Electrical Fire Monitoring Emergency

Application Overview
The working principle of the electrical fire monitoring system is as follows: when an electrical fault occurs, the electrical fire monitoring detector will convert the information of the residual current, temperature, arc fault and other electrical fault parameters in the line into electrical signals. After data processing, the detector will send out an alarm signal and transmit the alarm information to the electrical fire monitor. Once the electrical fire monitor receives the alarm information from the detector, it will carry out confirmation and judgment, display the location information of the electrical fault alarm detector and record the alarm time. At the same time, it will trigger the audible and visual alarm devices installed at the site of the protected area to emit audible and visual alarms to remind personnel to take necessary measures to troubleshoot electrical faults and eliminate the risk of electrical fires in order to prevent electrical fires from occurring.

Electrical fire monitoring system application overview:
Electrical fire monitoring system is applicable to places with electrical fire risk, especially those important places where power supply cannot be interrupted, such as substations, petroleum and petrochemical, metallurgy and so on. The system can be used to monitor electrical faults and send out alarm signals in case of electrical fire hazards to alert professionals to take measures to eliminate the potential risk of electrical fires, and to realize early prevention of electrical fires so as to avoid the occurrence of fires.

Electrical fire monitoring system function:
According to GB14287-2005 "Electrical fire monitoring system part: electrical fire monitoring equipment" standard, the electrical fire monitoring system should have the following functions:
General Requirements:
1. The main power supply is 220V, 50Hz AC and power cord input terminals are provided.
2. The device should be equipped with protective grounding terminal.
3. Equipment function labeling and information display should be in Chinese.

Monitoring alarm function:
1. The monitoring equipment can receive the monitoring alarm signal from the detector and send out the sound and light alarm signal within 30 seconds to indicate the alarm part and record the alarm time until it is reset manually.
2. The alarm sound signal can be canceled manually and should be able to start again when the alarm occurs again.
Control output function:
1. The monitoring equipment shall provide control output for controlling the protected line under the alarm state, and the capacity, quantity and parameters of its output contacts shall be described in the relevant technical documents.
2. The monitoring equipment can set up control outputs for energizing and de-energizing electrical equipment, and each control output should have corresponding manual direct control buttons (keys).
3. The same control output contact should not be used to control the internal and external circuits of the alarm monitoring equipment at the same time.
Fault alarm function:
1. When the following faults occur in the monitoring equipment, it should be able to issue an acoustic and optical fault signal within 100 seconds that is significantly different from the monitoring alarm signal:
   a. The connection line between the monitoring equipment and the detector is broken or short-circuited;
   b. Under-voltage of the main power supply of the monitoring equipment;
   c. The connection line between the charger and the backup power supply is broken or short-circuited;
   d. disconnection or short-circuit of the connection between the backup power supply and its load.
   For class a fault, the fault part shall be indicated; for class b, c and d fault, the fault type shall be indicated.
2. The acoustic fault signal shall be manually cancelable and shall be able to be activated again when the fault signal reappears; the optical fault signal shall continue until the fault is removed.
3. During the fault period, the normal operation of non-faulty circuits shall not be affected.

Self-test function:
1. The monitoring equipment should be able to self-test its own functions. During the self-test period, the controlled external devices and output contacts shall not operate. If the self-test time of the monitoring equipment exceeds 1 minute or the self-test function cannot be stopped automatically, the alarm function of the non-self-tested parts shall not be affected.
2. The monitoring equipment shall allow manual checking of the functions of all indicators and displays on its panel.
Power supply function:
1. The monitoring equipment shall have a main and backup power switching device. When the main power supply is interrupted, it should be able to automatically switch to the backup power supply; when the main power supply is restored, it should be able to automatically switch back to the main power supply. The working status of the main and backup power supply should be indicated, and the main power supply should have over-current protection measures. The capacity of the main power supply shall be able to work continuously for 4 hours under the following load conditions:
   a. When all circuits are in alarm state, the capacity of monitoring equipment does not exceed 10 circuits of individual parts;
   b. When the capacity of the monitoring equipment exceeds 10 circuits, 20% of the circuits (not less than 10 circuits but not more than 30 circuits) are in alarm condition.
2. The monitoring equipment shall operate normally when its supply voltage varies within 85% to 110% of the rated voltage (220V).

Operation Levels:
The monitoring device shall have at least two operating levels for canceling audible alarm signals and querying information. Access to an operating level higher than the first shall require the use of a key or an operating code. The key or code used to access the higher operating level may also be used to access the lower operating level, but the key or code used for the lower operating level shall not be used to access the higher operating level.