CN211124294U - Residual current type electric fire monitoring device - Google Patents

Abstract

The application relates to a residual current formula electric fire monitoring device, including surveillance center, data transmission module, monitoring unit, the surveillance center passes through data transmission module and is connected characterized by with monitoring unit: the monitoring unit is installed to each level switch board side of being qualified for the next round of competitions of distribution system, and the monitoring unit includes monitoring module, actuating mechanism and residual current transformer, and monitoring module all is connected with actuating mechanism, residual current transformer, actuating mechanism is used for switching on and off the working power supply of monitoring unit place circuit or conversion monitoring unit place circuit, and spare circuit is all installed to distribution system's one-level load side, and the surveillance center is provided with the input or the leading-in device of electrical parameter. The actuating mechanism adopts a switch or a circuit converter. The method has the advantages of simple structure, convenience in use, capability of correspondingly adjusting the residual current alarm value after the system architecture, the distribution line and the power utilization equipment are changed, and the like.

Description

Residual current type electric fire monitoring device

Technical Field

The application relates to a residual current type electrical fire monitoring device which is mainly suitable for the field of low-voltage electrical fire monitoring in buildings.

Background

The residual current type electric fire monitoring device based on the kirchhoff current law can give an alarm under the conditions of electric faults and certain electric fire hidden dangers, and is one of effective measures for preventing electric fires.

At present, residual current type electrical fire monitoring devices are applied to low-voltage power distribution networks in a large scale, but factors such as insulation types, laying modes, laying lengths, installation environments, power distribution system architectures, types and numbers of electric equipment and the like of power distribution lines all affect residual currents of the lines, the influence of the factors is not considered in the prior art, and line and system architecture changes caused by decoration, equipment purchase, owner change and the like after equipment installation are not considered, so that false alarms of a plurality of monitoring devices are directly caused, the resetting of alarm values is difficult, alarm signals cannot be eliminated, and an alarm system cannot adapt to the power distribution system architectures, parameters of the power distribution lines and parameters of the electric equipment.

Disclosure of Invention

The technical problem that this application was solved is overcome the above-mentioned not enough that exists among the prior art, and provides a structure succinct, convenient to use, and corresponding electric parameter adjustable's surplus current formula electric fire monitoring device after system architecture, distribution lines and consumer change.

The technical scheme adopted by the application for solving the technical problems comprises the following steps:

the utility model provides a residual current formula electrical fire monitoring device, includes surveillance center, data transmission module, monitor cell, and the surveillance center passes through data transmission module and is connected with the monitor cell, and characterized by distribution system's each level switch board is qualified for the next round of competitions the side and is established the monitor cell, and the monitor cell includes monitor module, actuating mechanism and residual current transformer, and the monitor module all is connected with actuating mechanism, residual current transformer, actuating mechanism is used for switching on and off the circuit of monitor cell place or the working power supply who changes the circuit of monitor cell place (be switch and/or with the circuit converter), and the spare circuit is all installed to distribution system's one-level load side, and the surveillance center is provided with the input or the gatherer of electrical parameter.

The actuating mechanism adopts a switch or a circuit converter.

Compared with the prior art, the application has the following advantages and effects: the structure is simple, the use is convenient, and the residual current alarm value can be correspondingly adjusted after the system architecture, the distribution line and the electric equipment are changed.

Drawings

FIG. 1 is a schematic diagram of a residual current electrical fire monitoring unit configuration of the present application;

FIG. 2 is a schematic view of the topology of the residual current electrical fire monitoring apparatus of the present application;

FIG. 3 is a flow chart of the operation of the residual current type electrical fire monitoring apparatus of the present application;

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of examples, which are illustrative of the present application and are not limited to the following examples.

As shown in fig. 1 and 2, the residual current type electrical fire monitoring apparatus (referred to as monitoring apparatus for short) includes a monitoring center, a data transmission module, and a monitoring unit, wherein the monitoring center is connected with the monitoring unit through the data transmission module, the low-voltage side of the power distribution system adopts a graded power distribution, each power distribution cabinet (more than one power distribution cabinet can be arranged from left to right in fig. 1) is directly connected with the next power distribution cabinet or load, the outlet side of the power distribution cabinet is provided with the residual current type electrical fire monitoring unit (referred to as monitoring unit for short), and the monitoring center is provided with an input or lead-in device of electrical parameters in the prior.

As shown in fig. 2, the residual current type electrical fire monitoring unit is composed of a monitoring module, an actuator and a residual current transformer. The monitoring module is connected with the execution mechanism and the residual current transformer, can provide active or passive action signals for the execution mechanism, can receive data of the residual current transformer and sets an alarm value; the actuating mechanism comprises but is not limited to a shunt release K and a dual power transfer switch ATSE. The monitoring module, the executing mechanism and the residual current transformer can adopt the prior art.

The alarm value of the existing device is usually set manually according to discrete numerical values such as 300mA, 400mA, 500mA and the like, the influence of factors such as the insulation type, the laying mode, the laying length, the installation environment, the power distribution system architecture, the type and the number of electric equipment and the like of a power distribution line on residual current is not considered, and the change of the line and the system architecture caused by decoration, equipment purchase, owner change and the like after equipment installation is not considered.

The plurality of monitoring units are accessed to the data transmission module through the alarm bus, and the data transmission module is accessed to the monitoring center through networking modes such as a private network, a broadband network, L oRaWan, an NB-IoT wireless network or a GPRS/4G mobile data network.

As shown in fig. 3, before the operation of this embodiment, a power distribution system architecture, parameters of a distribution line, and parameters of electric devices (collectively referred to as electrical parameters) need to be input or imported through an input or import device of a monitoring center, where the change of the power distribution system architecture mainly relates to increase, decrease, combination, or separation of the electric devices and lines, and the change of electric properties, and the parameters of the distribution line and the parameters of the electric devices are collected according to the operation condition and updated when the change is large. Usually, when the electrical parameters are changed, the operator on duty should input the embodiment immediately and debug the alarm value.

The alarm setting value of the last stage of monitoring unit is determined according to the following formula:

I_z.1＝k_1.1(I_l.1+I_s.1)

I_l.1representing the residual current of the line in normal operation after the level of monitoring unit;

I_s.1the residual current of the electric equipment after the stage of monitoring unit in normal operation is represented;

k_1.1the sensitivity coefficient is expressed and is generally 2-3;

the alarm setting value of the second last-stage monitoring unit is determined according to the following formula:

I_z.2＝k_2.1(I_l.2+I_s.2) And I_z2≥k₂₂I_z1

In the formula I_l.2Representing the residual current of the line in normal operation after the level of monitoring unit;

I_s.2the residual current of the electric equipment after the stage of monitoring unit in normal operation is represented;

k_2.1the sensitivity coefficient is expressed and is generally 2-3;

k_2.2the selectivity coefficient is generally 1.3;

the alarm setting values of the monitoring units at all levels are analogized, namely

I_z.n＝k_n.1(I_l.n+I_s.n) And I_z.n≥k_n.2I_z.n-1

In the formula I_l.nRepresenting the residual current of the line in normal operation after the level of monitoring unit;

I_s.nthe residual current of the electric equipment after the stage of monitoring unit in normal operation is represented;

k_n.1the sensitivity coefficient is expressed and is generally 2-3;

k_n.2the selectivity coefficient is generally 1.3;

as shown in fig. 3, after setting the alarm values of the residual currents at different levels according to the above principle, the monitoring device enters a debugging state, if there is an alarm in the debugging process, it is necessary to first investigate whether there is an improper installation of the corresponding alarm line, and if there is an alarm after the improper installation is adjusted, the sensitivity coefficient can be adjusted to no alarm at this time.

After the equipment does not give an alarm, the monitoring center can set a scanning period according to the monitoring requirement to enter a monitoring state (inspection type), and each monitoring unit can independently detect respective subordinate lines and equipment (self-checking type).

In the monitoring process, if a monitoring unit self-checks that the alarm setting value of the monitoring unit exceeds the standard, the monitoring unit reports related data to a monitoring center (the monitoring center patrols that the alarm setting value of the monitoring unit exceeds the standard, and in short, the monitoring center obtains an alarm signal of the monitoring unit), the alarm cannot cause a fire immediately, false alarm is avoided through manual processing and judgment, parameter correction is provided for the following monitoring, and an operator on duty in the monitoring center checks whether the power distribution system architecture, the power distribution circuit parameters and the electric equipment parameters (generally in the power utilization record of a power distribution area) are changed. If the relevant electrical parameters are changed and are within a bearable range (namely within a normal fluctuation range, the relevant electrical parameters can be set according to actual conditions and the maximum value of the load), the monitoring center on-duty personnel updates the imported information and resets the residual current alarm values of all levels; if the load level is not changed or exceeds the bearable range, the monitoring center on-duty personnel starts a fault processing flow and carries out fault processing aiming at the load level.

During fault processing, if the load grade of a fault line is three-level load, the data transmission module and the monitoring module control the execution mechanism to cut off an alarm line, continuously send out an alarm signal and wait for manual maintenance; if the load grade of the fault line is a secondary load or a primary load, the dual-power transfer switch ATSE is controlled through the data transmission module and the monitoring module, the working power supply is switched to a non-alarm line, at the moment, if overload occurs due to line switching, the three-level load lines are cut off one by one until the alarm overload is eliminated, the fault processing is quitted, and the scanning monitoring state is returned. The monitoring center display screen can display red alarm information and related positions and electrical parameters (including a monitoring unit where the alarm is located and the electrical parameters), or prompt the alarm information to an operator on duty through an indicator lamp and an alarm lamp, and the related personnel carry out manual overhaul or rescue of the cut (disconnected) line.

All simple variations and combinations of the technical features and technical solutions of the present application are considered to fall within the scope of the present application.

Claims (2)

1. The utility model provides a residual current formula electric fire monitoring device, includes surveillance center, data transmission module, monitor cell, and surveillance center passes through data transmission module and is connected characterized by with monitor cell: the monitoring unit is installed to each level switch board side of being qualified for the next round of competitions of distribution system, and the monitoring unit includes monitoring module, actuating mechanism and residual current transformer, and monitoring module all is connected with actuating mechanism, residual current transformer, actuating mechanism is used for switching on and off the working power supply of monitoring unit place circuit or conversion monitoring unit place circuit, and spare circuit is all installed to distribution system's one-level load side, and the surveillance center is provided with the input or the leading-in device of electrical parameter.

2. The residual current type electrical fire monitoring apparatus according to claim 1, wherein: the actuating mechanism adopts a switch or a circuit converter.

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