Generator outlet PT disconnection early warning device and early warning method

A technology of early warning devices and generators, which is applied in the direction of motor generator testing, measuring devices, and measuring electricity. It can solve the problems that the initial failure of the voltage circuit cannot be early warned, and achieve high reliability, prevent false alarms, and simple operation. Effect

Pending Publication Date: 2020-07-03
JIUQUAN IRON & STEEL GRP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a PT disconnection early warning device at the generator outlet to solve the problem that the initial failure of the voltage circuit cannot be early warned

Method used

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  • Generator outlet PT disconnection early warning device and early warning method
  • Generator outlet PT disconnection early warning device and early warning method
  • Generator outlet PT disconnection early warning device and early warning method

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] Such as figure 1 , figure 2 As shown, a generator outlet PT disconnection warning device includes a voltage transmitter 5 and an analog input module 6. There are three voltage transmitters 5 connected to three secondary small wires of the voltage transformer 1 On the bus 4, the analog input module 6 includes a voltage sampling module 7, a differential pressure module 8, an absolute value module 9, a comparison module 10, a three-out module 11, a delay module 12 and an alarm module 13 connected in sequence, and the voltage sampling module 7 is connected with voltage transmitter 5 .

[0022] It also includes a display module 14 , and the voltage sampling module 7 , differential pressure module 8 and alarm module 13 are all connected to the display module 14 .

[0023] Analog quantity input module 6 adopts DCS.

[0024] The voltage transformer 1 is connected...

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Abstract

The invention discloses a generator outlet PT disconnection early warning device and early warning method, belongs to the technical field of thermal power plant electric power facility protection monitoring, and solves a problem that early warning cannot be carried out in advance for initial faults of a voltage loop. The device comprises voltage transmitters and an analog quantity input module, wherein the three voltage transmitters are respectively connected with three secondary small buses of a voltage transformer, the analog quantity input module comprises a voltage sampling module, a differential pressure module, an absolute value module, a comparison module, a one-out-of-three module, a time delay module and an alarm module which are connected in sequence, and the voltage sampling module is connected with the voltage transmitters. The method comprises steps of taking a voltage value, calculating a voltage difference, taking an absolute value, comparing, delaying judgment and giving an alarm. The device is advantaged in that logic calculation is carried out through the analog quantity input module, the early warning information is obtained, an alarm signal is sent out, early warning is sent out when an initial fault occurs in a voltage loop, on-duty and maintenance personnel are reminded to check a PT primary loop and a PT secondary loop, and accident expansion is prevented.

Description

technical field [0001] The invention belongs to the technical field of protection and monitoring of power facilities in thermal power plants, and in particular relates to a PT disconnection early warning device and an early warning method at a generator outlet. Background technique [0002] The generator outlet voltage transformer (PT) changes the primary voltage of the generator outlet from 20KV to the secondary 100V, which is used for generator-transformer protection, excitation regulator, electric energy meter, power transmitter and other equipment. Faults such as the fuse of the primary fuse of the voltage transformer, and poor contact of the primary and secondary circuits will cause inaccurate voltage collection, resulting in misoperation or refusal of protection, and inaccurate energy measurement. At present, the generator outlet voltage circuit is mainly monitored by the PT disconnection alarm function of the generator-transformer protection device. The PT disconnecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/54G01R31/74G01R31/34G01R35/02G01R19/10
CPCG01R19/10G01R31/343G01R35/02
Inventor 马中荣成玉峰
Owner JIUQUAN IRON & STEEL GRP
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