CN208860916U - Null line breaking alarm positioning device - Google Patents
Null line breaking alarm positioning device Download PDFInfo
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- CN208860916U CN208860916U CN201821505563.6U CN201821505563U CN208860916U CN 208860916 U CN208860916 U CN 208860916U CN 201821505563 U CN201821505563 U CN 201821505563U CN 208860916 U CN208860916 U CN 208860916U
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- alarm
- neutral line
- break
- voltage
- pressure limiting
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Abstract
The utility model discloses a kind of null line breaking alarm positioning devices, including neutral line break alarm element, neutral line break setting element, the neutral line break alarm element includes ground capacity C, voltage measurement element, wire break alarm, the ground capacity C is secured to zero curve end and is grounded, voltage measurement element voltage value to measure ground capacity C in parallel with ground capacity C, wire break alarm is connected with voltage measurement element, and when the measured value of voltage measurement element is more than setting value, wire break alarm is alarmed；The neutral line break setting element includes current measurement device, rectification pressure limiting circuit, indicator light, the current measurement device is connected with rectification pressure limiting circuit, the rectification pressure limiting circuit is connected with indicator light, and the current measurement device is series at each station equipment between the contact on zero curve.The utility model accurately reacts and alarms when neutral line break failure occurs, and broken string region is accurately positioned when neutral line break failure occurs.
Description
Technical field
The utility model relates to a kind of null line breaking alarm positioning devices, belong to power equipment
Technical field.
Background technique
The normal operation of substation's station electricity consumption AC system is most important for stablizing for substation.Three-phase four-wire system wiring
Mode is the common power supply mode of station power use system, and the disconnection fault of zero curve detects the reliable and stable operation for station equipment
It is particularly significant, and the disconnection fault of zero curve is one of the failure that substation is most difficult to discovery.When substation station power supply system zero
When line breaks, standing will be shifted with the neutral point displacement voltage of power supply system side, may cause a large amount of station equipment burnouts.Root
According to the daily working condition of substation, the shortcoming of existing station power use system wire break detection method is as follows:
1. the detection method without professional system: existing substation is fitted without the device of particular detection neutral line break, when
When neutral line break occurs for system, system can not accurately react disconnection fault, and the equipment component longtime running that causes to break is in over-voltage
Or under-voltage condition.Field operator, service personnel are mainly the operating condition for passing through inspection station equipment, judge zero indirectly
Line disconnection fault, accuracy is related with the working experience of staff and workmanship, is unable to satisfy work on the spot requirement.
2. failure can not be found in time: neutral line break failure can only be found by round-about way, so working as system
There is no fault-signal when neutral line break, needs operation maintenance personnel that could find when making an inspection tour equipment；Due to that cannot discover and rule out in time
Disconnection fault, some equipment work long hours in overvoltage condition, reduce equipment life；Some equipment run on under-voltage condition, drop
Its low reliability.Since station equipment is unable to operate normally, the safety of crisis substation, the consequence that may cause is extremely dangerous.
3. broken position accurately can not be positioned: disconnected zero curve occurs since substation's station system wiring mode is complicated
When line, break point can not be intuitively found out, needs to increase maintenance according to station equipment voltage and current situation suspected fault point and apply
Work difficulty and repair time, reduce equipment dependability.
Utility model content
The purpose of this utility model is to provide a kind of null line breaking alarm positioning devices, specially
Door is directed to neutral line break accident design, when neutral line break failure occurs, issues break alarm signal at the first time, notifies on duty
Regulation personnel；And break point is accurately found out according to setting element, service personnel is helped quickly to search and excludes broken string event
Barrier in turn ensures the reliability of system under the premise of reducing workload, shortening working hours.
The purpose of this utility model is achieved by the following technical programs:
A kind of null line breaking alarm positioning device, including neutral line break alarm element 1, zero curve
Break setting element 2, and the neutral line break alarm element 1 includes ground capacity C, voltage measurement element 3, wire break alarm 4, institute
It states ground capacity C to be secured to zero curve end and be grounded, the voltage measurement element 3 is in parallel with ground capacity C to measure ground connection electricity
Hold the voltage value of C, wire break alarm 4 is connected with voltage measurement element 3, when the measured value of voltage measurement element 3 is more than setting value
When wire break alarm 4 alarm；
The neutral line break setting element 2 includes current measurement device 5, rectification pressure limiting circuit 6, indicator light 7, the electric current
Measuring cell 5 is connected with rectification pressure limiting circuit 6, and the rectification pressure limiting circuit 6 is connected with indicator light 7, the current measurement device 5
Each station equipment is series between the contact on zero curve.
The purpose of this utility model can also be further realized by following technical measures:
Aforementioned null line breaking alarm positioning device, voltage measurement element 3 use voltmeter.
Aforementioned null line breaking alarm positioning device, wire break alarm 4 use indicator light or electricity
Bell.
Aforementioned null line breaking alarm positioning device, current measurement device 5 use ammeter.
Aforementioned null line breaking alarm positioning device, rectification pressure limiting circuit 6 are whole using 78 series
Flow integrated package of pressure-stabilizing.
Compared with prior art, the utility model has the beneficial effects that the neutral line break alarm element of the utility model exists
When neutral line break failure occurs, it accurately can rapidly react and issue alarm signal, remind tune on duty at the first time
Control personnel or operation maintenance personnel race against time for the investigation of failure, shorten the equipment irregular operating time, improve the confession of system
Electric reliability.
Neutral line break setting element can accurately position broken string region, help to run when neutral line break failure occurs
And service personnel quickly searches and shortens the equipment irregular operating time with debugging, raising working efficiency, reducing failure influences
Range.
Detailed description of the invention
Fig. 1 is substation's station system three-phase four-line system figure；
Fig. 2 is neutral line break alarm element circuit structure diagram；
Fig. 3 is substation's station power use system neutral line break alarm principle figure；
Fig. 4 is neutral line break setting element circuit structure diagram；
Fig. 5 is substation's station power use system neutral line break positioning schematic；
Fig. 6 is neutral line break alarm element, neutral line break setting element application implementation example diagram simultaneously.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, substation station uses three-phase four-wire system with system, stands and be connected to A, B, C with load one end
Xiang Shang, the other end are connected on zero curve, zero curve first section ground connection.
As shown in Fig. 2, the utility model null line breaking alarm positioning device, including zero curve are disconnected
Line alarm element 1, neutral line break setting element 2, the neutral line break alarm element 1 include ground capacity C, voltage measurement element
3, wire break alarm 4, as shown in figure 3, the ground capacity C is secured to zero curve end and is grounded, the voltage measurement element 3 with
To measure the voltage value of ground capacity C, wire break alarm 4 is connected with voltage measurement element 3 for ground capacity C parallel connection, when voltage is surveyed
Wire break alarm 4 is alarmed when measuring the measured value of element 3 more than setting value；As shown in figure 4, the neutral line break setting element 2 wraps
Current measurement device 5, rectification pressure limiting circuit 6, indicator light 7 are included, the current measurement device 5 is connected with rectification pressure limiting circuit 6, institute
It states rectification pressure limiting circuit 6 to be connected with indicator light 7, exist as shown in figure 5, the current measurement device 5 is series at each station equipment
Between contact on zero curve.
The voltage measurement element 3 uses voltmeter, and voltmeter band is more than setting value then contact output action function, works as electricity
It presses the indicator light of table contact action drives wire break alarm 4 bright or electric bell is rung；Current measurement device 5 uses ammeter, and will be electric
Input rectifying pressure limiting circuit 6 is flowed, rectification pressure limiting circuit 6 rectifies pressure limiting when there is electric current using 78 serial rectifying and voltage-stabilizing integrated packages
6 output voltage of circuit driving indicator light 7 is lighted.
Null line breaking alarm method are as follows: install zero curve end additional ground capacity C and be grounded, make
Pass through one if voltage measurement element measured value is more than voltage threshold with the voltage value of voltage measurement element measurement ground capacity C
Alarm element issues alarm signal.
As shown in figure 3, ground capacity is installed additional in zero curve end, and when capacitor both end voltage is zero, no break alarm signal, when
Capacitance voltage is not zero, and sends out break alarm signal.Its working principle is that: under normal operating conditions, zero curve head end ground connection is all negative
The star-connection mode for being considered as neutral ground is carried, when not considering the effect of line impedance, zero curve terminal voltage be should be
0, no break alarm signal.And when zero curve somewhere is broken, zero curve is divided into both ends, due to there are grounding point before breakpoint D,
Neutral voltage not yet 0, all loads for being connected to this section are still considered as the star-connection mode of neutral ground, and load can be normal
Operation；The no ground point of zero curve after breakpoint D, all loads for being connected to this section are still considered as the star-like of isolated neutral and connect
Line mode, since each phase load is not quite similar, neutral point voltage offset, i.e., this section of neutral voltage is not 0, and wire break alarm issues
Alarm signal.
Null line breaking localization method are as follows: in each station equipment between the contact on zero curve
Series connection neutral line break setting element, neutral line break setting element include current measurement device, rectification pressure limiting circuit, indicator light, institute
It states current measurement device to be connected with rectification pressure limiting circuit, the rectification pressure limiting circuit is connected with indicator light, if there is electric current passes through
When current measurement device, drive indicator light bright by rectification pressure limiting circuit, when no current passes through current measurement device, indicator light
It goes out, indicator light off, and place is then broken position, realizes the positioning to broken string.As shown in figure 5, the zero curve among two neighboring load
Duan Shang installs neutral line break setting element additional, when a current passes through, indicator lit, when no current passes through, indicator lamp
It goes out.Its principle are as follows: when normal work, since each phase load size is equal not to the utmost, threephase load balance a possibility that very low, institute
With every section of zero curve has electric current to pass through, i.e., all indicator lamps are all bright.When broken string D failure occurs, indicator institute at A1, A3
There is electric current to flow through in nil segment, indicator lit, and nil segment broken string where A2, no current flow through, indicator lamp goes out, positioning
Short-term point is where A2 on nil segment.Broken string position can be accurately positioned with the method.
As shown in fig. 6, neutral line break alarm element, neutral line break setting element are mounted on station power use system simultaneously,
Its work-based logic is as shown in the table.
| Wire break alarm | A1 | A2 | A3 | …… | |
| Normally | Alarm free | It is bright | It is bright | It is bright | …… |
| D1 | There is alarm | It goes out | It is bright | It is bright | …… |
| D2 | There is alarm | It is bright | It goes out | It is bright | …… |
| D3 | There is alarm | It is bright | It is bright | It goes out | …… |
| …… | …… | …… | …… | …… | …… |
In addition to the implementation, the utility model can also have other embodiments, all to use equivalent replacement or equivalent change
The technical solution to be formed is changed, is all fallen in the protection scope of the requires of the utility model.
Claims (5)
1. a kind of null line breaking alarm positioning device, which is characterized in that alarm including neutral line break
Element, neutral line break setting element, the neutral line break alarm element include ground capacity C, voltage measurement element, break alarm
Device, the ground capacity C are secured to zero curve end and are grounded, and the voltage measurement element is in parallel with ground capacity C to be connect with measuring
The voltage value of ground capacitor C, wire break alarm are connected with voltage measurement element, when the measured value of voltage measurement element is more than setting value
When wire break alarm alarm；The neutral line break setting element includes current measurement device, rectification pressure limiting circuit, indicator light, institute
It states current measurement device to be connected with rectification pressure limiting circuit, the rectification pressure limiting circuit is connected with indicator light, the current measurement member
Part is series at each station equipment between the contact on zero curve.
2. null line breaking alarm positioning device as described in claim 1, which is characterized in that described
Voltage measurement element uses voltmeter.
3. null line breaking alarm positioning device as described in claim 1, which is characterized in that described
Wire break alarm uses indicator light or electric bell.
4. null line breaking alarm positioning device as described in claim 1, which is characterized in that described
Current measurement device uses ammeter.
5. null line breaking alarm positioning device as described in claim 1, which is characterized in that described
Pressure limiting circuit is rectified using 78 serial rectifying and voltage-stabilizing integrated packages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821505563.6U CN208860916U (en) | 2018-09-14 | 2018-09-14 | Null line breaking alarm positioning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821505563.6U CN208860916U (en) | 2018-09-14 | 2018-09-14 | Null line breaking alarm positioning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208860916U true CN208860916U (en) | 2019-05-14 |
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ID=66418003
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821505563.6U Active CN208860916U (en) | 2018-09-14 | 2018-09-14 | Null line breaking alarm positioning device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061394A (en) * | 2018-09-14 | 2018-12-21 | 国网江苏省电力有限公司镇江供电分公司 | Null line breaking alarm positioning device and method |
-
2018
- 2018-09-14 CN CN201821505563.6U patent/CN208860916U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061394A (en) * | 2018-09-14 | 2018-12-21 | 国网江苏省电力有限公司镇江供电分公司 | Null line breaking alarm positioning device and method |
| CN109061394B (en) * | 2018-09-14 | 2023-10-13 | 国网江苏省电力有限公司镇江供电分公司 | Zero line breakage alarm positioning device and method for three-phase four-wire system power supply system |
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