CN109270391B - Fire-fighting cable detection device - Google Patents
Fire-fighting cable detection device Download PDFInfo
- Publication number
- CN109270391B CN109270391B CN201811135183.2A CN201811135183A CN109270391B CN 109270391 B CN109270391 B CN 109270391B CN 201811135183 A CN201811135183 A CN 201811135183A CN 109270391 B CN109270391 B CN 109270391B
- Authority
- CN
- China
- Prior art keywords
- circuit
- triode
- collector
- connection
- comparator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
Abstract
A fire-fighting cable detection device is used for detecting the voltage drop of a fire-fighting cable and comprises an input circuit, a rectification circuit, a comparison circuit, an amplification circuit and an output display circuit; the input circuit, the rectifying circuit, the comparing circuit, the amplifying circuit and the output display circuit are connected in this way. The device is simple and can be carried about, whether the LED lamp is qualified or not is visually displayed by setting the door threshold value to trigger the on and off of the LED lamp, and the judgment of detection personnel is facilitated; the invention can also be provided with a built-in dial, can visually display the voltage drop value of a detected product, and can judge whether the wire breakage problem exists or not by adjusting the potentiometer and observing the dial, thereby determining whether the product is eliminated or not.
Description
Technical Field
The invention relates to the field of detection devices, in particular to a fire-fighting cable detection device.
Background
The fire safety is the civilian field which is concerned about the vital safety of the citizens in China, along with the promotion of the urbanization in China, a large number of high-rise residences are pulled out of the ground to relieve the shortage of land, however, the higher the building height is, the higher the safety level requirement is, and the higher the fire safety equipment requirement matched with the building height is.
According to the requirements of the recently-developed fire safety law and building design specifications in China, the voltage drop of a cable required to be connected in some important equipment in a building with high fire safety requirements cannot exceed 20 percent, so that the relevant important equipment can work under a stable rated voltage. Especially to starting solenoid valve class aggregate unit such as steel bottle among smoke damper, wind gap, the gaseous fire extinguishing system, as real "power consumption owner", lead to aggregate unit action current excessively to form the circuit voltage drop among the power bus, and then lead to equipment low pressure abnormal start even not start, lose the setting original intention of fire control safety. Therefore, in the prior art of fire-fighting cables, no special detection device which is simple, convenient and easy to carry exists.
Therefore, the conventional cable manufacturer needs to provide a cable inspection device which can conveniently inspect the finished cable to ensure that the finished cable meets the requirements before leaving the factory.
Disclosure of Invention
In view of the problems set forth in the background, a fire electricity cable detection apparatus is provided to solve the problems, and the present invention is further described below.
A fire-fighting cable detection device is used for detecting the voltage drop of a fire-fighting cable and comprises an input circuit, a rectification circuit, a comparison circuit, an amplification circuit and an output display circuit; wherein the content of the first and second substances,
an input circuit connected to the cable to be tested via a port A and a port B, the port A being connected to a transistor T1And through a potentiometer R1Connected to a power supply, and connected with a triode T at a port B2Of (2) aPole and pass resistor R0Grounding by using a triode T1And T2The formed differential amplifying circuit with double-end input and single-end output, and the triode T4The collector of (2) is used as an output end;
a rectifier circuit including four diodes D connected in a ring shape1、D2、D3、D4Diode D1And D4Anode of (2) is connected to the output terminal of the input circuit, diode D1Anode connection D of2Anode of (D)4Cathode of (D)3A cathode of (D)2And D3Is connected to the back ground, diode D1And D2Leading out and D after anode connection4And D3The lead-out of the cathode connection of the rectifier circuit is connected and then used as the output end of the rectifier circuit;
the comparison circuit comprises a comparator V, wherein the positive phase input end of the comparator V is connected with the output end of the rectification circuit, and the negative phase input end of the comparator V passes through a resistor R5Connected to a power supply, the positive input end of the comparator V passes through a resistor R4Connected to ground, the output of the comparator V passing through a feedback resistor R6The threshold value of the comparator V is determined according to actual needs, and the output of the comparator V is used as the output end of the comparison circuit;
the amplifying circuit comprises at least one stage of amplifying circuit including a triode T8And T9Composed of composite amplifying circuit, triode T8Base electrode through resistor R7Connected to the output of the comparison circuit, T8Emitter and T9Base connection of (1), T8Collector electrode and T9Is connected to a power supply, T9Emitter through resistor R9Ground, T8And T9The connected collector is used as the output end of the amplifying circuit;
the display circuit comprises an LED lamp and an ammeter, the LED lamp is arranged on the amplifying circuit T8、T9On the collector output terminal of the current meter and a resistor R10After being connected in series, the two ends of the amplifying circuit are connected in parallel.
Furthermore, the input circuit also comprises a current source current which comprises a triode T3、T4、T5、T6And T7(ii) a The input circuit also comprises an active circuit as a load of the differential amplification circuit, and the active circuit comprises a triode T10And T11。
Furthermore, in the differential amplification circuit, a triode T1And T2Collector electrode connection of, T1Base connection port A, T of2Base connection port B, T1The emitter of the transistor is connected with a triode T3Emitter of, T2Emitter connection T of4Emitter of, T3And T4The base electrode of (1) is connected; t is3Collector electrode and T6Collector electrode connection of, T4Collector electrode and T7Collector electrode connection of, T6And T7Base interconnection of (2), T6Through a resistance R1Ground, T7Through a resistance R3Grounding; t is3And T6The collector connected with T5Is connected to the base electrode of T5Emitter and T6And T7The connected base electrode is connected with the resistor R2Grounded, T5The collector of the grid is connected with voltage; triode T1And T2Connected collector and T10Collector electrode connection of, T10And T11Is connected with the base electrode and then is connected with T10Collector electrode connection of, T10And T11Is connected to a power supply, T11Is connected to T3And T4To the associated base.
Further, the threshold value of the comparator V in the comparison circuit is 0.8 times of the detection voltage value U actually loaded, i.e. 0.8U.
Furthermore, in the at least one stage of amplifying circuit, the amplifying circuit adopts a CMOS device instead of a triode device.
Furthermore, two ends of the amplifying circuit are directly connected in parallel to a voltmeter.
Has the advantages that: the device is simple and can be carried about, whether the LED lamp is qualified or not is visually displayed by setting the door threshold value to trigger the on and off of the LED lamp, and the judgment of detection personnel is facilitated; the invention can also be provided with a built-in dial, can visually display the voltage drop value of a detected product, and can judge whether the wire breakage problem exists or not by adjusting the potentiometer and observing the dial, thereby determining whether the product is eliminated or not.
Drawings
FIG. 1: the invention has a schematic structure;
FIG. 2: the invention discloses a circuit schematic diagram.
Detailed Description
A specific embodiment of the present invention will now be described in detail with reference to the accompanying drawings.
A fire-fighting cable detection device is characterized in that two ends A 'and B' of a cable to be detected are accessed through a port A and a port B which are arranged outside the fire-fighting cable detection device, whether the accessed cable is qualified or not is judged through the on-off condition of an LED lamp (indicator lamp), when the LED is on, the cable is qualified, and when the LED is not on, the cable is unqualified; and observing the dial plate to display a numerical value when the cable is unqualified, if the cable is within the deviation range, indicating that the cable is qualified, and otherwise, indicating that the cable is unqualified.
Referring to the working principle of the invention shown in fig. 2, the circuit of the invention comprises an input circuit, a rectifying circuit, a comparing circuit, an amplifying circuit and an output display circuit.
The input circuit is connected with a cable to be tested through a port A and a port B, the port A is connected to a power supply through a potentiometer R', and the port B is connected with a resistor R0Grounding, wherein the resistance value of the circuit to be tested is small, so that the voltage loaded on the cable to be tested does not exceed the withstand voltage range of the triode at the input end, and the adjustment is carried out through a potentiometer R'; the input circuit adopts a differential amplification circuit with double-end input and single-end output, the input resistance is large, the differential mode amplification factor is large, the common mode amplification factor is small, the input end is high in withstand voltage, and level conversion can be completed. Triode T1And T2Collector electrode connection of, T1Base connection port A, T of2Base connection port B, T1The emitter of the transistor is connected with a triode T3Emitter of, T2Emitter connection T of4Emitter of, T3And T4The base electrode of (1) is connected; t is3Collector electrode ofAnd T6Collector electrode connection of, T4Collector electrode and T7Collector electrode connection of, T6And T7Base interconnection of (2), T6Through a resistance R1Ground, T7Through a resistance R3Grounding; t is3And T6The collector connected with T5Is connected to the base electrode of T5Emitter and T6And T7The connected base electrode is connected with the resistor R2Grounded, T5The collector of the grid is connected with voltage; triode T1And T2Connected collector and T10Collector electrode connection of, T10And T11Is connected with the base electrode and then is connected with T10Collector electrode connection of, T10And T11Is connected to a power supply, T11Is connected to T3And T4To the connected base; in the input circuit, T5And T6Respectively as T3And T4Active load of, T4And also as T6Active load of, T4And T7One end of the connected collector is led out to be used as the input end of the rectifying circuit. The input circuit of the invention has large resistance, large differential mode amplification factor and small common mode amplification factor, the input voltage end has high withstand voltage and can complete level conversion, namely output to ground.
A rectifier circuit including four diodes D connected in a ring shape1、D2、D3、D4Diode D1And D4Anode of (2) is connected to the output terminal of the input circuit, diode D1Anode connection D of2Anode of (D)4Cathode of (D)3A cathode of (D)2And D3Is connected to the back ground, diode D1And D2Leading out and D after anode connection4And D3The cathode of the rectifier is connected with the output end of the rectifier circuit after being led out and connected with the comparator circuit.
The comparison circuit comprises a comparator V, the positive phase input end of the comparator V is connected with the output of the rectification circuit, and the negative phase input end of the comparator V passes through a resistor R5Is connected to a power supplyThe positive phase input end of the comparator V passes through a resistor R4Connected to ground, the output of the comparator V passing through a feedback resistor R6Is connected to the non-inverting input terminal, and the output of the comparator V is connected to the display circuit. The threshold value of the comparator V is determined as U according to the voltage value loaded actually, the voltage drop on the cable to be measured can not exceed 20% according to the standard, namely the measured voltage value is 0.8U at least, and in order to guarantee the qualified rate, a certain deviation range can be improved, but negative deviation is not allowed. In this embodiment, the qualified standard is set to 0.8U, and the threshold value is set according to the qualified standard of 0.8U. When the input end of the comparison circuit is larger than the set threshold value, the comparator triggers the action to send out an output signal to be input to the amplifying circuit.
The amplifying circuit comprises at least one stage of amplifying circuit, the embodiment adopts the one stage of amplifying circuit and comprises a triode T8And T9Composed of composite amplifying circuit, triode T8Base electrode through resistor R7Connected to the output of the comparison circuit, T8Emitter and T9Base connection of (1), T8Collector electrode and T9Is connected to a power supply, T9Emitter through resistor R9Ground, T8And T9The collector is connected as the output of the amplifying circuit. The amplifier circuit amplifies and outputs the output of the comparator circuit through at least one stage of amplifier circuit, so that the display current operates.
The display circuit comprises an LED lamp and an ammeter, wherein the LED lamp is arranged at T8、T9On the collector electrode, ammeter and resistor R10After being connected in series, the two ends of the amplifying circuit are connected in parallel, or the two ends of the amplifying circuit are directly connected in parallel to a voltmeter. After the amplifying circuit is conducted, the LED lamp on the collector is conducted to emit light, and the cable to be detected is a qualified product; the ammeter displays the value, and the invention passes the value of the ammeter through the resistor R10The function of (1) is converted into displaying voltage value, and the dial value of the dial plate displays whether the dial plate is qualified or not, and the dial plate is qualified within the range of more than 0.8U.
It is worth noting that when the cable to be tested is detected and the indicator light is not on, the cable to be tested is probably caused by the open circuit of the cable to be tested, and the resistance value is too large to cause the comparison circuit not to operate, at the moment, the dial display value is also zero, although at the moment, the cable to be tested is an unqualified product no matter what reason, but because the subsequent processing procedures are different, the cable to be tested needs to be further distinguished: when the indicating lamp and the dial plate do not display, the resistance value of the potentiometer is gradually reduced, and if the indicating lamp and the dial plate do not display all the time, the cable to be tested is broken.
The working principle is as follows: connecting two ends of a cable to be detected to terminals, connecting A to terminal A ', connecting B to terminal B', connecting a closed switch to a detection circuit, conducting a flowing current of the cable to be detected as an input of a differential amplification circuit with double-end input and single-end output, and using a triode T as the differential amplification circuit3、T4、T5、T6And T7The current of the current source is a load, and the common-mode signal is output to the sorting circuit after being suppressed; the rectifying circuit rectifies the input signal to convert the two-phase signal into a single-phase signal, and the diode D passes the signal when the normal-phase signal flows into the rectifying circuit4And a diode D3The signal flows to the comparison circuit, and when the positive phase signal flows into the rectification circuit, the positive phase signal passes through the diode D1And a diode D2The signal flows to the comparison circuit, so that the comparison circuit always receives a positive phase signal; the positive input end of the comparison circuit receives a signal and compares the signal with a set gate valve value, if the signal is greater than the set gate valve value, the comparator outputs a high level, the amplification circuit connected with the comparator is conducted, and if the signal is less than the set gate valve value, the comparator outputs a low level, and the amplification circuit connected with the comparator is cut off; the conducted comparison circuit outputs high level and triggers the amplifying circuit, and the high level passes through a triode T8、T9The composite triode amplifying circuit is used for amplifying and driving the indicator light to light; the LED lamp arranged on the collector of the amplifying circuit is conducted to emit light for display, and an ammeter arranged in parallel with the amplifying circuit displays the light and serves as a voltage signal to be displayed on the dial plate; if the switch dial of the switch is switched on and the indicating lamp is not on, the resistance value of the potentiometer is adjusted, if the indicating lamp is not on all the time and the dial has no value all the time, the disconnection of a certain part in the cable which is being detected is indicated, and if the indication is carried out after the adjustment, the disconnection of the certain part in the cable is indicatedThe lamp is always on and the dial plate always has numerical value display, which indicates that the inside of the cable is detected to have no open circuit condition but the circuit is an unqualified cable with voltage drop exceeding the standard.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A fire-fighting cable detection device is used for detecting the voltage drop of a fire-fighting cable and is characterized by comprising an input circuit, a rectification circuit, a comparison circuit, an amplification circuit and an output display circuit; wherein the content of the first and second substances,
an input circuit connected to the cable to be tested via a port A and a port B, the port A being connected to a transistor T1The base of the transistor is connected to a power supply through a potentiometer R', and a port B is connected with a triode T2And through a resistor R0Grounding by using a triode T1And T2The formed differential amplifying circuit with double-end input and single-end output, and the triode T4The collector of (2) is used as an output end; the input circuit also comprises a current source current which comprises a triode T3、T4、T5、T6And T7The input circuit also comprises an active circuit as a load of the differential amplifying circuit, and the active circuit comprises a triode T10And T11；
A rectifier circuit including four diodes D connected in a ring shape1、D2、D3、D4Diode D1And D4Anode of (2) is connected to the output terminal of the input circuit, diode D1Anode connection D of2Anode of (D)4Cathode of (D)3A cathode of (D)2And D3Is connected to the back ground, diode D1And D2Leading out and D after anode connection4And D3After the lead-out connection of the cathode connection is used as rectification powerAn output terminal of the circuit;
the comparison circuit comprises a comparator V, wherein the positive phase input end of the comparator V is connected with the output end of the rectification circuit, and the negative phase input end of the comparator V passes through a resistor R5Connected to a power supply, the positive input end of the comparator V passes through a resistor R4Connected to ground, the output of the comparator V passing through a feedback resistor R6The threshold value of the comparator V is determined according to actual needs, the output of the comparator V is used as the output end of the comparison circuit, and the threshold value of the comparator V in the comparison circuit is 0.8 times of the actually loaded detection voltage value U;
the amplifying circuit comprises at least one stage of amplifying circuit including a triode T8And T9Composed of composite amplifying circuit, triode T8Base electrode through resistor R7Connected to the output of the comparison circuit, T8Emitter and T9Base connection of (1), T8Collector electrode and T9Is connected to a power supply, T9Emitter through resistor R9Ground, T8And T9The connected collector is used as the output end of the amplifying circuit;
the display circuit comprises an LED lamp and an ammeter, wherein the LED lamp is arranged in the triode T of the amplifying circuit8、T9On the collector output terminal of the current meter and a resistor R10After being connected in series, the two ends of the amplifying circuit are connected in parallel.
2. A fire electricity cable detecting apparatus according to claim 1, wherein: in the differential amplifying circuit, a triode T1And T2Collector electrode connection of, T1Base connection port A, T of2Base connection port B, T1The emitter of the transistor is connected with a triode T3Emitter of, T2Emitter connection T of4Emitter of, T3And T4The base electrode of (1) is connected; t is3Collector electrode and T6Collector electrode connection of, T4Collector electrode and T7Collector electrode connection of, T6And T7Base interconnection of (2), T6Through a resistance R1Ground, T7Through a resistance R3Grounding; t is3And T6The collector connected with T5Is connected to the base electrode of T5Emitter and T6And T7The connected base electrode is connected with the resistor R2Grounded, T5The collector of the grid is connected with voltage; triode T1And T2Connected collector and T10Collector electrode connection of, T10And T11Is connected with the base electrode and then is connected with T10Collector electrode connection of, T10And T11Is connected to a power supply, T11Is connected to T3And T4To the associated base.
3. A fire electricity cable detecting apparatus according to claim 1, wherein: in the at least one stage of amplifying circuit, the amplifying circuit adopts CMOS devices to replace triode devices.
4. A fire electricity cable detecting apparatus according to claim 1, wherein: two ends of the amplifying circuit are directly connected in parallel to a voltmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811135183.2A CN109270391B (en) | 2018-09-28 | 2018-09-28 | Fire-fighting cable detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811135183.2A CN109270391B (en) | 2018-09-28 | 2018-09-28 | Fire-fighting cable detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109270391A CN109270391A (en) | 2019-01-25 |
| CN109270391B true CN109270391B (en) | 2020-11-27 |
Family
ID=65198539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811135183.2A Active CN109270391B (en) | 2018-09-28 | 2018-09-28 | Fire-fighting cable detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109270391B (en) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87216917U (en) * | 1987-12-25 | 1988-11-02 | 马国强 | Induction-type in situ qualitative break wire detector |
| CN2195099Y (en) * | 1994-05-11 | 1995-04-19 | 鞍山钢铁公司 | Cable core break tester |
| CN201681132U (en) * | 2010-05-04 | 2010-12-22 | 四川新东方电缆集团有限公司 | Rubber sleeve cable break circuit fast detector |
| CN102269791B (en) * | 2011-04-27 | 2013-09-04 | 兰州交通大学 | Online monitoring and positioning method of railway signal cable disconnection fault |
| CN102253312A (en) * | 2011-06-01 | 2011-11-23 | 刘喆 | Cable breakage detector |
| CN204228875U (en) * | 2014-10-30 | 2015-03-25 | 黄月华 | Path break circuit fast detector |
| CN104730410B (en) * | 2015-03-16 | 2017-11-21 | 王金泽 | A kind of distribution line disconnection monitoring method and device based on voltage x current vector |
| CN104991164B (en) * | 2015-06-23 | 2017-12-26 | 中国电子科技集团公司第七研究所 | A kind of cable on-line checking device |
| CN205027852U (en) * | 2015-08-14 | 2016-02-10 | 周云侠 | Electric wire breakpoint detector |
-
2018
- 2018-09-28 CN CN201811135183.2A patent/CN109270391B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109270391A (en) | 2019-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104677417B (en) | A kind of fault detection system and its detection method for transmission line of electricity | |
| CN205263227U (en) | Leakage detection equipment | |
| CN104297611A (en) | Transformer sampling circuit | |
| CN207457454U (en) | Ion blower failure detection circuit and detector | |
| CN109270391B (en) | Fire-fighting cable detection device | |
| CN105572517A (en) | Online monitoring type intelligent electrified switching-in protection device of lightning arrester and control method | |
| CN206470362U (en) | A kind of warning circuit | |
| CN103323732B (en) | Photovoltaic inverter multi-channel input reverse connection detection circuit with self-diagnostic function | |
| CN207964947U (en) | Adjustable earth resistance tester | |
| CN207557390U (en) | MBUS bus short circuit detection circuits | |
| CN204421946U (en) | A kind of fault detection system for transmission line of electricity | |
| CN104237573B (en) | Charger for mobile phone ATE | |
| CN206177926U (en) | Indoor air quality tester | |
| CN205610749U (en) | Telephone circuit trouble integrated test device | |
| CN209198627U (en) | A kind of battery voltage detector | |
| CN107884666A (en) | MBUS bus short circuits detect circuit and its detection method | |
| CN103472345B (en) | A kind of electrical equipment grounding line burn-in test circuit | |
| CN106711952B (en) | The source of stable pressure that compound amplifying type multiple spot monitoring coexists with protection | |
| CN203490312U (en) | Aging detection circuit of grounding wire of electric equipment | |
| CN209071636U (en) | A kind of anti-error hanging earthing conductor device | |
| CN211786034U (en) | Transformer substation overhauls operation earth connection state monitoring devices | |
| CN203606930U (en) | Inspection well gas safety alarm | |
| CN207366704U (en) | With relay rapid detection apparatus directly perceived in hand-held tunnel | |
| CN208255308U (en) | A kind of double-range power consumption test circuit of pacemaker | |
| CN206340126U (en) | Network fire-control alarm host machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |