CN215932784U - Electric box fire alarm circuit and distribution box - Google Patents
Electric box fire alarm circuit and distribution box Download PDFInfo
- Publication number
- CN215932784U CN215932784U CN202122052923.XU CN202122052923U CN215932784U CN 215932784 U CN215932784 U CN 215932784U CN 202122052923 U CN202122052923 U CN 202122052923U CN 215932784 U CN215932784 U CN 215932784U
- Authority
- CN
- China
- Prior art keywords
- operational amplifier
- fire alarm
- alarm circuit
- mutual inductor
- output end
- 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
Abstract
The utility model discloses an electric box fire alarm circuit and a distribution box, which comprise a mutual inductor, a sampling resistor, an operational amplifier and an upper circuit breaker; two input ends of the mutual inductor are connected in series with an output circuit of the distribution box; the first output end of the mutual inductor is connected with the first input end of the operational amplifier; the second output end of the mutual inductor is connected with the second input end of the operational amplifier through the sampling resistor; and the signal output end of the operational amplifier is in signal connection with the power-on-off device. According to the utility model, the mutual inductor directly obtains the electric signal to be detected according to the output current on the output circuit of the distribution box, the voltage value of the electric signal to be detected is amplified through the operational amplifier, and the power on-off device is used for judging whether the power supply of the distribution box needs to be disconnected or not, so that the real-time monitoring of the data of the distribution box is realized, the problem of high fault detection delay in the prior art is solved, and the working safety of the distribution box is greatly improved.
Description
Technical Field
The utility model relates to the field of electric power security check, in particular to a fire alarm circuit of an electric box and a distribution box.
Background
With the development of the power equipment industry and the increase of power utilization equipment, more and more distribution boxes appear in our lives, and although the distribution boxes are convenient to use, the distribution boxes also have great risks. For example, short circuit of the line not only causes damage to the line, but also may cause fire and other dangers if not handled in time; the circuit is overloaded, that is, excessive electric appliances connected in the circuit can cause excessive current in the circuit, which exceeds the current carrying capacity of the circuit itself, and the circuit is damaged. Whatever reason, all can make electrical switch continuously generate heat, and it is also not good to dispel the heat itself in the block terminal in addition, leads to electrical switch overheat to burn out to lead to the emergence of accident.
Whether the abnormal conditions exist in the distribution box is monitored to the installation temperature sensor and smoke transducer of prior art usually adoption in the distribution box, but no matter lean on the temperature or lean on smog, all have more serious hysteresis quality, can not get rid of hidden danger in the very first time, need wait temperature and smog reach certain degree and just can indicate the early warning, but often the intensity of a fire is out of control this moment, and the loss has produced to increase the work load of later stage field maintenance.
Therefore, how to timely and quickly find potential safety hazards in the distribution box and send out early warning is a problem to be solved urgently by technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an electric box fire alarm circuit and a distribution box, and aims to solve the problem that potential safety hazards cannot be found in time in the prior art.
In order to solve the technical problem, the utility model provides an electric box fire alarm circuit, which comprises a mutual inductor, a sampling resistor, an operational amplifier and an upper circuit breaker;
two input ends of the mutual inductor are connected in series with an output circuit of the distribution box;
the first output end of the mutual inductor is connected with the first input end of the operational amplifier;
the second output end of the mutual inductor is connected with the second input end of the operational amplifier through the sampling resistor;
and the signal output end of the operational amplifier is in signal connection with the power-on-off device.
Optionally, in the electric box fire alarm circuit, a bidirectional transient suppression diode is further included;
the first end of the bidirectional transient suppression diode is respectively connected with the first input end of the operational amplifier and the first output end of the mutual inductor;
and the second end of the bidirectional transient suppression diode is respectively connected with the first end of the sampling resistor and the second output end of the mutual inductor.
Optionally, in the electric box fire alarm circuit, a transient filter is further included;
and the first output end of the mutual inductor is connected with the first input end of the operational amplifier through the transient filter.
Optionally, in the electric box fire alarm circuit, the transient filter is an inductor or a magnetic bead.
Optionally, in the electric box fire alarm circuit, a mutual inductance load resistor is further included;
and the first output end of the mutual inductor is connected with other elements through the mutual inductance load resistor.
Optionally, in the electric box fire alarm circuit, when the transformer is a voltage transformer, the electric box fire alarm circuit further includes an input voltage stabilizing capacitor;
the second input end of the voltage transformer is grounded through the input voltage stabilizing capacitor;
and the second output end of the voltage transformer is grounded.
Optionally, the electric box fire alarm circuit further comprises a network component;
and the signal output end of the operational amplifier is connected with an external network through the network component.
Optionally, the electric box fire alarm circuit further comprises a buzzer;
the buzzer is in signal connection with the power-on-off device.
Optionally, in the electronic box fire alarm circuit, the operational amplifier is a rail-to-rail high-precision operational amplifier.
A distribution box comprises the fire alarm circuit of the distribution box.
The utility model provides an electric box fire alarm circuit, which comprises a mutual inductor, a sampling resistor, an operational amplifier and an upper electric on-off device; two input ends of the mutual inductor are connected in series with an output circuit of the distribution box; the first output end of the mutual inductor is connected with the first input end of the operational amplifier; the second output end of the mutual inductor is connected with the second input end of the operational amplifier through the sampling resistor; and the signal output end of the operational amplifier is in signal connection with the power-on-off device.
According to the utility model, the mutual inductor directly obtains the electric signal to be detected according to the output current on the output circuit of the distribution box, the voltage value of the electric signal to be detected is amplified through the operational amplifier, and the power-on-off device judges whether the power supply of the distribution box needs to be disconnected or not, so that the real-time monitoring of the data of the distribution box is realized, if the output circuit is abnormal, the data can be immediately fed back and adjusted, the circuit damage caused by circuit overload and even fire hazard are prevented, the problem of high fault detection delay in the prior art is solved, and the working safety of the distribution box is greatly improved. The utility model also provides the distribution box with the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a fire alarm circuit of an electrical box according to the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of an electrical box fire alarm circuit according to the present invention;
FIG. 3 is a schematic structural diagram of another embodiment of an electrical box fire alarm circuit according to the present invention;
fig. 4 is a schematic structural diagram of a further embodiment of the fire alarm circuit of the electrical box according to the present invention.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the utility model is to provide a fire alarm circuit of an electric box, wherein a six-path schematic diagram of one specific embodiment is shown in fig. 1, and is called as the first specific embodiment, and comprises a mutual inductor CT, a sampling resistor R3, an operational amplifier U1 and a power-on/off device K1;
two input ends of the mutual inductor CT are connected in series with an output circuit of the distribution box;
a first output end of the transformer CT is connected with a first input end of the operational amplifier U1;
the second output end of the transformer CT is connected with the second input end of the operational amplifier U1 through the sampling resistor R3;
the signal output end of the operational amplifier U1 is in signal connection with the upper electric switch K1.
The electric box fire alarm circuit further comprises a transient filter L1;
the first output of the transformer CT is connected to the first input of the operational amplifier U1 through the transient filter L1.
The transient filter L1 is connected in series between the transformer CT and the operational amplifier U1, filters out fast transient interference in a circuit, and protects a post-stage circuit.
Further, the transient filter L1 is an inductor or a magnetic bead. The inductor converts the transient current into a magnetic field, and the magnetic beads convert the transient current into heat energy, and the selection can be carried out according to actual needs, and the utility model is not limited.
In addition, the electric box fire alarm circuit further comprises a mutual inductance load resistor R2;
the first output terminal of the transformer CT is connected to other components via the mutual inductance load resistor R2. The mutual inductance load resistor R2 can be used for adjusting the current in a post-stage circuit, the loading capacity and the overload capacity of the mutual inductor CT are considered, and a precise resistor can be selected for improving the sampling precision. The precision resistor refers to a resistor with a resistance error, a thermal stability (temperature coefficient) of the resistor and distribution parameters (distributed capacitance and distributed inductance) of the resistor reaching a certain standard resistance, and generally refers to a resistor with a resistance error within +/-0.5% of a labeled resistor.
The electric box fire alarm circuit also comprises a buzzer;
the buzzer is in signal connection with the upper electric switch K1. The buzzer can be used for monitoring the power-on switch K1, and when the power-on switch K1 judges that the current in the output circuit of the distribution box is abnormal, the buzzer buzzes to remind related workers of checking the fault problem of the distribution box.
In addition, the buzzer can also be connected with the signal output end of the operational amplifier U1, and can receive the electric signal output by the signal output end in real time, automatically judge whether the output electric signal exceeds a preset threshold value, and send out buzzing when the output electric signal exceeds the preset threshold value.
In a preferred embodiment, the electric box fire alarm circuit further comprises a mutual inductance input resistor R1;
the first input end of the transformer CT is connected to the output circuit through the mutual inductance input resistor R1.
Further, the mutual inductance input resistor R1 is a precision resistor.
In a preferred embodiment, the operational amplifier U1 is a rail-to-rail high precision operational amplifier.
The high-precision operational amplifier refers to the operational amplifier with the result precision lower than 1mV (millivolt), namely belongs to the high-precision operational amplifier, the circuit design difficulty can be greatly reduced by adopting the rail-to-rail high-precision operational amplifier, the circuit setting freedom degree is improved, and the production efficiency is improved. Still further, the rail-to-rail high-precision operational amplifier is a low-bias voltage rail-to-rail high-precision operational amplifier. In an exemplary embodiment, the voltage input of the output circuit is rated amplitude: AC220V, corresponding protection range 0.06 Un-1.5 Un, 2 times overload.
As a specific implementation, when the transformer CT is a voltage transformer CT, the transformer CT further includes an input voltage stabilizing capacitor C1;
the second input end of the voltage transformer CT is grounded through the input voltage stabilizing capacitor C1;
and the second output end of the voltage transformer CT is grounded.
When the voltage transformer CT is adopted, the second input end of the voltage transformer CT is improved, the second input end is connected with the voltage stabilizing capacitor, the accuracy of the distribution box when the output voltage fluctuation influences the measurement of a rear-stage circuit is avoided, and the accuracy of fault judgment is improved. Furthermore, the voltage-stabilizing capacitor is a high-voltage safety capacitor, an interference discharge way is provided, and the interference of fast transient and the like on a circuit is prevented.
It should be noted that the transformers shown in fig. 1, 3 and 4 are all current transformers CT, and the schematic structural diagram is shown in fig. 1, wherein primary sides and secondary sides of the current transformers CT have to correspond to one another one by one in the use process; of course, the transformer may also be a voltage transformer PT, and a schematic structural diagram of the electric box fire alarm circuit when the voltage transformer PT is adopted is shown in fig. 2. In an exemplary embodiment, the input nominal amplitude of the output circuit is: 5A, corresponding protection range of 0.06 In-10 In, and 20 times overload.
In addition, fig. 1 further includes decoupling capacitors C2 and C3 for avoiding interference, and an adjusting resistor R4 for adjusting the amplification factor of the operational amplifier U1, which are all in the prior art, and other figures are the same, and the present invention is not described again.
The upper circuit breaker K1 comprises a detection loop for receiving the output signal of the signal output terminal of the operational amplifier U1 and determining whether the electrical equipment reaches its peak value or is overloaded, and when the current is detected to exceed its threshold value (line overload) or the voltage is lower than its normal operating range (line short circuit), it will alarm and cut off the switch of the distribution box. The upper switch K1 may include a processor for determining whether the output signal is in a normal state and a relay connected to the processor for controlling the switch of the distribution box.
The utility model provides a fire alarm circuit of an electric box, which comprises a mutual inductor CT, a sampling resistor R3, an operational amplifier U1 and a power-on-off device K1; two input ends of the mutual inductor CT are connected in series with an output circuit of the distribution box; a first output end of the transformer CT is connected with a first input end of the operational amplifier U1; the second output end of the transformer CT is connected with the second input end of the operational amplifier U1 through the sampling resistor R3; the signal output end of the operational amplifier U1 is in signal connection with the upper electric switch K1. According to the utility model, the transformer CT is used for directly obtaining an electric signal to be detected according to the output current on the output circuit of the distribution box, the voltage value of the electric signal to be detected is amplified through the operational amplifier U1, and the power-on-off device K1 is used for judging whether the power supply of the distribution box needs to be cut off or not, so that the real-time monitoring of the data of the distribution box is realized, if the output circuit is abnormal, the data can be fed back and adjusted immediately, the circuit damage caused by circuit overload and even fire disaster caused by the circuit overload are prevented, the problem of high fault detection delay in the prior art is solved, and the working safety of the distribution box is greatly improved.
On the basis of the first specific embodiment, the fire alarm circuit of the electric box is further improved to obtain a second specific embodiment, and a schematic diagram of a circuit result is shown in fig. 3, and the circuit result is composed of a transformer CT, a sampling resistor R3, an operational amplifier U1 and a power-on switch K1;
two input ends of the mutual inductor CT are connected in series with an output circuit of the distribution box;
a first output end of the transformer CT is connected with a first input end of the operational amplifier U1;
the second output end of the transformer CT is connected with the second input end of the operational amplifier U1 through the sampling resistor R3;
the signal output end of the operational amplifier U1 is in signal connection with the upper electric switch K1;
also included is a bidirectional transient suppression diode D1;
a first end of the bidirectional transient suppression diode D1 is connected to a first input end of the operational amplifier U1 and a first output end of the transformer CT, respectively;
a second terminal of the bidirectional transient suppression diode D1 is connected to the first terminal of the sampling resistor R3 and the second output terminal of the transformer CT, respectively.
In this embodiment, a bidirectional transient suppression diode D1 is added to the fire alarm circuit of the electric box, and when two ends of the bidirectional transient suppression diode D1 are subjected to instantaneous high energy impact, the bidirectional transient suppression diode D1 can reduce the impedance of the fire alarm circuit at an extremely high speed (up to 1 × 10-12 seconds), absorb a large current, and clamp the voltage between the two ends of the fire alarm circuit at a predetermined value, so as to ensure that the following circuit elements are not damaged by the impact of the transient high energy, and the large current or the voltage cannot be directly burned down due to the failure of the electric box, so that the early warning effect cannot be achieved, and the working stability and the safety of the circuit are greatly improved.
On the basis of the second specific embodiment, the interconnectivity of the fire alarm circuit of the electric box is further improved to obtain a third specific embodiment, a schematic circuit structure diagram of which is shown in fig. 4 and comprises a transformer CT, a sampling resistor R3, an operational amplifier U1 and a power-on switch K1;
two input ends of the mutual inductor CT are connected in series with an output circuit of the distribution box;
a first output end of the transformer CT is connected with a first input end of the operational amplifier U1;
the second output end of the transformer CT is connected with the second input end of the operational amplifier U1 through the sampling resistor R3;
the signal output end of the operational amplifier U1 is in signal connection with the upper electric switch K1;
also included is a bidirectional transient suppression diode D1;
a first end of the bidirectional transient suppression diode D1 is connected to a first input end of the operational amplifier U1 and a first output end of the transformer CT, respectively;
a second end of the bidirectional transient suppression diode D1 is respectively connected to the first end of the sampling resistor R3 and the second output end of the transformer CT;
also included are network components WEB 1;
the signal output end of the operational amplifier U1 is connected to an external network through the network component WEB 1.
In this embodiment, for the electronic box fire alarm circuit has been add network component WEB1 adds behind network component WEB1, can with the signal of signal output part output uploads in real time to high in the clouds backstage, monitors or collects the arrangement, makes things convenient for the in service behavior of staff real-time supervision block terminal internal current and voltage, can in time respond, has not only reduced the probability that the electronic box takes place unusually, has still avoided the emergence of incident, but also has reduced the cost of maintenance after sale.
The utility model also provides a distribution box which comprises the fire alarm circuit of the distribution box. The utility model provides a fire alarm circuit of an electric box, which comprises a mutual inductor CT, a sampling resistor R3, an operational amplifier U1 and a power-on-off device K1; two input ends of the mutual inductor CT are connected in series with an output circuit of the distribution box; a first output end of the transformer CT is connected with a first input end of the operational amplifier U1; the second output end of the transformer CT is connected with the second input end of the operational amplifier U1 through the sampling resistor R3; the signal output end of the operational amplifier U1 is in signal connection with the upper electric switch K1. According to the utility model, the transformer CT is used for directly obtaining an electric signal to be detected according to the output current on the output circuit of the distribution box, the voltage value of the electric signal to be detected is amplified through the operational amplifier U1, and the power-on-off device K1 is used for judging whether the power supply of the distribution box needs to be cut off or not, so that the real-time monitoring of the data of the distribution box is realized, if the output circuit is abnormal, the data can be fed back and adjusted immediately, the circuit damage caused by circuit overload and even fire disaster caused by the circuit overload are prevented, the problem of high fault detection delay in the prior art is solved, and the working safety of the distribution box is greatly improved.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is to be noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The fire alarm circuit of the electric box and the distribution box provided by the utility model are introduced in detail. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The electric box fire alarm circuit is characterized by comprising a mutual inductor, a sampling resistor, an operational amplifier and an upper electric on-off device;
two input ends of the mutual inductor are connected in series with an output circuit of the distribution box;
the first output end of the mutual inductor is connected with the first input end of the operational amplifier;
the second output end of the mutual inductor is connected with the second input end of the operational amplifier through the sampling resistor;
and the signal output end of the operational amplifier is in signal connection with the power-on-off device.
2. The electrical box fire alarm circuit of claim 1, further comprising a bidirectional transient suppression diode;
the first end of the bidirectional transient suppression diode is respectively connected with the first input end of the operational amplifier and the first output end of the mutual inductor;
and the second end of the bidirectional transient suppression diode is respectively connected with the first end of the sampling resistor and the second output end of the mutual inductor.
3. The electrical box fire alarm circuit of claim 1, further comprising a transient filter;
and the first output end of the mutual inductor is connected with the first input end of the operational amplifier through the transient filter.
4. The electrical box fire alarm circuit of claim 3, wherein the transient filter is an inductor or a magnetic bead.
5. The electrical box fire alarm circuit of claim 1, further comprising a mutual inductance load resistor;
and the first output end of the mutual inductor is connected with other elements through the mutual inductance load resistor.
6. The electrical box fire alarm circuit of claim 1, further comprising a network component;
and the signal output end of the operational amplifier is connected with an external network through the network component.
7. The electrical box fire alarm circuit of claim 1, further comprising a buzzer;
the buzzer is in signal connection with the power-on-off device.
8. The electrical box fire alarm circuit of claim 1, wherein the operational amplifier is a rail-to-rail high precision operational amplifier.
9. An electrical box fire alarm circuit according to any of claims 1 to 8 further comprising an input voltage stabilization capacitor when the transformer is a voltage transformer;
the second input end of the voltage transformer is grounded through the input voltage stabilizing capacitor;
and the second output end of the voltage transformer is grounded.
10. An electrical box characterized in that it comprises an electrical box fire alarm circuit according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122052923.XU CN215932784U (en) | 2021-08-27 | 2021-08-27 | Electric box fire alarm circuit and distribution box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122052923.XU CN215932784U (en) | 2021-08-27 | 2021-08-27 | Electric box fire alarm circuit and distribution box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215932784U true CN215932784U (en) | 2022-03-01 |
Family
ID=80421640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122052923.XU Active CN215932784U (en) | 2021-08-27 | 2021-08-27 | Electric box fire alarm circuit and distribution box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215932784U (en) |
-
2021
- 2021-08-27 CN CN202122052923.XU patent/CN215932784U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207817127U (en) | A kind of dry-type air-core reactor fault detection system | |
| CN206313534U (en) | Bar rack type becomes radio station monitoring device | |
| KR101869273B1 (en) | The means of detecting arc and leakage current in a solar cell module, and the interception apparatus thereof | |
| CN204179751U (en) | For the protective relaying device that control loop digitlization monitors | |
| CN106990304A (en) | Power capacitor running status on-line monitoring method based on capacitance | |
| CN111555449A (en) | Wisdom safety power consumption monitoring system | |
| CN114460888A (en) | Wisdom energy management system | |
| CN107884645A (en) | Based on voltage ratio compared with power capacitor method for monitoring operation states | |
| CN105140889A (en) | Inverter over-current protection circuit | |
| CN111579934A (en) | Method and device for realizing electric safety monitoring of external power network of base station and base station | |
| CN215932784U (en) | Electric box fire alarm circuit and distribution box | |
| CN103248027A (en) | Monitor for intelligent electricity using | |
| CN105717426A (en) | Insulation monitoring device and method capable of preventing buses from misoperation | |
| CN214225399U (en) | Distribution transformer winding operating temperature on-line monitoring device | |
| CN209342855U (en) | A kind of cable insulation status diagnostic device | |
| CN204992785U (en) | Take low voltage network monitored control system of trouble early warning and diagnostic function | |
| CN202710647U (en) | Monitoring device for direct current system | |
| CN204575769U (en) | Secondary current loop of transforming plant state on_line monitoring system | |
| CN212659960U (en) | Circuit breaker with current detection function | |
| CN208654255U (en) | A kind of multi-functional Reactor Fault on-Line Monitor Device | |
| KR100317235B1 (en) | Trip Circuit Detector | |
| CN112600177A (en) | Active comprehensive protection device of direct current ring network system and working method thereof | |
| CN220732351U (en) | Automatic protector for secondary side short circuit of voltage transformer | |
| CN220475397U (en) | Overcurrent protection circuit for intelligent jar wheel | |
| CN113161993B (en) | Low-frequency oscillation suppression method and device for electromagnetic voltage transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |