JPH0435632U

JPH0435632U -

Info

Publication number: JPH0435632U
Application number: JP7716290U
Authority: JP
Priority date: 1990-07-20
Filing date: 1990-07-20
Publication date: 1992-03-25

Description

[Brief explanation of the drawing]

第１図は、本考案の一実施例を示す回路図、第
２図は、従来の技術の一例を示す回路図である。ＧＰ……ガス入り避雷管、ＰＴＣ１，ＰＴＣ２
……正特性サーミスタ、ＳＣＲ……サイリスタ、
Ｒ１，Ｒ２……電流制限抵抗、ＮＴＣ……負特性
サーミスタ、ＬＥＤ……発光ダイオード。 FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing an example of a conventional technique. GP...Gas-filled detonator, PTC1, PTC2
... Positive characteristic thermistor, SCR ... Thyristor,
R1, R2...Current limiting resistor, NTC...Negative characteristic thermistor, LED...Light emitting diode.

Claims

[Claims for Utility Model Registration] (1) Consisting of an overvoltage protection element provided between a communication line and the ground, and an overcurrent protection element provided in series with the communication line, the communication line is protected against lightning surge voltage. In a communication protector that protects from abnormal voltage caused by abnormal voltage or abnormal current caused by power line interference, when the overvoltage protection element or the overcurrent protection element generates heat due to abnormal voltage or abnormal current, a fault detection display that detects this heat generation and maintains the display. A communication protector, characterized in that a holding means is provided at a position that detects heat generation of the overvoltage protection element or the overcurrent protection element. (2) A communication line consisting of an overvoltage protection element provided between the first and second communication lines and the ground, and an overcurrent protection element provided in series with each of the first and second communication lines. In a communication protector that protects a device from abnormal voltage caused by lightning surge voltage or abnormal current caused by power line contact, one end is connected to the first communication line, and the overvoltage protection device or the When the overcurrent protection element generates heat, a detection section detects the heat generation and sends out a detection signal; a display section displays the detection signal and sends it to a second communication line; and conduction is established by the detection by the detection section. and a switch section that supplies current from the first communication line to the display section to maintain the display on the display section. (3) A communication line consisting of an overvoltage protection element provided between the first and second communication lines and the ground, and an overcurrent protection element provided in series with each of the first and second communication lines. A communication protector that protects the overvoltage protection device from abnormal voltage caused by lightning surge voltage or abnormal current caused by power line contact, one end of which is connected to the first communication line, and which protects the overvoltage protection element or When the overcurrent protection element generates heat, a negative characteristic thermistor detects this heat generation and reduces the resistance value. When the resistance value of the negative characteristic thermistor becomes small, a current flows from the first communication line through the negative characteristic thermistor. a first resistor that generates an electromotive force due to current; a light emitting diode that displays light using the current from the first resistor and sends it out to the second communication line; one end is connected to the first communication line; A communication device comprising: a second resistor that limits current; and a thyristor that, when made conductive by the electromotive force, supplies current from the second resistor to the display section to maintain the display on the display section. safety device.