CN208316293U - A kind of DC earthing device - Google Patents
A kind of DC earthing device Download PDFInfo
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- CN208316293U CN208316293U CN201820943529.0U CN201820943529U CN208316293U CN 208316293 U CN208316293 U CN 208316293U CN 201820943529 U CN201820943529 U CN 201820943529U CN 208316293 U CN208316293 U CN 208316293U
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- resistance unit
- breaker
- arrester
- resistance
- ground connection
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- 239000000919 ceramic Substances 0.000 claims abstract description 6
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- 239000002184 metal Substances 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 abstract description 11
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
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- 150000004706 metal oxides Chemical class 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
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- 238000000034 method Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model relates to a kind of DC earthing devices; it is applied particularly to the ground connection of flexible direct current distribution engineering neutral point; direct current distribution is mainly solved by the way of single high value ground connection; it is difficult to realize the frequency converter to equipment; the problems such as making system fluctuation of service; solve the problems, such as that the earthing or grounding means of AC distribution net can not achieve cut-offfing and measure to DC current simultaneously; the DC earthing device includes resistance unit R1, is characterized in that further include breaker CB, resistance unit R0, current transformer T0 and arrester NE；Breaker CB and resistance unit R0 series connection, the circuit after series connection is in parallel with resistance unit R1, the input terminal of one end access resistance unit R1 of arrester NE, other end ground connection；The output end of one end access resistance unit R1 of current transformer T0, other end ground connection；Resistance unit R0 and resistance unit R1 is ceramic resistor or metallic resistance.
Description
Technical field
The utility model relates to a kind of earthing or grounding means, and in particular to a kind of DC earthing device is matched applied to flexible direct current
The ground connection of net engineering neutral point.
Background technique
Flexible direct current distribution engineering is a kind of new based on voltage source converter, controllable shutdown device and pulsewidth modulation
Type HVDC Transmission Technology, such technology of transmission of electricity can instantaneously realize active and idle independent decoupling control, can be to passive network
Power supply, and it is readily configured MTDC transmission system without communication between converter station, active power and reactive power can be provided to system
Emergency Assistance.
With the deep development of urban network restructuring, power distribution network capacity increases sharply, and network structure is gradually improved, and is built according to city
If needing, overhead bare conductor road is just gradually substituted by cable and insulated conductor.But due to the ground fault of overvoltage initiation
It is commonplace, so that the reliability and continuity of power supply are destroyed.Therefore, how effectively, economic limitation power distribution network mistake
Voltage problem and how reliable, continuous power supply become currently for the focus of electricity consumption.
Whether traditional exchange distribution or flexible direct current distribution, neutral point are both needed to access resistor, it is therefore an objective to limit
Earth-fault current processed.Neutral point is through resistance-grounded system, the shortcomings that can eliminating isolated neutral, i.e. reduction transient overvoltage
Amplitude, so that the ground protection of sensitive and selective fault location is achieved.
The neutral earthing devices of existing AC distribution net are unable to satisfy DC current in flexible direct current distribution using switch
Requirement, while traditional mutual inductor is unable to satisfy the requirement of measurement DC current, thus this mode be difficult to meet it is flexible straight
Flow the through-flow and measurement request of distribution engineering DC current.It is right when neutral point is suitable for the system failure through the earthing mode of high resistant
The power distribution network of ground capacitance current Ic < 10A, the line voltage phase of route and magnitude do not change when the system failure, therefore three
Phase electrical equipment is still run as usual.But power department only allows to run 2 hours, when also ground fault occurs for another phase,
Two-phase grounding fault is then formed, very big short circuit current is generated, line facility is caused to damage.Therefore flexible direct current distribution is using single
The mode of one high value ground connection is difficult to realize the frequency converter to equipment, be easy to cause system fluctuation of service, pacifies to equipment
Some problems are caused entirely, equipment is not protected in time.
Utility model content
The purpose of this utility model is to solve direct current distribution by the way of single high value ground connection, it is difficult to be realized to equipment
Frequency converter, make system fluctuation of service, cause some problems to equipment safety, while solving connecing for AC distribution net
Ground device, which can not achieve, cut-offs and measures problem to DC current, provides a kind of DC earthing device.
The technical solution that the utility model solves the above problems is as follows:
A kind of DC earthing device, including resistance unit R1 are characterized in that further include breaker CB, resistance list
First R0, current transformer T0 and arrester NE；The breaker CB and resistance unit R0 series connection, circuit and resistance list after series connection
First R1 is in parallel, the input terminal of one end access resistance unit R1 of the arrester NE, other end ground connection；The current transformer T0
One end access resistance unit R1 output end, the other end ground connection；The resistance unit R0 and resistance unit R1 is ceramic resistor
Or metallic resistance.
Further, the breaker CB is vacuum circuit breaker or SF6 breaker.
Further, the current transformer T0 is dry type epoxy resin integrated cast structure or oil immersed type structure.
Further, the arrester NE is gapless metal-oxide lighting arrester, using porcelain housing or composite sheath knot
Structure.
Further, further include cabinet, the resistance unit R1, breaker CB, resistance unit R0, current transformer T0 and
Arrester NE is arranged at box house.
The utility model has the following beneficial effects:
1. the utility model provides a kind of scheme that neutral point uses parallel resistance to be grounded, realized not by dc circuit breaker
With the switching of resistance unit；High resistance ground when normal operation guarantees the reliability of system power supply.Breaker closing when failure, cuts
Transformation is low-impedance earthed system, guarantees protection act timeliness.When operating normally, the biggish resistance unit R1 of resistance value, system are put into
After breaking down, instruction is assigned by protection system, switching is carried out to neutral point parallel resistance unit R 0 by breaker, passes through electricity
Current transformer T0 is acquired signal and uploads, for controlling or protecting.The utility model passes through the control open circuit of T0 size of current
The switching of device controls the different resistance value ground states of DC earthing device, stablizes system more relatively reliable.
2. being different from the earthing or grounding means of AC system, the resistance Ceramics resistance of utility model device solves biography
System resistance because direct current charge with the time gather, resistance caused to burn the case where, and ceramic resistor have small in size, thermal capacity
The advantages such as big.
3. the utility model has used dc circuit breaker technologically advanced in industry to replace the switch of AC system, so that producing
The ability of product breaking direct current is protected, and solves the drawbacks of traditional product is unable to disjunction DC current.
4. the utility model DC earthing device solves the problems, such as that the service life of D.C. resistance, cut-offfing for DC current are asked
Topic, the measurement problem of DC current, while the miniaturization of equipment, intelligence are realized, and the measurement accuracy of current transformer
Also it is significantly larger than traditional product ability with transmission speed, arrester NE guarantees the voltage of resistor and mutual inductor in controlled range
It is interior, it is ensured that equipment safety.
Detailed description of the invention
Fig. 1 is the electrical schematic diagram of the utility model DC earthing device.
Appended drawing reference: 1- cabinet.
Specific embodiment
It is described in further detail below in conjunction with content of the drawings and specific embodiments to the utility model:
The DC earthing device that the present invention provides a kind of switchings is more flexible, protection is sensitiveer, more reliable.
A kind of DC earthing device as shown in Figure 1, including resistance unit R1, are characterized in that further include open circuit
Device CB, resistance unit R0, current transformer T0 and arrester NE；Wherein, breaker CB, resistance unit R0 connect, after series connection
Circuit is in parallel with resistance unit R1, the input terminal of one end access resistance unit R1 of arrester NE, other end ground connection；Current Mutual Inductance
The output end of one end access resistance unit R1 of device T0, other end ground connection.Breaker CB is used for switching resistance unit R0；Resistance list
It acquisition signal and is uploaded when first R1 is worked normally in input coefficient, when the current transformer T0 system failure, arrester NE protection should
DC earthing device is damaged from lightning surge.
When resistance unit R1 is worked normally in input coefficient, after system jam, instruction is assigned by protection system, is passed through
Breaker CB carries out switching to neutral point parallel resistance unit R 0, in this way, the new resistance value (R0 × R1) formed after R0 and R1 is in parallel/
(R0+R1) in access system, then fault-signal is acquired by current transformer T0 and uploads backstage, for controlling or protecting.
Direct current resistor, arrester, breaker, direct current instrument transformer are integrated into a cabinet 1 by the utility model, are realized
The miniaturization of equipment；Current transformer T0 controls the test value of electric current the switching of breaker, realizes different ground connection shapes
State, while meeting electrical stability and protection timeliness, realize the intelligence of equipment.
Breaker CB on-load can disjunction rated current and fault current, vacuum structure or SF6 structure specifically can be used.
Resistance unit R0 and resistance unit R1 is used to generate fault current when the system failure, for absorbing and consuming failure electricity
The raw energy of miscarriage, specific two resistance according to absorption energy size and the class of insulation require that ceramic resistor structure or metal can be used
Electric resistance structure.
Current transformer T0 is used to generate fault current when the system failure, to detect the signal of current break, uploads
In backstage, for controlling and protecting, dry type epoxy resin integrated cast structure or oil immersed type structure specifically can be used in the signal.
Arrester NE protects the DC earthing apparatus system to damage from lightning surge, keeps away for gapless metal-oxide
Porcelain housing or composite sheath encapsulation specifically can be used in thunder device structure.
In conclusion the utility model changes the earthing mode of one resistance of traditional neutral point order, meets flexible direct current and match
The requirement of intelligence, the miniaturization of net engineering is that a kind of switching is flexible, protects sensitive, reliable DC earthing device.
Claims (5)
1. a kind of DC earthing device, including resistance unit R1, it is characterised in that: further include breaker CB, resistance unit R0, electricity
Current transformer T0 and arrester NE；
The breaker CB and resistance unit R0 series connection, the circuit after series connection is in parallel with resistance unit R1, the arrester NE's
The input terminal of resistance unit R1, other end ground connection are accessed in one end；One end access resistance unit R1's of the current transformer T0
Output end, other end ground connection；
The resistance unit R0 and resistance unit R1 is ceramic resistor or metallic resistance.
2. DC earthing device according to claim 1, it is characterised in that: the breaker CB be vacuum circuit breaker or
SF6 breaker.
3. DC earthing device according to claim 1 or 2, it is characterised in that: the current transformer T0 is dry type ring
Oxygen resin-cast structure or oil immersed type structure.
4. DC earthing device according to claim 3, it is characterised in that: the arrester NE is the oxidation of gapless metal
Object arrester, using porcelain housing or composite sheath structure.
5. DC earthing device according to claim 4, it is characterised in that: further include cabinet (1), the resistance unit
It is internal that R1, breaker CB, resistance unit R0, current transformer T0 and arrester NE are arranged at cabinet (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820943529.0U CN208316293U (en) | 2018-06-19 | 2018-06-19 | A kind of DC earthing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820943529.0U CN208316293U (en) | 2018-06-19 | 2018-06-19 | A kind of DC earthing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208316293U true CN208316293U (en) | 2019-01-01 |
Family
ID=64708630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820943529.0U Active CN208316293U (en) | 2018-06-19 | 2018-06-19 | A kind of DC earthing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208316293U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011285A (en) * | 2019-04-25 | 2019-07-12 | 国家电网有限公司 | Grounding system and method for high-voltage high-capacity flexible direct current engineering |
-
2018
- 2018-06-19 CN CN201820943529.0U patent/CN208316293U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011285A (en) * | 2019-04-25 | 2019-07-12 | 国家电网有限公司 | Grounding system and method for high-voltage high-capacity flexible direct current engineering |
| CN110011285B (en) * | 2019-04-25 | 2021-04-23 | 国家电网有限公司 | Grounding system and method for high-voltage high-capacity flexible direct current engineering |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231122 Address after: 710119, No. 23, development avenue, new industrial park, hi tech Zone, Shaanxi, Xi'an Patentee after: Xi'an Shendian Electronic Device Co.,Ltd. Address before: No.6, Xingyuan Road, Fengjing Industrial Park, Xi'an, Shaanxi 710300 Patentee before: XI'AN SHENDIAN HIGH-VOLTAGE ELECTRICAL APPLIANCES CO.,LTD. |
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| TR01 | Transfer of patent right |