CN206321768U - A kind of low voltage motor winding insulation comprehensive monitor - Google Patents
A kind of low voltage motor winding insulation comprehensive monitor Download PDFInfo
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- CN206321768U CN206321768U CN201720007087.4U CN201720007087U CN206321768U CN 206321768 U CN206321768 U CN 206321768U CN 201720007087 U CN201720007087 U CN 201720007087U CN 206321768 U CN206321768 U CN 206321768U
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- 238000009413 insulation Methods 0.000 title claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 84
- 238000005070 sampling Methods 0.000 claims abstract description 23
- 230000005611 electricity Effects 0.000 claims description 15
- 239000004519 grease Substances 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 description 12
- 230000009471 action Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
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- 230000008901 benefit Effects 0.000 description 2
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- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 208000005156 Dehydration Diseases 0.000 description 1
- 206010034133 Pathogen resistance Diseases 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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Abstract
The utility model discloses a kind of low voltage motor winding insulation comprehensive monitor, including SCM system, and the temperature sampling amplifying unit being connected with SCM system, water inlet amplifier unit, zero-sequence current input block, online insulaion resistance input block, display module and Keysheet module, temperature sampling amplifying unit includes three road temperature sampling amplifying circuits, three road temperature sampling amplifying circuits gather three windings or bearing temperature of electric pump by temperature sensor respectively, amplifier unit of intaking includes three tunnels water inlet amplifier circuit and all the way environment water level amplifier circuit, zero-sequence current input block includes a zero sequence current mutual inductor, online insulaion resistance input block includes 3~M motor (3 phase ac motor M).The utility model effectively prevents the unexpected generation and expansion of accident, bottoms out loss.
Description
Technical field
The utility model is related to electric pump intelligent controller technical field, more specifically, more particularly to a kind of low voltage motor
Winding insulation comprehensive monitor.
Background technology
Current city is drained off floodwaters water drainage, the Large diving pump required for large-scale power station and reservoir drainage diversion and large pumping station
More and more, because its position is important, and such immersible pump cost is higher (typically 1,000,000 or so or higher), maintenance complicated week
Phase is long, thus to the safeguard measure of pump also more and more higher, it is necessary to protection point it is also a lot.
However, low pressure large diving motor electric pump is likely to occur machine winding overtemperature (1 winding), axle in the process of running
Hold overtemperature (2 bearings up and down), motor cavity leak, grease chamber water inlet, terminal box water inlet, bad border water level water shortage, machine winding exhausted
The failure such as edge value declines, zero-sequence current value is excessive in motor operation, have impact on the normal operation of immersible pump, or even generation thing occur
Therefore.For this reason, it is necessary to design a kind of suitable electric moter voltage in 380v, 660v, power of motor is more than more than 300kw, while can be with
Three tunnel temperature, three tunnel leaks and external environment water level detecting all the way are carried out, all the way machine winding insulation values on-line checking, all the way motor
Zero-sequence current value is detected in operation, and the extremely strong low voltage motor winding insulation comprehensive monitor of antijamming capability.
Utility model content
The purpose of this utility model is to provide a kind of three tunnel temperature of progress, three tunnel leaks and external environment water level inspection all the way
Survey, all the way machine winding insulation values on-line checking, the low voltage motor winding insulation that zero-sequence current value is detected in motor operation all the way
Comprehensive monitor.
In order to achieve the above object, the technical solution adopted in the utility model is as follows：
A kind of low voltage motor winding insulation comprehensive monitor, including SCM system, and be connected with SCM system
Temperature sampling amplifying unit, water inlet amplifier unit, zero-sequence current input block, online insulaion resistance input block, display
Module and Keysheet module, the temperature sampling amplifying unit include three road temperature sampling amplifying circuits, three road temperature sampling amplifications
Circuit gathers three winding temperatures or bearing temperature of electric pump, the water inlet amplifier unit bag by temperature sensor respectively
Three tunnels water inlet amplifier circuit and all the way environment water level amplifier circuit are included, three tunnel water inlet amplifier circuit leads to respectively
Cross the leak of water inlet detecting element collection motor cavity, grease chamber water inlet and terminal box water inlet signal, environment water level amplifier electricity
Road gathers ambient water water level signal.
The online insulaion resistance input block is connected with three phase alternating current motor, online insulaion resistance input block
DC500V voltages occur end and are connected by a cable with motor A/B/C again by motor housing and the connection of instrumentation grounding end
A closed loop detection unit is formed, machine winding insulation against ground resistance value is detected；The zero-sequence current input block includes zero sequence
Current transformer, the zero sequence leakage current value of zero sequence current mutual inductor detection motor in operation.
Further, the environment water level amplifier circuit include resistance R41, resistance R46, resistance R54, resistance R86,
Electric capacity C31, electric capacity C54, voltage-regulator diode D16, follower U11A；Wherein, voltage-regulator diode D16 plus earth, voltage stabilizing two
Pole pipe D16 negative electrode after resistance R54 with follower U11A input anode by being connected, electric capacity C31 and voltage-regulator diode D16
Parallel connection, resistance R41 one end is connected between diode D16 negative electrode and resistance R54, and the resistance R41 other ends are adopted with environment water level
Sample amplifying circuit signal input part is connected, and resistance R46 one end ground connection, the input of the resistance R46 other ends and follower U11A is rectified
Pole is connected, and follower U11A input cathode is connected with its output end, and follower U11A output end passes sequentially through resistance
It is grounded after R86, electric capacity C54.
Further, the circuit structure phase of water inlet the amplifier circuit and the environment water level amplifier circuit
Together.
Further, the online insulaion resistance input block is connected with the terminal of instrument the 16th and motor B phase lines, instrument
15 terminals and the connection of motor housing geodesic；The zero-sequence current input block includes zero sequence current mutual inductor, the instrument the
25th, the 26th terminal is connected with zero sequence current mutual inductor output line respectively.
Further, temperature sampling amplifying circuit include resistance R12, resistance R16, resistance R18, resistance R22, resistance R23,
Resistance R33, resistance R34, resistance R35, resistance R72, electric capacity C21, electric capacity C43, diode D12 and amplifier U10A, wherein, electricity
R18 one end ground connection is hindered, the other end is connected after passing sequentially through resistance R22, resistance R23 with amplifier U10A input cathode, electricity
Resistance R16 one end is connected between resistance R22 and resistance R23, and the other end is connected with+2.5V voltages, and resistance R12 is connected to amplifier
Between U10A input cathode and output end, amplifier U10A output end passes sequentially through resistance R72 and electric capacity C43 is followed by
Ground, diode D12 plus earth, diode D12 negative electrode is connected by the input anode after resistance R30 with amplifier U10A
Connect, electric capacity C21 is in parallel with diode D12, diode D12 negative electrode is also connected with resistance R33 one end, the connection of resistance R34 one end
In diode D12 negative electrode, the other end is connected with+2.5V voltages, and resistance R35 one end connection amplifier U10A input is rectified
Pole, other end ground connection.
Further, the SCM system is also connected with RS485 communicating circuits, the communicating circuit include optocoupler U3,
Optocoupler U5, optocoupler U7, transceiver U4, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance
R10, diode D4, diode D5, electric capacity C6；Wherein optocoupler U3 1 pin is connected by R3 with+3.3V voltages, optocoupler U3 2 pin
Ground connection, optocoupler U3 3 pin are connected by 1 pin after resistance R4 with transceiver U4, and optocoupler U3 4 pin are connected with input power；Light
Coupling U5 1 pin is connected with+3.3V voltages, and optocoupler U5 2 pin are connected with resistance R7 one end, optocoupler U5 3 pin ground connection, optocoupler U5
4 pin be connected by resistance R5 with input power, 2 pin also with transceiver U4 of optocoupler U5 4 pin, 3 pin are connected；The 1 of optocoupler U7
Pin is connected with+3.3V voltages, and optocoupler U7 2 pin are connected with resistance R10 one end, optocoupler U7 3 pin ground connection, optocoupler U7 4 pin
It is connected by resistance R9 with input power, optocoupler U7 4 pin are also connected with transceiver U4 4 pin；Transceiver U4 5 pin ground connection,
Transceiver U4 6 pin passed sequentially through and be grounded after resistance R8, diode D5, and transceiver U4 7 pin pass sequentially through resistance R6, diode
It is grounded after D4, transceiver U4 8 pin are connected with input power, and transceiver U4 8 pin also pass through ground connection after electric capacity C6.
Further, the benchmark negative electricity volt circuit include direct current transducer U17, resistance R57, resistance R78, resistance R81,
Electric capacity C48, electric capacity C49, electric capacity C50, electric capacity C51, diode D29, triode Q6, inductance L1；Input power is changed with direct current
Device U17 1 pin, 6 pin, 7 pin, the connection of 8 pin, direct current transducer U17 2 pin by being grounded after inductance L1, direct current transducer U17's
2 pin after diode D29 with -3.3V voltages by being connected, and direct current transducer U17 3 pin are connected by electric capacity C48 and -3.3V voltages
Connect, direct current transducer U17 4 pin are connected with -3.3V voltages, and -3.3V voltages, by being grounded after electric capacity C50, -3.3V voltages lead to
Cross after electric capacity C51 and be grounded, direct current transducer U17 4 pin are also connected by resistance R78 with direct current transducer U17 5 pin, direct current
Converter U17 5 pin after resistance R57 by being grounded, and direct current transducer U17 6 pin after electric capacity C49 by being grounded, triode Q6
Emitter stage be connected with input power, triode Q6 colelctor electrode is connected with direct current transducer U17 2 pin, triode Q6 base
Pole after resistance R81 by exporting.
Further, intake for grease chamber and the water inlet detecting element of terminal box water inlet is water resistance, for motor cavity
The water inlet detecting element of leak is switch.
Further, the model STM8S207R8T6 of the SCM system.
Further, the SCM system is also associated with alarm output unit.
Compared with prior art, the utility model has the advantage of：1st, the utility model is adapted to low pressure (380v, 660v) greatly
The detection of power (more than 300kw motors electric pump) submersible motor electric pump, monitoring；2nd, the utility model amplifies single by temperature sampling
The tunnel temperature of Yuan Dui tri- is detected that amplifier unit is detected to three road water leakages by intaking, and to environment water level
Signal is detected that including DC500V voltages generation end by online insulaion resistance input block passes through a cable and motor
A/B/C is connected and connect to form a closed loop detection unit by motor housing and instrumentation grounding end again, detects machine winding pair
Ground insulating resistance value, includes zero sequence current mutual inductor by zero-sequence current input block and detects that the zero sequence of motor in operation is leaked electricity
Flow valuve, effectively solve electric pump be likely to occur in the process of running machine winding overtemperature, motor cavity leak, grease chamber water inlet,
Terminal box water inlet, environment water level is too low, machine winding insulating resistance value declines, zero-sequence current value is excessive etc. former in operation for motor
Barrier, effectively prevents the unexpected generation and expansion of accident, bottoms out loss.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the frame diagram of low voltage motor winding insulation comprehensive monitor described in the utility model.
Fig. 2 is the circuit diagram of SCM system in low voltage motor winding insulation comprehensive monitor described in the utility model.
Fig. 3 is environment water level amplifier circuit in low voltage motor winding insulation comprehensive monitor described in the utility model
Circuit diagram.
Fig. 4 be in low voltage motor winding insulation comprehensive monitor described in the utility model with the external connection signal input of motor
The circuit diagram of circuit.
Fig. 5 is the circuit of temperature sampling amplifying circuit in low voltage motor winding insulation comprehensive monitor described in the utility model
Figure.
Fig. 6 is the circuit diagram of RS485 communicating circuits in low voltage motor winding insulation comprehensive monitor described in the utility model.
Fig. 7 is the circuit of benchmark negative electricity volt circuit in low voltage motor winding insulation comprehensive monitor described in the utility model
Figure.
Fig. 8 is the signal of the binding post of instrument in low voltage motor winding insulation comprehensive monitor described in the utility model
Figure.
Embodiment
Preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings, so that advantage of the present utility model
It can be easier to be readily appreciated by one skilled in the art with feature, so as to make protection domain of the present utility model apparent clear and definite
Define.
Refering to shown in Fig. 1, the utility model provides a kind of low voltage motor winding insulation comprehensive monitor, including single-chip microcomputer system
System 1, and the temperature sampling amplifying unit 2 being connected with SCM system 1, amplifier unit 3 of intaking, zero-sequence current input list
Member 7, online insulaion resistance input block 8, display module 4 and Keysheet module 5, temperature sampling amplifying unit 2 include three tunnel temperature
Amplifier circuit, three road temperature sampling amplifying circuits gather three winding temperatures or axle of electric pump by temperature sensor respectively
Temperature is held, water inlet amplifier unit includes three tunnels water inlet amplifier circuit and all the way environment water level amplifier circuit, should
Three tunnels water inlet amplifier circuit gathers motor cavity leak, grease chamber water inlet and terminal box by detecting element of intaking respectively and intake
Deng signal, environment water level amplifier circuit collection ambient water water level signal, online the insulaion resistance input block 8 and three-phase
Alternating current generator is connected, and machine winding insulating resistance value is detected by measure loop, and the zero-sequence current input block 7 includes zero sequence electricity
Current transformer, zero sequence current mutual inductor detects zero sequence leakage current value of the motor in operation engineering by measure loop.This practicality
New to be detected by 2 pair of three tunnel temperature of temperature sampling amplifying unit, by intaking, amplifier unit enters to three tunnel leaks
Row detection, while being detected to environment water level, detects motor in operation engineering by the measure loop of zero-sequence current input block 7
In zero sequence leakage current value, pass through the online measure loop of insulaion resistance input block 8 detect machine winding insulating resistance value.Effectively
The electric pump that solves be likely to occur machine winding or bearing overtemperature, motor cavity leak, grease chamber water inlet, wiring in the process of running
Box water inlet, the failure such as environment water level is too low, machine winding insulating resistance value declines, zero sequence leakage current value is excessive in motor operation,
The unexpected generation and expansion of accident are effectively prevented, loss is bottomed out.
In the utility model, temperature sensor uses three-wire type resistance, the water inlet intake with terminal box of being intake for grease chamber
Detecting element is water resistance, and the water inlet detecting element for motor cavity leak is switch, for detecting zero sequence leakage current
Detecting element be zero sequence current mutual inductor, gauge internal occurs the principle for detecting machine winding insulating resistance value
DC500V voltages are added on three phase alternating current motor (3~M) winding A/B/C three-phase windings by a cable, then pass through electricity
Machine (3~M) shell geodesic and instrument the earth line end connect into a closed loop, detect the earth leakage current value of motor,
By computer disposal, the insulating resistance value of motor over the ground is calculated.It is preferred that, SCM system is also associated with warning output list
Member.
Refering to shown in Fig. 2, the model STM8S207R8T6 of the SCM system 1 can also be carried out according to actual needs
Selection.
Refering to shown in Fig. 3, environment water level amplifier circuit include resistance R41, resistance R46, resistance R54, resistance R86,
Electric capacity C31, electric capacity C54, voltage-regulator diode D16, follower U11A；Wherein, voltage-regulator diode D16 plus earth, voltage stabilizing two
Pole pipe D16 negative electrode after resistance R54 with follower U11A input anode by being connected, electric capacity C31 and voltage-regulator diode D16
Parallel connection, resistance R41 one end is connected between diode D16 negative electrode and resistance R54, and the resistance R41 other ends are adopted with environment water level
Sample amplifying circuit signal input part is connected, and resistance R46 one end ground connection, the input of the resistance R46 other ends and follower U11A is rectified
Pole is connected, and follower U11A input cathode is connected with its output end, and follower U11A output end passes sequentially through resistance
It is grounded after R86, electric capacity C54.
The principle of the environment water level amplifier circuit is：Diode D16, electric capacity C31 constitute clamper filter circuit, will
The strong transition high RST of water resistance input signal is clamped in the range of safe voltage, is prevented because of outside high interference signal corruption single-chip microcomputer
System 1；R41 is pull-up resistor；Resistance R54, resistance R46 be amplifier in protective resistance, prevent external disturbance electric current compared with
Burn operational amplifier greatly；U11A is follower, by U (X-DJ) signal 1:1 amplification output；Resistance R86, electric capacity C54 groups
Into RC wave filters, the ripple signal of output voltage is filtered away to the ANE ends for inputing to SCM system 1.
In the present embodiment, water inlet amplifier circuit is identical with the circuit structure of environment water level amplifier circuit.When
Can also be so other amplifier circuits of the prior art.
Refering to shown in Fig. 4, the B phases of the terminal of instrument the 16th and motor (3~M) described in the online insulaion resistance input block
Line is connected, the terminal of instrument the 15th and the connection of motor (3~M) shell geodesic, and its operation principle is the online insulated electro of the instrument
It is that the terminal of instrument the 16th passes through a cable and the A/B/C of motor (3~M) to hinder input block to include DC500V voltages to occur end
It is connected and connect to form a closed loop detection unit by motor (3~M) shell and instrumentation grounding the end i.e. terminal of instrument the 15th again,
Detect machine winding insulation against ground resistance value；The zero-sequence current input block 7 includes zero sequence current mutual inductor, the instrument the
25th, the 26th terminal is connected with zero sequence current mutual inductor output line respectively, and its operation principle is the instrument the 25th, the 26th terminal
Connected respectively with zero sequence current mutual inductor output line, the current value sensed by zero sequence current mutual inductor, detection motor is in fortune
Zero sequence leakage current value in row.
Refering to shown in Fig. 5, temperature sampling amplifying circuit includes resistance R12, resistance R16, resistance R18, resistance R22, resistance
R23, resistance R33, resistance R34, resistance R35, resistance R72, electric capacity C21, electric capacity C43, diode D12 and amplifier U10A, its
In, resistance R18 one end ground connection, the input cathode that the other end passes sequentially through after resistance R22, resistance R23 with amplifier U10A connects
Connect, resistance R16 one end is connected between resistance R22 and resistance R23, and the other end is connected with+2.5V voltages, and resistance R12 is connected to
Between amplifier U10A input cathode and output end, amplifier U10A output end passes sequentially through resistance R72 and electric capacity C43
After be grounded, diode D12 plus earth, diode D12 negative electrode is rectified by the input after resistance R30 with amplifier U10A
Pole is connected, and electric capacity C21 is in parallel with diode D12, and diode D12 negative electrode is also connected with resistance R33 one end, resistance R34 one end
Diode D12 negative electrode is connected to, the other end is connected with+2.5V voltages, resistance R35 one end connection amplifier U10A input
Positive pole, other end ground connection.
The principle of temperature sampling amplifying circuit is：Resistance R23, resistance R30, resistance R12 and amplifier U9B compositions are typical
Subtracting amplifier, its multiplication factor Vout=R12/R23(VR30-VR23)；Resistance R72, electric capacity C43 constitute RC wave filters, will export
The ripple signal of voltage filters away the ANA ends for inputing to SCM system 1；Resistance 16, resistance R18, resistance R34, resistance R35,
Resistance R22 constitutes bridge-type bridge circuit, the U when R (A-com, A-pt) change in resistanceR30-UR23Voltage produce change, through subtracting
Made a gift to someone after the amplification of method amplifier after SCM system 1 carries out computing and be output to display screen again and show corresponding temperature value；Diode
D12, electric capacity C21 constitute clamp circuit, and the strong transition high RST of temperature input signal is clamped in the range of safe voltage, prevented
Because of outside high interference signal corruption SCM system 1.Motor, terminal box water conduction resistance be less than 50K Ω (or switch be 0
Ω), when the resistance of grease chamber water conduction is less than 30K Ω (or switch is 0 Ω), the action of alarm relay KS (normally opened) contact, alarm
Output.When the conduction resistance of environment water level water is more than 60K Ω (switch is open circuit), control relay KJ (normally closed/normally opened) contact,
Relay KS (normally opened) contact is acted, warning output.
Refering to shown in Fig. 6, SCM system is also connected with RS485 communicating circuits, and communicating circuit includes optocoupler U3, optocoupler
U5, optocoupler U7, transceiver U4, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10,
Diode D4, diode D5, electric capacity C6；Wherein optocoupler U3 1 pin is connected by R3 with+3.3V voltages, and optocoupler U3 2 pin connect
Ground, optocoupler U3 3 pin are connected by 1 pin after resistance R4 with transceiver U4, and optocoupler U3 4 pin are connected with input power；Optocoupler
U5 1 pin is connected with+3.3V voltages, and optocoupler U5 2 pin are connected with resistance R7 one end, optocoupler U5 3 pin ground connection, optocoupler U5's
4 pin are connected by resistance R5 with input power, and 2 pin also with transceiver U4 of optocoupler U5 4 pin, 3 pin are connected；Optocoupler U7 1 pin
It is connected with+3.3V voltages, optocoupler U7 2 pin are connected with resistance R10 one end, optocoupler U7 3 pin ground connection, optocoupler U7 4 pin lead to
Cross resistance R9 to be connected with input power, optocoupler U7 4 pin are also connected with transceiver U4 4 pin；Transceiver U4 5 pin ground connection, receives
Hair device U4 6 pin passed sequentially through and be grounded after resistance R8, diode D5, and transceiver U4 7 pin pass sequentially through resistance R6, diode D4
After be grounded, transceiver U4 8 pin are connected with input power, and transceiver U4 8 pin also pass through after electric capacity C6 be grounded.RS485 leads to
Networking communication can be carried out with PLC, PC computer by interrogating circuit, and submersible motor operation conditions can be monitored in real time.
Refering to shown in Fig. 7, benchmark negative voltage integrated circuit can use chip MC34063, and it is connected with SCM system,
For producing -3.3V reference voltages, benchmark negative voltage includes direct current transducer U17, resistance R57, resistance R78, resistance R81, electricity
Hold C48, electric capacity C49, electric capacity C50, electric capacity C51, diode D29, triode Q6, inductance L1；Input power and direct current transducer
U17 1 pin, 6 pin, 7 pin, the connection of 8 pin, direct current transducer U17 2 pin after inductance L1 by being grounded, and the 2 of direct current transducer U17
Pin after diode D29 with -3.3V voltages by being connected, and direct current transducer U17 3 pin are connected by electric capacity C48 and -3.3V voltages
Connect, direct current transducer U17 4 pin are connected with -3.3V voltages, and -3.3V voltages, by being grounded after electric capacity C50, -3.3V voltages lead to
Cross after electric capacity C51 and be grounded, direct current transducer U17 4 pin are also connected by resistance R78 with direct current transducer U17 5 pin, direct current
Converter U17 5 pin after resistance R57 by being grounded, and direct current transducer U17 6 pin after electric capacity C49 by being grounded, triode Q6
Emitter stage be connected with input power, triode Q6 colelctor electrode is connected with direct current transducer U17 2 pin, triode Q6 base
Pole after resistance R81 by exporting.Instrument positive voltage is converted into the negative benchmark electricity of -3.3V voltages for instrument mainboard amplifier
Use in source.
Display module shows that one group of displays temperature, LED shows corresponding temperature value using two group of three Digital sum pipe,
The insulation over the ground of the static winding of another group of display and zero-sequence current value, LED show corresponding to numerical value.3 points are entered water state and referred to
Show LED, an environment exsiccosis indication LED lamp runs indication LED lamp, " a prison during one controller normal condition
Survey/monitoring " status indicator LED lamp.By key operation, to alarming value, the threshold value that transfinites is configured.Display module carries RS485
Output interface, can carry out networking communication with PLC, PC computer, submersible motor operation conditions can be monitored in real time.
Refering to the schematic diagram for the binding post for shown in Fig. 8, being utility model, the corresponding wiring of its terminal number is defined as follows
Shown in table 1.
Table 1
| Terminal number | Wiring is defined | Terminal number | Wiring is defined |
| 1、2、12 | Meet A roads temperature Pt100 | 15 | External geodesic |
| 3、4、12 | Meet B roads temperature Pt100 | 16 | The DC500V output termination any phases of motor ABC |
| 5、6、12 | Meet C roads temperature Pt100 | 17、20 | Connect SR |
| 7、12 | Line box has water electrode or switch | 18、20 | Connect breaker normally closed auxiliary contact |
| 8、12 | Motor has water electrode or switch | 19、21、22 | The passive normally-open normally-close contact of control output |
| 9、12 | Grease chamber has water electrode or switch | 23、24 | The passive normally opened contact of controller alarm |
| 10、12 | Environment level electrode or switch | 25、26 | ZCT is inputted |
| 11、13、14 | Meet RS-485G, A, B | 27、28 | Working power 65V-255VAC/DC |
Monitor of the present utility model has two kinds of operational modes：Monitoring mode and monitoring pattern, are provided by status lamp, prison
Survey LED is monitoring pattern when bright.
Monitoring mode
1st, display motor three tunnel (represents) temperature value (hereinafter referred to as 3 temperature) with symbol A, B, C in real time.
2nd, respectively 3 temperature thresholds can be carried out with digital setting.
3rd, motor temperature rise is alarmed：When motor winding temperature superelevation or bearing temperature superelevation, the monitor buzzer sound, panel
Upper corresponding malfunction indicator lamp is bright, and shows its temperature, and relay KJ, KS be normally closed/normally opened contact action, run indicator LED
Go out.
4th, motor entering water is alarmed：When machine winding leak, terminal box leak, grease chamber humidity such as increase at the failure, monitor
Corresponding malfunction indicator lamp is bright on the interior buzzer sound, panel, the action of relay KS normally opened contacts.
5th, the ultralow alarm of environment water level：When motor external environment water level is less than setting value, the buzzer sound in monitor,
Corresponding warning indication lamp is bright on panel, and relay KJ, KS be normally closed/normally opened contact action, and run indicator LED goes out.
6th, motor insulation alarm：The online insulation values of motor are shown in real time, and before motor puts into operation, monitor is to machine winding
Apply DC500V voltages, online insulation values can be monitored automatically, insulation against ground is less than 0.5M Ω, and (this value can insulate according to motor
Level requires setting) when, monitor sends sound and light alarm, and relay KJ, KS be normally closed/normally opened contact action, run indicator LED
Go out.
7th, zero-sequence current is alarmed：Zero-sequence current value during motor operation, after motor puts into operation, monitor energy are shown in real time
Automatic monitoring zero-sequence current (this value can be set, 3 times of generally normal zero-sequence current value), when the increase of motor internal humidity or
Water inlet, when insulation against ground drops to setting value, and when entering the early stage of insulation damages transition, monitor sends sound and light alarm, after
Electrical equipment KJ, KS be normally closed/normally opened contact action, run indicator LED goes out.
8th, except sound, light alarm inside monitor when above failure occurs, also with outer taking alarm.Thermo-field thoery, ambient water
During the failure such as position water shortage, zero-sequence current be very big and insulation values are relatively low, in addition to sound and light alarm, can also power-off protection be carried out to motor.
Monitoring pattern
1st, monitoring pattern (monitoring LED) lamp is bright.
2nd, in monitoring pattern, monitor only has monitoring function, i.e., when monitor detects failure, instrument itself buzzer
Alarm, alarm relay KS outputs, control relay KJ is exported without control.
Although being described in conjunction with the accompanying embodiment of the present utility model, patent owner can want in appended right
Various deformations or amendments are made within the scope of asking, as long as no more than the protection model described by claim of the present utility model
Enclose, all should be within protection domain of the present utility model.
Claims (10)
1. a kind of low voltage motor winding insulation comprehensive monitor, it is characterised in that：Including SCM system, and with single-chip microcomputer system
The temperature sampling amplifying unit of system connection, water inlet amplifier unit, zero-sequence current input block, the input of online insulaion resistance are single
Member, display module and Keysheet module, the temperature sampling amplifying unit include three road temperature sampling amplifying circuits, and three tunnel temperature are adopted
Sample amplifying circuit gathers three winding temperatures or bearing temperature of electric pump, the water inlet amplifier by temperature sensor respectively
Unit includes three tunnels water inlet amplifier circuit and all the way environment water level amplifier circuit, three tunnel water inlet amplifier circuit
Motor cavity leak, grease chamber water inlet and terminal box water inlet signal, environment water level sampling are gathered by detecting element of intaking respectively
Amplifying circuit gathers environment water level signal；The online insulaion resistance input block is connected with three phase alternating current motor, online insulation
The voltage generation end of resistance input block to be connected by a cable with motor A/B/C connect again by motor housing and instrument
Ground terminal connects to form a closed loop detection unit, detects machine winding insulation against ground resistance value；The zero-sequence current input block
Including zero sequence current mutual inductor, the zero sequence leakage current value of zero sequence current mutual inductor detection motor in operation.
2. low voltage motor winding insulation comprehensive monitor according to claim 1, it is characterised in that：The environment water level is adopted
Sample amplifying circuit include resistance R41, resistance R46, resistance R54, resistance R86, electric capacity C31, electric capacity C54, voltage-regulator diode D16,
Follower U11A；Wherein, voltage-regulator diode D16 plus earth, voltage-regulator diode D16 negative electrode by after resistance R54 with
Connected with device U11A input anode, electric capacity C31 is in parallel with voltage-regulator diode D16, and resistance R41 one end is connected to diode
Between D16 negative electrode and resistance R54, the resistance R41 other ends are connected with environment water level amplifier circuit signal input, resistance
R46 one end is grounded, and the resistance R46 other ends are connected with follower U11A input anode, follower U11A input cathode
It is connected with its output end, follower U11A output end, which to be passed sequentially through, be grounded after resistance R86, electric capacity C54.
3. low voltage motor winding insulation comprehensive monitor according to claim 2, it is characterised in that：It is described enter water level sampling
Amplifying circuit is identical with the circuit structure of the environment water level amplifier circuit.
4. low voltage motor winding insulation comprehensive monitor according to claim 1, it is characterised in that：The online insulated electro
Resistance input block is connected with the terminal of instrument the 16th and motor B phase lines, the terminal of instrument the 15th and the connection of motor housing geodesic；It is described
Zero-sequence current input block includes zero sequence current mutual inductor, and the instrument the 25th, the 26th terminal are respectively and zero sequence current mutual inductor
Output line is connected.
5. low voltage motor winding insulation comprehensive monitor according to claim 1, it is characterised in that：Temperature sampling amplification electricity
Road includes resistance R12, resistance R16, resistance R18, resistance R22, resistance R23, resistance R33, resistance R34, resistance R35, resistance
R72, electric capacity C21, electric capacity C43, diode D12 and amplifier U10A, wherein, resistance R18 one end ground connection, the other end is passed sequentially through
It is connected after resistance R22, resistance R23 with amplifier U10A input cathode, resistance R16 one end is connected to resistance R22 and resistance
Between R23, the other end is connected with+2.5V voltages, resistance R12 be connected to amplifier U10A input cathode and output end it
Between, amplifier U10A output end, which to be passed sequentially through, be grounded after resistance R72 and electric capacity C43, diode D12 plus earth, two poles
Pipe D12 negative electrode after resistance R30 with amplifier U10A input anode by being connected, and electric capacity C21 is in parallel with diode D12,
Diode D12 negative electrode is also connected with resistance R33 one end, and resistance R34 one end is connected to diode D12 negative electrode, the other end with+
2.5V voltages are connected, resistance R35 one end connection amplifier U10A input anode, other end ground connection.
6. low voltage motor winding insulation comprehensive monitor according to claim 1, it is characterised in that：The SCM system
Also it is connected with RS485 communicating circuits, the communicating circuit includes optocoupler U3, optocoupler U5, optocoupler U7, transceiver U4, resistance R3, electricity
Hinder R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, diode D4, diode D5, electric capacity C6；Wherein
Optocoupler U3 1 pin is connected by R3 with+3.3V voltages, optocoupler U3 2 pin ground connection, optocoupler U3 3 pin by after resistance R4 with receipts
Device U4 1 pin connection is sent out, optocoupler U3 4 pin are connected with input power；Optocoupler U5 1 pin is connected with+3.3V voltages, optocoupler U5's
2 pin are connected with resistance R7 one end, and optocoupler U5 3 pin ground connection, optocoupler U5 4 pin are connected by resistance R5 with input power, light
2 pin of coupling U5 4 pin also with transceiver U4,3 pin are connected；Optocoupler U7 1 pin is connected with+3.3V voltages, optocoupler U7 2 pin and electricity
R10 one end connection is hindered, optocoupler U7 3 pin ground connection, optocoupler U7 4 pin are connected by resistance R9 with input power, the 4 of optocoupler U7
Pin is also connected with transceiver U4 4 pin；Transceiver U4 5 pin ground connection, transceiver U4 6 pin pass sequentially through resistance R8, diode
It is grounded after D5, transceiver U4 7 pin, which to be passed sequentially through, be grounded after resistance R6, diode D4, and transceiver U4 8 pin and input power connect
Connect, and transceiver U4 8 pin also pass through ground connection after electric capacity C6.
7. low voltage motor winding insulation comprehensive monitor according to claim 1, it is characterised in that：Benchmark negative electricity volt circuit
Be connected with SCM system, the benchmark negative electricity volt circuit include direct current transducer U17, resistance R57, resistance R78, resistance R81,
Electric capacity C48, electric capacity C49, electric capacity C50, electric capacity C51, diode D29, triode Q6, inductance L1；Input power is changed with direct current
Device U17 1 pin, 6 pin, 7 pin, the connection of 8 pin, direct current transducer U17 2 pin by being grounded after inductance L1, direct current transducer U17's
2 pin after diode D29 with -3.3V voltages by being connected, and direct current transducer U17 3 pin are connected by electric capacity C48 and -3.3V voltages
Connect, direct current transducer U17 4 pin are connected with -3.3V voltages, and -3.3V voltages, by being grounded after electric capacity C50, -3.3V voltages lead to
Cross after electric capacity C51 and be grounded, direct current transducer U17 4 pin are also connected by resistance R78 with direct current transducer U17 5 pin, direct current
Converter U17 5 pin after resistance R57 by being grounded, and direct current transducer U17 6 pin after electric capacity C49 by being grounded, triode Q6
Emitter stage be connected with input power, triode Q6 colelctor electrode is connected with direct current transducer U17 2 pin, triode Q6 base
Pole after resistance R81 by exporting.
8. low voltage motor winding insulation comprehensive monitor according to claim 1, it is characterised in that：For grease chamber water inlet and
The water inlet detecting element of terminal box water inlet is water resistance, and the water inlet detecting element for motor cavity leak is switch.
9. low voltage motor winding insulation comprehensive monitor according to claim 1, it is characterised in that：The SCM system
Model STM8S207R8T6.
10. low voltage motor winding insulation comprehensive monitor according to claim 1, it is characterised in that：The single-chip microcomputer system
System is also associated with alarm output unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720007087.4U CN206321768U (en) | 2017-01-04 | 2017-01-04 | A kind of low voltage motor winding insulation comprehensive monitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720007087.4U CN206321768U (en) | 2017-01-04 | 2017-01-04 | A kind of low voltage motor winding insulation comprehensive monitor |
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| Publication Number | Publication Date |
|---|---|
| CN206321768U true CN206321768U (en) | 2017-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720007087.4U Withdrawn - After Issue CN206321768U (en) | 2017-01-04 | 2017-01-04 | A kind of low voltage motor winding insulation comprehensive monitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707165A (en) * | 2017-01-04 | 2017-05-24 | 合肥致臻电子科技有限公司 | Insulating comprehensive monitor for low-voltage motor winding |
| CN115825527A (en) * | 2022-12-12 | 2023-03-21 | 江苏靖江互感器股份有限公司 | LC compatible voltage sensor |
-
2017
- 2017-01-04 CN CN201720007087.4U patent/CN206321768U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707165A (en) * | 2017-01-04 | 2017-05-24 | 合肥致臻电子科技有限公司 | Insulating comprehensive monitor for low-voltage motor winding |
| CN106707165B (en) * | 2017-01-04 | 2023-11-21 | 合肥致臻电子科技有限公司 | Insulating integrated monitor of low-voltage motor winding |
| CN115825527A (en) * | 2022-12-12 | 2023-03-21 | 江苏靖江互感器股份有限公司 | LC compatible voltage sensor |
| CN115825527B (en) * | 2022-12-12 | 2023-11-21 | 江苏靖江互感器股份有限公司 | LC compatible voltage sensor |
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