Energy storage insulation detection principle

What are the methods used for insulation monitoring in energy storage field?

Currently, the methods used for insulation monitoring in the energy storage field are mainly external resistance method and AC injection method. The AC current injection method generates a square wave signal which is then injected into the RC circuit between the HV line and the Protective Earth (PE) through an RC filter or transformer.

What are the common methods of insulation detection?

Principles of common methods for insulation detection: National standard method： The improved volt ampere method is used to measure the insulation resistance, that is, the reference resistance is used in parallel, and the insulation resistance is obtained through simple mathematical operation.

What are the methods and characteristics of insulation resistance detection?

Common methods and characteristics of insulation resistance detection: Voltammetry: It is simple and easy to measure and calculate. The resistance measurement has good real-time performance, but the voltage and current measurement are required to be synchronized.

What is insulation monitoring?

Insulation monitoring, also known as insulation resistance monitoring or earth fault monitoring, detects insulation faults and prevents electrical hazards, such as short circuits and electric shocks. IMDs detect real-time insulation deterioration prior to a fault occurring.

What are the standards and principles of DC insulation test?

According to the Gb/T18384.1-2015 standard for on-board rechargeable energy storage systems, the BMS is required to conduct insulation tests on the integrated state of all components of the power lithium-ion battery system and use the insulation resistance value to calculate the insulation state.

How does an insulation monitoring device work?

The insulation monitoring device monitors this insulation resistance and initiates a shutdown in case the insulation resistance is not sufficient. Designers must consider the isolation requirements that apply to achieving basic or reinforced isolation (these can be determined based on line and peak voltages).