CN202662125U - Electrical fire detector - Google Patents
Electrical fire detector Download PDFInfo
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- CN202662125U CN202662125U CN 201220256312 CN201220256312U CN202662125U CN 202662125 U CN202662125 U CN 202662125U CN 201220256312 CN201220256312 CN 201220256312 CN 201220256312 U CN201220256312 U CN 201220256312U CN 202662125 U CN202662125 U CN 202662125U
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Abstract
The utility model discloses an electrical fire detector, comprising a processor, a positive residual current detection interface, a negative residual current detection interface, a positive temperature measurement interface and a negative temperature measurement interface. The positive residual current detection interface and the negative residual current detection interface are used to be connected with two leads of a residual current transformer respectively; the positive residual current detection interface and the negative residual current detection interface are connected with the processor through an RS485 bus; and the positive temperature measurement interface and the negative temperature measurement interface are used to be connected with two leads of a temperature sensor respectively. Whether a cable through which all load currents run occurs electric leakage or not and what the magnitude of a leakage current is can be accurately known, and the condition of a line can be timely known by reading the temperature sensor installed at supervision positions of being near the cable, etc. When the leakage current or a detection temperature exceeds a certain value, an audible-visual alarm alarms, and corresponding information can be sent to a supervision computer through an RS485 bus interface, a CAN bus interface, an Ethernet interface, etc.
Description
Technical field
The utility model relates to a kind of electrical fire-detector.
Background technology
In fact existing earth leakage protective device is exactly on the basis of general automatic air-break switch, has increased zero sequence current mutual inductor and leakage tripping device and has detected the electric leakage situation.It uses fixing pattern to measure the leakage current of certain limit, does not have accurate measured value, and too small when leakage current, it can not react, and its defencive function is single, and sensitivity is low, and precision is not enough, produces easily misoperation.
Summary of the invention
In order to overcome the deficiencies in the prior art, the utility model provides a kind of electrical fire-detector, to improve sensitivity and monitoring range and the ability of electrical fire-detector.
A kind of electrical fire-detector, comprise processor, positive residual current detection interface and negative residual current detection interface, described positive residual current detection interface be connected the residual current detection interface and be respectively applied to be connected with two lead-in wires of residual current transformer, positive residual current detection interface be connected the residual current detection interface and be connected with processor by the RS485 bus.
Preferably, comprise that also positive temperature detection interface and negative temperature detect interface, described positive temperature detection interface is connected interface and is respectively applied to be connected with two lead-in wires of temperature sensor with negative temperature, described positive temperature detection interface is connected with described processor by the RS485 bus.
Preferably, also comprise wireless receiving module, described temperature sensor is radio temperature sensor, and described wireless receiving module is connected with processor by the RS485 bus, and described processor receives the data of temperature sensor by wireless receiving module.
Preferably, also comprise signal acquisition circuit, low-pass filter circuit and A/D change-over circuit, described positive temperature detection interface is connected with the RS485 bus with the A/D change-over circuit by signal acquisition circuit, low-pass filter circuit successively.
Preferably, also comprise the first photoelectric isolating circuit, the second photoelectric isolating circuit, data buffer circuit and data-latching circuit, the RS485 bus is connected with the second photoelectric isolating circuit by data buffer circuit, the first photoelectric isolating circuit, data-latching circuit successively.
Preferably, also comprise RS485 bus interface, CAN bus interface, Ethernet interface and the Wi-Fi interface that is connected with external unit.
Preferably, comprise that also positive A phase current detects interface, negative A phase current detects interface, positive B phase current detects interface, negative B phase current detects interface, positive C phase current detects interface and negative C phase current detects interface, positive A phase current detects interface and is connected the A phase current and detects interface and be respectively applied to be connected with two A phase currents lead-in wires of current transformer, positive B phase current detects interface and is connected the B phase current and detects interface and be respectively applied to be connected with two B phase currents lead-in wires of current transformer, and positive C phase current detects interface and is connected the C phase current and detects interface and be respectively applied to go between with two C phase currents of current transformer and be connected.
Preferably, also comprise N phase electrical interface for the A phase voltage that is electrically connected with A detects interface, the B phase voltage that is used for being electrically connected with B detects interface, the C phase voltage that is used for being electrically connected with C detects interface and is used for being electrically connected with N.
Preferably, comprise also for the smoke transducer interface that is connected with smoke transducer that the smoke transducer interface is connected with processor by the RS485 bus.
Preferably, also comprise for the audible-visual annunciator interface that is connected with audible-visual annunciator.
The beneficial effects of the utility model are: owing to adopt processor to read the electric current of residual current transformer, whether cable that all load currents pass through leaks electricity and the size of leakage current thereby can accurately understand, and can in time understand circuit environment of living in by reading the temperature sensor that is installed in the supervision positions such as cable side, when leakage current or detecting temperature surpass certain value, can report to the police by audible-visual annunciator, can also corresponding information be sent to by RS485 bus interface, CAN bus interface and Ethernet interface etc. the computing machine of supervision.
Description of drawings
Fig. 1 is the circuit block diagram of the electrical fire-detector of a kind of embodiment of the present utility model;
Fig. 2 is the scheme of installation of the residual current transformer of a kind of embodiment;
Fig. 3 is the scheme of installation of the residual current transformer of a kind of embodiment;
Fig. 4 is the scheme of installation of the residual current transformer of another kind of embodiment.
Embodiment
Below with reference to accompanying drawing, the specific embodiment of utility model is described in further detail.
As shown in Figure 1, the electrical fire-detector of a kind of embodiment, comprise processor, positive residual current detection interface and negative residual current detection interface, positive residual current detection interface be connected the residual current detection interface and be connected with two lead-in wires of residual current transformer respectively, just the residual current detection interface be connected the residual current detection interface and pass through the RS485 bus and be connected with processor.
As shown in Figure 2, electrical fire-detector is by the detection of residual current transformer realization to the residual current signal.The electric current that the electric current that flows out from power end as can be known according to Kirchhoff's current law (KCL) (KCL) can equal to flow back to, its phasor form is as follows:
Three-phase conducting wire and N line are all passed residual current transformer, and the electric current of detection is
, and residual current is
, that is:
Because secondary current size and primary current
Be certain proportionate relationship, just can measure by the electric current of measuring the residual current transformer secondary side residual current of primary side.
According to the difference of system power, residual current transformer has corresponding size and dimension.
Fig. 3 and Fig. 4 are respectively the scheme of installations of the residual current transformer of three-phase line and uniline.
As shown in Figure 1, in a kind of more specifically embodiment, electrical fire-detector can also comprise that positive temperature detection interface, negative temperature detect interface, signal acquisition circuit, low-pass filter circuit and A/D change-over circuit, positive temperature detection interface is connected interface and is connected with two lead-in wires of temperature sensor respectively with negative temperature, positive temperature detection interface is connected with the RS485 bus with the A/D change-over circuit by signal acquisition circuit, low-pass filter circuit successively.When having the multi way temperature sensor, by an I/O mouth of processor the multi way temperature sensor is rotated collection, greatly saved the port resource of processor.
Temperature sensor can adopt radio temperature sensor, like this, it can be installed in almost arbitrary position of monitored electric system neatly, and it can realize thoroughly separating with electrical fire-detector, even when temperature sensor burns because of on fire or other reasons, can not cause damage to electrical fire-detector yet, at this moment, electrical fire-detector also comprises wireless receiving module, wireless receiving module is connected with processor by the RS485 bus, and processor receives the temperature data that temperature sensor sends by wireless receiving module.
Electrical fire-detector can also comprise that positive A phase current detects interface, negative A phase current detects interface, positive B phase current detects interface, negative B phase current detects interface, positive C phase current detects interface and negative C phase current detects interface, positive A phase current detects interface and is connected the A phase current and detects interface and be connected with two A phase currents lead-in wires of current transformer respectively, positive B phase current detects interface and is connected the B phase current and detects interface and is connected with two B phase currents lead-in wires of current transformer respectively, and positive C phase current detects interface and is connected the C phase current and detects interface and go between with two C phase currents of current transformer respectively and be connected.Like this, can the electric current of three-phase be detected.
Electrical fire-detector can also comprise the N phase electrical interface for the A phase voltage that is electrically connected with A detects interface, the B phase voltage that is used for being electrically connected with B detects interface, the C phase voltage that is used for being electrically connected with C detects interface and is used for being electrically connected with N.Like this, can the voltage of three-phase be detected.
Residual current, phase current and voltage all adopt fast Fourier algorithm, can accurately calculate the result, and degree of accuracy is 0.2%.
Electrical fire-detector can also be for the smoke transducer interface that is connected with smoke transducer, and the smoke transducer interface is connected with processor by the RS485 bus.Like this, can the smog whether deposit the monitoring area be detected.
Electrical fire-detector can also comprise that for the audible-visual annunciator interface that is connected with audible-visual annunciator when curtage occurred unusual or exceeds the safety value of setting, audible-visual annunciator was reported to the police.
Electrical fire-detector can also comprise the first photoelectric isolating circuit, the second photoelectric isolating circuit, data buffer circuit and data-latching circuit, and the RS485 bus is connected with the second photoelectric isolating circuit by data buffer circuit, the first photoelectric isolating circuit, data-latching circuit successively.When residual current, phase current or phase voltage exceeded secure setting, electrical fire-detector sent corresponding data to subscriber equipment by the first photoelectric isolating circuit and the second photoelectric isolating circuit, has played well isolation effect.
Electrical fire-detector can also comprise RS485 bus interface, CAN bus interface, Ethernet interface and the Wi-Fi interface that is connected with external unit.A plurality of like this electrical fire-detectors can carry out networking, and can be connected with the computing machine of Surveillance center, and the computing machine of Surveillance center can be monitored the electrical fire-detector of whole network.
Claims (10)
1. electrical fire-detector, it is characterized in that: comprise processor, positive residual current detection interface and negative residual current detection interface, described positive residual current detection interface be connected the residual current detection interface and be respectively applied to be connected with two lead-in wires of residual current transformer, positive residual current detection interface be connected the residual current detection interface and be connected with processor by the RS485 bus.
2. electrical fire-detector as claimed in claim 1, it is characterized in that: comprise that also positive temperature detection interface and negative temperature detect interface, described positive temperature detection interface is connected interface and is respectively applied to be connected with two lead-in wires of temperature sensor with negative temperature, described positive temperature detection interface is connected with described processor by the RS485 bus.
3. electrical fire-detector as claimed in claim 2, it is characterized in that: also comprise wireless receiving module, described temperature sensor is radio temperature sensor, described wireless receiving module is connected with processor by the RS485 bus, and described processor receives the data of temperature sensor by wireless receiving module.
4. electrical fire-detector as claimed in claim 2, it is characterized in that: also comprise signal acquisition circuit, low-pass filter circuit and A/D change-over circuit, described positive temperature detection interface is connected with the RS485 bus with the A/D change-over circuit by signal acquisition circuit, low-pass filter circuit successively.
5. electrical fire-detector as claimed in claim 1, it is characterized in that: also comprise the first photoelectric isolating circuit, the second photoelectric isolating circuit, data buffer circuit and data-latching circuit, the RS485 bus is connected with the second photoelectric isolating circuit by data buffer circuit, the first photoelectric isolating circuit, data-latching circuit successively.
6. electrical fire-detector as claimed in claim 1 is characterized in that: also comprise the RS485 bus interface, CAN bus interface, Ethernet interface and the Wi-Fi interface that are connected with external unit.
7. electrical fire-detector as claimed in claim 1, it is characterized in that: comprise that also positive A phase current detects interface, negative A phase current detects interface, positive B phase current detects interface, negative B phase current detects interface, positive C phase current detects interface and negative C phase current detects interface, positive A phase current detects interface and is connected the A phase current and detects interface and be respectively applied to be connected with two A phase currents lead-in wires of current transformer, positive B phase current detects interface and is connected the B phase current and detects interface and be respectively applied to be connected with two B phase currents lead-in wires of current transformer, and positive C phase current detects interface and is connected the C phase current and detects interface and be respectively applied to go between with two C phase currents of current transformer and be connected.
8. electrical fire-detector as claimed in claim 1 is characterized in that: also comprise the N phase electrical interface for the A phase voltage that is electrically connected with A detects interface, the B phase voltage that is used for being electrically connected with B detects interface, the C phase voltage that is used for being electrically connected with C detects interface and is used for being electrically connected with N.
9. electrical fire-detector as claimed in claim 1 is characterized in that: comprise also that for the smoke transducer interface that is connected with smoke transducer the smoke transducer interface is connected with processor by the RS485 bus.
10. electrical fire-detector as claimed in claim 1 is characterized in that: also comprise for the audible-visual annunciator interface that is connected with audible-visual annunciator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220256312 CN202662125U (en) | 2012-06-01 | 2012-06-01 | Electrical fire detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220256312 CN202662125U (en) | 2012-06-01 | 2012-06-01 | Electrical fire detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202662125U true CN202662125U (en) | 2013-01-09 |
Family
ID=47457013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220256312 Expired - Lifetime CN202662125U (en) | 2012-06-01 | 2012-06-01 | Electrical fire detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202662125U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280337A (en) * | 2021-12-02 | 2022-04-05 | 珠海格力电器股份有限公司 | Single-channel multiplexing type fire monitoring detector and electrical fire monitoring system |
-
2012
- 2012-06-01 CN CN 201220256312 patent/CN202662125U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280337A (en) * | 2021-12-02 | 2022-04-05 | 珠海格力电器股份有限公司 | Single-channel multiplexing type fire monitoring detector and electrical fire monitoring system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 518106 South Side of Building C of Yingtang Science and Technology Industrial Park, No. 18 Baiyuan Road, Guangming Office, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Yitoa Electrical Technology Co., Ltd. Address before: 518000 Guangdong Province, Bao'an District, Shiyan Street, Shixin Community, Longma Industrial City, 5th Floor, Southern District, West and East Patentee before: Shenzhen Yitoa Electrical Technology Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130109 |