Nowadays, intelligent, big data and cloud technologies make large-scale video surveillance more practical, which can save manpower and monitoring equipment, and will have broad application prospects in the public security industry. With the development of information technology, what innovative technologies will emerge in the field of public security video surveillance in the future? How do these innovative technologies affect the construction of public safety video surveillance networking? The following small series for everyone to check one by one.
At present, in the public security work, the most practical application is to find images with the same clue characteristics from the massive video data, so that the police can find new case clues. As for "how to find?", the biggest technical obstacle is the structuring of video.
From the perspective of video analysis and intelligent vision, we can use some intelligent analysis methods to automatically collect some commonly used "metadata" information from a large number of pure video, and re-image the video information by means of data TAG. Organization, long-term storage, in preparation for "wartime" emergency, complete the patchwork of criminals' behavior.
Cloud technology: Promote a more balanced, flexible and reliable video surveillance system
Cloud storage technology uses a distributed file system as its basic feature, combining a traditional three-tier storage architecture (file system, volume manager, and RAID) into a unified software layer to create a single across all nodes in the storage system. Intelligent file system. The system data and management data (metadata) of the distributed file system are distributed on each node, which avoids system resource contention and eliminates system bottlenecks. Even if an entire node fails, the system can automatically identify the faulty node and automatically recover the faulty node. The data and metadata involved make the fault transparent to the business and does not affect business continuity at all.
Intelligent Video Analytics: Development for compatibility, real-world annotation, and virtual tiered deployment
Intelligent video analysis is an intelligent monitoring technology based on target behavior. It separates the background and target in the scene, identifies the real target, removes background interference, and analyzes and tracks the target behavior appearing in the camera scene. The current video intelligence analysis field has the following technological innovation capabilities:
1. Video compatibility: In practical applications, the investigator only needs to upload the video, and does not need to record the monitoring device manufacturer model. The system will automatically identify the video format encapsulation and code stream for video preprocessing. It can support the video format of mainstream DVR and NVR manufacturers to play directly. It can also convert the private video formats of different manufacturers into a unified format to play with standard video players. It can use video restoration technology to lose file index and damage the file header. Damaged video files caused by loss of some content, etc. are restored and restored.
2, electronic labeling: through the standard electronic standard dictionary (standardized target description term library) on the relevant evidence in the case evidence, including people, vehicles and things electronically labeled, standardize the case description mode and management methods, as a full-text search The basic keywords improve the effectiveness of the string analysis and expand the source of the investigation leads to speed up the resolution of the case.
3, virtual bayonet: rely on the virtual trigger of the road high-definition camera to achieve the function of the conventional bayonet, to achieve urban virtual bayonet network control. Auditing control means that the system will start the background analysis node according to the user's deployment control strategy, and the license plate information of the HD camera video or video corresponding to the front end, through the intelligent analysis algorithm for vehicle capture and license plate recognition, and according to the blacklist set by the user or Customize the license plate library for matching and generate a warning.
4, intelligent camera: promote the construction of video surveillance system to intensive, efficient camera intelligent in high-definition, low illumination, wide dynamics, security, and front-end intelligent analysis.
5, high-definition camera: refers to the ability to shoot high-quality, high-definition video digital camera, picture quality can reach 720 lines (progressive scanning), resolution 1280&TImes; 720; or reach 1080 lines (interlaced), resolution 1920 & TImes; 1080.
6. Low illumination: Illuminance, also called sensitivity, is the sensitivity of CCD to ambient light, or the darkest light required for normal imaging of CCD.
7. Wide dynamic technology: It can make the camera obtain bright images in the dark, and make the bright parts not affected by the color saturation, and can obtain the details in the dark.
8. Security: Support for username and password authentication, support for 802.1x access authentication and digital certificates, and support for stream encryption to become an essential feature of smart cameras.
9, intelligent front-end analysis: to a certain extent can reduce the back-end storage pressure. Intelligent video analysis detection and alarm at the front end, including but not limited to: squall line monitoring, perimeter intrusion monitoring, legacy monitoring, item removal and sputum monitoring.
Intelligent operation and maintenance: make the video surveillance system easier to use
The emergence of intelligent operation and maintenance makes the users of video surveillance systems do not need to have strong professional knowledge and IT skills.
1. Automatic discovery of network cameras: Using adaptive rapid deployment technology to achieve automatic registration of front-end network cameras, plug and play, effectively reducing installation and deployment costs.
2. Automatic inspection of equipment: The intelligent network camera adopts the automatic inspection and error detection design method to perform round-trip inspection on the operation of the equipment system (temperature abnormality, SD card reading and writing abnormality, etc.) in real time, improve maintenance efficiency and reduce equipment maintenance cost. .
3, the client automatically upgrades: video surveillance platform products through the client automatic upgrade technology can effectively solve the problem of a large number of user client synchronization upgrade.
4, intelligent video quality diagnosis: the use of video quality diagnostics, users can effectively detect image anomalies caused by lenses, shields and human factors. In addition, it also needs to support the functions of brightness anomaly detection, snowflake interference detection, video color cast detection, stripe interference detection, and signal loss detection, and timely discover that the video resources cannot be used normally and form a warning to facilitate maintenance of the entire network equipment.
5. Video service QoS: The video surveillance platform can ensure the availability and availability of video in the case of network degradation due to bandwidth adaptation and forward error correction.
Product Description
SPD Surge Protective Device,Lightning Surge Protector
Surge Protection Device (SPD)
It is a device used to limiting instant surge voltage and discharge surge current, it at least including a non-linear component.
Surge protective Device Model Selection
With the impact of international information flow, the rapid development of microelectronic science and technology, communication, computer and automatic control technology, make the building start to go for high quality, high functional area, formed a new building style-intelligent building. As inside the intelligent building there are lot of information system, <<Building lightning protection design norm>> GB50057-94(2002 vision)(hereafter brief as <<lightning protection norm>>) put forward the relative requirement to install the surge protective device, to ensure the information system safely and stable running.
SPD essentially is a equipotential connection material, its model selection is according to the different lightning protection area, different lightning electromagnetic pulse critical and different equipotential connection position, decide which kind of SPD used in the area, to achieve the equipotential connection with the common earth electrode. Our statement will based on SPD's maximum discharge current Imax, continuous operating voltage Uc, protection voltage Up, alarm mode etc.
As per << Lightning Protection Norm>> item 6.4.4 stipulation "SPD must can withstand the expected lightning current flow and should confirm to the additional two requirements: the maximum clamp voltage during surge across, capable to extinguish the power frequency follow-on current after lightning current across." That is the value of SPD's max. clamp voltage add its induction voltage of two ends should be same with the system's basic insulation level and the equipment allowed max. surge voltage.
SPD for Power Supply System Series Selection Guide
The installation of SPD at each lightning protection zone, according to the standard of low voltage electrical appearance, make classification of electrical equipment in accordance with the over voltage category, its insulation withstand impulse voltage level can determine the selection of SPD. According to the standard of low voltage electrical appearance, make classification of electrical equipment in accordance with the over voltage category as signal level, loading level, distribution and control level, power supply level. Its insulation withstand impulse voltage level are:1500V,2500V,4000V,6000V. As per to the protected equipment installation position different and the different lightning current of different lightning protection zone, to determine the installation position of SPD for power supply and the break-over capacity.
The installation distance between each level SPD should not more than 10m, the distance between SPD and protected equipment should as short as possible, not more than 10m. If due to limitation of installation position, can't guarantee the installation distance, then need to install decoupling component between each level SPD, make the after class SPD can be protected by the prior class SPD. In the low voltage power supply system, connecting an inductor can achieve the decoupling purpose.
SPD for power supply system specification selection principle
Max. continuous operating voltage: bigger than protected equipment, the system's max. continuous operating voltage.
TT System: Uc≥1.55Uo (Uo is low voltage system to null line voltage)
TN System: Uc≥1.15Uo
IT System: Uc≥1.15Uo(Uo is low voltage system to line voltage)
Voltage Protection Level: less than the insulation withstand impulse voltage of protected equipment
Rated discharge current: determined as per to the lightning situation of the position installed and lightning protection zone.
SP1 Series
Normal Working Conditions
-Altitude not exceed 2000m
-Ambient air temperature:
Normal range: -5ºC~+40ºC
Extend range: -40ºC~+80ºC
-Relative Humidity: 30% - 90% under indoor temperature condition
- At the place without obviously shaking and shock vibration
- Non-explosion danger medium, non-corrosion gas and dust ( including conductive dust)
Classification
-As per Nominal Discharge Current:
5,10,20,30,40,60KA(8/20µs)
- As per Maximum continuous operating voltage:
275V,320V,385V,420V,440V,460V
- As per to poles
1P,1P+N,2P,3P,3P+N,4P
- As per auxiliary functions:
a. With remote signal output ( remote alarm function)
b. Without remote signal output
Selection Principle
- The continuous applied voltage on the two terminals of SPD should not more than the maximum continuous operating voltage Uc value;
- The voltage protection level Up of SPD should less than the maximum impulse withstand voltage of the protected equipment;
- As per to the different earthing system and protection mode to select the specification accordingly;
Product Features
1, built-in over-current overheating, temperature control circuit technology.
2, the module design, easy installation, online replacement.
3, low leakage current, fast response time, low residual voltage.
4, alarm indication device, green (normal) v red (fault).
| Model/Technical Parameters | WR-B60 | WR-B80 | WR-B100 | WR-B120 | WR-B150 |
| Rated Operating Voltage Un (V ~) | 220V 380V | 220V 380V | 220V 380V | 220V 380V | 220V 380V |
| Maximum Continuous Operating Voltage Uc (V ~) kV | 385V 420V | 385V 420V | 385V 420V | 385V 420V | 385V 420V |
| Voltage Protection Level Up (V ~) kV | ≤1.8≤2.2 | ≤2.4≤2.5 | ≤2.5≤3.2 | ≤3.4≤3.7 | ≤4.0≤4.5 |
|
Maximum Discharge Current Imax(8/μ20μs)kA |
60 | 80 | 100 | 120 | 150 |
|
Nominal Discharge Current In(8/μ20μs)kA |
30 | 40 | 60 | 80 | 100 |
| Response Time | <25 | <100 | |||
| L/N(mm²)The Cross Section Of L/N Line | 16,25 | 16,25 | 16,25 | 16,25 | 25,35 |
| PE (mm²)The Cross Section Of PE Line | 16,25 | 25,35 | 25,35 | 25,35 | 35 |
| Fuse or Switch (A) | 63A | 63A | 63A,100A | 63A,100A | 63A,125A |
| The Line Section of Communication and Alarm (mm²) | ≥ 1.5 | ||||
|
Operating Environment-C |
(-40ºC~-+85ºC) | ||||
| Relative humidity 25 ºC | ≤95% | ||||
| installation | Standard Rail35mm | ||||
| Material of Outer Covering | Fiber Glass Reinforced Plastic | ||||
Surge Protector SPD,Surge Protection Device SPD,SPD
Wenzhou Korlen Electric Appliances Co., Ltd. , https://www.zjmoldedcasecircuitbreaker.com