CN109375028A - A kind of broken string recognition methods of high voltage power cable circulating current sensor and device - Google Patents
A kind of broken string recognition methods of high voltage power cable circulating current sensor and device Download PDFInfo
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- CN109375028A CN109375028A CN201810983631.8A CN201810983631A CN109375028A CN 109375028 A CN109375028 A CN 109375028A CN 201810983631 A CN201810983631 A CN 201810983631A CN 109375028 A CN109375028 A CN 109375028A
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- circulating current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The present invention relates to high voltage power cable detection fields, and in particular to a kind of broken string recognition methods of high voltage power cable circulating current sensor and device.The circulating current that the present invention passes through detection high voltage power cable three-phase, detection load electric current simultaneously, the case where whether the case where according to circulating current whether being zero combines load current to be zero carries out logic judgment, to show whether the circulating current sensor on high voltage power cable breaks.Circulating current across comparison is judged have the discrimination function of single-phase wire break, two-phase broken string and three-phase broken string, solve the hidden danger of cable sheath current loop disconnection by the present invention in conjunction with the relationship of circulating current and load current；The present invention is not required to increase any hardware cost, and control logic is simple, easy to accomplish.
Description
Technical field
The present invention relates to high voltage power cable detection fields, and in particular to a kind of high voltage power cable circulating current sensor
Break recognition methods and device.
Background technique
The metal sheath of 110kV and the above single-core cable generally using cross interconnected two sides earth or single-ended is directly grounded
The method of operation, metal sheath only has tens volts of induced voltage, induced current of several peaces to more than ten peaces over the ground under normal circumstances.Such as
Fruit cable sheath is damaged due to multipoint earthing because of reasons such as chemistry, mechanical or Rodents and pests, protective metal shell over the ground circulation will on
Dangerous level is risen to, it is serious security risk that persistent fever, which will affect insulating material properties, needs to find and take in time
Measure.High voltage power cable circulating current monitoring device can constantly be monitored circulating current, once abnormal can issue
Alarm signal reminds operations staff to handle in time, has become the important composition of high voltage power cable equipment on-line monitoring engineering at present
Part.
In engineering, circulating current sensor is mounted on the cross interconnected line of cable metal protective case or is connect in a manner of punching
Circulating current is acquired on ground wire, secondary output line accesses circulation monitoring device, and shield circulating current monitoring device passes circulating current
The secondary output signal of sensor improved, AD conversion, digital filtering and analytical calculation, judges whether circulating current is normal.In reality
In the engineer application of border, in equipment installation, construction wiring and operational process, the secondary output line disconnection of circulating current sensor, wiring
Phenomena such as clamped nipple loosens happens occasionally, when circulating current sensor secondary output loop open circuit, circulation monitoring device without
Method perceives the real working condition of circulating current, causes the circuit circulating current monitoring function to fail, in addition, if sending out in operational process
Raw broken string may cause circulating current and accidentally alert, and influence equipment normal operation.
Summary of the invention
The object of the present invention is to provide a kind of broken string recognition methods of high voltage power cable circulating current sensor and devices, use
It is accidentally alerted with being easy to appear when solving the problems, such as that the prior art monitors circulating current.
To achieve the above object, the present invention provides a kind of high voltage power cable circulating current sensor broken string identification sides
Method, comprising the following steps:
Detect the circulating current and load current on high voltage power cable three-phase；
If the circulating current of the phase or two-phase that detect cable is zero, and the circulating current of remaining phase is not zero,
Then determine the corresponding circulating current sensor broken string that circulating current is zero；
If detecting that the circulating current of cable three-phase is zero, and load current is not zero, then determines on three-phase
Circulating current sensor breaks.
Further, when having detected circulating current sensor broken string, corresponding warning message is issued.
The present invention also provides a kind of high voltage power cable circulating current sensor break identification device, including processor and
Memory, the processor are connected with circulating current sensor, and high voltage power cable is arranged in the circulating current sensor
On three-phase, the memory is stored with the instruction that the processor realizes following method:
Detect the circulating current and load current on high voltage power cable three-phase；
If the circulating current of the phase or two-phase that detect cable is zero, and the circulating current of remaining phase is not zero,
Then determine the corresponding circulating current sensor broken string that circulating current is zero；
If detecting that the circulating current of cable three-phase is zero, and load current is not zero, then determines on three-phase
Circulating current sensor breaks.
Further, when having detected circulating current sensor broken string, corresponding warning message is issued.
The present invention passes through the circulating current of detection high voltage power cable three-phase, while detection load electric current, according to sheath electricity
The case where whether the case where whether stream is zero combines load current to be zero carries out logic judgment, to obtain high voltage power cable
On circulating current sensor whether break.
The present invention is judged have list by circulating current across comparison, in conjunction with the relationship of circulating current and load current
The mutually discrimination function of broken string, two-phase broken string and three-phase broken string, solves the hidden danger of cable sheath current loop disconnection；The present invention is not
Any hardware cost need to be increased, control logic is simple, easy to accomplish.
Detailed description of the invention
Fig. 1 is the logic judgment schematic diagram that the method for the present invention judges sheath sensor single-phase wire break；
Fig. 2 is the logic judgment schematic diagram that the method for the present invention judges sheath sensor two-phase broken string；
Fig. 3 is the logic judgment schematic diagram that the method for the present invention judges sheath sensor three-phase broken string.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
It is an object of that present invention to provide a kind of broken string recognition methods of high voltage power cable circulating current sensor and devices, use
In realizing the whether normal real-time monitoring of high voltage power cable circulating current sensor secondary circuit and fault pre-alarming, sheath is promoted
The functionization of circulation monitoring device is horizontal.
To achieve the above object, the step of the method for the present invention includes:
One, cable sheath current sensor single-phase wire break differentiates: when certain phase circulating current is 0, and other two-phase sheaths are electric
Stream exists, it may be considered that the separate generation secondary circuit that circulating current is 0 breaks；
Two, cable sheath current sensor two-phase broken string differentiate: when certain two-phase circulating current be 0, and a remaining phase protect
Layer electric current exists, it may be considered that the separate generation secondary circuit that circulating current is 0 breaks；
Three, cable sheath current sensor three-phase broken string differentiate: when three-phase circulating current be 0, and load current exist, then
It is considered that three-phase broken string occurs for circulating current sensor.
Specific implementation process of the present invention is described as follows in conjunction with attached drawing.
(1) as shown in Figure 1, cable sheath current sensor single-phase wire break differentiates: high voltage power cable three-phase load is flat
Weighing apparatus, i.e., any phase load electric current exists, and three-phase load size of current is close and 120 ° of phase differential, therefore cable sheath electric current
There is induced voltage in sensor, when current sensor secondary circuit is normal, there are electric currents in circuit.When certain phase circulating current is
0, and other two-phase circulating currents exist, it is believed that the separate generation secondary circuit that circulating current is 0 breaks.Single-phase wire break is sentenced
According to as follows:
In formula, IAFor A phase circulating current, IB、ICFor the circulating current of B, C two-phase.
The delay t time provides " cable sheath current sensor A phase break alarm " signal after above-mentioned condition meets.At other
In embodiment, it is also possible to which the circulating current for detecting B phase or C phase is zero, and remaining two-phase has circulating current, then at this time may be used
To obtain the conclusion of corresponding circulating current sensor that circulating current is zero broken string.
(2) as shown in Fig. 2, cable sheath current sensor two-phase broken string differentiate: when certain two-phase circulating current be 0, and its
Its phase circulating current exists, it is believed that the separate generation secondary circuit that circulating current is 0 breaks, and two-phase breaks criterion such as
Under:
In formula, IA、IBFor A phase and B phase circulating current, ICFor C phase circulating current.
The delay t time provides " cable sheath current sensor A phase and B phase break alarm " signal after above-mentioned condition meets.
In other embodiments, it is also possible to which the circulating current for detecting B, C two-phase or A, C two-phase is zero, and a remaining phase has sheath
Electric current, the then at this time also it can be concluded that conclusion for the corresponding circulating current sensor broken string that circulating current is zero.
(3) as shown in figure 3, cable sheath current sensor three-phase broken string differentiates: the running load of high voltage power cable
Electric current can induce the load current of corresponding ratio in cable sheath, and the cable sheath current sensor three-phase not put into operation is disconnected
Circulating current sensor three-phase output valve is 0 when line, therefore the key that three-phase broken string differentiates is to identify whether cable puts into operation.
Present invention introduces the marks whether load current runs as cable, to be 0 in circulating current sensor three-phase output valve
When distinguish whether real three-phase break.
Three-phase broken string criterion is as follows:
In formula, IA、IB、ICFor A, B, C three-phase circulating current, IfhFor load current.
" cable sheath current sensor three-phase break alarm " signal is issued after the delay t time after above-mentioned condition meets.
The differentiation early warning of cable sheath current sensor single-phase wire break, two-phase broken string and three-phase broken string may be implemented in the present invention
Function, promotes power cable bulk state perception level, and engineering construction is simple and convenient.The present invention not only provides alarm signal, and
And it is separate to be explicitly indicated broken string, broken string is handled in time convenient for operations staff, with good engineering application value.
But the present invention is not limited to described embodiment, under the thinking that the present invention provides, using to this field skill
The mode being readily apparent that for art personnel converts the technological means in above-described embodiment, replaces, modifies, and play
Effect with the present invention in relevant art means it is essentially identical, realization goal of the invention it is also essentially identical, the technology formed in this way
Scheme is to be finely adjusted to be formed to above-described embodiment, and this technical solution is still fallen in protection scope of the present invention.
Claims (4)
- The recognition methods 1. a kind of high voltage power cable circulating current sensor breaks, which comprises the following steps:Detect the circulating current and load current on high voltage power cable three-phase；If the circulating current of the phase or two-phase that detect cable is zero, and the circulating current of remaining phase is not zero, then sentences Determine the corresponding circulating current sensor broken string that circulating current is zero；If detecting that the circulating current of cable three-phase is zero, and load current is not zero, then the sheath on three-phase is determined Current sensor breaks.
- The recognition methods 2. a kind of high voltage power cable circulating current sensor according to claim 1 breaks, feature exist In: when having detected circulating current sensor broken string, issue corresponding warning message.
- The identification device 3. a kind of high voltage power cable circulating current sensor breaks, including processor and memory, the processing Device is connected with circulating current sensor, and the circulating current sensor is arranged on the three-phase of high voltage power cable, and feature exists In: the memory is stored with the instruction that the processor realizes following method:Detect the circulating current and load current on high voltage power cable three-phase；If the circulating current of the phase or two-phase that detect cable is zero, and the circulating current of remaining phase is not zero, then sentences Determine the corresponding circulating current sensor broken string that circulating current is zero；If detecting that the circulating current of cable three-phase is zero, and load current is not zero, then the sheath on three-phase is determined Current sensor breaks.
- The identification device 4. a kind of high voltage power cable circulating current sensor according to claim 3 breaks, feature exist In: when having detected circulating current sensor broken string, issue corresponding warning message.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810983631.8A CN109375028A (en) | 2018-08-27 | 2018-08-27 | A kind of broken string recognition methods of high voltage power cable circulating current sensor and device |
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| CN201810983631.8A CN109375028A (en) | 2018-08-27 | 2018-08-27 | A kind of broken string recognition methods of high voltage power cable circulating current sensor and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110954846A (en) * | 2019-10-11 | 2020-04-03 | 珠海格力电器股份有限公司 | Hall current sensor disconnection detection method, computer readable storage medium and intelligent device |
| CN112147400A (en) * | 2020-09-27 | 2020-12-29 | 郑州中聖电子科技有限公司 | Accurate cable load acquisition device and method |
| CN113311284A (en) * | 2020-02-26 | 2021-08-27 | 南京南瑞继保电气有限公司 | High-voltage cable sheath circulating current fault discrimination method based on fault characteristic curve |
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| CN113311284A (en) * | 2020-02-26 | 2021-08-27 | 南京南瑞继保电气有限公司 | High-voltage cable sheath circulating current fault discrimination method based on fault characteristic curve |
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Application publication date: 20190222 |
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