product summary
switch The power of short-circuit arc light in the cabinet can be as high as 100MW, the energy generated by the arc burning increases exponentially with the burning time of the arc and the change value of the short circuit current (as shown in the figure below). The high temperature and high pressure generated by the burning will gradually destroy the components, copper bars and the whole switch cabinet. The high degree of arc light and harmful gases will also cause great harm to the human body.
In the short circuit fault of medium and low voltage buses in our country, the main equipment and personnel injuries are mainly caused by arc light. However, most medium and low voltage buses in our country are not equipped with fast bus protection, but only simple arc suppression devices and transformer Backup protection. These protections operate slowly, often extending the fault removal time, thus further expanding the extent of equipment damage and affecting the safe operation of the entire power grid.
Product composition
2.1 Main control unit YXHG
function
a. Two groups of three-phase current and zero sequence current detection;
b. 160 * 160 size LCD display;
c. Standard configuration 6-way high-speed tripping contact;
d. Standard configuration 4-way input; 4-way programmable relay output
e. More devices can be connected 20 arc light sensor signals;
f. The tripping logic is optional, and the arc light plus current criterion ensures the tripping reliability;
g. standard RS485 communication interface, supporting MODBUS standard protocol;
h. Unit self-test function, including device hardware failure;
2.2 Optical fiber arc light sensor
a. Optical fiber transmission
b. Standardization ST Connector
c. Action threshold can be adjusted
Product features
three point one Fast and reliable action
Special The algorithm can judge the arc light change signal and current change signal in a short time and quickly exit to ensure that the arc light of the equipment in the switch cabinet is Cut within 100ms.
three two High reliability of tripping logic
According to the characteristics of arc light generation, the device adopts arc light and current double criteria, which is simple and can effectively ensure the accuracy of action.
three three Powerful electrical performance
The fault arc light probe and connecting line are all optical fibers with strong Electrical isolation effect. The device fully meets EMC standards ensure the overall stability and operation reliability of the arc light protection system.
three four Fault information record
After the fault arc light occurs and causes the device to trip, the main control unit can accurately record the position of the arc light probe, and can record the fault phase current value at the action time in detail.
three five Strong anti electromagnetic interference ability
satisfy EMC Class IV requirements, good anti-interference ability.
