CN209707671U - Transformer station direct current system resistance test device over the ground - Google Patents
Transformer station direct current system resistance test device over the ground Download PDFInfo
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- CN209707671U CN209707671U CN201920207985.3U CN201920207985U CN209707671U CN 209707671 U CN209707671 U CN 209707671U CN 201920207985 U CN201920207985 U CN 201920207985U CN 209707671 U CN209707671 U CN 209707671U
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Abstract
The utility model discloses a kind of transformer station direct current system resistance test devices over the ground, including sequentially connected plug, switching switch, selection switch, measuring resistance, fuse and ground line, the switching is switched to be connect with the positive/negative of subject direct current branch, and positive/negative electricity is successively connected by selection switch, measuring resistance and fuse with substation ground network respectively carries out resistance test over the ground；It is described to select switch for single-chip microcontroller, one end of single-chip microcontroller exit relay normal opened contact is connect with measuring resistance respectively, other end parallel connection and switching switch connect, the single-chip microcontroller is controlled by remote signal, by being arbitrarily connected all the way in remote control command selective relay normal opened contact, the selection of resistance gear is realized.The utility model structure is simple, operational risk is low, manipulation is easy, circuit access is time-consuming short, is convenient for widely available application.
Description
Technical field
The utility model relates to electric power direct current system fields, and in particular to a kind of transformer station direct current system bus is electric over the ground
Resistance, branch resistance test device over the ground.
Background technique
The abnormal runnings such as direct current system insulation fault may cause breaker malfunction, tripping, protection supervisory equipment are restarted
State may result in fault spread, cause serious influence to power system power supply reliability.D.C. isolation monitoring device is
DC power system DC bus insulation against ground situation is monitored, reflection DC bus anode, cathode grounding resistance can be positioned and be connect
Earth fault branch and the on-line monitoring and alarm device for calculating fault branch grounding resistance；The maintenance of D.C. isolation monitoring device
It checks and accepts and lacks relevant device, conventional method is added by slide rheostat or single fixed resistance analog DC ground fault
South electric network " transforming plant DC power system technologies specification Q/CSG1203003- is not satisfied in resistance value range, the precision of resistance
2013 " what is required " accesses 1k Ω, 5k Ω, 10k Ω, 15k Ω, 25k Ω, 50k Ω, 300k Ω in anode and cathode respectively over the ground
Resistance " requirement.And safeguard measures, the empirical risk such as slide rheostat shortage earth leakage protective are larger.To be wanted according to regulation
The different resistance of access are sought, need all to carry out to disconnect line in each convert resistance, repetition disconnects line and takes considerable time, and every time
Convert resistance is required to measurement resistance value, and test efficiency is low.
Utility model content
Technical problem to be solved in the utility model is to overcome defect described above, provides a kind of transforming plant DC system
System insulation against ground experimental rig efficiently realizes direct current resistance test over the ground.
In order to solve the above technical problems, transformer station direct current system described in the utility model resistance test device over the ground, packet
Include sequentially connected plug, switching switch, selection switch, measuring resistance, fuse and ground line, the switching switch and subject
The positive/negative of direct current branch connects, and positive/negative electricity is respectively successively by selection switch, measuring resistance and fuse and power transformation
Earth mat of standing, which is connected, carries out resistance test over the ground；Described to select switch for single-chip microcontroller, the single-chip microcontroller outlet includes seven relays
Device, the measuring resistance by resistance value be 1k Ω, 5k Ω, 10k Ω, 15k Ω, 25k Ω, 50k Ω, 300k Ω seven measuring resistances
Sequence composes in parallel, one end of seven relay normally open contacts connect with seven measuring resistances respectively, the other end simultaneously
Connection is connected with switching switch, and the single-chip microcontroller is controlled by remote signal, selects seven relay normally opens by remote control command
It is arbitrarily connected all the way in contact, realizes the selection of resistance gear.
Further, each resistor power of measuring resistance described in the utility model is not less than 20W, and resistance value relative error is little
In 1%.
The utility model by with the matched plug of direct current branch connecting terminal, be inserted directly into direct current branch positive and negative electrode and connect
Positive and negative electricity is introduced the experimental rig by line terminals, is connect by switching switching positive and negative electrode, then by selection switch selection
Enter some resistance in measuring resistance, accesses substation ground network after fusing insurance.
The utility model provides resistance value standard, has the standard ground Work tool of safeguard measure, realizes substation with this
220V direct current system accesses ground resistance, and whether the precision for verifying Insulation Inspection Device for Direct-Current System meet the requirements, and can be with
Correctness, the direct current system of verifying insulation monitoring device route selection insulate the correctness of low warning function.
The utility model has the beneficial effects that
1, normative operation process realizes one one from scratch examined to Insulation Inspection Device for Direct-Current System
Process examines DC system insulating monitoring from now on and examination provides a set of feasible calibration equipment.
2, multichannel resistance test can be quickly accessed by effectively improving working efficiency and realizing the same circuit, when shortening test
Between, easy to operate, contact is reliable, greatly improves working efficiency.
3, reduce the traditional method of calibration operation of human cost and walk complicated, heavy workload, the utility model is direct current
System insulation monitoring provides experimental provision, is not required to take out stitches repeatedly, wiring, reduces human cost.
4, it prevents that person electric shock risk occurs during manual adjustment resistance, avoids adjusting resistance value mistake.
Detailed description of the invention
Fig. 1 is the attachment structure schematic diagram of the utility model；
Fig. 2 is the circuit diagram of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
Transformer station direct current system described in the utility model resistance test device, including sequentially connected plug 2, switching over the ground
Switch 3, selection switch 4, measuring resistance 5, fuse 6 and ground line 7, it is described switching switch 3 with subject direct current branch 1 just/
Cathode connection, positive/negative electricity are successively connected by the selection switch 4, measuring resistance 5 and fuse 6 with substation ground network respectively
It is logical to carry out resistance test over the ground；Described to select switch 4 for single-chip microcontroller, the single-chip microcontroller outlet includes seven relays, the mark
Quasi- resistance 5 by resistance value is 1k Ω, seven measuring resistances sequence of 5k Ω, 10k Ω, 15k Ω, 25k Ω, 50k Ω, 300k Ω are in parallel
Composition, one end of seven relay normally open contacts connect with seven measuring resistances 5 respectively, other end parallel connection with it is described
Switch switch 3 to connect, the single-chip microcontroller is controlled by remote signal, selects to appoint in seven relay normally open contacts by remote control command
Meaning is connected all the way, realizes the selection of resistance gear.
Further, each resistor power of measuring resistance 5 described in the utility model is not less than 20W, and resistance value relative error is not
Greater than 1%.
Embodiment: there are two metal ferrules for the plug 2, and two contact pins are Banana Type contact pin, can be inserted directly into wiring
Terminal screws hole and fixation, wiring process do not need to remove original direct current branch terminal connections；Contact pin is connect with two core cable line,
Positive and negative electricity is introduced into the resistance test device over the ground；Switch positive and negative electrode by switching switch 3, then is selected by selection switch 4
Some resistance in access measuring resistance 5 is selected, accesses substation ground network after overcurrent fuse 6.The switching switch 3 is hilted broadsword
Commutator, movable contact spring can be contacted with two contact a, b of switch respectively, and the contact a connects anode, and the contact b connects cathode, works as movable contact spring
The test of face ground resistance is carried out when contacting with the contact a, movable contact spring and the contact b carry out negative resistance test over the ground, guarantee only when contacting
There is one of positive and negative electrode to access circuit, positive and negative anodes is avoided to be shorted；Described to select switch 4 for single-chip microcontroller, single-chip microcontroller is exported by seven
A relay composition, seven relay normally open contact K1~K7One end respectively with seven measuring resistance R1~R7Connection, the other end
In parallel to connect with switching switch 3, which is controlled by remote signal, selects seven relay normally open contacts by remote control command
K1~K7In be arbitrarily connected all the way, such as: selection K1When closure, DC power supply is tested through resistance R1It is connected to ground, checks direct current system
The subject direct current branch resistance value and standard electric resistance value R over the ground on insulation monitoring device1Difference, the insulating monitoring can be verified
The precision of device realizes the selection of resistance gear；The measuring resistance 5 be by resistance value be 1k Ω, 5k Ω, 10k Ω, 15k Ω,
25k Ω, 50k Ω, 300k Ω seven measuring resistances sequence compose in parallel, with satisfaction " transforming plant DC power system technologies rule
Model Q/CSG1203003-2013 " related request, in order to which in 220V voltage, resistance is not burned out, the measuring resistance is selected
Select the resistance that power is not more than 1% not less than 20W, resistance value relative error；The fuse 6 is by overcurrent fuse structure
At fuse 6 makees electrical equipment short circuit or overload protection is used, series connection access ground line front end.
Carry out direct current branch over the ground resistance test when, plug 2 is inserted into direct current branch terminal to be measured, 7 connection of ground line becomes
Power station earth mat.Selection 3 movable contact spring of switch is first switched into contact a, successively the K of remote control selection conducting selection switch 41~K7Contact,
Direct current branch anode to be measured is just successively through 1k Ω, 5k Ω, 10k Ω, 15k Ω, 25k Ω, 50k Ω, 300k Ω electricity in measuring resistance 5
Resistance ground connection, pair of insulation monitoring device can be verified to ground resistance indicating value by comparing the branch in Insulation Inspection Device for Direct-Current System
Ground resistance precision.
Similarly, selection 3 movable contact spring of switch is switched into contact b, negative resistance test over the ground can be carried out.
The above is only some embodiments of the utility model, as long as having used structure described above, should all fall into this reality
With novel protection scope.
Claims (2)
1. a kind of transformer station direct current system resistance test device, including sequentially connected plug (2), switching switch (3), choosing over the ground
Select switch (4), measuring resistance (5), fuse (6) and ground line (7), which is characterized in that the switching switch (3) and subject are straight
The positive/negative connection of branch (1) is flowed, positive/negative electricity is respectively successively by selection switch (4), measuring resistance (5) and fuse
(6) be connected progress resistance test over the ground with substation ground network；It is described to select to switch (4) to be single-chip microcontroller, the single-chip microcontroller outlet
Including seven relays, the measuring resistance (5) is 1k Ω, 5k Ω, 10k Ω, 15k Ω, 25k Ω, 50k Ω, 300k by resistance value
Ω seven measuring resistances sequence compose in parallel, one end of seven relay normally open contacts respectively with seven standard electrics
Resistance (5) connection, other end parallel connection switch (3) with the switching and connect, and the single-chip microcontroller is controlled by remote signal, are ordered by remote control
It enables and being arbitrarily connected all the way in seven relay normally open contacts of selection, realize the selection of resistance gear.
2. transformer station direct current system resistance test device over the ground according to claim 1, which is characterized in that the measuring resistance
(5) each resistor power is not less than 20W, and resistance value relative error is not more than 1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920207985.3U CN209707671U (en) | 2019-02-19 | 2019-02-19 | Transformer station direct current system resistance test device over the ground |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920207985.3U CN209707671U (en) | 2019-02-19 | 2019-02-19 | Transformer station direct current system resistance test device over the ground |
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| CN209707671U true CN209707671U (en) | 2019-11-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526427A (en) * | 2020-11-27 | 2021-03-19 | 广东电网有限责任公司 | Auxiliary inspection device for direct current system of transformer substation |
| CN112858951A (en) * | 2021-03-18 | 2021-05-28 | 浙江浙能嘉华发电有限公司 | Direct current system feeder grounding test device |
| CN113589210A (en) * | 2021-08-27 | 2021-11-02 | 广东电网有限责任公司 | Portable grounding test device and method for DC power supply system for plant station |
-
2019
- 2019-02-19 CN CN201920207985.3U patent/CN209707671U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526427A (en) * | 2020-11-27 | 2021-03-19 | 广东电网有限责任公司 | Auxiliary inspection device for direct current system of transformer substation |
| CN112858951A (en) * | 2021-03-18 | 2021-05-28 | 浙江浙能嘉华发电有限公司 | Direct current system feeder grounding test device |
| CN113589210A (en) * | 2021-08-27 | 2021-11-02 | 广东电网有限责任公司 | Portable grounding test device and method for DC power supply system for plant station |
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