Electrical power measurement is a key for innovation.

The Yokogawa CW500 is a portable power meter that utilizes a current clamp sensor for use in the field enabling consumption and power quality measurement of the power line.

By the navigation screen of the unit, the connection setting and detail setting of the unit is simple and direct by following the screens.

Keys which directly turn on desired measuring screens allow comfortance at the use of field.

Stored measured data are easily accessed by a click on the file with included PC software.

 

Simultaneously measures 3 CH Voltage input, 4 CH current clamp-on probe input, 2 CH DCV input. Displays value list or trend graph screen of Instantaneous/ Average/Maximum/Minimum of Voltage/Current/Power/Power factor/Phase Angle/Phase Advanced Capacitance Calculation and DCV input. Integration Value of Active/ Reactive/Apparent Energy is each displayed by consumption and generation. Demand value can be monitored by screens of present power consumption compared to aimed demand power value.

 

Quick Start Guide Function:

• Start Guide Function supports secure wiring and setting before measuring.
• Automatically recognize the type of current clamp-on probe.

Vector Display:

• Indicates Voltage and Current phase difference and values between input channels of voltage and current.
• Checks whether the wiring is appropriate or not.

 

Measure Temporary Malfunction of Power Line

• Captures temporary malfunction phenomena of power line which causes malfunction or destruction of devices by types (Voltage swell, Voltage dip, Voltage interruption, Transient overvoltage, inrush current) as an event by high sampling rate of 24 µs and RMS calculation.
• Event data contains the type of malfunction, occurred time or occurrence finish time, measured value and waveform of voltage and current of all channels for approx. 200 ms period.
• Measurement method conforms to IEC standard 61000- 4-30 Class S

Measure Continuous Malfunction of Power Line

• Harmonics
  Measure and display graphs and list of up to the 50 th Harmonic components of voltage, current and power for each phase and in total.
• Waveform
  Displays with up to 10 or 12 waveforms of voltage and current for each CH.
• Flicker
  Measures, 1 minute flicker (Pst, 1 min), short flicker (Pst) and long flicker (Plt).
• Unbalance rate
  Displays voltage and current unbalance rate on 3 phase wiring.

 

CW500Viewer (Included PC software)

• Automatically generates graph and report by simple clicking on a file data displayed on screen.
• Uniform management of main unit settings
• Realtime measuring by USB communication.

Types of data

• Power data, Power quality event data, Main Unit Setting data, Screen capture data.

Memory card and interface

• SD Memory card, USB communication, Bluetooth communication (Available for USA, Canada and Japan only)

 

Power line and Input Channel: 3 CH Voltage, 4 CH for Current Clamp Probe.

1P2W (up to 4 system), 1P3W (up to 2 system), 3P3W2current (up to 2 system), 3P3W3current, 3P4W
 

Power measuring item:

 

Instantaneous, Average, Maximum and Minimum values:

Voltage/Current/Power (Active, Reactive, Apparent)/Power factor/ Phase Angle/Frequency/Calculated Phase Shift Condensor/DC voltage value 2 CH.
 

Integration Value

• Energy (Active, Reactive, Apparent) each by consumption and generation
• Demand (Occurrence of max. demand time, current demand, estimated demand value)

Recording Interval Period:

1/2/5/10/15/20/30 second, 1/2/5/10/15/20/30 minute, 1 hour/2 hours
 

Recording method

Manual, time setting, period setting
 

Estimated Recording Length with 2 GB SD card.

 

Interval	Power recording	+Harmonics
1 sec.	13 days	3 days
1 min.	Over 1 year	3 months
30 min.	Over 10 years	Over 7 years

• The recording length shortens according to the number of power quality events.
• Only included SD memory card or dedicated SD memory card is guaranteed.

Various Measuring Screen

• List display, Zoom display by 4 or 8 division, Trend graph display
• Integration Value Display for Energy
• Demand List display of value, Demand Graph display for change of period, Demand Graph display for whole recording

List Display

   

Hems of measuring values can be selected with position.
 

Zoom Display

   

Zoom display can be selected by 4 or 8 division.
 

Trend Graph

   

Trend graph of voltage/ current/power/power factor/frequency/ advanced phase condenser/DC voltage
 

Energy Display

   

List of Active, Apparent, Reactive by consumption or generation.
 

Demand measuring

Demand is the average power value of a specific period (usually 30 minutes). Contract with the power supplier conditionally concerns the maximum average power value between period for the consumption fee. This function supports how to maintain within the target consumption by monitoring the estimated demand value to the setting rate, with the maximum demand value.
 

List of Demand Value

   

Graph display of change on specific period

   

Graph display of whole demand trend

     

Analysis and report is enabled by simply clicking on the desired data on software screen. Analysis is capable by trend graph, average, maximum and minimum value of voltage, current, power, power factor. Report generating could be set by day time, night time, working day, off day or monthly period. Additionally energy data to quantity of crude oil barrels, or to CO 2 can be converted.
 

Trend analysis graph

   

Sample of report

   

Short period power line malfunctions such as voltage swells/dips/interruptions/transient overvoltage or inrush currents, or long period such as harmonic distortion, flicker may damage or reset your devices.

The CW500 helps to identify each of those short period malfunctions, by recording occurrence time, occurrence finish time and waveforms. Additionally there is a digital output on occurrence.

Long period malfunctions can be analyzed by harmonics, flicker, waveform or checking on the unbalance rate calculation for 3 phase measurement.

All data can be finalized to a report format with included software.

The CW500 conforms to the IEC standard of 61000-4-30 Class S.

 

Power line malfucntion phenemona	Example of cause and influence	Example of waveform	Notes
Voltage Swell	Lightnings or heavy load switching on power line may cause momentary swell on voltage.
Voltage Dip	Generating moments on motor load may cause an inrush current and cause dips on voltage.
Voltage interruption	Momentary or long interruption to power distribution by lightning or open breakers		Occurred time and waveform is recorded. Digital output is set on during the occurred period.
Transient overvoltage (impulse)	Lightning or heavy load switching on power line may cause momentary change on voltage.
Inrush current	Generating moments on motor load may cause an inrush current.
Flicker	Increase and decrease on certain phases could cause flickering distortion on voltage and currents.		Pst (1 min), Pst or Plt is measured.
Harmonics	Inverter and Thyristor circuits (phase control cirtuits) which are used for the control circuit of general devices could affect currents and cause harmonic distortion.		Up to 50 th harmonic contents are measured.
Unbalance rate	Heavy loading on a specific phase, could influence motor operation and could cause harmonic distortion.		Voltage and Current unbalance rate measured on vector screen for 3 phase

 

Capture temporary power line issues

Various kind of power issues are captured by high sampling rate of 24 µs and overlapping RMS measuring by half cycles. They are recorded as an event by occurred time, occurrence finish time and waveforms are recorded.

• Main unit displays list of occurred issue by types.
• Recorded data are easily analyzed and report is generated by PC software.

 

Capture continuous power line issues

 

Harmonic Measuring

• Displays components of up to the 50 th Harmonics contents by individual channel or overall by graph or list
• Displays the maximum occurred point on graph.

 

Flicker

 

Displays list or graph of 1minute flicker (Pst, 1 min), short term flicker (Pst) or long term flicker (Plt).
 

Waveform
 

Displays voltage and current waveform by all or individually.

It can be zoomed in and out by vertical or horizontal with rate selection below.

Vertical rate: 0.1, 0.5, 1, 2, 5, 10

Horizontal rate 1, 2, 5, 10

 

User Friendly

 

Quick start guide and Automatic type of clamp identification

A quick start guide will show how to wire and how to set the range before measuring which ensures the settings are correct.

The sensor identification will detect the type of clamp-on probe and set the highest range of the type.
 

Start of guidance PUSH “START/STOP”key and select “Quick start guide”. Recording item selection will be displayed.
Wiring Select the wiring and the appropriate connection diagram will be displayed. Connect the voltage probe and clamp-on probe accordingly.
Wiring check/self diag./self id. Wiring check, self check and type of clamp-on probe identification will be executed and the results will be displayed. If NG is displayed, detail could be confirmed by ENTER key.
Recording setting Set recording interval time and recording time or period.

 

Power supply from measuring line

Power (under 240 VAC) can be supplied by using the “Power supply adapter” (sold separately).
 

Leakage current measuring

External magnetic field effect is 0.002 A or less, at 400 A/m.

Yokogawa’s proprietary technology has achieved a magnetic field impact amount of 30 ppm even in adjacent power lines (at 100 A), Below is an example to measure neutral line of 3 phase 4 line.
   

Multiple line measuring

 

4 system load measuring

Maximum of 4 systems is capable for 1 phase 2 line

Maximum of 2 systems is capable for 1 phase 3 line or 3 phase 3 line.