Shanghai Zhimao Electronics Co., Ltd.

Body load box programmable load AC load
Body.
.AC load The company's main product
. Has obvious technical advantages
. Each
.Total installed capacity< br/>.Step amplitude
meets
.Inverter anti-islanding protection test and detection requirements
.(
.Single-phase
.)
. Each
.Total installed capacity
.Step amplitude
.Meet
.Inverter anti-islanding protection test and detection requirements
.Each
.Total installed capacity Capacity
. Step amplitude
. Meet
. Inverter anti-islanding protection test and detection requirements
. Each
. Total installed capacity
. Step Amplitude
. Meets
. Inverter anti-islanding protection test and detection requirements
. Each
. Total installed capacity
. Step amplitude
. Satisfies< br/>.Inverter anti-islanding protection test and detection requirements
.Various
.Total installed capacity
.Step amplitude
.Meet
.Inverter anti-islanding protection Islanding protection test and detection requirements
. Each
. Total installed capacity
. Step amplitude
. Meet
. Inverter anti-islanding protection test and detection requirements
.Each
.Total installed capacity
.Step amplitude
.Meet
.Inverter anti-islanding protection test and detection requirements
.Each
. Installed capacity
. Step amplitude
. Meet
. Inverter anti-islanding protection test and detection requirements, fixed
. Each
. Installed capacity
.Step amplitude
.Meet
.Inverter anti-islanding protection test and detection requirements, mobile
.Various
.Installed capacity
.Step amplitude
.Meet
.Inverter anti-islanding protection test and detection requirements
.AC load
Load box programmable load AC load
Body.
.1.< br/>. Difficulties regarding the resonant frequency of AC loads. In order to simulate an island operating environment, it is necessary
. The load can accurately generate a stable fundamental frequency (
. or
.). The resonant frequency formula ,
. and
. must be balanced to reach the fundamental frequency. In order to implement inverter testing with high efficiency, when selecting the anti-islanding test and testing device, you must pay attention to selecting a set of loads that can stably, quickly and automatically debug the fundamental frequency.
. 2.
. AC load Regarding the impact of the inverter output reactive power on the resonant frequency, all tested photovoltaic inverters must have reactive power output. The reactive power may be capacitive or it may be capacitive. Emotional. The key is that when implementing the anti-islanding effect protection test, the inverter output reactive power must be automatically compensated for load debugging to avoid over- and under-frequency triggering of the protection during the test process, resulting in erroneous measurement results. Therefore, be sure to choose a set of loads that can automatically compensate for the reactive power output by the inverter.
.3.
. The influence of AC load on the measurement results of parasitics. If the inductive load in the test is larger than the capacitor, the resonant frequency will be greater than
The inductive load is smaller than the capacitor, and the resonant frequency will be less than
. br/>And
.The parasitic amount of the load components is too large, which will cause the resonance frequency deviation,
.With
.each deviation
.%
will lead to resonance. Frequency deviation
Loads produced by Shenzhen
Company and other companies usually have a parasitic amount of around
%
, which cannot meet the islanding test. During the inverter anti-islanding automatic protection test, it is necessary to avoid over- or under-frequency triggering of the protection at the resonant frequency (over- and under-frequency protection is
. seconds), which may lead to errors in the anti-islanding protection test measurement data and measurement results. Some inverter manufacturers can protect the island during workshop experiments, but cannot achieve island protection when they are sent to the laboratory for identification and testing. The problem lies in the load quality.
.AC load
. Professionally produced by Hangmao Electric
. The load may automatically compensate for the influence of parasitics on the measurement results. patented technology.
. Hangmao Electric specializes in the field of backup power supply testing. We sincerely recruit agents nationwide. Welcome
. Sales of supporting equipment are welcome.
. AC test load device
. Programmable load box Load AC load