CN2854617Y

CN2854617Y - Optical signal tester of short-circuit and earth fault indicator

Info

Publication number: CN2854617Y
Application number: CN 200520062363
Authority: CN
Inventors: 余凯; 罗建生; 张家明; 邓灼辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-08-04
Filing date: 2005-08-04
Publication date: 2007-01-03
Anticipated expiration: 2015-08-04

Abstract

The utility model discloses a short circuit and grounding failure indicator optical signal test meter, which comprises a control module, an input/output module and a battery inspection module. Wherein, the control module can drive the input / output module's optical fiber's output of optical pulse signal of low level 6, 148us and high level 3, 810us and the battery inspection module will provide signal when the working battery capacity is low. The utility model has the advantages that it can judge if the failure indicator can work normally after the installation and the operation of the failure indicator or the power off of the circuit so as to reduce the misinformation, circuit failure omission due to the failure of the indicator.

Description

Short circuit and earth-fault indicator optical signal type tester

Technical field

The utility model relates to the on-spot tester of a kind of ultra-high-tension power transmission line, especially a kind of tester that behind the installation fault detector, can carry out on-the-spot online detection with short circuit and earth-fault indicator.

Background technology

At present, in electric system, fault detector has been widely used in the short circuit and the earth fault indication of 10kV-35kV electric pressure.Fault detector is in sleep state when the power circuit non-fault, have only just to understand starter gear provide warning when the fault of trigger condition having occurred satisfying.In a single day the probability that power circuit breaks down under the normal condition is very low, and breaks down, then require fault detector be able to accurately catch.But at present the fault detector of the various models of different manufacturers of on-the-spot operation does not generally have on-the-spot detection means, can not online detection failure indicator, occur easily owing to fault detector malfunctioning caused wrong report, fails to report fault.

Summary of the invention

In order to realize the on-the-spot test of fault detector, the utility model provides a kind of short circuit and earth-fault indicator optical signal type tester, this tester can be easily after the fault detector installation or in service, under the situation of line outage, at any time whether the detection failure indicator is normal with definite fault detector work.

Technical solution of the present utility model is: short circuit and earth-fault indicator optical signal type tester are connected to form by control module, input/output module and battery detecting module, wherein control module can drive the optical fiber head output low level 6148us in the input/output module, high level 3810us, cycle is about the light pulse signal of 100Hz, and the battery detecting module can provide cue when the working battery capacity is low.

According to calculating (GB/T 15544-1995) about three-phase alternating current system short-circuit electric current among the State Standard of the People's Republic of China, Fig. 1, Fig. 2 is respectively far, the current waveform figure during the near-end short circuit, by on the figure as can be seen the frequency of short-circuit current still keep system frequency, be 50Hz in this frequency of China.Short-circuit sensor detects this fault-signal, will export one group of light signal if satisfy setting value, and this signal representative value is low level 6148us, high level 3810us, and the cycle is about the light pulse signal of 100Hz.

Owing to when the normal switching of circuit, can produce dash current greater than the normal load electric current, for the influence that keeps away this dash current can not be judged as fault current with his mistake, the light pulse signal of the optical fiber head output in the described control module driving input/output module is the continuous impulse signal greater than 50mS.

Described control module is the 16F877A single-chip microcomputer, and its power supply that uses is the 3.6V chargeable lithium cell.

The utility model has the advantages that: can be easily after the fault detector installation or in service, under the situation of line outage, whether the failure judgement indicator working properly, to reduce owing to the wrong report that the fault of fault detector own is brought, fail to report line fault.

Description of drawings

Current waveform figure during the short circuit of Fig. 1 far-end;

The current waveform figure of Fig. 2 near-end short circuit;

The functional block diagram of Fig. 3 embodiment of the invention;

The voltage modulated output and the battery management process flow diagram of Fig. 4 embodiment of the invention;

" k is an initial symmetrical short-circuit current to I in accompanying drawing 1 and accompanying drawing 2; Ip is a peak value of short; Ik is a steady-state shortcircuit current; IDC is a DC component of short-circuit current; A is the initial value of aperiodic component iDC; 1, control module, 2, input/output module, 3, the battery detecting module.

Embodiment

Embodiment: shown in Fig. 3 and 4, short circuit and earth-fault indicator optical signal type tester are connected to form by control module 1, input/output module 2 and battery detecting module 3, wherein control module 1 can drive the optical fiber head output low level 6148us in the input/output module 2, high level 3810us, cycle is about the continuous light pulse signal of 50ms at least of 100Hz, and battery detecting module 3 can provide cue when the working battery capacity is low.Described control module 1 is the 16F877A single-chip microcomputer, and its power supply that uses is the 3.6V chargeable lithium cell.

Be economize on electricity, the back control module 1 that powers on enters sleep state, waking up of keyboard in the wait input/output module 2 or battery electric quantity low signal, if it is low that battery detecting module 3 detects battery electric quantity, then control module 1 drives input/output module 2, corresponding lithium electric alarm LED indication is lighted, require to change battery; If the output of board light signal, then control module 1 drives the optical fiber head output optical pulse of input/output module 2, and simultaneously the optical fiber head LED indication of correspondence is lighted.

Claims

1, a kind of short circuit and earth-fault indicator optical signal type tester, it is characterized in that: it is made up of input/output module (2) that is electrically connected with control module (1) respectively and battery detecting module (3), wherein control module (1) can drive the optical fiber head output low level 6148us in the input/output module (2), high level 3810us, cycle is about the light pulse signal of 100Hz, and battery detecting module (3) can provide cue when the working battery capacity is low.

2, short circuit according to claim 1 and earth-fault indicator optical signal type tester is characterized in that: the light pulse signal that described control module (1) drives the optical fiber head output in the input/output module (2) is the continuous impulse signal greater than 50mS.

3, short circuit according to claim 1 and 2 and earth-fault indicator optical signal type tester is characterized in that: described control module (1) is the 16F877A single-chip microcomputer, and its power supply that uses is the 3.6V chargeable lithium cell.