CN209400656U - A kind of intelligent meter Formulas I T system insulation monitoring alarm instrument - Google Patents
A kind of intelligent meter Formulas I T system insulation monitoring alarm instrument Download PDFInfo
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- CN209400656U CN209400656U CN201822172780.4U CN201822172780U CN209400656U CN 209400656 U CN209400656 U CN 209400656U CN 201822172780 U CN201822172780 U CN 201822172780U CN 209400656 U CN209400656 U CN 209400656U
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- 238000009413 insulation Methods 0.000 title claims abstract description 18
- 238000012544 monitoring process Methods 0.000 title claims abstract description 16
- 238000002788 crimping Methods 0.000 claims abstract description 18
- 230000005611 electricity Effects 0.000 claims abstract description 18
- 230000000007 visual effect Effects 0.000 claims abstract description 4
- 230000007935 neutral effect Effects 0.000 description 7
- 239000004020 conductor Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 208000033748 Device issues Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to a kind of intelligent meter Formulas I T system insulation monitoring alarm instrument, including terminal block and voltmeter, three-phase electricity crimping connects in terminal block, fuse and needle dc voltmeter are respectively connected in each phase of three-phase electricity crimping, three-phase electricity crimping is also connect with intelligent three-phase voltage table one respectively, three terminals five of intelligent three-phase voltage table one are connected in parallel on a point and connect with the ground terminal of terminal block, the output end of three-phase electricity crimping is also connect with the ground terminal of terminal block, the L1 phase of three-phase electricity crimping, transformer and intelligent three-phase voltage table are connected in L2 phase, transformer and pressure-wire L1, fuse also is provided between L2, combined aural and visual alarm is also connected on the intelligent three-phase voltage table.The monitoring alarm instrument of the utility model can show three phase-to-ground voltages, certain similar ground connection, and for voltage-to-ground with regard to relatively low, another two-phase while higher while three-phase imbalance issue alarm signal when more than setting value, borrow intelligent meter and reach insulation-monitoring function.
Description
Technical field
The utility model relates to for pyroelectric monitor field, more particularly to a kind of intelligent meter Formulas I T system insulation monitoring, alarming
Instrument.
Background technique
Fire-fighting emergency power supply, hospital's major surgery room, underground mine low-voltage power supply must use IT standard.It is required that distribution becomes
Depressor secondary side is not brought up the neutral conductor, can not be grounded, therefore the connection of three phase and ground of low-pressure side not electrically.When normal,
Three phase-to-ground voltages are in a basic balance, are all 220v or so.When first time ground fault occurs, earth current passes through from Earth Phase
Grounding point is formed into a loop by capacitor, the insulation resistance to another two-phase of non-faulting two relatively.Since capacitive reactance and insulation resistance hinder
Value is all very big, so earth current is less, not will lead to this circuit breaker short circuit tripping, such power supply continuity, reliability
It is higher.
But this state be do not allow it is long-standing, it is necessary in time discovery in time processing.Main cause has three aspects.With L1
Illustrate for phase dead ground: (one) L1 phase-to-ground voltage is zero at this time, surveys L1 phase with electroscope, electroprobe does not work, touched with hand
L1 phase will not get an electric shock.But another two phase-to-ground voltage is increased to line voltage 380v (normal 220v or so), increases 1.73 times, is used
Electroscope is surveyed, and brightness obviously increases.If someone contacts L2 phase or L3 phase at this time, electric shock extent of injury will be very serious.
(2) the electrical equipment voltage-to-grounds by same transformer-supplied all at this time are also increased to 380v, part by 220v
Equipment is likely to insulation breakdown and damages.
(3) processing not in time, if separately having a phase to be also grounded, forms two points ground fault, is exactly short circuit, breaker is jumped at two
Lock, scope of power outage increase instead.
Therefore IT system power supply mode is all gone well, system is steady once there is singlephase earth fault although seeming power supply
It is qualitative to be destroyed, it is necessary to which discovery in time excludes ground fault in the shortest time.This just needs to install IT system insulation against ground prison
Device is surveyed, when dropping to dangerous values, device issues alarm signal immediately for any relatively insulation.But any monitoring mode is taking
System insulation against ground cannot be destroyed again simultaneously by obtaining ground signalling.
" Mine Electric Power design specification " also clearly proposes, underground IT system power supply mode must have insulation monitoring device.Mine
Mountain enterprise generally uses JY-82 type leak detection relay as insulation monitoring device, but internal circuit is complicated, and failure rate is high, valence
Lattice are also high, completely not applicable.
Utility model content
The purpose of this utility model is to provide for a kind of utilization intelligent meter Formulas I T system insulation monitoring alarm instrument, allows to
Quickly and effectively detect.
To solve the above problems, the utility model provides a kind of intelligent meter Formulas I T system insulation monitoring alarm instrument, including end
Son row and voltmeter, three-phase electricity crimping connect in terminal block, are respectively connected with fuse and pointer in each phase of three-phase electricity crimping
Formula voltmeter, three-phase electricity crimping are also connect with intelligent three-phase voltage table one respectively, three terminals five of intelligent three-phase voltage table one
It is connected in parallel on a point and is connect with the ground terminal of terminal block, the output end of three-phase electricity crimping also connects with the ground terminal of terminal block
Connect, be connected with transformer and intelligent three-phase voltage table in the L1 phase of three-phase electricity crimping, L2 phase, transformer and pressure-wire L1, L2 it
Between also be provided with fuse, be also connected with combined aural and visual alarm on the intelligent three-phase voltage table.
Further, the transformer is 380V/220V small power single phase transformer.
The utility model mainly utilizes IT system insulating monitoring alarm of the intelligent voltage table in conjunction with mechanical voltmeter.Three
Phase intelligent voltage table is generally used for non-IT system, and connecting terminal 14 connects to neutral, and when imbalance of three-phase voltage can issue alarm signal
Number, and alarming value can be set.But IT system wishes that it can show three opposite voltages, therefore (altogether by terminal 5 14 without the neutral conductor
Three) it is connected in parallel on a point, it is equivalent to three-phase load star connection (voltmeter is all high impedance, substantially not power consumption).
This common point, that is, central point can show three phase-to-ground voltage of IT system after being grounded, and to system insulation without any shadow
It rings.Similarly three-phase needle dc voltmeter is also this connection, shows three phase-to-ground voltages, AC220V is all indicated when normal.
By adopting such a design, the utility model at least has the following advantages:
When imbalance of three-phase voltage, certain it is mutually higher or it is relatively low be more than setting value when intelligent three-phase voltage table can issue alarm
Signal.It is current in phase three-wire three isolated neutral system, that is, IT system, but common point (intelligent meter neutral point) is grounded, and is shown in this way
Show three phase-to-ground voltages, certain similar ground connection, voltage-to-ground is with regard to relatively low, and another two-phase is higher simultaneously, three-phase imbalance simultaneously, more than setting
Alarm signal is issued when definite value, is borrowed intelligent meter and is reached insulating monitoring and warning function.Pointer voltage table function is observation
Three phase-to-ground voltages are more intuitive, more reliable, non-maintaining, only alarm free function.
Detailed description of the invention
Above-mentioned is only the general introduction of technical solutions of the utility model, in order to better understand the technology hand of the utility model
Section, below in conjunction with attached drawing, the utility model is described in further detail with specific embodiment.
Fig. 1 is the structural schematic diagram that the intelligent meter of the utility model combines mechanical tabular form IT system insulating monitoring alarm.
1 is terminal block, and 2 be small power single phase transformer, and 3 be intelligent three-phase voltage table two, control alarm power supply.4 be sound
Light crossing-signal.5 be intelligent three-phase voltage table one, and 6 be needle dc voltmeter, terminal 1, terminal 2 32, terminal 3 36, terminal
4 37, terminal 5 14.
Specific embodiment
Shown in referring to Fig.1, the utility model provides a kind of intelligent meter Formulas I T system insulation monitoring alarm instrument, including terminal block
1, intelligent three-phase voltage table 1 and intelligent three-phase voltage table 23, three-phase electricity crimping connects in terminal block 1, three-phase electricity crimping it is every
Fuse FU and needle dc voltmeter 6 are respectively connected in one phase, three-phase electricity crimping also connects with intelligent three-phase voltage table 1 respectively
It connects, three terminals 5 14 of intelligent three-phase voltage table 1 are connected in parallel on a point and connect with the ground terminal of terminal block 1, three
The output end of phase voltage line is also connect with the ground terminal of terminal block, be connected in the L1 phase of three-phase electricity crimping, L2 phase transformer and
Intelligent three-phase voltage table 23 also is provided with fuse, the intelligent three-phase voltage table 23 between transformer 2 and pressure-wire L1, L2
On be also connected with combined aural and visual alarm 4.
The transformer is 380V/220V small power single phase transformer.
The terminal 1 and terminal 2 32 of the intelligent three-phase voltage table two are that intelligent three-phase voltage table two provides power supply, are held
Son 3 36 and terminal 4 37 are intelligent meter warning output.
FU1-FU5 is fuse, provides short-circuit protection.
The intelligent three-phase voltage table one is three-phase intelligent table, and when imbalance of three-phase voltage, certain is mutually higher or relatively low is more than
Alarm signal can be issued when setting value.It is phase three-wire three isolated neutral system, that is, IT system in the application, but common point (intelligence
Energy table neutral point) ground connection, in this way three phase-to-ground voltages of display, certain similar ground connection, for voltage-to-ground with regard to relatively low, another two-phase is inclined simultaneously
High while three-phase imbalance, issues alarm signal when more than setting value, reaches insulating monitoring warning function with intelligent meter.Refer to
Pin type voltmeter can also monitor three phase-to-ground voltages, more intuitive, more reliable, non-maintaining.
If L1 phase dead ground, i.e. ground wire are exactly L1 phase, so this phase-to-ground voltage is the pointer voltage of zero, L1 phase
List index is zeroed at once, and L2 and L3 phase-to-ground voltage is line voltage 380V naturally i.e. to L1 phase voltage at this time.Intelligent meter is shown
Three-phase voltage is 0,380,380, and one is mutually relatively low, and two-phase is higher, and terminal 3 36 is connected immediately with terminal 4 37, issues sound-light alarm
Signal.
The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model
Limitation, those skilled in the art make a little simple modification, equivalent variations or modification using the technology contents of the disclosure above,
It falls within the protection scope of the present utility model.
Claims (2)
1. a kind of intelligent meter Formulas I T system insulation monitoring alarm instrument, which is characterized in that including terminal block and voltmeter, three-phase voltage
Line connects in terminal block, fuse and needle dc voltmeter is respectively connected in each phase of three-phase electricity crimping, three-phase electricity crimping is also
Connect respectively with intelligent three-phase voltage table one, three terminals five of intelligent three-phase voltage table one be connected in parallel on a point and with end
The ground terminal connection of son row, the output end of three-phase electricity crimping are also connect with the ground terminal of terminal block, the L1 phase of three-phase electricity crimping, L2
It is connected with transformer and intelligent three-phase voltage table in phase, fuse, the intelligence also are provided between transformer and pressure-wire L1, L2
Combined aural and visual alarm is also connected on three-phase voltage meter.
2. intelligent meter Formulas I T system insulation monitoring alarm instrument according to claim 1, which is characterized in that the transformer is
380V/220V small power single phase transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822172780.4U CN209400656U (en) | 2018-12-24 | 2018-12-24 | A kind of intelligent meter Formulas I T system insulation monitoring alarm instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822172780.4U CN209400656U (en) | 2018-12-24 | 2018-12-24 | A kind of intelligent meter Formulas I T system insulation monitoring alarm instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209400656U true CN209400656U (en) | 2019-09-17 |
Family
ID=67895832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822172780.4U Expired - Fee Related CN209400656U (en) | 2018-12-24 | 2018-12-24 | A kind of intelligent meter Formulas I T system insulation monitoring alarm instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209400656U (en) |
-
2018
- 2018-12-24 CN CN201822172780.4U patent/CN209400656U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190917 |
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| CF01 | Termination of patent right due to non-payment of annual fee |