Relay test set using computer controlled voltage supply to stimulate both voltage and current transformers
First Claim
1. A test set for driving inputs of a unit under test (UUT), wherein the UUT comprises a low voltage protective relay, comprising a voltage and current source that includes a single voltage amplifier to drive both voltage and current inputs of the protective relay;
- a microcomputer for monitoring both current and voltage being injected into the protective relay; and
a relay matrix operatively coupled to the microcomputer and the protective relay, wherein the microcomputer routes the voltage or current to the appropriate inputs of the protective relay by direct control of the relay matrix.
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Accused Products
Abstract
A relay test set of reduced size and weight includes a small, highly efficient voltage and current source. The test set incorporates a Class D switching amplifier design that greatly reduces the size of the power source needed to inject the correct voltage and current into the secondary inputs of a protective relay. To further reduce the size, weight and cost of the relay test set, a single voltage amplifier is used to drive both voltage and current secondary inputs of a protective relay. In so doing, this test set then becomes both a voltage transformer and current transformer simulator utilizing a single voltage power source at reduced size, weight and cost. To make the power source variable while maintaining accuracy, a microcomputer module is used to monitor both current and voltage being injected into the protective relay. This microcomputer may also automatically run the required relay tests and route the voltage or current to the appropriate inputs of the protective relay by direct control of a relay matrix.
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Citations
6 Claims
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1. A test set for driving inputs of a unit under test (UUT), wherein the UUT comprises a low voltage protective relay, comprising a voltage and current source that includes a single voltage amplifier to drive both voltage and current inputs of the protective relay;
- a microcomputer for monitoring both current and voltage being injected into the protective relay; and
a relay matrix operatively coupled to the microcomputer and the protective relay, wherein the microcomputer routes the voltage or current to the appropriate inputs of the protective relay by direct control of the relay matrix. - View Dependent Claims (2, 3, 4, 5, 6)
- a microcomputer for monitoring both current and voltage being injected into the protective relay; and
Specification