Siemens ISGS SG8158-00 User Manual download pdf (Page 37)

Control & Communications

Siemens Energy & Automation, Inc. 31

6 Control & Communications

6.1 Matrixing Events to Outputs

One of the powerful functions of the ISGS relay is its ability to

send control outputs based on inputs from the real world.

This process of assigning various outputs to various inputs is

called matrixing. Utilities in Europe call this marshalling. Since

most customers in America are not familiar with this term and

because the word configuring is used in too many other con-

texts, we use the more specific word matrixing. The inputs

that can be used to control outputs can be binary (on/off)

inputs and communication events. The binary inputs deter-

mine if a certain type of protection is being violated and can

close a trip contact or binary output based on the intelligence

of the relay. The outputs can be trip contacts or binary out-

puts. Figure 6.1 shows in general form how the outputs can

be controlled by various inputs. The outputs can also be

controlled by a command from an external communication

device on the network; this input is called a Communication

Event. The ISGS relay offers four binary inputs (BI 1, BI 2,

BI 3, and BI 4), two binary outputs (BO 1, BO 2), and three

trip contacts (Trip 1, Trip 2, and Trip 3). Matrixing is used for

blocking and event-driven functions as well as for binary

input and setpoint functions.

A physical input is a hardware connection to the relay such

as binary input 1 (BI 1). A logical input is an input to a func-

tion internal to the relay such as the blocking input for under-

voltage (protective function, 27) (see Section 5.12). The

logical input can only be activated if it is matrixed to the

physical input. Connecting the physical input BI 1 to the logi-

cal input for function number 27 allows BI 1 to block PF27

when active. Up to 10 logical inputs can be matrixed to each

output contact.

A physical output is a trip contact or binary output (BO). A

logical output is the output of a function internal to the relay

such us Pickup, which is active when function 27 is in

pickup. Connecting a logical output to a physical output

allows function 27 to trip (actuate a contact). Up to 20 logical

outputs can be matrixed to each output contact.

Note: Matrixing includes defining which protective

functions actuate an output contact, and

which output contact they actuate. Matching

the output connections of the relay with the

wiring connections of the protective circuit,

including the connections to the circuit

breaker, is extremely important. If the matrix-

ing of the ISGS relay is changed, double-

check the wiring of the protective circuit, and

always test that the operation of a protective

function results in the circuit breaker tripping.

Without matrixing, an event will cause an entry in the Event

Log, but nothing will happen with the outputs and no control

activity will occur. With matrixing, an event can cause the

relay to trip a breaker (for example) as well as causing an

entry in the Event Log.

Figure 6.1 Matrixing Inputs to Outputs

Events

Outputs

Output Contact

Trip Contact

Binary Output

Event 1

Event 2

Event 3

Comm

Event

50HS

50N

Output 1

Output 2

Output 3

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