3.1MOQF2 general provisions of electrical fire monitoring
3.1.1 Electrical fire monitoring system in engineering applications should be configured independently, and it is desirable as a sub-system of the automatic fire alarm system, to undertake the monitoring and alarm task of the fire before the occurrence of fire, the electric power system itself may cause fire.
3.1.2 Electrical fire monitoring system on-site devices should be independent system components.
3.1.3 Monitoring system of the electrical fire monitor should be panel instrumentation type structure, all displays, operations should be carried out in the panel of the distribution box cabinet.
3.1.4 Monitoring system host should have a real-time graphic display function, the graphics system should be able to display the electrical fire monitoring system map, the graphics displayed, should be able to display the electrical fire alarm part of the signal and control status signals, real-time monitoring of the alarm and the system failure alarm, online query, set and modify the relevant parameters of the monitoring node.
3.1.5 Electrical fire monitoring system should have a warning function, can be monitored in the parameter abnormalities but did not reach the monitoring alarm value before the pre-alarm signal.
3.1.6 monitoring nodes less than 20 points of small-scale projects may not configure the host and the system bus, it is appropriate to use the independent monitor or monitor the detector, and through the automatic fire alarm system signal module (input module) will monitor the node signals into the automatic fire alarm system.
3.1.7 The system design should be based on leakage monitoring and protection, it is appropriate to configure overcurrent monitoring and protection.
3.1.8 System temperature monitoring should be based on detecting the ambient temperature in the distribution box cabinet, it is not appropriate to detect the switch in and out of the copper terminal temperature method.
3.1.9 Electrical fire monitoring system design and configuration should meet the requirements of safe, reliable and affordable.
3.2 System Configuration
3.2.1 With automatic fire alarm system for new construction, expansion or alteration of the project should be configured accordingly with the electrical fire monitoring system, electrical fire monitoring system should be configured in accordance with the current national standards, "Automatic Fire Alarm System Design Code," GB 50116 of the system to determine the protection of the object grading, and at the same time should be consistent with the current national standards, "Design Code for High-rise Civil Buildings Fire Protection," GB 50116 of the system protection object grading requirements, and should be consistent with the current national standards. At the same time, it should be consistent with the current national standard "Code for Fire Protection in the Design of High-rise Civil Buildings" GB50045-95 and "Code for Electrical Design of Civil Buildings" JGJ 16-2008 relevant provisions.
3.2.2 Electrical fire monitoring system should be set up in accordance with the relevant provisions of the current national standard "Code for Electrical Design of Civil Buildings" JGJ 16-2008, and monitoring node as a unit in the following power lines or equipment configuration:
a. Special protection object of the substation low-voltage distribution of the important outgoing circuit;
b. Floor or fire zoning
f. The main switch of the power distribution box for important fire fighting loads such as fire fighting pumps, fire fighting fans, fire fighting elevators, etc.
g. The main switch of the power distribution box for passenger and freight elevators;
h. The main switch of the general power trunk distribution box for air conditioners, fans, etc. of the objects of special protection;
i. The main switch of the medical power trunk and end distribution equipment of the medical buildings;
j. The main switch of the power distribution equipment for the brick, wood or other buildings of national-level cultural relics protection units;
j. The main switch for the medical power supply of the medical buildings. The master switch of power trunk and end distribution box of key ancient buildings of brick or wood structure of national-level cultural relics protection units;
k. Other places with high fire risk that need to be configured with monitoring nodes (such as kitchens, hot beverage processing and other power distribution equipment).
3.2.3 In the event of accidents still need to maintain the power supply of fire fighting equipment, emergency lighting and other special power lines that do not allow power outages, should be set up only alarm does not output a debugging command alarm-type monitoring node.
3.2.4 The monitoring node located in the same distribution box cabinet at the head of the multi-channel distribution trunk line should be used with multi-loop monitoring products. Multi-loop monitoring should be able to realize the monitoring parameters display, operation, setting and alarm functions of multiple distribution circuits on a **** monitor.
3.2.5 leakage monitoring and protection design is generally appropriate to use the design principle of the alarm does not trip, only in the fire danger or must immediately cut off the power supply to protect the safety of the place can be used to monitor the alarm output trip signal mode. Overcurrent and temperature monitoring alarm should not be linked to the main switch trip.
3.2.6 Electrical fire monitoring system monitoring host should be set up in the fire control room or fire watch room, and it is desirable to form a sub-system through the host communication interface with the automatic fire alarm system connected.
3.3 Parameter Configuration
3.3.1 Monitoring node leakage current (residual current) set value determination:
3.3.1.1 The system design of the monitoring node leakage current set value should be given to the design of the first estimated value, in the commissioning of the system can be based on the real-time leakage current monitor parameters to amend the leakage current set value.
3.3.1.2 The leakage current action setting value at the monitoring node should be not less than 4 times the sum of the normal leakage current values of the monitored lines and equipment.
3.3.2 The output signal of leakage current action release at the monitoring node of hierarchical protection shall take the following time matching requirements into consideration:
3.3.2.1 The end protection shall be instantaneous type.
3.3.2.2 There shall be a delay time of not less than 0.5 seconds between the upper and lower levels of protection.
3.4 Application in different ways of grounding protection
3.4.1 Residual current action protection (leakage monitoring) in the electrical fire monitoring system should be correctly matched with the way of grounding protection of the engineering power system.
3.4.2 Leakage monitoring nodes should be installed in accordance with the requirements of the different grounding methods listed in Appendix 2.
3.4.3 TN-C grounding system can not be installed leakage monitoring node, such as the need to install the system grounding protection must be transformed into TN-C-S system or local TT system.