CN219831342U

CN219831342U - Lamp pole drain voltage detecting system

Info

Publication number: CN219831342U
Application number: CN202320895685.5U
Authority: CN
Inventors: 王亮军; 夏大叶; 李宏文; 陈伟; 肖昌民; 谭平平
Original assignee: Zhonghui Microelectronics Co ltd
Current assignee: Zhonghui Microelectronics Co ltd
Priority date: 2023-04-19
Filing date: 2023-04-19
Publication date: 2023-10-13
Anticipated expiration: 2033-04-19

Abstract

A lamp pole leakage voltage detection system for a street lamp lighting system, comprising: the power distribution protection system comprises a live wire, a working zero wire and a ground wire, or comprises a live wire, a working zero wire, a protection zero wire and a ground wire; the street lamp controller comprises a microcontroller unit and a drain voltage detection unit electrically connected with the microcontroller unit, wherein the drain voltage detection unit is used for detecting the voltage of a ground wire in the power distribution protection system, which is used as the drain voltage of a lamp post, and sending the voltage to the microcontroller unit, and the microcontroller unit is used for judging whether the lamp post is leaked or not according to the detected drain voltage value. The utility model can accurately judge whether the lamp post has electric leakage or not.

Description

Lamp pole drain voltage detecting system

Technical Field

The utility model belongs to the technical field of street lamp lighting systems, and particularly relates to a street lamp pole leakage voltage detection system.

Background

Street lamps are one of the important municipal infrastructures of cities and are distributed in urban street and alley. In the operation process of the street lamp, electric leakage can be caused by severe power consumption environment, ageing of lines, poor insulation of cable joints, heating of rectifiers, damage of external force, product quality and other reasons, so that a metal lamp post of the street lamp is electrified, and the safety of pedestrians is directly endangered. The greater the voltage or current intensity, the longer the duration, and the greater the fatal risk. In order to ensure the safety and normal operation of the street lamp facilities and ensure the life and property safety of people, anti-creeping measures are required to be taken for the street lamp facilities.

In order to avoid safety accidents caused by electricity leakage of the street lamp, electricity leakage detection needs to be carried out on the street lamp line. At present, the leakage detection method of the street lamp system mainly comprises a leakage current detection method and a line voltage analysis method. The leakage current detection method is to detect residual current through a current transformer, the detection value is sent to a street lamp controller, and the circuit leakage is judged when the leakage current is larger than the warning value. The leakage current detection method can only measure current, but cannot measure the induced voltage of the lamp post. The line voltage analysis method is to utilize the principle that the line leakage can cause voltage value change to judge leakage, the street lamp controller measures the street lamp voltage, generates the street lamp voltage history record of each street lamp node and calculates the street lamp voltage average value, then compares the voltage of the street lamp node acquired in real time with the street lamp voltage average value, and judges leakage when the comparison result exceeds the early warning value.

Disclosure of Invention

The utility model aims to provide a lamp pole leakage voltage detection system, which can evaluate the leakage risk through the leakage voltage value so as to reduce the occurrence of street lamp safety accidents.

In order to achieve the above object, the present utility model adopts the following technical solutions:

a lamp pole leakage voltage detection system for a street lamp lighting system, comprising: the power distribution protection system comprises a live wire, a working zero wire and a ground wire, or comprises a live wire, a working zero wire, a protection zero wire and a ground wire; the street lamp controller comprises a microcontroller unit and a drain voltage detection unit electrically connected with the microcontroller unit, wherein the drain voltage detection unit is used for detecting that the lamp pole is opposite to the voltage of the ground wire in the power distribution protection system as the drain voltage of the lamp pole and sending the drain voltage to the microcontroller unit, and the microcontroller unit is used for judging whether the lamp pole is leaked or not according to the detected drain voltage value.

According to the lamp pole leakage voltage detection system, optionally, the power distribution protection system is a TT system, and the TT system comprises a live wire, a working zero wire and a ground wire and supplies power for a three-phase five-wire system.

According to the lamp pole leakage voltage detection system, optionally, the power distribution protection system is a TN-S system, and the TN-S system comprises a live wire, a working zero wire, a protection zero wire and a ground wire and supplies power for a three-phase six-wire system.

The lamp pole leakage voltage detection system comprises a lamp pole circuit voltage sampling unit, a lamp pole circuit current sampling unit, a leakage current detection unit, a PWM dimming unit, a metering circuit, an indicator lamp unit, a communication unit, a storage unit and a power supply unit for supplying power to the above units.

According to the lamp pole drain voltage detection system, optionally, the drain voltage detection unit is a voltage transformer.

In the lamp pole leakage voltage detection system, optionally, the communication unit is an NB-IOT communication module.

According to the lamp pole leakage voltage detection system, the street lamp line voltage sampling unit is a resistor voltage division sampling circuit.

According to the lamp pole leakage voltage detection system, the current sampling unit of the street lamp line is a manganese-copper sampling resistor.

In the lamp pole leakage voltage detection system, optionally, the leakage current detection unit is a current transformer.

According to the technical scheme, the ground wire is added in the power distribution protection system of the street lamp, and whether the street lamp leaks electricity or not can be accurately judged by detecting the voltage between the lamp post and the ground wire in the power distribution protection system as leakage voltage, so that the situation that the street lamp is inaccurately measured due to the fact that the voltage of the street lamp is taken by the leakage electricity is avoided. The method fills the blank of the earth voltage detection technology of the earth leakage of the street lamp, can more intuitively and accurately judge whether the lamp post has the earth leakage or not, can provide intuitive earth voltage data for street lamp management departments, and reduces the occurrence of street lamp safety accidents by analyzing the earth voltage value (the earth leakage voltage value) to assist in positioning the position of the lamp post where the earth leakage occurs and judging the risk level and adopting responsive protection measures according to the risk level. And only one ground wire is needed to be added in the power distribution protection system, so that the construction is convenient and the cost is low.

Drawings

In order to more clearly illustrate the embodiments of the present utility model, the following description will briefly explain the embodiments or the drawings required for the description of the prior art, it being obvious that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.

FIG. 1 is a wiring diagram of a TT system;

FIG. 2 is a wiring diagram of a TN-S system;

FIG. 3 is a wiring diagram of a TT system according to an embodiment of the present utility model;

FIG. 4 is a wiring diagram of a TN-S system according to an embodiment of the present utility model;

fig. 5 is a block diagram of a street lamp controller according to an embodiment of the present utility model.

The following describes the embodiments of the present utility model in further detail with reference to the drawings.

Detailed Description

In describing embodiments of the present utility model in detail, the drawings showing the structure of the device are not to scale locally for ease of illustration, and the schematic illustrations are merely examples, which should not limit the scope of the utility model. It should be noted that the drawings are in simplified form and are not to scale precisely, but rather are merely intended to facilitate and clearly illustrate the embodiments of the present utility model. Meanwhile, in the description of the present utility model, the terms "first", "second", etc. are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated; the terms "forward," "reverse," "bottom," "upper," "lower," and the like are used for convenience in describing and simplifying the description only, and do not denote or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The street lamp controller is a device for controlling on/off of a street lamp and adjusting brightness of the street lamp in a street lamp lighting system. The street lamp controller not only can control the switch and the brightness of the street lamp, but also can collect the information such as the current, the voltage and the power of the street lamp, thereby realizing the centralized control of the street lamp, the informatization of the operation and maintenance and the intellectualization of the illumination. The existing street lamp lighting system comprises a street lamp and a street lamp controller, and also comprises a power distribution protection system. The distribution protection system which is commonly used in the street lamp lighting system at present comprises a three-phase four-wire system or a three-phase five-wire system, such as a TN-S system or a TT system.

Fig. 1 is a wiring diagram of a TT system, as shown in fig. 1, the TT system supplies power to a three-phase four-wire system, the system includes a live wire (L1, L2, L3) and a working neutral wire (N), the TT system grounds a neutral point of a power transformer, and a metal casing of an electrical device is directly grounded. Fig. 2 is a wiring diagram of a TN-S system, as shown in fig. 2, the TN-S system supplies power to a three-phase five-wire system, and one more protective neutral wire (PE) than the TT system, which includes a live wire (L1, L2, L3), a working neutral wire (N), and a protective neutral wire (PE), and the working neutral wire and the protective neutral wire of the TN-S system are separated from each other from a power source end neutral point.

When the lamp post leaks electricity, the N line or the PE line of a power distribution protection system such as a TN-S system or a TT system cannot be determined to be 0V voltage, so that the N line or the PE line cannot be used as a reference 0V, and therefore the leakage voltage of the street lamp is difficult to measure by using the street lamp controller. The drain voltage of the present utility model refers to a ground voltage when an electrical device is grounded, that is, a potential difference between a housing, a ground wire, a ground body, etc. of the grounding device and a zero potential point when the electrical device is grounded.

In order to realize detection of the lamp pole leakage voltage and reduce the occurrence of safety accidents, the utility model provides a lamp pole leakage voltage detection method which can realize collection of the lamp pole to the ground voltage (leakage voltage) and accurately judge whether the lamp pole leaks or not. The detection method comprises the following steps:

s1, adding a ground wire GND in a power distribution protection system such as a TT system or a TN-S system and the like, wherein the ground wire GND is used as a reference ground for lamp post voltage (detection voltage), if the ground wire is added in the TT system, the three-phase four-wire is changed into the three-phase five-wire, as shown in FIG. 3, and if the ground wire is added in the TN-S system, the three-phase five-wire is changed into the three-phase six-wire, as shown in FIG. 4;

s2, connecting a voltage transformer with a lamp post and a ground wire GND, transmitting the detected voltage of the lamp post to the ground wire to a metering chip for data acquisition, then transmitting the data to a street lamp controller, and processing the acquired data by a microcontroller unit (MCU) of the street lamp controller to obtain a ground voltage value of the lamp post.

Fig. 5 is a block diagram of a street lamp controller according to an embodiment of the present utility model, where the street lamp controller may perform real-time control, status monitoring, patrol and alarm on a street lamp, and provide visual data analysis for a street lamp management department, so as to achieve the purposes of reducing street lamp illumination energy consumption and improving street lamp management efficiency. As shown in fig. 5, the street lamp controller of this embodiment includes a power supply unit, a microcontroller unit, and a street lamp line voltage sampling unit, a street lamp line current sampling unit, a drain voltage detecting unit, a drain current detecting unit, a PWM dimming unit, a metering circuit, an indicator light unit, a communication unit, and a storage unit electrically connected to the microcontroller unit, where the power supply unit supplies power to the above units. The memory cell of this embodiment employs an EEPROM data memory. The microcontroller unit is a metering center and a control center of the street lamp controller and is used for metering total electric energy in real time and measuring real-time voltage, current, active power, power factors and the like; the microcontroller unit is connected with the communication module, and sends the collected data to the outside (master station) through the communication module, and the microcontroller unit can also output dimming signals to the PWM dimming unit to control the switch and the brightness of the street lamp.

The street lamp line voltage sampling unit of the embodiment comprises a resistor voltage division sampling circuit, acquires the line voltage of the street lamp by using a resistor voltage division method, and sends the acquired real-time voltage value to the microcontroller unit. The street lamp line current sampling unit of the embodiment comprises a manganese copper sampling resistor, and the acquired real-time current value is sent to the microcontroller unit. The leakage voltage detection unit of the embodiment comprises a voltage transformer (PT) for measuring the voltage between a lamp post and a ground wire (GND) in a power distribution protection system, the collected leakage voltage value is sent to a microcontroller unit, the microcontroller unit judges whether leakage occurs according to the measured leakage voltage value, and if the leakage voltage value exceeds a safety voltage, the leakage is considered to occur, and alarm reporting is carried out through a communication unit. For the lighting street lamp, the industry regulated safety voltage is not higher than 36V, the continuous contact safety voltage is 24V, the safety current is 10mA, and the grade of the leakage accident can be determined according to the comparison between the leakage voltage value and the safety voltage or the continuous contact safety voltage. The leakage current detection unit of the embodiment comprises a Current Transformer (CT), the current transformer sends acquired leakage current values to the microcontroller unit, and when the measured leakage current values exceed safe current, the microcontroller unit alarms and reports through the communication unit. The PWM dimming unit controls the street lamp according to the PWM signal output by the microcontroller unit, and stepless dimming with the brightness ranging from 0% to 100% can be realized. The communication unit of the embodiment is an NB-IOT communication module and is used for communication between the street lamp controller and the master station, so that remote data interaction between the master station and the street lamp controller is realized. The NB-IOT communication scheme has the characteristics of low cost, long communication distance, low power consumption and the like. The indicator light circuit comprises an operation state indicator light, a network state indicator light, a communication state indicator light and the like, and displays the state of the road lamp controller. The power supply unit of the embodiment can output three voltages of 12V, 5V and 3.3V, wherein 12V supplies power to the switch control circuit and the PWM dimming unit, 5V supplies power to the metering circuit, and 3.3V supplies power to the microcontroller unit. Further, the street lamp controller also comprises a local maintenance serial port circuit, which is used for setting local parameters and maintaining interfaces.

According to the lamp post leakage voltage detection method, the ground wire is added to the power distribution protection system, the ground wire of the power distribution protection system is used as the reference ground of detection voltage, and the situation that leakage voltage measurement is inaccurate and misjudgment is caused due to the fact that the voltage of the street lamp is carried by the street lamp when a leakage accident occurs can be avoided. Still other methods measure the voltage between the lamp pole probe line contact and the PE line contact by providing a ground probe line connected to the lamp pole, but this method cannot measure the voltage to ground of the lamp pole. The method can accurately detect the leakage voltage of the lamp post only by adding one ground wire in the power distribution protection system, and has low cost and easy realization.

The utility model also provides a lamp post leakage voltage detection system, which comprises a power distribution protection system and a street lamp controller, wherein the power distribution protection system supplies power for a three-phase four-wire system or a three-phase five-wire system, and comprises a live wire, a working zero wire and a ground wire, or comprises the live wire, the working zero wire, the protection zero wire and the ground wire. The street lamp controller comprises a microcontroller unit and a drain voltage detection unit electrically connected with the microcontroller unit, wherein the drain voltage detection unit is used for detecting the voltage of the lamp post to the ground wire (namely the voltage value of the lamp post to the ground), and sending the detected voltage to the microcontroller unit after data acquisition by the metering chip. The microcontroller unit is used for judging whether the lamp post is in electric leakage or not according to the collected voltage value to the ground of the lamp post. The street lamp controller adopts the leakage voltage and leakage current detection technology, so that the leakage condition can be judged more comprehensively and accurately, and when the leakage current and the leakage voltage exceed the safety current and the safety current range, power-off protection measures are taken, so that the safety and the reliability of a street lamp system are improved.

In the system provided in the above embodiment, when the above method for detecting a leakage voltage of a lamp pole is executed, only the division of the above functional modules is used for illustration, in practical application, the above functional allocation may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above. In addition, the lamp pole leakage voltage detection system and the lamp pole leakage voltage detection method provided in the above embodiments belong to the same concept, which embody the implementation process in detail and are not described herein again. The conception of the lamp pole leakage voltage detection system is the same as that of the lamp pole leakage voltage detection method, the technical effects brought by the lamp pole leakage voltage detection system are the same, and the specific process can refer to the description of the lamp pole leakage voltage detection method, and the description is omitted here.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The lamp pole leakage voltage detecting system for street lamp lighting system, its characterized in that includes:

the power distribution protection system comprises a live wire, a working zero wire and a ground wire, or comprises a live wire, a working zero wire, a protection zero wire and a ground wire;

the street lamp controller comprises a microcontroller unit and a drain voltage detection unit electrically connected with the microcontroller unit, wherein the drain voltage detection unit is used for detecting the voltage of a ground wire in the power distribution protection system, which is used as the drain voltage of a lamp post, and sending the voltage to the microcontroller unit, and the microcontroller unit is used for judging whether the lamp post is leaked or not according to the detected drain voltage value.

2. A pole leakage voltage detection system according to claim 1, wherein: the power distribution protection system is a TT system, and the TT system comprises a live wire, a working zero wire and a ground wire and supplies power for a three-phase five-wire system.

3. A pole leakage voltage detection system according to claim 1, wherein: the power distribution protection system is a TN-S system, and the TN-S system comprises a live wire, a working zero wire, a protection zero wire and a ground wire and supplies power for a three-phase six-wire system.

4. A pole leakage voltage detection system according to claim 1, wherein: the street lamp controller also comprises a street lamp line voltage sampling unit, a street lamp line current sampling unit, a leakage current detection unit, a PWM dimming unit, a metering circuit, an indicator lamp unit, a communication unit, a storage unit and a power supply unit for supplying power to the above units, wherein the street lamp line voltage sampling unit, the street lamp line current sampling unit, the leakage current detection unit, the PWM dimming unit, the metering circuit, the indicator lamp unit, the communication unit and the storage unit are electrically connected with the microcontroller unit.

5. A pole leakage voltage detection system according to claim 1, wherein: the leakage voltage detection unit is a voltage transformer, and the voltage transformer is connected with the lamp post and the ground wire in the distribution protection system.

6. A pole leakage voltage detection system according to claim 4, wherein: the communication unit is an NB-IOT communication module.

7. A pole leakage voltage detection system according to claim 1, wherein: the street lamp line voltage sampling unit is a resistor voltage division sampling circuit.

8. A pole leakage voltage detection system according to claim 1, wherein: the street lamp line current sampling unit is a manganese-copper sampling resistor.

9. A pole leakage voltage detection system according to claim 1, wherein: the leakage current detection unit is a current transformer.