Metring Plan

Ontario Transmission Code requires a Metering Service Provider (MSP) to be hired by load or generator customers for metering services. MSPs are third parties certified for the design, installation, commissioning and operation of metering equipment in HV stations.

AS a first step, MSP prepares a metering single line diagram (SLD) and sends to IESO for approval. MSP also prepares a metering plan to be submitted to IESO for approval. However, MSP does not submit the metering plan directly to the IESO as it needs to come from the Metered Market Participant (MMP). The plan needs to be updated with all the information including the MECs.

Once the SLD is approved IESO will then request package 2 to be submitted which will include the EITRP (Emergency IT Restoration Plan) and the MEC documents.  The secondary cable distances between IT's and the metering cabinet is required in order to complete the MEC calculations.

Partial Discharge Test

In terms of interpretation of partial discharge measurements, the results shall be considered acceptable and no further partial discharge tests required under the following conditions:

a) The magnitude of the partial discharge level does not exceed 500 pC during the 1 h test period.

b) The increase in partial discharge levels during the 1 h period does not exceed 150 pC.

c) The partial discharge levels during the 1 h period do not exhibit any steadily rising trend, and no sudden sustained increase in the levels occurs during the last 20 min of the test.

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Reference:

IEEE C57.12.90: Test Code for Liquid-Immersed Distribution, Power, and Regulating

The Network Management System (NMS)

The Network Management System (NMS)

The Network Management System (NMS) is the supervisory control and data acquisition tool. It performs the following functions:

1- SCADA, 

2- The Real Time Network Analysis

3- The Study Network Analysis.

4- Training Simulation.

It provides the real time voltage and loading on the transmission system as well as monitoring and control of the status of the switches and breakers connecting the equipment to form the integrated network for the purpose of safe and reliable operation of the transmission system.

The NMS also provides predicative assessment tools which help in providing awareness of the situation of different elements of the electrical transmission grid to the operator. 

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Reference: Hydro One Operations Capital