CN214954009U - Fault simulation device for direct current system of transformer substation - Google Patents
Fault simulation device for direct current system of transformer substation Download PDFInfo
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- CN214954009U CN214954009U CN202120313819.9U CN202120313819U CN214954009U CN 214954009 U CN214954009 U CN 214954009U CN 202120313819 U CN202120313819 U CN 202120313819U CN 214954009 U CN214954009 U CN 214954009U
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Abstract
The utility model belongs to the electric power field, concretely relates to direct current system fault simulation device of transformer substation, include through interface switch with direct current insulation detection device be connected be used for simulating direct current ground fault's direct current ground connection module and be used for simulating the alternating current cluster and go into the module of going into of trouble. The utility model discloses a technical scheme, following beneficial effect has: 1. the simulation of the direct-current ground fault and the alternating-current series fault is realized by switching a direct-current grounding module used for simulating the direct-current ground fault and an alternating-current series module used for simulating the alternating-current series fault, which are connected with the direct-current insulation detection device, through an interface; 2. the resistance values of the direct current grounding module and the alternating current series-connection module can be adjusted, so that the manual connection of resistors 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 system fault simulation device 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 are mainly direct current grounding faults and alternating current series faults, the direct current grounding can cause the circuit breaker to be tripped mistakenly and refused to trip, and the alternating current intrusion can cause the switch to be tripped by direct action. And the alternating current can form a loop through the cable to ground capacitance, causing the circuit breaker to trip directly, the so-called "fault-free trip" of the protection.
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 fault simulation device of a direct current system of a transformer substation comprises a direct current grounding module and an alternating current series-in module, wherein the direct current grounding module is connected with a direct current insulation detection device through interface switching and is 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 resistance adjustment, and a second resistance adjusting unit connected with the first resistance adjusting unit and used for resistance adjustment, wherein the output end of the second resistance adjusting unit is grounded;
the alternating current series module comprises a transformer, a first change-over switch, a third resistance adjusting unit and a voltage measuring unit, wherein the first change-over switch is connected with the secondary side of the transformer and used for adjusting the output voltage of the transformer, one end of the third resistance adjusting unit is connected with the secondary side of the transformer, the other end of the third resistance adjusting unit is connected with the first change-over switch, one end of the voltage measuring unit is connected with one end of the third resistance adjusting unit, and the other end of the voltage measuring unit is connected with an adjusting end of the third resistance adjusting unit.
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 second 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 third 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 transfer switch comprises four first transfer sub-switches, which are respectively connected to outputs of the secondary side of the transformer at 6V, 12V, 24V and 36V.
Preferably, the ac series module further includes a first air switch connected to a primary side of the transformer.
The utility model discloses a technical scheme, following beneficial effect has:
1. the simulation of the direct-current ground fault and the alternating-current series fault is realized by switching a direct-current grounding module used for simulating the direct-current ground fault and an alternating-current series module used for simulating the alternating-current series fault, which are connected with the direct-current insulation detection device, through an interface;
2. the resistance values of the direct current grounding module and the alternating current series-connection module can be adjusted, so that the manual connection of resistors 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 fault simulation device of a dc system of a transformer substation according to the present invention;
fig. 2 is a schematic structural diagram of a dc grounding module in the dc system fault simulation apparatus of the transformer substation of the present invention;
fig. 3 is the utility model relates to a structural schematic diagram of module is gone into to exchange cluster among direct current system fault simulation device of transformer substation.
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; 3-alternating current is connected in series with the module; 31-a transformer; 32-a first transfer switch; 321-a first switch; 33-a third resistance adjustment unit; 34-a voltage measuring unit; 35-first air switch.
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 fault simulation device for a dc system of a substation includes a dc ground module 2 connected to a dc insulation detection device 1 through interface switching for simulating a dc ground fault, and an ac series module 3 for simulating an ac series fault.
In this embodiment, the dc ground module for simulating the dc ground fault and the ac series module for simulating the ac series fault, which are connected to the dc insulation detection device, are switched through the interface, so as to simulate the dc ground fault and the ac series fault.
In this embodiment, the resistance values of the dc grounding module and the ac series module are adjustable, so as to avoid manual connection of resistors with different resistance values, and prevent elements from falling or failing in the operation process.
As shown in fig. 2, the dc ground module 2 includes a current measuring unit 21 connected to the dc insulation detecting device 1, a first resistance adjusting unit 22 connected to the current measuring unit 21 for resistance adjustment, and a second resistance adjusting unit 23 connected to the first resistance adjusting unit 22 for resistance adjustment, wherein an output terminal of the second resistance adjusting unit 23 is grounded.
The first resistance adjusting unit 22 includes a plurality of first resistors 221 connected in series in sequence, two ends of each first resistor are respectively connected to the second switches 222 controlling the first resistors 221 to access, the second resistance adjusting unit 23 includes a plurality of second resistors 231 connected in series in sequence, and two ends of each second resistor 231 are respectively connected to the third switches 232 controlling the second resistors to access.
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 to 59k Ω can be realized through the switching of the second change-over switch and the third 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 ac serial module 3 includes a transformer 31, a first switch 32 connected to the secondary side of the transformer 31 for adjusting the output voltage of the transformer, a third resistance adjusting unit 33, and a voltage measuring unit 34, wherein one end of the third resistance adjusting unit 33 is connected to the secondary side of the transformer 31, the other end of the third resistance adjusting unit 33 is connected to the first switch 32, one end of the voltage measuring unit 34 is connected to one end of the third resistance adjusting unit 33, and the other end of the voltage measuring unit 34 is connected to the adjusting end of the third resistance adjusting unit 33.
In an embodiment, the first switch 32 includes four first switch sub-switches 321, which are respectively connected to outputs of the secondary sides 6V, 12V, 24V, and 36V of the transformer 31, so as to realize outputs of different voltages.
In an embodiment, the ac series module 3 further includes a first air switch 35 connected to the primary side of the transformer for controlling the connection of the transformer.
The alternating current series-connection module enables alternating current to change at 0-36V through output of the regulating transformer. The power frequency alternating current power supply is input through the connecting terminals of 'input L' and 'input N', and the voltage after being converted by the transformer can be adjusted at 4 grades of rated 6V, 12V, 24V and 36V through the first change-over switch; then, the third resistance adjusting unit of 100k omega is twisted to adjust the resistance value, thereby adjusting the voltage precision to make the output voltage of the module 'alternating current L' and 'alternating current N' terminal change in a specified range.
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 (5)
1. A fault simulation device of a direct current system of a transformer substation is characterized by comprising a direct current grounding module and an alternating current series-in module, wherein the direct current grounding module is connected with a direct current insulation detection device through interface switching and is 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 resistance adjustment, and a second resistance adjusting unit connected with the first resistance adjusting unit and used for resistance adjustment, wherein the output end of the second resistance adjusting unit is grounded;
the alternating current series module comprises a transformer, a first change-over switch, a third resistance adjusting unit and a voltage measuring unit, wherein the first change-over switch is connected with the secondary side of the transformer and used for adjusting the output voltage of the transformer, one end of the third resistance adjusting unit is connected with the secondary side of the transformer, the other end of the third resistance adjusting unit is connected with the first change-over switch, one end of the voltage measuring unit is connected with one end of the third resistance adjusting unit, and the other end of the voltage measuring unit is connected with an adjusting end of the third resistance adjusting unit.
2. The substation direct-current system fault simulation device according to claim 1, wherein the first resistance adjustment unit includes a plurality of first resistors connected in series in sequence, a second transfer switch for controlling the connection of the first resistors is connected to each of two ends of each first resistor, the second resistance adjustment unit includes a plurality of second resistors connected in series in sequence, and a third transfer switch for controlling the connection of the second resistors is connected to each of two ends of each second resistor.
3. The substation direct current system 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 system fault simulation device of claim 1, wherein the first transfer switch comprises four first transfer sub-switches respectively connected to outputs of 6V, 12V, 24V and 36V of the secondary side of the transformer.
5. The substation dc system fault simulator of claim 1, wherein the ac series-in module further comprises a first air switch connected to the primary side of the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120313819.9U CN214954009U (en) | 2021-02-03 | 2021-02-03 | Fault simulation device for direct current system of transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120313819.9U CN214954009U (en) | 2021-02-03 | 2021-02-03 | Fault simulation device for direct current system of transformer substation |
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| Publication Number | Publication Date |
|---|---|
| CN214954009U true CN214954009U (en) | 2021-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120313819.9U Active CN214954009U (en) | 2021-02-03 | 2021-02-03 | Fault simulation device for direct current system of transformer substation |
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| CN (1) | CN214954009U (en) |
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2021
- 2021-02-03 CN CN202120313819.9U patent/CN214954009U/en active Active
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