AWS has products that work with IoT applications, so what is the security meaning of PaaS database applications? In the end, what is the security of IoT data security? Is it an IaaS or a PaaS database? The core security implications of using a cloud-based database are common across infrastructure as a service and platform as a service; two important differences are the security sharing responsibilities in the PaaS model and the co-tenancy issues in the PaaS database. Any time you transfer an app to the cloud, you need to share security responsibilities with the same cloud provider. For example, if you manage your own database on an AWS EC2 instance, you need to rely on AWS to provide physical security and enforce access control. As a customer of IaaS, you need to be responsible for ensuring the security of the operating system and the specific user authorization. When working with PaaS, more responsibility was transferred to the PaaS provider. PaaS providers can assume management database security controls. Specifically, vendors need to secure servers, database applications, files, and other storage mechanisms. This is to focus more on application performance and analyze the benefits that physical network application developers can take advantage of, rather than focusing on database management. When using a PaaS database, you may want to consider how your data is stored relative to other PaaS user data. For example, if you use a key-value database, the data may be stored in a single logical database. In this scenario, the PaaS application must include a specific client identifier with a key-value determination to avoid conflicts with other users' data. If a relational database is used to store application-specific data, such as sensor reads from a car, then the PaaS provider may use a single database and partition based on the customer ID. The key question for PaaS customers is "relative to other customers' data, how their data is stored, and other people's access to customer data. What are the potential vulnerabilities that this mechanism may cause?" Multi-tenancy is also a problem with applications running on virtual servers. Can a single instance of an application accept data from multiple customers? For example, a message queue, like Kafka or Kenessis, can be used to accept data from IoT devices; is it acceptable for you to share messaging services? Or do you want to have your own message queue, a separate input stream? PaaS providers may provide specific database services that are accurate for IoT workloads. It's important to understand multi-tenancy, especially how data is loaded, how applications are handled, and how data storage is implemented.
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).
Maximum Discharge
Current Imax(8/μ20μs)kA
Nominal Discharge
Current In(8/μ20μs)kA
Operating
Environment-C
Surge Protector SPD,Surge Protection Device SPD,SPD Wenzhou Korlen Electric Appliances Co., Ltd. , https://www.zjaccontactor.com
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;
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
60
80
100
120
150
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
(-40ºC~-+85ºC)
Relative humidity 25 ºC
≤95%
installation
Standard Rail35mm
Material of Outer Covering
Fiber Glass Reinforced Plastic