1. A digital protection relay comprising:
an optical fiber cable, for a point sensor, configured to transmit an optical signal for sensing an arc;
a signal conversion unit configured to convert the optical signal into an electrical signal, and output the converted electrical signal;
an amplifying unit configured to selectively apply an amplification factor to the electrical signal on the basis of a control signal, and output the same; and
a microcomputer configured to output the control signal for determining the amplification factor according to a length of the optical fiber cable, and determine whether to drive the digital protection relay according to results obtained by comparing the amplified electrical signal with a predetermined reference value.
2. The digital protection relay of claim 1, wherein the amplifying unit includes a plurality of operational amplifiers and selectively drives the operational amplifiers to have an amplification factor proportional to a length of the optical fiber cable according to the control signal received from the microcomputer.
3. The digital protection relay of claim 1, wherein the microcomputer comprises:
an amplification factor determining unit configured to compare the amplification factor proportional to a length of the optical fiber cable with an amplification factor with respect to a predetermined reference length to determine the amplification factor; and
a comparing and determining unit configured to compare a magnitude of the electrical signal output from the amplifying unit with a predetermined reference value to determine whether an arc has occurred.
4. The digital protection relay of claim 3, further comprising:
an output unit configured to display value \u20181\u2019 when the magnitude of the electrical signal is equal to or greater than the reference value according to the comparison results from the comparing and determining unit, and display value \u20180\u2019 when the magnitude of the electrical signal is smaller than the reference value,
wherein when a value displayed on the output unit is 1, the microcomputer may determined that an arc has occurred, and output a trip signal.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A junction circuit for an auxiliary device module comprising:
a first base board having a terminal receiving hole;
a second base board having a terminal receiving hole;
a base board formed integrally with the first base board and the second base board;
a first electric connecting portion provided by inserting a terminal into the terminal receiving hole of the first base board;
a second electric connecting portion provided by inserting other terminal into the terminal receiving hole provided in the second base board; and
a printed wire formed on a flexible base for electrically connecting the terminal of the first electric connecting portion and the other terminal of the second electric connecting portion.
2. The junction circuit for an auxiliary device module according to claim 1, wherein a rear end of the terminal of the first electric connecting portion is connected to an end of the printed wire of the flexible base by soldering, wherein a rear end of the other terminal provided in the second electric connecting portion is connected to the other end of the printed wire of the flexible base by soldering.
3. The junction circuit for an auxiliary device module according to claim 1, wherein the printed wire of the flexible base bent at predetermined portion is connected with the first electric connecting portion and the second electric connecting portion.
4. The junction circuit for an auxiliary device module according to claim 2, wherein the printed wire of the flexible base bent at predetermined portion is connected with the first electric connecting portion and the second electric connecting portion.
5. The junction circuit for an auxiliary device module according to claim 1, 2, 3 or 4, further comprising:
a board mounting hole corresponding to a mounting portion of a device on which the junction circuit for an auxiliary device is mounted.
6. An auxiliary device module comprising:
a base board, having a terminal, on which an auxiliary device is mounted;
a junction circuit having a first electric connecting portion provided with a terminal, a second electric connecting portion provided with other terminal and a base board; and
a case provided with a connector housing corresponding to the first electric connecting portion of the junction circuit, wherein a connector is contained in the case by mounting the first electric connecting portion of the junction circuit on the connector housing of the case, wherein the terminal in the base board and the other terminal mounted in the second electric connecting portion of the junction circuit are connected by mounting the base board on the case.
7. The auxiliary device module according to claim 6, wherein a mating connector having a terminal is electrically connected with the connector, having the terminal, contained in the case.
8. The auxiliary device module according to claim 6, wherein a camera module by using a camera mountable on a car is used for the auxiliary device.
9. The auxiliary device module according to claim 7, wherein a camera module by using a camera mountable on a car is used for the auxiliary device.