An ISO 9001 : 2008 Company MOTOR PROTECTION RELAY · An ISO 9001 : 2008 Company Microcontroller...

MOTOR

PROTECTION

RELAY

www.prokdvs.com

An ISO 9001 : 2008 Company

www.prokdvs.com


Microcontroller Based Motor Protection Relay PD-MMPR-303IEEE Device Code 49, 51, 46, 49S, 37 & 47

Introduction

Features

Prok dv’s make Microcontroller Based Motor Protection Relay PD-MMPR-303 uses the state-of-the-art Microcontroller based measurement techniques for providing protection for Motors up-to 75HP. The comprehensive protection features of the relay makes it ideal for Motor protection. The heart of the relay is microcontroller based reliable hardware with special algorithms to calculate the tripping time. The relay continuously monitors the Three Phase Currents to build the thermal replica of the Motor. This thermal replica is used to protect the Motor against Thermal Over Loads.

The Microcontroller Based Motor Protection Relay does not require external Current Transformer (CT) for its operation. The three phase R, Y and B cables are made to pass through the CT hole which is in the relay. The built in CT’s takes care of stepping down of the Currents to the required level. The stepped down three phase Currents are continuously monitored by the relay to detect any abnormal behavior of the Motor and to make tripping decision.

The following protections offered by Prok dv’s make Microcontroller Based Motor Protection Relay PD-MMPR-303:

ŸThermal Over Load ProtectionŸUnbalance ProtectionŸPhase Reversal ProtectionŸEarth Fault ProtectionŸLocked Rotor ProtectionŸSingle Phasing Protection ŸUnder Current Protection

ŸAccurate and Real Time TRUE RMS measurements.ŸSelectable Thermal Trip Time characteristics Class - 10A, 10, 20 & 30.ŸPre-alarm at 105 % of Im by Potential Free Output Contacts.ŸThermal Memory.ŸContinuous display of measured Healthy / Fault Currents.ŸFault records up to Previous 999 faults and 20 Previous On-Board faults with Date and Time stampings.ŸIncrement / Decrement Key and Mode / Set key in front facia.ŸFail safe / Non-Fail safe Feature.ŸOperational and Type / Nature of Fault indications through OLED.ŸCommunication through Modbus protocol with RS-485 Port.ŸEnable / Disable option for Earth Fault, Under Current, Locked Rotor, Phase Unbalance

Protection.ŸVarious Models with Current ratings.ŸCompact and Reliable.ŸManual TEST / RESET Facility.

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Applications

Specifications

ŸProtection of LV Motors up-to 75HP in Motor Control Centres.

1) Thermal Over Load Protection:

Over Load Current Setting Range 2.0Amps – 96.0Amps in 4 ranges as explained in SL.13

Trip Time Characteristics Class 10A, 10, 20 &30 as per IEC 947-4-1Pre-alarm at 105 % of Im by One set of Potential Free output ContactsThermal Memory Provision

2) Earth Fault Protection

Earth Fault Current Setting Range10% to 50% of Im, in steps of 1% (20% - Factory Set)Trip Time Delay 0.1Sec to 5.0Sec in steps of 0.1Sec (0.1Sec - Factory Set)Enable / Disable Option

3) Phase Unbalance

Unbalance Current Setting Range 10% to 50% of Im, in steps of 1% (40% - Factory Set)Trip Time Delay 0.1Sec to 5.0Sec in steps of 0.1Sec (2.0Sec - Factory Set)Enable / Disable Option

4) Locked Rotor Protection

Locked Rotor Current Range Greater than 3 times of Im (LR Setting can be tailored to customer specific)Trip Time Delay 0.1Sec to 5.0Sec in steps of 0.1Sec (1.0Sec - Factory Set)Enable / Disable Option

5) Under Current Protection

Under Current Setting Range 10% to 50% of Im, in steps of 1% (50% - Factory Set)Trip Time Delay 0.1Sec to 5.0Sec in steps of 0.1Sec (3.0Sec - Factory Set)Enable / Disable Option

6) Loss of Phase / Single Phasing

Applicable when Im Greater than 35% Trip Time Delay Fixed (0.5Sec - Factory Set)

7) Phase Reversal Monitoring

Trip Time Delay Fixed (0.5Sec - Factory Set)

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8) Contacts: 1NO/NC 250V@5A AC, 24V@5A DC Potential-Free Output Contacts for Overload Pre-

alarming Circuit. 2NO/NC 250V@8A AC, 30V@8A DC Potential-Free Output Contacts for Tripping Circuit

for all seven Faults.

9) Auxiliary Power Supply : 85-275V AC / DC

10) Trip Accuracy : As per IEC 947-4-1Trip Class 10A, 10, 20, & 30

11) Pick-Up Accuracy : +/- 12.5%

12) Reset : Manual

13) Models : PD-MMPR-303-1 (2.0Amps-16.0Amps) PD-MMPR-303-2 (16.0Amps-32.0Amps) PD-MMPR-303-3 (32.0Amps-64.0Amps) PD-MMPR-303-4 (64.0Amps-96.0Amps) PD-MMPR-303-11 (1Amps Secondary) PD-MMPR-303-15 (5Amps Secondary)

14) Prok dv’s PD-MMPR-303 Series is available in TWO Versions as 1) Fail safe

2) Non-Fail safe (Non-Fail safe – Factory Set)

15) Communication is through RS-485 MODBUS Protocol (HALF DUPLEX), Baud rate: 9600 bps With Max 30 Devices

16) Mounting : DIN

17) Dimensions in mm : 70X75X109 (WXHXL)

18) Operating Temp : 0⁰c to +60⁰c

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Protections Offered By PD-MMPR-303 Series

Prok dv's make Microcontroller Based Motor Protection Relay PD-MMPR-303 Series is designed to offer the following protections to Low Voltage (LV) 3-Phase induction motors rated up to 75HP. Whenever a Relay detects any of the following faults, Prok dv's make Microcontroller Based Motor Protection Relay having two sets of output changeover potential free contacts, One set of changeover potential free contacts is dedicated for pre-alarm circuit and another set of changeover potential free contacts for Tripping circuit which is common for all the seven faults.

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Prok dv's make Microcontroller Based Motor Protection Relay continuously measures and displays Real Time Motor Current of all the Three Phases. When the Motor Current exceeds the set value Im, the relay issues a trip command after the calculated time elapse (Based on selection of trip Class). The relay displaying the Type / Nature of fault with magnitudes. Exclusive One Set of potential free contacts is provided in the relay for pre-alarm circuit when the Motor Current exceeds 105% of Im and the relay has two sets of potential free contacts for tripping circuit. The relay monitors the Currents continuously and using this data it builds Thermal replica of the Motor and monitoring the Thermal status of the Motor. This information is used to protect the Motor against Thermal Over Loading.

2. Earth Fault Protection:Prok dv's make Microcontroller Based Motor Protection Relay senses the Zero

sequence components of the TRUE RMS Currents are measured simultaneously and detecting the Earth Faults. The moment the Earth Fault crosses the Threshold Set value, an trip command is given by the relay to the trip circuit with a time elapse. The Earth Fault phenomenon is predominant in the Motor and Motor Control Centres, Hence protection against Earth Fault is necessary. Microcontroller Based Motor Protection Relay uses the proven Holmgreen technique for detection of Earth Fault in the Motor.

3. Unbalance Protection:Prok dv's make Microcontroller Based Motor Protection Relay measures and

monitors all the Three Phase Currents and extracts the Unbalance Currents presents in the Three Phase Motor circuit. The moment an Unbalance Current is detected and if it crosses more than the Set value, the relay is activated in tripping the circuit.

4.Locked Rotor Protection:Prok dv's make Microcontroller Based Motor Protection Relay detects Locked Rotor

condition i.e. Motor not withstanding over loads beyond 3times as per Thermal withstand time characteristics and this is predominantly observed in old unused and rewound Motors. In the Locked Rotor Condition if the Motor Current crosses 3times Im the relay is activated in tripping the circuit with a time elapse.

5. Under Current Protection:Prok dv's make Microcontroller Based Motor Protection Relay detects the Under

Current Fault in a situation that sudden load Throw-Off or Loss of load, resulting in dry run of Motor. During the sudden loss of load the Motor takes low Current i.e. Under Current and if this value crosses the Set value the relay trips the circuit with a time elapse.

6.Loss of Phase / Single Phasing:Prok dv's make Microcontroller Based Motor Protection Relay detects the Loss of

Phase / Single Phasing in a Motor circuit. Motor burnouts are predominant due to Single Phasing or Loss of Phase at the main source / HT side and Fuse failure at the Motor Circuit. The Single Phasing / Loss of Phase is sensed by the relay and trips the circuit with a time elapse.

7.Phase Reversal:Prok dv's make Microcontroller Based Motor Protection Relay monitors the Phase

Sequence Currents and detects the Phase reversal and trips the circuit with a time elapse.

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ISO 9001-2008Prok Devices Private Limited

SIMHADRI ,No.2930, 14 th Cross,Banashankari II nd Stage, Off K.R. Road,

Bengaluru-560070Karnataka,India

Tel:+91 80 43487777/26760718/26761719Fax:+91 80 26761720

For Marketing Information & Assistance

For Product Information & Technical Details

[email protected]@prokdvs.com

[email protected]

[email protected] Service Information

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YDIGITAL MICROCONTROLLER / MICROPROCESSOR BASED EARTH LEAKAGE RELAY (ELR) WITH CORE BALANCE CURRENT TRANSFORMER (CBCT / ZCT)→MPEL SERIES IEEE

Device Code-64

An ISO 9001 : 2008 Company MOTOR PROTECTION RELAY · An ISO 9001 : 2008 Company Microcontroller...

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