CN2722265Y - DC grounding on-line tester - Google Patents
DC grounding on-line tester Download PDFInfo
- Publication number
- CN2722265Y CN2722265Y CN 200420074691 CN200420074691U CN2722265Y CN 2722265 Y CN2722265 Y CN 2722265Y CN 200420074691 CN200420074691 CN 200420074691 CN 200420074691 U CN200420074691 U CN 200420074691U CN 2722265 Y CN2722265 Y CN 2722265Y
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- grounding
- transformer
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- circuit
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Abstract
The utility model relates to a DC grounding on-line tester, comprising a switch, a transformer and a resistor. The concrete structure is that the switch (1) is connected with the primary circuit of the transformer (2) in series; a compressor governor (3) is connected with the secondary circuit of the transformer (2) in series; the resistor (4), the adjustable resistor (5) are connected with the AC clip-on ammeter (6) in series after connecting with the secondary circuit (3) of the compressor governor (3) in series. The utility model is used for the DC grounding on-line testing of the monitoring or controlling equipment, such as transformer station. The DC grounding on-line tester is characterized in that the on-line testing can be operated without power cutting and grading; multipoint earthing can not be caused by the on-line testing, and meanwhile multipoint earthing can be found by the on-line testing. The DC grounding on-line tester has a wide testing range, and can test the direct current system of-220V,-110V and-48V. The DC grounding on-line tester also has the advantages of simple and safe operation, high sensibility and low product price.
Description
(1) technical field
The utility model relates to a kind of proving installation of DC circuit, is used in particular for supervisory control of substation or opertaing device on-line direct current earthing test instrument.
(2) background technology
When ground connection takes place in certain point of straight-flow system such as supervisory control of substation or a certain utmost point of opertaing device, though can not produce harm to equipment, but if 2 at the two poles of the earth are all after the ground connection, dc insurance fusing, direct supply are disappeared, cause monitoring or opertaing device malfunction, malfunctioning, make transformer station's control area large-area power-cuts.Traditional detection method is disconnected each DC loop of examination, but the working specification stipulated time can not surpass for 3 seconds, otherwise when circuit breaks down, can cause overstep tripping.Improper as if taking measures in search procedure in addition, the direct current dead electricity can cause the malfunction of protection aut.eq., causes direct-current short circuit or another ground connection.At present the detecting instrument that uses has ultralow audio frequency, frequency conversion detector etc., and it costs an arm and a leg and is difficult to accept for general enterprise.
(3) summary of the invention
The purpose of this utility model is to provide the DC earthing tester of a kind of low price, online detection simple to operate
For achieving the above object, the utility model is according to following technical scheme.DC earthing on-line testing instrument comprises switch, transformer, resistance etc., and switch series is linked on the primary circuit of transformer, and pressure regulator is connected in series on the secondary circuit of transformer, and resistance, adjustable resistance are connected in series on the secondary circuit of pressure regulator.Pincers type alternating current ammeter is connected in series on the adjustable resistance circuit afterwards.Described pressure regulator can be selected from autocoupling type pressure regulator, controllable silicon formula pressure regulator etc.Described pincers type alternating current ammeter can be selected from the anti-electromagnetic interference (EMI) reometer of M-100 type, M-140 type, M-340 type that Japanese Universal Measuring Instrument Co., Ltd. produces.
Can the shunt voltage table in above-mentioned circuit.
Can the series current table in above-mentioned circuit.
Superior part of the present utility model is:
1. online detection need not have a power failure, without segmentation;
2. multipoint earthing can not be caused during online detection, and multipoint earthing can be searched simultaneously;
3. measurement range is wide, can measure-220V ,-110V ,-the 48V straight-flow system;
4. simple to operate, safety, highly sensitive;
5. product price is cheap.
(4) description of drawings
Fig. 1 is an electrical block diagram of the present utility model.
Fig. 2 is the online detection synoptic diagram of the utility model.
(5) embodiment
Structural representation of the present utility model is referring to Fig. 1.DC earthing on-line testing instrument, comprise switch, transformer, resistance etc., concrete structure is that switch 1 is connected in series on the primary circuit of transformer 2, and pressure regulator 3 is connected in series on the secondary circuit of transformer 2, and resistance 4, adjustable resistance 5 are connected in series on the secondary circuit of pressure regulator 3.And then connect with the anti-electromagnetic interference (EMI) electric current " pincers type alternating current ammeter " 6 of M-100 type, M-140 type, M-340 type that Japanese Universal Measuring Instrument Co., Ltd. produces.Can shunt voltage table 7 in above-mentioned circuit.Can series current table 8 in above-mentioned circuit.
The dynamic online detection principle of the utility model is referring to Fig. 2.If tested straight-flow system prompting plus earth is connected the wherein single line of positive electrode bus with DC earthing on-line testing instrument, in addition single line ground connection." the pincers type alternating current ammeter of producing with Japanese Universal Measuring Instrument Co., Ltd. " 6 is stuck on A, B, D, E, the anodal circuit of F, if pincers type alternating current ammeter does not have electric current to show, illustrates that these circuits do not have ground connection during measurement.But anodal the measurement has electric current to show in the C loop, and this loop ground connection is described." pincers type alternating current ammeter " 6 progressively moved to load end, before earth fault, can measure fault current, and in case cross current in the fault point and disappear, but with the place of this failure judgement point, until finding earth point.
If the minus earth of tested straight-flow system prompting is connected the wherein single line of negative pole with DC earthing on-line testing instrument, other single line ground connection, step is the same.
If tested straight-flow system positive pole or negative pole multipoint earthing can be searched one by one according to above-mentioned steps.And for traditional detection mode, multipoint earthing can't be handled.
Claims (4)
1. DC earthing on-line testing instrument, comprise switch, transformer, resistance etc., it is characterized in that switch (1) is connected in series on the primary circuit of transformer (2), pressure regulator (3) is connected in series on the secondary circuit of transformer (2), and resistance (4), adjustable resistance (5) are connected in series on the secondary circuit of pressure regulator (3).
2. DC earthing on-line testing instrument as claimed in claim 1 is characterized in that pincers type alternating current ammeter (6) is connected in series on adjustable resistance (5) circuit afterwards.
3. DC earthing on-line testing instrument as claimed in claim 1 is characterized in that shunt voltage table (7) in circuit.
4. DC earthing on-line testing instrument as claimed in claim 1 or 2 is characterized in that series current table (8) in circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420074691 CN2722265Y (en) | 2004-09-17 | 2004-09-17 | DC grounding on-line tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420074691 CN2722265Y (en) | 2004-09-17 | 2004-09-17 | DC grounding on-line tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2722265Y true CN2722265Y (en) | 2005-08-31 |
Family
ID=35012635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420074691 Expired - Fee Related CN2722265Y (en) | 2004-09-17 | 2004-09-17 | DC grounding on-line tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2722265Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100570384C (en) * | 2008-04-01 | 2009-12-16 | 山东电力研究院 | Method for testing electric secondary AC loop |
| CN101666851A (en) * | 2009-06-05 | 2010-03-10 | 深圳市普禄科智能检测设备有限公司 | Insulation, voltage, grounding test and grounding finding device and use method thereof |
| CN101359029B (en) * | 2008-09-23 | 2010-06-02 | 东北电力大学 | Single bus DC earth fault on-line automatic monitoring apparatus |
| CN101963642A (en) * | 2010-09-30 | 2011-02-02 | 贵阳供电局 | Testing method and instrument of multipoint earthing slide-variable resistance of common circuit |
| CN101452034B (en) * | 2007-11-30 | 2011-08-10 | 上海市电力公司 | Portable intelligent DC earthing searching instrument |
| CN110824382A (en) * | 2019-12-06 | 2020-02-21 | 国家电网有限公司 | 10KV line grounding tester |
-
2004
- 2004-09-17 CN CN 200420074691 patent/CN2722265Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101452034B (en) * | 2007-11-30 | 2011-08-10 | 上海市电力公司 | Portable intelligent DC earthing searching instrument |
| CN100570384C (en) * | 2008-04-01 | 2009-12-16 | 山东电力研究院 | Method for testing electric secondary AC loop |
| CN101359029B (en) * | 2008-09-23 | 2010-06-02 | 东北电力大学 | Single bus DC earth fault on-line automatic monitoring apparatus |
| CN101666851A (en) * | 2009-06-05 | 2010-03-10 | 深圳市普禄科智能检测设备有限公司 | Insulation, voltage, grounding test and grounding finding device and use method thereof |
| CN101666851B (en) * | 2009-06-05 | 2012-12-12 | 深圳市普禄科智能检测设备有限公司 | Insulation, voltage, grounding test and grounding finding device and use method thereof |
| CN101963642A (en) * | 2010-09-30 | 2011-02-02 | 贵阳供电局 | Testing method and instrument of multipoint earthing slide-variable resistance of common circuit |
| CN101963642B (en) * | 2010-09-30 | 2012-10-03 | 贵阳供电局 | Testing method and instrument of multipoint earthing slide-variable resistance of common circuit |
| CN110824382A (en) * | 2019-12-06 | 2020-02-21 | 国家电网有限公司 | 10KV line grounding tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050831 Termination date: 20091019 |