CN214669519U - Direct current ground fault simulation device of transformer substation - Google Patents
Direct current ground fault simulation device of transformer substation Download PDFInfo
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- CN214669519U CN214669519U CN202120313816.5U CN202120313816U CN214669519U CN 214669519 U CN214669519 U CN 214669519U CN 202120313816 U CN202120313816 U CN 202120313816U CN 214669519 U CN214669519 U CN 214669519U
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- direct current
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- ground fault
- fault simulation
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Abstract
The utility model belongs to the field of electric power, in particular to a transformer substation direct current ground fault simulation device, which comprises a direct current ground module connected with a direct current insulation detection device and used for simulating direct current ground fault and a power supply module connected with the direct current ground module; the direct current grounding module comprises a current measuring unit connected with the direct current insulation detection device, a first resistance adjusting unit connected with the current measuring unit and used for accessing resistance value adjustment, and a second resistance adjusting unit connected with the first resistance adjusting unit and used for accessing resistance value adjustment, wherein the output end of the second resistance adjusting unit is grounded. The utility model discloses a technical scheme, following beneficial effect has: the first resistance adjusting unit and the second resistance adjusting unit are used for realizing the access of different resistances, so that the manual access of the resistances with different resistance values is avoided, and the falling or the failure of elements in the operation process is avoided.
Description
Technical Field
The utility model belongs to the electric power field, concretely relates to direct current ground fault analogue means of transformer substation.
Background
The direct current system of the transformer substation is power supply equipment for providing direct current power supply for signal equipment, protection, automatic devices, emergency lighting, emergency power supply and breaker opening and closing operations. The DC system is an independent power supply which is not influenced by the operation mode of the system and ensures that the backup power supply-storage battery continuously provides important equipment of the DC power supply under the condition of external AC interruption.
The direct current faults include direct current ground faults, the direct current ground faults can cause the circuit breaker to be tripped mistakenly and refused to trip, and the direct action tripping of the switch can be caused by the alternating current intrusion.
The direct current insulation detection device is used for detecting the insulation performance of a direct current system, the unbalanced current of the sensor is mainly used for calculating the insulation resistance of the system, and if the insulation resistance does not reach relevant standards, the equipment gives an alarm.
If the direct current insulation detection device needs to carry out routine tests, a maintainer is connected with an analog resistor in series or is added with an alternating current power supply to realize fault verification before work. If the components fall down or fail in the operation process, the direct current branch is directly grounded, huge fault current is generated, and great potential safety hazards exist.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model adopts the following technical scheme:
a transformer substation direct current grounding fault simulation device comprises a direct current grounding module and a power supply module, wherein the direct current grounding module is connected with a direct current insulation detection device and used for simulating direct current grounding faults;
the direct current grounding module comprises a current measuring unit connected with the direct current insulation detection device, a first resistance adjusting unit connected with the current measuring unit and used for accessing resistance value adjustment, and a second resistance adjusting unit connected with the first resistance adjusting unit and used for accessing resistance value adjustment, wherein the output end of the second resistance adjusting unit is grounded.
Preferably, the first resistance adjusting unit includes a plurality of first resistances that establish ties in proper order, and the both ends of every first resistance are connected respectively and are controlled the first change over switch that first resistance inserts, the second resistance adjusting unit includes a plurality of second resistances that establish ties in proper order, and the both ends of every second resistance are connected respectively and are controlled the second change over switch that second resistance inserts.
Preferably, the number of the first resistors is the ratio of the resistance value of the second resistor to the resistance value of the first resistor minus 1.
Preferably, the first resistance adjusting unit includes 9 first resistors having a resistance of 1k Ω, and the second resistance adjusting unit includes 5 second resistors having a resistance of 10k Ω.
Preferably, the power supply module includes a first switch connected to the commercial power output terminal and a second switch connected between the first switch and the current measuring unit.
Preferably, the power supply module further comprises a fuse connected between the mains output and the first switch.
The utility model discloses a technical scheme, following beneficial effect has:
1. the direct current grounding module comprises a current measuring unit connected with the direct current insulation detection device, a first resistance adjusting unit connected with the current measuring unit and used for being connected with a resistance value adjusting unit, and a second resistance adjusting unit connected with the first resistance adjusting unit and used for being connected with the resistance value adjusting unit, and different resistances are connected through the first resistance adjusting unit and the second resistance adjusting unit, so that the manual connection of the resistances with different resistance values is avoided, and the falling or the failure of elements in the operation process is avoided.
The specific technical solution and the advantages of the present invention will be described in detail in the following detailed description with reference to the accompanying drawings.
Drawings
The invention will be further described with reference to the accompanying drawings and specific embodiments:
fig. 1 is a schematic structural diagram of a dc ground fault simulation apparatus of a transformer substation according to the present invention;
fig. 2 is a schematic structural diagram of a dc ground module in the dc ground fault simulation apparatus of the present invention;
fig. 3 is a circuit diagram of a power supply module in a dc ground fault simulation apparatus of a substation of the present invention.
In the figure, 1-a dc insulation detection device; 2-a direct current grounding module; 21-a current measuring unit; 22-a first resistance adjustment unit; 23-a second resistance adjustment unit; and 3, a power supply module.
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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, a dc ground fault simulation apparatus for a substation includes a dc ground module 2 connected to a dc insulation detection apparatus 1 for simulating a dc ground fault, and a power supply module 3 connected to the dc ground module.
As shown in fig. 2, the dc grounding module 2 includes a current measuring unit 21 connected to the dc insulation detecting device, a first resistance adjusting unit 22 connected to the current measuring unit 21 and used for switching in resistance value adjustment, and a second resistance adjusting unit 23 connected to the first resistance adjusting unit 22 and used for switching in resistance value adjustment, wherein an output end of the second resistance adjusting unit 23 is grounded.
In this embodiment, the dc ground module includes a current measurement unit connected to the dc insulation detection device, a first resistance adjustment unit connected to the current measurement unit and used for accessing resistance adjustment, and a second resistance adjustment unit connected to the first resistance adjustment unit and used for accessing resistance adjustment, and the first resistance adjustment unit and the second resistance adjustment unit are used for accessing different resistances, thereby avoiding manual access of resistors with different resistances and avoiding dropping or failure of elements during operation.
The number of the first resistors is the ratio of the resistance value of the second resistor to the resistance value of the first resistor minus 1. In fig. 2, the resistance values of the first resistors are 1k Ω, the number of the first resistors is 9, the resistance values of the second resistors are 10k Ω, and the number of the second resistors is 5, so that the access of 0-59 k Ω can be realized through the switching of the first change-over switch and the second change-over switch.
Corresponding resistors are connected according to requirements to form a direct current loop of a direct current branch circuit-resistor-ground, a direct current system has ground fault, bus insulation is reduced, the direct current insulation detection device starts polling, and ground fault simulation is achieved through voltage change to ground.
As shown in fig. 3, the power supply module 3 comprises a first switch K1 connected to the mains output and a second switch K2 connected between the first switch K1 and the current measuring unit, with a fuse F connected between the mains output and the first switch K1.
The current measuring unit of the direct current grounding module supplies power through the power supply module, and the power supply module supplies power and is provided with the first switch, the second switch and the fuse F, so that the power supply safety is guaranteed.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (6)
1. A transformer substation direct current grounding fault simulation device is characterized by comprising a direct current grounding module and a power supply module, wherein the direct current grounding module is connected with a direct current insulation detection device and used for simulating direct current grounding faults;
the direct current grounding module comprises a current measuring unit connected with the direct current insulation detection device, a first resistance adjusting unit connected with the current measuring unit and used for accessing resistance value adjustment, and a second resistance adjusting unit connected with the first resistance adjusting unit and used for accessing resistance value adjustment, wherein the output end of the second resistance adjusting unit is grounded.
2. The substation direct-current ground fault simulation device of claim 1, wherein the first resistance adjustment unit comprises a plurality of first resistors connected in series in sequence, two ends of each first resistor are respectively connected with a first change-over switch for controlling the connection of the first resistor, the second resistance adjustment unit comprises a plurality of second resistors connected in series in sequence, and two ends of each second resistor are respectively connected with a second change-over switch for controlling the connection of the second resistor.
3. The substation direct current ground fault simulation device of claim 2, wherein the number of the first resistors is the ratio of the second resistor value to the first resistor value minus 1.
4. The substation direct current ground fault simulation device of claim 3, wherein the first resistance adjustment unit comprises 9 first resistors with a resistance of 1k Ω, and the second resistance adjustment unit comprises 5 second resistors with a resistance of 10k Ω.
5. The substation dc ground fault simulation apparatus of claim 1, wherein the power supply module comprises a first switch connected to the utility power output and a second switch connected between the first switch and the current measurement unit.
6. The substation dc ground fault simulation device of claim 5, wherein the power supply module further comprises a fuse connected between the utility power output and the first switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120313816.5U CN214669519U (en) | 2021-02-03 | 2021-02-03 | Direct current ground fault simulation device of transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120313816.5U CN214669519U (en) | 2021-02-03 | 2021-02-03 | Direct current ground fault simulation device of transformer substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214669519U true CN214669519U (en) | 2021-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202120313816.5U Active CN214669519U (en) | 2021-02-03 | 2021-02-03 | Direct current ground fault simulation device of transformer substation |
Country Status (1)
| Country | Link |
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| CN (1) | CN214669519U (en) |
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2021
- 2021-02-03 CN CN202120313816.5U patent/CN214669519U/en active Active
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