High-voltage metering box closes and stores energy

When can a metering unit be connected to the network?

The metering unit cannot be connected to the network until these documents have been provided. Under the National Electricity Rules testing of instrument transformers forming part of a High Voltage (HV) metering installation shall be tested every 10 years.

Who is responsible for a metering unit?

Where a customer supplies a metering unit, they shall be responsible to provide and maintain this as part of their electrical installation. Test certificates for and details of the metering unit shall be provided to Ergon Energy prior to delivery and installation of the equipment on site.

What are HV/LV metering characteristics?

Figure 1 – Delivery station with HV metering and, where applicable, HV/LV substations High-voltage cubicles and their switchgear thus have voltage, current, frequency and short-circuit withstand capability rating characteristics which are defined by these standards and which indicate if they are suitable for use in a certain type of network.

What equipment does a high voltage substation have?

However, in general, high voltage substation has the following main equipment: A busbar structure is an assembly of bus conductors with associated connection joints and insulating supports. It can have bare or insulated conductors.

What is a customer supplied metering unit?

Accordingly, customer supplied equipment shall be designed to comply with the accuracy and testing requirements of Chapter 7 of the National Electricity Rules. Where a customer supplies a metering unit, they shall be responsible to provide and maintain this as part of their electrical installation.

How many mm2 cable does a metering unit use?

Wiring from the Metering Unit to the Meter Panel Wiring from both the VT and CT terminal box will run in conduit using 2.5 or 4 mm2 cable. Cable sizes are dependent on distance from the instrument transformer or metering unit terminal box to the meter panel and marshalling cubicle.