CN108549044B - Insulation line selection tester for direct current system of transformer substation - Google Patents
Insulation line selection tester for direct current system of transformer substation Download PDFInfo
- Publication number
- CN108549044B CN108549044B CN201810260627.9A CN201810260627A CN108549044B CN 108549044 B CN108549044 B CN 108549044B CN 201810260627 A CN201810260627 A CN 201810260627A CN 108549044 B CN108549044 B CN 108549044B
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- direct current
- wire clamp
- grounding
- jack
- bus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention relates to the technical field of maintenance of a direct current system of a transformer substation, in particular to an insulating line selection tester of the direct current system of the transformer substation, which comprises a grounding bus switching circuit, a wire clamp conduction detection circuit and a grounding current control circuit which are sequentially connected, wherein the grounding bus switching circuit takes electricity from a direct current bus through a telescopic wire; the wire clamp conduction detection loop comprises a plurality of wire clamp jacks, and a first wire clamp connected with the leakage current sensor can be inserted into the wire clamp jacks; the grounding current control loop comprises a grounding jack, and a second wire clamp connected with a grounding copper bar of the direct current feeder cabinet can be inserted into the grounding jack; an adjustable resistor is connected between the grounding bus switching circuit and the wire clamp conduction detection circuit; and an adjustable resistor is connected between the grounding bus switching circuit and the wire clamp conduction detection circuit. According to the invention, the direct current bus and the leakage current sensor do not need to be contacted for multiple times in the test process, so that the test risk can be reduced, the working efficiency can be improved, and the safe power taking can be realized; and the portable electronic device is simple in structure, easy to manufacture, small in occupied space and good in portability.
Description
Technical Field
The invention relates to the technical field of maintenance of a direct current system of a transformer substation, in particular to an insulation line selection tester of the direct current system of the transformer substation.
Background
The direct current system is an important component of the safe operation of the transformer substation. The insulation line selection of the direct current system of the transformer substation is an important ring in direct current fixed inspection work, and can effectively check that an insulation monitoring device installed in the direct current system can correctly alarm when the insulation of a direct current load branch circuit is reduced. At present, homemade simple grounding test wires are adopted in the team direct current fixed inspection work, the direct current buses are required to be contacted for many times in the test process, the test wires penetrate through narrow branch electric leakage CT, the risk of the test process is high, and the working efficiency is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a transformer substation direct current system insulation line selection tester, which utilizes a change-over switch to realize the selection of a grounding bus and adjusts the grounding bus in parallel by a ground resistor, so that the transformer substation direct current system insulation line selection test efficiency is improved, the risk of mistakenly touching the direct current bus in the test process is reduced, and the personal equipment safety is ensured.
In order to solve the technical problems, the invention adopts the following technical scheme:
the transformer substation direct current system insulation line selection tester comprises a positive direct current bus, a negative direct current bus and a direct current loop connected to the positive direct current bus and the negative direct current bus, wherein a plurality of leakage current sensors are arranged on positive and negative outgoing lines of the direct current loop in a surrounding mode; the insulation line selection tester comprises a grounding bus switching circuit, a wire clamp conduction detection circuit and a grounding current control circuit which are sequentially connected, wherein the grounding bus switching circuit takes electricity from a direct current bus through a telescopic wire; the wire clamp conduction detection loop comprises a plurality of wire clamp jacks, and a first wire clamp connected with the leakage current sensor can be inserted into the wire clamp jacks; the grounding current control loop comprises a grounding jack, and a second wire clamp connected with a grounding copper bar of the direct current feeder cabinet can be inserted into the grounding jack; an adjustable resistor is connected between the grounding bus switching circuit and the wire clamp conduction detection circuit.
According to the insulation line selection tester for the direct current system of the transformer substation, disclosed by the invention, an insulation line selection experiment is carried out by using a leakage current injection method, and the insulation condition of each branch of the direct current system can be primarily judged by detecting the output signals of the sensors of each branch: when the device operates, signals output by the leakage current sensor are detected in real time, and when the branch insulation condition is normal, the current flowing through the leakage current sensor is equal in magnitude and opposite in direction, and the output signals are zero; when the branch circuit is grounded, the leakage current sensor has a differential current flowing through, and the output of the leakage current sensor is not zero. According to the invention, the telescopic lead is used for taking electricity from the positive direct current bus or the negative direct current bus, the grounding bus switching loop is used for realizing the selection of the grounding bus, the grounding bus is inserted into the wire clamp jack through the first wire clamp to be connected with the leakage current sensor, the grounding current passes through the leakage current sensor of each direct current branch, and the grounding current is regulated by the adjustable resistor, so that the test requirement of insulation line selection of the direct current system is met; according to the invention, the direct current bus and the leakage current sensor do not need to be contacted for multiple times in the test process, so that the test risk can be reduced, the working efficiency can be improved, and the safe electricity taking can be realized.
Further, the grounding bus switching circuit comprises a single-pole three-throw switch, and the single-pole three-throw switch comprises a stationary end, a first contact which is grounded by conducting the analog positive direct current bus with the stationary end, a second contact which is conducted by conducting the test wire clamp with the stationary end, and a third contact which is grounded by conducting the analog negative direct current bus with the stationary end. The working modes of the insulation line selection test device can be rapidly switched through the arrangement of the single-pole three-throw switch, and the working modes are respectively as follows: the mode of simulating positive direct current bus grounding, the mode of testing the wire clamp conduction detection loop and the mode of simulating negative direct current bus grounding.
Further, a first jack is arranged between the first contact and the positive direct current bus, a second jack is arranged between the third contact and the negative direct current bus, and a third wire clamp for conducting a grounding bus switching loop can be inserted into each of the first jack and the second jack. The third wire clamp is inserted into the first jack and the second jack to be communicated with the positive direct current bus and the negative direct current bus, so that the operation is not required to contact the direct current bus for multiple times, and the safety risk in the test process can be reduced.
Further, the wire clamp conduction detection loop comprises a plurality of detection branches used for detecting whether the first wire clamp is closed well or not, and the detection branches are connected in parallel. Before the insulation line selection operation is carried out, whether the first line clamp is closed well is detected, the accuracy of insulation line selection is improved, and whether the function of insulation line selection is complete is effectively verified.
Further, the wire clamp conduction detection loop comprises three groups of detection branches, and is suitable for insulating wire selection of a three-phase three-wire circuit.
Further, the detection branch comprises a power supply, a switch, a first branch and a second branch which are connected in parallel with the power supply and the two ends of the switch, and the wire clamp jack comprises a first wire clamp jack arranged on the first branch and a second wire clamp jack arranged on the second branch.
Further, the first branch comprises a first resistor and a first indicator light which are connected in series, and the second branch comprises a second resistor and a second indicator light which are connected in series. When the switch is closed, the first wire clamp is inserted into the first wire clamp jack and closed, and the first indicator light is on to indicate that the first wire clamp of the first branch is completely closed; when the first wire clamp is inserted into the second wire clamp jack and is closed, the second indicator light is on, and the first wire clamp of the second branch is completely closed.
Further, the two ends of the first wire clamp jack are provided with a first shorting switch for shorting the first wire clamp jack, and the two ends of the second wire clamp jack are provided with a second shorting switch for shorting the second wire clamp jack. When the first wire clamp jack or the second wire clamp jack is not needed, the first shorting switch or the second shorting switch is directly poked to short the corresponding wire clamp jack, and the first indicator lamp or the second indicator lamp is on.
Further, the grounding current control loop comprises a third indicator lamp used for indicating the grounding of the positive direct current bus and a fourth indicator lamp used for indicating the grounding of the negative direct current bus, and the third indicator lamp and the fourth indicator lamp are connected in parallel. When the grounding bus switching loop is switched to the positive direct current bus, the first indicator lamp is on; when the grounding bus switching loop is switched to the negative direct current bus, the second indicator lamp is on; the direct current bus is directly and intuitively connected with the grounding bus switching loop through the indicating lamp area.
Further, the third indicator light is a red indicator light, and the fourth indicator light is a blue indicator light. When the grounding bus switching circuit is switched to the positive direct current bus, the red indicator lamp is on; when the grounding bus switching loop is switched to the negative direct current bus, the blue indicator lamp is lighted; the direct current bus communicated with the grounding bus switching circuit can be distinguished through colors, and the method is convenient and visual.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, the telescopic lead is used for taking electricity from the positive direct current bus or the negative direct current bus, the grounding bus switching loop is used for realizing the selection of the grounding bus, the grounding bus is inserted into the wire clamp jack through the first wire clamp to be connected with the leakage current sensor, the grounding current passes through the leakage current sensor of each direct current branch, and the grounding current is regulated by the adjustable resistor, so that the test requirement of insulation line selection of the direct current system is met; in the test process, the direct current bus and the leakage current sensor do not need to be contacted for multiple times, the test risk is reduced, the working efficiency is improved, and safe electricity taking can be realized.
(2) Before the insulation line selection operation, the invention can effectively verify whether the function of insulation line selection is complete, and improve the accuracy of insulation line selection test.
Drawings
Fig. 1 is a schematic diagram of an insulation route selection tester for a direct current system of a transformer substation.
Detailed Description
The invention is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Example 1
As shown in fig. 1, in a first embodiment of the insulation line selection tester of the direct current system of the transformer substation, the direct current system of the transformer substation comprises a positive direct current bus 1, a negative direct current bus 2 and a direct current loop connected to the positive direct current bus 1 and the negative direct current bus 2, wherein a plurality of leakage current sensors are arranged on positive and negative outgoing lines of the direct current loop in a surrounding manner; the insulation line selection tester comprises a grounding bus switching circuit 3, a wire clamp conduction detection circuit 4 and a grounding current control circuit 5 which are sequentially connected, wherein the grounding bus switching circuit 3 takes electricity from a direct current bus through a telescopic wire; the wire clamp conduction detection loop 4 comprises a plurality of wire clamp jacks, and a first wire clamp connected with the leakage current sensor can be inserted into the wire clamp jacks; the grounding current control loop 5 comprises a grounding jack 51, and a second wire clamp connected with a grounding copper bar of the direct current feeder cabinet can be inserted into the grounding jack 51; an adjustable resistor 6 is connected between the grounding bus switching circuit 3 and the wire clamp conduction detection circuit 4.
In the implementation of the embodiment, the telescopic lead is used for taking electricity from the positive direct current bus 1 or the negative direct current bus 2, the grounding bus switching loop 3 is used for realizing the selection of the grounding bus, the grounding current is inserted into the wire clamp jack through the first wire clamp to be connected with the leakage current sensor, and the grounding current passes through the leakage current sensor of each direct current branch, so that the adjustable resistor is assisted in adjusting the grounding current, and the test requirement of the insulation line selection of the direct current system is met.
Specifically, the ground bus switching circuit 3 includes a single-pole three-throw switch, which includes a stationary end 31, a first contact 32 grounded to the stationary end conduction analog positive dc bus, a second contact 33 grounded to the stationary end conduction test wire clamp conduction detection circuit, and a third contact 34 grounded to the stationary end conduction analog negative dc bus; a first jack 35 is arranged between the first contact 32 and the positive direct current bus 1, a second jack 36 is arranged between the third contact 34 and the negative direct current bus 2, and a third wire clamp for conducting a grounding bus switching circuit can be inserted into both the first jack 35 and the second jack 36. The working modes of the insulation line selection test device can be rapidly switched through the arrangement of the single-pole three-throw switch, and the working modes are respectively as follows: the mode of simulating positive direct current bus grounding, the mode of testing the wire clamp conduction detection loop and the mode of simulating negative direct current bus grounding.
As shown in fig. 1, the wire clamp conduction detection loop 4 comprises three groups of detection branches for detecting whether the first wire clamp is closed well, and the three groups of detection branches are connected in parallel; the detection branch comprises a power supply, a switch 43, a first branch and a second branch which are connected in parallel with the power supply and the two ends of the switch, and the wire clamp jack comprises a first wire clamp jack 41 arranged on the first branch and a second wire clamp jack 42 arranged on the second branch; the first branch comprises a first resistor 44 and a first indicator lamp 45 connected in series, and the second branch comprises a second resistor 46 and a second indicator lamp 47 connected in series. When the switch is closed, the first wire clip is inserted into the first wire clip insertion hole and 41 is closed, the first indicator lamp 45 is on, so that the first wire clip of the first branch is completely closed; when the first wire clip is inserted into the second wire clip receptacle 42 and closed, the second indicator light 47 is illuminated, indicating that the first wire clip of the second branch is closed intact.
After the test of the wire clamp conduction detection loop is finished, the leakage current sensor to be tested is clamped by the first wire clamp, then the proper resistance value of the adjustable resistor 6 is regulated to 7KΩ -15 KΩ according to different direct current systems, the actual resistance value of the adjustable resistor 6 is measured by a universal meter, and the resistance value of the adjustable resistor 6 is regulated to the proper resistance value.
The ground current control circuit 5 includes a third indicator lamp 52 for indicating the ground connection of the positive dc bus and a fourth indicator lamp 53 for indicating the ground connection of the negative dc bus, and the third indicator lamp 52 and the fourth indicator lamp 53 are connected in parallel. The third indicator lamp 52 is a red indicator lamp, and the fourth indicator lamp 53 is a blue indicator lamp. When the grounding bus switching circuit is switched to the positive direct current bus, the red indicator lamp is on; when the grounding bus switching loop 3 is switched to the negative direct current bus 2, the blue indicator lamp is on; the direct current bus communicated with the grounding bus switching circuit can be distinguished through colors, and the method is convenient and visual.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (7)
1. The transformer substation direct current system insulation line selection tester comprises a positive direct current bus (1), a negative direct current bus (2) and a direct current loop connected to the positive direct current bus and the negative direct current bus, wherein a plurality of leakage current sensors are arranged on positive and negative outgoing lines of the direct current loop in a surrounding mode; the insulation line selection tester is characterized by comprising a grounding bus switching circuit (3), a wire clamp conduction detection circuit (4) and a grounding current control circuit (5) which are sequentially connected, wherein the grounding bus switching circuit (3) takes electricity from a direct current bus through a telescopic wire; the wire clamp conduction detection loop (4) comprises a plurality of wire clamp jacks, wherein a first wire clamp connected with the leakage current sensor can be inserted into the wire clamp jacks; the grounding current control loop (5) comprises a grounding jack (51), and a second wire clamp connected with a grounding copper bar of the direct current feeder cabinet can be inserted into the grounding jack (51); an adjustable resistor (6) is connected between the grounding bus switching loop (3) and the wire clamp conduction detection loop (4); the grounding bus switching circuit (3) comprises a single-pole three-throw switch, wherein the single-pole three-throw switch comprises a stationary end (31), a first contact (32) grounded with a stationary end conduction analog positive direct current bus, a second contact (33) conducted with a stationary end conduction test wire clamp conduction detection circuit and a third contact (34) grounded with a stationary end conduction analog negative direct current bus; a first jack (35) is arranged between the first contact (32) and the positive direct current bus (1), a second jack (36) is arranged between the third contact (34) and the negative direct current bus piece, and a third wire clamp for conducting a grounding bus switching loop can be inserted into each of the first jack (35) and the second jack (36); the wire clamp conduction detection loop (4) comprises a plurality of detection branches used for detecting whether the first wire clamp is closed well or not, and the detection branches are connected in parallel.
2. The insulation route selection tester for a direct current system of a transformer substation according to claim 1, wherein the wire clamp conduction detection loop comprises three groups of detection branches.
3. The insulation line selection tester for the direct current system of the transformer substation according to claim 1, wherein the detection branch comprises a power supply, a switch (43), and a first branch and a second branch which are connected to the power supply and two ends of the switch in parallel, and the wire clamp jack comprises a first wire clamp jack (41) arranged on the first branch and a second wire clamp jack (42) arranged on the second branch.
4. A substation direct current system insulation route selection tester according to claim 3, characterized in that the first branch comprises a first resistor (44) and a first indicator lamp (45) connected in series, and the second branch comprises a second resistor (46) and a second indicator lamp (47) connected in series.
5. A transformer substation direct current system insulation line selection tester according to claim 3, characterized in that two ends of the first line clamp jack (41) are provided with a first shorting switch (48) for shorting the first line clamp jack, and two ends of the second line clamp jack (42) are provided with a second shorting switch (49) for shorting the second line clamp jack.
6. The transformer substation direct current system insulation route selection tester according to any one of claims 1 to 5, characterized in that the ground current control loop (5) comprises a third indicator light (52) for indicating that a positive direct current bus is grounded and a fourth indicator light (53) for indicating that a negative direct current bus is grounded, the third indicator light (52) and the fourth indicator light (53) being connected in parallel.
7. The insulation route selection tester for the direct current system of the transformer substation according to claim 6, wherein the third indicator lamp (52) is a red indicator lamp, and the fourth indicator lamp (53) is a blue indicator lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810260627.9A CN108549044B (en) | 2018-03-27 | 2018-03-27 | Insulation line selection tester for direct current system of transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810260627.9A CN108549044B (en) | 2018-03-27 | 2018-03-27 | Insulation line selection tester for direct current system of transformer substation |
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| CN108549044A CN108549044A (en) | 2018-09-18 |
| CN108549044B true CN108549044B (en) | 2023-08-25 |
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Families Citing this family (1)
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| CN109655727A (en) * | 2019-01-14 | 2019-04-19 | 安徽猎塔电缆集团有限公司 | A kind of cable extruded insulation on-line checking tagging system |
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