CN201733088U - Neutral point resistor cabinet of power transformer - Google Patents
Neutral point resistor cabinet of power transformer Download PDFInfo
- Publication number
- CN201733088U CN201733088U CN2010202747030U CN201020274703U CN201733088U CN 201733088 U CN201733088 U CN 201733088U CN 2010202747030 U CN2010202747030 U CN 2010202747030U CN 201020274703 U CN201020274703 U CN 201020274703U CN 201733088 U CN201733088 U CN 201733088U
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- resistor
- cabinet
- control switch
- controller
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Abstract
The utility model relates to a neutral point resistor cabinet of a power transformer, which is particularly applied to a power system with 6 to 35 KV cable lines. The technical scheme is as follows: the neutral point resistance cabinet comprises a high-value resistor (2), a low-value resistor (3), a control switch (4), a controller (5) and a current transformer (6), which are arranged in a closed cabinet body (1); the low-value resistor is connected in series with the control switch, and then connected in parallel with the high-value resistor; the two ends of the low-value resistor are guided out of the closed cabinet body; the current transformer is arranged on either end wire; the output of the current transformer is connected with the controller; and the control end of the controller is connected with the control switch. According to the neutral point resistor cabinet of the power transformer, the work mode of parallel connection of the high-value resistor (2) and the low-value resistor (3) achieves the effect of reducing the step voltage, suppressing the over-voltage, reducing the unnecessary line trip-out, improving the running quality of the power network and integrating the common benefits of the high-value resistance and the low-value resistance. The utility model is the ideal power equipment.
Description
Affiliated technical field:
The utility model relates to a kind of power transformer neutral resistor cabinet, is particularly useful for 6～35kV based on important power consumer power distribution network and power plant using electricity systems such as the urban power distribution network of cable line, large size industrial enterprise, factory, airport, harbour, subways.
Background technology:
Adopt in the distribution power-supply system of earth resistance, when nonmetal character ground connection is taken place, can reduce the overvoltage that perfects phase greatly.But general resistor box all adopts single low resistance; if the protective device action is untimely, the through-flow time of low resistance can be elongated, causes the generation of burning phenomenon of earth resistance through regular meeting; power network overvoltage be can cause, device damage, personal injury caused and than serious economy loss.
The utility model content:
The utility model purpose provides a kind of power transformer neutral resistor cabinet, and is safe and reliable, avoids fault, solves the problems referred to above that exist in the background technology.
The technical solution of the utility model is: a kind of power transformer neutral resistor cabinet comprises high resistance resistor, low values of resistors, control switch, controller, the current transformer that is arranged in the airtight cabinet, in parallel behind the low values of resistors serial connection control switch with high resistance resistor, draw respectively outside the airtight cabinet at two ends, one of them end line is provided with current transformer, the output of current transformer connects controller, and the control end of controller connects control switch.
The utility model also is provided with earthing device, cable lambda line termination, and the outer lead-out wire of airtight cabinet connects earthing device, cable lambda line termination respectively.
The utility model has used the design of high value resistor and low resistance parallel connection, plays the reduction step voltage, suppresses overvoltage, reduces unnecessary line tripping effect.
Realize being electrically connected by electric wire, cable or the copper bar of corresponding specification between the utility model all constituents.All component units are installed in the inner suitable position of airtight cabinet with bolt, and are solid and reliable.Airtight cabinet adopts the high sealing hierarchical organization, is applicable to places such as various indoor, open airs.
The beneficial effects of the utility model: according to the transformer neutral point resistor box of the utility model design, adopt the working method of high value resistor and low resistance parallel connection, reach the reduction step voltage, suppress overvoltage, reduce unnecessary line tripping, improving the operation of power networks quality, have the common advantage of high value resistor and low resistance concurrently, is a kind of multiple functional desirable power equipment.
Description of drawings:
Accompanying drawing is the utility model example structure schematic diagram;
1. airtight cabinets among the figure, 2. high resistance resistor, 3. low values of resistors, 4. control switch, 5. controller, 6. current transformer, 7. earthing device, 8. cable lambda line termination.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is described in further detail by embodiment.
In an embodiment, a kind of power transformer neutral resistor cabinet comprises high resistance resistor 2, low values of resistors 3, control switch 4, controller 5, the current transformer 6 that is arranged in the airtight cabinet 1, in parallel behind the low values of resistors serial connection control switch with high resistance resistor, draw respectively outside the airtight cabinet at two ends, one of them end line is provided with current transformer, the output of current transformer connects controller, and the control end of controller connects control switch.Also be provided with earthing device 7, cable lambda line termination 8, the outer lead-out wire of airtight cabinet connects earthing device, cable lambda line termination respectively.
The course of work: in normal operation, high value resistor 2 is connected with the neutral point of transformer by cable lambda line termination 8, and control switch 4 is in off-state.When the overvoltage that switching overvoltage or other reason cause occurring, produce when being not more than the earth current of 10A, high value resistor 2 can effectively suppress overvoltage, but and long-term work, the unlikely resistance that causes burns, and has reduced the earth potential rising, has reduced step voltage.When transient fault takes place,, can not cause line tripping even earth current has surpassed 10A yet.
When current transformer 6 records earth current is not instantaneous when surpassing 10A, controller 5 received current instrument transformers 6 signals, judge and fault occurred, and the output control signal is given control switch 4, control switch 4 closure immediately puts low resistance 3 into operation, eliminate superpotential generation, and, can improve the handling capacity of electric current owing to the effect in parallel of low resistance with high value resistor.After line tripping or the disappearance of overvoltage fault, when controller 5 records electric current less than 10A by current transformer 6, then disconnect control switch 4, recover normal operating conditions.
Claims (2)
1. power transformer neutral resistor cabinet, it is characterized in that comprising the high resistance resistor (2), low values of resistors (3), control switch (4), controller (5), the current transformer (6) that are arranged in the airtight cabinet (1), in parallel behind the low values of resistors serial connection control switch with high resistance resistor, draw respectively outside the airtight cabinet at two ends, one of them end line is provided with current transformer, the output of current transformer connects controller, and the control end of controller connects control switch.
2. the power transformer neutral resistor cabinet according to claim 1 is characterized in that also being provided with earthing device (7), cable lambda line termination (8), and the outer lead-out wire of airtight cabinet connects earthing device, cable lambda line termination respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202747030U CN201733088U (en) | 2010-07-29 | 2010-07-29 | Neutral point resistor cabinet of power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202747030U CN201733088U (en) | 2010-07-29 | 2010-07-29 | Neutral point resistor cabinet of power transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201733088U true CN201733088U (en) | 2011-02-02 |
Family
ID=43524244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202747030U Expired - Fee Related CN201733088U (en) | 2010-07-29 | 2010-07-29 | Neutral point resistor cabinet of power transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201733088U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932101A (en) * | 2019-11-10 | 2020-03-27 | 何菊明 | Box-type substation step voltage early warning protection device and use method |
-
2010
- 2010-07-29 CN CN2010202747030U patent/CN201733088U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932101A (en) * | 2019-11-10 | 2020-03-27 | 何菊明 | Box-type substation step voltage early warning protection device and use method |
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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: 20110202 Termination date: 20130729 |