Theory : Keltner channel is calculated as SMA (Simple Moving Average) + ATR(Average True Range)*multiplier. This version is using the intra-day ATR instead (published, with additional explanation here : Intra-day ATR). This version is also extending the "basic" ...
from https://tradingrobots.net/intra-day-keltner-channel-extended-indicator-for-metatrader-5/