CN206595711U - Transformer neutral point gap earth protective device - Google Patents
Transformer neutral point gap earth protective device Download PDFInfo
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- CN206595711U CN206595711U CN201720223403.1U CN201720223403U CN206595711U CN 206595711 U CN206595711 U CN 206595711U CN 201720223403 U CN201720223403 U CN 201720223403U CN 206595711 U CN206595711 U CN 206595711U
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- gap
- arrester
- neutral point
- transformer
- voltage
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Abstract
The utility model provides a kind of transformer neutral point gap earth protective device, and it includes：Disconnecting switch, arrester, discharging gap, current transformer, main transformer high pressure winding and support.Wherein, disconnecting switch, arrester, discharging gap, current transformer are rack-mount；Disconnecting switch, arrester and discharging gap are connected in parallel；The neutral point of main transformer high pressure winding is in discharging gap and is directly grounded.The complete set of equipments that transformer neutral point gap earth protective device of the present utility model is integrated in one, the features such as with small volume, installation and debugging convenient and high reliability.
Description
Technical field
The utility model is related to Hyper-Voltage of Power Systems protection device, more particularly to a kind of transformer neutral point gap ground connection
Protection device.
Background technology
For being exclusively used in 110kV, 220kV, 330kV, 500kV power transformer neutral point protecting device, to realize neutrality
Put ground connection or earth-free two kinds of different methods of operation and design, so as to avoid transformer neutral point because by lightning impulse and failure
Cause voltage rise, caused damage to transformer insulated so that it can be widely applied to electric power, metallurgy, chemical industry, coal row
Industry, as urgent problem to be solved.
Utility model content
In order to solve the above-mentioned technical problem, a kind of transformer neutral point gap ground protection dress is disclosed in the utility model
Put, the technical solution of the utility model is implemented：
A kind of 220kV transformer neutral point gap earth protective devices, it includes：Between disconnecting switch, arrester, electric discharge
Gap, current transformer, main transformer high pressure winding and support.Wherein, disconnecting switch, arrester, discharging gap, current transformer are installed
On support；Disconnecting switch, arrester and discharging gap are connected in parallel；The neutral point of main transformer high pressure winding is in discharging gap
And it is directly grounded.
The neutral point of main transformer high pressure winding is 110kV dielectric levels, from Y1.5W-144/320 type zinc oxide, discharging gap
Clearance distance be 300mm；Discharging gap is rod iron gap, and rod iron gap is φ 16mm galvanized steel bars, and its end shape is half
Circle is without corner angle and does not weld steel ball, and its afterbody is provided with regulation screw thread；Discharging gap horizontal positioned is to prevent rainwater short circuit；It is lightning-arrest
Device is provided with discharge counter；The base of support is provided with four mounting holes for being lifted.
Preferably, arrester is Y1.5W-144/320 type Zinc-Oxide Arresters.
Preferably, the operating temperature of the device is -40 DEG C~+55 DEG C.
Preferably, the length of the device is 1000-1300mm, and width is 300-370mm, is highly 1500-1900mm.
Preferably, the peak value of the thunder and lightning all-wave of transformer neutral point and wave chopping withstanding voltage is 400kV.
Preferably, the 1min power frequencies of transformer neutral point are 200kV.
Preferably, the rated current of disconnecting switch is 400-630A.
Preferably, the rated voltage of arrester is 144kV.
Preferably, the continuous running voltage of arrester is 116kV.
Preferably, reference voltage is not less than 205kV when arrester is direct current 1mA.
Preferably, the peak value of 8/20 μ s lightning impulse current residual voltages of arrester is 320kV.
Preferably, the power-frequency sparkover voltage of discharging gap is 166kV.
Preferably, the pattern of current transformer is the totally-enclosed column support type 10kV of poured with epoxy resin.
Preferably, the no-load voltage ratio of current transformer is 20-120.
A kind of 110kV transformer neutral point gap earth protective devices, it includes：Between disconnecting switch, arrester, electric discharge
Gap, current transformer, main transformer high pressure winding and support.Wherein, disconnecting switch, arrester, discharging gap, current transformer are installed
On support；Disconnecting switch, arrester and discharging gap are connected in parallel；The neutral point of main transformer high pressure winding is in discharging gap
And it is directly grounded.
The neutral point of main transformer high pressure winding is 60kV dielectric levels, from Y1.5W-60/144 type zinc oxide, discharging gap
Clearance distance is 115mm, 120mm or 140mm；Discharging gap is rod iron gap, and rod iron gap is φ 16mm galvanized steel bars, its end
Portion is shaped as semicircle without corner angle and does not weld steel ball, and its afterbody is provided with regulation screw thread；Discharging gap horizontal positioned is to prevent rain
Water short circuit；Arrester is provided with discharge counter；The base of support is provided with four mounting holes for being lifted.
Preferably, arrester is Y1.5W-60/144 type Zinc-Oxide Arresters.
Preferably, the operating temperature of the device is -40 DEG C~+55 DEG C.
Preferably, the length of the device is 1000-1300mm, and width is 300-370mm, is highly 1000-1315mm.
Preferably, the peak value of the thunder and lightning all-wave of transformer neutral point and wave chopping withstanding voltage is 2500kV.
Preferably, the 1min power frequencies of transformer neutral point are 95kV.
Preferably, the rated current of disconnecting switch is 400-630A.
Preferably, the rated voltage of arrester is 72kV.
Preferably, the continuous running voltage of arrester is 58kV.
Preferably, reference voltage is not less than 103kV when arrester is direct current 1mA.
Preferably, the peak value of 8/20 μ s lightning impulse current residual voltages of arrester is 186kV.
Preferably, the power-frequency sparkover voltage of discharging gap is 83kV.
Preferably, the pattern of current transformer is the totally-enclosed column support type 10kV of poured with epoxy resin.
Preferably, the no-load voltage ratio of current transformer is 20-120.
Implementing the beneficial effects of the utility model is：
The complete set of equipments that transformer neutral point gap earth protective device of the present utility model is integrated in one, with volume
The features such as small, installation and debugging are conveniently and reliability is high.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is a kind of embodiment of the present utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the first width principle schematic of transformer neutral point gap earth protective device of the present utility model.
Fig. 2 is the second width principle schematic of transformer neutral point gap earth protective device of the present utility model.
Fig. 3 is the ground of transformer neutral point gap earth protective device of the present utility model with reference to figure.
Fig. 4 is transformer neutral point gap earth protective device general assembly drawing of the present utility model.
Fig. 5 illustrates for the first width operating mechanism wiring of transformer neutral point gap earth protective device of the present utility model
Figure.
Fig. 6 illustrates for the second width operating mechanism wiring of transformer neutral point gap earth protective device of the present utility model
Figure.
Fig. 7 is the front view of transformer neutral point gap earth protective device of the present utility model.
Fig. 8 is the left view of transformer neutral point gap earth protective device of the present utility model.
Fig. 9 is the rearview of transformer neutral point gap earth protective device of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is paid
The every other embodiment obtained, belongs to the scope of the utility model protection.
Before use, the transformer neutral point gap earth protective device needs to carry out following performance test：
1. arrester is tested：
A. power frequency 1mA reference voltages are tested：
Apply power-frequency voltage at arrester two ends, when being equal to 1mA by the electric current of arrester, measurement is added on arrester
Power-frequency voltage, the voltage should be not less than arrester rated voltage.
B. direct current 1mA reference voltages are tested：
Apply DC voltage (pulsatile portion of DC voltage is not more than ± 1.5%) at arrester two ends, when by lightning-arrest
When the electric current of device is 1mA, measurement is added in the DC voltage value on arrester, and the voltage should cannot be less than setting.
C. leakage current test：
Apply 0.75 times of direct current 1mA reference voltage at arrester two ends, measure the leakage current for flowing through arrester, the current value
50 μ A should be not more than.
Herein it should be noted that：Forbid to do power frequency sparking voltage test to arrester.
2. disconnecting switch mechanically actuated and mechanical characteristic test：
10 times points, the unloaded operation of combined floodgate are carried out to disconnecting switch, closing position and open position should be reached every time.And it is whole
Disconnecting switch each several part is harmless during individual.
3. discharging gap is tested：
Power-frequency sparkover voltage is tested：
In testing transformer primary side one piece of 10A of series connection and the ammeter of the above.Input terminal and ground terminal N in gap
Between apply power-frequency voltage, the voltage of discharging gap is applied to during experiment to start from scratch, high-pressure side can accurate reading bar
Under part, (observation ammeter, when electric current is undergone mutation, shows gap discharge, electricity this moment untill gap discharge is boosted to rapidly
Pressure value should be power-frequency sparkover voltage value)., should be in 0.2s internal cutting off power frequency supplies every time after electric discharge.Per double test period
Interval is not less than 10s, and pendulous frequency is 3 times, and the discharge voltage value surveyed every time, which should meet in technical data sheet, to be provided.
In a kind of embodiment, as shown in Figures 1 to 9, a kind of 220kV transformer neutral point gaps ground protection
Device, it includes：Disconnecting switch, arrester, discharging gap, current transformer, main transformer high pressure winding and support.Wherein, isolate
Switch, arrester, discharging gap, current transformer are rack-mount；Disconnecting switch, arrester and discharging gap parallel connection are even
Connect；Discharging gap should be acted when forming local isolated neutral system because of earth fault；System is run in effective grounding mode, occurs list
During to earth fault, discharging gap should not be acted；Arrester should be able to bear the steady state voltage rise of neutral point during unidirectional ground connection.Put
The standard lightning wave discharge voltage and arrester lightning impulse residual voltage in electric gap should be less than the tolerances of transformer neutral point lightning impulse
Level.The neutral point of main transformer high pressure winding is in discharging gap and is directly grounded.
The neutral point of main transformer high pressure winding is 110kV dielectric levels, from Y1.5W-144/320 type zinc oxide, discharging gap
Clearance distance be 300mm.
Discharging gap be rod iron gap, rod iron gap be φ 16mm galvanized steel bars, its end shape be semicircle without corner angle simultaneously
And steel ball is not welded, its afterbody is provided with regulation screw thread.
Discharging gap horizontal positioned is to prevent rainwater short circuit.
Arrester is provided with discharge counter, in order to which tour personnel monitors.
The base of support is provided with four mounting holes for being lifted.
In a kind of preferred embodiment of the present utility model, arrester is Y1.5W-144/320 type Zinc-Oxide Arresters.
In a kind of preferred embodiment of the present utility model, the work of 220kV transformer neutral point gap earth protective devices
Make temperature for -40 DEG C~+55 DEG C.
In a kind of preferred embodiment of the present utility model, the length of 220kV transformer neutral point gap earth protective devices
Spend for 1000mm, width is 370mm, is highly 1500mm, the size of the device is not particularly limited herein.
In a kind of preferred embodiment of the present utility model, the thunder and lightning all-wave of transformer neutral point and wave chopping withstanding voltage
Peak value is 400kV.
In a kind of preferred embodiment of the present utility model, the 1min power frequencies of transformer neutral point are 200kV.
In a kind of preferred embodiment of the present utility model, the rated current of disconnecting switch is 400-630A.
In a kind of preferred embodiment of the present utility model, the rated voltage of arrester is 144kV.
In a kind of preferred embodiment of the present utility model, the continuous running voltage of arrester is 116kV.
In a kind of preferred embodiment of the present utility model, reference voltage is not less than 205kV when arrester is direct current 1mA.
In a kind of preferred embodiment of the present utility model, the peak value of 8/20 μ s lightning impulse current residual voltages of arrester is
320kV。
In a kind of preferred embodiment of the present utility model, the power-frequency sparkover voltage of discharging gap is 166kV.
In a kind of preferred embodiment of the present utility model, the pattern of current transformer is the totally-enclosed branch of poured with epoxy resin
Pillar 10kV.
In a kind of preferred embodiment of the present utility model, the no-load voltage ratio of current transformer is 20-120.
A kind of 110kV transformer neutral point gap earth protective devices, it includes：Between disconnecting switch, arrester, electric discharge
Gap, current transformer, main transformer high pressure winding and support.Wherein, disconnecting switch, arrester, discharging gap, current transformer are installed
On support；Disconnecting switch, arrester and discharging gap are connected in parallel, and are discharged when forming local isolated neutral system because of earth fault
Gap should be acted；When system is run in effective grounding mode, occurred one-way earth fault, discharging gap should not be acted；Arrester
The steady state voltage rise of neutral point during unidirectional ground connection should be able to be born.The standard lightning wave discharge voltage and arrester thunder of discharging gap
Surge residual voltage should be less than transformer neutral point lightning impulse tolerance level.The neutral point of main transformer high pressure winding is located at discharging gap
It is interior and be directly grounded.
The neutral point of main transformer high pressure winding is 60kV dielectric levels, from Y1.5W-60/144 type zinc oxide, discharging gap
Clearance distance is 115mm, 120mm or 140mm.
When the neutral point of main transformer high pressure winding is 60kV dielectric levels (LI325AC140), preferably from Y1.5W-60/144
Type Zinc-Oxide Arrester is in parallel with discharging gap (distance is 140mm).
When the neutral point of main transformer high pressure winding is 44kV dielectric levels (LI250AC95), preferably from Y1.5W-60/144 types
Zinc-Oxide Arrester is in parallel with discharging gap (distance is 120mm).
, can be using between individually electric discharge when the neutral point of main transformer high pressure winding is 35kV dielectric levels (LI185AC85)
Gap is protected, and discharging gap distance preferably selects 115mm.
Discharging gap be rod iron gap, rod iron gap be φ 16mm galvanized steel bars, its end shape be semicircle without corner angle simultaneously
And steel ball is not welded, its afterbody is provided with regulation screw thread.
Discharging gap horizontal positioned is to prevent rainwater short circuit.
Arrester is provided with discharge counter, in order to which tour personnel monitors.
The base of support is provided with four mounting holes for being lifted.
In a kind of preferred embodiment of the present utility model, arrester is Y1.5W-60/144 type Zinc-Oxide Arresters.
In a kind of preferred embodiment of the present utility model, the work of 110kV transformer neutral point gap earth protective devices
Make temperature for -40 DEG C~+55 DEG C.
In a kind of preferred embodiment of the present utility model, the length of 110kV transformer neutral point gap earth protective devices
Spend for 1000mm, width is 370mm, is highly 1315mm, the size of the device is not particularly limited herein.
In a kind of preferred embodiment of the present utility model, the thunder and lightning all-wave of transformer neutral point and wave chopping withstanding voltage
Peak value is 250kV.
In a kind of preferred embodiment of the present utility model, the 1min power frequencies of transformer neutral point are 95kV.
In a kind of preferred embodiment of the present utility model, the rated current of disconnecting switch is 400-630A.
In a kind of preferred embodiment of the present utility model, the rated voltage of arrester is 72kV.
In a kind of preferred embodiment of the present utility model, the continuous running voltage of arrester is 58kV.
In a kind of preferred embodiment of the present utility model, reference voltage is not less than 103kV when arrester is direct current 1mA.
In a kind of preferred embodiment of the present utility model, the peak value of 8/20 μ s lightning impulse current residual voltages of arrester is
186kV。
In a kind of preferred embodiment of the present utility model, the power-frequency sparkover voltage of discharging gap is 83kV.
In a kind of preferred embodiment of the present utility model, the pattern of current transformer is the totally-enclosed branch of poured with epoxy resin
Pillar 10kV.
In a kind of preferred embodiment of the present utility model, the no-load voltage ratio of current transformer is 20-120.
It is pointed out that preferred embodiment of the present utility model is the foregoing is only, not to limit this reality
With new, all within spirit of the present utility model and principle, any modification, equivalent substitution and improvements made etc. all should be included
Within protection domain of the present utility model.
Claims (10)
1. a kind of transformer neutral point gap earth protective device, operating voltage is 220kV, it is characterised in that：It includes：Isolation
Switch, arrester, discharging gap, current transformer, main transformer high pressure winding and support；
The disconnecting switch, the arrester, the discharging gap, the current transformer are installed on the bracket；
The disconnecting switch, the arrester and the discharging gap are connected in parallel；
The neutral point of the main transformer high pressure winding is in the discharging gap and is directly grounded；
The neutral point of the main transformer high pressure winding is 110kV dielectric levels, from Y1.5W-144/320 type zinc oxide, the electric discharge
The clearance distance in gap is 300mm；
The discharging gap is rod iron gap, and the rod iron gap is φ 16mm galvanized steel bars, and its end shape is semicircle without rib
Angle and steel ball is not welded, its afterbody is provided with regulation screw thread；
The discharging gap horizontal positioned is to prevent rainwater short circuit；
The arrester is provided with discharge counter；
The base of the support is provided with four mounting holes for being lifted.
2. transformer neutral point gap earth protective device according to claim 1, it is characterised in that：The arrester is
Y1.5W-144/320 type Zinc-Oxide Arresters.
3. transformer neutral point gap earth protective device according to claim 1, it is characterised in that：The work of the device
Temperature is -40 DEG C~+55 DEG C.
4. transformer neutral point gap earth protective device according to claim 1, it is characterised in that：The length of the device
For 1000-1300mm, width is 300-370mm, is highly 1500-1900mm.
5. transformer neutral point gap earth protective device according to claim 1, it is characterised in that：In the transformer
Property point thunder and lightning all-wave and wave chopping withstanding voltage peak value be 400kV；Or,
The 1min power frequencies of the transformer neutral point are 200kV；Or,
The rated current of the disconnecting switch is 400-630A；Or,
The rated voltage of the arrester is 144kV；Or,
The continuous running voltage of the arrester is 116kV；Or,
Reference voltage is not less than 205kV when the arrester is direct current 1mA；Or,
The peak value of 8/20 μ s lightning impulse current residual voltages of the arrester is 320kV；Or,
The power-frequency sparkover voltage of the discharging gap is 166kV；Or,
The pattern of the current transformer is the totally-enclosed column support type 10kV of poured with epoxy resin；Or,
The no-load voltage ratio of the current transformer is 20-120.
6. a kind of transformer neutral point gap earth protective device, operating voltage is 110kV, it is characterised in that：It includes：Isolation
Switch, arrester, discharging gap, current transformer, main transformer high pressure winding and support；
The disconnecting switch, the arrester, the discharging gap, the current transformer are installed on the bracket；
The disconnecting switch, the arrester and the discharging gap are connected in parallel；
The neutral point of the main transformer high pressure winding is in the discharging gap and is directly grounded；
The neutral point of the main transformer high pressure winding is 60kV dielectric levels, from Y1.5W-60/144 type zinc oxide, between the electric discharge
The clearance distance of gap is 115mm, 120mm or 140mm；
The discharging gap is rod iron gap, and the rod iron gap is φ 16mm galvanized steel bars, and its end shape is semicircle without rib
Angle and steel ball is not welded, its afterbody is provided with regulation screw thread；
The discharging gap horizontal positioned is to prevent rainwater short circuit；
The arrester is provided with discharge counter；
The base of the support is provided with four mounting holes for being lifted.
7. transformer neutral point gap earth protective device according to claim 6, it is characterised in that：The arrester is
Y1.5W-60/144 type Zinc-Oxide Arresters.
8. transformer neutral point gap earth protective device according to claim 6, it is characterised in that：The work of the device
Temperature is -40 DEG C~+55 DEG C.
9. transformer neutral point gap earth protective device according to claim 6, it is characterised in that：The length of the device
For 1000-1300mm, width is 300-370mm, is highly 1000-1315mm.
10. transformer neutral point gap earth protective device according to claim 6, it is characterised in that：The transformer
The thunder and lightning all-wave of neutral point and the peak value of wave chopping withstanding voltage are 250kV；Or,
The 1min power frequencies of the transformer neutral point are 95kV；Or,
The rated current of the disconnecting switch is 400-630A；Or,
The rated voltage of the arrester is 72kV；Or,
The continuous running voltage of the arrester is 58kV；Or,
Reference voltage is not less than 103kV when the arrester is direct current 1mA；Or,
The peak value of 8/20 μ s lightning impulse current residual voltages of the arrester is 186kV；Or,
The power-frequency sparkover voltage of the discharging gap is 83kV；Or,
The pattern of the current transformer is the totally-enclosed column support type 10kV of poured with epoxy resin；Or,
The no-load voltage ratio of the current transformer is 20-120.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720223403.1U CN206595711U (en) | 2017-03-08 | 2017-03-08 | Transformer neutral point gap earth protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720223403.1U CN206595711U (en) | 2017-03-08 | 2017-03-08 | Transformer neutral point gap earth protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206595711U true CN206595711U (en) | 2017-10-27 |
Family
ID=60126889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720223403.1U Expired - Fee Related CN206595711U (en) | 2017-03-08 | 2017-03-08 | Transformer neutral point gap earth protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206595711U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112787316A (en) * | 2020-12-30 | 2021-05-11 | 广东电网有限责任公司电力科学研究院 | Suppression device for transformer excitation surge current |
-
2017
- 2017-03-08 CN CN201720223403.1U patent/CN206595711U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112787316A (en) * | 2020-12-30 | 2021-05-11 | 广东电网有限责任公司电力科学研究院 | Suppression device for transformer excitation surge current |
| CN112787316B (en) * | 2020-12-30 | 2023-06-23 | 广东电网有限责任公司电力科学研究院 | Device for inhibiting excitation surge current of transformer |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20171027 Termination date: 20200308 |