CN2453589Y - Device for warning the earthing of low voltage line - Google Patents
Device for warning the earthing of low voltage line Download PDFInfo
- Publication number
- CN2453589Y CN2453589Y CN 00245189 CN00245189U CN2453589Y CN 2453589 Y CN2453589 Y CN 2453589Y CN 00245189 CN00245189 CN 00245189 CN 00245189 U CN00245189 U CN 00245189U CN 2453589 Y CN2453589 Y CN 2453589Y
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- Prior art keywords
- relay
- model
- utility
- control unit
- low
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- 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 device for warning the earthing of a low voltage line, which comprises a casing, a detecting unit and a control unit, wherein the detecting unit is composed of a zero-sequence current mutual inductor L and a current relay I connected to the output of the zero-sequence current mutual inductor; the control unit comprises two branches; one branch is composed of a normally-open contact I[1-1]of the current relay I connected in series and an intermediate relay J; the other branch is composed of the normally-open contact J[1-1]of the intermediate relay connected in series J and an acoustic-optic device. The utility model has the characteristics of simple structure, low cost, operation without electricity in normal time, difficult damage, low failure rate, reliable action, etc. The utility model can be suitable for a three-phase transformer in a low voltage power supply system to use as a warning device of phase wire earthing.
Description
The utility model relates to a kind of electric monitoring device of using for transformer, can send the device of warning information during particularly a kind of low-tension transformer phase line ground connection.
The phase line ground connection of low-voltage circuit can make ground connection phase power consumption equipment cisco unity malfunction, and causes people and animals' casualty accident of getting an electric shock easily.Simultaneously, also can make transformer phase-deficient operation occur, find and fix a breakdown as failing for a long time, supply transformer will transship scaling loss.At present the device of using as low-tension transformer phase line ground protection is more, but effect is all not satisfactory in actual applications.Subject matter is, device mostly is electronic devices and components and constitutes, and charging operation is fragile during voltage ripple of power network at ordinary times, thunderstorm season spoilage extra-high-speed particularly, and faults itself is many, easily misoperation.
The purpose of this utility model is: a kind of new low-voltage circuit ground connection alarm device is provided, it have simple in structure, at ordinary times not charging operation, not fragile, failure rate is low, the characteristics of reliable in action.
The utility model is achieved in that a kind of low-voltage circuit ground connection alarm device, and it comprises housing, detecting unit and control unit; It is characterized in that: detecting unit constitutes by zero sequence current mutual inductor L with current relay I that its output is joined; Control unit comprises two branch roads that join with external power supply, and one is the normally opened contact I by the current relay I of serial connection
1-1Constitute with auxiliary relay J, another is by the normally opened contact J of the auxiliary relay J of serial connection
1-1Constitute with acousto-optical device.
Compared with the prior art, the utility model has adopted a kind of new circuit structure according to the characteristics of applied environment, and institute's electrical appliance correspondence is strong with adaptive capacity to environment, and device charging operation not at ordinary times.Have simple in structure, with low cost, at ordinary times not charging operation, not fragile, failure rate is low, the characteristics of reliable in action.Can be for the three-phase transformer in the low-voltage power supply system alarm device during as phase line ground connection use.
Below in conjunction with accompanying drawing concrete enforcement Fang Wuzuo of the present utility model is described in further detail.
Accompanying drawing 1 is an electrical block diagram of the present utility model.
Embodiment: a kind of low-voltage circuit ground connection alarm device, it comprises housing, detecting unit and control unit.As shown in Figure 1, detecting unit constitutes by zero sequence current mutual inductor L with current relay I that its output is joined; Control unit comprises two branch roads that join with external power supply, and one is the normally opened contact I by the current relay I of serial connection
1-1Constitute with auxiliary relay J, another is by the normally opened contact J of the auxiliary relay J of serial connection
1-1Constitute with acousto-optical device, in this example, acousto-optical device by and the loud speaker S that connects
1With indicator light S
2Constitute.In this example, the model of current relay I and auxiliary relay J is respectively LJ-31 and DJ-10.
When the ground connection situation took place for the phase line of transformer, earth current flowed back to the neutral point O point of transformer through the earth by the earth connection of transformer, and zero sequence current mutual inductor L detected earth current and delivered to current relay I this moment; When earth current reaches setting value, current relay action, its normally opened contact I
1-1Closure makes auxiliary relay J get electronic work, the normally opened contact J of auxiliary relay J
1-1Closure makes loud speaker S
1Indication, indicator light S sound
2Send the light indication, alarm to the staff.
Claims (1)
1, a kind of low-voltage circuit ground connection alarm device, it comprises housing, detecting unit and control unit; It is characterized in that: detecting unit constitutes by zero sequence current mutual inductor L with current relay I that its output is joined; Control unit comprises two branch roads that join with external power supply, and one is the normally opened contact I by the current relay I of serial connection
1-1Constitute with auxiliary relay J, another is by the normally opened contact J of the auxiliary relay J of serial connection
1-1Constitute with acousto-optical device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00245189 CN2453589Y (en) | 2000-11-20 | 2000-11-20 | Device for warning the earthing of low voltage line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00245189 CN2453589Y (en) | 2000-11-20 | 2000-11-20 | Device for warning the earthing of low voltage line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2453589Y true CN2453589Y (en) | 2001-10-10 |
Family
ID=33604723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00245189 Expired - Fee Related CN2453589Y (en) | 2000-11-20 | 2000-11-20 | Device for warning the earthing of low voltage line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2453589Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426318A (en) * | 2011-09-16 | 2012-04-25 | 宁夏电力公司石嘴山供电局 | Phase-wire grounding warner |
-
2000
- 2000-11-20 CN CN 00245189 patent/CN2453589Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426318A (en) * | 2011-09-16 | 2012-04-25 | 宁夏电力公司石嘴山供电局 | Phase-wire grounding warner |
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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 |