CN1058472A - Line discontinuity monitor for low-voltage power transmission line - Google Patents
Line discontinuity monitor for low-voltage power transmission line Download PDFInfo
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- CN1058472A CN1058472A CN 90104604 CN90104604A CN1058472A CN 1058472 A CN1058472 A CN 1058472A CN 90104604 CN90104604 CN 90104604 CN 90104604 A CN90104604 A CN 90104604A CN 1058472 A CN1058472 A CN 1058472A
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- power
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- down mode
- power down
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Abstract
The present invention relates to a kind of line discontinuity monitor for low-voltage power transmission line, it is made up of power supply state signal deteching circuit, waveform transformation circuit, logic gates, control circuit, alarm and protection circuit, power down mode signal deteching circuit, power down mode logic gates, power down mode control circuit, power supply etc.The present invention is when having a power failure, power line as the low-resistance lead, three groups of coils are connected into star (or triangle) and form loop under the off-position at the power line other end, low-voltage dc signal is sent into power line, press signal to judge whether power line breaks according to institute's power taking.The present invention can carry out on-line monitor to low-voltage-powered line under power supply and power down mode, and can in time report to the police and automatic protection power-equipment.
Description
The present invention relates to a kind of monitor, particularly a kind of line discontinuity monitor for low-voltage power transmission line.
In the prior art, having several different methods can detect low-voltage-powered line disconnection signal, generally is to realize cutting off the power-equipment power supply by control circuit, reaches the purpose of protection power-equipment.Signal detection method commonly used is to utilize elements taking-up voltage or current signals such as serial or parallel connection mutual inductor, relay, resistance, electric capacity, diode on power line, judges with this signal whether power line breaks.But it can not carry out on-line monitor to power line under power supply and power down mode, when causing broken string when the power line power failure or for reasons such as disaster, artificial destructions, can not in time find and protect power-equipment.
The objective of the invention is to avoid above-mentioned the deficiencies in the prior art part and provide a kind of and can under power supply and power down mode, carry out on-line monitor, and in time report to the police and protect the line discontinuity monitor for low-voltage power transmission line of power-equipment automatically low-voltage-powered line.
Purpose of the present invention can reach by following measure: the present invention includes power supply state signal deteching circuit, waveform transformation circuit, logic gates, control circuit, alarm and protection circuit, power supply; it is characterized in that: also have power down mode signal deteching circuit, power down mode logic gates, power down mode control circuit, the detected signal of power down mode signal deteching circuit is delivered to the alarm and protection circuit via power down mode logic gates, power down mode control circuit.Resistance R 4 is by the normally opened contact J1aK1 of relay J 1a in the power down mode signal deteching circuit, the elementary winding A ' of B4, low-voltage-powered line X meets B1, R5 is by the normally opened contact J1aK2 of relay J 1a, the elementary winding B ' of B5, low-voltage-powered line y meets B2, after connecting with battery E, passes through R6 the normally opened contact J1bK1 of relay J 1b, the elementary winding C ' of B6, low-voltage-powered line Z meets B3, R4 also joins with the base stage of BG5, the base stage of R5 and BG6 is joined, BG5, the collector of BG6 respectively with the power down mode logic gates in or the door F3 input 1,2 ends join, the base stage of BG4 in the output 3 termination power down mode control circuits of F3, the coil of the collector connecting relay J02 of BG4.
Fig. 1 is a functional-block diagram of the present invention;
Fig. 2 is an electrical schematic diagram of the present invention.
The present invention is described in further detail below in conjunction with accompanying drawing (embodiment):
With reference to Fig. 1, the present invention is made up of power supply state signal deteching circuit 1, waveform transformation circuit 2, logic gates 3, control circuit 4, alarm and protection circuit 5, power down mode signal deteching circuit 6, power down mode logic gates 7, power down mode control circuit 8, power supply 9 etc.
With reference to Fig. 2, whether under power supply state, the B4 in the power supply state signal deteching circuit 1, B5, the elementary winding A ' of B6, B ', C ' are attempted by on power line X, Y, the Z by star, have voltage to judge whether circuit breaks with electrical network.Signal takes out from B4, B5, B6 level A, B, C, deliver to BG7, BG8, BG9 behind D1 in waveform transformation circuit 2, D2, D3, C1, C2, the C3 rectifying and wave-filtering, the output of BG7, BG8, BG9 deliver in the logic gates 3 or door F1(also deliver to simultaneously and a door F2), by or gate control relay J 01.F1 output high level when arbitrary or two power lines disconnect, the J01 action, chimes of doom is sent in hummer DY energising; Relay J 03 action simultaneously in parallel with DY, its normally closed contact J03b1 disconnects, and makes contactor J04 dead electricity, and its normally closed contact J04b1, J04b2, J04b3 disconnect, and cut off the total output power supply.Can simultaneously not disconnect because of power line X, Y, Z this moment, and BG7, BG8, BG9 can not export high level simultaneously, so can not move with door F2, relay J 1a, J1b keep original state.
When electrical network when power supply state becomes power down mode, BG7, BG8, BG9 export high level simultaneously, thus with a door F2 output high level, BG2, BG3 conducting, J1a, J1b action automatically switches to direct current supply.Simultaneously, J04 moves because of dead electricity, and J04b1, J04b2, J04b3 discharge, and cut off the total output power supply.The elementary winding A ' of B4, B5, B6, B ', C ' connect (J1ak1, J1ab2, J1bk1 on) by star again with resistance R 4, R5, R6 series connection and after connecting direct current E respectively at this moment, and connect formation direct current low-resistance loop (power line can be used as the low-resistance lead) with connecting by star (or triangle) and be connected on by B1, B2, the B3 of the monitoring line segment other end.Whether detection signal self-resistance R4, R5, R6 take out, have DC voltage to judge whether circuit breaks by resistance.When three power lines disconnected, BG5 or BG6 output high level, or a door F3 also exports high level, the BG4 conducting, the J02 action, J02k1 connects, electric current was by DY, J02k1, J1bk2(on this moment when arbitrary) to ground, hummer DY is sounded the alarm.
When following three power lines of power supply state disconnected entirely, this monitor was operated in power down mode, and its course of work is with above-mentioned the same.
The present invention has following advantage compared to existing technology:
1. can under power supply and power down mode, carry out on-line monitor to low-voltage-powered line, when having a power failure or power line when breaking because the reasons such as natural calamity, artificial destruction cause, can both in time find and automatically protect power-equipment.
2. circuit is reasonable, dependable performance, and cost is lower.
Claims (2)
1, a kind of line discontinuity monitor for low-voltage power transmission line; comprise power supply state signal deteching circuit 1, waveform transformation circuit 2, logic gates 3, control circuit 4, alarm and protection circuit 5, power supply 9; it is characterized in that: also have power down mode signal deteching circuit 6, power down mode logic gates 7, power down mode control circuit 8, power down mode signal deteching circuit 7 detected signals are delivered to alarm and protection circuit 5 via power down mode logic gates 7, power down mode control circuit 8.
2, monitor according to claim 1, it is characterized in that: resistance R 4 is by the normally opened contact J1aK1 of relay J 1a in the power down mode signal deteching circuit 6, the elementary winding A ' of B4, low-voltage-powered line X meets B1, R5 is by the normally opened contact J1aK2 of relay J 1a, the elementary winding B ' of B5, low-voltage-powered line y meets B2, R6 connects the back by being the normally opened contact J1bK1 of relay J 1b with battery E, the elementary winding C ' of B6, low-voltage-powered line Z meets B3, R4 also joins with the base stage of BG5, the base stage of R5 and BG6 is joined, BG5, the collector of BG6 respectively with power down mode logic gates 7 in or the door F3 input 1,2 ends join, the base stage of BG4 in the output 3 termination power down mode control circuits 8 of F3, the coil of the collector connecting relay J02 of BG4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90104604 CN1058472A (en) | 1990-07-22 | 1990-07-22 | Line discontinuity monitor for low-voltage power transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90104604 CN1058472A (en) | 1990-07-22 | 1990-07-22 | Line discontinuity monitor for low-voltage power transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1058472A true CN1058472A (en) | 1992-02-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90104604 Pending CN1058472A (en) | 1990-07-22 | 1990-07-22 | Line discontinuity monitor for low-voltage power transmission line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1058472A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885424A (en) * | 2014-03-28 | 2014-06-25 | 大唐贵州发耳发电有限公司 | DCS system temperature line breakage protection logic |
-
1990
- 1990-07-22 CN CN 90104604 patent/CN1058472A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885424A (en) * | 2014-03-28 | 2014-06-25 | 大唐贵州发耳发电有限公司 | DCS system temperature line breakage protection logic |
| CN103885424B (en) * | 2014-03-28 | 2016-08-17 | 大唐贵州发耳发电有限公司 | A kind of DCS system temperature breaking protection gate |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |