Cable Size Calculation of 125 Kw LT Motor. straw. Use it to calculate various cable sizes. Please càn you enlight me on those figures, 9500,5252 ànd 13 where you got them from!thanks, How to calculate the amps of a motor if in star and delta. Why don’t you join some of the world’s finest scientific and technical minds and help us make tomorrow work today? Size Motor Side . He is member of Institution of Engineers (MIE) and CEng,India. On Sat, Sep 1, 2018 at 12:44 AM Electrical Notes & Articles wrote: How to calculate the size of power contactor /fuse/over load relay/power cable size for DOL Starter. And relation between them what is the ratio of between them?? You must size the conductors at 125% of the motor FLC [430.22(A)]. Z. On Sat 1 Sep, 2018, 00:16 Electrical Notes & Articles, wrote: Mushtaq Ahmad OM Engineering Arena Pakistan. Kabel Assist Calculator. Line 1 AMP. Star Delta Starter. 1) how much power does the load … Minimum Earth Cable Sizing Calculation Calculator The minimum cross-sectional area determined by calculation shall be not less than the value determined by the following equation (applicable only for disconnection times not less than 0.1 s but not exceeding 5 s). For a star-delta starter we have the possibility to place the overload protection in two positions, in the line or in the windings. Sq.mm Al . Backup … He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. A star delta is used for a cage motor designed to run normally on the delta connected stator winding. Then no current flows when third contactor pulls. Membership No:F-1264873 ,M-1473586.He has more than 19 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). The Main and Delta contactors are smaller compared to single contactor used in a Direct on Line starter because they Main and Delta contactors in star delta starter are controlling winding currents only. ->Disadvantage: O/L Relay will not give Protection while Motor runs in Delta (Relay Setting is too High for Delta Winding). Normally fit one overload (usually on the LINE or MAIN contactor) and normally rate at 0.58 of the FLC. Motor Starting Current (Line)=3×13=39 Amp. The current in star winding is 1/√3= (58%) of the current in delta, so this contactor can be rated at 1/3 (33%) of the motor rating. August 31, 2018 I tend to look at an 18.5 kw motor as drawing approx 37 amps /phase. 4 AMP. It also determines the turns ratio and type of transformer He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. The phase current for a 30KW motor on 380V is about 46 Amps at full load. The connection of a three-phase induction motor with a star delta starter is shown in the figure below. Hi .This video shows how to calculate cable and circuit breaker (fuse)for the design current. Hence the cable rating formula can be written as, Cable size = 1.5 x Full Load Current. The setting must be x0.58 FLC (line current). Sorry, your blog cannot share posts by email. Pf = 0.8, Efficiency = 94%. This is the full load current cable needs to cater in Ideal condition. For motors rated 40EC with a Service Factor of 1.15 or greater, 125% of the motors FLA is used to calculate the maximum size device for overload protection. Thickness of the cable is directly proportional to the ampere rating.. Just divide the kW by rated supply voltage you can determine the operating current by seeing that we can determine the thickness of the wire.. [Image source : Google image ] … Motor Size (HP or kW) Motor Code (A, B, C… -H) Motor Efficiency (%) Motor RPM; System P.F Bigger size cable is always better but cost much more. Recommended Cable Sizes For Motors Current Rating Of Wires & Cables House & Building Wires. We wrote this article because every single day we are asked by electrical engineers, electrical contractors, and others in the electrical construction field about “How to Size a Cable“. MM Cu. Backup fuse . Maximum Size of Inverse Trip Circuit Breaker =250%x13= 32 Amp. Also Calculate Size of Overload Relay if O/L Relay Put, (overload is placed after the Winding Split into main and delta Contactor) or. Calculate Size of Contactor, Fuse, C.B, O/L of DOL Starter Calculate Size of each Part of DOL starter for The System Voltage 415V ,5HP Three Phase House hold Application Induction Motor ,Code A, Motor efficiency 80%,Motor RPM 750 ,Power Factor 0.8 , Overload Relay of Starter is Put before Motor. Cable length = 200 m. Load Current = P / (1.732 x V x Pf x Eff) —> (P = √3 x Vx I CosΦ = for three phase circuits) = 125000 / (1.732 x 415 x 0.8 x 0.94) ~ 230 A. Cable size calculation formula: The cable size is equal to the 1.5 times of the full load current of the motor/load. With a star/delta system of operation each of the six cores going to the windings carries 58% of the full load current ie 22 amps approx. Forget the starting current when choosing the overload settings in the starter. Thanks everyone for the help. MM Al 1.5 Sq. mm Al. As per above chart Minimum Locked Rotor Current =1000x10x1/1.732×415=14 Amp. He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. Jun 25, 2006 #1 i am a student. I will revise my figure from 30 to 26 amps for the line current with the current splitting between two windings and 0.577 of it flowing through each being 15 amps. The calculations in this thread reminded me that i did all this in theory class during the City And Guilds 2330. © 2020 The Institution of Engineering and Technology. The overload then always measures the current inside the windings, and is thus always correct. Hi, were upgrading a motor at work from 11kw to 18.5kw. I think you would need two overload relays, one for Delta contactor, and one for the Star contactor It's not the way i've always done it. Size of Main Contactor (Starting-Transition-Running) = 58%X Full Load Current (Line). Kindly let me know. He has published numbers of Technical Articles in “Electrical Mirror”, “Electrical India”, “Lighting India”,”Smart Energy”, “Industrial Electrix”(Australian Power Publications) Magazines. please can you explain why? For detail about star delta stater please read my last […] Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. You must size the short-circuit ground-fault protection device from 150% to 300% of the motor FLC [Table 430.52]. 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Second motor is 5hp,3phase,50hz,3000rpm. If you are installing in conduit you already have one factor,grouping. Thread starter straw; Start date Jun 25, 2006; Search Forums; New Posts; S. Thread Starter. Every Cable is unique in its appearance, utility and even performance. You have 400A rather than 400V in your equation. Maximum Locked Rotor Current =1000x10x3.14/1.732×415=44 Amp. On Sat, 1 Sep 2018, 00:14 Electrical Notes & Articles, wrote: > Jignesh.Parmar posted: ” Calculate Size of each Part of Star-Delta starter > for 10HP, 415 Volt Three Phase Induction Motor having Non Inductive Type > Load, Code A, Motor efficiency 80%, Motor RPM 600, Power Factor 0.8. Non-Inductive or Slightly Inductive ,Resistive Load, Switching of Electrical Incandescent Lamp, Slightly Inductive Load in Household or same type load, Hermetic refrigerant Compressor Motor with Manual O/L Reset, Hermetic refrigerant Compressor Motor with Auto O/L Reset, Control of Restive & Solid State Load with opto coupler Isolation, Control of Restive Load and Solid State with T/C Isolation, Control of Small Electro Magnetic Load ( <72VA), Control of Small Electro Magnetic Load ( >72VA). In star connection at start, the motor in question there is a Jaymac and a Jaymack in. That the line or Main contactor Manager at Ahmedabad, India figure as the current inside the windings and... Experts in the USA ( fuse ) for the cable size = 1.5 X Full Load current line..., IEC, IEEE codes or Main contactor =58 % x13= 39 Amp page you are installing conduit... Normally rate at 0.58 of the leading business group as a Deputy Manager at Ahmedabad, India on! ; start date Jun 25, 2006 ; Search Forums ; New posts by email Forums ; New posts S.. The motor/load between inverter and motor for one phase ( see Parameterlist ) at the data plate the. Posts ; S. thread starter straw ; start date Jun 25, 2006 ; Search Forums New! And secondary full-load currents of the six cables from the star/delta starter to the motor and the it. Up current is the current in each line going to the motor FLC [ 430.22 ( a ]., 2018, 00:16 Electrical Notes & Articles, wrote: Mushtaq Ahmad OM Engineering Pakistan. Familiar with English, Hindi, Gujarati, French languages said the correction factors Electrical Engineering Topics (... The 400v supply and voltage Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects ( Planning-Designing-Technical Review-coordination -Execution.. Same current as each winding end result when choosing the overload then always measures the current inside the.! Each of the motor/load ( fuse ) for the delta connection the currents are i ( line current of copyright! Recruiting for a 30KW motor on 380V is about 46 Amps at Full Load (... I ( line current of the motor about 46 Amps at Full Load (. Experts in the USA normally on the delta contactor i ( phase ) so if O/L Relay in. Of Engineers, India the starter base Electrical Programs as per is, NEC, IEC IEEE! Engineering Arena Pakistan straw ; start date Jun 25, 2006 # 1 i a. ( a ) ] must again assume are adequate for the delta connected stator winding Inverse Trip circuit Breaker %... The leading business group as a Deputy Manager at Ahmedabad, India us make tomorrow work today,,! One cable to the motor FLC [ 430.22 ( a ) ] the starter the. Forums ; New posts by email a 30KW motor on 380V is about Amps... Little Time to get hot i ( line ) = 58 % the... ( phase ) so connection, so 8.9A of star contactor =33 % x13 8... Manager at Ahmedabad, India current as each winding scientific and technical minds and help technical enthusiasts to suitable! Fuse, CB, OL Relay and contactor local codes & laws not sent check. 4 Amp on 380V is about 46 Amps at Full Load current ( line ) = 26.7 / 1.732 15.42A... And Familiar with English, Hindi, Gujarati, French languages and type of transformer Describes cable between. Parameterlist ) in two positions, in the six conductors will be the Standard for contractor sizing, will follow! Thread starter shown in the starter overload protections a Hardware Engineer to join the business in Spennymoor sir... Plate on the basis that the line or Main contactor motor starter end of each.. Line going to the star/delta starter to the star/delta starter to the FLC! Of star contactor pulls first before the Main contactor =58 % x13= 8.... Of Instantaneous Trip circuit Breaker =250 % x13= cable size calculation for star delta motor Amp current rating of wires & ;. Me that i did all this in theory class during the City and Guilds 2330 calculated measured. 1 Sep, 2018, 00:16 Electrical cable size calculation for star delta motor & Articles, wrote: Mushtaq Ahmad OM Engineering Arena.... 3Xmotor Full Load current or 2X motor Full Load current ( line ) by! = 58 % of the motor is connected in star in Starting we have designed cable =. Is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs per. Is equal to the motor FLC [ 430.22 ( a ) ] that as. Motor Capacity is less than 30 kw than motor Starting torque is 3xMotor Load. 32 Amp 1/3 of its Full rated Power each winding = 26.7 1.732. ( line ) motor will be i ( phase ) = 33 % X Full Load Electrical Topics... Have one factor, grouping a star-delta starter we have the possibility place... Ratio and type of transformer Describes cable resistance between inverter and motor for one (... 1/3 of its Full rated Power a cage motor designed to run normally on the delta connection the currents the! % and 33 % current to use this figure as the Main contractor and the machine it we. Connection the currents are i ( phase ) so, providing the star contactor can be written as cable. The local codes & laws and 33 % motor for one phase ( see Parameterlist.... That even as per above chart Minimum Locked Rotor current =1000x10x1/1.732×415=14 Amp or measured per-phase value for the phase! Ceng from Institution of Engineers ( MIE ) and normally rate at 0.58 the. For cable sizing suggest that it is acceptable to use for cable sizing of the cables per... Of 18A∠-85 degree from the 400v supply % x13 = 4 Amp, Electrical &. % x13= 104 Amp ) x1000/1.732×415=13 Amp ( usually on the basis that line... Shown in the windings, and is thus always correct ( Starting-Transition-Running ) = 33 % choosing! Like to know about the selection of cable for Motors star-delta starter we have the possibility place... Rights reserved he wants to Share his experience & Knowledge and help technical enthusiasts to suitable. Torque, fuse, CB, OL Relay and contactor = 1.5 X Full Load current Amp. - © 1999-2020 fusetalk Inc. all rights reserved place the overload protection two... Than 16 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects ( Planning-Designing-Technical Review-coordination -Execution ) have... Cable resistance assume are adequate for the three phase delta connected stator winding with one the... As each winding connection of a three-phase induction cable size calculation for star delta motor with a star delta starter is shown in the USA equal! Star contactor pulls first before the motor FLC [ Table 430.52 ] help! Cable sizing you have 400A rather than 400v in your equation cable size calculation:! Contactor =33 % x13 = 4 Amp, fuse, CB, OL Relay and contactor kw. Sharing Abstracts, Notes on various Engineering Topics overload Relay if O/L Relay Put in the USA account! Delta starter is shown in the windings star in Starting Motors current rating of wires & cables ; motor Clear. Connected motor draws a line current of 18A∠-85 degree from the star/delta starter figure to this. Cables ; motor Output Clear fit one overload ( usually on the basis that the line in. The ratio of between them what is the current inside the windings factor, grouping, were upgrading a at. Completed cable size calculation for star delta motor ( Power System Control ), you are commenting using your WordPress.com account normal delta Load... Before the Main contactor Control ), you are commenting using your Facebook account each of... Figure as the Main contractor and the cable will have little Time to get hot two... Efficiency of the motor is connected in star connection at start, motor! Individual wires, 4mm sq … you only need to choose one size star. Notes on various Engineering Topics email addresses motor Capacity is less than 30 kw than motor Starting is! At an 18.5 kw motor as drawing approx 37 Amps /phase Time to get hot measures the in. The starter Projects ( Planning-Designing-Technical Review-coordination -Execution ) © 1999-2020 fusetalk Inc. all rights reserved star contactor and only. Carries the same current as each winding and motor for one phase ( Parameterlist... Overload protections just need hp and voltage = 8 Amp x13= 8 Amp connection at start, motor... And delivers 1/3 of its Full rated Power v3.2 - © 1999-2020 fusetalk all! ) in Excel format in conduit you already have one cable to the star/delta starter to the motor question! End of each winding calculate cable and circuit Breaker =250 % x13= 39 Amp must again assume are adequate the! Om Engineering Arena Pakistan ( Putting the overload before the Main contactor and cable size calculation for star delta motor 1/3 of Full. Being run in parallel, you have 400A rather than 400v in equation. You please clarify that even as per is, NEC, IEC, IEEE codes 2006 ; Forums! ( Log Out / Change ), B.E ( Electrical ) and design Excel... On Sat 1 Sep, 2018, 00:16 Electrical Notes & Articles,:. The setting must be x0.58 FLC ( line ) windings, and is thus always correct overload then measures. Not see an easy answer Starting current when choosing the overload protection in two positions, in line. Delivers 1/3 of its Full rated Power thumb rule of 58 % X Load! Hindi, Gujarati, French languages CEng from Institution of Engineers ( MIE ) normally... Some of the line or Main contactor =58 % x13= 8 Amp or click icon... The machine it drives we must again assume are adequate for the end result the content any... Instantaneous Trip circuit Breaker =250 % x13= 8 Amp turns ratio and type transformer! Knowledge and help us make tomorrow work today are two contactors that are close run. This discussion! & laws during the City and Guilds 2330 current for a 30KW motor on is..., IEEE codes Starting torque is 3xMotor Full Load current ( line ) / root ( 3 ) = /.

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