Digital protection relay, digital protection relay test device, and digital protection relay test method

a digital protection relay and test device technology, applied in emergency protection circuit arrangements, emergency protection arrangements for limiting excess voltage/current, etc., can solve the problems of small power outage of the main circuit, inability to protect the main circuit, and limited time for conducting digital protection relay test. , to achieve the effect of safe and easy operation tes

Inactive Publication Date: 2015-07-16
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patented technology is that it provides a way for digital protective relays to operate safely and easily even before they are turned on again after being tested.

Problems solved by technology

The technical problem addressed by this patent is how to efficiently perform a digital protective relay testing process while ensuring that the main circuit can still operate properly even after being powered down due to any issues affecting its operation.

Method used

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  • Digital protection relay, digital protection relay test device, and digital protection relay test method
  • Digital protection relay, digital protection relay test device, and digital protection relay test method
  • Digital protection relay, digital protection relay test device, and digital protection relay test method

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Embodiment Construction

[0015]Hereinafter, an embodiment will be described with reference to the drawings.

[0016]The present embodiment enables an operational test of a digital protection relay while continuing protection of a main circuit without powering off the main circuit.

[0017]FIG. 1 is a block diagram showing an exemplary configuration of a digital protection relay according the present embodiment.

[0018]As shown in FIG. 1, the digital protection relay of the present embodiment comprises a main circuit transformer 1, an auxiliary transformer 2, an analog detection circuit 3, an A / D conversion circuit 4, a central processing unit (CPU) 5, a memory 6, a display circuit 7, a switch circuit 8, a breaker trip output contact 9, a communication circuit 10, and a test contact.

[0019]The main circuit transformer 1 is connected to the main circuit. The auxiliary transformer 2 decreases a voltage of an electrical signal from the main circuit transformer 1 to a predetermined electronic circuit level.

[0020]Between t

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Abstract

According to one embodiment, a digital protection relay includes an auxiliary transformer (2) which decreases a voltage of an electrical signal from a main circuit transformer (1) to a predetermined voltage; a detection resistance circuit (20) including a Π-type or T-type circuit including an input connected to an output of the auxiliary transformer (2); an analog detection circuit (3) which is connected to an output of the detection resistance circuit (20) and detects a quantity of electricity of an electrical signal from the auxiliary transformer (2); an A/D conversion circuit (4) connected to the analog detection circuit (3); a central processing device 5 which is connected to the A/D conversion circuit (5) and performs a protection operation; and a trip output contact (9) which is closed by processing of the central processing device (5) and operates an external breaker (21). In the digital protection relay, an input contact terminal 11 for inputting a test signal with a constant voltage from an external test device (13) to the analog detection circuit (3) as a signal corresponding to an output of the auxiliary transformer (2) is provided between the detection resistance circuit (20) and the analog detection circuit (3).

Description

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Claims

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Application Information

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Owner KK TOSHIBA
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