In today's power grid, deviating from the ideal condition is usually due to the interference power grid power quality caused by nonlinear load and other load increases.With the introduction of new equipment and technology into the business field, power generation has become more and more complex.Poor power quality can cause serious damage to the production.In the worst cases, it may be the key tasks and highly sensitive environment (such as hospitals) pose a threat to human life.
雷竞技appFluke 378 FC clamp table can measure ac current and voltage.
雷竞技appFluke 378 FC can help find the power quality problems?
As the first to adopt FieldSense technology clamp table,雷竞技appFluke 378 FC clamp tableBy improving the existing workflow and create a new workflow, make the power quality test more popular, and changed the way the test.Now, industrial electrical division and a line of technical personnel can perform basic troubleshooting for single phase or three phase system and/or maintenance inspection, thus found previously undiscovered power quality problems.雷竞技appFluke 378 FC make a line of technical staff to measure the power quality of basic, and eliminate the following types of power quality problems:
- PQ - volt
- PQ - Mr Abe
- PQ - PF (power factor)
PQ - volt and PQ - Mr Abe is based on the rate of lost total harmonic distortion (THD), its definition is the sum of all the harmonic component of power and the ratio of the fundamental frequency power.
The power factor (PF)It is the expression of energy efficiency.It is usually expressed as a decimal value, of which 1.0 according to the most efficient, the lower the value, the lower the power consumption.Power factor is a kilowatt (kW) as the unit of work with kVA power (kVA) as the unit of the ratio of the apparent power.
PQ deixis is a background function, automatically display in determine the related problem.Instrument for THD % check voltage, current, power factor and monitoring.If the above a certain threshold, the alarm will remind the power quality problems.
雷竞技appFluke 378 FC in the PQ - PF model.
Settings:
- Will spin to control knob
(FieldSense) - Using grounding wires connect clamp table to end.
If the total harmonic distortion and power factor is beyond the scope of the sensitivity level of ideal, related will flash on the screen display:
雷竞技appFluke Connect application will also show this indicator.
The sensitivity level
Forceps sheet on the level of sensitivity adjustable high/medium/low level, each level has different PQ - ampere, PQ - volt, PQ - PF the threshold."High" is the most sensitive setting, small changes in THD will trigger the indicator.The default setting is "high", a single threshold is not the custom.
| function | The sensitivity | ||
|---|---|---|---|
| high | In the | low | |
| PQ - Mr Abe | 10% THD | 25% THD | 50% THD |
| PQ - volt | 8% THD | 10% THD | 15% THD |
| PQ - PF | 0.9 | 0.75 | 0.6 |
Change the sensitivity level steps
- Close the clamp table
- Hold down the
"Hold" (keep) button, at the same time will spin to Ṽ control knob.Clamp table will go to the options pattern - According to the
Browsing options and select the PQ Sensitivity (PQ) Sensitivity - According to the
Button to change the Settings
- loosenCan exit option mode.
Note: loosen the "Hold" button (keep) to make the clamp table exit option mode at any time, but will be kept for setting up the changes.
Using electric power quality indicators
A byproduct of harmonic is the modern electronic products.Harmonic is supply to the motor windings are harmful and high frequency ac voltage or current source.Determine assembly machinery may be caused by intermittent failures of power harmonic wave.Harmonic distortionCould lead to key equipment failure, causing downtime.The FieldSense technology and has the PQ indicator 378 FC clamp table can be found that the power quality problems, help technicians to know whether I need PQ analyzer or PQ experts to do further analysis.
378 FC clamp table can help determine the efficiency of motor and drive, so as to determine the capacity of motor or drive.Motor overload happens when the motor load is too large, this may be due to the large current, torque and eventually due to overheating.Overload causes 30% of motor fault, which reduces the low efficiency and capacity.378 FC can be used as the first line of defense, before determine whether need to be further diagnosis and analysis found that the power quality problems.
