CN206271535U - Underground type grounding transformer - Google Patents
Underground type grounding transformer Download PDFInfo
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- CN206271535U CN206271535U CN201621466203.0U CN201621466203U CN206271535U CN 206271535 U CN206271535 U CN 206271535U CN 201621466203 U CN201621466203 U CN 201621466203U CN 206271535 U CN206271535 U CN 206271535U
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- pressure winding
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Abstract
A kind of underground type grounding transformer, including shell, tri-phase iron core, high pressure winding, low pressure winding, high-voltage connection terminal and low-voltage wiring terminal, high-voltage connection terminal, low-voltage wiring terminal is arranged on shell, high pressure winding, low pressure winding and iron core are arranged in shell, the stem of two or more number is included in tri-phase iron core, high-voltage connection terminal is connected with high pressure winding, low-voltage wiring terminal is connected with low pressure winding, insulated heat-conducting medium is filled with shell, its high pressure winding and low pressure winding are separately positioned on three-phase each stem unshakable in one's determination, winding on three-phase each stem unshakable in one's determination is equally divided into two sections, two sections of opposite polarities of winding, high pressure winding and low pressure winding are connected into Astrocytic conditioned medium by Z-connection.The utility model artificially sets up a neutral ground, and when system single phase ground fault, being passed through to the earth-current ground connection for flowing through trouble point becomes Line volume of device of pressure and returns to circuit, so as to the fault current information for giving automatic safety device offer sufficiently large.
Description
Technical field:
The utility model is related to electricity field, more particularly to electrical power distribution power technology, more particularly to distribution transformer, specifically
It is a kind of underground type grounding transformer.
Background technology:
10KV power networks in China's power system use the earth-free method of operation, and step down side is generally in power network
Triangle is connect around not having neutral point to be grounded.Therefore when isolated neutral system occurs singlephase earth fault, ground arc is not
Can extinguish, therefore following consequence can occur.
(1) there is the blow-out of intermittence and restrike in single-phase earthing electric arc, can produce arc grounding over-voltage, and its width method is reachable
More than 4 times of normal phase voltage peak value, the duration is long, and the insulation to electrical equipment causes greatly harm, weak in insulation
Place's formation punctures.
(2) because follow current causes air from Jie, the insulation of surrounding air is destroyed, easily develops into phase fault.
(3) ferro-resonance over-voltage is produced, voltage transformer is easily burnt out, and cause Explosion of on Arrester.
(4) trolley line is highly susceptible to dust powered nearby, the effect of hail, haze and rain and senses electrostatic charge, from
And Gai Bian Line roads voltage-to-ground, with the gradually concentration of charge inducing, detouring, it is very high to be produced with the equipment that it is connected with three
Suspension above earth potential, jeopardize equipment and its insulation over the ground.
(5) when isolated neutral system occurs singlephase earth fault, now the phase voltage voltage-to-ground of non-faulting will be raised
Zhi Line voltages, the capacitive earth current for detouring will be increased to original 1.73 times, so the capacitance current of trouble point will be normal
3 times of Qing Kuang Xia Line roads capacitive earth current, cause gap arc.
The content of the invention:
The purpose of this utility model is to provide a kind of underground type grounding transformer, described this underground type ground connection transformation
The technical problem that ground arc can not extinguish when device will solve transformer generation singlephase earth fault in the prior art.
This underground type grounding transformer of the present utility model, including shell, tri-phase iron core, high pressure winding, low pressure winding,
High-voltage connection terminal and low-voltage wiring terminal, described high-voltage connection terminal, low-voltage wiring terminal are arranged on shell, described
High pressure winding, low pressure winding and iron core are arranged in shell, and the stem of two or more number is included in tri-phase iron core, described
High-voltage connection terminal is connected with high pressure winding, and low-voltage wiring terminal is connected with low pressure winding, filled with insulation in described shell
Heat-conducting medium, wherein, described high pressure winding and low pressure winding are separately positioned on three-phase each stem unshakable in one's determination, and three-phase is unshakable in one's determination
Winding on each stem is equally divided into two sections, two sections of described opposite polarities of winding, and high pressure winding and low pressure winding press Z
Shape connection is connected into Astrocytic conditioned medium.
Operation principle of the present utility model is:The winding of three-phase is connected into Astrocytic conditioned medium, people by the utility model by Z-connection
To set up a neutral point, earth resistance is accessed in neutral point.Specific implementation method can access a ground connection on 10KV buses and become
Depressor, when system single phase ground fault, flow through trouble point to earth-current can pass through ground connection become pressure Line volumes of device and
In returning to circuit, to provide sufficiently large fault current information to automatic safety device.
When system occur one-phase short-circuit current when, the electric current flowed through in grounding transformer winding be equal to total current 3/
1, the duration of short circuit current is 10 seconds, and within the so short time, short circuit current heat produced in the windings is almost
All the temperature for making winding is raised, therefore grounding transformer wants the particular design to bear instantaneously to be input into the thermally-stabilised of high current
And dynamic stability, will not damage.
The utility model compares with prior art, and its effect is positive and obvious.The utility model is by high pressure winding
It is separately positioned on three-phase each stem unshakable in one's determination with low pressure winding, the winding on three-phase each stem unshakable in one's determination is equally divided into two
Section, two sections of opposite polarities of winding, high pressure winding and low pressure winding are connected into Astrocytic conditioned medium by Z-connection.It is artificial to set up a neutrality
Point, earth resistance is accessed in neutral point.Specific implementation method can access a grounding transformer on 10KV buses, when system hair
During raw single-line to ground fault, being passed through to the earth-current ground connection for flowing through trouble point becomes Line volumes of device of pressure and returns to circuit
Go, to provide sufficiently large fault current information to automatic safety device.
Brief description of the drawings:
Fig. 1 is the structural representation of underground type grounding transformer of the present utility model.
Fig. 2 is the Z-connection Astrocytic conditioned medium schematic diagram in the utility model.
Specific embodiment:
Embodiment 1:
As shown in Figure 1 and Figure 2, underground type grounding transformer of the present utility model, including shell 1, iron core (not shown),
High pressure winding (not shown), low pressure winding (not shown), high-voltage connection terminal 2, low-voltage wiring terminal 3 are constituted, described
High-voltage connection terminal 2, low-voltage wiring terminal 3 are arranged on shell 1, described high pressure winding (not shown), low pressure winding (figure
In do not show) and iron core be arranged in shell 1, described high pressure winding (not shown), low pressure winding (not shown) are arranged on
On iron core (not shown), described high-voltage connection terminal 2 is connected with high pressure winding (not shown), low-voltage wiring terminal 3 with
Low pressure winding (not shown) is connected, and insulated heat-conducting medium is filled with described shell 1, wherein, described high pressure winding and
Low pressure winding is separately positioned on three-phase each stem unshakable in one's determination, and the winding on three-phase each stem unshakable in one's determination is equally divided into two
Section, two sections of described opposite polarities of winding, high pressure winding and low pressure winding are connected into Astrocytic conditioned medium by Z-connection.
The operation principle of the present embodiment is:Three-phase windings are connected into Astrocytic conditioned medium by Z-connection, artificially set up a neutral point,
Earth resistance is accessed in neutral point.Specific implementation method can access a grounding transformer on 10KV buses, when system occurs
During single-line to ground fault, being passed through to the earth-current ground connection for flowing through trouble point becomes Line volumes of device of pressure and returns to circuit,
To provide sufficiently large fault current information to automatic safety device.
When system occur one-phase short-circuit current when, the electric current flowed through in grounding transformer winding be equal to total current 3/
1, the duration of short circuit current is 10 seconds, and within the so short time, short circuit current heat produced in the windings is almost
All the temperature for making winding is raised, therefore grounding transformer wants the particular design to bear instantaneously to be input into the thermally-stabilised of high current
And dynamic stability, will not damage.
Claims (1)
1. a kind of underground type grounding transformer, including shell, tri-phase iron core, high pressure winding, low pressure winding, high-voltage connection terminal and
Low-voltage wiring terminal, described high-voltage connection terminal, low-voltage wiring terminal are arranged on shell, described high pressure winding, low pressure
Winding and iron core are arranged in shell, and the stem of two or more number, described high-voltage connection terminal are included in tri-phase iron core
It is connected with high pressure winding, low-voltage wiring terminal is connected with low pressure winding, insulated heat-conducting medium is filled with described shell, it is special
Levy and be:Described high pressure winding and low pressure winding are separately positioned on three-phase each stem unshakable in one's determination, three-phase each heart unshakable in one's determination
Winding on post is equally divided into two sections, two sections of described opposite polarities of winding, and high pressure winding and low pressure winding press Z-connection
It is connected into Astrocytic conditioned medium.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201621466203.0U CN206271535U (en) | 2016-12-29 | 2016-12-29 | Underground type grounding transformer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201621466203.0U CN206271535U (en) | 2016-12-29 | 2016-12-29 | Underground type grounding transformer |
Publications (1)
Publication Number | Publication Date |
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CN206271535U true CN206271535U (en) | 2017-06-20 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN201621466203.0U Active CN206271535U (en) | 2016-12-29 | 2016-12-29 | Underground type grounding transformer |
Country Status (1)
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107591072A (en) * | 2017-10-09 | 2018-01-16 | 贵州电网有限责任公司 | A kind of Synthesized Diagnosis On Transformer Faults simulator and its emulation mode |
-
2016
- 2016-12-29 CN CN201621466203.0U patent/CN206271535U/en active Active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107591072A (en) * | 2017-10-09 | 2018-01-16 | 贵州电网有限责任公司 | A kind of Synthesized Diagnosis On Transformer Faults simulator and its emulation mode |
CN107591072B (en) * | 2017-10-09 | 2023-08-25 | 贵州电网有限责任公司 | Transformer comprehensive fault diagnosis simulation device and simulation method thereof |
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