The system can monitor electric parameters such as voltage, current, active power, reactive power, power factor, electric quantity, on/off status of switches, and send collected data to power management department on surface for display, store and issue;

Monitoring computer of the system in power management department on surface can modify remote alarming value or set value of action of integrated protection devices for underground switches by online;

The system can collect signals such as position of switch’s breaker, position of knife-switch, various protection actions on regular time, and record all the events in order;

The system can make remote control of open/close of switch in power management department on surface and monitoring station of transformer station;

The system can make remote video monitoring of transformer stations and devices in mine underground. The main monitoring computer can display embedded video images, video images of alarm linkage of personnel break-in, fire and so on, and record video images into hard disk for enquiry;

When events happen such as override tripping, power failure, the monitoring computer can send alarming sound and display in alarming window with alarming type, status, time and so on;

The system can store event records, failure wave record of integrated protection devices for switches, convenient for engineers to analysis and determine failure;

The monitoring computer in power management department on surface can make remote leak test and records for integrated protection devices for flameproof low-voltage switches in mine underground, and make automatic record of manual leak test;

The system can make assessment of electricity utilization by shifts for teams or areas;

The monitoring station of the system has functions of field plugging-in and modifying integrated protection communication module, and can be networked with other integrated protection devices;

The system has two monitoring computers, ensuring reliable running of the system;

The system has remote networking interfaces such as OPC, CDT.

Solution for Override Tripping of Power System

Override tripping of power system happens due to that it is hard to realize selective circuit shortening protection because of short power supply circuit and due to switch malfunction and so on. By modern digital technology, accurate time delay setting, short-circuit current protection setting, and reasonable integrated protections, Model KJ36A Power Monitoring & Control System for Coal Mine can realize 3-stages current protection for power supply circuit in mine underground and selective circuit shortening protection. For switch malfunction or error function, the solution is to improve reliability and stability of integrated protection devices, increasing its surge and fast transient testing voltage of EMO features to 4000 kV.

Precautionary Measure for Blackout of Power Supply System

The blackout of power supply system in coal mine may happen due to override tripping because of short-circuit, or due to under-voltage protection of switch because of transient voltage loss. The integrated protection device of Model KJ36A Power Monitoring & Control System for Coal Mine has function of under-voltage delay protection, avoiding transient voltage loss and large-area tripping.

Security Measures for Remote Control of Flameproof Switch

The key point of remote control of flameproof switch is the control security and reliability. In Model KJ36A Power Monitoring & Control System for Coal Mine, when the main computer sending out control command and the monitoring and control station of transformer station receiving the command, the monitoring and control station will not execute the control command until after communication data verification, operation sheet comparison, comparison of methane concentration of power sending area, on-load operation comparison, ensuring the security and reliability.

Failure Position Function of Power Supply System

By utilizing 3-stages current protection, under-voltage delay protection and other technologies, Model KJ36A Power Monitoring & Control System for Coal Mine greatly solves the problems of override tripping, large-area blackout, also can find out the failure circuit rapidly by failure position technology if any failure happens.