CN207623458U - A kind of New insulated monitoring device with voltage compensation - Google Patents
A kind of New insulated monitoring device with voltage compensation Download PDFInfo
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- CN207623458U CN207623458U CN201721747461.0U CN201721747461U CN207623458U CN 207623458 U CN207623458 U CN 207623458U CN 201721747461 U CN201721747461 U CN 201721747461U CN 207623458 U CN207623458 U CN 207623458U
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Abstract
The utility model is related to DC system protection technical fields; bridge unit is compensated more particularly to a kind of New insulated monitoring device with voltage compensation, including sampling isolated location, amplification filter unit, AD sampling units, primary processor MCU units, display unit, alarm output unit, storage unit, insulation resistance detection unit, voltage deviation；The utility model is suitable for the DC power system of the different voltages grade such as 220V/110V/48V in substation or power plant, the Bus Voltage range of 0 300V can be detected, simultaneously according to the ratio size and system insulation state of positive and negative busbar voltage-to-ground, it is automatic to carry out voltage deviation compensation, make the ratio of positive and negative busbar voltage-to-ground between 0.95 1.05, it prevents that earth fault occurs due to system, insulation, which reduces, to be caused in DC power system after the offset of positive and negative anodes voltage-to-ground, and cause protective device action, DC power system is reduced because voltage deviation leads to the risk of false protection, be conducive to be promoted the DC power system operation and management level of substation or power plant.
Description
Technical field
The utility model is related to DC system protection technical fields, and in particular to a kind of New insulated with voltage compensation
Monitoring device.
Background technology
DC power system is applied to waterpower, thermal power plant, and all kinds of substations, straight-flow system is mainly by accumulator
The part such as group, charging unit, DC feeder screen, DC power distribution cabinet, DC power supply monitor, direct current branch feeder line forms, directly
Stream power-supply system is the system for providing electrical source of power to protection, its stability, reliability directly affects working condition.It influences straight
Flow power system stability, reliability factor in earth fault be one of major failure.When straight-flow system occur earth fault,
Insulation, which reduces, to be caused in DC power system after the offset of positive and negative anodes voltage-to-ground, and may result in positive and negative anodes pressure difference is more than protection
The startup voltage value of device repeat circuit, and then cause the action of protective device, to generate the serious system failure.And it is current
Already present most of Insulation Inspection Device for Direct-Current System is not equipped with voltage deviation compensation function.
Invention content
To solve the above-mentioned problems, the utility model provides a kind of New insulated monitoring device with voltage compensation,
Specific technical solution is as follows：
A kind of New insulated monitoring device with voltage compensation includes that sampling isolated location, amplification filter unit, AD are adopted
Sample unit, primary processor MCU units, display unit, alarm output unit, storage unit, insulation resistance detection unit, voltage are inclined
Difference compensation bridge unit；The sampling isolated location is connect with amplification filter unit；The amplification filter unit and AD sampling units
Connection；The AD sampling units are connect with primary processor MCU units；The display unit, alarm output unit, storage unit,
Insulation resistance detection unit, voltage deviation compensation bridge unit are connect with primary processor MCU units respectively；
The sampling isolated location includes partial pressure sampling module, isolation module；The partial pressure sampling module using resistance R1,
Resistance R2 partial pressures, are sampled using resistance R3；The isolation module includes phototube coupling unit；The phototube coupling unit by every
It is realized from linear optical coupling；
Straight-flow system busbar positive and negative anodes voltage-to-ground signal inputs after resistance R1, resistance R2 partial pressures and resistance R3 samplings
Phototube Coupling is carried out to isolation linear optical coupling, straight-flow system busbar positive and negative anodes voltage-to-ground signal is after partial pressure sampling and isolation
It is input to primary processor MCU units after sequentially inputting to amplification filter unit, the processing of AD sampling units and carries out calculation processing, then is defeated
Enter to display unit, storage unit, when the ratio of primary processor MCU unit judges straight-flow system busbar positive and negative anodes voltage-to-grounds is super
When going out false protection risk factors, primary processor MCU units can start alarm output unit and insulation resistance detection unit, insulation
Resistance detection unit detects the size of straight-flow system busbar positive and negative anodes insulation against ground resistance, and compensates bridge unit by voltage deviation
Straight-flow system positive and negative busbar voltage-to-ground is maintained into equilibrium state.
Further, the amplification factor of the isolation linear optical coupling is 8 times.
Further, the amplification filter unit includes amplifying circuit, filter circuit；The amplifying circuit includes amplification factor
For 1.5 times of level-one low-pass amplifier, the filter circuit is low-pass filter circuit.
Further, the AD sampling units are sampled using 12 A/D chips, reference voltage 2.5V.
Further, the display unit includes LCD display.
Further, the alarm output unit includes phonic warning, indicator light alarm.
Further, the voltage deviation compensation bridge unit includes adjustable resistance, and voltage deviation compensates bridge unit in direct current system
The positive and negative anodes of system busbar put into adjustable resistance, tie up straight-flow system positive and negative busbar voltage-to-ground by adjusting the resistance value of adjustable resistance
Hold equilibrium state.
The beneficial effects of the utility model are：
The utility model is suitable for the DC power supply system of the different voltages grade such as 220V/110V/48V in substation or power plant
System monitors straight-flow system positive and negative busbar voltage-to-ground, can detect the Bus Voltage range of 0-300V, while basis in real time
The ratio size and system insulation state of positive and negative busbar voltage-to-ground, it is automatic to carry out voltage deviation compensation, make positive and negative busbar over the ground
The ratio of voltage is between 0.95-1.05, i.e., as close as in 1.In this way it is prevented that since ground connection event occurs for system
Barrier, insulation, which reduce, to be caused in DC power system after the offset of positive and negative anodes voltage-to-ground, and causes protective device action, so as to
DC power system is reduced because voltage deviation leads to the risk of false protection, is conducive to the DC power supply for promoting substation or power plant
System operation management level improves substation or electric power factory equipment operational reliability, prevents malfunction, reduce severe and great casualty,
Infusion of financial resources is set to create higher economic benefit and social benefit.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the concrete principle figure of the sampling isolated location of the utility model；
Fig. 3 is the principle schematic of the insulation resistance detection unit of the utility model；
Fig. 4 is that the voltage deviation of the utility model compensates the principle schematic of bridge unit.
Specific implementation mode
In order to be better understood from the utility model, the utility model is made in the following with reference to the drawings and specific embodiments further
Explanation：
As shown in Figure 1, a kind of New insulated monitoring device with voltage compensation includes sampling isolated location, amplification filtering
Unit, AD sampling units, primary processor MCU units, display unit, alarm output unit, storage unit, insulation resistance detection are single
Member, voltage deviation compensate bridge unit；Sampling isolated location is connect with amplification filter unit；Amplify filter unit and AD sampling units
Connection；AD sampling units are connect with primary processor MCU units；Display unit, alarm output unit, storage unit, insulation resistance
Detection unit, voltage deviation compensation bridge unit are connect with primary processor MCU units respectively.
As shown in Fig. 2, sampling isolated location includes partial pressure sampling module, isolation module；It divides sampling module and uses resistance
R1, resistance R2 partial pressures, are sampled using resistance R3；Isolation module includes phototube coupling unit；The phototube coupling unit by every
It is realized from linear optical coupling；
Straight-flow system busbar positive and negative anodes voltage-to-ground signal inputs after resistance R1, resistance R2 partial pressures and resistance R3 samplings
Phototube Coupling is carried out to isolation linear optical coupling, straight-flow system busbar positive and negative anodes voltage-to-ground signal is after partial pressure sampling and isolation
It is input to primary processor MCU units after sequentially inputting to amplification filter unit, the processing of AD sampling units and carries out calculation processing, then is defeated
Enter to display unit, storage unit, when the ratio of primary processor MCU unit judges straight-flow system busbar positive and negative anodes voltage-to-grounds is super
When going out false protection risk factors, primary processor MCU units can start alarm output unit and insulation resistance detection unit, insulation
Resistance detection unit detects the size of straight-flow system busbar positive and negative anodes insulation against ground resistance, and compensates bridge unit by voltage deviation
Straight-flow system positive and negative busbar voltage-to-ground is maintained into equilibrium state.
Wherein, the amplification factor that linear optical coupling is isolated is 8 times.It includes amplifying circuit, filter circuit to amplify filter unit；It puts
Big circuit includes the level-one low-pass amplifier that amplification factor is 1.5 times, and filter circuit is low-pass filter circuit.
AD sampling units are sampled using 12 A/D chips, model TLC2543, reference voltage 2.5V.Therefore 12
The resolution ratio of the AD conversion chip of position is 0.6mV.By selecting rational parameter to divider resistance and amplifying circuit, resistance R1,
R2 parameters are respectively 1000k/1W, 680/0.5W, since isolation linear optical coupling is 8 times of amplification relationships, the times magnification of amplifying circuit
Number is 1.5 times, thus ensure that the Bus Voltage of 300V after processing of circuit at AD sampling units signal it is effective
Peak-to-peak value is not more than 2.5V, calculation formula：300V*0.68/（1000+0.68）*8*1.5=2.446V<2.5V, then according to reason
Think that the signal virtual value of virtual value is 0.1V in the case of ratio AC signal at AD samplings is 0.815mV, calculation formula：
1000*0.1V*2.446V/300V=0.815mV, therefore the d. c. voltage signal of 0V-300V, for the AD that resolution ratio is 0.6mV
It can be captured completely for sampling A/D chip.
Display unit includes LCD display.Alarm output unit includes phonic warning, indicator light alarm.
As shown in figure 3, insulation resistance detection unit includes 2 balance resistor bridge R4,2 switching resistor bridge R5, relays
K1, relay K2, straight-flow system busbar anode insulation against ground resistance R6, straight-flow system busbar cathode insulation against ground resistance R7；Its
Middle balance resistor bridge R4, switching resistor bridge R5 are given value, and straight-flow system busbar anode insulation against ground resistance R6, straight-flow system are female
Line cathode insulation against ground resistance R7 is unknown-value.The operation principle of insulation resistance detection unit is as follows：
1, primary processor MCU units control relay K1, relay K2 are closed at, and can calculate separately out straight-flow system
The size of positive and negative busbar voltage-to-ground is respectively V1, V2, then：
V1/V2=(R4//R5//R6)/(R4//R5//R7)；
2, primary processor MCU units control relay K1 is closed, and relay K2 is disconnected, and can calculate separately out straight-flow system
The size of positive and negative busbar voltage-to-ground is respectively V3, V4, then：
V3/V4=(R4//R5//R6)/(R4//R7)；
3, primary processor MCU units control relay K1 is disconnected, and relay K2 is closed, and can calculate separately out straight-flow system
The size of positive and negative busbar voltage-to-ground is respectively V5, V6, then：
V5/V6=(R4//R6)/(R4//R5//R7)；
According to above formulaWith, wherein V1, V2, V3, V4, V5, V6 are survey calculation amount, are known quantity, R4, R5
For known quantity, R6, R7 are unknown quantity can solve the size of R6, R7 respectively according to the calculation of linear equation in two unknowns group.
According to《DL/T 1392-2014 DC power system insulation monitoring device technical conditions》Requirement：Work as straight-flow system
When the ratio of positive and negative busbar voltage-to-ground exceeds false protection risk factors, i.e. when V1/V2 is more than 1.222 or is less than 0.818,
Device start automatically voltage deviation compensation bridge unit make straight-flow system positive and negative busbar voltage-to-ground be temporarily maintained at one it is relatively flat
Weigh symmetry status.It is specific as follows：
As shown in figure 4, voltage deviation compensation bridge unit includes adjustable resistance R8, adjustable resistance R9, relay K3, relay
K4；Adjustable resistance R8 is connect with straight-flow system positive electrode bus, relay K3 respectively, adjustable resistance R9 respectively with straight-flow system cathode
Busbar, relay K4 connections；Voltage deviation compensates bridge unit and puts into adjustable resistance in the positive and negative anodes of straight-flow system busbar, passes through tune
Straight-flow system positive and negative busbar voltage-to-ground is maintained equilibrium state by the resistance value of whole adjustable resistance.I.e.：
If V1/V2 is more than 1.222, i.e. straight-flow system negative insulation reduces, then primary processor MCU processing units control electricity
It presses the relay K3 of deviation compensation bridge unit to be closed, adjustable resistance R8 is put into straight-flow system busbar anode, and according to adopting in real time
Sample calculates the ratio size of straight-flow system busbar positive and negative anodes voltage-to-ground V1 and V2, and the resistance value of adjustment adjustable resistance R8 outputs makes
Straight-flow system busbar anode voltage-to-ground continuously decreases, and straight-flow system busbar cathode voltage-to-ground gradually rises.Work as straight-flow system
The ratio of positive and negative busbar voltage-to-ground is less than the 1.05 resistance value outputs for stopping adjustment adjustable resistance R8, makes the positive and negative mother of straight-flow system
Line-to-earth voltage is temporarily maintained at a symmetrical state of relative equilibrium, and ratio is close to 1.
If V1/V2 is less than 0.818, i.e. straight-flow system anode insulation reduces, then primary processor MCU processing units control electricity
It presses the relay K4 of deviation compensation bridge unit to be closed, adjustable resistance R9 is put into straight-flow system busbar cathode, and according to adopting in real time
Sample calculates the ratio size of straight-flow system busbar positive and negative anodes voltage-to-ground V1 and V2, and the resistance value of adjustment adjustable resistance R9 outputs makes
Straight-flow system busbar cathode voltage-to-ground continuously decreases, and straight-flow system busbar anode voltage-to-ground gradually rises.Work as straight-flow system
The ratio of positive and negative busbar voltage-to-ground is more than the 0.95 resistance value output for stopping adjustment adjustable resistance R9, makes the positive and negative mother of straight-flow system
Line-to-earth voltage is temporarily maintained at a symmetrical state of relative equilibrium, and ratio is close to 1.After the completion of voltage deviation compensation,
It is compensated and is completed by LCD display display reminding voltage deviation.
Wherein, primary processor MCU Unit selections STM32F407ZGT6 chips, straight-flow system busbar positive and negative anodes voltage-to-ground
After over sampling isolated location, amplification filter unit processing, last AD sampling units are sampled signal, and analog signal is converted
It is supplied to primary processor MCU units to be handled for a series of discrete numerical sequences and calculates DC bus positive and negative anodes over the ground
The virtual value of voltage, if the amount of special change and special change occurs for the voltage value of measurement of front and back moment higher than the warning value of setting, master
Processor MCU unit starting insulation resistance detection units, according to previously described formulaWithCalculate separately out straight-flow system
The size of R6, R7 of busbar positive and negative anodes insulation against ground resistance, and start voltage deviation and compensate bridge unit in straight-flow system busbar
Positive and negative anodes put into adjustable resistance, and straight-flow system positive and negative busbar voltage-to-ground is maintained equilibrium-like by adjusting the resistance value of adjustable resistance
State.
The utility model is not limited to above-described specific implementation mode, and the foregoing is merely the preferable of the utility model
Case study on implementation is not intended to limit the utility model, made within the spirit and principle of the present invention any
Modifications, equivalent substitutions and improvements etc., should be included within the scope of protection of this utility model.
Claims (7)
1. a kind of New insulated monitoring device with voltage compensation, it is characterised in that：
It is defeated including sampling isolated location, amplification filter unit, AD sampling units, primary processor MCU units, display unit, alarm
Go out unit, storage unit, insulation resistance detection unit, voltage deviation compensation bridge unit；The sampling isolated location is filtered with amplification
Wave unit connects；The amplification filter unit is connect with AD sampling units；The AD sampling units connect with primary processor MCU units
It connects；The display unit, alarm output unit, storage unit, insulation resistance detection unit, voltage deviation compensation bridge unit difference
It is connect with primary processor MCU units；
The sampling isolated location includes partial pressure sampling module, isolation module；The partial pressure sampling module is using resistance R1, resistance
R2 is divided, and is sampled using resistance R3；The isolation module includes phototube coupling unit；The phototube coupling unit passes through shielding wire
Property optocoupler realize；
Straight-flow system busbar positive and negative anodes voltage-to-ground signal be input to after resistance R1, resistance R2 partial pressure and resistance R3 samplings every
From linear optical coupling carry out Phototube Coupling, straight-flow system busbar positive and negative anodes voltage-to-ground signal by partial pressure sampling and isolation after successively
It is input to the progress calculation processing of primary processor MCU units after being input to amplification filter unit, the processing of AD sampling units, then is input to
Display unit, storage unit, when the ratio of primary processor MCU unit judges straight-flow system busbar positive and negative anodes voltage-to-grounds is beyond guarantor
When protecting malfunction risk factors, primary processor MCU units can start alarm output unit and insulation resistance detection unit, insulation resistance
Detection unit detects the size of straight-flow system busbar positive and negative anodes insulation against ground resistance, and compensating bridge unit by voltage deviation will be straight
Streaming system positive and negative busbar voltage-to-ground maintains equilibrium state.
2. a kind of New insulated monitoring device with voltage compensation according to claim 1, it is characterised in that：
The amplification factor of the isolation linear optical coupling is 8 times.
3. a kind of New insulated monitoring device with voltage compensation according to claim 1, it is characterised in that：
The amplification filter unit includes amplifying circuit, filter circuit；The amplifying circuit includes one that amplification factor is 1.5 times
Grade low-pass amplifier, the filter circuit are low-pass filter circuit.
4. a kind of New insulated monitoring device with voltage compensation according to claim 1, it is characterised in that：
The AD sampling units are sampled using 12 A/D chips, reference voltage 2.5V.
5. a kind of New insulated monitoring device with voltage compensation according to claim 1, it is characterised in that：
The display unit includes LCD display.
6. a kind of New insulated monitoring device with voltage compensation according to claim 1, it is characterised in that：
The alarm output unit includes phonic warning, indicator light alarm.
7. a kind of New insulated monitoring device with voltage compensation according to claim 1, it is characterised in that：
The voltage deviation compensation bridge unit includes adjustable resistance, and voltage deviation compensates bridge unit in the positive and negative of straight-flow system busbar
Pole puts into adjustable resistance, and straight-flow system positive and negative busbar voltage-to-ground is maintained equilibrium state by adjusting the resistance value of adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721747461.0U CN207623458U (en) | 2017-12-14 | 2017-12-14 | A kind of New insulated monitoring device with voltage compensation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721747461.0U CN207623458U (en) | 2017-12-14 | 2017-12-14 | A kind of New insulated monitoring device with voltage compensation |
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| CN207623458U true CN207623458U (en) | 2018-07-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108987A (en) * | 2019-03-29 | 2019-08-09 | 珠海瑞特电气设备有限公司 | A kind of direct current system electric bridge self-adjusting apparatus |
| CN110581538A (en) * | 2019-06-24 | 2019-12-17 | 中国南方电网有限责任公司超高压输电公司梧州局 | Microcomputer protection device and method based on linear optocoupler |
-
2017
- 2017-12-14 CN CN201721747461.0U patent/CN207623458U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108987A (en) * | 2019-03-29 | 2019-08-09 | 珠海瑞特电气设备有限公司 | A kind of direct current system electric bridge self-adjusting apparatus |
| CN110581538A (en) * | 2019-06-24 | 2019-12-17 | 中国南方电网有限责任公司超高压输电公司梧州局 | Microcomputer protection device and method based on linear optocoupler |
| CN110581538B (en) * | 2019-06-24 | 2020-08-11 | 中国南方电网有限责任公司超高压输电公司梧州局 | Microcomputer protection device and method based on linear optocoupler |
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