How to calculate the withstand voltage of the medium? 50

New PCB board 20kv mm or 500v mil; (This means that the thickness of the medium is 1mil, and the breakdown voltage that can be withstood is 500V).

Withstand voltage 300V mil after long-term aging; (This means that the thickness of the medium is 1mil, and the breakdown voltage that can be withstood is 300V).

The conventional FR4 plate used in the actual factory, but some of them are calculated according to 250V MIL, for example, the thickness of the dielectric layer of L1-L2 is, then the withstand voltage is 250*.

I don't know about the pressure I only know about the laminate structure.

A dielectric is an insulating medium, commonly known as insulation. The dielectric strength test you mentioned is the dielectric strength test, which is the insulation test. The insulation test is divided into non-destructive and destructive, and the withstand voltage test is destructive.

The dielectric strength tester of insulating oil conforms to GB T507 and DL standards, and is used to test the degree of physical pollution of insulating oil by water and other suspended substances. The method of determination is to test the oil in a professional equipment and undergo the action of an alternating electric field that is evenly increased at a certain speed until the oil is broken down. It can be widely used in electric power, petroleum, chemical and other industries.

Hipot tester is a commonly used testing instrument, which is mainly used for the withstand voltage test of polyethylene insulated power cables, and can also be used for the insulation withstand voltage test of large power transformers. A1160 Withstand Voltage Tester Operation Precautions The withstand voltage meter conforms to GB T507 and DL standards, and is used to test the degree of physical pollution of insulating oil by water and other suspended substances. The method of determination is to test the oil in a special equipment and undergo the action of an alternating electric field that is evenly increased at a certain speed until the oil is broken down.

It can be widely used in electric power, petroleum, chemical and other industries.

The resistive dielectric withstand voltage is the maximum voltage that the resistive insulating material can withstand, also known as the isolation voltage. For through-hole resistors, the maximum voltage that can be applied between the resistor leads and the resistive housing insulation protective coating for one minute without breakdown.

For example: **The aluminum shell of the aluminum shell resistor is a conductor, and the internal resistor is also a conductor, and it should be insulated from the shell, and the internal dielectric insulation is limited, so there must be a withstand voltage index.

New PCB board 2kv mm or 500v mil; (This means that the thickness of the medium is 1mil, and the breakdown voltage that can be withstood is 500V).

Withstand voltage 300V mil after long-term aging; (This means that the thickness of the medium is 1mil, and the breakdown voltage that can be withstood is 300V).

The conventional FR4 plate used in the actual factory, but some of them are calculated according to 250V MIL, for example, the thickness of the dielectric layer of L1-L2 is, then the withstand voltage is 250*.

Film capacitors are widely used in analog circuits due to their non-polarity, high insulation resistance, excellent frequency characteristics (wide frequency response), and low dielectric loss.

So how is the pressure damage of film capacitive dielectric celebrated? Due to the large loss d value at the local weakness in the capacitive medium, a large amount of local heat will be generated and the medium will be damaged under the uneven high field strength.

When the DC voltage is applied, the heat is only generated by the leakage current, especially for the newly produced capacitors, the insulation resistance is generally very high, the leakage current is very small, and the possibility of local overheating damage is very small.

In addition, if the applied AC voltage reaches the initial PD voltage value, the PD will repeat and deteriorate every half cycle, causing local damage.

At DC voltage, even if there is an initial partial discharge, it must wait for the charge to dissipate and re-accumulate before it can produce a partial discharge.

In summary, it can be concluded that the current withstand voltage may cause serious damage to the capacitive dielectric, while the DC withstand voltage can basically be argued as a non-damage detection method for film capacitors, or at least a detection method with little damage.

No, dielectric strength testing in operation, due to the action of oxygen, high temperature, high humidity, sunlight, strong electric field and impurities, the performance of the insulating oil will gradually deteriorate, so that it can not give full play to the insulating role, so it is necessary to regularly carry out relevant tests on the insulating oil to identify whether its performance deteriorates. The quality of the insulating oil is closely related to the breakdown voltage.

The withstand voltage value is determined by the type of dielectric and the distance between the two boards of the capacitor, and does not depend on whether the capacitance is increased.

No, increasing the withstand voltage value only increases the withstand voltage value of the capacitor, and the capacitance does not change.