CN208690935U - Combined cabinet type impedance giant generator set neutral point grounding device - Google Patents
Combined cabinet type impedance giant generator set neutral point grounding device Download PDFInfo
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- CN208690935U CN208690935U CN201820788457.7U CN201820788457U CN208690935U CN 208690935 U CN208690935 U CN 208690935U CN 201820788457 U CN201820788457 U CN 201820788457U CN 208690935 U CN208690935 U CN 208690935U
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Abstract
本实用新型公开了一种组合柜体式阻抗型巨型发电机组中性点接地装置，涉及一种发电机组中性点接地装置。它包括电阻器柜、变压器柜和电抗器柜、第一操作机构底座、第二操作机构底座、第一支柱绝缘子、第二支柱绝缘子、开关刀闸、开关传动器、开关传动手柄、开关传动三角块、变压上铁轭、变压下铁轭、电阻壳体、电阻器、电抗壳体和电抗器、第一电抗支撑架、第二电抗支撑架、电抗隔板，电抗器上安装有电抗器进线，电抗器上端与电抗壳体的侧壁连接，电抗器下端与第一电抗支撑架连接，第二电抗支撑架和电抗隔板之间为预留的电抗器空间。本实用新型可以对单一设备柜内的设备进行改造或更换，改造更灵活、更容易。
The utility model discloses a combined cabinet type impedance type giant generator set neutral point grounding device, which relates to a generator set neutral point grounding device. It includes a resistor cabinet, a transformer cabinet and a reactor cabinet, a first operating mechanism base, a second operating mechanism base, a first pillar insulator, a second pillar insulator, a switch knife switch, a switch drive, a switch drive handle, and a switch drive triangle. Block, transformer upper yoke, transformer lower yoke, resistor housing, resistor, reactance housing and reactor, first reactance support frame, second reactance support frame, reactance partition plate, the reactor is equipped with a reactance The upper end of the reactor is connected to the side wall of the reactance shell, the lower end of the reactor is connected to the first reactance support frame, and the reactor space is reserved between the second reactance support frame and the reactance partition. The utility model can modify or replace the equipment in a single equipment cabinet, and the modification is more flexible and easier.
Description
Technical field
The present invention relates to a kind of generating set neutral earthing devices, specifically a kind of combination cabinet style impedance type is huge
Generator group neutral earthing devices.
Background technique
In the ground side of generating set, single generating set below for 600MW, the country generally use reactance grounded or
High resistance ground (has transformer), and foreign countries generally use reactance grounded.
For the large rubber good of 600MW or more, external reactance grounded mode can satisfy requirement, but due to overload to be had
Protective device, therefore higher cost；In the large rubber good of 600MW or more, since the unit electric current of 600MW easily reaches
30A can burn out battery core, result in waste of resources, therefore, currently, the country is that the large rubber good of 600MW or more is divided into several connection
Large-scale machine set together or Pump for Medium and Small Power Generating Set are tied, to make the capacity of single unit be not more than 600MW, to meet me
The domestic general unit method of construction of state.
Excessive problem, a kind of Chinese invention patent " generator are easy for the unit capacitance current of state time generator group
The high induction reactance earthing or grounding means of neutral point " (patent No.: ZL201510310760.7) discloses a kind of high induction reactance of generator neutral point and connects
Ground device, the device enable to short circuit current limit value to 15A hereinafter, its applicable object is 200MW middle-size and small-size hair below
Motor group, single-phase direct-to-ground capacitance are 2.068 μ F.And for 600MW and the huge water wheel generator of the above capacity, then above-mentioned power generation
The high induction reactance earthing or grounding means of machine neutral point can not be met the requirements, and concrete reason is as follows: according to the structure of the patent notes, then by
All electrical equipments are both placed in machine unit shell in the neutral earthing devices, therefore the not only volume of neutral earthing devices
Very greatly (if too high, the inconvenience of installing of height), and inconvenience can be overhauled (since all units are placed on the same device
It is interior, therefore modify inconvenience).
Meanwhile it being easy excessive problem for the unit electric current of state time generator group, Chinese utility model patent is " in novel
Property point grounding resistor " (patent No.: ZL200920096920.2 ") discloses a kind of novel neutral grounding resistor, the dress
Setting is improvement on the high grounding basis through distribution transformer, and it is fixed to be still difficult to solve huge water wheel generator
Sub- winding-to-earth capacity larger the problem of bringing.Simultaneously because the device only changes the size of resistance value, in ground fault capacitor
When electric current is more than 18A, it may be difficult to limit earth-fault current to 25A or less.
Summary of the invention
The purpose of the invention is to overcome the shortcoming of background technique, and it is huge to provide a kind of combination cabinet style impedance type
Generator group neutral earthing devices.
To achieve the goals above, the technical solution of the present invention is as follows: combination cabinet style impedance type gigantic generating units are neutral
Point earthing or grounding means, it is characterised in that: including resistor cabinet, transformer case and reactor cabinet；
The transformer case includes transformation shell, bracket partition, the switch operating mechanism above bracket partition, is located at
Transformation mechanism below bracket partition；
The bracket partition, switch operating mechanism and transformation mechanism are installed in transformation enclosure interior；
The switch operating mechanism include the first operating mechanism pedestal, second operation machine structure pedestal, the first support insulator,
Second support insulator, switch tool, switch driver, switch driving handle, switch transmission corner block, the first operation machine
Structure pedestal and second operation machine structure pedestal are installed on bracket partition, and the first support insulator is mounted on the first operating mechanism bottom
On seat, the second support insulator is mounted on second operation machine structure pedestal, described switch tool one end and the first support insulator
Connection, the other end are connect with the second support insulator, and described switch driver one end is connect with switch tool, the other end and switch
The end for being driven corner block is hinged, and the middle part of the switch transmission corner block and the first operating mechanism pedestal are hinged, the switch
Driving handle is mounted on the first operating mechanism pedestal, and switchs the output end of driving handle and the middle part of switch transmission corner block
It connects and drives switch transmission corner block rotation；
The transformation mechanism includes transformation upper yoke and transformation lower yoke, and transformation lower yoke lower end is pacified by transformation supporting block
Loaded on transformation housing bottom, spaced apart transformer winding there are two installations on transformation lower yoke, and two transformer windings
Between connected by winding coupling line, be also equipped with transformation copper bar on the winding coupling line, transformation copper bar passes through transformation and insulate
Column is connect with the inner sidewall of transformation shell；
The resistor cabinet includes resistance shell and resistor, and resistance enclosure interior is connected with the first electricity in turn from top to bottom
Support frame, second resistance support frame and resistance partition are hindered, resistor inlet wire and several resistance copper bars are installed on the resistor,
And resistor upper end is connect by first resistor insulator with the side wall of resistance shell, resistor lower end is insulated by second resistance
Son is connect with first resistor support frame, and first resistor support frame lower end is connected with resistance mesh enclosure, on second resistance support frame
First current transformer is installed, is reserved resistor space between the second resistance support frame and resistance partition；
The reactor cabinet includes reactance shell and reactor, and the reactance enclosure interior is connected in turn from top to bottom
One reactance support frame, the second reactance support frame and reactance partition are equipped with reactor inlet wire on the reactor, and on reactor
End is connect by the first reactance insulator with the side wall of reactance shell, and reactor lower end passes through the second reactance insulator and the first electricity
Anti- support frame connection, the first reactance support frame lower end is connected with reactance mesh enclosure, is equipped with second on the second reactance support frame
Current transformer is reserved reactor space between the second reactance support frame and reactance partition；
The resistance hull outside and reactance hull outside, which are respectively connected with, is equipped with shutter and ground wire entrance, the resistance
Cold dew device and electric heater terminal are mounted on partition and reactance partition.
The present invention provides a kind of combination cabinet style impedance type generator neutral point earthing or grounding means, compared with prior art,
It has the advantages that
1, it is easily installed and safeguards, armamentarium is placed in a cabinet body by traditional neutral earthing devices, this
Although arrangement can save spatial position to a certain extent, single cabinet body volume is big, weight weight, and installation and maintenance are not
Convenient, after combination cabinet body, single cabinet body splits into 3 cabinet bodies, and single cabinet body is small in size, light-weight, it is more easy to install and
Maintenance, is also convenient for replacing.
2, electric link mode and parameter configuration can be with flexible choices.
3, when power plant capacity-increasing transformation or other need to change the situation of grounding transformer or resistor or reactance value etc. when,
Equipment in single equipment cabinet can be transformed or be replaced, transformation is more flexible, is easier.
4, the electric operating of disconnecting switch may be implemented in the introducing of motor-operating mechanism, and satisfaction needs to carry out earthing or grounding means
The requirement electrically switched.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of resistor cabinet.
Fig. 2 is the structural schematic diagram of reactor cabinet.
Fig. 3 is the structural schematic diagram of transformer case.
Fig. 4 is the structural front view of the shell of reactor cabinet.
1- resistor cabinet in figure, 11- resistance shell, 12- resistor, 13- first resistor support frame, 14- second resistance branch
Support, 15- resistance partition, 16- resistor inlet wire, 17- resistance copper bar, 18- first resistor insulator, the insulation of 19- second resistance
Son, 110- resistance mesh enclosure, the first current transformer of 111-, 112- resistor space, 2- transformer case, 21- transformation shell, 22-
Bracket partition, 3- reactor cabinet, 31- reactance shell, 32- reactor, 33- the first reactance support frame, the second reactance of 34- support
Frame, 35- reactance partition, 37- the first reactance insulator, 38- the second reactance insulator, 39- reactance mesh enclosure, the second electric current of 310- are mutual
Sensor, 311- reactor space, 4- switch operating mechanism, 41- the first operating mechanism pedestal, 42- second operation machine structure pedestal,
The first support insulator of 43-, the second support insulator of 44-, 45- switch tool, 46- switch driver, 47- switch transmission hand
Handle, 48- switch transmission corner block, 5- transformation mechanism, 51- transformation upper yoke, 52- transformation lower yoke, 53- transformer winding, 54-
Winding coupling line, 55- transformation copper bar, 61- shutter, 62- ground wire entrance, the cold dew device of 63-, 64- electric heater terminal.
Specific embodiment
The performance that the invention will now be described in detail with reference to the accompanying drawings, but they and do not constitute a limitation of the invention, only
It is for example.Keep advantages of the present invention more clear by explanation simultaneously and is readily appreciated that.
Refering to known to attached drawing: combination cabinet style impedance type gigantic generating units neutral earthing devices, including resistor cabinet
1, transformer case 2 and reactor cabinet 3；
Wherein, the resistor cabinet 1 and reactor cabinet 3 are located at the secondary side or ipsilateral of transformer case 2, when resistor cabinet 1
With reactor cabinet 3 be series connection be coupled when, transformer case 2 input terminal access resistor cabinet 1 input terminal, resistor cabinet 1 it is defeated
Outlet is coupled with the input terminal of reactor cabinet 3, the output end of reactor cabinet 3 and the output coupled of transformer case 2；Work as resistor
When cabinet 1 and reactor cabinet 3 are in parallel be coupled, the input terminal of the input terminal access resistor 12 of transformer case 2, while accessing reactance
The input terminal of device cabinet 3；
Wherein, the inductance X on the resistance R and reactor cabinet 3 on resistor cabinet 1LFollowing formula should be met:
Wherein, formula (4) is suitable for resistor cabinet 1 and the series connection of reactor cabinet 3 is coupled, and formula (5) is suitable for resistor cabinet 1
With the connection in parallel of reactor cabinet 3, UNFor the voltage rating of generator, C0For the single-phase total capacitance over the ground of stator winding, ω is angular frequency
Rate, j are imaginary unit, IsafeFor short circuit current limit value, UsafeFor transient overvoltage limit value, R is resistance, XLFor reactance
The transformer case 2 includes transformation shell 21, bracket partition 22, the switch operation machine above bracket partition 22
Structure 4, the transformation mechanism 5 positioned at 22 lower section of bracket partition；
The bracket partition 22, switch operating mechanism 4 and transformation mechanism 5 are installed in inside transformation shell 21；
The switch operating mechanism 4 is exhausted including the first operating mechanism pedestal 41, second operation machine structure pedestal 42, the first pillar
Edge 43, the second support insulator 44, switch tool 45, switch driver 46, switch driving handle 47, switch transmission corner block
48, the first operating mechanism pedestal 41 and second operation machine structure pedestal 42 are installed on bracket partition 22, and the first pillar is exhausted
Edge 43 is mounted on the first operating mechanism pedestal 41, and the second support insulator 44 is mounted on second operation machine structure pedestal 42,
Described 45 one end of switch tool is connect with the first support insulator 43, and the other end is connect with the second support insulator 44, described to open
It closes 46 one end of driver to connect with switch tool 45, the end of the other end and switch transmission corner block 48 is hinged, and the switch passes
The middle part of dynamic corner block 48 and the first operating mechanism pedestal 41 are hinged, and the switch driving handle 47 is mounted on the first operating mechanism
On pedestal 41, and the output end for switching driving handle 47 connect with the middle part of switch transmission corner block 48 and drives switch transmission three
Hornblock 48 rotates；
The transformation mechanism 5 includes transformation upper yoke 51 and transformation lower yoke 52, and 52 lower end of transformation lower yoke passes through transformation
Supporting block is installed on 21 bottom end of transformation shell, spaced apart transformer winding 53 there are two installations on transformation lower yoke 52, and two
A transformer winding 53 is connect with transformation upper yoke 51, and is connected between two transformer windings 53 by winding coupling line 54
It connects, transformation copper bar 55 is also equipped on the winding coupling line 54, transformation copper bar 55 passes through transformation insulated column and transformation shell 21
Inner sidewall connection；
The resistor cabinet 1 includes resistance shell 11 and resistor 12, is sequentially connected from top to bottom inside resistance shell 11
Have first resistor support frame 13, second resistance support frame 14 and resistance partition 15, be equipped on the resistor 12 resistor into
Line 16 and several resistance copper bars 17, and 12 upper end of resistor is connected by the side wall of first resistor insulator 18 and resistance shell 11
It connects, 12 lower end of resistor is connect by second resistance insulator 19 with first resistor support frame 13, the first resistor support frame
13 lower ends are connected with resistance mesh enclosure 110, and the first current transformer 111, second electricity are equipped on second resistance support frame 14
Hindering between support frame 14 and resistance partition 15 is reserved resistor space 112；
The reactor cabinet 3 includes reactance shell 31 and reactor 32, inside the reactance shell 31 from top to bottom successively
It is connected with the first reactance support frame 33, the second reactance support frame 34 and reactance partition 35, reactance is installed on the reactor 32
The end of device inlet wire is hinged, and the switch is driven corner block, and 32 upper end of reactor passes through the first reactance insulator 37 and reactance
The side wall of shell 31 connects, and 32 lower end of reactor is connect by the second reactance insulator 38 with the first reactance support frame 33, described
First reactance support frame, 33 lower end is connected with reactance mesh enclosure 39, is equipped with the second current transformer on the second reactance support frame 34
310, it is reserved reactor space 311 between the second reactance support frame 34 and reactance partition 35；
It is respectively connected with outside 11 outside of resistance shell and reactance shell 31 and shutter 61 and ground wire entrance 62 is installed,
Cold dew device 63 and electric heater terminal 64 are mounted on the resistance partition 15 and reactance partition 35.
In actual work, method for arranging of the invention includes the following steps,
Step 1: first determining neutral ground scheme and device parameter by owner, design side and equipment producer,
Then according to the scheme determined, the equipment arrangement of turbine-generator units is carried out in workshop generator floor；
Step 2: the voltage rating U of generator is inputtedN, the single-phase total capacitance C over the ground of stator winding0, short circuit current limit value
IsafeWith transient overvoltage limit value Usafe, judge whether generator needs to be grounded, be if desired grounded, then neutral ground dress is installed
It sets, if not needing to be grounded, neutral earthing devices is not installed, wherein the decision condition whether generator is grounded includes single-phase
Whether earth current is more than whether permissible value and generator capacity are greater than 125MW；
Step 3: when determining that generator need to be grounded, being related to criterion according to power industry and judge whether that moment is required to cut machine,
If it is desired to which moment cuts machine, then using high reactance type earthing mode (through grounding through arc, the external common prior art), if not
It is required that moment cuts machine, then enter next step, that is, further determines selection impedance type earthing mode or high-ohmic type
Earthing mode；It should be noted that in the case where not requiring moment to cut machine, it can also be (external common using " high reactance " type
The prior art), but it needs to consider the factors such as neutral point displacement voltage, and the Overvoltage Amplitude relative to other two ways is inclined
Height, therefore the present invention does not recommend；
Step 4: according to the natural capacity electric current I of generatorc, compare natural capacity electric current IcWith short circuit current IsafeLimit
Value, ifThen consider high-ohmic type earthing mode, this is the prior art, and specific resistance value configuration method can be according to NB/
T 35067-2015 " hydraulic power plant's overvoltage protection and Insulation Coordination designing technique directive/guide "；IfThen consider impedance
Type earthing mode, into next step；
Step 5: according to the limit value of short circuit current and resistance R and reactance XLParameter configuration section determination formula,
Determine resistance R and reactance XLParameter configuration section, meanwhile, according to transient overvoltage limit value UsafeAnd the undercompensation of inductance value
Formula determines final resistance R and reactance XLIt is grounded parameter configuration mode；
Wherein, resistance R and reactance XLParameter configuration section determination formula it is as follows:
The undercompensation value interval of inductance value are as follows:
Wherein, formula (1) is suitable for tandem type, and formula (2) is suitable for parallel connection type, UNFor the voltage rating of generator, C0For
The single-phase total capacitance over the ground of stator winding, ω are angular frequency, and j is imaginary unit, IsafeFor short circuit current limit value, UsafeFor transient state mistake
Voltage limits, R are resistance, XLFor reactance, vlimFor the limit value of tuning-off degree as defined in fire protection technology；
Step 6: final grounding scheme configuration parameter is exported, and according to final resistance R and reactance XLIt is grounded parameter peace
Dress combination cabinet style impedance type generator neutral point earthing or grounding means.
In actual work, huge water wheel generator group impedance parameter determines that method includes the following steps,
S1: the voltage rating U based on generatorN, the single-phase total capacitance C over the ground of stator winding0, short circuit current safety limit
IsafeAnd resistance R and reactance XLParameter configuration section determination formula, determine resistance R and reactance XLParameter configuration area
Between, it is specific to determine that formula can refer to above-mentioned formula (1) and formula (2)；
S2: the resistance R and reactance X determined according to formula (1)LParameter configuration section, draw resistance R and reactance XLPass
It is curve；
S3: on (rather than in value interval) the corresponding resistance of above-mentioned steps S2 and reactance curve, and according to inductance value
Undercompensation section, in [XS0,+∞) in interval range, finds so that transient overvoltage Up is the numerical point of 2.6pu, determine at this time
Series resistance RSWith series inductance XSAs corresponding configuration parameter；Wherein, the undercompensation section of inductance value are as follows:Wherein, vlimFor the limit value of tuning-off degree as defined in fire protection technology；
S4: the resistance R and reactance X determined according to formula (2)LParameter configuration section, draw resistance R and reactance XLPass
It is curve；
S5: on (rather than in value interval) the corresponding resistance of above-mentioned S4 and reactance curve, and according to the underfill of inductance value
Section is repaid, in [XP0,+∞) in interval range, find so that transient overvoltage Up is the numerical point of 2.6pu, at this time determining string
Join resistance RpWith series inductance XpAs corresponding configuration parameter；Wherein, the undercompensation section of inductance value are as follows:
S6: combination technology economy and technical feasibility, and according to final resistance R and reactance XLIt is grounded parameter installation group
Close cabinet style impedance type generator neutral point earthing or grounding means.
In actual work, according to transient overvoltage limit value Usafe, using intelligent search algorithm, form final ground connection parameter
Configuration mode.
The concrete principle of intelligent search algorithm is: in determining search range, with certain step-length to the electricity in range
Resistance carries out analytical calculation with reactance value, and Automatic-searching meets the ground connection parameter configuration mode of transient overvoltage limit value requirement, specifically
Ground: the inductance value of arc suppression coil under the conditions of undercompensation for meeting tuning-off degree requirement, the primary election side of integrated ground parameter are first determined
Case；Further determine that the range of resistance R；After determining resistance and reactance search range, and then intelligent search algorithm is applied, found
Meet transient overvoltage limit value U in search rangesafeGround connection parameter configuration mode.
Other unaccounted parts belong to the prior art.
Claims (1)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820788457.7U CN208690935U (en) | 2018-05-25 | 2018-05-25 | Combined cabinet type impedance giant generator set neutral point grounding device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820788457.7U CN208690935U (en) | 2018-05-25 | 2018-05-25 | Combined cabinet type impedance giant generator set neutral point grounding device |
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| Publication Number | Publication Date |
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| CN208690935U true CN208690935U (en) | 2019-04-02 |
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| CN201820788457.7U Active CN208690935U (en) | 2018-05-25 | 2018-05-25 | Combined cabinet type impedance giant generator set neutral point grounding device |
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