US 6,696,925 B1 · Electrical revenue meter and instrument transformers mobile station

Abstract

A mobile metering system (MMS) comprises a trailer-mounted fully-enclosed three-phase set of current transformers (CTs) and power transformers (PTs), and a metering interface. The instrument transformers reduce the source voltage to a meterable level. The MMS enclosure enables a single utility work crew to connect source-side power bushings mounted on the roof of the MMS to conductors from a compatible source, such as the secondary side of a substation transformer, without the need for a bucket truck. Load-side power bushings are also mounted on the roof of the MMS for connection to the power distribution network. An electromagnetic locking system prevents access to the interior of the enclosure while the MMS is energized. A rigid ground grid mounted on the roof of the MMS grounds the insulators, a ground loop grounds the CTs and PTs, and both the ground grid and the ground loop are connected to the earth ground.

Claims23

Dependent claims

A portable monitoring apparatus for being transported to a location in a electrical power transmission or distribution network and for use in monitoring signals that are carried over a line in the power distribution network, comprising:

a platform for being transported to the location in the electrical power transmission or distribution network;
an instrument transformer mounted to the platform and having a primary side and a secondary side, with the primary side having a greater number of windings than the secondary side and having an input terminal and an output terminal;
a source side bushing, mounted on and insulated from the platform, for connecting a source side of the line to the input terminal of the primary side of the instrument transformer;
and
a load side bushing, mounted on and insulated from the platform, for connecting a load side of the line to the output terminal of the primary side of the instrument transformer;
the secondary side of the instrument transformer reducing a magnitude of the parameter of the signals on the line and outputting monitoring signals;
the secondary side of the instrument transformer providing the monitoring signals to a monitoring apparatus;
wherein the monitoring apparatus is for monitoring the parameter of the signals that are carried on the line.

5 more elements

Dependencies are inferred from the claim text.

Electrical revenue meter and instrument transformers mobile station

Life of this patent

Electrical revenue meter and instrument transformers mobile station

Life of this patent

Abstract

Claims23