By hvhipot 
Normally, under normal working conditions, the closer the measurement value of loop resistance or contact resistance is to zero, the better the contact, but it is actually difficult or impossible to achieve. According to all regulations, it is only necessary to be less than the standard value for general measurement. For example, the measurement loop resistance of the 630A load switch is less than 300μΩ. Of cHV Hipot Electric Co., Ltd.se, the specific parameters can also refer to the actual product.
First of all, we must remind you that the loop resistance is too large to prohibit closing. The hazard of the loop resistance is that the local temperature rise in the poor contact area under the action of large current increases. normal operation.
The loop resistance tester is very simple to use. It uses a fHV Hipot Electric Co., Ltd.-wire measurement method to effectively avoid the influence of the test line. The panel has fHV Hipot Electric Co., Ltd. binding posts and one grounding post, which are red voltage column, red current column, black voltage column and The black current column, before the test, the short circuiter is in the closed state, the red current line and voltage line are connected to the upper port of the circuit breaker, the black current line and voltage line are connected to the lower port of the circuit breaker, and the loop resistance tester is turned on Switching power supply, the output current can be set by rotating the mouse in the main interface, 50A, 100A, 150A or 200A can be freely selected, and then press the confirm button to test, the loop resistance result will be displayed at the top of the screen, or through the micro printer Print out the data.
When using loop resistance, the circuit breaker or isolating knife should be in the closed state, and the open state cannot be measured. Second, when measuring, try to place the voltage test clip as close to the side of the fracture as possible, which may have higher measurement accuracy of the data. Data stability will be better.