CS11-L Current Transformer 12/13 C o p y r i g h t © 2 0 0 1 - 2 0 1 3 C a m p b e l l S c i e n t i f i c , I n c .
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Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. General Description....................................................1 2. Specifications .............................................................1 3. Installation ...................................................................2 4. Wiring...........................................................................3 5.
Table of Contents Figures 1-1. 3-1. 4-1. 5-1. 5-2. 5-3. 6-1. 6-2. 6-3. A-1. A-2. A-3. A-4. A-5. A-6. A-7. A-8. A-9. A-10. CS11-L Current Transformer .............................................................. 1 AC load wire installed in CS11-L (color of ac load wire can vary) .... 2 CS11-L schematic ............................................................................... 3 ACPower Configuration 1 ................................................................... 5 ACPower Configuration 2 ......
CS11-L Current Transformer 1. General Description Campbell Scientific’s CS11-L (FIGURE 1-1) detects and measures the AC current along an electrical wire using the magnetic field that is generated by that current. The CS11-L does not have direct electrical connection to the system. The sensor outputs a millivolt signal allowing it to be directly connected to our dataloggers. The CS11-L is compatible with our CR200X, CR800, CR850, CR1000, CR3000, CR500, CR510, CR10(X),CR21X, and CR23X dataloggers.
CS11-L Current Transformer Measurement Ranges: 0.15 to 200 A (0.15 to 125 A for CR200X) Frequency: 50 and 60 Hz Insulation Resistance: 100 M ohm @ 500 Vdc High Potential: 2000 volts Rated Current: 200 A, 125 A (CR200X) Storage Temperature: –25º to 70ºC Operating Temperature: –25º to 55ºC Case Material: Polypropylene Resin Construction: Epoxy Encapsulated Accuracy with 10 ohm Burden Max. (resistive): 3.
CS11-L Current Transformer 4. Wiring The CS11-L uses a single-ended analog channel as follows: Wire Color Terminal RED WHITE or AG (VX on CR200X) SE BLACK or AG Shield or AG CS11-L Cable WHITE RED BLACK CLEAR 1250 mV offset CR200X All Other Wire Color Datalogger Dataloggers SE SE WHITE VX (EX) RED BLACK CLEAR FIGURE 4-1. CS11-L schematic If multiple wire passes are needed, see the end of the first paragraph in Appendix A.6, Multiple Passes Through the Sensor. 5. ACPower Instruction 5.
CS11-L Current Transformer 'CR1000 Series Datalogger ' CS11-L_with_ACPower_AmpsOnly.
CS11-L Current Transformer WARNING Working with live electrical equipment is dangerous! The user is responsible for ensuring all wiring conforms to local safety regulations and that the enclosure is labeled accordingly. DestAC The DestAC parameter is a variable or variable array in which to store the measurement results. The number of values returned depends upon the option chosen for the configuration parameter.
CS11-L Current Transformer Option Description 2 Split-phase with one voltage measurement and two current measurements. This configuration is typical of residential service-entry panels, as well as residential and commercial distribution panels. Split-phase configurations have two line (or “hot”) conductors plus a neutral conductor. See FIGURE 5-2. FIGURE 5-2.
CS11-L Current Transformer Option Description 3 Three-phase ‘Y’, four-conductor, configurations with three voltage measurements and three current measurements. This configuration is typical of commercial entry panels and commercial distribution panels. The four conductors are three line (or “hot”) conductors plus a neutral conductor. See FIGURE 5-3. FIGURE 5-3. ACPower Configuration 3 LineFrq The LineFrq parameter is the expected line frequency in hertz.
CS11-L Current Transformer MaxVrms The MaxVrms parameter is the expected maximum rms (root mean square) voltage to measure. MaxVrms is specified at the primary of the potential transformer, or equivalently, the non-datalogger side of the potential transformer. Typical values are 120 or 240. The datalogger uses VMult and MaxVrms to calculate which input range to use for the voltage measurement. ChanI The ChanI parameter is the single-ended channel for the current measurement.
CS11-L Current Transformer Current(RepsI). The measured current in amps rms, repeated to give RepsI values. VPhaseI(RepsI). The measured phase angle in radians that the voltage leads the current, repeated to give RepsI values. The cosine of VPhaseI is the power factor. VHarmRatio. The measured voltage harmonic distortion ratio given as the total harmonic content divided by the fundamental content at LineFrq Hz. VHarmRatio is unitless. IHarmRatio(RepsI).
CS11-L Current Transformer Current(3). The measured current in Amps rms for each of the three line conductors. VphaseI(3). The measured phase angle in radians that the voltage leads the current for each of the three line conductors. The cosine of VphaseI is the power factor. VHarmRatio(3). The measured voltage harmonic distortion ratio given as the total harmonic content divided by the fundamental content at LineFrq Hz for each of the three line conductors. VHarmRatio is unitless. IHarmRatio(3).
CS11-L Current Transformer TABLE 6-1. Max Amps on Each of the Range Codes in the Datalogger (one pass only). Datalogger >>> Range Codes (mV) CR200(X) Series 2.5 CR10X CR500 CR510 0.5 CR1000 CR800 CR850 0.5 5 CR21X CR23X 0.000133 1 7.5 1.5 0.000067 1.5 0.000400 10 2 15 0.000133 3 0.000200 20 4 25 5 5 50 200 50 10 10 0.000666 40 40 0.002660 50 500 0.013340 100 1000 0.006660 200 2500 125 5000 200 6.1 200 200 200 0.000134 0.
CS11-L Current Transformer Below is an example CR1000 program. In the program, a multiplier of 0.2 is applied to the rms value; see Appendix A.4, Multiplier, for more information. 6.1.1 Example CR1000 Program 'CR1000 Series Datalogger ' CS11-L_with_ACPower_Instruction.
CS11-L Current Transformer samples 25 times, and the second CR200X example program has a loop that samples 30 times. A 25-sample loop produces almost two cycles of a 60 Hz waveform, and a 30-sample loop produces almost two cycles of a 50 Hz waveform (see FIGURE 6-1). The average energy under the curve is calculated using the RMSSpa instruction. A multiplier of 0.2 is applied to the rms value; see Appendix A.4, Multiplier, for more information.
CS11-L Current Transformer EndIf CallTable Amp NextScan EndProg 6.2.2 CR200(X) Program for 50 Hz 'CR200 Series Datalogger ' Program name: CS11-LManual50Hz.cr2 'date: Jun 2013 Const Samples = 30 of 50 Hz.
CS11-L Current Transformer Six Cycles at 60 Hz Burst CR10X I Instanteneous FIGURE 6-2. Graph of CS11-L waveform using burst mode The following CR10X program generates the waveforms shown in FIGURE 6-2. NOTE The instructions listed below do not store data in final storage. P92, P77, and output processing instructions such as P70 are required to store the data permanently. 6.3.
CS11-L Current Transformer 3: Beginning of Loop (P87) 1: 0 Delay 2: 50 Loop Count 4: Z=Z+1 (P32) 1: 1 Z Loc [ Counter ] 5: If (X<=>F) (P89) 1: 1 X Loc [ Counter ] 2: 1 = 3: 50 F 4: 10 Set Output Flag High (Flag 0) 6: Set Active Storage Area (P80) 1: 3 Input Storage Area 2: 2 Loc [ BurstAmps ] 7: Standard Deviation (P82)^3012 1: 1 Reps 2: 4 -- Sample Loc [ Amps_1 ] 8: End (P95) 6.4 21X, CR7 Dataloggers Some Edlog dataloggers such as the 21X and CR7 do not have a burst mode.
CS11-L Current Transformer NOTE The instructions listed below do not store data in final storage. P92, P77, and output processing instructions such as P70 are required to store the data permanently. 6.4.1 Example CR21X Program 3: Z=F (P30) 1: 0.0 2: 4 F Z Loc [ Counter ] 4: Beginning of Loop (P87) 1: 0000 Delay 2: 90 Loop Count 5: Z=Z+1 (P32) 1: 4 Z Loc [ Counter ] 6: Volt (SE) (P1) 1: 1 2: 14 3: 1 4: 57 -5: .2 6: 0.
CS11-L Current Transformer 6.5 CR1000 with Multiplexer Sample Program This program uses the CR1000 and an AM16/32-series multiplexer to read 32 CS11-L Current Transformers. 6.5.
CS11-L Current Transformer 6.6.1 Example CR10X program reading 32 CS11-L Current Transformers ;{CR10X} ; Example program for CS11-L ; ; Program to test the CS11-L sensor on a CR10X datalogger ; and AM1632 Multiplexer. ; *Table 1 Program 01: 30 Execution Interval (seconds) ; Turn on the multiplexer 1: Do (P86) 1: 41 Set Port 1 High 2: Excitation with Delay (P22) 1: 1 Ex Channel 2: 0 Delay W/Ex (0.01 sec units) 3: 15 Delay After Ex (0.
CS11-L Current Transformer 10: Do (P86) 1: 3 Call Subroutine 3 11: Z=X (P31) 1: 3 X Loc [ Burst_A2 ] 2: 5 -- Z Loc [ CS11_2 ] 12: End (P95) 13: Do (P86) 1: 51 Set Port 1 Low ; This part of the program will store a one minute average of the amperage.
CS11-L Current Transformer 10: 71 11: .2 12: 0.0 Loc [ Amps_1 ] Multiplier Offset 3: Burst Measurement (P23) 1: 1 Input Channels per Scan 2: 15 2500 mV Fast Range 3: 2 In Chan 4: 0001 Trig/Trig/Dest/Meas Options 5: 2.0 Time per Scan (msec) 6: .05 Scans (in thousands) 7: 0 Samples before Trigger 8: 0.0 mV Limit 9: 0000 mV Excitation 10: 123 Loc [ AmpsII_1 ] 11: .2 Multiplier 12: 0.0 Offset 4: End (P95) 5: Beginning of Subroutine (P85) 1: 2 Subroutine 2 6: Z=F x 10^n (P30) 1: 0.
CS11-L Current Transformer 15: Z=F x 10^n (P30) 1: 0.
Appendix A. Theory of Operation A.1 Typical Electrical Circuit An example of a typical electrical circuit is a generator that provides energy in the form of a 60 Hz sine wave. The energy is carried from the point of generation to the point of consumption via two wires. The generator creates an electrical load that lights up the light bulb (see FIGURE A-1). FIGURE A-1. Generator schematic To determine the consumption (amps) of the load, a way is needed to measure what is passing through the wires.
Appendix A. Theory of Operation Wire added during installation Internal shape of the transformer CS11-L FIGURE A-3. Schematic of current transformer with the wire FIGURE A-4. CS11-L with the wire A.2 Current Transformer Description A current transformer is a special kind of transformer that transfers energy from one side to another through magnetic fluxes (see FIGURE A-5). FIGURE A-5.
Appendix A. Theory of Operation The formula for a transformer is as follows (Equation A): i1 • n1 = i2 • n2 Equation A Where i = amps and n = number of turns or windings And where n1 is the primary winding and n2 is the secondary With the current transformer, the primary coils or windings are minimized to avoid removing power out of the circuit, but still have a signal large enough to measure (see FIGURE A-6). Only 1 pass Many windings FIGURE A-6.
Appendix A. Theory of Operation The CS11-L contains a 10-ohm burden (shunt) resistor (R=10 ohm). Therefore, E is: E = 0.01 amps • 10 ohms = 0.1 volts (or 100 mV) From these calculations, it can be determined if a better resolution on the measurement is needed. The Range Code can be lowered to 250 mV for some dataloggers. A.4 Multiplier Use Equation D to calculate the multiplier.
Appendix A. Theory of Operation 1400 1350 1300 1250 mV Offset (needed for CR200X) mV 1250 1200 1150 1100 80 1 2 4 3 6 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 60 Samples 40 mV 20 0 mV Offset for Dataloggers other than CR200X 0 -20 -40 -60 -80 1 2 4 3 6 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Samples FIGURE A-8. Adding 1250 mV creates positive output Adjusted Measurement Range mV signal CR200X 2500 2000 mV 1500 1000 500 0 FIGURE A-9.
Appendix A. Theory of Operation FIGURE A-10.
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