loading

Is specialized in designing, manufacturing for power transformers ,furnace transformers and reactor.

Treatment and Cause Analysis of Secondary Open Circuit of Current Transformer

Treatment after secondary open circuit:(1) Try to short-circuit the current transformer for the second time on the nearest test terminal, and then check and deal with the open circuit point. During the short-circuit, the special short-circuit wiring for short-circuit shall be used. The short-circuit shall be proper and reliable. It is forbidden to use fuse or general conductor winding, and it shall be carried out according to the drawing.(2) Pay attention to the phenomenon of short-circuit. If there is spark during short-circuit, the short-circuit is effective. The fault point is in the circuit below the short-circuit contact, which can be further found. If there is no spark during short-circuit, the short-circuit may be invalid. The fault point may be in the circuit before the short contact. The short contact can be changed forward point by point to narrow the range.

Treatment and Cause Analysis of Secondary Open Circuit of Current Transformer 1

(3) When shorting the secondary circuit, the staff must adhere to the operation monitoring system, one person operates and one person monitors. Keep an appropriate safe distance from live equipment. Operators must wear insulating boots, insulating gloves and tools with insulating handles. It is forbidden to carry out any work on the circuit between the current transformer and the short-circuit point.

(4) Within the fault range, check the terminals and components prone to failure, and check the parts of the circuit that have been touched during operation. For the faults detected, those that can be handled by themselves can be handled immediately, and then the exited protection can be put into operation. If the open circuit point is on the wiring terminal of the transformer body, the power shall be cut off for treatment. In case of failure that cannot be handled or found out by yourself, report to the superior and send someone to check and deal with it. At this time, the current transformer shall be short circuited for the second time, or the load shall be transferred and the power shall be cut off.

(5) If the secondary open circuit of current transformer is found, it is necessary to distinguish which group of current circuit the fault belongs to, the phase of the open circuit and whether it has an impact on the protection, report to the dispatcher and remove the possible misoperation protection.Cause of secondary open circuit:(1) When the secondary line terminal connector is not crimped tightly and the current in the circuit is large, it will be heated, burned out or oxidized, resulting in an open circuit.

(2) The outdoor terminal box and junction box are damp, and the terminal bolts and gaskets are excessively rusted, resulting in an open circuit.(3) Due to the defects in structure and quality, the test wiring terminal in AC current circuit has poor contact between screw and copper plate screw hole during operation, resulting in open circuit.(4) For the test terminal pressing plate in the current circuit, because the glue wood is too long, the metal sheet of the rotating terminal is not pressed on the metal sheet of the pressing plate, but is wrongly pressed on the glue Wood sleeve, resulting in an open circuit.

Treatment and Cause Analysis of Secondary Open Circuit of Current Transformer 2

(5) Errors made by the maintenance and test personnel in their work, such as forgetting to connect the internal connector of the relay, could not be found during acceptance.

GET IN TOUCH WITH Us
recommended articles
Case News
The working principle of current transformer is similar to that of transformer. Its basic working principle is to work according to the electric magnetic electric co...
Voltage transformer and current transformer have the same point. They all use the working principle of electricity magnetism electricity. As shown in Figure 1 belo...
The secondary parameters of current transformer include transformation ratio and accuracy level.For the current transformer for protection, the accuracy level shall ...
Residual current transformer:Residual current transformer is the detection element of leakage protector. Its main function is to detect the residual current (groundi...
Precautions for use of current transformerPay attention to the following points when using current transformer(1) The configuration of current transformer shall meet...
How to install current transformer1. The construction shall be carried out according to the drawing, the wiring shall be correct, the number marks at both ends of th...
For a long time, as a standard device in instruments and equipment, current transformer has been used to measure precision current. Even in harsh environment and hig...
The current sampling unit is a sampling circuit that provides the current sampling signal to the single chip microcomputer when the induction cooker works. The singl...
How to select the transformation ratio and accuracy of main technical parameters of current transformerCurrent transformer is a special transformer. Its function is ...
Causes and precautions of secondary electrification of current transformerWhen the current transformer (hereinafter referred to as CT) is working, the secondary circ...
no data
As a professional power transformer manufacturer with 20 years of experiences, NINGBO VILLE ENTERPRISE is a combination of Transformer R&D center, production, sales and after sales service, possesses of strong technical strength and excellent manufacturing equipments, as well as modern Office facilities.
no data
PLEASE CONTACT US.
Contact person:  GREEN HSU
Contact number:  +86-13906684456 / +86-13867838839
WhatsApp:008613867838839 / 008613906684456

Add: Fl 6, No.C12 Building, Lane 299 Guanghua Rd, Ningbo R&D Park,Ningbo Hi-Tech Zone,China, 315040

Copyright © 2023 NINGBO VILLE ENTERPRISE CO.,LTD. - https://www.villeelectric.com/ | Sitemap
detect