CN108051696A - A kind of detection method for detection device connection status - Google Patents
A kind of detection method for detection device connection status Download PDFInfo
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- CN108051696A CN108051696A CN201711308979.9A CN201711308979A CN108051696A CN 108051696 A CN108051696 A CN 108051696A CN 201711308979 A CN201711308979 A CN 201711308979A CN 108051696 A CN108051696 A CN 108051696A
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- connection status
- interval value
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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
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
Abstract
The present invention relates to a kind of detection methods for detection device connection status, and solution is the technical issues of real-time is poor, measurement method is complicated, by using step 1：Any one voltage value compared with opposite common point of low-voltage power supply system is measured by field measurement apparatus, it is device metal shell with respect to common point, and voltage drop of the measurement center line for device metal shell, and measurement data is passed through into network transmission to management platform；Step 2：First interval value is defined by management platform, first interval value is device with the voltage drop normal interval between mutually different nodes；Step 3：Voltage drop △ U1 between the same phase difference node of computing device；Step 4：Compare △ U1 and first interval value, if △ U1 are in first interval value, then it is normal to judge connection status；If △ U1 are comprised in outside first interval value, then judge technical solution of the connection status for failure, preferably resolve the problem, in being detected available for supply line.
Description
Technical field
The present invention relates to circuit detection fields, and in particular to a kind of detection method for detection device connection status.
Background technology
Connection resistance can be equivalent to being connected reactance for the connection status between each device of electric installation, and connection resistance is by electricity
What the D.C. resistance (abbreviation resistance) of device device current-carrying part generated when being connected with each other between each electrical installation crimps resistance
(abbreviation contact resistance) is formed；Connect exchange reactance (abbreviation reactance) phase between each electrical installation of reactance by electrical installation
Oxide capacitance generated when connecting etc. (referred to as contact reactance) is formed, any one phase of electric power system its electricity under certain operating mode
Resistance and excursion or being basically unchanged that the variation of reactive component is in a license, connection between electrical installation and tactile
It is equal reliable that contact condition between head, which is then required with normal electrical installation, and actual conditions are then the contact impedances between contact
(being made of geometry conjunction of the contact resistance with contacting reactance) can be as pressure becomes smaller or degree of oxidation increases and becomes larger even
It is to be off either abnormal condition, it is necessary to detect contact impedance as early as possible the phenomenon that contact impedance increase
Variation, finds the point more than excursion, to meet the needs securely and reliably powered.One complete power distribution equipment is except having
Primary device, which completes power supply, to be needed, it is necessary to be configured to the double measurement device of detection primary device operating mode.Since low pressure supplies
Electric radius can meet or exceed 500 meters, and what the same detection device for electric installation but can not possibly be synchronous is configured to so remote
Power supply distance, actual maintenance scene is usually with portable unit Site Detection by maintenance personnel.
Existing detection method is to be interrupted, is random, can not obtain the actual electrical parameters at device scene the same time, also
Can not system judgement for electric installation operating mode, thus caused by device defect of powering phase shortage, broken neutral line to user with
The economic loss and confession electric installation come be not in itself because the accident of power supply that these defects trigger is peanut.
Therefore it provides a kind of high detection method for detection device connection status of real-time is with regard to necessary.
The content of the invention
The technical problems to be solved by the invention are that real-time in the prior art is poor, the technology of measurement method complexity
Problem.A kind of new detection method for detection device connection status is provided, this is used for the detection of detection device connection status
Method has the characteristics that measurement real-time is high, safe, measurement method is simple.
In order to solve the above technical problems, the technical solution used is as follows：
A kind of detection method for detection device connection status, for low-voltage power supply system, the low-voltage power supply system
It is grounded including protective wire, protective wire ground wire is center line, and described device includes metal shell, and the detection method includes：
Step 1：Any one voltage compared with opposite common point of low-voltage power supply system is measured by field measurement apparatus
Value, opposite common point are the voltage drop of device metal shell and measurement center line for device metal shell, and by measurement data
Pass through network transmission to management platform；
Step 2：First interval value is defined by management platform, first interval value is device with the electricity between mutually different nodes
Pressure drop normal interval；
Step 3：Voltage drop △ U1 between the same phase difference node of computing device；
Step 4：Compare △ U1 and first interval value, if △ U1 are in first interval value, then decision maker connects shape
State is normal；If △ U1 are comprised in outside first interval value, then decision maker connection status is failure.
The operation principle of the present invention：Voltage of the detection method of the present invention according to any one closed circuit of voltage law
Be reduced to zero principle, make full use of the transmission advantage of network, by any one phase of same electric power system to protective wire PE or
The management platform of distal end is arrived using network transmission the different position PEN or the voltage of measurement point, at the scene nearby or utilization
Platform professional method obtains the data of needs by calculating and judges whether the phenomenon that data reflect be normal or abnormal.
In said program, for optimization, further, the detection method further includes：
Second interval value, voltage drop of the second interval value between the different mutually same nodes of device are defined by management platform
Normal interval value；Voltage drop △ U2 between the different mutually same nodes of computing device；As △ U2 are comprised in second interval value
Interior, then decision maker connection status is normal；If △ U2 are comprised in outside second interval value, then decision maker connection status is event
Barrier.
Further, it is U3 to define any phase voltage of electric power system, and it is standard value to preset U3 values, calculates center line and device gold
Belong to the difference dUN of same node on shell, decision maker connection status is normal if dUN is no more than default U3 values.Default U3
Value is the certain proportion of U3, can be 0.1 times of U3,0.3 times of U3 etc..
Further, the detection method further includes：It is continuous 2 with phase device to define pressure drop ratio by management platform
The change in pressure drop rate of above time point defines the normal interval that 3rd interval value is pressure drop ratio；It is U5 to calculate pressure drop ratio；Such as
U5 is comprised in 3rd interval value, then decision maker connection status is normal；If U5 is comprised in outside 3rd interval value, then sentence
Device connection status is determined for failure.
Further, the low-voltage power supply system includes U phases, V phases and W phases, and the center line is PE lines.
Further, the network is wireless network.
Further, the management platform is arranged on distal end.
Current low-voltage power supply system is used with by the way of protective ground line, i.e. three-phase four-wire system or Three-phase five-wire
System, three-phase are U phases, V phases, W phases respectively, neutral conductor N lines (or zero curve PEN) are also equipped with using what star connect to transformer, to protection
It is required that high whether star connects or corner connection also has protective wire PE lines, protective wire is generally connected with crust of the device, system earth net
Voltage-to-ground during for reducing Charging system generation leak current fault, the general material for selecting specification similary with the neutral conductor, and room
The satisfactory electrical conductivities metal such as band iron that is outer then using sufficient intensity and section or angle steel.
Beneficial effects of the present invention：The present invention given up existing alternate phase each to three-phase power line, angular frequency, just
The calculating and analysis of the complicated electrical parameters such as the different and different connection modes of phase angle, simply the voltage drop with regard to isopen road, which is used as, divides
Object is analysed, it, can be fixed by voltage, electric current because isopen road electrical parameter is basically identical, is simple connection in series-parallel relation each other
Rule carries out simple operation；Because all confession electric installations are by three-phase (two-phase) power supply either single phase poaer supply powering mode, adopt
It must be worked asynchronously as far as possible with device；To be connected between each device it is good, avoid contact with it is bad caused by fever even phase shortage,
The accident of electrical fire occurs.
The measurement parameter that the present invention obtains suitably adds measuring instrumentss just with existing measuring instrumentss or as needed, and
Measurement data is calculated using network transmission to distal end.Since the data that double measurement uploads are light current information to wire rod
Consumption is low；For measurement parameter based on voltage signal, measurement electric current is small small on electric installation is once supplied to influence；Sampled point can be on demand
It is distributed, device monitoring reliability is increased with the increase of distributed point, have the characteristics that the small income of investment is big.Centering of the present invention
Property the earth-free Medium voltage power supply system of point electrical installation connection state judgement also have certain meaning.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the detection method flow chart in embodiment 1.
Fig. 2, to calculate process schematic in detection method.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein is not used to limit only to explain the present invention
The fixed present invention.
Embodiment 1
The present embodiment provides a kind of detection method for detection device connection status, for low-voltage power supply system, low pressure
Electric power system uses three-phase four-wire system or three-phase five-wire mode, and three-phase is U phases, V phases, W phases respectively, and transformer is connect using star
Neutral conductor N lines (or zero curve PEN) are also equipped with, protective wire is generally connected with crust of the device, system earth net for reducing band Denso
Voltage-to-ground when leak current fault occurs is put, the shell of the device in the present embodiment is metal, PE or the protection that (PEN) is system
(neutral conductor for protective earthing-neutral conductor under three-phase four-wire system being both participation main circuit power supply takes into account protection use, such as Fig. 1, the inspection to line again
Survey method includes：
Step 1：Any one voltage compared with opposite common point of low-voltage power supply system is measured by field measurement apparatus
Value, opposite common point are the voltage drop of device metal shell and measurement center line for device metal shell, and by measurement data
Pass through network transmission to management platform；
Step 2：First interval value is defined by management platform, first interval value is device with the electricity between mutually different nodes
Pressure drop normal interval；
Step 3：Voltage drop △ U1 between the same phase difference node of computing device；
Step 4：Compare △ U1 and first interval value, if △ U1 are in first interval value, then decision maker connects shape
State is normal；If △ U1 are comprised in outside first interval value, then decision maker connection status is failure.
Wherein, network is more convenient by using wireless network.Specifically, U (V W) is arbitrary phase line；U1(V1
W1), U2 (V2 W2), U3 (V3 W3), U4 (V4 W4) are any one voltage compared with device metal shell；dU1(dV1
DW1) for any one phase switchgear with the voltage drop between phase；DU2 (dV2 dW2) is any one equipment that is connected between phase
Voltage drop；DU3 (dV3 dW3) is any one phase frequent movement equipment with the voltage drop between phase；DUN for N (in) it is opposite this
Voltage drop between system shell.
Such as Fig. 2, the node in the present embodiment refers to the tie point among switchgear, connection equipment and frequent movement equipment,
There are 4 nodes in same phase.Same phase distinct device is defined as referring in switchgear, connection equipment and frequent movement equipment not
Same equipment, abbreviation equipment.Voltage drop between same phase distinct device is defined as dU (dV dW), only when dU (dV dW) is specified
Load by when it is relatively sufficiently small, be only judge the normal foundation of connection status, and this it is relatively sufficiently small will also be from different phases
Between voltage drop compare.
The present embodiment is no more than 0.2 with mutually different node difference normal intervals by pre-setting, then is calculated in real time
With the value of mutually different nodes, the difference with mutually different nodes has 3 differences, is respectively：
DU1 (dV1 dW1)=U1 (V1 W1)-U2 (V2 W2)
DU2 (dV2 dW2)=U2 (V2 W2)-U3 (V3 W3)
DU3 (dV3 dW3)=U3 (V3 W3)-U4 (V4 W4)-dUPE
When same phase difference node difference difference be no more than 0.2 decision maker connection status it is normal, judge more than 0.2
Device connection status failure.Then it is the ideal state of connection when the difference of same phase difference node difference is 0.
Embodiment 2
The present embodiment is on the basis of embodiment 1 by pre-setting the normal interval of different mutually same node differences as not
More than 0.3, then calculate different mutually same node differences：
dU1(dU2 dU3)-dV1(dV2 dV3)
dU1(dU2 dU3)-dW1(dW2 dW3)
dV1(dV2 dV3)-dW1(dW2 dW3)
When different mutually same node differences be no more than 0.3 decision maker connection status it is normal, more than 0.3 decision maker
Connection status failure；When different mutually same node differences are that 0 current connection state is best.
The entire electric power system ground connection of the low explanation of the value of dUN is good, when system is uneven or neutral point connects it is bad when have
The value of one 30% or 20% or 10% (ratio is pre-set) for being no more than electric power system phase voltage, when the system neutral conductor breaks
Line or crimping bad are present with one close to system phase voltage.And hence it is also possible to pass through (PEN) line in calculating and common point (PE)
The comparison of same node difference time point difference and real-time phase voltage determines the connection status of center line.
Embodiment 3
The comparison data that the present embodiment uses on the basis of embodiment 2 are when same phase equipment is continuously two or more (point)
The change in pressure drop rate of section, this is defined herein as pressure drop ratio, also compare relatively with the voltage drop value of mutually same node difference time point
The voltage drop value of different mutually same node difference time points.
The normal value for defining pressure drop ratio is no more than 0.25, and calculating pressure drop ratio in real time has following several situations：
dU1t2(dV1t2 dW1t2)-dU1t1(dV1t1 dW1t1) be with mutually same node difference time point pressure drop difference；
(dU1t2-dU1t1)-(dV1t2-dV1t1) it is different mutually same node difference time point pressure drop differences；
(dU1t2-dU1t1)-(dW1t2-dW1t1) it is different mutually same node difference time point pressure drop differences；
(dV1t2-dV1t1)-(dW1t2-dW1t1) it is different mutually same node difference time point pressure drop differences；
dUNt2-dUNt1It is dress with respect to common point for the pressure drop difference of center line and the same node difference time point of opposite common point
Put metal shell.
When pressure drop ratio be no more than 0.25 decision maker connection status it is normal, more than 0.25 decision maker connection status
Failure；When pressure drop ratio be 0 current connection state when connection status it is best.
Because the ratio is the uninterrupted comparison of smaller continuous time point, only consider that the contact resistance variation between comparison point becomes
Gesture, that is, increase trend.And the change of voltage drop caused by the variation of electric current is either the same drop of same liter or is serious inclined
Phase, as long as being compared, point contact is good, can be rejected using the method for comparing pressure drop ratio.Therefore, when pressure drop ratio surpasses
The reason for normal interval must be loose contact is crossed, it can be as the judgment basis of equipment connection status.
Although the illustrative specific embodiment of the present invention is described above, in order to the technology of the art
Personnel are it will be appreciated that the present invention, but the present invention is not limited only to the scope of specific embodiment, to the common skill of the art
For art personnel, as long as long as various change appended claim limit and definite spirit and scope of the invention in, one
The innovation and creation using present inventive concept are cut in the row of protection.
Claims (7)
1. a kind of detection method for detection device connection status, for low-voltage power supply system, the low-voltage power supply system bag
Protective wire ground wire is included, protective wire ground wire is center line, and described device includes metal shell, which is characterized in that the detection side
Method includes：
Step 1：Any one voltage value compared with opposite common point of low-voltage power supply system, phase are measured by field measurement apparatus
For device metal shell and voltage drop of the center line for device metal shell is measured to common point, and measurement data is passed through
Network transmission is to management platform；
Step 2：First interval value is defined by management platform, first interval value is device with the voltage drop between mutually different nodes
Normal interval；
Step 3：Voltage drop △ U1 between the same phase difference node of computing device；
Step 4：Compare △ U1 and first interval value, if △ U1 are in first interval value, then decision maker connection status is
Normally；If △ U1 are comprised in outside first interval value, then decision maker connection status is failure.
2. the detection method according to claim 1 for detection device connection status, which is characterized in that the detection side
Method further includes：
Second interval value is defined by management platform, voltage drop of the second interval value between the different mutually same nodes of device is just
Normal interval value；Voltage drop △ U2 between the different mutually same nodes of computing device；If △ U2 are comprised in second interval value, then
Decision maker connection status is normal；If △ U2 are comprised in outside second interval value, then decision maker connection status is failure.
3. the detection method according to claim 2 for detection device connection status, which is characterized in that the detection side
Method further includes：Any phase voltage of definition electric power system is U3, and it is standard value to preset U3 values, is calculated on center line and device metal shell
The difference dUN of same node, decision maker connection status is normal if dUN is no more than default U3 values.
4. the detection method according to claim 1 for detection device connection status, which is characterized in that the detection side
Method further includes：
It is the change in pressure drop rate with the time point of continuous 2 of phase device or more to define pressure drop ratio by management platform, defines the 3rd
Interval value is the normal interval of pressure drop ratio；It is U5 to calculate pressure drop ratio；If U5 is comprised in 3rd interval value, then judge to fill
It is normal to put connection status；If U5 is comprised in outside 3rd interval value, then decision maker connection status is failure.
5. according to any detection methods for detection device connection status of claim 1-4, which is characterized in that described
Low-voltage power supply system includes U phases, V phases and W phases, and the center line is PE lines.
6. according to the detection method for detection device connection status described in claim 5, which is characterized in that the network is nothing
Gauze network.
7. according to the detection method for detection device connection status described in claim 5, which is characterized in that the management platform
It is arranged on distal end.
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Cited By (2)
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| CN111796217A (en) * | 2020-07-28 | 2020-10-20 | 宁夏中科天际防雷股份有限公司 | Intelligent detection device, system and method for disconnection card |
| US11714141B2 (en) | 2020-08-21 | 2023-08-01 | Hewlett-Packard Development Company, L.P. | Status of device connections |
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Application publication date: 20180518 |