GE F650 Instruction Manual page 163

5.2 PRODUCT SETUP
Demand module settings are as follows:
Table 5–17: DEMAND SETTINGS
SETPOINT > PRODUCT SETUP > DEMAND
Setting Description
Function permission
Demand method for current values CRNT Demand Method
Demand method for Power values POWER Demand Method
Demand interval
Trigger Enabled
Snapshot Event generation
Function permission (Function):
Demand Method for Current values (CRNT Demand Method): Selection of the demand calculation method for current
Demand Method for Power values (POWER Demand Method): Selection of the demand calculation method for power
Demand Interval:
5
Demand Trigger:
Snapshot Events:
5.2.6.2 DEMAND CALCULATION METHODS
a) CALCULATION METHOD 1: THERMAL EXPONENTIAL
This method simulates the action of an analog peak recording thermal demand meter. The relay measures the magnitude
for each phase (or three-phase, depending on the case) every second, and it assumes that the magnitude remains the
same until the next update. It calculates the equivalent thermal demand using the following equation:
Where:
D Input signal (constant).
d(t) Demand value after applying the input value during time t (in minutes)
K 2.3 / thermal 90% response time
5-16
Name Default Value
Demand Function DISABLED
THERMAL EXPONENTIAL
THERMAL EXPONENTIAL
Demand Interval 5 Minutes
Trigger Enabled DISABLED
Snapshot Events ENABLED
This setting enables the demand function.
values. Available methods are Thermal Exponential, Block interval, and Rolling
Demand.
values. Available methods are Thermal Exponential, Block interval, and Rolling
Demand.
Integration interval. Available intervals are 5, 10, 15, 20, 30, 60 minutes.
Measurement integration is performed in the period adjusted in the Demand Interval
setting.
Operation mode selection for the Block Interval calculation method. This operation
mode depends on the "Trigger Enabled" setting. If trigger enabled is set as disabled,
measurement integration is made in the Demand Interval period. If trigger enabled is
enabled, measurement integration is made during the time interval between two
consecutive pulses of the input assigned as DEMAND TRIGGER INP,. This input is
set at Setpoint > Relay configuration > Protection Elements
This setting enables or disables the snapshot event generation for the demand
element.
=
d ) ( t D 1 (
F650 Digital Bay Controller
Step Range
N/A [DISABLED – ENABLED]
N/A [BLOCK INTERVAL -
ROLLING DEMAND -
THERMAL EXPONENTIAL]
N/A [BLOCK INTERVAL -
ROLLING DEMAND -
THERMAL EXPONENTIAL]
N/A [5 – 10 – 15 – 20– 30–60]
N/A [DISABLED – ENABLED]
N/A [DISABLED – ENABLED]
−
−
Kt
e )
5 SETTINGS
GEK-106310AB