At present, fire accidents caused by electrical fires have been increasing year by year, and the proportion of fire accidents caused by electrical fires is the largest among all fire accidents that have occurred in recent years in China. Therefore, in order to eliminate the cause or accident caused by this cause, it is mandatory to install a leakage fire alarm system in public places such as buildings, and only the departments at all levels in the country have also revised or revised the corresponding standards and specifications. Based on the relevant standards and design principles of the relevant leakage fire alarm system, the author continuously summarizes and summarizes the design and installation methods of the system, and hopes to better optimize the design and installation method of the leakage fire alarm system, thus speeding up the system in public buildings. Promotion and application in the facility.
Discussion: Problems in designing leakage fire alarm system
1 Design of leakage fire alarm system
The position design of the detection controller <br> Since the "High-rise civil building design fire protection specification" is the architectural design specification, it is not the national standard of the leakage fire alarm system product, not the special leakage fire alarm system design and construction acceptance specification, which affects The smooth construction and operation of the leakage fire alarm system project affects the normal function of its electrical fire monitoring function. The installation and operation of the residual current action protection device has become an important standard for the design and installation of the leakage fire alarm system. At present, it is feasible to implement the "Installation and Operation of Residual Current Action Protection Device" GB13955-2005 and refer to the relevant contents of GB14287-2005 "Electrical Fire Monitoring System". The leakage fire alarm system required by the 2005 edition of the “High-rise Civil Building Design Fire Protection Code†is the “Residual Current Action Electrical Fire Monitoring System†in the “Residual Current Action Protection Deviceâ€, which belongs to the “Installation and Operation of Residual Current Action Protection Deviceâ€. The scope of management of GB13955-2005.
Distribution of leakage alarm controller <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> GB13955-2005 Determine the appropriate protection range, the predetermined residual current action value and the action time, and meet the operational characteristics requirements of the hierarchical protection to reduce the power failure range caused by the faulty power supply.
In order to avoid fire accidents caused by electrical problems, the GB13955-2005 standard emphasizes that in order to prevent the occurrence of large-scale blackouts, it is necessary to coordinate the residual current protection at the end. The operational characteristics of the residual current protection device in the device and the power supply branch line to complete the hierarchical protection of the action selection function. Install the secondary detection controller in the secondary switch of each branch power distribution cabinet. Pay attention to the parameters of the residual current detector and the three-phase current detector when installing. It is preferred to use a four-in-one (combined three current detector and one residual current detector) detector as the current and residual current detector. In general, the model of the 4-in-1 current detector can be assembled with the specifications of the distribution box molded case circuit breaker. At the same time, in order to match the control function of the low-voltage power distribution system with the leakage fire alarm system, it is recommended to use a circuit breaker shunt trip device with a tripping DC voltage of 24V. In addition, it has the functions of detecting and alarming the residual current and providing multi-function expansion, which is an obvious feature of the multi-function leakage switch. It can also have leakage, phase loss, short circuit, overload, over voltage, delay power transmission, and owed. Pressure, anti-missing and remote centralized monitoring, so it can be seen that it has many protection items, the built-in current transformer has fewer connectors and easy operation; but its disadvantages are also obvious, such as complex structure and high faults. The rate and product range are small. The working principle of the electrical fire monitoring equipment and the electrical fire monitoring detector is that the current in the distribution box is sampled by the detector, and the leakage current signal is analyzed and processed by the built-in single-chip system, and then the centralized controller in the fire control system receives This signal ultimately drives the trip unit to shut off the power. The system has an independent power distribution system. The control of tripping and sampling signals can only be passed through the transformer, the power control switch can be cancelled, and the application range is wide, and the old and new projects are applicable.
2 Problems that should be paid attention to during installation of leakage fire alarm system
The main unit of leakage fire alarm system construction <br> The characteristics of the leakage fire alarm system determines that it has certain independence, but it is inseparable from the power distribution system. It is easier to coordinate and cooperate with the construction of the power system. If it is classified into the construction unit of the fire alarm system, it is prone to wrangling, coordination and cooperation difficulties, and its unfamiliarity with the control cabinet, the installation of transformers is relatively unfamiliar, and the construction quality is difficult to guarantee. For the two-bus leakage fire alarm system that directly uses the ordinary fire alarm system, it can be incorporated into the construction unit of the fire alarm system under the premise of full communication and cooperation with the complete set of manufacturers or construction units of the power distribution cabinet. At present, the fire department is not clearly defined whether the construction unit of the leakage fire alarm system needs to have the qualification for fire protection professional contracting.
Construction requirements for leakage fire alarm system <br> The installation of residual current protection device should fully consider the power supply mode, power supply voltage, system grounding type and protection mode. The form of the residual current protection device, rated voltage, rated current, short-circuit breaking capacity, rated residual operating current, and breaking time shall meet the requirements of the protected line and electrical equipment, and shall be correctly wired in different system grounding forms. The installation of the leakage fire alarm system should pay attention to the following problems: (1) When the leakage current alarm is marked with the power supply side and the load side, the wiring should be installed as specified, and cannot be reversed. (2) When installing a leakage current circuit breaker, there should be sufficient arcing distance in the direction of arc discharge. (3) During installation, the N-line and PE-line must be strictly distinguished. The N-line of the three-stage four-wire or four-pole four-wire type should pass the current mutual inductance detector of the leakage fire monitoring system. The N line must not be used as a PE line. The PE line must not be connected to the residual current protection device. (4) The centralized controller set up by the fire center and the electrical fire monitoring detector installed on site shall be connected to the fire power. (5) When the leakage fire alarm system is constructed by the fire alarm automatic construction unit, both the power distribution system construction unit and the automatic alarm construction unit should fully communicate and coordinate the relevant installation methods, dimensions and electrical technical parameters. (6) The installation of the current mutual inductance detector of the leakage fire alarm system in the power distribution cabinet, pay special attention to the construction under the condition of cutting off the power supply, and pay attention to the separate lines of strong and weak electricity, and the detector signal line should use more shielding. The core control line is laid separately. Care must be taken to prevent misconnection or wiring, so as not to burn the fire monitoring detector or other fire monitoring detectors connected to it.
3 Conclusion <br> In summary, the leakage fire alarm system has emerged as a new type of electrical fire protection device in the field of construction in recent years, and its application has been widely promoted. It is playing an increasingly important role in the field of electrical fire prevention. . All parties involved in the project should strengthen communication, coordination and communication, so that the design and application of the leakage fire alarm system can be closely combined; the fire prevention function of the leakage fire alarm system is continuously improved, making it more widely used.
Discussion: Problems in designing leakage fire alarm system
1 Design of leakage fire alarm system
The position design of the detection controller <br> Since the "High-rise civil building design fire protection specification" is the architectural design specification, it is not the national standard of the leakage fire alarm system product, not the special leakage fire alarm system design and construction acceptance specification, which affects The smooth construction and operation of the leakage fire alarm system project affects the normal function of its electrical fire monitoring function. The installation and operation of the residual current action protection device has become an important standard for the design and installation of the leakage fire alarm system. At present, it is feasible to implement the "Installation and Operation of Residual Current Action Protection Device" GB13955-2005 and refer to the relevant contents of GB14287-2005 "Electrical Fire Monitoring System". The leakage fire alarm system required by the 2005 edition of the “High-rise Civil Building Design Fire Protection Code†is the “Residual Current Action Electrical Fire Monitoring System†in the “Residual Current Action Protection Deviceâ€, which belongs to the “Installation and Operation of Residual Current Action Protection Deviceâ€. The scope of management of GB13955-2005.
Distribution of leakage alarm controller <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> GB13955-2005 Determine the appropriate protection range, the predetermined residual current action value and the action time, and meet the operational characteristics requirements of the hierarchical protection to reduce the power failure range caused by the faulty power supply.
In order to avoid fire accidents caused by electrical problems, the GB13955-2005 standard emphasizes that in order to prevent the occurrence of large-scale blackouts, it is necessary to coordinate the residual current protection at the end. The operational characteristics of the residual current protection device in the device and the power supply branch line to complete the hierarchical protection of the action selection function. Install the secondary detection controller in the secondary switch of each branch power distribution cabinet. Pay attention to the parameters of the residual current detector and the three-phase current detector when installing. It is preferred to use a four-in-one (combined three current detector and one residual current detector) detector as the current and residual current detector. In general, the model of the 4-in-1 current detector can be assembled with the specifications of the distribution box molded case circuit breaker. At the same time, in order to match the control function of the low-voltage power distribution system with the leakage fire alarm system, it is recommended to use a circuit breaker shunt trip device with a tripping DC voltage of 24V. In addition, it has the functions of detecting and alarming the residual current and providing multi-function expansion, which is an obvious feature of the multi-function leakage switch. It can also have leakage, phase loss, short circuit, overload, over voltage, delay power transmission, and owed. Pressure, anti-missing and remote centralized monitoring, so it can be seen that it has many protection items, the built-in current transformer has fewer connectors and easy operation; but its disadvantages are also obvious, such as complex structure and high faults. The rate and product range are small. The working principle of the electrical fire monitoring equipment and the electrical fire monitoring detector is that the current in the distribution box is sampled by the detector, and the leakage current signal is analyzed and processed by the built-in single-chip system, and then the centralized controller in the fire control system receives This signal ultimately drives the trip unit to shut off the power. The system has an independent power distribution system. The control of tripping and sampling signals can only be passed through the transformer, the power control switch can be cancelled, and the application range is wide, and the old and new projects are applicable.
2 Problems that should be paid attention to during installation of leakage fire alarm system
The main unit of leakage fire alarm system construction <br> The characteristics of the leakage fire alarm system determines that it has certain independence, but it is inseparable from the power distribution system. It is easier to coordinate and cooperate with the construction of the power system. If it is classified into the construction unit of the fire alarm system, it is prone to wrangling, coordination and cooperation difficulties, and its unfamiliarity with the control cabinet, the installation of transformers is relatively unfamiliar, and the construction quality is difficult to guarantee. For the two-bus leakage fire alarm system that directly uses the ordinary fire alarm system, it can be incorporated into the construction unit of the fire alarm system under the premise of full communication and cooperation with the complete set of manufacturers or construction units of the power distribution cabinet. At present, the fire department is not clearly defined whether the construction unit of the leakage fire alarm system needs to have the qualification for fire protection professional contracting.
Construction requirements for leakage fire alarm system <br> The installation of residual current protection device should fully consider the power supply mode, power supply voltage, system grounding type and protection mode. The form of the residual current protection device, rated voltage, rated current, short-circuit breaking capacity, rated residual operating current, and breaking time shall meet the requirements of the protected line and electrical equipment, and shall be correctly wired in different system grounding forms. The installation of the leakage fire alarm system should pay attention to the following problems: (1) When the leakage current alarm is marked with the power supply side and the load side, the wiring should be installed as specified, and cannot be reversed. (2) When installing a leakage current circuit breaker, there should be sufficient arcing distance in the direction of arc discharge. (3) During installation, the N-line and PE-line must be strictly distinguished. The N-line of the three-stage four-wire or four-pole four-wire type should pass the current mutual inductance detector of the leakage fire monitoring system. The N line must not be used as a PE line. The PE line must not be connected to the residual current protection device. (4) The centralized controller set up by the fire center and the electrical fire monitoring detector installed on site shall be connected to the fire power. (5) When the leakage fire alarm system is constructed by the fire alarm automatic construction unit, both the power distribution system construction unit and the automatic alarm construction unit should fully communicate and coordinate the relevant installation methods, dimensions and electrical technical parameters. (6) The installation of the current mutual inductance detector of the leakage fire alarm system in the power distribution cabinet, pay special attention to the construction under the condition of cutting off the power supply, and pay attention to the separate lines of strong and weak electricity, and the detector signal line should use more shielding. The core control line is laid separately. Care must be taken to prevent misconnection or wiring, so as not to burn the fire monitoring detector or other fire monitoring detectors connected to it.
3 Conclusion <br> In summary, the leakage fire alarm system has emerged as a new type of electrical fire protection device in the field of construction in recent years, and its application has been widely promoted. It is playing an increasingly important role in the field of electrical fire prevention. . All parties involved in the project should strengthen communication, coordination and communication, so that the design and application of the leakage fire alarm system can be closely combined; the fire prevention function of the leakage fire alarm system is continuously improved, making it more widely used.
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