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Residual current transformer secondary coil disconnection detection circuit

A technology of disconnection detection and residual current, which is applied in the field of disconnection detection of the secondary coil of residual current transformer externally connected to the residual current action relay, and the field of residual current action relay, which can solve the problems of increasing system cost and complexity

Inactive Publication Date: 2014-06-11
SHANGHAI HUAJIAN ELECTRICAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Adds cost and complexity to the system

Method used

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  • Residual current transformer secondary coil disconnection detection circuit

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Embodiment Construction

[0008] The present invention will be further described below in conjunction with accompanying drawing:

[0009] See attached figure 1 , The schematic diagram of the residual current transformer secondary coil disconnection detection circuit has marked the model of each component, and the components purchased in the market can be connected according to the schematic diagram to realize the residual current transformer secondary coil disconnection detection function, which is further explained below The working principle of the circuit: When the main control unit detects that the residual current is 0, the P1.0 pin of the main control unit U1 drives the loading of the disconnection detection current module, and loads the disconnection detection current to the input module. If the external residual current mutual inductance If the secondary coil of the device is disconnected, the voltage provided by the input module to the operational amplifier module is determined, which is the d...

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Abstract

The invention discloses a residual current transformer secondary coil disconnection detection circuit. An input detection module is connected with an operational amplifier module; the operational amplifier module is connected with a main control unit module; the main control unit module is connected with a loading disconnection detection current module; and the loading disconnection detection current module is connected with an input module. Thus, whether residual current transformer secondary coil is disconnected can be detected only by applying micro current to the residual current transformer secondary coil with no need of applying detection current to the residual current transformer primary side.

Description

technical field [0001] The invention relates to the technical field of a residual current operated relay, in particular to the technical field of disconnection detection of a secondary coil of a residual current transformer externally connected to the residual current operated relay. Background technique [0002] Current transformers are important components in power systems. When the current transformer is disconnected, a high induced voltage will be generated, which will cause damage to equipment and people. Therefore, it is often necessary to detect the disconnection of the current transformer in time so that the relay protection equipment can take protective measures. For the detection of secondary coil disconnection of residual current transformers, an additional detection circuit is currently added to the primary circuit of residual current transformers. There is an induced current in the loop, and it is judged whether the secondary is disconnected by detecting wheth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 王晓辉戴顺辉施红雷
Owner SHANGHAI HUAJIAN ELECTRICAL EQUIP
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