Manufacturer of lightning arrester online monitoring system

Manufacturer of lightning arrester online monitoring system

Monitoring significance

Metal oxide zinc arrester is one of the key equipment in power equipment, and the resistive current passing through the arrester is an important indicator to measure the insulation degree of the arrester. Real time online monitoring of the full current, resistive current, capacitive current, lightning strike frequency, and lightning strike time of the lightning arrester can achieve real-time monitoring of the insulation condition of high-voltage electrical equipment; At the same time, by analyzing monitoring data, potential faults of metal oxide zinc lightning arresters can be detected in a timely manner and important data basis can be provided for condition based maintenance, providing a strong and reliable guarantee for the safe, reliable, stable, and economical operation of the power system. Reliable equipment insulation information and scientific maintenance basis can be provided for operation and maintenance personnel, thereby reducing the occurrence of accidents, extending maintenance intervals, reducing the frequency and time of power outage maintenance, improving equipment utilization and overall economic benefits.

Qualification Certificate

System Composition

JC-OM200Lightning arrester online monitoring deviceReal cashMonitoring of insulation performance of zinc oxide lightning arrester, divided intoJC-OM200/MOAandJC-OM200/PTTwo sub models:

JC-OM200/MOA is used to collect the leakage current, lightning strike frequency, and lightning strike events of one lightning arrester;

JC-OM200/PT is used to collect the 3-phase voltage of the busbar where the lightning arrester is located.

JC-OM200Lightning arrester online monitoring deviceWith JC-9000Intelligent online monitoring IED and status monitoring integrated server, jointly constructedbecomeLightning arrester online monitoring systemThe system composition is shown in the figure. By adopting advanced hierarchical distributed structure, applying bus control technology and modular design principles, the anti-interference performance, measurement accuracy and stability of the system have been greatly improved, meeting the requirements of engineeringPractical requirements for on-site operation, and the use of expert diagnostic systems for scientific analysis and diagnosis of collected data, to facilitate timely and convenient understanding and mastery of the health status of substation equipment.

By monitoring the full current, resistive current, capacitive current, lightning strike frequency, and lightning strike time of the lightning arrester in real time, analyzing and fitting the monitored data, and combining it with the on-site working conditions, problems such as ceramic bushing leakage current or insulation rod leakage current increase caused by pollution or internal moisture of the lightning arrester can be detected in a timely manner to avoid accidents.

System Architecture Diagram

System Features

1. Adopting high-precision active zero flux through type transformers, the amplification factor is automatically selected based on the measured current to achieve high-precision measurement

2. Using dynamic phasor compensation algorithm to achieve high-precision measurement signal analysis

3. Adopting digital filtering algorithm to eliminate the "zero drift problem" caused by analog filters

4. Adopting a distributed measurement structure, namely on-site measurement and digital transmission

5. Can be installed with electricity, which means there is no need for the main equipment to be powered off for installation, making it convenient and fast to connect to the system

System functions

The JC-OM200 device adopts a modular design, and each device samples the ABC three-phase current of the lightning arrester or simultaneously collects the ABC three-phase voltage of the busbar. At the same time, it also collects the amplitude and phase of the public power supply 220V, providing calculation and comparison data for the acquisition control unit. Each device has CAN or 485 communication function, and the devices are interconnected through a bus.

The specific functions are as follows:

1. Collect the leakage current and reference voltage of the lightning arrester device, calculate the fundamental wave and 3rd, 5th, 7th, and 9th harmonics of the lightning arrester leakage current, and count the number and duration of lightning strikes.

2. Collect PT unit bus voltage and reference voltage, calculate the fundamental wave and 3rd, 5th, 7th, and 9th harmonics of the bus voltage.

3. CAN or 485 network communication

4. Real time clock: Each device has the function of a real-time clock

5. Temperature and humidity acquisition and control: high-precision temperature and humidity sensors are used to collect real-time temperature and humidity inside the device.

6、IEC61850 通信

Technical Specifications

1. Working environment
lWorking voltage: AC220V±10%,50Hz

Power consumption:<5W at rated voltage

Environmental temperature

Indoor system: -10 ℃~+55 ℃

Outdoor system: -25 ℃~+70 ℃

Working environment humidity: ≤ 95%

2. Monitoring parameter indicators

Measure currentRange: 0.05mA~650mA, measurement accuracy ± 1%

Measurement of Bus VoltageRange: 35kV~1000kV, measurement accuracy 0.5%

Harmonic voltage measurement range: 3, 5, 7, 9 times, measurement accuracy ± 2%

System frequency measurement range: 45-65Hz, measurement accuracy ± 0.001Hz

Record of lightning strikes: 0-255, year month day hour minute second

Temperature: -20 ℃~80 ℃, ± 1%

Humidity: 0-100% RH, ± 1%

3 Other technical indicators

System capacity: 80 local modules

Monitoring cycle: Factory set 1 hour

Shortest monitoring period: 5 minutes

CAN network structure, network speed:<500Kbps

RS485 structure, network speed: ≤ 2400bps

The system has a lifespan of at least 3 years.

The average working time (MTBF) of the system: indoor: greater than 5 × 104 hours.

Outdoor: More than 3 x 104 hours.

On site case