typical motor protection relay by SiemensFull description
pROTECCION MOTORDescrição completa
pROTECCION MOTOR
pROTECCION MOTORDescripción completa
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This presentation delt with Motor protection relay and it's setting creteria !Full description
This presentation delt with Motor protection relay and it's setting creteria !
Descripción: This presentation delt with Motor protection relay and it's setting creteria !
This presentation delt with Motor protection relay and it's setting creteria !Full description
microcontroller based protection of induction motor against voltage fluctuatuions
1.Three Phase Induction Motor Protection SystemFull description
Descripción: 1.Three Phase Induction Motor Protection System
Descripción: Advanced Protection
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Pulp protection operative dentistry
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“Electric Motor Protection”
Gunawan # 119452 Electrical/Maintenance
Agenda 1 Introduction 2 Motor Electric Failures 3 Relay Protection 4 Agenda 4
2
Agenda 1 Introduction 2 Motor Electric Failures 3 Relay Protection 4 Agenda 4
2
1 Introduction
1. Introduction Costs Associated with Motor Failures Costs Associated with Motor Failures Equipment downtime Loss of production Collateral equipment damage Equipment replacement Work in process damage Overtime for repair crews
1. Introduction Thermal Breakdown
Electric Motor Failures Failures causes Thermal Mechanical Environmental
Thermal Breakdo Breakdown wn
1. Introduction
2 Motor Electrical Failures
2. Motor Electrical failures
2. Motor electrical failures
Thermal breakdown causes Thermal Breakdown Over load Voltage variations Single Phasing Short Circuits
Over load Thermal Breakdown Process Cause (Excessive load) High Ambient Condition
Thermal Breakdown
Power supply ( Voltage / Current unbalance)
Voltage Voltage Variations Phase unbalance Thermal Breakdown
Phase loss (Single Phasing)
Low Voltage…..cause Demand for power is greater than the
supply Long cable runs Overloaded transformers
Thermal Breakdown
Distribution system
Low Voltage… Effect Reduced efficiency
Reduced life expectancy Increased temperatures Increased current Thermal Breakdown Lower torque
High Voltage… Effect Reduced efficiency Reduced power factor Increased power consumption Increased current
Thermal Breakdown
Increased temperature
Voltage Unbalance Percent voltage unbalance = 100 x Maximum voltage deviation from average voltage average voltage Thermal Breakdown
example: Assume voltages to a motor are 228 V to Phase A, 220V to Phase B and 236 V to Phase C. The average voltage is 228 V. The voltage unbalance is as follows: Voltage imbalance = 236-228 x 100 = 3.5% 228
Cause of Voltage Unbalance Unequal loading of a three phase system Unequal tap settings on transformers Loose connections in the power system Damaged starter contacts Thermal Breakdown Open delta transformer systems Storms (lightning) Poor regulation by utility
Voltage unbalance… Effect H or sepower Der ati ng
Thermal Breakdown
Single Phasing
Thermal Breakdown
Causes of Single Phasing Damaged motor starter contact Burned open overload relay Damaged switch or circuit breaker Blown fuse Thermal Breakdown
Open cable or bus on transformer
secondary Open motor winding Open transformer winding
Environmental breakdown causes Thermal Breakdown Moisture / Water Corrosion / Chemical Age
Thermal Breakdown
% Causes of Motor Failures Thermal Breakdown
Thermal Breakdown
Causes of Motor Failures Thermal Breakdown Bearing
Rotor Failures
Failures
5%
Overload
13%
30%
Thermal Breakdown
Contaminants 19%
Single Phasing
Misc 9%
Old Age 10%
14%
3 Relay Protection
3.1 Thermal overload relay Thermal Breakdown
Thermal over load function : Thermal Breakdown Over load
Application : Low Voltage motor 480 V
Thermal O/L curve Thermal Breakdown
Thermal Breakdown
Thermal O/L operation Thermal Breakdown
Thermal Breakdown
Thermal O/L connection Thermal Breakdown
Thermal Over load installation
Thermal Breakdown
3.2 Time Over current relay Thermal Breakdown
Time Over current Function Thermal Breakdown Over load Instantaneous Over current Stall time
Application : Medium Voltage motor 4160 V
Time Over current relay connection Thermal Breakdown
Time Over current relay operation Thermal Breakdown
3.3 Lodtrak IV relay Thermal Breakdown
Lodtrak IV Function Thermal Breakdown Over load Over Temperature Instantaneous Over current Phase Unbalance Stall time Under current Load jam
Motor Management Relay functions Thermal Breakdown Over load Over Temperature Instantaneous Over current Phase Unbalance Stall time Under current Load jam Under / Over Voltage Ground fault
Application : Medium Voltage motor 4160 V
Motor Management relay Connection Thermal n
3.5 Digital Relay Thermal n
M 60 Motor Relay functions Thermal Breakdown Over load Over Temperature Instantaneous Over current Phase Unbalance Stall time Under current Load jam Differential Under / Over Voltage Ground fault Application : High Voltage motor 13800 V