CN109116087A - A kind of current monitoring equipment - Google Patents
A kind of current monitoring equipment Download PDFInfo
- Publication number
- CN109116087A CN109116087A CN201811003039.3A CN201811003039A CN109116087A CN 109116087 A CN109116087 A CN 109116087A CN 201811003039 A CN201811003039 A CN 201811003039A CN 109116087 A CN109116087 A CN 109116087A
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- Prior art keywords
- current
- monitoring equipment
- current monitoring
- sampling apparatus
- display device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- 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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- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The present invention relates to a kind of current monitoring equipments, belong to current monitoring technique field.A kind of current monitoring equipment, including display device and sampling apparatus, sampling apparatus is electrically connected to display device, wherein, the display device includes CPU processor, signal conditioning circuit, human-computer interaction module and communication module, and the CPU processor, signal conditioning circuit, human-computer interaction module and communication module are electrically connected to the sampling apparatus simultaneously.A kind of current monitoring equipment, the floating current of battery pack is monitored by the electromagnetic current transducer of small-range, by current divider monitor battery pack fill and discharge test electric current, can be realized the accurate monitoring of battery pack current, and monitoring range is wide, required precision is high.
Description
Technical field
The invention belongs to current monitoring technique fields, and in particular to a kind of current monitoring equipment.
Background technique
Direct current system is to be applied to waterpower, thermal power plant and all kinds of substations etc., is signalling arrangement, automatic device, thing
Therefore illumination, emergency power supply and the operation of breaker switching on and off provide the power-supply device of DC power supply.Direct current system is one independent
Power supply is not influenced by generator, station service and system operation mode, and in the case where external alternating current interrupts, electric power storage
Pond group continues to provide the important equipment of DC power supply.
Core of the storage batteries of transformer substation group as direct current system, electric power DC operation power source system power loss and battery
When group cannot timely power for load, it will make electric load and control load equipment that can not work, often cause big confession
Electrification causes entire direct current system power loss or even whole transformer station power loss, causes huge loss, therefore battery group
The anticipation in advance of state is particularly important, and is increasingly taken seriously, and needs to be monitored the on-line parameter of battery, due to
Valve controlled sealed lead-acid accumulator has floating charge to direct current system, fills and three kinds of working conditions of discharging, while in the most of the time
It is inside at floating charge state, wherein the floating current of battery group can be used as one of its anticipation foundation.However battery group
Need to carry out equal floating charge and discharge test, the charging and discharging currents of battery group are essentially 0.1C (C is accumulator capacity), if stored
The capacity of battery pack is several hundred ampere-hours, then the charging and discharging currents of battery group can reach tens amperes, can be with when discharge test
Reach several hundred amperes, therefore the detection of existing battery current is usually adopted by current divider or Hall current sensor
Sample, even if the precision of current divider can achieve 0.2%, also may be only accurate to 1A or so by taking 75mV/600A current divider as an example, but
When being that battery group carries out floating charge, floating current minimum can be tens mA (milliampere), therefore current divider cannot be detected accurately
To the battery group floating current of tens mA, therefore, current divider, which can only meet, to be filled or the precision of discharge current.With 600A amount
Journey, ratio be 1:5000 Hall current sensor for, even if precision can achieve 0.4%, also can only precision arrive 2A or so,
It can not be accurately detected the battery group floating current of tens mA, while excessive electric current can make conventional small-range Hall electricity
The hardware damage of flow sensor.
Battery pack electric current when filling can achieve tens A (ampere) or more, when electric discharge electric current can achieve several hundred A with
On, electric current when floating charge is very small, generally only several hundred mA or even tens mA, therefore, utilizes traditional battery current prison
Survey means at all can not accurate measurements battery group floating current.But accurate battery group floating current exists in battery
It is had very important effect in line monitoring and maintenance system, system can prejudge floating charge according to the situation of change of floating current
Battery group increases judgment basis for the safe operation of direct current system, increases direct current with the presence or absence of the phenomenon of open circuit in journey
The reliability and safety of system.
Summary of the invention
The present invention is directed to the situation of the prior art, overcomes drawbacks described above, provides a kind of current monitoring equipment.
The present invention uses following technical scheme, a kind of current monitoring equipment, including display device and sampling apparatus, adopts
Sampling device is electrically connected to display device, wherein the display device includes CPU processor, signal conditioning circuit, human-computer interaction mould
Block and communication module, the CPU processor, signal conditioning circuit, human-computer interaction module and communication module are electrically connected to institute simultaneously
State sampling apparatus.
As a further improvement of the above technical scheme, the sampling apparatus includes electromagnetic current transducer and shunting
Device, current divider are provided with electromagnetic current transducer in the current supply circuit for being serially connected in the current supply circuit of battery group.
As a further improvement of the above technical scheme, the human-computer interaction module includes key and charactron.
As a further improvement of the above technical scheme, the human-computer interaction module includes touch screen.
As a further improvement of the above technical scheme, the communication module is RS485.
As a further improvement of the above technical scheme, the communication module is CAN module.
A kind of current monitoring equipment disclosed by the invention, the beneficial effect is that, it is monitored by electromagnetic current transducer
The floating current of battery pack, by current divider monitor battery pack fill and discharge test electric current, can be realized battery pack current
Accurate monitoring, and monitoring range is wide, required precision is high；Also, since electromagnetic current transducer has magnetic saturation characteristic,
Current divider monitoring fill and discharge test during high current when, the hardware of electromagnetic current transducer will not be caused to damage
It is bad, to influence service life.
Detailed description of the invention
Fig. 1 is a kind of current monitoring equipment structural schematic diagram of the present invention.
Specific embodiment
The invention discloses a kind of current monitoring equipments, below with reference to preferred embodiment, to specific embodiment party of the invention
Formula is further described.
Current monitoring system as shown in Figure 1, including battery group current supply circuit and current monitoring device, wherein electric power storage
Anode, the cathode of pond group U is connected respectively to positive pole line end CL+, the negative busbar end CL- on the floating ground of direct current system, forms battery group
Current supply circuit.
Above-mentioned current monitoring device includes sampling apparatus, display device and direct current (DC) monitoring device.Sampling apparatus is by small-range
Electromagnetic current transducer C1 and current divider C2 composition, current divider C2 is serially connected between battery group cathode and negative busbar end
On current supply circuit, electromagnetic current transducer is arranged on the current supply circuit, i.e. the interstitial hole of electromagnetic current transducer passes through
The current supply circuit.
Display device includes CPU, signal conditioning circuit, communication module, human-computer interaction module, wherein CPU respectively with signal
Conditioning circuit, communication module, key and human-computer interaction module connection, signal conditioning circuit sample the above-mentioned small-range of connection respectively
Electromagnetic current transducer and current divider.Human-computer interaction module is key and charactron or touch screen.
The direct current (DC) monitoring device of current monitoring system, mainly includes a microprocessor, microprocessor by RS485 or
The communication module of CAN module connection display device.
Accurate sampling of the above-mentioned current divider for the bulk charge stream and discharge test electric current of battery pack, sampled value IF1；
The electromagnetic current transducer of above-mentioned small-range, such as 1A range, using the magnetic modulation technique principle of electromagnetic current transducer,
1A floating current below, sampled value IF2 can be accurately sampled, electromagnetic current transducer magnetic saturation in high current is protected
The hardware of card mutual inductor is not damaged, and saturation is moved back in low current rapidly and accurate sampling, while the remanent magnetism generated when magnetic saturation
Do not change output zero point and caused Full-span output, its own can be calibrated even if there is zero migration, be avoided suddenly
The disadvantage of the damage of small-range current transformer and sampling inaccuracy in the case of high current and unexpected low current.
Sampled value IF1 and IF2 enter CPU through signal conditioning circuit, by the key in man-machine interface to the electric current of sampling
Value calibrated, is configured to the IP address of its own and the setting of communication baud rate, and the charactron in man-machine interface is passed through
Electric current in practice is shown, communication module can fill the direct-current supervision given in direct current system on its current information
It sets, and carries out equal floating charge control and the open circuit anticipation of battery group.
If the floating current of current monitoring device is almost nil, then tentatively in the case that direct current system is in floating charge state
It is breaking possible to prejudge the appearance of battery group, then direct current (DC) monitoring device, which issues, fills order, if the electricity of current monitoring device at this time
Stream is still almost nil, then can be determined that open circuit occurs in battery group, then judge the single battery in battery group
Failure cell batteries are found out to be replaced.
If the electric current of current monitoring device is tens A at this time, then it is assumed that the probability that open circuit occurs in anticipation battery group is smaller,
Then discharge test progress core appearance test is being carried out, if the electric current of floating current monitoring device is several hundred A at this time, then it is assumed that anticipation
The judgement that open circuit occurs in battery group is likely to occur error.Meanwhile the anticipation of this floating current can go out to avoid when charging unit
When existing failure, battery group not can be carried out backup power source simultaneously and discharge, and cause the failure problems of entire direct current system paralysis.
The present invention is transformed the battery current sample circuit in existing electric power operation DC power system, no
Need complicated device that can complete the pre- of floating current, bulk charge stream, the monitoring of discharge test electric current and battery group open circuit
Sentence, do not increase the main electrical scheme of system, at low cost, realization conveniently, can also be to the new electric power operation DC power supply that will be carried out
System is directly applied.
For a person skilled in the art, technical solution documented by foregoing embodiments can still be repaired
Change or equivalent replacement of some of the technical features, it is all within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should be included in protection scope of the present invention.
Claims (6)
1. a kind of current monitoring equipment, which is characterized in that including display device and sampling apparatus, sampling apparatus is electrically connected to display
Device, wherein the display device includes CPU processor, signal conditioning circuit, human-computer interaction module and communication module, described
CPU processor, signal conditioning circuit, human-computer interaction module and communication module are electrically connected to the sampling apparatus simultaneously.
2. a kind of current monitoring equipment according to claim 1, which is characterized in that the sampling apparatus includes electromagnetic type electricity
Current transformer and current divider, current divider are provided with electricity in the current supply circuit for being serially connected in the current supply circuit of battery group
Magnetic-type current transformer.
3. current monitoring equipment according to claim 1, which is characterized in that the human-computer interaction module includes key sum number
Code pipe.
4. a kind of current monitoring equipment according to claim 1, which is characterized in that the human-computer interaction module includes touching
Screen.
5. a kind of current monitoring equipment according to claim 1, which is characterized in that the communication module is RS485.
6. a kind of current monitoring equipment according to claim 1, which is characterized in that the communication module is CAN module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811003039.3A CN109116087A (en) | 2018-08-30 | 2018-08-30 | A kind of current monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811003039.3A CN109116087A (en) | 2018-08-30 | 2018-08-30 | A kind of current monitoring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109116087A true CN109116087A (en) | 2019-01-01 |
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ID=64861446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811003039.3A Pending CN109116087A (en) | 2018-08-30 | 2018-08-30 | A kind of current monitoring equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109116087A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922329A (en) * | 2021-08-31 | 2022-01-11 | 科华数据股份有限公司 | Power supply circuit adjusting method and device and power supply system |
-
2018
- 2018-08-30 CN CN201811003039.3A patent/CN109116087A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922329A (en) * | 2021-08-31 | 2022-01-11 | 科华数据股份有限公司 | Power supply circuit adjusting method and device and power supply system |
| CN113922329B (en) * | 2021-08-31 | 2024-03-15 | 科华数据股份有限公司 | Power supply circuit adjusting method and device and power supply system |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190101 |
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| WD01 | Invention patent application deemed withdrawn after publication |