CN214409251U - Grounding fault alarm device for low-voltage side of transformer for high-temperature gas cooled reactor high-voltage station - Google Patents
Grounding fault alarm device for low-voltage side of transformer for high-temperature gas cooled reactor high-voltage station Download PDFInfo
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- CN214409251U CN214409251U CN202120077136.8U CN202120077136U CN214409251U CN 214409251 U CN214409251 U CN 214409251U CN 202120077136 U CN202120077136 U CN 202120077136U CN 214409251 U CN214409251 U CN 214409251U
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Abstract
The application relates to a grounding fault alarm device for a low-voltage side of a high-voltage station transformer of a high-temperature gas cooled reactor, which comprises a high-voltage sensor, a voltage comparator and a time delay alarm, wherein the high-voltage sensor CG5-10Q is arranged on each branch bus of a low-voltage side A, B of the high-voltage station transformer and used for monitoring the voltage of each branch bus of A, B, three-phase voltage lines of the high-voltage sensor are connected in parallel with two paths, and one path is connected with an intelligent monitoring device of a switch and used for a high-voltage electrified display function; and the other path is connected with a voltage comparator and is used for judging the single-phase earth fault. The utility model discloses an alarm device has effectively solved the technical problem that high temperature gas cooled piles transformer low pressure side branch single phase ground fault does not have the warning for factory.
Description
Technical Field
The utility model belongs to the technical field of electrician's electrical, concretely relates to high temperature gas cooled piles transformer low pressure side ground fault alarm device for high pressure plant.
Background
The power system can be divided into a large-current grounding system and a small-current grounding system according to the grounding mode of a neutral point, and the power distribution network in China adopts the mode that the neutral point is not directly grounded, and the mode is also called as the small-current grounding system. In various faults under the mode, a single-phase earth fault is the most common system fault, when the fault occurs, a non-fault phase voltage can be increased to a line voltage to cause system overvoltage, the fault is brought for a long time to operate, insulation damage is easily caused, arc short circuit grounding is generated, two-point earth faults are formed, and system safety is seriously influenced.
Generally, a single-phase ground fault can be timely discovered and processed through zero-sequence voltage acquired by a PT open delta winding. However, in a special operation mode, for example, in a transformer in a hot standby state, a low-voltage side branch bus of the transformer is often in the hot standby state for a long time, and if a PT of a transformer low-voltage side branch does not have an open triangular winding, when a single-phase ground fault occurs in the transformer low-voltage side branch, zero-sequence voltage cannot be acquired, so that a connection cable (or a busbar) between a transformer low-voltage side bushing and a downstream bus switch cabinet becomes a dead zone of a conventional voltage monitoring device, and potential safety hazards are brought to safe and stable operation of a power supply system.
The incoming line PT on the low-voltage side of the transformer for the high-voltage plant of the high-temperature gas cooled reactor demonstration project has no open triangular winding, and only the 6kV bus PT has the open triangular winding, so that the insulation condition of the branch bus on the low-voltage side of the transformer for the high-voltage plant cannot be monitored by using the open triangular winding of the incoming line PT on the low-voltage side of the transformer for the high-voltage plant, namely when the transformer for the high-voltage plant is hot-standby and the branch bus on the low-voltage side of the transformer for the high-voltage plant is single-phase grounded, no alarm information exists, and great potential safety hazard can be brought to stable operation of a unit. If the low-voltage side branch PT of the transformer for the high-voltage plant is replaced by the PT with the open triangular winding, the large modification in the aspect of electricity at one time is involved, the period of project establishment, purchase, installation and test is long, the influence on the field engineering progress is large, and the method is not suitable for being carried out in the engineering stage. Therefore, how to timely find the single-phase earth fault of the low-voltage side branch of the high-voltage station transformer of the high-temperature gas cooled reactor is a technical problem to be solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high temperature gas cooled piles transformer low pressure side ground fault alarm device for high pressure plant can be when taking place single-phase earth fault, and the very first time is reported to the police to guarantee the safety and stability operation of transformer system for the high pressure plant.
When the transformer for the high-voltage plant is in hot standby, a common-box bus between a low-voltage side sleeve of the transformer for the high-voltage plant and a 6kV bus switch cabinet is a dead zone of traditional voltage monitoring, and a high-temperature gas cooled reactor demonstrates that an inlet wire PT of a branch bus at the low-voltage side of the transformer for the high-voltage plant of an engineering has no open triangular winding, so that the condition of single-phase grounding of the branch bus at the low-voltage side of the transformer for the high-voltage plant cannot be monitored by adopting zero-sequence voltage measured by the PT open triangular winding commonly used in the industry.
In order to thoroughly stop the monitoring blind spot and demonstrate the potential safety hazard that the transformer operation brought with the high-pressure plant of engineering was piled to the high temperature gas cooled, solve the technical problem that high temperature gas cooled piles transformer low pressure side branch list and ground trouble was in time discovered, the utility model provides a following technical scheme:
the utility model provides a high temperature gas cooled reactor high pressure station transformer low pressure side ground fault alarm device which characterized in that: the device comprises a high-voltage sensor, a voltage comparator and a time delay alarm, wherein the high-voltage sensors CG5-10Q are arranged on branch buses at A, B on the low-voltage side of the high-voltage station transformer and used for monitoring the voltage of A, B branch buses, three-phase voltage lines of the high-voltage sensors are connected in parallel, and one line is connected with an intelligent monitoring device of a switch and used for a high-voltage electrified display function; the other path is connected with a voltage comparator and is used for judging the single-phase earth fault; the preset voltage value and the delay time of the voltage comparator are preset.
Further, the preset voltage value is 1.2 times of the fixed value of the phase voltage.
Further, the delay time is 2 min.
Furthermore, the time delay alarm is a buzzer alarm.
Further, high-voltage sensors on the low-voltage side A, B of the high-voltage service transformer are connected to respective voltage comparators for insulation monitoring and single-phase ground fault judgment of A, B branch buses.
The utility model discloses improve prior art, utilize the high pressure live sensor that sets up on the high temperature gas cooled reactor transformer low pressure side A, B each branch generating line for high pressure plant, through the voltage comparator, the magnitude of voltage and the single-phase earth fault that gather high pressure live sensor predetermine the magnitude of voltage and compare, the magnitude of voltage when gathering is greater than predetermineeing the magnitude of voltage, exceed the delay time definite value back simultaneously, relevant relay action, the buzzer reports to the police, convey alarm signal to DCS simultaneously, thereby the realization monitors the zero sequence voltage of high pressure plant transformer low pressure side A, B each branch generating line.
The utility model has the advantages that:
the utility model discloses utilize the high voltage live sensor who sets up on each branch generating line of transformer low pressure side A, B for the high pressure plant, carry out voltage comparison through voltage comparator, be greater than preset voltage value when the voltage value who gathers, exceed the delay time definite value simultaneously after, relevant relay action, buzzer warning is to DCS conveying alarm signal simultaneously to the realization is to the monitoring of the transformer low pressure side branch generating line single-phase earth fault condition for the high pressure plant. The problem of monitoring the blind spot is solved, can inform the operating personnel the operating mode of high-voltage station transformer low-voltage side branch bus in the very first time, in case single-phase earth fault takes place, can take precautionary measure the very first time, avoid the expansion and the power failure of accident, guarantee the safe and stable operation of high-voltage station transformer system.
Drawings
FIG. 1 is a wiring diagram of an exemplary engineering high-voltage station transformer of a high-temperature gas-cooled reactor.
Fig. 2 is a schematic diagram of the detection principle of the branch single-phase earth fault of the low-voltage side of the high-voltage station transformer.
Reference numerals: 1. a high voltage station transformer; 2. A high voltage charge sensor; 3. A voltage comparator; 4. A time delay alarm; 5. 6021 switching; 6. 6022 switching; 7. A section A of branch bus; 8. b section branch bus
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The following description of the embodiments is made with reference to the accompanying drawings 1 and 2:
as shown in the figure, the alarm device for the single-phase ground fault of each branch bus on the low-voltage side A, B of the high-voltage station transformer of the high-temperature gas cooled reactor comprises a high-voltage sensor 2, a voltage comparator 3 and a time delay alarm 4, wherein the high-voltage sensor 2 is arranged on each branch bus on the low-voltage side A, B of the high-voltage station transformer 1 and is used for monitoring the voltage of each branch bus A, B.
Connecting a three-phase voltage line of the high-voltage sensor 2 into a terminal block, connecting two lines in parallel in the terminal block, and sending one line to an intelligent switch monitoring device for a high-voltage live display function; the other path is sent to a voltage comparator 3 for judging the single-phase earth fault.
A voltage comparator 3 and a delay alarm 4 are installed in a secondary cabin of a PT cabinet with an incoming line at the 6kVA section and the B section, and the voltage comparator 3 has the functions of voltage comparison and action delay. When single-phase grounding occurs in a system without grounding at a neutral point, the fault phase voltage is changed into 0, and the non-fault phase voltage is increased to
Multiplying, i.e. raising to line voltage, the basic principle, referred to the power system field operating experience, when the phase voltage exceeds the rated phase voltage by 1.2 times and lasts for 2And min, judging as a permanent ground fault. Therefore, the preset voltage value of the voltage comparator 3 is set to be 1.2 times of the phase voltage, and the delay time is 2 min.
When a single-phase earth fault occurs, the non-fault phase voltage rises
And if the time exceeds 2min, the action is output, and the delay alarm 4 sends out a single-phase earth fault alarm.
Further, the delay alarm 4 is a buzzer alarm.
Further, high-voltage sensors on branch incoming lines PT of the low-voltage side A, B of the high-voltage station transformer are connected to respective voltage comparators 3, and are used for insulation monitoring and single-phase ground fault judgment of branch buses A, B.
It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a high temperature gas cooled reactor high pressure station transformer low pressure side ground fault alarm device which characterized in that: the device comprises a high-voltage sensor (2), a voltage comparator (3) and a time delay alarm (4), wherein the high-voltage sensor (2) is arranged on each branch bus line of the low-voltage side A, B of the high-voltage station transformer (1) and used for monitoring incoming line voltage, three-phase voltage lines of the high-voltage sensor (2) are connected in parallel, and one line is connected with an intelligent switch monitoring device and used for displaying the high-voltage electrified state; the other path is connected with a voltage comparator (3) and is used for judging the single-phase earth fault; the preset voltage value and the delay time of the voltage comparator (3) are set in advance.
2. The warning device of claim 1, wherein: the preset voltage value is 1.2 times of the fixed value of the phase voltage.
3. The warning device of claim 2, wherein: the delay time is 2 min.
4. The warning device of claim 1, wherein: the delay alarm (4) is a buzzer alarm.
5. The warning device of claim 1, wherein: the high-voltage sensors on the low-voltage side A, B of the high-voltage station transformer are connected to respective voltage comparators (3) and used for insulation monitoring and single-phase earth fault judgment of A, B branch buses.
6. The warning device of claim 5, wherein: the model of the high-voltage sensor is CG 5-10Q.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120077136.8U CN214409251U (en) | 2021-01-12 | 2021-01-12 | Grounding fault alarm device for low-voltage side of transformer for high-temperature gas cooled reactor high-voltage station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120077136.8U CN214409251U (en) | 2021-01-12 | 2021-01-12 | Grounding fault alarm device for low-voltage side of transformer for high-temperature gas cooled reactor high-voltage station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214409251U true CN214409251U (en) | 2021-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120077136.8U Active CN214409251U (en) | 2021-01-12 | 2021-01-12 | Grounding fault alarm device for low-voltage side of transformer for high-temperature gas cooled reactor high-voltage station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214409251U (en) |
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2021
- 2021-01-12 CN CN202120077136.8U patent/CN214409251U/en active Active
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