CN202749793U - Independent power supply safety protection system of distribution transformer - Google Patents
Independent power supply safety protection system of distribution transformer Download PDFInfo
- Publication number
- CN202749793U CN202749793U CN 201220368203 CN201220368203U CN202749793U CN 202749793 U CN202749793 U CN 202749793U CN 201220368203 CN201220368203 CN 201220368203 CN 201220368203 U CN201220368203 U CN 201220368203U CN 202749793 U CN202749793 U CN 202749793U
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- distribution transformer
- voltage side
- protection system
- safety protection
- power supply
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Abstract
The utility model discloses an independent power supply safety protection system of a distribution transformer. The independent power supply safety protection system of the distribution transformer is mainly used for 1140/380 volts distribution transformers. The protection system comprises a leakage protector, wherein 1140 volts high voltage side coil A, B and C three phases of the distribution transformer are connected in a Y-shaped mode, and 380 volts low voltage side coil a, b and c three phases of the distribution transformer are connected in a Y-shaped mode. An outgoing line from a neutral point on the 380 volts low voltage side is connected to the ground. The 380 volts low voltage side coil a, b and c three phases and a null line n are connected with a load through the leakage protector. An insulation supervising device is connected between the leakage protector and the load. The outgoing line from the neutral point on the 380 volts low voltage side is connected with one end of neutral point electric resistance, and the other end of the neutral point electric resistance is connected to the ground. According to the independent power supply safety protection system of the distribution transformer, the insulation supervising device is installed inside the distribution transformer and is matched with the leakage protector for using, and thus, multilevel safety protection is achieved, safety performance is greatly enhanced and personal safety of staff can be guaranteed.
Description
Technical field
The utility model relates to the protection system of transformer, especially relates to a kind of distribution transformer independent current source safety system, is mainly used in the distribution transformer of 1140/380V.
Background technology
At present, the petroleum industry production scene uses the 1140/380V distribution transformer to provide electric energy for various field work machineries.And to the realization of 1140/380V distribution transformer " three greatly protections ", i.e. overcurrent protection, earth leakage protective and ground protection.Current protection uses the size of current value as the protection operation condition, can not be as personal electrical shock protection.Earth leakage protective uses earth leakage protective device to be connected between 1140/380V distribution transformer and the power consumption equipment, exists sensitivity to be subjected to the defective of earth resistance restriction.Ground protection adopts the directly grounded protected mode of neutral lead, can exist under certain condition to lose earth point, causes the problem without ground protection.Defects makes existing 1140/380V distribution transformer have potential safety hazard.
Summary of the invention
The purpose of this utility model provides a kind of distribution transformer independent current source safety system; improve the defencive function of 1140/380V transformer; when transformer generation earth fault or human electric shock; in time cut off the electricity supply; restriction is to the infringement of human body; as much as possible avoid the accident of getting an electric shock and dying, safeguard work personnel's personal safety.
The utility model is achieved in that a kind of distribution transformer independent current source safety system, comprise earth leakage protective device, the 1140v high-pressure side loop A of distribution transformer, B, C three-phase adopt Y shape to connect, its 380v low-voltage side coil a, b, c three-phase adopt Y shape to connect, by the lead-out wire ground connection of 380v low-pressure side neutral point; 380v low-voltage side coil a, b, c three-phase and zero line n are connected to load through earth leakage protective device; Be connected insulating monitor between earth leakage protective device and load, the lead-out wire of 380v low-pressure side neutral point is connected with an end of neutral resistor, by the other end ground connection of neutral resistor.
Compared with prior art; the utlity model has following useful effect: the utility model increases transformer 380v low-pressure side neutral resistor; neutral resistor is set between 0.8k Ω-1.2k Ω; behind the human electric shock; its leakage current will be above 30mA, and earth leakage protective device can action message, and human electric shock's electric current is much smaller than the non-resistance system; limit the infringement to human body, as much as possible avoided the accident of getting an electric shock and dying.The utility model is the installing insulating supervisory device in distribution transformer, is used with earth leakage protective device.The control of earth leakage protective device operate time meets the regulation of GB6829-1986.For operate time＜0.1 of final stage earth leakage protective action second.Insulating monitor acousto-optic warning function, and the residual voltage setting value can be adjusted.The utility model has been realized the multilevel security protection, and security performance significantly improves, personal safety that can the safeguard work personnel.
Description of drawings
Accompanying drawing 1 is fundamental diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further detailed description: a kind of distribution transformer independent current source safety system comprises earth leakage protective device 3, the 1140v high-pressure side loop A of distribution transformer 1, B, C three-phase adopt Y shape to connect, its 380v low-voltage side coil a, b, c three-phase adopt Y shape to connect, by the lead-out wire ground connection of 380v low-pressure side neutral point; 380v low-voltage side coil a, b, c three-phase and zero line n are connected to load 5 through earth leakage protective device 3.Be connected insulating monitor 4 between earth leakage protective device 3 and load 5, the lead-out wire of 380v low-pressure side neutral point is connected with an end of neutral resistor 2, by the other end ground connection of neutral resistor 2.The resistance value of neutral resistor 2 is set between 0.8k Ω-1.2k Ω, such as 1k Ω etc.Behind the human electric shock, its leakage current will be above 30mA, and earth leakage protective device 3 can action message.When single-phase electric shock accidents occured, fault current consisted of the loop through human body, the earth, neutral resistor 2, fault phase.Because the neutral resistor 2 of in the loop 0.8k Ω-1.2k Ω being installed can be limited in shock current in the safe range.Simultaneously earth leakage protective device 3 actions, rapidly disengagement failure circuit.Whether insulating monitor 4 has Grounding in order to detect phase line, can interrogate speed and cut off the electricity supply when single phase ground fault occurs.
Claims (2)
1. distribution transformer independent current source safety system, comprise earth leakage protective device (3), the 1140v high-pressure side loop A of distribution transformer (1), B, C three-phase adopt Y shape to connect, its 380v low-voltage side coil a, b, c three-phase adopt Y shape to connect, by the lead-out wire ground connection of 380v low-pressure side neutral point; 380v low-voltage side coil a, b, c three-phase and zero line n are connected to load (5) through earth leakage protective device (3); it is characterized in that between earth leakage protective device (3) and load (5), being connected insulating monitor (4); the lead-out wire of 380v low-pressure side neutral point is connected with an end of neutral resistor (2), by the other end ground connection of neutral resistor (2).
2. a kind of distribution transformer independent current source safety system according to claim 1 is characterized in that the resistance value of neutral resistor (2) is set between 0.8k Ω-1.2k Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220368203 CN202749793U (en) | 2012-07-28 | 2012-07-28 | Independent power supply safety protection system of distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220368203 CN202749793U (en) | 2012-07-28 | 2012-07-28 | Independent power supply safety protection system of distribution transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202749793U true CN202749793U (en) | 2013-02-20 |
Family
ID=47709145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220368203 Expired - Fee Related CN202749793U (en) | 2012-07-28 | 2012-07-28 | Independent power supply safety protection system of distribution transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202749793U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611313A (en) * | 2019-10-10 | 2019-12-24 | 广东华邦创科智能技术有限公司 | Three-phase four-wire AC power frequency intelligent protection safety power supply |
-
2012
- 2012-07-28 CN CN 201220368203 patent/CN202749793U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611313A (en) * | 2019-10-10 | 2019-12-24 | 广东华邦创科智能技术有限公司 | Three-phase four-wire AC power frequency intelligent protection safety power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130220 Termination date: 20130728 |