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AUMSHIVAY ENGINEERING PRIVATE LIMITED 

 

 

B-21, Bhan Nagar, Queens Road, Jaipur-302021

 

Website: www.aumshivay.com, www.omengineering.in

 

E-mail:admin@aumshivay.com

 

 

 

 

 

 

 

 

 

 

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REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012 

TM 

 

TM 

 

  

FEEDER PROTECTION RELAY 

                        

      

               

 

Feeder Protection Relay (MC12A);

 

Relay MC12A is a single phase, non-directional, over current or Earth fault 

relay with one measuring element. The relay can be used for feeder protection in all low voltage, medium voltage and high 

voltage sub-stations. The relay has a built in high set facility. DIP switches are provided on the front panel for pick up and 

time delay settings. User has a choice of 7 trip time characteristics. 

 

 

 
 
 
 
 

 
 
 
 

FEEDER PROTECTION RELAY (MC12A) 

Item 

Feeder Protection Relay 

Make 

L&T 

Model 

MC 12A  

Specifications 

1 phase, non-directional, Over Current or 
Earth Fault Relay 

Applications 

The relay can be used for feeder protection in 
all low voltage, medium voltage sub-stations. 
The relay has a built in high set facility. DIP 
switches are provided on the front panel for 
pick up and time delay settings. 

Features 

Dual CT Rating 

Draw out type construction 

Micro controller based design 

7 types of trip time characteristics available 

Summary of Contents for MC 12A

Page 1: ...b stations The relay has a built in high set facility DIP switches are provided on the front panel for pick up and time delay settings User has a choice of 7 trip time characteristics FEEDER PROTECTIO...

Page 2: ...1987 a Normal Inverse 3s b Normal Inverse 1 3s c Very Inverse d Extremely Inverse Definite time Three curves as follows e Definite Time 1s f Definite time 10s g Definite time 100s Accuracy As per Erro...

Page 3: ...iliary Supply 24 240 V AC DC Wide TMS Range 0 01 1 60 Draw out execution With automatic CT shorting facility Instantaneous Over current and earth fault element Communication Through Modbus Protocol on...

Page 4: ...Stator Ground Fault protection MG30 incorporates 5 output relays expandable up to 16 with the additional module REX 8 Features Voltage controlled over current protection Thermal image element with pr...

Page 5: ...Instantaneous output 30ms 2 Harmonic restraint level 2H 0 1 1 0 Id step 0 01Id First percent bias 0 5 IR In P 1R 2 20 step 1 Second percent bias IR In P 2R 5 50 step 1 Point of slope variation P 1 3 s...

Page 6: ...0 to 40 of In in steps of 5 or 20 to 80 of In in steps of 10 CT Burden Less than 1 0 VA at Is min Less than 6 VA at Is max Operating Characteristics Front panel programmable using push buttons Pick up...

Page 7: ...se Cts 1 9999 A step 1A On Rated primary current of earth fault detection Cts 1 9999 A step 1A CT Burden Less than 1 0 VA at Is min Less than 6 VA at Is max Operating Characteristics Front panel progr...

Page 8: ...utomatically manage the starting transition Switch over transition current Itr 0 1 1 Ist step 0 1Ist Maximum switch over time delay tTr 0 5 50 s step 0 1s At motor s start counting of tTr begins If du...

Page 9: ...pick up level A DIP switch is provided for selection of thermal overload trip class and enable disable of Locked rotor protection and under current protection Other settings are prefixed in the relay...

Page 10: ...3 sec Both factory set Locked rotor protection Locked rotor current 3 Im Trip time delay 1 sec Both factory set Disable feature Available Under Current protection Under current threshold 50 of Im Tri...

Page 11: ...d applicable time delays are indicated on a label on right hand side of the unit The wiring diagram label is provided on the left hand side of the unit Display Current and Thermal Capacity Display Dur...

Page 12: ...l through various settings Function LED showing number or alphabet to indicate which setting is being view as shown in Figure 3 Table 1 gives description of each setting APPLICATIONS MPR 300 offers yo...

Page 13: ...dVB IdVC Maximum Demand and Inrush Recording IdA IdB IdC Ido I1A I1B I1C I2A I2B I2C IdIIA IdIIB IdIIC IdVA IdVB IdVC Programmable Input Quantities Fn System frequency 50 60 Hz 1In Rated primary curre...

Page 14: ...1In Detection time 6ms t 20ms Peak current detection with DC offset restraint Digital Inputs B1 Operation block input B2 Harmonic restraint s reduction B3 Oscillographic record external trigger Approv...

Page 15: ...00 ms can be set Current Input 1A 5A Application These relay can be used for differential protection of generators REF applications of generators and transformers in all low voltage medium voltage sub...

Page 16: ...nt Function enabling Enable Disable Setting range V 0 5 1 50 Vn step 0 01Vn Instantaneous output 0 03s Trip time delay tV 0 05 60 s step 0 01s F59 V Second OverVoltage Element Function enabling Enable...

Page 17: ...alanced Overvoltage Element Function enabling Enable Disable Setting range V2 0 1 1 5 Vn step 0 01Vn Instantaneous output 0 03s Trip time delay tV2 0 05 60 s step 0 01s Characteristics Accuracy at ref...

Page 18: ...t Characteristics Normal Inverse 3 5 sec in O V mode Normal Inverse 5 7 sec in U V mode Definite Time 1 10 100 Sec Pick up Voltage Same as set Voltage Vs Reset Voltage 90 to 95 of Set Voltage Vs 105 t...

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