Basler BE1-11m Instruction Manual Download

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16-3

BE1-11

Power (32) Protection

Figure 16-2. Forward and Reverse Pickup Values

Assuming polarity current and voltage connections as shown in Figure 16-1, forward power is defined as

flowing into the Area EPS and reverse power is defined as flowing into the Local EPS. For this

application, the 32 element should be set to trip for minimum underpower in the reverse direction (to the

Local EPS). Therefore, the settings would be Reverse, Under, and 1 watt. To increase sensitivity, mode

selection should be 3 of 3 which requires each phase power to fall below

⅓

of the three-phase power

setting or 0.33 watts. Assume that normal power absorbed by the load is 4 kW in the reverse or negative

direction on our scale. If load is suddenly lost at the industrial plant while the peak shaving generation is

running, power may flow towards the Area EPS depending on the load to generation ratio. What was a

negative 4 kW passes through 0 watts on its way to some positive power level. However, in doing so,

passes through the negative underpower trip threshold of Reverse, Under, 0.33 watts/phase, resulting in

a 32 trip and opening of the intertie circuit breaker. From negative 0.33 to positive infinity, the 32 element

remains in a picked up condition as shown in Figure 16-2. A trip time delay should be included to ensure

that the 32 element does not operate for a transient power condition.

Pickup and Trip

The Pickup output occurs first, followed by the Trip output.

Pickup

The Pickup output occurs when the calculated real power increases above or decreases below the

threshold established by the Pickup setting. In BESTlogic

Plus

, the Pickup output can be connected to

other logic elements to annunciate the condition, control other elements in logic, and start the fault

recorder (logic element FALTTRIG).
Assertion of the Pickup output initiates a definite timer that begins timing to a trip. The duration of the

timer is established by the Time Delay setting. A Time Delay setting of zero (0) makes the 32 element

instantaneous with no intentional time delay.
If the pickup condition subsides before the element delay expires, the timer and Pickup output are reset,

no corrective action is taken, and the element is rearmed for any other occurrences of over/under power.

Trip

The Trip output becomes true if a power pickup condition exists for the duration of the element Time

Delay. In BESTlogic

Plus

, the Trip output can be connected to other logic elements and to a physical relay

output to annunciate the condition and to initiate corrective action. If a target is enabled for the element,

the BE1-11

will record a target when the Trip output becomes true. See the

Fault Reporting

chapter for

more information about target reporting.

Element Blocking

Fuse Loss

The fuse loss (60FL) element of the BE1-11

can be used to block 32 protection when fuse loss or loss

of potential is detected in a three-phase system.
If the 60FL element trip logic is true and Block Power/Power Factor is enabled, all functions that use

Basler BE1-11m, Instruction Manual

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