CN203233139U - Transformer neutral-wire break protection device - Google Patents
Transformer neutral-wire break protection device Download PDFInfo
- Publication number
- CN203233139U CN203233139U CN 201320104960 CN201320104960U CN203233139U CN 203233139 U CN203233139 U CN 203233139U CN 201320104960 CN201320104960 CN 201320104960 CN 201320104960 U CN201320104960 U CN 201320104960U CN 203233139 U CN203233139 U CN 203233139U
- Authority
- CN
- China
- Prior art keywords
- transformer
- wire
- neutral
- intermediate relay
- break
- 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
Links
- 230000007935 neutral effect Effects 0.000 claims abstract description 29
- 230000001681 protective effect Effects 0.000 claims description 8
- 230000000007 visual effect Effects 0.000 abstract description 3
- 230000001012 protector Effects 0.000 abstract 2
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000006837 decompression Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Abstract
Disclosed is a transformer neutral-wire break protection device which belongs to the technical field of protection. An object of design is to prevent electrical equipment from being ruined due to a neutral wire circuit break. The transformer neutral-wire break protection device is characterized in that: the transformer neutral-wire break protection device comprises an intermediate relay, a leakage protector and an audible and visual alarm; a control coil of the intermediate relay is connected between a phase wire at a low-voltage side and a neutral wire of a distribution transformer via the leakage protector; a normally open contact of the intermediate relay is connected in series in a control circuit of a main contactor of a transformer integrated power-distribution cabinet; and a normally closed contact is connected in series with the audible and visual alarm and then is connected between two phase wires at the low-voltage side of the distribution transformer. According to the utility model, the intermediate relay is used to monitor break-make of the transformer neutral wire in a real-time manner; and, when the neutral wire is broken, the intermediate relay rapidly cuts off the control circuit of the main contactor of the transformer integrated power-distribution cabinet to separate electrical equipment from the transformer, so that the electrical equipment is effectively protected, and economy losses, caused by the neutral wire circuit break, of electric power enterprises and users are prevented.
Description
Technical field
The utility model relates to a kind of supply line that can cut off the user after the transformer neutral line opens circuit automatically, prevents the device that power consumption equipment burns, and belongs to the resist technology field.
Background technology
To the low-voltage circuit exit, neutral line joint is more, causes that very easily the neutral line opens circuit from the guide rod of the distribution transformer neutral line.After the neutral line disconnects, if the threephase load imbalance of user side will make the neutral point current potential bigger skew occur, in bigger one the going up load voltage mutually and significantly raise of impedance, cause power consumption equipment to burn very soon.Owing to also do not have the protective device at this type of fault at present, so neutral line open circuit fault causes bigger economic loss usually for electric power enterprise and user.
The utility model content
The purpose of this utility model is the drawback at prior art, and a kind of transformer neutral line broken circuit protecting equipment is provided, and prevents that power consumption equipment from burning because the neutral line opens circuit.
Problem described in the utility model realizes with following technical proposals:
A kind of transformer neutral line broken circuit protecting equipment; it comprises auxiliary relay, earth leakage protective device and audible-visual annunciator; the control coil of described auxiliary relay is connected between the phase line and the neutral line of distribution transformer low-pressure side through earth leakage protective device; the normally opened contact of auxiliary relay is serially connected in the control loop of main contactor of the comprehensive power distribution cabinet of transformer, is connected on after its normally-closed contact and audible-visual annunciator are connected in series between two phase lines of distribution transformer low-pressure side.
Above-mentioned transformer neutral line broken circuit protecting equipment, described audible-visual annunciator are connected in parallel by buzzer and alarm lamp and form.
The utility model utilizes auxiliary relay to monitor the break-make of the transformer neutral line in real time; when the neutral line disconnects; auxiliary relay cuts off the control loop of the main contactor of the comprehensive power distribution cabinet of transformer rapidly; power consumption equipment is separated with transformer; so effectively protected the safety of power consumption equipment, the economic loss of having avoided the neutral line to open circuit and cause to electric power enterprise and user.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is electrical schematic diagram of the present utility model.
Each list of reference numerals is among the figure: KA, auxiliary relay; the normally opened contact of KA-1, auxiliary relay; the normally-closed contact of KA-2, auxiliary relay; K, earth leakage protective device, SB, start button, FM, buzzer; L, alarm lamp; KM, main contactor, the main contacts of KM-1, main contactor, the auxiliary normally opened contact of KM-2, main contactor.
Embodiment
Referring to Fig. 1, this device can solve the neutral line and break suddenly, and the problem that JP cabinet (the comprehensive power distribution cabinet of distribution transformer) is failure to actuate.In case broken neutral line, this device can allow the coil losing electricity of the main contactor KM in the JP cabinet simultaneously, main contacts KM-1 discharges, and disconnects all circuit, the concurrent visual alarm of speaking.Because the interlocking of the main contactor KM in this device and the JP cabinet, so before the neutral line was not fixed a breakdown, this device was in guard mode all the time, at this moment main contactor KM can't adhesive, can prevent personnel's misoperation like this.Just can work when another characteristics of this device have only broken neutral line exactly, if daily maintenance, repair, this device is failure to actuate.
Principle:
This apparatus structure is simple; do not need to change the original layout of JP cabinet and device, only need to increase an earth leakage protective device K, an auxiliary relay KA and an audible-visual annunciator; the auxiliary normally opened contact KM-2 that cooperates the original main contactor KM in the JP cabinet more just can realize protection.
When equipment normally moves, the earth leakage protective device K that closes, auxiliary relay KA coil gets electric adhesive, the normally opened contact KA-1 closure of auxiliary relay KA, normally-closed contact KA-2 disconnects.Press the button SB(or combined air air cock this moment), the main contactor KM coil in the JP cabinet gets electric adhesive, its often open main contacts KM-1 closed and with the coil self-locking, this moment, circuit, equipment operation were normal, the audible-visual annunciator dead electricity.
When the guide rod place of the neutral line a bit opens circuit to certain that needs the protection circuit end; because circuit does not have the loop; auxiliary relay KA coil decompression and discharging; the auxiliary normally opened contact KA-1 of auxiliary relay KA disconnects; main contactor KM coil decompression discharges; disconnect self-locking, the normally-closed contact closure of auxiliary relay KA, audible-visual annunciator work.
After circuit was eliminated fault, auxiliary relay KA adhesive recovered normal condition again.
Claims (2)
1. transformer neutral line broken circuit protecting equipment; it is characterized in that; it comprises auxiliary relay (KA), earth leakage protective device (K) and audible-visual annunciator; the control coil of described auxiliary relay (KA) is connected between the phase line and the neutral line of distribution transformer low-pressure side through earth leakage protective device (K); the normally opened contact of auxiliary relay (KA-1) is serially connected in the control loop of main contactor (KM) of the comprehensive power distribution cabinet of transformer, is connected on after its normally-closed contact (KA-2) and audible-visual annunciator are connected in series between two phase lines of distribution transformer low-pressure side.
2. a kind of transformer neutral line broken circuit protecting equipment according to claim 1 is characterized in that, described audible-visual annunciator is connected in parallel by buzzer (FM) and alarm lamp (L) and forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320104960 CN203233139U (en) | 2013-03-08 | 2013-03-08 | Transformer neutral-wire break protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320104960 CN203233139U (en) | 2013-03-08 | 2013-03-08 | Transformer neutral-wire break protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203233139U true CN203233139U (en) | 2013-10-09 |
Family
ID=49289243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320104960 Expired - Fee Related CN203233139U (en) | 2013-03-08 | 2013-03-08 | Transformer neutral-wire break protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203233139U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065035A (en) * | 2014-06-26 | 2014-09-24 | 河南开启电力实业有限公司 | Distribution transformer neutral line breaking protection device |
| CN107192912A (en) * | 2017-07-14 | 2017-09-22 | 国网河南省电力公司濮阳供电公司 | Distribution box failure detector circuit |
-
2013
- 2013-03-08 CN CN 201320104960 patent/CN203233139U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065035A (en) * | 2014-06-26 | 2014-09-24 | 河南开启电力实业有限公司 | Distribution transformer neutral line breaking protection device |
| CN107192912A (en) * | 2017-07-14 | 2017-09-22 | 国网河南省电力公司濮阳供电公司 | Distribution box failure detector circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131009 Termination date: 20180308 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |