Power substation monitoring and control system can provide real-time information, especially the switch and protection behavior of information (accident alarm information), and make the personnel on duty and system dispatch personnel to grasp the initiative of security control, accident treatment, at the same time can improve the management level of power network, reducing the loss of substation, power distribution, improve the quality of power supply.
A specific monitoring, system objects:
Main microcomputer monitoring system of transformer substation monitoring object has the following several aspects: analog acquisition has a high pressure chamber and main control indoor temperature, humidity and entrance guard. Side of 0.4 kV transformer, 0.4 kV bus voltage, current, active power and reactive power, 0.4 kV each branch line current, temperature of transformer. Standby diesel engine generator voltage, current, active power, reactive power, oil pressure, oil temperature, water temperature, battery voltage, etc. A light on-off switch, circuit breaker switch, the outlet and inlet line of high voltage switch, the main transformer tap switch, main transformer low voltage main switch, the section switch, 0.4 kV each branch line switch, diesel generator circuit switch, etc.
Second, the collection of wisdom of the solution:
Hardware implementation
1. The substation the indoor temperature, humidity and entrance guard
Substation withdraw after one thousand substation fire, often because of not found in time and delay the processing of the accident, cause an accident. In addition, when the thieves broke into substation, lack of effective defense. Therefore, in the high pressure chamber and master control room where installed a number of temperature, humidity sensors, and at the gate of the high pressure chamber and master control room to install active infrared intrusion detectors. When the probe sensor to high temperatures or was broken into, can send the alarm information to the background, moving and switch camera images at the same time, and record the current state of the field.
With RS - 6042 - m to collect temperature and humidity sensor signal. Collect 5 sensor signals.
Using the RS - 6011 - m voltage signal acquisition active infrared intrusion detectors, 16 alarm signals can be collected.
2. The transformer
Side of 0.4 kV transformer, 0.4 kV bus voltage, current, active power and reactive power, 0.4 kV each branch line current, monitoring of transformer operation, can make a timely response when the abnormal situation. Choose transformer itself should take control of the protection device, has the perfect temperature testing and fan control function, using the transformer itself provides platinum resistance, transformer coil temperature, if the temperature of the test more than set threshold, the fan has yet to start, the mandatory start fan. Data in the controller by RS485 interface, can also be transmitted to the monitoring center, execution of transformer condition monitoring.
Using the RS - 6021M for collection side of the transformer, bus voltage, piecewise current, active power and reactive power.
Using the RS - 6042M for collection coil temperature.
Using the RS - 6014M for startup and shutdown fan.
3. The motor and the standby diesel engine generator protection:
With the motor current, voltage, temperature measurement as the foundation, provide comprehensive protection for the motor. With short circuit, start timeout, locked-rotor, unbalanced rotor, ground fault over voltage, temperature, load loss, and under-voltage protection, etc. Through the inspection before the start of busbar voltage, trip circuit is normal, the reliability of the system was further improved.
Standby diesel engine generator voltage, current, active power, reactive power, oil pressure, oil temperature, water temperature, battery voltage, etc. Monitoring of transformer operation, can make a timely response when the abnormal situation.
Using RS - 6021M for acquisition of current, voltage of the motor and diesel engine generator voltage, current, active power, reactive power.
Using the RS - 6042M for motor temperature signal.
With RS - 6041M for acquisition hydraulic diesel engine generator, the oil temperature, water temperature.
4. The switch quantity monitoring
(1) to make industrial TV monitoring system can still work in the evening, the lights of the substation should have the function of the time switch or remote control.
(2) a circuit breaker: on or off or failure in operation of the circuit.
(3) the main transformer tap switch, main transformer low voltage side switches, section switch, 0.4 kV line switch, various loops diesel generator circuit switch, RS - 485 serial communication mode. Can through the communication to realize remote control points/closing, remote measurement value, the remote reading on-off state.
Using RS - 6013M to monitor and control switch.
System schematic diagram
Set of wisdom, power monitoring and control system, the I/O data acquisition module
The data communication function
Substation internal circuit monitor the communication between the host and USES RS 485 Modbus RTU protocol, the communication distance can reach 1, 200 m, baud rate can be set to 1200, 2400, 4800, 2400, 4800, 38400, 57600, 38400.
Third, the conclusion
General distributed substation monitoring and control system equipment, maintenance, installation is simple, high reliability, the function is complete, the user easy to use. Via multiple substation and distribution of factories and mines, this paper described in the monitoring system has received the good effect. Do the power monitoring management gradually to automation, integrated, centralized and intelligent direction