Application of electrical fire monitoring system in subway projects

Ren Yunye Ankerui Electric Co.
, Ltd.
Shanghai Jiading [Abstract]: The emergence of the subway can not only meet people's quality requirements for urban life and the actual needs of daily transportation, but also improve the convenience of travel mode while alleviating traffic congestion, so this mode of travel has become an important means
of transportation in people's daily life.

However, as far as the actual situation of the current subway operation is concerned, there will still be a certain probability of fire accidents
.

Based on this, this paper analyzes and applies the effective application of electrical fire monitoring system in subway projects to ensure the safety and reliability
of subway stations.

【Keywords】:Electrical fire monitoring system; Metro; According to the investigation and research, the key causes of fire in the subway mainly include the following aspects: the first is due to the short circuit
of electrical equipment.

For the short-circuit phenomenon, it is mainly caused by the external damage of some insulation layers
.

In this case, once part of the insulation layer of the relevant electrical equipment is damaged, the resistance between the various lines will continue to decline, resulting in an extremely rapid rise
in current.

Under this condition, if the relevant lines are constantly colliding, there will be a spark phenomenon caused by excessive current, which will lead to a rapid increase in the temperature of the relevant electrical equipment, which will cause a fire accident
through the ignition of the electrical equipment.

The second aspect is due to the overload
of the current load.

In the actual operation of the subway, if the current value of the relevant electrical equipment and each line exceeds a certain range, it will lead to the phenomenon of excessive heat of
the electrical equipment.

Once the temperature exceeds a certain limit, it will inevitably ignite through the equipment and insulation materials, resulting in fire accidents
.

The third aspect is that the contact of the relevant lines is poor
.

When the subway is actually running, if there is a certain connection problem between the wires between the related lines, it will generate a large amount of heat at the same time as the overcurrent, resulting in a rapid rise in temperature, which will not only increase the actual resistance of the basic position of each wire, but also cause damage to the insulation layer, resulting in the undesirable phenomenon of short circuit of the equipment and causing fire accidents
.

2.
The application of electrical fire monitoring system in the subway (a) The effective application of residual current type electrical fire monitoring equipment For this type of monitoring equipment in the electrical fire monitoring system, it is mainly through monitoring the current change that occurs when the relevant wires and cables leak, to achieve effective detection
of its insulation state.

In this case, if the relevant electrical equipment in the ground fall has an electrical failure when it is actually running, the location of the fault must be the actual location
of the current entering the earth when it passes through the current transformer.

Based on this, in order to better play the substantial role of this type of monitoring detector, the relevant personnel should effectively install it while reasonably selecting the installation
location.

ARCM type residual current type electrical fire monitoring detector, can effectively detect the residual current transformer in the loop, the detector supports a variety of installation methods of open and closed mouth, which can effectively solve the installation problem
of on-site transformer.

(2) The effective application of temperature-measuring electrical fire monitoring equipment due to the overload of electrical load, will lead to the current overflow of the cable, and the continuous improvement of the current in Jiangsu and Zhejiang, the resistance value of the relevant electrical equipment in the subway is continuing to rise, the temperature is rising, and the effective application of the temperature monitoring detector equipment is to carry out relevant work
on the basis of this operating principle.

For such monitoring detector equipment, it is mainly based on the temperature measurement sensor for practical work, and generally will be installed
in some locations where the heating phenomenon is more obvious and the heat generation probability is relatively high.

For example, cable glands and switch contacts
.

In addition, the relevant departments of the subway will also install such monitoring detector equipment in the contact area of the switch and the base to achieve effective detection
of the use and operation status of the low-voltage distribution equipment.

For example, the total circuit breaker interface of the three-level load
.

Only in this way can we achieve effective monitoring while avoiding accidents
related to electrical fires.

The ARCM type temperature measurement type electrical fire monitoring detector is mainly equipped with the ARCM-NTC type temperature measurement sensor, which can effectively detect
the temperature of the cable.

(III) The effective application of current-limiting protectors With the rapid development of social economy, the degree of social electrification is constantly improving, and electrical fires are becoming more and more frequent due to excessive electricity load and short circuit of lines, which makes the number of fires on the rise, and electrical fires in subway projects are not uncommon
.

In order to prevent the occurrence of electrical fire accidents, low-voltage power distribution systems have generally adopted intelligent electronic equipment and systems to monitor, alarm and control
the electrical lines at the user's site.

However, for circuit short-circuit faults that cause serious electrical fire hazards and account for a relatively large proportion, there is always a lack of effective short-circuit protection means to prevent and relieve faults
.

Acquare's ASCP-type current-limit protectors protect the circuit from short circuits
.

3.
In summary, in order to alleviate the traffic pressure in the current urban life, it is very necessary to carry out the actual construction of the
subway.

As an important part of the actual operation of the subway, the electrical fire monitoring system plays a vital role
in ensuring the safety of the subway operation.

Therefore, only the effective application of the electrical fire monitoring system in the subway can reduce the probability of electrical fire accidents, so that the safe operation of the subway can be guaranteed
.

References:[1].
Bao Hongbing.
Application Analysis of Electrical Fire Monitoring System in Subway[J]Science and Technology Wind,2020(05)[2].
Product Selection Manual of Acquaray Electric Co.
, Ltd.
.
2020.
08[3].
GB50116-2014 Fire code for building design[S].
[4].
GB14287-2014 Electrical fire monitoring system[S].