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AUMSHIVAY ENGINEERING PRIVATE LIMITED

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

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

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E-mail:[email protected]

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

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

Содержание MC 12A

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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