Automatic electronic load limiting controller

Limit current controller: 1, the scope of application JSL integrated circuit fixed time limit current relay (hereinafter referred to as the relay), suitable for power network power supply lines, transformers, motors and other main equipment, and transmission and distribution systems as relay protection circuit appeared in the overload and short circuit protection. The product is a static multifunctional relay integrating start-up, delay, execution and signal indication, featuring high precision, low power consumption, accurate delay, high return coefficient, intuitive and convenient adjustment, large contact capacity, no need for independent operation power supply, etc. The product is suitable for overload and short circuit protection in power network supply lines, transformers, motors and other main equipment and transmission and distribution systems. The application of this product especially solves the compressed time level difference countermeasures requirements of the Ministry of Electric Power, overcomes the fatal weakness of the anti-time limit AC operation protection device and the fixed time limit protection of the power grid, and avoids the protection of the user’s faults caused by the overstep tripping and thus expanding the accident; the fixed time limit protection using the digital switch setting value, eliminates the original anti-time limit characteristics of relay in the fixed time calculation, the upper and lower levels of co-ordination and debugging, which brings a lot of tedious workload, greatly facilitates the operation of the static type multi-function relay. Eliminate the original inverse time characteristic relay, fixed value calculation, the upper and lower levels of cooperation and debugging brought about by a large number of cumbersome workload, greatly facilitating the design and field work of staff. It avoids the card phenomenon of GL series overcurrent relays and the deterioration in transport, and is an ideal replacement product for GL series relays.2 Main technical parameters3 Main technical parameters ●Overcurrent action value setting range: 2.0-9.9A; grade difference: 0.1A. ●Overcurrent action delay setting range: 0.05-9.99S; grade difference: 0.01S. ●Acid current breakage times Setting range: 2.0-8.0 times. 　　●Action time: the action time of current interrupter at any overcurrent setting value is not more than 50ms. ●Setting error: the error of current part at any setting value is not more than 2%+0.1A; the error at limit temperature is not more than 4%+0.1A; the delay error value of overcurrent delay is not more than 0.1%+10ms. ●Capacity of contacts: the contact capacity of the current interrupter at the voltage not more than 250V, the current not more than 5A, the level difference: 0.01S. ●Contact capacity: in the DC inductive load circuit with voltage not exceeding 250V, current not exceeding 5A and time constant of 5±0.75ms, the breaking capacity of the output contact of the product is 50W. The output contact can be reliably operated and returned to 5×104 times under the above specified load conditions. The long-term permissible switching current of the output contact is 5A. ● Thermal stability factor: 21n for long-term operation. 　　●Dielectric strength: The conductive terminals of the product are connected to the exposed non-electrically charged metal parts or between the shells, and can withstand 2000V (RMS) 50Hz AC voltage for 1 minute without any insulation breakdown or flashover phenomenon.

Functions of moulded case circuit breaker accessoriesPrinciple of operation of undervoltage disconnectors for circuit breakers