Tasks: ConceptBase modeling

$6.$Tasks $($ the answer should be written clearly with the steps you followed$)$

Here is the description of the three main tasks, that you are expected to carry

out as part of the lab exercise $.$ Task $1$ is about defning a cyber$-$physical

system model of a power substation. Task $2$ adds a control center, the software

on the IT$/$OT components and the data streams. Finally, Task $3$ is about

analyzing the model by queries.

$6\mathrm{.}1$ Task $1$: Substation model including OT components

A municipal power company has one substation where it received electric power

from an external operator ontology concept "ExternalGrid"$).$ The power arrives

via a powerline to a circuit breaker and from there to a busbar. Two step down

transformers are connected via circuit breakers to this busbar. On the other side,

the two transformers are connected via circuit breakers to their own busbars from

where distribution power lines go to small transformer stations $($serving neigh$-$

borhood households$).$ The households are not directly represented in the network

model, but their power consumption is represented by a "load" such as $"$ld$1".$

The load is measured in Kilowatts. In the substation, an RTU controls the cir$-$

cuit breakers and the transformers. The RTU can directly link to the circuit

breakers but the connections to the transformers should use actuators and$/$or

sensors $($e$.$g$.$ voltage meters$).$ The RTU is connected to a single MTU in the

substation. The two OT components, a $\_$rewall, a router and a switch should

be part of the substation network $($ontology concept "Network$).$ The power grid

components are part of the substation $($ontology concept "SubStation"$).$ There

should be at least one powerline chains from the two lower bus bars to trans$-$

former stations. Each transformer station should have one transformer. There

should be at least two transformer stations. In total there should be around $30-40$

components in your cyber$-$physical system model$3.$

Figure $8$ shows a partial diagram of the substation with two transformer

stations $(=$ small substations$)$ connected in a chain via powerlines. The blue

lines are power connections, the grey lines are data connections. Figure $8$ shall

be regarded as a rough indication, not as a guideline for your solution! For ex$-$

ample, it makes sense to have circuit breakers on the transformer stations like

in the larger substation to be able to isolate the transformer station. Further,

a realistic transformer station should have its own network featuring a router,

a switch, and possibly also a $\_$rewall as sub$-$components. The networks of the

transformer stations could be connected in a chain to the network of the sub$-$

station. Note that there shall also be a network or two networks for the control

center.

The following sub$-$tasks are included in Task $1$:

Subtask $1\mathrm{.}1$: Extend the ontology by defining a concept for voltage meter as

subclasses of $$Sensor$.$

Subtask $1\mathrm{.}2$: Extend ontology by a new relation $$signalconnection$$ between

the concept $$OTServer$$ and $$PhysicalComponent$.$ This can be used to con$-$

nect for example RTUs to sensors and actuators.

Subtask $1\mathrm{.}3$: Create the substation network model as instance of the extended

ontology. Model the components of your network model in the module M cb$.$

Your solution should consist of the following parts:

Part $1.$A: The sources $(=$Telos definitions$)$ of the solution to subtasks $1\mathrm{.}1$ and

$1\mathrm{.}2.$

Part $1.$B: A discussion on the rationale for your solution to subtasks $1\mathrm{.}2$ and

$1\mathrm{.}2.$ Are there more essential component types missing in the ontology. Your

solution add $$signalconnection$$ but there may be more relations$/$properties

missing to express meaningful cyber$-$physical models.

Part $1.$C: The complete sources of the substation model including the power$-$

lines to the neighborhood transformer stations.

Part $1.$D: A discussion on the advantages and disadvantages of your overall

solution to task $1.$ Are there components that are not controlled by sensors or

actuators? Are there single points of failure?

Part $1.$E: A visualization of your solution using CBGraph or a drawing tool of

your choic