CN107132473A - A kind of low-voltage intelligent monitoring terminal - Google Patents
A kind of low-voltage intelligent monitoring terminal Download PDFInfo
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- CN107132473A CN107132473A CN201710348184.4A CN201710348184A CN107132473A CN 107132473 A CN107132473 A CN 107132473A CN 201710348184 A CN201710348184 A CN 201710348184A CN 107132473 A CN107132473 A CN 107132473A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 41
- 230000007935 neutral effect Effects 0.000 claims abstract description 20
- 230000005611 electricity Effects 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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Classifications
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
-
- 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
Abstract
The invention discloses a kind of low-voltage intelligent monitoring terminal, including control circuit, power circuit, electric current selection regulation circuit, switch working state Acquisition Circuit, oil temperature sample circuit, residual current sample circuit, clock circuit, neutral current sample circuit and passive codified output circuit, the electric current selection regulation circuit, switch working state Acquisition Circuit, oil temperature sample circuit, residual current sample circuit, clock circuit, neutral current sample circuit and passive codified output circuit are connected with control circuit, and the power circuit provides power supply for terminal.With Signals collecting functions such as switch working state, oil temperature, residual current, neutral currents, thus reach that integrated level is high and function more than purpose.
Description
Technical field
The present invention relates to terminal work about electric power Condition Monitoring Technology field, more particularly to a kind of low-voltage intelligent monitoring terminal.
Background technology
At present, with the continuous improvement of China's socio-economic development level, the load of low-voltage network is continuously increased, simultaneously
Wretched insufficiency of the low-voltage network in terms of electrical parameter monitoring, on off state monitoring.
But, there is following defect in existing technology：
It is of the prior art the problem of there is low integrated level and single function.
The content of the invention
In order to overcome the deficiencies in the prior art, it is an object of the invention to provide a kind of low-voltage intelligent monitoring terminal, with reality
Advantage more than existing integrated level height and function.
The purpose of the present invention adopts the following technical scheme that realization：
A kind of low-voltage intelligent monitoring terminal, including control circuit, power circuit, electric current selection regulation circuit, switch
State acquisition circuit, oil temperature sample circuit, residual current sample circuit, clock circuit, neutral current sample circuit and it is passive can
Encode output circuit, the electric current selection regulation circuit, switch working state Acquisition Circuit, oil temperature sample circuit, residual current
Sample circuit, clock circuit, neutral current sample circuit and passive codified output circuit are connected with control circuit, the electricity
Source circuit provides power supply for terminal.
Further, in addition to interface circuit, electric current indicating circuit, storage circuit and device id circuit, the interface electricity
Road, electric current indicating circuit, storage circuit and device id circuit are connected with control circuit.
Further, the interface circuit, including RS485 interface circuits and usb circuit, the RS485 interfaces electricity
Series capacitance between road, including MAX485 chips, optocoupler U15, optocoupler U16 and triode Q1, the output end of the optocoupler U15
C27, the electric capacity C27 and resistance R60 are connected between power supply D5V ends and ground terminal, between the electric capacity C27 and resistance R60
Node is connected with control circuit, and the electric capacity C28 is connected between power supply D5V ends and ground terminal, an input of the optocoupler U15
Series resistance R63 between end and power supply P5V ends, series capacitance C31 between power supply P5V ends and ground, the optocoupler U15's is another
Individual input is connected with triode Q1 emitter stage, the grounded collector of the triode Q1, the base stage of the triode Q1 with
The receiver output end connection of MAX485 chips, series resistance between the first input end of the optocoupler U16 and power supply D5V ends
R62, the optocoupler U16 the second input are connected with control circuit, the 3rd input and the power supply D5V ends of the optocoupler U16
Between series resistance R61, the optocoupler U16 the 4th input with control circuit be connected, the first output end of the optocoupler U16
It is connected with the receiver output Enable Pin of MAX485 chips, the receiver of the MAX485 chips exports Enable Pin with stating
The driver output Enable Pin connection of MAX485 chips, the second output head grounding of the optocoupler U16, the of the optocoupler U16
Between one output end and power supply P5V ends series resistance R64, resistance R64 and electric capacity C30 be connected on power supply P5V ends and ground terminal it
Between, resistance R66 and the series circuit that electric capacity C32 is constituted are in parallel with the series circuit that electric capacity C30 is constituted with resistance R64, the light
Series resistance R66 between coupling U16 the 3rd output end and power supply P5V ends, the optocoupler U16 the 3rd output end and MAX485
The driver input end connection of chip, the 4th output head grounding of the optocoupler U16.
Further, the control circuit uses single chip circuit.
Further, the power circuit, including, including transformer T1, rectifier bridge UR1, rectifier bridge UR2, three-terminal voltage-stabilizing
Device U1, three terminal regulator U2, three terminal regulator U3 and common-mode filter L1, the common-mode filter L1 output end and transformer
T1 input connection, the two ends of the first secondary winding of the transformer T1 connect with rectifier bridge UR1 two inputs respectively
Connect, series inductance L2 and electric capacity C4 between two output ends of the rectifier bridge UR1, electric capacity C6 is in parallel with electric capacity C4, the electricity
Hold the node ground connection that C6 is connected with electric capacity C4, the input of node and three terminal regulator U1 between the inductance L2 and electric capacity C4
Connection, the earth terminal ground connection of the three terminal regulator U1, series electrical between the output end and earth terminal of the three terminal regulator U1
Hold C9, electric capacity C11 is in parallel with electric capacity C9, LED 1 is in parallel with electric capacity C11, the negative electrode of LED 1 and
Three terminal regulator U1 earth terminal connection；
The two ends of the second secondary winding of the transformer T1 are connected with rectifier bridge UR2 two inputs respectively, described
Series inductance L3 and electric capacity C5 between rectifier bridge UR2 output end, electric capacity C7 are in parallel with electric capacity C5, the electric capacity C7 and electric capacity
Node ground connection between C5, the node between the inductance L3 and electric capacity C4 is connected with three terminal regulator U2 input, described
Three terminal regulator U2 earth terminal ground connection, series capacitance C8, electric capacity between the output end and earth terminal of the three terminal regulator U2
C10 is in parallel with electric capacity C8, and the input of the three terminal regulator U3 is connected with three terminal regulator U2 output end, and three end is steady
Depressor U3 earth terminal ground connection, series capacitance C12 between the output end and earth terminal of the three terminal regulator U3, electric capacity C13 with
Electric capacity C12 is in parallel.
Further, the switch working state Acquisition Circuit, including common-mode filter L4, transformer T2, diode D1
With voltage-regulator diode DZ1, series capacitance C14 between two inputs of the common-mode filter L4, the common-mode filter L4's
One end series resistance R2 of one output end and transformer T2 first winding, the two ends of the secondary winding of the transformer T2
Between series resistance R3, the diode D1, resistance R4 and voltage-regulator diode DZ1 composition series circuit it is in parallel with resistance R3,
The negative electrode of the diode D1 is connected with resistance R4 one end, the other end of the resistance R4 and voltage-regulator diode DZ1 negative electrode
Connection, the plus earth of the voltage-regulator diode DZ1, electric capacity C33 is in parallel with voltage-regulator diode DZ1.
Further, the oil temperature sample circuit, includes transport and placing device U5B, the transport and placing device U5B in-phase input end and electricity
Series resistance R15, the transport and placing device between series resistance R14 between source, the transport and placing device U5B inverting input and ground
Gone here and there between series resistance R16 between U5B inverting input and output end, the transport and placing device U5B output end and control circuit
Join series capacitance C18 between the node and ground between resistance R17, the resistance R17 and control circuit.
Further, the residual current sample circuit, including common-mode filter L8 and transport and placing device U5A, the common mode filter
The series circuit and resistance R18 that series resistance R18, resistance R20 and electric capacity C19 are constituted between ripple device L8 two output ends are simultaneously
Connection, the node ground connection between the resistance R18 and electric capacity C19, resistance R19, adjustable resistance RP1 and connecting that resistance R22 is constituted
Resistance is in parallel with resistance R18, and the in-phase input end of the transport and placing device U5A is connected with adjustable resistance RP1 adjustable end, the fortune
Put between device U5A inverting input and ground between series resistance R21, the transport and placing device U5A inverting input and output end
Series resistance R24, the resistance R24 and control between series resistance R23, the transport and placing device U5A output end and control circuit
Series capacitance C20 between node and ground between circuit.
Further, the neutral current sample circuit, including transformer T6, common-mode filter L9 and transport and placing device U4A, institute
The input for stating common-mode filter L9 is connected with transformer T6 secondary winding, two output ends of the common-mode filter L9 it
Between series resistance R25, resistance R27 and the series circuit that electric capacity C21 is constituted be in parallel with resistance R25, the resistance R25 and electric capacity
Node ground connection between C21, resistance R26, adjustable resistance RP2 and the series resistance that resistance R29 is constituted are in parallel with resistance R25, institute
Transport and placing device U4A in-phase input end is stated to be connected with adjustable resistance RP2 adjustable end, the inverting input of the transport and placing device U4A with
Series resistance R30, the amplifier between series resistance R28 between ground, the transport and placing device U4A inverting input and output end
Node and ground between device U4A output end and control circuit between series resistance R31, the resistance R31 and control circuit
Between series capacitance C22.
Further, the passive codified output circuit, including optocoupler U6 and LED 2, the optocoupler U6
First input end and power supply D5V ends between series resistance R32, the optocoupler U6 the second input and control circuit between go here and there
Join LED 2, the anode of the LED 2 is connected with optocoupler U6, and the output end of the optocoupler U6 is with connecing
Terminal is connected.
Compared with prior art, the beneficial effects of the present invention are：
The technical program integrates a variety of functional circuits, with switch working state, oil temperature, residual current, in
Property the Signals collecting function such as electric current so that reach that integrated level is high and function more than purpose.
Brief description of the drawings
Fig. 1 is the electrical schematic diagram of invention low-voltage intelligent monitoring terminal；
Fig. 2 is the electronic circuitry of power circuit in invention low-voltage intelligent monitoring terminal；
Fig. 3 is the electronic circuitry of electric current selection regulation circuit in invention low-voltage intelligent monitoring terminal；
Fig. 4 a-4d are the electronic circuitry of switch working state Acquisition Circuit in invention low-voltage intelligent monitoring terminal；
Fig. 5 is the electronic circuitry of oil temperature sample circuit in invention low-voltage intelligent monitoring terminal；
Fig. 6 is the electronic circuitry of residual current sample circuit in invention low-voltage intelligent monitoring terminal；
Fig. 7 is the electronic circuitry of neutral current sample circuit in invention low-voltage intelligent monitoring terminal；
Fig. 8 is the electronic circuitry of electric current indicating circuit in invention low-voltage intelligent monitoring terminal；
Fig. 9 is the electronic circuitry of clock circuit in invention low-voltage intelligent monitoring terminal；
Figure 10 is the electronic circuitry of storage circuit in invention low-voltage intelligent monitoring terminal；
Figure 11 is the electronic circuitry of device id circuit in invention low-voltage intelligent monitoring terminal；
Figure 12 is the electronic circuitry of single chip circuit in invention low-voltage intelligent monitoring terminal；
Figure 13 a-13e are the electronic circuitry of passive codified output circuit in invention low-voltage intelligent monitoring terminal；
Figure 14 is the electronic circuitry of RS485 interface circuits in invention low-voltage intelligent monitoring terminal；
Figure 15 a-15b are the electronic circuitry of usb circuit in invention low-voltage intelligent monitoring terminal；
Figure 16 is the external structure of invention low-voltage intelligent monitoring terminal；
Figure 17 is the use of invention low-voltage intelligent monitoring terminal with reference to figure.
In figure：1st, distribution transforming oil temperature PT100 interfaces；2nd, residual current measurement interface；3rd, neutral current measurement interface；4th, it is remaining
Current threshold is selected；5th, neutral current threshold values is selected.
Embodiment
Below, with reference to accompanying drawing and embodiment, the present invention is described further, it is necessary to which explanation is, not
Under the premise of afoul, new implementation can be formed between various embodiments described below or between each technical characteristic in any combination
Example.
As shown in figure 1, a kind of low-voltage intelligent monitoring terminal, including control circuit, power circuit, electric current selection regulation electricity
Road, switch working state Acquisition Circuit, oil temperature sample circuit, residual current sample circuit, clock circuit, neutral current sampling electricity
Road and passive codified output circuit, it is electric current selection regulation circuit, switch working state Acquisition Circuit, oil temperature sample circuit, surplus
Aftercurrent sample circuit, clock circuit, neutral current sample circuit and passive codified output circuit are connected with control circuit,
Power circuit provides power supply for terminal.
In further embodiment, terminal also includes interface circuit, electric current indicating circuit, storage circuit and device id electricity
Road, interface circuit, electric current indicating circuit, storage circuit and device id circuit are connected with control circuit.
In further embodiment, interface circuit as shown in Figure 14, Figure 15 a and Figure 15 b, including RS485 interface circuits and
Usb circuit, RS485 interface circuits are as shown in figure 14, including MAX485 chips, optocoupler U15, optocoupler U16 and triode Q1,
Series capacitance C27 between optocoupler U15 output end, electric capacity C27 and resistance R60 are connected between power supply D5V ends and ground terminal, electricity
The node held between C27 and resistance R60 is connected with control circuit, and electric capacity C28 is connected between power supply D5V ends and ground terminal, optocoupler
Series resistance R63, series capacitance C31, optocoupler between power supply P5V ends and ground between a U15 input and power supply P5V ends
U15 another input is connected with triode Q1 emitter stage, triode Q1 grounded collector, triode Q1 base stage with
The receiver output end connection of MAX485 chips, series resistance R62, light between optocoupler U16 first input end and power supply D5V ends
Coupling U16 the second input is connected with control circuit, series resistance between optocoupler U16 the 3rd input and power supply D5V ends
R61, optocoupler U16 the 4th input are connected with control circuit, optocoupler U16 the first output end and the receiver of MAX485 chips
Enable Pin connection is exported, the receiver output Enable Pin of MAX485 chips connects with stating the driver output Enable Pin of MAX485 chips
Connect, optocoupler U16 the second output head grounding, series resistance R64, resistance between optocoupler U16 the first output end and power supply P5V ends
R64 and electric capacity C30 are connected between power supply P5V ends and ground terminal, series circuit and resistance that resistance R66 and electric capacity C32 is constituted
R64 is in parallel with the series circuit that electric capacity C30 is constituted, series resistance R66 between optocoupler U16 the 3rd output end and power supply P5V ends,
Optocoupler U16 the 3rd output end is connected with the driver input end of MAX485 chips, optocoupler U16 the 4th output head grounding.
In further embodiment, as shown in figure 12, control circuit uses single chip circuit.
In further embodiment, as shown in Fig. 2 power circuit, including, including transformer T1, rectifier bridge UR1, rectification
Bridge UR2, three terminal regulator U1, three terminal regulator U2, three terminal regulator U3 and common-mode filter L1, common-mode filter L1 output
End is connected with transformer T1 input, and the two ends of transformer T1 the first secondary winding are defeated with two of rectifier bridge UR1 respectively
Enter series inductance L2 and electric capacity C4 between end connection, rectifier bridge UR1 two output ends, electric capacity C6 is in parallel with electric capacity C4, electric capacity
The node ground connection that C6 is connected with electric capacity C4, the node between inductance L2 and electric capacity C4 is connected with three terminal regulator U1 input,
Three terminal regulator U1 earth terminal ground connection, series capacitance C9 between three terminal regulator U1 output end and earth terminal, electric capacity C11 with
Electric capacity C9 is in parallel, and LED 1 is in parallel with electric capacity C11, the negative electrode of LED 1 and connecing for three terminal regulator U1
Ground terminal is connected；
The two ends of transformer T1 the second secondary winding are connected with rectifier bridge UR2 two inputs respectively, rectifier bridge UR2
Output end between series inductance L3 and electric capacity C5, electric capacity C7 is in parallel with electric capacity C5, and the node between electric capacity C7 and electric capacity C5 connects
Ground, the node between inductance L3 and electric capacity C4 is connected with three terminal regulator U2 input, three terminal regulator U2 ground connection termination
Ground, series capacitance C8 between three terminal regulator U2 output end and earth terminal, electric capacity C10 is in parallel with electric capacity C8, three terminal regulator
U3 input is connected with three terminal regulator U2 output end, three terminal regulator U3 earth terminal ground connection, three terminal regulator U3's
Series capacitance C12 between output end and earth terminal, electric capacity C13 is in parallel with electric capacity C12.
In further embodiment, as shown in fig. 4 a, switch working state Acquisition Circuit, including common-mode filter L4, change
Series capacitance C14, common mode filtering between depressor T2, diode D1 and voltage-regulator diode DZ1, common-mode filter L4 two inputs
One end series resistance R2 of a device L4 output end and transformer T2 first winding, the two ends of transformer T2 secondary winding
Between series resistance R3, diode D1, resistance R4 and voltage-regulator diode DZ1 composition series circuit it is in parallel with resistance R3, two poles
Pipe D1 negative electrode is connected with resistance R4 one end, and the resistance R4 other end is connected with voltage-regulator diode DZ1 negative electrode, the pole of voltage stabilizing two
Pipe DZ1 plus earth, electric capacity C33 is in parallel with voltage-regulator diode DZ1.
Switch working state Acquisition Circuit has 4 tunnels, and the circuit diagram on other 3 tunnels is as shown in Fig. 4 b, Fig. 4 c and Fig. 4 d.
In further embodiment, as shown in figure 5, oil temperature sample circuit, includes transport and placing device U5B, transport and placing device U5B same phase
Series resistance R15, transport and placing device between series resistance R14 between input and power end, transport and placing device U5B inverting input and ground
Series electrical between series resistance R16 between U5B inverting input and output end, transport and placing device U5B output end and control circuit
R17 is hindered, series capacitance C18 between the node and ground between resistance R17 and control circuit.
In further embodiment, as shown in fig. 6, residual current sample circuit, including common-mode filter L8 and transport and placing device
Between U5A, common-mode filter L8 two output ends series resistance R18, resistance R20 and electric capacity C19 constitute series circuit with
Resistance R18 parallel connections, the node ground connection between resistance R18 and electric capacity C19, resistance R19, adjustable resistance RP1 and resistance R22 compositions
Series resistance is in parallel with resistance R18, and transport and placing device U5A in-phase input end is connected with adjustable resistance RP1 adjustable end, transport and placing device
Series resistance between series resistance R21 between U5A inverting input and ground, transport and placing device U5A inverting input and output end
Node between series resistance R24 between R23, transport and placing device U5A output end and control circuit, resistance R24 and control circuit with
Series capacitance C20 between ground.
In further embodiment, as shown in fig. 7, neutral current sample circuit, including transformer T6, common-mode filter L9
With transport and placing device U4A, common-mode filter L9 input is connected with transformer T6 secondary winding, and two of common-mode filter L9 are defeated
Go out series resistance R25 between end, resistance R27 and the series circuit that electric capacity C21 is constituted are in parallel with resistance R25, resistance R25 and electricity
Hold the node ground connection between C21, resistance R26, adjustable resistance RP2 and the series resistance that resistance R29 is constituted are in parallel with resistance R25,
Transport and placing device U4A in-phase input end is connected with adjustable resistance RP2 adjustable end, between transport and placing device U4A inverting input and ground
Series resistance R30 between series resistance R28, transport and placing device U4A inverting input and output end, transport and placing device U4A output end with
Series resistance R31 between circuit is controlled, series capacitance C22 between the node and ground between resistance R31 and control circuit.
In further embodiment, as depicted in fig. 13 a, passive codified output circuit, including optocoupler U6 and light-emitting diodes
Series resistance R32 between pipe LED2, optocoupler U6 first input end and power supply D5V ends, optocoupler U6 the second input and control
Connected between circuit LED 2, the anode of LED 2 is connected with optocoupler U6, optocoupler U6 output end and
Binding post is connected.
Passive codified output circuit has 5 tunnels, other passive codified output circuit such as Figure 13 b in 4 tunnel, Figure 13 c, Figure 13 d
With shown in Figure 13 e.
In terminal, electric current indicating circuit as shown in figure 8, clock circuit as shown in figure 9, storage circuit as shown in Figure 10, if
Standby ID circuits are as shown in figure 11.
In the technical program, in order to prevent the generation of power transmission sequence broken string and electric leakage electric shock accident, a kind of configuration is proposed
The low-voltage network intelligence of a variety of external interfaces such as RS485, USB (internal reservation TD-LTE, FDD-LTE/4G mixed-media network modules mixed-media interface)
Can monitoring terminal.This terminal is exportable to work out 4 16 kinds of working conditions of way switch amount signal designation, to residual current and neutrality
Effective monitoring of current measurement, on off state and distribution transformer oil temperature, it is intended to provide reliable electricity for China's expanding economy
Try hard to keep barrier.
The terminal of the technical program be based on the Distribution transformer of new generation developed under embedded software hardware development platform,
Integrated level is high, advanced technology, and powerful, using RS485, USB, (internal reservation TD-LTE, FDD-LTE/4G mixed-media network modules mixed-media connects
Mouthful) etc. a variety of external interface communication modes, possess 3 road analog signalses samplings, the collection of 4 way switch working conditions, and 4 tunnels of output
Passive optocoupler can work out on-off model, and total current size can be sentenced using signal lamp away from.
Alternating current 220V is transformed into a direct current 9V voltages with power circuit and two-way direct current 5V voltages are carried to other each circuits
For stable operating voltage.(5A/10mA, inductance collar aperture is straight for the external open-close type residual current transformer of residual current measurement port 2
Footpath 45), the ground wire of transformer passes through transformer collar aperture.Neutral current measures the external open-close type neutral current transformer of interface 3
(1000A/5A, inductive loop bore dia 65m), the zero line of transformer passes through transformer collar aperture.Distribution transforming oil temperature PT100 interfaces 1 can be with
It is connected to existing temperature sensor on transformer.Four-way switch working condition Acquisition Circuit connects No. 1 master switch respectively and 3 tunnel branches are opened
Close, any one phase of output switching terminal and zero line are led into low-voltage intelligent monitoring terminal.Passive codified output circuit can connect negative
Lotus management terminal.As shown in figure 16.
Residual current threshold values selection 4 can be set to third gear by residual current initialization circuit：Low grade (100mA~1000mA
It is adjustable), middle-grade (1100mA~2000mA is adjustable), high-grade (2100mA~3000mA is adjustable).Third gear is respectively with three rotation waves
Duan Kaiguan, each band switch can ten threshold values (100mA~3000mA) of independent setting it is adjustable.When residual current circuit prison
1 corresponding instruction is sent by output circuit when measuring more than threshold values.
Neutral current sets indicating circuit and neutral current threshold values selection 5 is set into two grades, low-grade (50A~400A is adjustable)
(amber light flash caution), high-grade (450A~800A is adjustable) (blinking red lamp warning).Two grades rotate band switches with two respectively,
Each band switch can eight threshold values of independent setting (50A~800A is adjustable).When neutral current circuit is monitored more than threshold values
Instruction accordingly that when passes through output circuit transmission 1 time.When switch working state Acquisition Circuit often measures switch state, open
(obtaining electric) or close (dead electricity) corresponding instruction of transmission respectively.
Oil temperature sample circuit monitors the oil temperature of distribution transformer, is divided into low-grade (85 DEG C) and top grade (105 DEG C), whenever overflowing
1 corresponding instruction of hair.
Often send after 1 subfunction order, be returned to reset state.It is lasting 1 second/time to send order output time,
According to priority not sequentially.
Circuit embedded system is controlled, real-time operation disposal ability is strong.Equipment is stable and reliable in work, in the case of power down
Also data will not be lost.Integrated level is high, advanced technology, powerful.
Modularized design, interface is perfect, using a variety of external interface communication modes such as RS485, USB, internal reservation TD-
LTE, FDD-LTE/4G mixed-media network modules mixed-media interface, it is convenient to extend later.
Using high accuracy not power down real-time clock module.
It is main switch that the use of low-voltage intelligent monitoring terminal switchs K1 as shown in figure 17, in figure, switchs K2, switch K3 and opens
Pass K4 is switch-dividing.
Miniaturization Design, external form is compact attractive in appearance, installs easy maintenance.
Above-mentioned embodiment is only the preferred embodiment of the present invention, it is impossible to limit the scope of protection of the invention with this,
The change and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed scope.
Claims (10)
1. a kind of low-voltage intelligent monitoring terminal, including control circuit, power circuit, electric current selection regulation circuit, switch shape
State Acquisition Circuit, oil temperature sample circuit, residual current sample circuit, clock circuit, neutral current sample circuit and passive compile
Code output circuit, it is characterised in that：Electric current selection regulation circuit, switch working state Acquisition Circuit, oil temperature sample circuit,
Residual current sample circuit, clock circuit, neutral current sample circuit and passive codified output circuit connect with control circuit
Connect, the power circuit provides power supply for terminal.
2. low-voltage intelligent monitoring terminal as claimed in claim 1, it is characterised in that：Also include interface circuit, electric current and indicate electricity
Road, storage circuit and device id circuit, the interface circuit, electric current indicating circuit, storage circuit and device id circuit with control
Circuit connection processed.
3. low-voltage intelligent monitoring terminal as claimed in claim 2, it is characterised in that：The interface circuit, including RS485 interfaces
Circuit and usb circuit, the RS485 interface circuits, including MAX485 chips, optocoupler U15, optocoupler U16 and triode Q1,
Series capacitance C27 between the output end of the optocoupler U15, the electric capacity C27 and resistance R60 are connected on power supply D5V ends and ground terminal
Between, the node between the electric capacity C27 and resistance R60 is connected with control circuit, and the electric capacity C28 is connected on power supply D5V ends
Between ground terminal, series resistance R63 between an input of the optocoupler U15 and power supply P5V ends, power supply P5V ends and ground
Between series capacitance C31, another input of the optocoupler U15 is connected with triode Q1 emitter stage, the triode Q1's
Grounded collector, the base stage of the triode Q1 is connected with the receiver output end of MAX485 chips, and the first of the optocoupler U16
Series resistance R62 between input and power supply D5V ends, the optocoupler U16 the second input are connected with control circuit, the light
Series resistance R61 between coupling U16 the 3rd input and power supply D5V ends, the optocoupler U16 the 4th input and control circuit
Connection, the first output end of the optocoupler U16 is connected with the receiver output Enable Pin of MAX485 chips, the MAX485 chips
Receiver output Enable Pin and state MAX485 chips driver output Enable Pin be connected, the optocoupler U16 second export
End ground connection, series resistance R64 between the first output end of the optocoupler U16 and power supply P5V ends, resistance R64 connects with electric capacity C30
Between power supply P5V ends and ground terminal, the series circuit that resistance R66 and electric capacity C32 is constituted is constituted with resistance R64 and electric capacity C30
Series circuit is in parallel, series resistance R66 between the 3rd output end of the optocoupler U16 and power supply P5V ends, the optocoupler U16's
3rd output end is connected with the driver input end of MAX485 chips, the 4th output head grounding of the optocoupler U16.
4. the low-voltage intelligent monitoring terminal as described in claim 1,2 or 3, it is characterised in that：The control circuit uses monolithic
Electromechanical road.
5. low-voltage intelligent monitoring terminal as claimed in claim 4, it is characterised in that：The power circuit, including, including transformation
Device T1, rectifier bridge UR1, rectifier bridge UR2, three terminal regulator U1, three terminal regulator U2, three terminal regulator U3 and common-mode filter
L1, the output end of the common-mode filter L1 is connected with transformer T1 input, the first secondary winding of the transformer T1
Two ends be connected respectively with rectifier bridge UR1 two inputs, series inductance L2 between two output ends of the rectifier bridge UR1
With electric capacity C4, electric capacity C6 is in parallel with electric capacity C4, the node ground connection that the electric capacity C6 is connected with electric capacity C4, the inductance L2 and electric capacity
Node between C4 is connected with three terminal regulator U1 input, the earth terminal ground connection of the three terminal regulator U1, three end
Series capacitance C9 between voltage-stablizer U1 output end and earth terminal, electric capacity C11 are in parallel with electric capacity C9, LED 1 and electricity
Hold C11 in parallel, the negative electrode of LED 1 is connected with three terminal regulator U1 earth terminal；
The two ends of the second secondary winding of the transformer T1 are connected with rectifier bridge UR2 two inputs respectively, the rectification
Series inductance L3 and electric capacity C5 between bridge UR2 output end, electric capacity C7 are in parallel with electric capacity C5, between the electric capacity C7 and electric capacity C5
Node ground connection, the node between the inductance L3 and electric capacity C4 is connected with three terminal regulator U2 input, and three end is steady
Depressor U2 earth terminal ground connection, series capacitance C8 between the output end and earth terminal of the three terminal regulator U2, electric capacity C10 and electricity
Hold C8 in parallel, the input of the three terminal regulator U3 is connected with three terminal regulator U2 output end, the three terminal regulator U3
Earth terminal ground connection, series capacitance C12, electric capacity C13 and electric capacity C12 between the output end and earth terminal of the three terminal regulator U3
It is in parallel.
6. low-voltage intelligent monitoring terminal as claimed in claim 4, it is characterised in that：The switch working state Acquisition Circuit,
Including common-mode filter L4, transformer T2, diode D1 and voltage-regulator diode DZ1, two inputs of the common-mode filter L4
Between series capacitance C14, the common-mode filter L4 an output end and transformer T2 first winding one end series electrical
Hinder series resistance R3, the diode D1, resistance R4 and the pole of voltage stabilizing two between R2, the two ends of the secondary winding of the transformer T2
The series circuit of pipe DZ1 compositions is in parallel with resistance R3, and the negative electrode of the diode D1 is connected with resistance R4 one end, the resistance
The R4 other end is connected with voltage-regulator diode DZ1 negative electrode, the plus earth of the voltage-regulator diode DZ1, electric capacity C33 and voltage stabilizing
Diode DZ1 is in parallel.
7. low-voltage intelligent monitoring terminal as claimed in claim 4, it is characterised in that：The oil temperature sample circuit, including amplifier
Series resistance R14 between device U5B, the transport and placing device U5B in-phase input end and power end, the transport and placing device U5B's is anti-phase defeated
Enter between end and ground series resistance R16 between series resistance R15, the transport and placing device U5B inverting input and output end, it is described
Node between transport and placing device U5B output end and control circuit between series resistance R17, the resistance R17 and control circuit with
Series capacitance C18 between ground.
8. low-voltage intelligent monitoring terminal as claimed in claim 4, it is characterised in that：The residual current sample circuit, including
Series resistance R18 between common-mode filter L8 and transport and placing device U5A, the common-mode filter L8 two output ends, resistance R20 with
The series circuit of electric capacity C19 compositions is in parallel with resistance R18, the node ground connection between the resistance R18 and electric capacity C19, resistance
R19, adjustable resistance RP1 and the series resistance that resistance R22 is constituted are in parallel with resistance R18, the in-phase input end of the transport and placing device U5A
It is connected with adjustable resistance RP1 adjustable end, series resistance R21, described between the inverting input and ground of the transport and placing device U5A
Series resistance R23 between transport and placing device U5A inverting input and output end, the transport and placing device U5A output end and control circuit
Between series resistance R24, the resistance R24 and control circuit between node and ground between series capacitance C20.
9. low-voltage intelligent monitoring terminal as claimed in claim 4, it is characterised in that：The neutral current sample circuit, including
Transformer T6, common-mode filter L9 and transport and placing device U4A, the input of the common-mode filter L9 and transformer T6 secondary winding
The series electrical that series resistance R25, resistance R27 and electric capacity C21 are constituted between connection, two output ends of the common-mode filter L9
Road is in parallel with resistance R25, the node ground connection between the resistance R25 and electric capacity C21, resistance R26, adjustable resistance RP2 and resistance
The series resistance of R29 compositions is in parallel with resistance R25, the in-phase input end of the transport and placing device U4A and adjustable resistance RP2 adjustable end
Connection, series resistance R28 between the inverting input and ground of the transport and placing device U4A, the inverting input of the transport and placing device U4A with
Series resistance R31, the resistance between series resistance R30 between output end, the transport and placing device U4A output end and control circuit
Series capacitance C22 between node and ground between R31 and control circuit.
10. low-voltage intelligent monitoring terminal as claimed in claim 4, it is characterised in that：The passive codified output circuit, bag
Include optocoupler U6 and LED 2, series resistance R32, institute between the first input end of the optocoupler U6 and power supply D5V ends
State connected between optocoupler U6 the second input and control circuit LED 2, the anode of the LED 2
It is connected with optocoupler U6, the output end of the optocoupler U6 is connected with binding post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710348184.4A CN107132473A (en) | 2017-05-17 | 2017-05-17 | A kind of low-voltage intelligent monitoring terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710348184.4A CN107132473A (en) | 2017-05-17 | 2017-05-17 | A kind of low-voltage intelligent monitoring terminal |
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| Publication Number | Publication Date |
|---|---|
| CN107132473A true CN107132473A (en) | 2017-09-05 |
Family
ID=59732274
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710348184.4A Pending CN107132473A (en) | 2017-05-17 | 2017-05-17 | A kind of low-voltage intelligent monitoring terminal |
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Application publication date: 20170905 |