mec sample engineering report

8/6/2019 Mec Sample Engineering Report

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ENGINEERING REPORT

XYZ Corporation

100 Anyplace Drive

Chicago, Illinois 60613

PERFORMED BY:

MIDWEST ELECTRICAL CONSULTANTS, INC

18055 UPLAND DRIVE

TINLEY PARK, ILLINOIS 60487

(708) 444-0001 fax: 444-0003

www.midwestelectrical.com.

POWER QUALITY TESTING & INSPECTIONS OF TRANE AIR

CONDITIONING COMPRESSOR(S) ELECTRICAL SERVICE

PROJECT: C822

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D.J. Sweeney Electric May 5, 2008

6813 Hopson Valley Drive

Woodridge, Illinois 60517

Re: Power quality testing & inspections of Trane compressor(s) electrical service

Attention: Mr. Timothy Sweeney,

Enclosed is the engineering report detailing the project thatwe recently completed

at the XYZ Corporation 100 Anyplace Drive Chicago, Illinois 60613. MEC is a full

service independent testing company and appreciates the opportunity to provide

your system review, inspection, power quality testing and engineering support

services.

Our mission is to provide an independent technical service to enhance the safety,

reliability and efficiency of electrical systems.

Thank you for the opportunity to provide this service. Please contact us if you

have any questions or wish to know more about our services.

Respectfully Submitted,

Douglas Christianson

Electrical Engineer

Cc: Mr. William W. Baird - XYZ Corporation

Cc: Mr. Robert Rogers - Advantage Electric

Cc: Mr. Timothy Fashing - Roberts Mechanical

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ENGINEERING REPORT

XYZ Corporation

100 Anyplace Drive


Power Quality Testing & Inspections of Trane Compressor(s) Electrical Service

SECTION 1 SCOPE; PURPOSE; PROCEDURE;APPRAISAL AND RECOMMENDATIONS

SECTION 2 POWER QUALITY MONITORING DATA(separate file)

SECTION 3 ADDITIONAL TESTING SUPPORT DATA(separate file)

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ENGINEERING REPORT

XYZ Corporation

Chicago, IL

Power Quality Testing & Inspections of Trane Compressor(s) Electrical Service

SECTION I

SCOPE:On April 29, 2008, Midwest Electrical Consultants, Inc. (MEC) provided powerquality testing and inspections at the XYZ Corporation 100 Anyplace DriveChicago, Illinois 60613 twin Trane Heli Rotor RTWA070AY001C3DOWN airconditioning compressor(s) electrical service. All testing and inspections wereperformed according to the manufacturer and International Electrical TestingAssociation (NETA) recommendations.

Detailed inspection notes and observations documented during the execution ofthis project are contained in the additional support test data (separate file) test datasection (separate file) and recommendation section of this engineering report. Thissummary contains data for the completed inspections.

PURPOSE:The purpose of this inspection and subsequent report is to provide informationrelative to the operation of the Trane air conditioning compressor(s) electricalservice and equipment located in the XYZ Corporation building. This report isintended to assist you in planning for upgrades or changes to the electrical system,increase the safety of the electrical system through inspections and provide

recommendations for future equipment usage at the facility. It is not intended toimply that other equipment issues or recommendations not covered in this scopemay or may not exist at the time of the inspection.

PROCEDURE:All inspections and recommendations are performed in accordance with MECs

standard procedures including, but not limited to, selected specifications from thefollowing: International Electrical Testing Association (NETA), National ElectricalCode (NEC), National Fire Protection Association 70B-Electrical EquipmentMaintenance (NFPA 70B), Institute of Electrical and Electronic Engineers (IEEE),American Society for Testing and Materials (ASTM), National Electrical

Manufacturer's Association (NEMA), Occupational Safety and HealthAdministration (OSHA), unless otherwise noted.

INSPECTIONS: The electrical distribution equipment associated with the Trane airconditioning compressor(s) electrical service was inspected for installationaccording to standard NEC practices, appropriate sizing and cleanliness.Equipment inspections included the grounding system and ground systembonding.

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ENGINEERING REPORT

XYZ Corporation

100 Anyplace Drive


Power Quality Testing & Inspections of Trane Compressor(s) Electrical service

APPRAISAL AND RECOMMENDATIONS: The Trane Heli Rotor airconditioning compressor(s) system was found to be installed according tomanufacture and electrical standard practices. A digital power recorder wasinstalled at the local compressor(s) disconnect and allowed to monitorduring multiple starts of the unit.

Compressor(s) disconnect location (240 volt compressor)

1) Utility/system voltage levels were found to be imbalanced during themonitoring period (approximately 4.7%). Average voltage levels werefound to be 236 volts on A-B, 247 volts on B-C, 245 volts on C-A.Voltage magnitudes were consistent during compressor(s) starts,indicating the system is not overloaded. MEC recommends review ofthe electrical service voltage levels with the utility to determine if thevoltage imbalance is caused by service entrance equipment(transformer(s), cabling, connectors, etc.) or utility distribution (grid)system voltage deviation caused perhaps by loading or other issues.

2) Compressor(s) motor currents (amps) were found to be severely

imbalanced at the main disconnect panel. Average current for eachphase was 28.6 amps- Phase A, 46.3 amps - Phase B, and 54.7amps - Phase C per motor. Load imbalances greater than 4% (91%during the monitoring period) would typically indicate an internalmotor problem. Further investigation indicates a different problemexists at this location. Motor leads were moved to accommodateproper rotation at the compressor(s) control board. Upon restart ofthe compressor(s) with exchanged phasing, the voltage and currentimbalances followed the same phases to different motor windings(See two attached files, section 2 power quality monitoring data, andsection 3 additional testing support data). Investigation of the

electrical service voltage levels is recommended.

3) Overhead transformers providing service for the facility wereinspected for proper installation and operation. Inspection of thetransformers indicate that transformer bank A (East) is currently orwas previously overloaded. Localized discoloration and corrosion oftransformer tank components (secondary bushings) generallyindicates an overloaded condition. MEC recommends investigationof the electrical transformers by utility personnel.

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4) Voltage magnitudes at the utility transformer secondary locationswere found to be identical to the voltage levels measured at thecompressor(s) disconnect location. Due to similar voltage readings,we recommend a review of the utility distribution system.

5) We recommend that an adequately sized dedicated power source(e.g. diesel or natural gas generator) be used to support thecompressor(s) load to confirm the existing utility source issue, andrun the equipment until the problem is corrected.

APPRAISAL AND RECOMMENDATIONS: General

1) MEC recommends REGULAR ELECTRICAL INSPECTIONS, CLEANINGAND TESTING of electrical equipment to assist in identifying deterioratedinsulation, abnormal operating temperatures and malfunctioning protectivedevices prior to equipment failure.

2) All electrical protective equipment including ground fault relays, circuitbreakers and fused disconnects should be tested, exercised and lubricatedon a regular basis. Mechanical equipment may not operate properly whencalled upon if regular maintenance is neglected.

3) New OSHA requirements have been issued regarding Arc Flashrecommendations and personnel safety. New Arc Flash requirements willrequire all facilities (industrial, commercial, institutional) to displayinformation about the arc flash availability at each panel, switch or breakerwhere the equipment is accessible by maintenance/site personnel. The arcflash information on the panel fronts will indicate the level of clothing and

level of training required to open and maintain the equipment within thepanel or switchboard. See note #2 above; protective equipment which doesnot operate within specified tolerances (tripping time or magnitudes) willinvalidate any Arc flash study results.

4) Transient voltage surge suppressor (tvss) units were not evident on any ofthe electrical distribution equipment we inspected or tested at. Werecommend the installation of a properly sized high quality tvss unit on themain electrical switchboard. The main tvss unit will mitigate or remove anyand all transient voltage spike and surge disturbances caused externally tothe building (lightning, electrical storms, downed power lines, utility

company switching, high winds, tree branches, ice/snow on utility lines anddistribution equipment, other utility customers in close proximity, etc.) Alsosecondary sub panel or final point of protection tvss units should be installedon or at ALL critical equipment especially electronic loads (fire alarm,security, telephone, roof hvac, elevators, etc.) to address or clamp internallygenerated switching transient/surge events created by all electrical andelectronic equipment being turned off and on or duty cycled within thebuilding. The secondary level of protection would also act as back upprotection should the primary tvss unit become damaged or sacrificial.

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All plug in or corded electronic equipment (pcs, monitors, printers, modems,Fax, etc.) should be plugged into a quality corded power strip tvss unit. Iwould direct your attention to the documentation I left with you for a moredetailed explanation on this subject. We would be happy to provide anyengineering assistance in the selection or installation of any of the transientvoltage surge suppressors outlined in this report.

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1

Power Analysis Collected Data Summary Section 2

Introduction

This is a summary of the power conditions at the XYZ Coporation 100 Anyplace DriveChicago, Illinois 60613 as recorded at location delta setup#2 Trane Heli Rotor air

conditioning compressor(s) service disconnect. Data at this location was collected from

04/29/08 11:16:18 through 04/29/08 11:31:18.

This summary is composed of:

The Voltage Current and Frequency, (VIF), section. This section contains summariesfor each of these parameters during the monitor interval.

The Harmonics section. This contains the voltage and current harmonic, andharmonic distortion summaries acquired during the monitor interval.

The Power section. This contains the VA, VARS., Watts, and Power factor acquiredduring the monitor interval. For multiphase locations, voltage and current imbalanceare also included.

Site and Location Information

Site Information

Name XYZ CoporationAccount Number

Date and Time 04/29/08 09:24:20Phone NumberContact

MemoProblem DescriptionDate First noticed 04/29/08Problem Frequency UnknownHow problem exhibits itself UnknownProblem Cost

Location Information

Name delta setup #2 Trane compressor(s) service disconnectPower Type Three phase delta

Feed Phase Unknown

PhoneDate and Time 04/29/08 11:06:38 Nominal Voltage 240 Volts Nominal Frequency 60 Hz


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2

Report Parameters

This report was prepared on 4/29/2008 by Midwest Electrical Consultants, Inc. 18055

Upland Drive Tinley Park, Illinois 60487 (708) 444-0001 fax: 444-0003www.midwestelectrical.com The following limits were used in analyzing the results.

Maximum Phase Voltage. 254 voltsMinimum Phase Voltage. 208 voltsMaximum Impulse Voltage. 500 volts

Maximum. Waveshape Voltage. 10 volts

Maximum Frequency Deviation. .02 HzMinimum Power Factor. .85

Maximum Voltage T.H.D. 5 %

Maximum Current T.H.D 20 %Maximum Voltage Imbalance. 2 %

Maximum Current Imbalance. 5 %

Any values outside these limits are noted in the report. Values within the limits areconsidered to be within a safe operating range. These limits have been programmed by

Midwest Electrical Consultants, Inc.


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3

Voltage, Current and Frequency Summaries

Voltage, Current and Frequency measurements for XYZ Coporation:delta setup#2 from

04/29/08 11:16:18 through 04/29/08 11:31:18.

RMS. Voltages Value Date and TimePhase A minimum 229.2V Apr 29 2008 11:21:22Phase A average 235.8VPhase A maximum 240.4V Apr 29 2008 11:21:22

Phase B minimum 240.3V Apr 29 2008 11:21:22Phase B average 247.2VPhase B maximum 255.3V Apr 29 2008 11:21:22

Phase C minimum 239.5V Apr 29 2008 11:19:48Phase C average 245.1VPhase C maximum 252.2V Apr 29 2008 11:21:22

RMS. Currents Value Date and TimePhase A minimum 549.3mA Apr 29 2008 11:21:41Phase A average 11.93APhase A maximum 380.3A Apr 29 2008 11:19:49

Phase B minimum 3.662A Apr 29 2008 11:21:52Phase B average 20.53APhase B maximum 487.2A Apr 29 2008 11:22:18

Phase C minimum 1.098A Apr 29 2008 11:18:23Phase C average 23.14APhase C maximum 343.5A Apr 29 2008 11:22:18

Frequency Value Date and TimePhase A minimum 42.12Hz Apr 29 2008 11:21:22Phase A average 43.61HzPhase A maximum 44.69Hz Apr 29 2008 11:16:42

Phase B minimum 42.12Hz Apr 29 2008 11:21:22Phase B average 43.61HzPhase B maximum 44.69Hz Apr 29 2008 11:16:42

Phase C minimum 42.12Hz Apr 29 2008 11:21:22Phase C average 43.61HzPhase C maximum 44.69Hz Apr 29 2008 11:16:42


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RMS. Voltage Summaries for XYZ Coporation:delta setup#2.

Phase A Voltage Summary.

Min. 229.2V Apr 29 2008 11:21:22Avg. 235.8VMax. 240.4V Apr 29 2008 11:21:22


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Phase B Voltage Summary.



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Phase C Voltage Summary.



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RMS. Current Summaries for XYZ Coporation:delta setup#2.

Phase A Current Summary.

Min. 549.3mA Apr 29 2008 11:21:41Avg. 11.93AMax. 380.3A Apr 29 2008 11:19:49


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Phase B Current Summary.

Min. 3.662A Apr 29 2008 11:21:52Avg. 20.53AMax. 487.2A Apr 29 2008 11:22:18


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Phase C Current Summary.

Min. 1.098A Apr 29 2008 11:18:23Avg. 23.14AMax. 343.5A Apr 29 2008 11:22:18


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Voltage and Current Distortion Summaries

Voltage and Current harmonic distortion measurements for XYZ Coporation:delta

setup#2 from 04/29/08 11:16:18 through 04/29/08 11:31:18.

Voltage Distortion Value Date and TimePhase A minimum 2.83% Apr 29 2008 11:23:55Phase A average 3.388%Phase A maximum 5.68% Apr 29 2008 11:21:22

Phase B minimum 2.55% Apr 29 2008 11:21:00Phase B average 3.039%Phase B maximum 4.83% Apr 29 2008 11:21:22

Phase C minimum 2.95% Apr 29 2008 11:19:15Phase C average 3.523%Phase C maximum 5.38% Apr 29 2008 11:21:22

Current Distortion Value Date and TimePhase A minimum 4.81% Apr 29 2008 11:19:48

Phase A average 34.15%Phase A maximum 67.92% Apr 29 2008 11:17:47

Phase B minimum 4.06% Apr 29 2008 11:19:48Phase B average 121.5%Phase B maximum 308.2% Apr 29 2008 11:17:42

Phase C minimum 3.8% Apr 29 2008 11:19:48Phase C average 30.55%Phase C maximum 143.9% Apr 29 2008 11:16:43

Voltage Flicker Value Date and TimePhase A minimum N/APhase A average N/A

Phase A maximum N/APhase B minimum N/APhase B average N/APhase B maximum N/A

Phase C minimum N/APhase C average N/APhase C maximum N/A


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Voltage T.H.D. Summaries for XYZ Coporation:delta setup#2 .

Phase A Voltage Distortion.

Min. 2.83% Apr 29 2008 11:23:55Avg. 3.388%Max. 5.68% Apr 29 2008 11:21:22


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Phase B Voltage Distortion.



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Phase C Voltage Distortion.



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Current T.H.D. Summaries for XYZ Coporation:delta setup#2.

Phase A Current Distortion.



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Phase B Current Distortion.



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Phase C Current Distortion.



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Power Summaries

Power measurements for XYZ Coporation:delta setup#2 from 04/29/08 11:16:18 through

04/29/08 11:31:18.

Imbalance Value Date and TimeMinimum Voltage Imbalance 2.68% Apr 29 2008 11:23:30

Average Voltage Imbalance 2.840%

Maximum Voltage Imbalance 3.37% Apr 29 2008 11:21:22

Minimum Current Imbalance 2.17% Apr 29 2008 11:22:17

Average Current Imbalance 48.58%

Maximum Current Imbalance 154.8% Apr 29 2008 11:16:43

VA Power Value Date and TimePhase A minimum 97.69VA Apr 29 2008 11:21:41Phase A average 1.660kVAPhase A maximum 51.31kVA Apr 29 2008 11:19:49

Phase B minimum 512.7VA Apr 29 2008 11:21:52Phase B average 2.868kVAPhase B maximum 65.88kVA Apr 29 2008 11:22:18

Phase C minimum 179.5VA Apr 29 2008 11:21:48Phase C average 3.346kVAPhase C maximum 48.39kVA Apr 29 2008 11:22:18

Total minimum 925.0VA Apr 29 2008 11:21:48Total average 7.874kVATotal maximum 77.57kVA Apr 29 2008 11:19:48

VARS Power Value Date and TimePhase A minimum -3.482kVAR Apr 29 2008 11:19:49Phase A average 1.457kVARPhase A maximum 49.95kVAR Apr 29 2008 11:22:18

Phase B minimum -4.439kVAR Apr 29 2008 11:22:18Phase B average 1.475kVARPhase B maximum 26.88kVAR Apr 29 2008 11:22:17

Phase C minimum -13.10kVAR Apr 29 2008 11:16:43Phase C average 2.845kVARPhase C maximum 46.66kVAR Apr 29 2008 11:22:18

Total minimum -3.962kVAR Apr 29 2008 11:16:43Total average 5.777kVARTotal maximum 68.11kVAR Apr 29 2008 11:19:48


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Watts Power Value Date and TimePhase A minimum -11.75kW Apr 29 2008 11:19:49Phase A average 737.8WPhase A maximum 15.35kW Apr 29 2008 11:22:18

Phase B minimum -97.99W Apr 29 2008 11:21:22Phase B average 2.118kW

Phase B maximum 19.78kW Apr 29 2008 11:22:18Phase C minimum -3.091kW Apr 29 2008 11:21:22Phase C average 1.706kWPhase C maximum 20.38kW Apr 29 2008 11:19:49

Total minimum -98.06W Apr 29 2008 11:21:22Total average 4.563kWTotal maximum 36.85kW Apr 29 2008 11:19:48

Demand Power Value Date and TimePhase A minimum 645.8W Apr 29 2008 11:16:42Phase A average 707.4WPhase A maximum 788.7W Apr 29 2008 11:21:18

Phase B minimum 1.806kW Apr 29 2008 11:16:42Phase B average 1.982kWPhase B maximum 2.214kW Apr 29 2008 11:21:18

Phase C minimum 1.434kW Apr 29 2008 11:16:42Phase C average 1.570kWPhase C maximum 1.750kW Apr 29 2008 11:21:18

Total minimum 3.887kW Apr 29 2008 11:16:42Total average 4.260kWTotal maximum 4.753kW Apr 29 2008 11:21:18

Power Factor Value Date and TimePhase A minimum 0.968 Lead Apr 29 2008 11:19:49

Phase A average 0.271 LagPhase A maximum 0.000 Lag Apr 29 2008 11:21:22

Phase B minimum 0.000 Lead Apr 29 2008 11:21:22Phase B average 0.608 LagPhase B maximum 0.004 Lag Apr 29 2008 11:17:46

Phase C minimum 0.003 Lead Apr 29 2008 11:16:43Phase C average 0.344 LagPhase C maximum 0.000 Lag Apr 29 2008 11:16:43

Total minimum 0.861 Apr 29 2008 11:22:18Total average 0.270Total maximum 0 Apr 29 2008 11:21:23


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Voltage and Current Imbalance Summaries for XYZ Coporation:delta setup#2.

Minimum Voltage Imbalance 2.68% Apr 29 2008 11:23:30

Average Voltage Imbalance 2.840%

Maximum Voltage Imbalance 3.37% Apr 29 2008 11:21:22


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Minimum Current Imbalance 2.17% Apr 29 2008 11:22:17

Average Current Imbalance 48.58%

Maximum Current Imbalance 154.8% Apr 29 2008 11:16:43


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VA Power Summaries for XYZ Coporation:delta setup#2.

Phase A VA Summary.

Min. 97.69VA Apr 29 2008 11:21:41

Avg. 1.660kVA

Max. 51.31kVA Apr 29 2008 11:19:49


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Phase B VA Summary.

Min. 512.7VA Apr 29 2008 11:21:52

Avg. 2.868kVA

Max. 65.88kVA Apr 29 2008 11:22:18


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Phase C VA Summary.

Min. 179.5VA Apr 29 2008 11:21:48

Avg. 3.346kVA

Max. 48.39kVA Apr 29 2008 11:22:18


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Total VA Summary.

Min. 925.0VA Apr 29 2008 11:21:48

Avg. 7.874kVA

Max. 77.57kVA Apr 29 2008 11:19:48


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VARS Power Summaries for XYZ Coporation:delta setup#2.

Phase A VARS Summary.

Min. -3.482kVAR Apr 29 2008 11:19:49

Avg. 1.457kVAR

Max. 49.95kVAR Apr 29 2008 11:22:18


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Phase B VARS. Summary.

Min. -4.439kVAR Apr 29 2008 11:22:18

Avg. 1.475kVAR

Max. 26.88kVAR Apr 29 2008 11:22:17


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Phase C VARS. Summary.

Min. -13.10kVAR Apr 29 2008 11:16:43

Avg. 2.845kVAR

Max. 46.66kVAR Apr 29 2008 11:22:18


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Total VARS Summary.

Min. -3.962kVAR Apr 29 2008 11:16:43

Avg. 5.777kVAR

Max. 68.11kVAR Apr 29 2008 11:19:48


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WATTS Power Summaries for XYZ Coporation:delta setup#2.

Phase A Watts Summary.

Min. -11.75kW Apr 29 2008 11:19:49Avg. 737.8W

Max. 15.35kW Apr 29 2008 11:22:18


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Phase C Watts. Summary.

Min. -3.091kW Apr 29 2008 11:21:22

Avg. 1.706kW

Max. 20.38kW Apr 29 2008 11:19:49


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Total Watts Summary.

Min. -98.06W Apr 29 2008 11:21:22

Avg. 4.563kW

Max. 36.85kW Apr 29 2008 11:19:48


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Power Factor Summaries for XYZ Coporation:delta setup#2.

Phase A Power Factor Summary.

Min. 0.968 Lead Apr 29 2008 11:19:49

Avg. 0.271 Lag

Max. 0.000 Lag Apr 29 2008 11:21:22


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Phase C Power Factor. Summary.

Min. 0.003 Lead Apr 29 2008 11:16:43

Avg. 0.344 Lag

Max. 0.000 Lag Apr 29 2008 11:16:43


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Total Power Factor Summary.

Min. 0.861 Apr 29 2008 11:22:18

Avg. 0.270

Max. 0 Apr 29 2008 11:21:23


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MIDWEST ELECTRICAL CONSULTANTS, INC.

18055 UPLAND DRIVE

TINLEY PARK, ILLINOIS 60487

(708) 444-0001 fax: 444-0003

www.midwestelectrical.com

SECTION 3

Trane Heli Rotor compressor motor power supply testing :

Tests performed during the monitoring period at the XYZ Coporation 100 Anyplace

Drive Chicago, Illinois 60613, consisted of rotation of the phases to test the

compressor(s) equipment for problems. Amperage readings are taken on eachphase, then the phases are rotated and a second set of amperage readings are taken.

Comparing the two sets of readings indicates if the problem is located in the motor

or power supply system. The following example in figures 1 and 2 illustrates the

procedure per motor:

Figure 1

Page2

Step 1:Measure all three legs

A phase - 28.6 amps

B phase - 46.3 ampsC phase - 54.7 amps


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Figure 2

Step 3:Measure amperages again

C phase - 54.7 ampsA phase - 28.6 amps

B phase - 46.3 amps

Notice that the amperages rotated with the wires. This indicates

the problem lies within the utility electrical supply to the facility,

had the amperages remained with the motor windings when thewires were rotated, the problem would have been in the motor

windings.

mec sample engineering report

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