On a global scale, the solar energy device (also known as photovoltaic, or PV device) continues to grow rapidly, it is due to the economic benefits of utility scale solar power extremely attractive to caused by the efforts of the carbide as well as to the power grid.With solar power distribution system and the load becomes more and more big, more and more complex, the possibility of transient overvoltage increases, and its influence on security has become more important than ever.
When you in the solar device to measure the transient is invisible, but also to a large extent is inevitable, this means that the protection of you depends on has a built-in safety margin in the tool.This is the role of "safe level measurement category" : it aims to tell the user measuring equipment can measure the electrical safety device type.
However, the voltage rating alone cannot tell your handheld tools in the design how the ability to withstand high transient pulse - its category security levels also need to fit your working environment.
Information about overvoltage category security level instructions
Measurement category security level of standards is to ensure the safety.The international electrotechnical commission (IEC)The safety standards of the measuring device to make sure the instrument and the operator will never become a weak link in the system, in the event of voltage transients, also won't become a point of failure.Measurement categories are defined as follows.
| Measurement category | The sample |
| The CAT IV |
|
| The CAT III |
|
| The CAT II |
|
IEC 61010 safety grade is suitable for less than 3000 V power measurement values of the test equipment, and for the power supply installation and IEC 60664 definition of overvoltage category definition and corresponding transient protection.
The classification of the power distribution system based on the fact that dangerous high-energy transients (such as lightning, switch transient) through system impedance (ac resistance) will happen attenuation or damping.Measurement category越高，可用的预期故障电流就越大，电压瞬变也就越高——在 CAT III 环境中小于 1500 V 时测量电源，峰值最高可达 10000 V。
Environment that is CAT III solar installation
IEC 61730-1 pv module is defined as the permanent wiring of electrical devices (CAT III), instead of using the power socket (CAT II).
In addition to actual over voltage instantaneous value test, hand-held measurement tools also need the internal components and circuit between nodes with minimum insulation level (solid insulation, the combination of the clearance and creepage), security levels to meet the corresponding category.Circuit inside the insulation can prevent fire/arc fault, also can prevent the operator to get an electric shock.Working voltage and measure the category the higher security level, the higher the required insulation.
In the category of measurement, high voltage rating said higher transient resistance rating.CAT III 1500 V instrument, for example, can bear higher energy transients, therefore to a safe level for CAT III compared to the 1000 V instrument, can provide more excellent protection.
Solar power voltage rising
Overvoltage CAT III 1500 V system is becoming the new normal, in the field of solar energy for the facility owner save the cost and increase efficiency.Every inverter can be used to deal with more energy, more panel can series into a longer string, reducing the required cables and inverter.
In order to ensure the safety and accuracy, under the environment of overvoltage CAT III measurement need to use the CAT III safety level tools.
雷竞技appFluke 393 FC Solar Clamp MeterIs a fluke products first in the family of 1500 V / 600 V IV CAT CAT III true RMS clip-on table, its accordance with the requirements of the solar energy device CAT III environments such as insulation, measure the voltage of 1500 V dc.
CAT III 1000 V current clamp pk dielectric test for 8000 V / 7000 V RMS.For the CAT III 1500 V, 10000 V pk / 9700 V RMS.
At the time of PV panel and select measuring tool, consider the work in the worst case is worth it.First of all, please choose a security level that suits you could measure the highest category of instrument.Then, find out the rated voltage meet your demand.For your environment to choose the appropriate CAT safety level tools that can help you and your team in reducing the risk of reliable measurements made at the same time.
393 FC conform and photovoltaic array of electrical installation overvoltage category level (IEC 61730-1), the corresponding test equipment safety requirements (IEC 61010-2-032).Which can be applied in solar and battery provides up to 1500 V dc safe and accurate voltage measurement, and have the function of the helps to simplify the work:
- The j雷竞技appaw jaw than Fluke 37 x clamp table thin 25%, can be in the narrow and cramped space measure more easily and quickly
- IP protection level 54, applicable to the dusty and rainy outdoor environment
- 雷竞技appFluke Connect ™ data is collected and stored in the cloud, so that anytime, anywhere access
- The attached CAT III 1500 V wire insulation test
- Carrying a fluke of proven safety, durability and reliability of commitment
Why use CAT level III in the solar installation tools?In the final analysis or safety: to ensure your safety.Don't you (or your team) to the protection of any tools do not have appropriate security levels.
