CN213302420U

CN213302420U - Multifunctional online detector for lightning arrester

Info

Publication number: CN213302420U
Application number: CN202022337584.5U
Authority: CN
Inventors: 张之鹏; 范永强; 王君超
Original assignee: Liaoning Desheng Shanggu Technology Co ltd
Current assignee: Liaoning Desheng Shanggu Technology Co ltd
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-05-28
Anticipated expiration: 2030-10-20

Abstract

The utility model belongs to the electric power system field, the multi-functional online detector of arrester promptly. The method is suitable for online detection of various lightning arresters in national grid high and medium voltage power distribution systems and industrial enterprise power supply systems. The control circuit comprises a current sampling module, a CPU data processing module, a data storage module and a data display module which are connected in sequence; the current sampling module is connected with a high-precision current transformer for measuring the leakage current of the lightning arrester and a large-transformation-ratio current transformer for measuring the discharge current of the lightning arrester. The data storage module is connected with the data remote transmission module and the terminal display module. The leakage current of the lightning arrester is measured by means of the precision current transformer, so that the resistive current for determining the quality of the lightning arrester is obtained, the resistive current for measuring the lightning arrester is a determining factor for detecting the quality of the lightning arrester, and the fault of the lightning arrester is found in time. Is an upgrading substitute product of the traditional lightning arrester counter.

Description

Multifunctional online detector for lightning arrester

Technical Field

The utility model belongs to the electric power system field, the multi-functional online detector of arrester promptly. The method is suitable for online detection of various lightning arresters in national grid high and medium voltage power distribution systems and industrial enterprise power supply systems.

Background

In the prior art, the arrester is applied to electric power system and enterprise power supply system, is one of the indispensable important equipment of electric power system and enterprise power supply system, and the main effect of arrester is the lightning current that can release rapidly when electrical equipment falls out of the thunder to protection equipment does not receive the damage, and the arrester also gives consideration to in time releasing electric power system's inside overvoltage simultaneously, the responsibility of protection equipment.

The multifunctional online detector for the lightning arrester can only record the action times of the lightning arrester and detect the leakage full current of the lightning arrester. The function is single, the requirement of comprehensively detecting the lightning arrester can not be met,

the lightning arrester has the advantages of small application range, single function, no memory and storage function, and no effective detection function for the self-damage of the lightning arrester.

The lightning arrester is directly connected to the wire and the bus, and if the lightning arrester is damaged, punctured or exploded, a short-circuit accident is caused, the system safety is threatened, and power failure is caused. Therefore, it is important to detect the quality of the arrester itself and prevent the arrester from being out of order. The damage of the lightning arrester comprises insulation damage and valve plate damage, and if the valve plate or the insulation is defective, the damage can develop gradually to finally cause the breakdown or explosion of the lightning arrester.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the aforesaid not enough and provide a running state and the inside hidden danger that can reflect the arrester comprehensively to in time report to the police and in time change when the abnormal running state of arrester, prevent the multi-functional on-line measuring appearance of puncture or explosion accident.

The technical solution of the utility model is that: the multifunctional online detector for the lightning arrester is characterized in that a control circuit of the multifunctional online detector comprises a current sampling module, a CPU data processing module, a data storage module and a data display module which are connected in sequence; the current sampling module is connected with a high-precision current transformer for measuring the leakage current of the lightning arrester and a large-transformation-ratio current transformer for measuring the discharge current of the lightning arrester. The data storage module is connected with the data remote transmission module and the terminal display module.

The multifunctional online detector for the lightning arrester carries out comprehensive operation processing on the received various information through the central CPU processor, and stores and remotely transmits all data to realize various detection functions, thereby being an upgrading product of the traditional multifunctional online detector for the lightning arrester.

And (3) detecting the leakage current of the lightning arrester: the high-precision current transformer is adopted to measure the leakage current of the lightning arrester, and when the lightning arrester acts, the circuit is automatically locked, so that the damage of components is prevented. In the defect development process of the lightning arrester, the leakage current of the lightning arrester exceeds the normal standard and gradually increases, and finally is damaged due to overheating. Therefore, detecting the leakage current of the lightning arrester during operation is an important means for judging whether the lightning arrester is defective or not.

And (3) resistive leakage current measurement: the leakage total current can be detected by the high-precision current transformer, the capacitance to the ground of the lightning arrester can be measured, the system voltage is known, the capacitive current of the lightning arrester can be calculated, the total current is measured, and the resistive current can be obtained if the capacitive current is known. The resistive current is leakage current of the valve plate of the lightning arrester, if the valve plate is defective or aged, the resistive current can be increased, active loss is increased, the lightning arrester generates heat, and finally breakdown and explosion are caused by thermal breakdown, so that the measurement of the resistive current of the lightning arrester is a determining factor for detecting the quality of the lightning arrester.

And (3) lightning arrester discharge current measurement: the discharge current of the lightning arrester is measured by a current transformer with a large transformation ratio, and the measured value is stored and displayed.

Data processing: the obtained data is stored for inquiry, and the stored data can be transmitted to various terminal devices through a wireless network.

The leakage current of the lightning arrester comprises capacitive current, resistive current and pollution current, wherein the pollution current is very small and negligible, the capacitive current is determined by the internal structure of the lightning arrester and basically does not change under a certain system voltage unless the structure changes.

The technical principle is as follows:

the leakage current of the lightning arrester comprises resistive current and capacitive current, and the pollution current is negligible due to small numerical value. At present, the total current can be measured, and because the resistive current is variable, the included angle between the resistive current and the capacitive current is also variable, and the included angle is unknown, so that the resistive current cannot be known. If can obtain system's voltage, just can know voltage and leakage current's contained angle, and then try to get the numerical value of capacitive current and resistive current, however, the system is the high voltage, gets voltage and needs complicated circuit, must also consider insulating yet, will make the tester highly complicated huge, it is unrealistic basically.

It is known that the leakage current is mainly composed of a capacitive current and a resistive current, and if the magnitude of the capacitive current is known and the total current is known, the resistive current can be calculated. The capacitive current is mainly related to the voltage to ground of a system and the structural form of an arrester, the voltage to ground of the system can be considered to be quantitative, the structural form of the arrester is also quantitative, and only the resistive current is variable. The capacitance of the lightning arrester can be measured, the capacitance of the lightning arrester of the same type of the same manufacturer is the same, the capacitance can be measured through an instrument, the system voltage is known, the capacitive current can be obtained, the leakage total current can be measured, the capacitive current can be obtained, and the resistive current can be obtained.

Capacitive reactance: r_c=1/（2πfC）=1/(2×3.14×50×C)=0.00318471/C

Wherein R is_cCapacitive reactance

f-system frequency

C-capacitance value is given as μ F

Capacitive current:

I_c=U_{phase (C)}/ R_c

Wherein I_c-capacitive current

U_{Phase (C)}-system phase voltage

Resistive current

I_R=

I_XQFull current of leakage of lightning arrester (measurable)

The original counter only has two functions of leakage total current and counting, and the new detector is added with the functions of detecting the resistive leakage current and the amplitude of the action current.

The original counter can only record the action times of the lightning arrester, and the new detector can record the times and can also record the time and the current amplitude of each time.

The utility model has the advantages that: 1. the measuring items are many, and are multiple functional, and data processing computing power is strong, can realize the data teletransmission. The leakage current of the lightning arrester is measured by means of the precision current transformer, so that the resistive current for determining the quality of the lightning arrester is obtained, the resistive current for measuring the lightning arrester is a determining factor for detecting the quality of the lightning arrester, and the fault of the lightning arrester is found in time. The discharge current of the arrester can be measured and recorded. The lightning arrester monitoring system has a recording function, and can know the action condition of the lightning arrester and the current amplitude, time and the like of each action through recorded data analysis. All information can be transmitted to various terminal devices through a wireless network and displayed. 2. Can replace analog quantity equipment in the past with digital equipment, it is higher to have measurement accuracy, and the reliability is stronger, and data processing is more convenient, possesses advantages such as information teletransmission function and multiple parameter measurement, is the upgrading substitute product of traditional arrester counter.

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a working principle diagram of the present invention.

Detailed Description

Referring to fig. 1, a control circuit of the multifunctional online detector for the lightning arrester comprises a current sampling module, a CPU data processing module, a data storage module and a data display module which are connected in sequence; the current sampling module is connected with a high-precision current transformer for measuring the leakage current of the lightning arrester and a large-transformation-ratio current transformer for measuring the discharge current of the lightning arrester. The data storage module is connected with the data remote transmission module and the terminal display module.

A current sampling module: the current collected by the current transformer is sampled and A/D converted, and converted into digital signals for processing and calculation by a CPU.

A CPU data processing module: and processing and calculating the current value, such as multiplying the current value by a transformer transformation ratio and other functions, coefficients and the like.

A data storage module: the data processed by the CPU is stored together with information such as date and current type, so as to be inquired later.

A data display module: the data display module is a liquid crystal display screen and displays various data on the display screen so as to be convenient for people to check.

The data remote transmission module: the SIM card of the mobile phone is adopted, and the cloud server is used for transmitting data to a far end, so that the data can be obtained without people going to the field.

A terminal display module: through the data of the cloud server, the monitoring data of the detector can be logged in and displayed on a mobile phone or any one of the networked computers, and the display devices are the terminal display modules.

The multifunctional online detector for the lightning arrester measures the capacitance to the ground of the lightning arrester, calculates the capacitive current value and sets the parameters of the multifunctional online detector for the lightning arrester. The power supply of the detector is suitable for three modes, namely alternating current 220V power supply, solar energy and rechargeable battery power supply, and the rechargeable battery can be continuously replaced for one year after the rechargeable battery is expired. The multifunctional lightning arrester on-line detector replaces the original lightning arrester counter.

The above description is only exemplary of the present invention, and the various illustrations do not limit the essence of the present invention.

Claims

1. The multifunctional online detector for the lightning arrester is characterized in that a control circuit of the multifunctional online detector comprises a current sampling module, a CPU data processing module, a data storage module and a data display module which are connected in sequence; the current sampling module is connected with a high-precision current transformer for measuring the leakage current of the lightning arrester and a large-transformation-ratio current transformer for measuring the discharge current of the lightning arrester.

2. The multifunctional on-line detector for the lightning arrester as claimed in claim 1, wherein the data storage module is connected with the data remote transmission module and the terminal display module.