Anomaly detection in Time Series Data - Help Required
Welcome to DS forum. There are many methods available for anomaly detection of uni-variate, low dimension and high dimension data sets. 

Supervised algorithms can be used if the past anomalies are recorded with flag variables and there is significant examples of flagged anomalies.

In unsupervised algorithms the key aspect of anomaly is which subset of the larger data set is considered when looking for anomolies i.e., global vs local and point vs contextual



Here are some useful links to get you started, anomaly detection in machine generated data and introductory overview of time-series based anomaly detection algorithms.

Hope this helps.