refer to Fig 1 1 3 for characteristic example Overshoot time characteristics Time lag element Dial 10 Input 1000 of setting value Applied time 90 of theoretical operating time The relay shall not operate Temperature characteristics Time lag element Ambient temperature 20 or 60 Operation value Within 20...

Страница 9: ...for 2 seconds Between all CT circuits and external box Between all control circuits and external box Setting Minimum operation value and minimum operating time Input 80 of time lag element operation value Criteria No malfunction Radio disturbance Intermittently irradiate radio waves to the front panel of the relay with a transceiver of 150MHz or 400MHz band 5W output from a distance of 0 5m Settin...

Страница 10: ...s Current multiples to the setting I EI characteristic 2 5 20 0 25 0 5 1 1 5 2 2 5 5 10 20 Dial D 0 01 0 1 1 10 100 1000 1 10 Operating time T s Current multiples to the setting I VI characteristic 2 5 20 0 25 2 5 5 10 20 Dial D 0 5 1 1 5 2 3 3 5 4 Extremely inverse EI T 80 𝐼2 1 𝐷 10 s Very inverse VI T 13 5 𝐼 1 𝐷 10 s ...

Страница 11: ...s Current multiples to the setting I NI characteristic 2 5 20 2 5 5 10 20 Dial D 1 1 5 2 3 0 5 0 25 0 01 0 1 1 10 100 1000 1 10 Operating time T s Current multiples to the setting I DT characteristic 2 5 20 2 5 5 10 20 Dial D 1 1 5 2 3 0 5 0 25 3 5 4 6 Normal inverse NI T 0 14 𝐼0 02 1 𝐷 10 s Definite time DT T 2 𝐷 10 s ...

Страница 12: ...stics 20 40 60 80 100 120 140 160 180 200 500 450 400 350 300 250 200 150 100 50 0 Current multiples to the setting Operating time ms 20 40 60 80 100 120 140 160 180 200 500 450 400 350 300 250 200 150 100 50 0 20 40 60 80 Sensitivity setting in 3 step characteristic Current multiples to the setting Operating time ms ...

Страница 13: ...x 60ms after holding when input current is less than the setting value 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 Freque ncy SW2 Inst Step No ON 50Hz ON 3steps OFF 60Hz OFF 2steps SW3 SW4 Inst Sensitivity OFF OFF 20 OFF ON 40 ON OFF 60 ON ON 80 SW5 SW6 Time curve OFF OFF EI OFF ON VI ON OFF NI ON ...

Страница 14: ... of larger one among two phases is recorded The relay can save the newest single phenomenon The record is saved in the non volatile memory therefore the record can be read again after shutting the power off Note that the fault record may not be saved if the input current is turned off soon after the relay operation Clearing of fault records Set indicator select switch to CLEAR FAULT REC and hold f...

Страница 15: ...it E C1R C2R C2T C1T a2 a1 D T1 T2 52a Pallet switch Auxiliary power supply Current changeover switch Tripping route When a fault occurs the trip contact between and closes then trip coil of CB is energized and make CB trip c No voltage tripping type MOC A3V R S T CB CT Load side TC1 Current changeover switch A No voltage tripping coil To alarm circuit E C1R C2R C2T C1T a2 a1 D T1 T2 Pallet switch...

Страница 16: ...onnection This figure shows the connection of current tripping type For voltage tripping type the terminal number should be changed as below T1R T1 T1T T2 C2T2R C2R C2T2T C2T Fig 1 5 Connection example Test A relay test is carried out sufficiently before shipment but at the following cases it is recommended the test should be carried out again a When the products are delivered and unpacked b At th...

Страница 17: ... setting Minimum setting 10 of setting value Instantaneous Each setting 15 of setting value Operating time Time lag 300 of setting Minimum setting Characteristic control point of operating time 17 of nominal value 700 of setting 12 of nominal value Instantaneous 200 of setting Minimum setting 50ms or less 5 Example of operation test circuit The circuit examples of the overcurrent relay test equipm...

Страница 18: ...1 a2 9 9 9 9 9 9 14 MOC A3V R MOC A3V RD C1R T1R C2 T2R C2 T2T T1T C1T a2 a1 9 5 9 5 9 5 9 5 9 5 9 5 9 5 9 5 9 5 9 5 MOC A3T R Do not connect to the terminals or the relay may not operate properly The terminal is junction terminal for grounding wire if there was grounding wire in the existing relay Fig 1 7 Terminal layout ...

Страница 19: ...t 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 supply The CT circuit is equipped with an automatic short circuit piece so that the CT seconda...

Страница 20: ...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 ...

Страница 21: ...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 1 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...

Страница 22: ...plied 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 re...

Страница 23: ...HEAD OFFICE 7 3 MARUNOUCHI 2 CHOME CHIYODA KU TOKYO 100 8310 JAPAN First edition Oct 2020 ...

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