CN206271535U - Underground type grounding transformer - Google Patents

Underground type grounding transformer Download PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
pressure winding
winding
low
phase
high pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201621466203.0U
Other languages
Chinese (zh)
Inventor
徐兴财
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGHAI RUIQI ELECTRICAL EQUIPMENT CO Ltd
Original Assignee
SHANGHAI RUIQI ELECTRICAL EQUIPMENT CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SHANGHAI RUIQI ELECTRICAL EQUIPMENT CO Ltd filed Critical SHANGHAI RUIQI ELECTRICAL EQUIPMENT CO Ltd
Priority to CN201621466203.0U priority Critical patent/CN206271535U/en
Application granted granted Critical
Publication of CN206271535U publication Critical patent/CN206271535U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

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

Underground type grounding transformer
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.
CN201621466203.0U 2016-12-29 2016-12-29 Underground type grounding transformer Active CN206271535U (en)

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
CN206271535U true CN206271535U (en) 2017-06-20

Family

ID=59047811

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201621466203.0U Active CN206271535U (en) 2016-12-29 2016-12-29 Underground type grounding transformer

Country Status (1)

Country Link
CN (1) CN206271535U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
CN203881875U (en) Low-voltage three-phase line fault generator
CN206271535U (en) Underground type grounding transformer
CN205178463U (en) Can switch grounding box with electricity
CN110518535A (en) Novel electrification deicing device and its de-icing method
CN206650184U (en) A kind of single-core cable sheath ground structure
Kizilcay et al. Analysis of switching transients of an EHV transmission line consisting of mixed power cable and overhead line sections
CN203278257U (en) High-voltage direct-current power supply device with rapid polarity reversal
CN113341267B (en) Safety analysis method for transformation of neutral point grounding mode of power distribution network
CN105529617A (en) Line lightning arrester
CN216056323U (en) Electrode type electric boiler's ground protection device
CN201918720U (en) Neutral point grounding resistor capable of removing arc flashover
CN203983981U (en) A kind of Intelligent transformer neutral-point grounding resistance cabinet
CN203573821U (en) High-voltage parallel capacitor
CN203826939U (en) Electricity utilization system applied to high-voltage plant of large and medium-sized thermal power plant
CN202817512U (en) Wiring system for 110kV transformer station
CN205945048U (en) Three -phase combined type over -voltage protector
CN103839657B (en) A kind of neutral point for transformer and the two grounding system of shell
CN206638705U (en) A kind of high-frequency electrical pulses flow sensor of belt sensor joint protective structure
CN204441714U (en) For the switch car of mobile substation
Evdokunin et al. Computer modeling of the processes arising during arcing ground faults in 35 kv resistance grounded systems
CN203747401U (en) Lightning protection device for distribution transformer
CN203589740U (en) Controllable highly-resistance power distribution unit
CN213210342U (en) Built-in partial discharge defect simulation device
CN213304976U (en) Ion conductor current-discharging type power supply lightning protection device
CN210111456U (en) 110KV GIS power distribution device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant