Technical Specifications for Portable 3-Ø Power Analyzer

Transcription

1 Technical Specifications for Portable 3-Ø Power Analyzer SCOPE: This specification covers the general specifications of 3-phase power analyzer that can be used to measure the no load and full load losses of distribution transformers ranging from 5 to 300 KVA rating with the reasonable accuracy as described. The desired functions are as described therein. The intention is not to describe every parameters and unless or otherwise explicitly described, bidder is abide to supply instruments as expected by the UGVCL. All rights are reserved under all tendering conditions to review, change, add or delete any parameters if it is found necessary by the UGVCL without assigning any reasons thereof. GENERAL SPECIFICATIONS: The Power Analyzer shall be portable that can be used for measurement of No load and Full load losses, current, voltage, PF & Peak Amps of 3-phase, 11/0.433 KV, Distribution Transformers ranging from 5 to 300 KVA capacity, having following general capability. a) 3 Ø power analyzer having high accuracy (±0.2% Min.) suitable for accurate measurement at low PF in the bandwidth of 45 to 65 Hz with ranges up to 600 V true RMS, 0.25Amp to 20 Amp. true RMS. It should be shock proof and vermin proof. b) USB/RS232 Data cable for connection between computer and power analyzer to download test data from Power Analyzer to Base computer. c) Interface Software for establishing connection/ data transfer/ data monitoring and control of power analyzer with base computer. It should be possible to control the Power Analyzer through PC with this software. It is necessary to ensure that original test results are imported and saved in the original form in a secured manner without any possibility for alteration. d) Display should have 7 segments LED for long distance view, three separate displays for all three phases and shall be controllable for a selected quantity of voltage, current, power or phases. It should also give clear indication for the type of wiring for which it is operating. Display updating interval shall be 0.1/0.25/0.5/1/2/5 Seconds for LCD display with hold function. It shall also have a Max. hold function facility to hold maximum values of V, I, VA, W, VAR, Vpk and Apk. Averaging function employed shall be Moving average or exponential average type with 8,16, 32 or 64 attenuation constant/ average set. e) Sufficient memory for data of at-least 200 test samples shall be in-built in the instrument supplied. f) Must be compliant to safety standards, Emission standards and Immunity standards as mentioned in the general specifications. g) Calibration test certificate for test carried out at ERDA are to be supplied with instrument. The detailed specification for the Power Analyzer shall be as follows: Page 1 of 9 Pages

2 GENERAL SPECIFICATION: Warm-up time Approx 30 minutes Operating temperature 5 to 40 o C Operating humidity 20 to 75% RH (No condensation) Storage temperature 25 to 60 o C (No condensation) Insulation resistance Insulation withstand voltage Power Supply Consumed power Size Weight Safety Standards Emission Immunity CALCULATION FUNCTIONS: 50 MΩ or higher at 500V DC across all of the following areas: -Voltage/current input terminals (ganged) to case -Voltage input terminal to Current input terminal -Voltage/current input terminals (ganged) to each element -Voltage/current input terminals (ganged) to power plug -Case to power supply 3500V for one minute at 50 Hz across all of the following areas: -Voltage/current input terminals (ganged) to case -Voltage input terminal to Current input terminal -Voltage/current input terminals (ganged) to each element -Voltage/current input terminals (ganged) to power plug -1200V for one minute at 50Hz across case & power plug V / 50 Hz 60 VA maximum 220 x 140 x 380 mm (WHD) or less, excluding projection Less than 5 Kg. Must be Compliant to Indian Standards or International standards like: Overvoltage category (installation category) II Pollution Degree 2 Shall comply IS or relevant International Standards. Shall comply IS or relevant International Standards. Singlephase 3- wire Three-phase 3-wire(2 voltages, 2 currents) Three-phase 3-wire(3 voltages, 3 currents) Voltage V (V1 + V3)/2 (V1 + V2 + V3)/3 Current A (A1 + A3)/2 (A1 + A2 + A3)/3 Three-phase 4- wire Active power W W1 + W3 W1 + W2 + W3 Reactive power var, var Apparent power VA, VA Power factor PF, PF Phase angle deg, deg vari = sqrt (VA 2 - W 2 ) VAi = Vi Ai Pfi = Wi/VAi degi =cos -1 (Wi/VAi) var1 + var3 VA1 + VA3 W/ VA cos -1 ( W/ VA) ( 3/2) x (VA1 + VA3) (1/ 3) x (VA1 + VA2 + VA3) var1 + var2 + var3 VA1 + VA2 + VA3 Page 2 of 9 Pages

3 INPUT SPECIFICATIONS: Parameter Voltage Current Input type Rated values: Crest factor 3 Measuring instrument loss (Input resistance) Maximum instantaneous allowed input (1 cycle, 20 MS duration) Maximum instantaneous allowed input (1 sec duration ) Maximum continuous allowed input Maximum continuous common mode voltage (with 50 Hz input) Common mode rejection ratio (CMRR) : 600 Vrms across input terminal and case Input terminal type A / D converter Range switching Auto range function Measurement mode switching Floating input. Resistance voltage divider Floating input. Shut input system 15/30/60/150/300/600 V Direct input 0.5/1/2/5/10/20 A Input resistance : Direct input : More than. 1.5 M ohm Approx. 6 m ohm & Input capacitance : Approx. 0.1 µh More than 12 pf Peak voltage of 2.8 KV or RMS value of 2.0 KV whichever is less Maximum instantaneous allowed input (1 sec duration ) Peak voltage of 2.0 KV or RMS value of 1.5 KV, whichever is less Amp peak current of 450 Amp or RMS value of 300 Amp whichever is less Amp peak current of 150 Amp or RMS value of 40 Amp whichever is less Amp peak current of 100 Amp or RMS value of 30 Amp whichever is less 600 V RMS (with output connector protective cover) CAT II / 400 Vrms (without output connector protective cover) CAT II For 50 Hz, -80 db or higher with voltage input terminal shorted and current input terminal open and external input terminal shorted. Plug in terminal (safety terminal) Direct input; large binding post. External input : BNC connector (insulation type) Simultaneous conversion of voltage & current inputs. Resolution of min. 16 bits. Having conversion speed approx. 20 µs (51 khz ) Range can be set manually, automatically or through online controls. Range raising; when the measurement exceeds 130% of the rating, or when the peak value exceeds apprx. 300% of the rating. Range lowering: when a measurement falls to 30% or less of the rating, and the peak value falls appx. 300%, or less of the rating for the lower range. Any of the following: Selected manually or through online controls; RMS, true RMS value measurement for both voltage and current. V mean; calibration of average value rectified RMS value for voltage, true RMS value for current. DC; simple average for both voltage and current. Page 3 of 9 Pages

4 MEASUREMENT FUNCTIONS: Parameter System Frequency Range Crest Factor Accuracy : (3 Months after calibration) Temperature: 23±5 C Humidity: 30-75% RH Input waveform: Sine wave PF cosj= 1 Common mode voltage: 0V DC Frequency Filter: ON at 200 Hz or less Scaling: OFF Display Digits: 5 After CAL executed: crest Factor 3 Voltage / Current / Active Power Digital sampling : sum of averages method DC, and 0.5 Hz to 100 khz 3 or 6 (at rated input) DC: 0.5 Hz f < 45 Hz: 45 Hz f 66 Hz: 66 Hz < f 1 khz: 1 khz < f 10 khz: 10 khz < f 100 khz: For Voltage / Current ±(0.2% or rdg + 0.2% of rng)* ±(0.1% of rdg + 0.2% of rng) ±(0.1% of rdg + 0.1% of rng) ±(0.1% of rdg + 0.2% of rng) ±((0.07 f)% of rdg + 0.3% of rng) ±(0.5% of rdg + 0.5% of rng) ±((0.04 (f-10))% of rdg * ±10 μa to the current DC accuracy allowed. For Active Power DC: 0.5 Hz f < 45 Hz: 45 Hz f 66 Hz: 66 Hz < f 1 khz: 1 khz < f 10 khz: 10 khz < f 100 khz: ±(0.3% or rdg + 0.2% of rng)* ±(0.3% of rdg + 0.2% of rng) ±(0.1% of rdg + 0.1% of rng) ±(0.2% of rdg + 0.2% of rng) ±(0.1% of rdg + 0.3% of rng) ±((0.067 (f-1))% of rdg) ±(0.5% of rdg + 0.5% of rng) ±((0.09 (f-10))% of rdg Power factor effect Effective input range Temperature coefficient Display updating intervals * ±10 μa voltage reading to the power DC accuracy allowed. For Active Power For cosϕ = 0 45 Hz f 66 Hz: ±0.2% of VA (VA is a reading value of apparent power) Reference data (up to 100 khz): ±(( f)% of VA) Indicated value tolerance for 0 < cos ϕ < 1 Add (tanj ϕ (effect when cosj = 0)% of power reading to the above power accuracy. Note: ϕ is the phase angle between voltage and 1 current. -130% of voltage/current range rating (for accuracy at %, reading tolerance of 0.5 to the above accuracy is allowed) ±0.03% of range/ C at 5-18 C and C 0.1/0.25/0.5/1/2/5 Seconds Page 4 of 9 Pages

5 Lead / Lag Detecting Lead/lag is detected correctly when phase difference equal to or greater than ±5 with both voltage and current inputs as sine waves equal to or greater than 50% of rated range - value, and the frequency is between 20 Hz to 2 khz. Frequency Measurements: Measurement inputs: V1, V2, V3, A1, A2, or A3 (select one) Measurement system: Reciprocal system Measurement frequency ranges 100 ms: 25 Hz f 100 khz 250 ms: 10 Hz f 100 khz 500 ms: 5 Hz f 100 khz 1 sec: 2.5 Hz f 100 khz 2.5 sec: 1.5 Hz f 50 khz 5 sec: 0.5 Hz f 20 khz Accuracy (1 year): ±(0.06% of rdg) Conditions: Input equal to at least 30% of voltage/current rated range. Frequency filter function ON at 200 Hz and below. Crest Factor The crest factor is the ratio of the waveform peak value and the RMS value. Crest factor (CF, peak factor) = waveform peak / RMS value About the measurable crest factor of our power measuring instruments, please refer to the following equation. Crest factor (CF) = {measuring range x CF setting (3 or 6)}/ measured value (RMS) However, the peak value of the measured signal must be less than or equal to the continuous maximum allowed input. The crest factor on a power meter is specified by how many times peak input value is allowed relative to rated input value. Therefore, even if some measured signals exist whose crest factors are larger than the specifications of the instrument (the crest factor standard at the rated input), you can measure signals having crest factors larger than the specifications by setting a measurement range that is large relative to the measured signal. For example, even if you set CF = 3, CF5 or higher measurements are possible if the measured value (RMS) is 60% or less than the measuring range. Also, for a setting of CF = 3, measurements of CF = 300 are possible with the minimum effective input (1% of measuring range). Page 5 of 9 Pages

6 IMPORTANT: It is not the intent to specify completely herein all the details of the design and construction of equipment. However the equipment shall conform in all respects to high standards of engineering, design and workmanship and shall be capable of performing in continuous commercial operation up to the Bidder s guarantee, in a manner acceptable to the purchaser, who will interpret the meanings of specification and shall have the power to reject any equipment which, in his judgment, is not in accordance therewith. The offered equipment shall be complete with all components necessary for their effective and trouble free operation. Such, components shall be deemed to be within the scope of Bidder s supply irrespective of whether those are specifically brought out in this specification and / or the commercial order or not. Page 6 of 9 Pages

7 Technical specification MICRO OHM METER SCOPE Micro ohm meter that is capable to measure winding resistance of transformer up to the capacity of 200 KVA. The instrument shall be suitable for outdoor use and portable having 0.05% accuracy at Ambient temperature of 45 Degree. TECHNICAL REQUIREMENTS: Meter shall 4 ½ Digit led DISPLAY Meter shall measure the resistance from 2 m ohm to 20 ohm at current not less that 10mA with accuracy of 0.05%. The measurement shall be made by true 4-Wire resistance measurement technique having two current and two potential terminals to eliminate lead resistance error. 3-PHASE VARIAC Scope For measurement of no-load and full load losses of the transformer, the transformer is to be supplied specified voltage and currents as per the standard transformer rating. This variac (auto transformer) will be used to supply controlled power input as per the specified test condition. TECHNICAL REQUIREMENTS: Current rage shall be 20A Max Voltage range shall be 3-phase, AC, smooth. Shall be dry type and copper wound. Shall have operating capability at 50 degree ambient temperature. Input shall be 3-phase, 415 V, 50 Hz, AC Body shall be fully enclosed with ventilating ducts. Shall have lifting handle. Condition terminals shall be suitably sturdy and heavy duty with easy connection/disconnection facility. Compatible Ph fault & ELCB protection be provided at outgoing of terminal to safe guard test bench. Page 7 of 9 Pages

8 Guaranteed Technical particulars for 3-phase power Analyzer: For those offers that differs from the required technical specifications, details are to be described in the following GTP offers, with complete details therein and necessary documents/ test certificates/ base standards are to be supplied supporting the offers under GTP. 1 GENERAL OFFERS Weather conforming or not 1.1 Warm-up time 1.2 Operating temperature 1.3 Operating humidity 1.4 Storage temperature 1.5 Insulation resistance 1.6 Insulation withstand voltage 1.7 Power Supply 1.8 Consumed power 1.9 Size 1.10 Weight 1.11 Safety Standards 1.12 Emission 1.13 Immunity 2.0 INPUT SPECIFICATIONS: 2.1 Input type 2.2 Rated values: Crest factor Measuring instrument loss (Input resistance) 2.4 Maximum instantaneous allowed input (1 cycle, 20 MS duration) 2.5 Maximum instantaneous allowed input (1 sec duration ) 2.6 Maximum continuous allowed input 2.7 Maximum continuous common mode voltage (with 50 Hz input) 2.8 Common mode rejection ratio (CMRR) : 600 Vrms across input terminal and case 2.9 Input terminal type 2.10 A / D converter 2.11 Range switching 2.12 Auto range function 2.13 Measurement mode switching Page 8 of 9 Pages

9 3.0 MEASUREMENT FUNCTIONS: 3.1 System 3.2 Frequency Range 3.3 Crest Factor 3.4 Accuracy : 3.5 Power factor effect 3.6 Effective input range 3.7 Temperature coefficient 3.8 Display updating intervals 3.9 Lead / Lag Detecting 3.10 Frequency Measurements: 3.11 Crest Factor Page 9 of 9 Pages