CN2144313Y - Monitor for insulativity of earth-free AC low-voltage network to earth - Google Patents
Monitor for insulativity of earth-free AC low-voltage network to earth Download PDFInfo
- Publication number
- CN2144313Y CN2144313Y CN 92229696 CN92229696U CN2144313Y CN 2144313 Y CN2144313 Y CN 2144313Y CN 92229696 CN92229696 CN 92229696 CN 92229696 U CN92229696 U CN 92229696U CN 2144313 Y CN2144313 Y CN 2144313Y
- Authority
- CN
- China
- Prior art keywords
- earth
- voltage
- earthing
- phase
- electrical network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a monitor for insulativity of an earth-free AC low-voltage network to earth, comprising an earthing voltage meter, a current meter, a light-word plate, a diverting switch, a detection press-button and a lond speaker which are totally arranged on the case face. While the network is connected with earth, the monitoring signal of earthing light and sound can be delivered; the earthing voltage, the electric contact circuit simulated with person and each of related unbalanced circuit can be measured; the sound test of the utility model can be processed. The utility model with advantages of convenient vision and listening can be carried and hung anywhere in the treatment of earthing faults, which can also be used for the earthing insulating monitoring and the detection of earthing circuit, and the utility model is suitable for various earth-free AC low-voltage network.
Description
The utility model relates to the AC low-tension electrical network, when adopting the earth-free method of operation, and the supervision of insulation against ground and detection.
Earth-free mode of AC low-tension electrical network and direct grounding way ratio, can improve the safe reliability and the economic benefit of power supply, but when ground connection takes place in electrical network one mutually, other phase-to-ground voltages present line voltage, the possibility that ground short circuit takes place is again arranged, so must install the insulating monitoring device, also not have a kind of complete monitoring instrument at present.
The purpose of this utility model is filled up deficiency of the prior art exactly.
The purpose of this utility model by its four circuit, is finished seven kinds of functions and is reached: 1, inserts Xiao (CX
1-1), fuse (RD
1), signal transformer (XB), change-over switch (K
1-1K
1-2), insert Xiao (CX
1-3) connecting mutually is connected to the neutral line (N) of low voltage electric network or the third phase (L of three-phase quarter-phase system electrical network
3), the second phase (L
2) and earthing pole (O) between, the secondary coil of signal transformer (XB) is connected with rectifier bridge (ZQ), filter capacitor (C) is parallel to the two poles of the earth after the rectification, resistor (R
5) and light emitting diode (G
1, G
2) also being parallel to the two poles of the earth after the rectification after the series connection, music block (1C) is respectively through resistor R
2, R
4Be connected with transistor (T) base stage with the output terminal in parallel and after modulation of the two poles of the earth after the rectification, the emitter of transistor (T) and collector are respectively through resistor R
3The two poles of the earth that loudspeaker (YD) is connected in after the rectification constitute the supervision signal circuit, when the voltage that is added on signal transformer (XB), after reaching certain value, can send " ground connection " alarm window signal and (modulate the purpose of certain tune with the acoustic signal of certain ground connection tune, it is in service to be to work as two hours single-phase earthing of permission, unlikely lasting dullness and the ear-piercing sound equipment of sending); 2, voltage table (V) and signal transformer (XB) formation in parallel ground voltage metering circuit with the indicated value of voltage table (V), can be weighed each relatively insulation and the unbalanced degree of voltage-to-ground; 3, insert Xiao (X
1-2), fuse (RD
2), resistor (R
1), reometer (A) and jack (CK), button (AN), insert Xiao (CX
1-3) connecting mutually is connected to the first phase (L of low voltage electric network
1) and earthing pole (O) between constitute the biasing hookup, in servicely connect the biasing hookup with button (AN), can detect: can 1. supervise telltale regular event, and 2. whether ground voltage table (V) indicated value has respective change, 3. because resistor (R
1) resistance simulates the configuration of personal resistance value, can detect the current value that the personal electric shock of simulation may be passed through, respectively insulation status relatively of electrical network can be compared, be analyzed to the 4. ground current value that inserts according to the biasing hookup and the variation of ground voltage front and back; 4, insert Xiao (CX
1-2), fuse (RD
2), resistor (R
1), reometer (A) and jack (CK), change-over switch (K
1-3K
1-1), signal transformer (XB) and voltage table (V), fuse (RD
1), insert Xiao (CX
1-1) connecting mutually is connected to the first phase (L of low voltage electric network
1) with the third phase (L of the neutral line (N) or three-phase, quarter-phase system electrical network
3), the second phase (L
2) between constitute this machine hookup, change-over switch switches to testing position (K
1-1With K
1-3Connect), whether can test above-mentioned 1,2,3 circuit normal.
The utility model is connected with electrical network, adopts two-phase commonly used to insert Xiao and socket, can conveniently insert electrical network.The shell surface version is provided with voltage table, reometer, " ground connection " alarm window, loudspeaker, change-over switch and button etc., supervision, easy to operate also is provided with and carries handle and hanging hole, uses everywhere for handling in the earth fault, general electrician can grasp use through study.
Advantage of the present utility model is to use the Kirchhoff's law principle, AC low-tension electrical network in three-phase, the various standards of two-phase, adopt four lines, three-way, two line bridge circuits respectively, more highly sensitive than other supervisory devices, be provided with four supervision, detection, hookup, function is more complete, can supervise and detect the insulation against ground of earth-free AC low-tension electrical network effectively.
The drawing of accompanying drawing is described as follows:
Accompanying drawing 2 is the front view (FV) of the utility model housing.1 for inserting Xiao and sheathed conductor, and 2 is housing, and 3 is voltage table, and 4 is alarm window, and 5 is reometer, and 6 is change-over switch, and 7 is loudspeaker, and 8 is button, and 9 for carrying handle, and 10 is hanging hole, and 11 is nameplate.
Below in conjunction with accompanying drawing,, be described further realizing preferred embodiment of the utility model:
The utility model is connected with electrical network, when adopting three of diphasic zone earthing pole to insert Xiao, socket, as slotting Xiao (CX of accompanying drawing 1
1-1) corresponding to the neutral line (N) of electrical network, when three-phase or quarter-phase system electrical network do not have the neutral line, insert Xiao (CX
1-1) corresponding to electrical network third phase (L
3) or the second phase (L
2), insert Xiao (CX
1-2) corresponding to the electrical network first phase (L
1), insert Xiao (CX
1-3) corresponding to earthing pole.
The link position of electrical network and the utility model supply socket should be in earth leakage protective device protection domain mains side in addition.Supply socket should be located at the place that people's distribution duty room, administrative duty room is often arranged or the people is often arranged, so that can in time find signal and abnormal conditions, informs the person in charge.In seeking earth fault, the utility model also can carry or hang everywhere, to monitor on the spot and to detect.
Work as change-over switch K in the use
1-1With K
1-2Connect, be " input " position.Change-over switch K
1-1With K
1-3Connect, be " test " position.
When change-over switch of the present utility model in " test " position, the low voltage electric network first phase (L
1) power supply through inserting Xiao (CX
1-2), fuse (RD
2), resistor (R
1), reometer (A) and jack (CK), change-over switch (K
1-3K
1-1), signal transformer (XB) and voltage table (V), fuse (RD
1), insert Xiao (CX
1-1) with the third phase (L of the neutral line or three-phase, quarter-phase system electrical network
3), the second phase (L
2) connect this machine hookup, reometer (A) has the electric current indication, and voltage table (V) indicated value is near the electrical network phase voltage, and supervision signal " ground connection " alarm window is bright, and ground connection tune sound equipment is started the music, and proves that the utility model circuit is normal.Change-over switch is switched to " input " position, the third phase (L of the neutral line of low voltage electric network (N) or three-phase, quarter-phase system electrical network
3), the second phase (L
2) power supply through inserting Xiao (CX
1-1), fuse (RD
1), signal transformer (XB) and voltage table (V), change-over switch (K
1-1K
1-2), insert Xiao (CX
1-3) connect supervision signal circuit and ground voltage metering circuit with earthing pole (O), the electrical network insulation against ground just often, voltage table (V) indication ground voltage is very little, supervises signal and is failure to actuate.If voltage table (V) indication surpasses the signalizing activity magnitude of voltage, the secondary voltage of signal transformer (XB) is a confession light emitting diode (G after rectifier bridge (ZG) rectification, capacitor (C) filtering
1, G
1), one modulates the level of certain tune through music block (1C), after transistor (T) is done voltage and power amplification, makes alarm window, the action of ground connection sound equipment again, illustrates that electrical network has ground connection, should search processing.If voltage table indication is bordering on zero, have two kinds of situations: a kind of is that the electrical network insulation against ground is fine, and a kind of is the third phase (L of network neutral line or three-phase, quarter-phase system electrical network
3), the second phase (L
2) ground connection is arranged, for judging that a kind of situation of genus, can use the biasing hookup this moment, and (AN) presses with button, the low voltage electric network first phase (L
1) the slotting Xiao (CX of power supply warp
1-2), fuse (RD
2), reometer (A) and jack (CX), button (AN), insert Xiao (CX
1-3) be communicated with earthing pole (O), be equivalent to the electrical network first phase (L
1) tentative ground connection, 1. if electrical network insulation against ground fine (comprising the neutral line), then reometer (A) only flows through other leakage currents relatively of electrical network and the electric current of this machine supervision signal and ground voltage metering circuit, numerical value is very little, and the voltage table indication surpasses signalizing activity value, alarm window, the action of ground connection sound equipment; 2. if the L of network neutral line or three-phase quarter-phase system electrical network
3, L
2Relatively ground connection takes place in insulation breakdown, and then this machine supervision signal and ground voltage metering circuit are by short circuit, and reometer (A) flows through electrical network L
1With N(three-phase quarter-phase system electrical network be L
3L
2) between voltage and R
1The rated current of the ratio of resistance, voltage table (V) are still indicated and are bordering on zero, alarm window, and the ground connection sound equipment is failure to actuate; Because resistor (R
1) resistance, simulate personal resistance value configuration, after button (AN) was pressed connection, reometer (A) indicating value was the electrical network first phase (L
1) when taking place, personal electric shock ground connection passes through current value, also be except that the electrical network first phase (L
1) in addition other each out-of-balance current value relatively.In above-mentioned detection, if the range of reometer (A) can not meet the demands, can be connected on the connector being suitable for range or multiple range reometer in addition, insert jack (CK) and use, reometer (A) then cuts immediately.
Claims (2)
1, a kind of earth-free AC low-tension electrical network insulation against ground monitor is made up of signal transformer, voltage table, reometer, change-over switch, button etc., it is characterized in that:
1. signal transformer (XB) end is through fuse (RD
1), insert Xiao (CX
1-1) with power network monitoring (N or L mutually
3, L
2) connect, the other end is through change-over switch (K
1-1K
1-2), insert Xiao (CX
1-3) be connected with earthing pole (0), after the secondary voltage of XB surpassed certain value, through rectifier bridge (ZQ) rectification, one through resistor (R
5) for light emitting diode (G
1, G
2), one through resistor (R
2, R
3, R
4), transistor (T), music block (IC) be for loudspeaker;
2. voltage table (V) is in parallel with signal transformer (XB);
3. a reometer (A) and jack (CK) end are through resistor (R
1), fuse (RD
2), insert Xiao (CX
1-2) with electrical network first (L mutually
1) connect, the other end is through button (AN), slotting Xiao (CX
1-3) be connected with earthing pole (0);
4. change-over switch (K
1-3K
1-1) reometer (A) and jack (CK) can be in series with signal transformer (BX) and voltage table (V).
2, monitor according to claim 1 is characterized in that resistor (R
1) resistance, simulate personal resistance value configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92229696 CN2144313Y (en) | 1992-08-03 | 1992-08-03 | Monitor for insulativity of earth-free AC low-voltage network to earth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92229696 CN2144313Y (en) | 1992-08-03 | 1992-08-03 | Monitor for insulativity of earth-free AC low-voltage network to earth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2144313Y true CN2144313Y (en) | 1993-10-20 |
Family
ID=33772994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92229696 Expired - Fee Related CN2144313Y (en) | 1992-08-03 | 1992-08-03 | Monitor for insulativity of earth-free AC low-voltage network to earth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2144313Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053214A (en) * | 2010-11-08 | 2011-05-11 | 河南省电力公司南阳供电公司 | Small ammeter monitored grounding and selecting device |
| CN110286334A (en) * | 2019-06-25 | 2019-09-27 | 哈尔滨锐驰风力发电有限责任公司 | A kind of DC power supply analogue ground test device |
| CN111983385A (en) * | 2020-08-19 | 2020-11-24 | 国网河南省电力公司漯河供电公司 | Line fault testing method based on asymmetry |
-
1992
- 1992-08-03 CN CN 92229696 patent/CN2144313Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053214A (en) * | 2010-11-08 | 2011-05-11 | 河南省电力公司南阳供电公司 | Small ammeter monitored grounding and selecting device |
| CN110286334A (en) * | 2019-06-25 | 2019-09-27 | 哈尔滨锐驰风力发电有限责任公司 | A kind of DC power supply analogue ground test device |
| CN111983385A (en) * | 2020-08-19 | 2020-11-24 | 国网河南省电力公司漯河供电公司 | Line fault testing method based on asymmetry |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |