CN205120890U - Electrified detecting system of high voltage cable termination arrester - Google Patents

Abstract

A live detection system for a lightning arrester at a high-voltage cable terminal belongs to the technical field of condition maintenance of electric equipment, and in particular relates to a live detection system for a lightning arrester at a high-voltage cable terminal. The utility model provides a live detection system for a lightning arrester at a high-voltage cable terminal with high safety, which can detect working problems of the lightning arrester in time and is convenient to use. The utility model includes a sensor and a hand-held terminal. The main points of the structure are that the sensor includes a core-through current transformer, a central processing unit, a clock circuit, a storage circuit, an input signal conditioning circuit and a communication circuit. Above, the signal output port of the feedthrough current transformer is connected to the signal input port of the input signal conditioning circuit, the signal output port of the input signal conditioning circuit is connected to the signal input port of the central processing unit, and the signal transmission port of the central processing unit is respectively connected to the The signal transmission port of the clock circuit is connected with the signal transmission port of the storage circuit.

Description

Live detection system for lightning arrester at high voltage cable terminal

technical field

The utility model belongs to the technical field of condition inspection and maintenance of electric equipment, in particular to a live detection system for a lightning arrester at a high-voltage cable terminal.

Background technique

The zinc oxide arrester at the terminal of the urban high-voltage cable line is an important overvoltage protection device, which provides an important guarantee for the safe and stable operation of the power grid. However, because there is no series gap, the zinc oxide arrester will gradually age or deteriorate due to the influence of normal working voltage, various internal overvoltages, lightning overvoltages and external environmental factors for a long time. If it is not paid attention to, it will be damaged or even exploded, making other The electrical equipment loses the overvoltage protection device, which endangers the safe and stable operation of the power system. Therefore, in order to discover hidden dangers of arresters in time, it is very important to monitor their operating status.

At present, in order to understand the operation status of the lightning arrester at the cable terminal, preventive tests are mainly carried out on the lightning arrester. However, it is difficult to carry out the preventive blackout test of the lightning arrester at the cable head of 66kV and above. The routine tests of surge arresters in the "Condition Maintenance Test Procedures" mainly have the following requirements: 66kV surge arresters should be tested for continuous current in operation every year (live); DC 1mA voltage test should be carried out regularly after power failure, and the power failure test cycle is 3 years (no continuous current detection) and 6 years (with continuous current detection). At present, the existing technical means cannot carry out live detection on the lightning arrester at the end of the cable, which means that a large number of lightning arresters need to be regularly tested for DC 1mA voltage. The DC test voltage of 220kV surge arrester needs to be increased to above 145kV, and the DC test voltage of 66kV surge arrester needs to be increased to above 130kV. Such a high test voltage is applied outdoors (mostly on the side of the road), and the high-voltage test line needs to be installed at a height of about 20 meters. At the lightning arrester at the site, the test is very difficult and dangerous. It needs a sufficient safety distance and enough people to take care of it. The test also has high requirements on weather conditions, and the test can only be carried out on sunny days and when the wind is small. Moreover, the preventive test also has problems such as long test period, untimely problem discovery, and high cost of test maintenance.

Contents of the invention

The utility model aims at the above-mentioned problems, and provides a live detection system of a high-voltage cable terminal lightning arrester with high safety, which can detect the working problems of the lightning arrester in time and is easy to use.

In order to achieve the above object, the utility model adopts the following technical scheme. The utility model includes a sensor and a hand-held terminal. Circuit, the feed-through current transformer is set on the grounding wire of the arrester, the signal output port of the feed-through current transformer is connected to the signal input port of the input signal conditioning circuit, and the signal output port of the input signal conditioning circuit is connected to the signal of the central processing unit The input port is connected, the signal transmission port of the central processing unit is connected with the signal transmission port of the clock circuit and the signal transmission port of the storage circuit respectively, and the signal output port of the central processing unit is connected with the signal input port of the communication circuit.

Described handheld terminal comprises ARM processor, clock unit, battery power supply and charging unit, storage unit, button unit, USB communication unit, wireless communication unit and display, the signal output port of ARM processor is connected with the signal input port of USB communication unit respectively , The signal input port of the display is connected, the power port of the ARM processor is connected with the power output port of the battery power supply and charging unit, and the signal input port of the ARM processor is respectively connected with the signal output port of the key unit and the signal output port of the wireless communication unit , the signal transmission port of the ARM processor is respectively connected to the signal transmission port of the clock unit and the signal transmission port of the storage unit; the wireless communication unit communicates wirelessly with the communication circuit.

As a preferred solution, the display of the utility model adopts a 4.3-inch TFT display screen.

As another preferred solution, the central processing unit of the utility model adopts C8051F005 chip U6, and the input signal conditioning circuit adopts OP07DP chips U7, U8, and 2 pins of U7 are connected with the signal output port of the described through-hole current transformer, Pin 3 of U7 is grounded, pin 6 of U7 is connected to pin 2 of U8 through a resistor R10, pin 3 of U8 is grounded, pin 6 of U8 is connected to pin 7 of U6 and one end of resistor R9 through a capacitor C37, and the other end of R9 is connected to One end of resistor R11, one end of capacitor C22, and pin 8 of LM385B chip U9 are connected, the other end of C22 is grounded, the other end of R11 is connected to power supply AV+ and one end of capacitor C20, and the other end of C20 is grounded.

Secondly, the interface circuit of the communication circuit described in the utility model adopts the TLP521 chip U10, the 4 pins of U10 are connected with the 56 pins of U6 and the anode of the diode D1 respectively, the cathode of D1 is connected with the 2 pins of U10, and the 1 pin of U10 is connected through the resistor R2 is connected to the power supply +3VD, and pin 3 of U10 is grounded.

In addition, the clock circuit described in the utility model adopts DS1308 chip U5, the 2nd and 3rd pins of U5 are respectively connected with the two ends of the crystal oscillator, the 6th pin of U5 is connected with the 52nd pin of U6, the 5th pin of U5 is connected with the 53rd pin of U6, Pin 7 of U5 is connected to pin 51 of U6, pin 1 of U5 is connected to the power supply +3VD and one end of capacitor C3, the other end of C3 is grounded, pin 8 of U5 is connected to the positive pole of the 3V battery, and the negative pole of the 3V battery is connected to pin 4 of U5 .

The utility model has beneficial effects.

1) The utility model adopts the through-hole current transformer set on the grounding lead wire of the arrester to obtain the leakage current signal. The obtained current signal can truly reflect the change of the leakage current of the arrester, and there is no electrical connection with the arrester, so it does not affect the operation of the arrester. any impact.

2) The hand-held terminal of the utility model includes a display, and the measurement information is displayed on the display, which is convenient for operation personnel to read and manage.

3) The signal transmission port of the central processor of the utility model is connected with the signal transmission port of the storage circuit, and the measurement data is stored in the storage circuit, which provides a basis for analyzing the operation of the arrester.

4) The wireless communication unit of the utility model communicates wirelessly with the communication circuit; it is convenient to use.

From the above, it can be known that the utility model can really carry out live detection work on the lightning arrester at the cable terminal, avoiding the problems caused by the blackout test in the past, and improving the safety of the test. , prevent the occurrence of faults, and have a positive effect on the safe operation of the power grid. The utility model is suitable for live detection of lightning arresters of various voltage levels, has broad application prospects, and has high promotion and use value.

Description of drawings

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. The scope of protection of the utility model is not limited to the expression of the following content.

Fig. 1 is the partial circuit schematic diagram of central processing unit of the present utility model.

Fig. 2 is a schematic diagram of the input signal conditioning circuit of the utility model.

Fig. 3 is a schematic diagram of the interface circuit of the communication circuit of the present invention.

Fig. 4 is the schematic diagram of the clock circuit of the utility model.

Fig. 5 is a functional block diagram of the handheld terminal circuit of the present invention.

detailed description

As shown in the figure, the utility model includes a sensor and a handheld terminal. The sensor includes a feed-through current transformer, a central processing unit, a clock circuit, a storage circuit, an input signal conditioning circuit, and a communication circuit. The feed-through current transformer is set in a lightning arrester On the ground lead, the signal output port of the feedthrough current transformer is connected to the signal input port of the input signal conditioning circuit, the signal output port of the input signal conditioning circuit is connected to the signal input port of the central processing unit, and the signal transmission port of the central processing unit They are respectively connected to the signal transmission port of the clock circuit and the signal transmission port of the storage circuit, and the signal output port of the central processing unit is connected to the signal input port of the communication circuit.

Described handheld terminal comprises ARM processor, clock unit, battery power supply and charging unit, storage unit, button unit, USB communication unit, wireless communication unit and display, the signal output port of ARM processor is connected with the signal input port of USB communication unit respectively , The signal input port of the display is connected, the power port of the ARM processor is connected with the power output port of the battery power supply and charging unit, and the signal input port of the ARM processor is respectively connected with the signal output port of the key unit and the signal output port of the wireless communication unit , the signal transmission port of the ARM processor is respectively connected to the signal transmission port of the clock unit and the signal transmission port of the storage unit; the wireless communication unit communicates wirelessly with the communication circuit.

The USB communication unit is used to connect with the computer, and the data of the handheld terminal is imported into the computer to read and store; the button unit is used to control and realize data retrieval, parameter setting and sending control instructions to communicate with sensors to obtain data; the wireless communication The unit is used for wireless communication and data interaction with the sensor.

The display adopts a 4.3-inch TFT display screen.

The central processing unit adopts C8051F005 chip U6, and the input signal conditioning circuit adopts OP07DP chips U7 and U8. The 2 pins of U7 are connected to the signal output port of the described through-hole current transformer, the 3 pins of U7 are grounded, and the 6 pins of U7 Connect to pin 2 of U8 through resistor R10, pin 3 of U8 is grounded, pin 6 of U8 is connected to pin 7 of U6 and one end of resistor R9 through capacitor C37, and the other end of R9 is connected to one end of resistor R11, one end of capacitor C22, and LM385B chip Pin 8 of U9 is connected, the other end of C22 is grounded, the other end of R11 is connected to the power supply AV+ and one end of capacitor C20, and the other end of C20 is grounded. C8051F005 chip has 12-bit AD and SPI, UART interface.

The interface circuit of the communication circuit adopts the TLP521 chip U10, the 4 pins of U10 are respectively connected with the 56 pins of U6 and the anode of the diode D1, the cathode of D1 is connected with the 2 pins of U10, and the 1 pin of U10 is connected with the power supply +3VD through the resistor R2 Connected, U10's 3 feet are grounded.

The clock circuit adopts DS1308 chip U5, the 2 and 3 pins of U5 are connected with the two ends of the crystal oscillator respectively, the 6 pins of U5 are connected with the 52 pins of U6, the 5 pins of U5 are connected with the 53 pins of U6, and the 7 pins of U5 are connected with the 53 pins of U6. Pin 51 of U6 is connected, pin 1 of U5 is connected to the power supply +3VD and one end of capacitor C3, the other end of C3 is grounded, pin 8 of U5 is connected to the positive pole of the 3V battery, and the negative pole of the 3V battery is connected to pin 4 of U5.

The working process of the present utility model is illustrated below in conjunction with accompanying drawings.

The leakage current of the lightning arrester passes through the through-hole current transformer of the utility model, and the current signal enters the input signal conditioning circuit and is converted into a voltage amplitude acceptable to the central processing unit, and finally enters the central processing unit for collection and storage in the storage circuit; Read the data results measured by the sensor through the handheld terminal, and analyze the operating status of the arrester.

It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solutions described in the embodiments of the utility model. Those of ordinary skill in the art should understand that the utility model can still be Modifications or equivalent replacements are carried out to achieve the same technical effect; as long as the needs of use are met, they are all within the protection scope of the present utility model.

Claims (5)

1. The electrified detection system of high-voltage cable terminal lightning arrester, including sensors and hand-held terminals, is characterized in that the sensors include feed-through current transformers, central processing units, clock circuits, storage circuits, input signal conditioning circuits and communication circuits, feed-through current transformers The transformer is set on the grounding wire of the arrester, the signal output port of the feed-through current transformer is connected to the signal input port of the input signal conditioning circuit, the signal output port of the input signal conditioning circuit is connected to the signal input port of the central processing unit, and the central processing unit The signal transmission port of the device is connected to the signal transmission port of the clock circuit and the signal transmission port of the storage circuit respectively, and the signal output port of the central processing unit is connected to the signal input port of the communication circuit; Described handheld terminal comprises ARM processor, clock unit, battery power supply and charging unit, storage unit, button unit, USB communication unit, wireless communication unit and display, the signal output port of ARM processor is connected with the signal input port of USB communication unit respectively , The signal input port of the display is connected, the power port of the ARM processor is connected with the power output port of the battery power supply and charging unit, and the signal input port of the ARM processor is respectively connected with the signal output port of the key unit and the signal output port of the wireless communication unit , the signal transmission port of the ARM processor is respectively connected to the signal transmission port of the clock unit and the signal transmission port of the storage unit; the wireless communication unit communicates wirelessly with the communication circuit. 2. According to claim 1, said high-voltage cable terminal lightning arrester charged detection system is characterized in that said display adopts a 4.3-inch TFT display. 3. According to claim 2, said high-voltage cable terminal lightning arrester live detection system is characterized in that said central processing unit adopts C8051F005 chip U6, and the input signal conditioning circuit adopts OP07DP chips U7, U8, and 2 pins of U7 are connected with said through-heart type The signal output port of the current transformer is connected, the 3rd pin of U7 is grounded, the 6th pin of U7 is connected with the 2nd pin of U8 through the resistor R10, the 3rd pin of U8 is grounded, and the 6th pin of U8 is respectively connected with the 7th pin of U6 and the resistor through the capacitor C37. One end of R9 is connected, and the other end of R9 is connected with one end of resistor R11, one end of capacitor C22, and pin 8 of LM385B chip U9. 4. according to the described high-voltage cable terminal lightning arrester charged detection system of claim 3, it is characterized in that the interface circuit of described communication circuit adopts TLP521 chip U10, and 4 pins of U10 are connected with 56 pins of U6, the anode of diode D1 respectively, and the anode of D1 The cathode is connected to pin 2 of U10, pin 1 of U10 is connected to the power supply +3VD through resistor R2, and pin 3 of U10 is grounded. 5. According to claim 4, said high-voltage cable terminal lightning arrester charged detection system is characterized in that said clock circuit adopts DS1308 chip U5, and 2 and 3 pins of U5 are respectively connected with the two ends of the crystal oscillator, and 6 pins of U5 are connected with 52 pins of U6. Pin 5 of U5 is connected to pin 53 of U6, pin 7 of U5 is connected to pin 51 of U6, pin 1 of U5 is connected to power supply +3VD and one end of capacitor C3, the other end of C3 is grounded, pin 8 of U5 is connected to The positive pole of the 3V battery is connected, and the negative pole of the 3V battery is connected to pin 4 of U5.