CN201707753U - Combined-type electrical fire monitoring detector of residual current and temperature - Google Patents

Abstract

The utility model relates to a combined electrical fire monitoring detector for residual current and temperature, comprising a temperature sensing module, a residual current transformer module, a voltage source module, a power-down storage module, a signal pickup module, a low-pass filter module, Central processing unit, button module, LED display module, LED indication module, sound and light alarm module, protection output module, communication module, power supply module, the temperature sensing module, residual current transformer module, voltage source module and signal The pick-up module is connected, the signal pick-up module is connected with the low-pass filter module, and the central processing unit is respectively connected with the power-down storage module, the low-pass filter module, the button module, the LED display module, the LED indicator module, the acousto-optic Alarm module, protection output module and communication module are connected. Compared with the prior art, the utility model has the advantages of small size, convenient installation and viewing, flexible preparation, convenient upgrading and transformation of the original system, high integration and high reliability.

Description

A Combined Electric Fire Monitoring Detector of Residual Current and Temperature

technical field

The utility model relates to a fire monitoring detector, in particular to a combined electrical fire monitoring detector of residual current and temperature.

Background technique

With the rapid growth of my country's national economy, the electricity consumption of various industries has increased significantly, and electrical fires have also shown an increasing trend year by year, causing serious damage to the country and people's life and property safety. Due to the increase in the use time of the power line, or the long-term overload and overvoltage operation of the power line, the line will appear aging to varying degrees, which will lead to leakage and induce electrical fires. At the same time, leakage will lead to aging of line insulation, so that hidden dangers will grow from small to large, a vicious circle. The final cause of the fire is mostly temperature, and due to poor connection, overload and other reasons, the temperature of the cable and its joints is very easy to rise too high. Therefore, effective control of electrical fires caused by leakage, overtemperature and other factors is very important to the current fire protection work. "Code for Fire Protection Design of High-Rise Civil Buildings" (GB50045-2005) regulates the occasions where leakage fire alarm systems need to be installed to prevent electrical fires.

At present, the latest fire detectors generally have the following problems: 1: Most of the existing fire detectors have relatively single functions and relatively rigid configurations, such as special measurement of residual current, temperature or smoke, and low integration. It is better to measure several channels of residual current, with one channel of temperature monitoring, but in the case where there are many temperature measurement points in a single place, or where there are special requirements for combination of temperature measurement and leakage monitoring, this kind of detector is also powerless and relatively one-sided. 2: Since the fire alarm, the circuit breaker and the fire detector are all packaged together, the volume is very large, which makes the switch cabinet also increase, which is not convenient for the transformation and upgrading of the old system, and it is not easy to work because it is installed inside the switch cabinet Personnel check the working status and operation. In addition, due to the size limitation of the circuit breaker, it cannot meet the requirements in the case of high current, and the configuration is not flexible. 3: Now there are also special devices for measuring multi-channel temperature and multi-channel residual current, but there is a lack of combined detectors. To achieve the effect of several channels of residual current and several channels of temperature detection, two detectors must be selected at the same time , causing two inconveniences: first, a larger installation space is required; second, it is difficult to select a detector type that just meets the measurement number requirements, resulting in a waste of cost.

Contents of the invention

The purpose of this utility model is to overcome the defects of the above-mentioned prior art and provide a residual current system with small volume, convenient installation and viewing, flexible preparation, convenient upgrading of the original system, high integration and high reliability. Combined electrical fire monitoring detector with temperature.

The purpose of this utility model can be achieved through the following technical solutions:

A combined electrical fire monitoring detector for residual current and temperature, characterized in that it includes a temperature sensing module, a residual current transformer module, a voltage source module, a power-down storage module, a signal pickup module, a low-pass filter module, Central processing unit, button module, LED display module, LED indication module, sound and light alarm module, protection output module, communication module, power supply module, the temperature sensing module, residual current transformer module, voltage source module and signal The pick-up module is connected, the signal pick-up module is connected with the low-pass filter module, and the central processing unit is respectively connected with the power-down storage module, the low-pass filter module, the button module, the LED display module, the LED indicator module, the acousto-optic Alarm module, protection output module and communication module are connected.

If the number of temperature measurement channels is x and the number of leakage measurement channels is y, under the condition of x+y=4, any 4 channels of the temperature sensing module channel and the residual current transformer module channel can be connected to the signal pickup module.

The power supply module is provided with a rectification circuit, the input end of the rectification circuit is connected to the AC power supply, and the output end is respectively connected to the temperature sensing module, the residual current transformer module, the voltage source module, the power-down storage module, the signal pickup module, the low-pass The filter module, the central processing unit, the button module, the LED display module, the LED indication module, the sound and light alarm module, the protection output module, and the communication module are connected.

Compared with the prior art, the utility model has the following advantages:

1) The utility model adopts embedded installation, and still maintains a small volume under the condition of realizing all functions, which is very convenient for installation and inspection.

2) This utility model adopts the method that the circuit breaker is placed outside and selected by the user. The configuration is very flexible, which can meet the needs of different applications and facilitate the upgrading of the original system.

3) The function combination of the utility model is reasonable, the number of temperature and residual current monitoring channels can be flexibly configured, and the requirements of on-site installation are considered to the greatest extent, and the integration degree is high.

4) The utility model can flexibly set the alarm parameters according to the actual situation of the user, and can set the alarm threshold and action delay time, so that the device can be adapted to different application occasions, and truly realize that the device does not malfunction or refuse to operate.

5) The utility model can not only detect the temperature of the line contact in real time, but also monitor the temperature of the cable, and can also measure the temperature of the power distribution cabinet or the environment, and truly realize the three-dimensional temperature measurement other than the leakage monitoring. And it can detect whether the temperature sensor is disconnected online, and make a wiring error indication. The protection function failure caused by sensor failure can be prevented, and the reliability of the detector can be further improved.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

As shown in Figure 1, a combined electrical fire monitoring detector for residual current and temperature includes a temperature sensing module 1, a residual current transformer module 2, a voltage source module 3, a power-down storage module 4, and a signal pickup module 5 , low-pass filter module 6, central processing unit 7, key module 8, LED display module 9, LED indication module 10, sound and light alarm module 11, protection output module 12, communication module 13, power supply module 14, described temperature Sensing module 1, residual current transformer module 2, voltage source module 3 are respectively connected with signal pick-up module 5, and described signal pick-up module 5 is connected with low-pass filter module 6, and described central processing unit 7 is connected with drop-off module respectively The electrical storage module 4, the low-pass filter module 6, the button module 8, the LED display module 9, the LED indication module 10, the sound and light alarm module 11, the protection output module 12, and the communication module 13 are connected. The communication module 13 is provided with an RS485 communication interface. The power supply module 14 is provided with a rectification circuit, the input end of the rectification circuit is connected to the AC power supply, and the output end is respectively connected to the temperature sensing module 1, the residual current transformer module 2, the voltage source module 3, the power-down storage module 4, the signal The pickup module 5, the low-pass filter module 6, the central processing unit 7, the button module 8, the LED display module 9, the LED indicator module 10, the sound and light alarm module 11, the protection output module 12, and the communication module 13 are connected. The signal pickup module 5 can be programmed by hardware. The number of temperature measurement channels is set to x, and the number of leakage measurement channels is set to y. Under the condition of x+y=4, it can be arbitrarily configured by hardware and corresponding by software.

Wherein, the central processing unit 7 processes and analyzes various signals input by corresponding modules and transmits corresponding outputs to corresponding modules, so as to realize various functions of the device. The residual current transformer module 2 converts the residual current signal into a smaller secondary signal through the residual current transformer. The temperature sensing module 1 converts the node temperature into a resistance signal. The signal pickup module 5 can be flexibly configured to pick up several leakage signals and temperature sensing signals. The low-pass filter module 6 filters the signal sent by the pickup circuit to filter out interference. The voltage source module 3 is used for lifting and conditioning the residual current signal, and also provides a reference source for the resistance measurement of the temperature sensor. The power-off storage module 4 provides data storage services for the device, and can still save fault records and basic setting information after power-off. The button module 8 is convenient for the staff to set and operate the device to realize human-computer interaction. The LED display module 9 provides real-time data display for the staff at the detector site, which is convenient for the staff to view information and perform human-computer interaction. The LED indicating module 10 simply and intuitively reflects the operating status of the device, the communication status and the fault status of the line. The sound and light alarm module 11 is convenient for the staff to find the fault point at the first time when a fault occurs. The protection output module 12 handles faults according to the previous settings, and realizes remote alarm transmission and tripping protection; general electrical equipment that requires safety and reliability can adopt a tripping protection method to directly cut off the power supply and give an alarm notification; And in the case that it is not suitable for power failure or important electrical equipment, the relay output closing method can be used, so that the leakage and temperature status can be monitored in time through the host computer without cutting off the power supply. The communication module 13 has communication based on the MODBUS-RTU protocol of RS485. The power module converts the AC power into multiple DC power sources to provide working power for each module of the whole device.

After the measured residual current and temperature channels are determined, the corresponding components of the signal pickup module 5 can be removed to meet the requirements. After the residual current signal is isolated and adjusted by the transformer, it enters the signal pickup module 5, and after being filtered by the low-pass filter module 6, it is sent to the central processing unit 7, and the central processing unit 7 further processes the received data. Afterwards, it is compared with the protection parameters set before to judge whether there is a fault, and the data is displayed on the LED display module 9 in real time. If a failure occurs, it will be processed according to the previously set failure handling method, and the sound and light alarm module 10 will be triggered to notify the staff. For temperature, it is powered by the internal voltage source module 3, and the external temperature sensing module 1 is sent to the central processing unit 7 through the signal pickup module 5, and the central processing unit 7 performs further processing to obtain the temperature value and compare it with the set value , overrun then carry out acousto-optic and relay alarm, and according to the processing situation of button module 8, decide whether to display the temperature value on the LED display module 9. The central processing unit 7 can exchange data with the upper computer system through the communication module 13, which is convenient for the upper computer to monitor the device. The central processing unit 7 performs human-computer interaction through the key module 8 and the LED display module 9, changes the setting content, and saves the setting content in a memory chip that is not lost when power is turned off.

Claims (3)

1. A combined electrical fire monitoring detector for residual current and temperature, characterized in that it comprises a temperature sensing module, a residual current transformer module, a voltage source module, a power-down storage module, a signal pickup module, and a low-pass filter module, central processing unit, button module, LED display module, LED indication module, sound and light alarm module, protection output module, communication module, power supply module, the temperature sensing module, residual current transformer module and voltage source module respectively Connected with the signal pickup module, the signal pickup module is connected with the low-pass filter module, and the central processing unit is respectively connected with the power-down storage module, the low-pass filter module, the button module, the LED display module, the LED indicator module, Sound and light alarm module, protection output module and communication module are connected. 2. The combined electric fire monitoring detector of a kind of residual current and temperature according to claim 1, is characterized in that, if the temperature measurement channel number is x, the leakage measurement channel number is y, at x+y=4 Under certain conditions, any four channels of the temperature sensing module channel and the residual current transformer module channel can be connected to the signal pickup module. 3. A combined electrical fire monitoring detector for residual current and temperature according to claim 1, wherein said power supply module is provided with a rectifier circuit, the input end of the rectifier circuit is connected to an AC power supply, and the output end Respectively with temperature sensing module, residual current transformer module, voltage source module, power failure storage module, signal pickup module, low-pass filter module, central processing unit, button module, LED display module, LED indicator module, sound and light alarm Module, protection output module, communication module connection.

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