CN113030780A - 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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- CN113030780A CN113030780A CN202110151617.3A CN202110151617A CN113030780A CN 113030780 A CN113030780 A CN 113030780A CN 202110151617 A CN202110151617 A CN 202110151617A CN 113030780 A CN113030780 A CN 113030780A
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- 238000004088 simulation Methods 0.000 title claims abstract description 18
- 238000009413 insulation Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000012546 transfer Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000009666 routine test Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
Abstract
The invention belongs to the field of electric power, and particularly relates to a fault simulation device of a direct current system of a transformer substation. The technical scheme adopted by the invention has the following beneficial effects: 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 invention belongs to the field of electric power, and particularly relates to a fault simulation device for a direct current system of a 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.
Disclosure of Invention
In order to solve the technical problems, the invention adopts the following technical scheme:
a fault simulation device for a direct current system of a transformer substation comprises a direct current grounding module, an alternating current series-in module and a power supply module, wherein the direct current grounding module is connected with a direct current insulation detection device through interface switching 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 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.
Preferably, the power supply module includes a fuse connected to the L-side of the utility power in series, a first switch connected to the output end of the fuse, a second air switch connected between the first switch and the primary side of the transformer, a second switch connected between the first switch and the current measuring unit, and a third switch connected between the first switch and the voltage measuring unit.
The technical scheme adopted by the invention has the following beneficial effects:
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;
3. the transformer, the current measuring unit of the direct current grounding module and the voltage measuring unit of the alternating current series-connection module are powered by the power supply module, and the power supply safety is guaranteed through the first switch K1, the second air switch K2, the second switch K3, the third switch K4 and the fuse F.
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
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 fault simulation apparatus for a dc system of a transformer substation according to the present invention;
fig. 3 is a schematic structural diagram of an ac series module in the fault simulation apparatus for a dc system of a substation according to the present invention;
fig. 4 is a circuit diagram of a power supply module in the fault simulation apparatus for a dc system of a substation according to 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; 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-a first air switch; 4-power supply module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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 grounding module 2 connected to a dc insulation detection device 1 through interface switching for simulating a dc grounding fault, an ac series module 3 for simulating an ac series fault, and a power supply module 4 connected to the dc grounding module 2 and the ac series module 3 for supplying power.
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.
As shown in fig. 4, the power supply module 4 includes a fuse F connected in series with the commercial power L terminal, a first switch K1 connected to an output terminal of the fuse, a second air switch K2 connected between the first switch K1 and the primary side of the transformer, a second switch K3 connected between the first switch K1 and the current measuring unit, and a third switch K4 connected between the first switch K1 and the voltage measuring unit.
The transformer, the current measuring unit of the direct current grounding module and the voltage measuring unit of the alternating current series-connection module are powered by the power supply module, and the power supply safety is guaranteed through the first switch K1, the second air switch K2, the second switch K3, the third switch K4 and the fuse F.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. 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 fault simulation device of a direct current system of a transformer substation is characterized by comprising a direct current grounding module, an alternating current series-in module and a power supply module, wherein the direct current grounding module is connected with a direct current insulation detection device through interface switching 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 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.
6. The substation direct current system fault simulation device of claim 1, wherein the power supply module comprises a fuse connected in series with the L-terminal of the utility power, a first switch connected to the output terminal of the fuse, a second air switch connected between the first switch and the primary side of the transformer, a second switch connected between the first switch and the current measurement unit, and a third switch connected between the first switch and the voltage measurement unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110151617.3A CN113030780A (en) | 2021-02-03 | 2021-02-03 | Fault simulation device for direct current system of transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110151617.3A CN113030780A (en) | 2021-02-03 | 2021-02-03 | Fault simulation device for direct current system of transformer substation |
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| CN113030780A true CN113030780A (en) | 2021-06-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988621A (en) * | 2019-11-27 | 2020-04-10 | 国网福建省电力有限公司检修分公司 | Voltage offset simulation method for ultra-high voltage transformer substation direct current system under humid climate condition |
| CN113777518A (en) * | 2021-08-13 | 2021-12-10 | 国网浙江省电力有限公司嘉兴供电公司 | DC system insulation device on-line tester |
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| CN109839564A (en) * | 2019-03-13 | 2019-06-04 | 国家电网有限公司 | A kind of DC ground fault simulation box and method |
| CN110361623A (en) * | 2019-07-16 | 2019-10-22 | 北京四方继保自动化股份有限公司 | A kind of small resistance operation/cutting method of MTDC transmission system single-point grounding fault location |
| CN110703141A (en) * | 2019-11-19 | 2020-01-17 | 国网青海省电力公司检修公司 | Direct current ground fault simulation box of transformer substation |
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2021
- 2021-02-03 CN CN202110151617.3A patent/CN113030780A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103500261A (en) * | 2013-10-22 | 2014-01-08 | 国家电网公司 | Method for fault simulation of direct current transmission system |
| CN103792505A (en) * | 2014-01-16 | 2014-05-14 | 国家电网公司 | Ground fault simulation device for electric power direct current system |
| CN204360672U (en) * | 2015-01-19 | 2015-05-27 | 国网冀北电力有限公司唐山供电公司 | A kind of substation equipment insulating ground failure simulation device |
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| CN109839564A (en) * | 2019-03-13 | 2019-06-04 | 国家电网有限公司 | A kind of DC ground fault simulation box and method |
| CN110361623A (en) * | 2019-07-16 | 2019-10-22 | 北京四方继保自动化股份有限公司 | A kind of small resistance operation/cutting method of MTDC transmission system single-point grounding fault location |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988621A (en) * | 2019-11-27 | 2020-04-10 | 国网福建省电力有限公司检修分公司 | Voltage offset simulation method for ultra-high voltage transformer substation direct current system under humid climate condition |
| CN113777518A (en) * | 2021-08-13 | 2021-12-10 | 国网浙江省电力有限公司嘉兴供电公司 | DC system insulation device on-line tester |
| CN113777518B (en) * | 2021-08-13 | 2024-03-01 | 国网浙江省电力有限公司嘉兴供电公司 | DC system insulation device on-line tester |
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