CN202720299U - Insulator Leakage Current Online Monitoring System - Google Patents

Abstract

The utility model discloses an on-line monitoring system for insulator leakage current, which comprises a power supply device, a current collection terminal and a monitoring base station; wherein, the power supply device is directly connected to the current collection terminal, and the current collection terminal communicates with the current collection terminal through a wireless communication network. The monitoring base stations are connected. The utility model realizes the real-time, accurate and reliable monitoring of the leakage current and the pollution condition on the surface of the insulator; moreover, the utility model has strong environmental adaptability and high reliability; it is easy to disassemble and move, and can be installed in a temporary use place at any time.

Description

Insulator Leakage Current Online Monitoring System

technical field

The utility model relates to the technical field of high-voltage power transmission, in particular to an on-line monitoring system for insulator leakage current.

Background technique

High-voltage transmission line towers are responsible for the important task of transmitting and distributing electric energy, and are an important link in the power system. The reliability of transmission lines directly affects the safe and reliable operation of power systems. The failure of insulators is the main reason that threatens the safe operation of transmission lines. According to statistics, insulator faults account for the first place among all faults on transmission lines, and the tripping rate caused by insulator flashover caused by lightning strikes accounts for more than 60% of the total line tripping rate, and the power loss caused by dirty flashover of insulators is 9-10% of lightning damage. times, frequent insulator drop series has expanded the accident, prolonging the power outage time, and seriously affecting power transmission. In order to ensure the safe operation of high-voltage transmission line towers, they need to be checked and measured frequently.

At present, the detection of the operating status of high-voltage transmission line towers is generally carried out by manual inspection. This method makes the measurement greatly affected by subjective factors, and it is difficult to ensure the accuracy of the results. At the same time, it cannot achieve real-time online measurement.

Utility model content

The utility model aims to provide an on-line monitoring system for the insulator leakage current, which can collect the leakage current of the line pole tower in real time, accurately and reliably, and then find out the operation status of the line pole tower insulator in time.

An on-line monitoring system for insulator leakage current of the utility model includes: a power supply device, a current collection terminal and a monitoring base station; wherein, the power supply device is directly connected to the current collection terminal, and the current collection terminal communicates with the The monitoring base station is connected.

Preferably, in the above online monitoring system, the power supply device includes a connected battery and a power management module; and, the output terminal of the power management module is connected to the current collection terminal.

Preferably, in the above-mentioned online monitoring system, the current acquisition terminal includes a shut-off ring, a signal conditioning conversion unit, a processor unit, and a wireless communication module; wherein, the input end of the shut-off ring is set at the end of the insulator porcelain bottle of the power transmission line tower, and the cut-off ring The output end of the loop is connected to the input end of the signal conditioning conversion unit, and the output end of the signal conditioning conversion unit, the processor unit and the wireless communication module are sequentially connected.

Preferably, in the above online monitoring system, the signal conditioning conversion unit includes a low-pass filter circuit, a high-pass filter circuit, a secondary amplification circuit, an absolute value circuit, an AD conversion unit, and a high-frequency current pulse capture unit; wherein, the low The input end of the pass filter circuit and the input end of the high pass filter circuit are all connected to the output end of the choke ring, and the output end of the low pass filter circuit, the secondary amplification circuit, the absolute value circuit and the AD conversion unit are sequentially connected; The output end of the filter circuit is connected to the input end of the high-frequency current pulse capture unit; the output end of the AD conversion unit and the output end of the high-frequency current pulse capture unit are both connected to the processor unit.

Preferably, in the above online monitoring system, the processor unit is a DSP digital signal processor.

Preferably, in the above online monitoring system, the wireless communication module is based on serial communication, the carrier frequency is 433MHZ, the interface baud rate is 9600bps, the format is 8N1, and the maximum transmission distance is 800m.

Preferably, in the above online monitoring system, the maximum transmission power of the wireless communication network is 17dBm, and the carrier frequency is 433MHz.

Preferably, in the above-mentioned online monitoring system, the monitoring base station is set on a power transmission line tower, connected to a current collection terminal through a wireless communication network, and used for sending and receiving collected leakage current and related calculation data.

In the utility model, the current acquisition terminal is used as a monitoring sensor, and the on-site measured data and early warning/alarm information are transmitted to the monitoring base station through wireless communication, realizing real-time, accurate and reliable monitoring of the leakage current and the pollution status of the insulator surface At the same time, the online monitoring system of the utility model also has the advantages of strong environmental adaptability, high reliability, and convenient disassembly and movement.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the insulator leakage current on-line monitoring system of the utility model;

Fig. 2 is the electrical principle diagram of the power supply device in the embodiment of the insulator leakage current online monitoring system of the utility model;

Fig. 3 is a schematic diagram of the structure of the current collection terminal in an embodiment of the on-line monitoring system for insulator leakage current of the present invention;

Fig. 4 is an electrical schematic diagram of the signal conditioning conversion unit of the current collection terminal in the embodiment of the on-line monitoring system for insulator leakage current of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

Refer to Figure 1. Fig. 1 is a structural schematic diagram of an embodiment of an on-line monitoring system for insulator leakage current. The insulator leakage current on-line monitoring system includes a power supply device 1 , a current collecting terminal 2 , a wireless communication network 3 and a monitoring base station 4 . The power supply device 1 is directly connected to the current collection terminal 2, and the monitoring base station 4 communicates with the current collection terminal 2 through the wireless communication network 3 to control the current collection terminal 2 and complete the collection and calculation of the leakage current of the insulator; and it can be compared with historical data For comparison, it also has an alarm function. After the data exceeds the set range, the alarm can be used to remind the user to respond, thereby realizing online monitoring.

Refer to Figure 2. FIG. 2 is an electrical schematic diagram of the power supply device 1 in an embodiment of the on-line monitoring system for insulator leakage current of the present invention. The power supply device 1 includes a battery 11 and a power management module 12 ; wherein, the battery 11 is respectively connected to the input end of the power management module 12 , and the output end of the power management module 12 is connected to the current collection terminal 2 .

During specific implementation, the storage battery 11 is used as a power supply, and the power supply device 1 is directly connected to the current collection terminal 2 to supply power to the signal conditioning conversion unit 22 , the processor unit 23 and the wireless communication module 24 .

Refer to Figure 3. Fig. 3 is a schematic structural diagram of the current collection terminal 2 in an embodiment of the on-line monitoring system for insulator leakage current of the present invention. The current acquisition terminal 2 includes a shut-off ring 21, a signal conditioning conversion unit 22, a processor unit 23, and a wireless communication module 24; wherein, the input end of the shut-off ring 21 is installed at the end of the insulator porcelain bottle on the tower of the high-voltage transmission line, and the shut-off ring 21 outputs terminal is connected to the input end of the signal conditioning conversion unit 22, and the output terminal of the signal conditioning conversion unit 22, the processor unit 23 and the wireless communication module 24 are sequentially connected.

During the implementation, the cut-off ring 21 is installed on the surface of the insulator sheet closest to the pole tower of the measured insulator string, and the leakage current on the surface of the insulator is intercepted. In order to make the copper ring fully contact with the surface of the insulator, conductive glue is applied during installation, which also plays a role in fixing effect. The intercepted leakage current is led to the input terminal of the signal conditioning conversion unit 22 through the shielded twisted wire, and the signal is sent to the wireless communication module 24 after being processed by the processor unit 23 to control the signal conditioning conversion unit 22 . The processor unit 23 uses a DSP digital signal processor to control data collection, signal conditioning and conversion unit 22 and wireless communication module 24 . The wireless communication module 24 is a general transparent wireless transmission module, the carrier frequency is 433MHZ, the interface baud rate is selected as 9600bps, the format is 8N1, data transmission is carried out according to the preset communication protocol, the maximum transmission distance is 800m, and the serial communication mode is adopted. Send and receive data and instructions between the current collection terminal 1 and the monitoring base station 3 .

Refer to Figure 4. Fig. 4 is an electrical schematic diagram of the signal conditioning conversion unit of the current collection terminal in the embodiment of the on-line monitoring system for insulator leakage current of the present invention. As shown in the figure, the signal conditioning conversion unit 22 includes a low-pass filter circuit 221 , a high-pass filter circuit 222 , a secondary amplification circuit 223 , an absolute value circuit 224 , an AD conversion unit 225 and a high-frequency current pulse capture unit ( 226 ). Wherein, the input ends of the low-pass filter circuit 221 and the high-pass filter circuit 222 are connected to the output end of the choke ring 21, and the output ends of the low-pass filter circuit 221, the secondary amplification circuit 223, the absolute value circuit 224 and the AD conversion unit 225 are sequentially connected , the output end of the high-pass filter circuit 222 is connected to the input end of the high-frequency current pulse capture unit 226 , the output end of the AD conversion unit 225 and the output end of the high-frequency current pulse capture unit 226 are connected to the processor unit 23 .

In practice, the low-pass filter circuit 221 and the high-pass filter circuit 222 are used to separate the two types of signal resistive leakage current and high-frequency pulse current. The secondary amplifying circuit 223 is an amplifying circuit with a gain of 10, which is composed of an operational amplifier, and performs secondary amplification on the power frequency current signal to improve the sensitivity and linearity of the measuring device. The combination of the absolute value circuit 224 and the AD conversion unit 225 can increase the range of the input voltage and increase the measurement range of the leakage current. The high-frequency current pulse capture unit 226 is used to capture high-frequency pulses with a frequency of tens of megahertz, and accurately record the number of leakage current pulses with different amplitudes.

The wireless communication network 3 is the communication mode between the current collection terminal 2 and the monitoring base station 4. It is transmitted by the wireless communication module with micro power, the maximum transmission power is 17dBm, and the carrier frequency is 433MHz. It provides a transparent data interface and can adapt to any standard or non-standard users. Protocol, automatically shielding external interference data, strong anti-interference performance.

The technical index of above-mentioned embodiment is specifically:

(1) Working environment

Temperature: -40°C～+85°C

Humidity: 0%RH～100%RH

(2) Measuring range

Leakage current measurement range: 0 ~ 100mA

(3) Measurement accuracy

Leakage current≤±1%

(4) Other technical indicators

Battery continuous power supply time: more than 10 years

Through the above analysis, it can be seen that the utility model embodiment has the following characteristics:

(1) The current acquisition terminal in this embodiment is used as a monitoring sensor, and the collected data is transmitted to the base station through the wireless communication network, and the leakage current is monitored online in real time, reflecting the pollution status of the insulator surface during operation in real time, and the on-site measured data and The early warning/alarm information is transmitted to the monitoring base station through wireless communication; it can be seen that this embodiment makes online monitoring more convenient, accurate and reliable, and realizes real-time remote real-time online monitoring.

(2) This embodiment conforms to the relevant technical standards (Q/GDW245-2008) of the state and power grid companies, with technical specifications, strong compatibility, and data sharing.

(4) This embodiment adopts a high-reliability system design, which is resistant to low temperature and strong electromagnetic interference, and has strong environmental adaptability.

(5) The wireless communication module used in this embodiment is small in size, low in power consumption, strong in anti-interference ability, long in transmission distance, high in reliability, and meets design requirements.

(6) This embodiment can be disassembled and moved, and can be conveniently installed in a temporary place of use.

The insulator leakage current on-line monitoring system provided by the utility model has been introduced in detail above. The principle and implementation of the utility model have been explained by using specific examples in this paper. The description of the above examples is only used to help understand the present invention. The method of the utility model and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the utility model, there will be changes in the specific implementation and application range. To sum up, the contents of this specification should not be understood as limiting the utility model.

Claims (8)

1. An insulator leakage current on-line monitoring system, characterized by includes:

the device comprises a power supply device (1), a current acquisition terminal (2) and a monitoring base station (4);

the power supply device (1) is directly connected with the current acquisition terminal (2), and the current acquisition terminal (2) is connected with the monitoring base station (4) through a wireless communication network (3).

2. The on-line monitoring system of claim 1,

the power supply device (1) comprises a storage battery (11) and a power supply management module (12) which are connected; and,

the output end of the power supply management module (12) is connected with the current acquisition terminal (2).

3. The on-line monitoring system of claim 2,

the current acquisition terminal (2) comprises a cutoff ring (21), a signal conditioning and converting unit (22), a processor unit (23) and a wireless communication module (24);

the input end of the cutoff ring (21) is arranged at the tail end of an insulator porcelain bottle of a power transmission line tower, the output end of the cutoff ring (21) is connected with the input end of the signal conditioning and converting unit (22), and the output end of the signal conditioning and converting unit (22), the processor unit (23) and the wireless communication module (24) are sequentially connected.

4. The on-line monitoring system of claim 3,

the signal conditioning and converting unit (22) comprises a low-pass filter circuit (221), a high-pass filter circuit (222), a secondary amplification circuit (223), an absolute value circuit (224), an AD converting unit (225) and a high-frequency current pulse capturing unit (226); wherein,

the input end of the low-pass filter circuit (221) and the input end of the high-pass filter circuit (222) are both connected with the output end of the cutoff ring (21), and the output end of the low-pass filter circuit (221), the secondary amplification circuit (223), the absolute value circuit (224) and the AD conversion unit (225) are sequentially connected;

the output end of the high-pass filter circuit (222) is connected with the input end of the high-frequency current pulse capturing unit (226); and

the output end of the AD conversion unit (225) and the output end of the high-frequency current pulse capture unit (226) are both connected with the processor unit (23).

5. An on-line monitoring system according to claim 3 or 4,

the processor unit (23) is a DSP digital signal processor.

6. The on-line monitoring device of claim 5, wherein:

the wireless communication module (24) is based on a serial communication mode, the carrier frequency is 433MHZ, the interface baud rate is 9600bps, the format is 8N1, and the maximum transmission distance is 800 m.

7. The on-line monitoring system of claim 1,

the maximum transmitting power of the wireless communication network (3) is 17dBm, and the carrier frequency is 433 MHz.

8. The on-line monitoring system of claim 1,

the monitoring base station (4) is arranged on the power transmission line tower, is connected with the current acquisition terminal (2) through the wireless communication network (3) and is used for receiving and transmitting the acquired leakage current and related calculation data.

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