CN206992714U - The wiring construction and wiring system of small steam turbine generator access high-voltage Auxiliary electric system - Google Patents
The wiring construction and wiring system of small steam turbine generator access high-voltage Auxiliary electric system Download PDFInfo
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- CN206992714U CN206992714U CN201720563240.1U CN201720563240U CN206992714U CN 206992714 U CN206992714 U CN 206992714U CN 201720563240 U CN201720563240 U CN 201720563240U CN 206992714 U CN206992714 U CN 206992714U
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Abstract
The utility model discloses a kind of wiring construction of small Turbo-generator Set access high-voltage Auxiliary electric system.The wiring construction includes：Small steam turbine generator G outlet is by connecting circuit breaker Q, isolating transformer and quick current-limiting device F by access auxiliary bus bar BUS；First voltage transformer PCT I is connected the outlet of small steam turbine generator (103)；Second voltage transformer (105) is by access bus (100)；First current transformer (106) is connected between the neutral point of small steam turbine generator (103) and grounding transformer (108), and grounding transformer (108) is grounded；Second current transformer (107) is connected between quick current-limiting device (102) and bus (100)；Quick current-limiting device (102) is provided with relay (109), and relay (109) is connected between the first current transformer (106) and the second current transformer (107).The utility model energy fast shut-off short trouble, effectively control the short circuit current level of power plant high-voltage Auxiliary electric system and improve the operational reliability of station service electrical system.
Description
Technical field
Electric field is the utility model is related to, is especially but not limited to be related to a kind of small steam turbine generator access HV auxiliary power s ystem
The wiring construction and wiring system of system.
Background technology
The vapours temperature of the big power station in China is typically up to 500~600 degrees Celsius, and pressure is up to tens MPas,
Considerably beyond the parameter request of the thermic load of domestic consumer, if carrying out heat supply after pressure and temperature reducing, energy loss can be caused.Therefore,
Large power plant can set the steam turbine of one or more low capacity, when HTHP pumping is after the steam turbine acting of low capacity
The low temperature and low pressure steam for meeting user's thermic load parameter can be changed into, so as to external heat supply, meanwhile, the steam turbine of low capacity is also
The acting of the plant equipment such as the air-introduced machine in power plant can be dragged or dragging small generators generate electricity.
For small turbine dragging small generators generate electricity for, no matter the thermal load demands of user how many, can will
Thermal energy differential is converted into electric energy.However, following difficulty can be present into small Turbo-generator Set access system, if selection access booster stations
System, then improvement project amount is very big, cost is very high and policy examination ＆ approval are difficult；If selection access high-voltage Auxiliary electric system, phase
It is more feasible for selection access booster stations system, but wiring construction can be limited to the short circuit electricity of former high-voltage Auxiliary electric system
The limitation of flow horizontal and circuit breaker trip short circuit current ability, it is impossible to small Turbo-generator Set is directly accessed into HV auxiliary power s ystem
System.
A kind of accordingly, it is desirable to provide small steam turbine generator for reliably, quickly dissolving the electric energy that small steam turbine generator provides
Access the wiring construction and wiring system of high-voltage Auxiliary electric system.
Utility model content
The purpose of this utility model, which is to provide one kind, can effectively improve cut-out short circuit current energy in high-voltage Auxiliary electric system
The wiring construction and operation method that small steam turbine generator is accessed to high-voltage Auxiliary electric system of power.By judging small turbine side
Short circuit current and HV auxiliary power bus side short circuit current magnitude relationship, flexibly control be connected with small steam turbine generator
Quick current-limiting device and breaker short trouble is cut off, greatly ensured small Turbo-generator Set generating safety.This reality
Further related to a kind of wiring system that small steam turbine generator is accessed to high-voltage Auxiliary electric system with new, describe by
The wiring construction of multiple small steam turbine generator unit access station service electrical systems, in situation about being powered using multiple small steam turbine generators
Under, can farthest ensure each small generators safe for operation and station service electrical system it is safe for operation, further, lead to
Cross and multiple quick current-limiting devices are set, when such as three phase short circuit fault occurs in high-voltage auxiliary bus, can quickly and flexibly cut
Disconnected short trouble；In addition, the utility model also has higher economy, the structure maintenance cost of power plant is saved.
The utility model provides a kind of wiring construction of small steam turbine generator access high-voltage Auxiliary electric system.
In one embodiment, small steam turbine generator (103) passes through series trip device (101) and quick current-limiting device (102) quilt
Access bus (100), the neutral point connection grounding transformer (108) and grounding transformer of small steam turbine generator (103)
(108) it is grounded；
First voltage transformer (104) is connected the outlet of small steam turbine generator (103)；
Second voltage transformer (105) is by access bus (100)；
First current transformer (106) is connected the neutral point and grounding transformer of small steam turbine generator (103)
(108) between；
Second current transformer (107) is connected between quick current-limiting device (102) and bus (100)；With
Quick current-limiting device (102) is provided with relay (109), and relay (109) is connected the first Current Mutual Inductance
Between device (106) and the second current transformer (107).
Preferably, the both sides of quick current-limiting device (102) are respectively arranged with disconnecting switch, quick current-limiting device (102) by every
Pass is left by access bus (100)；
Wherein, disconnecting switch is used to isolate quick current-limiting device (102) when quick current-limiting device (102) failure or maintenance.
Preferably, relay (109) is used for the short circuit current and quick current-limiting device for calculating small steam turbine generator (103) side
(102) whether the short circuit current of side is equal.
Preferably, wiring construction also includes isolating transformer (110), and isolating transformer (110) is connected breaker
(101) between small steam turbine generator (103), for reducing the short circuit current of small steam turbine generator (103) and isolating single-phase
Earthing capacitance current.
Another embodiment of the present utility model discloses a kind of wiring of small steam turbine generator access high-voltage Auxiliary electric system
The operation method of structure.
When small steam turbine generator (103) starts the same period, first voltage transformer (104) and second voltage transformer
(105) voltage of small steam turbine generator (103) and the voltage of bus (100) are gathered respectively, when the electricity of small steam turbine generator (103)
When amplitude, frequency and the phase angle of pressure meet synchronous voltage requirement, by controlling the combined floodgate of breaker (101) by small turbine generator
Machine (103) access bus (100)；
When high-voltage Auxiliary electric system short trouble occurs and fault current is more than or equal to quick current-limiting device protection seting
During working value, then quick current-limiting device (102) is cut off；When fault current is less than quick current-limiting device protection seting working value, then cut
The adjacent breaker in disconnected trouble point, and quick current-limiting device (102) is failure to actuate.
When there is short trouble in small generators circuit system, the first current transformer (106) and the second current transformer
(107) short circuit current of small steam turbine generator (103) side and quick current-limiting device (102) side is gathered respectively, if small steam turbine generator
(103) short circuit current of side is equal to the short circuit current of quick current-limiting device (102) side and short circuit current acts more than quick current-limiting device
During setting valve, then quick current-limiting device (102) is cut off, if the short circuit current of small steam turbine generator (103) side is not equal to quick current-limiting
When the short circuit current or short circuit current of device (102) side are no more than quick current-limiting device action setting valve, then breaker (101) is cut off；
Wherein, small generators circuit system includes small steam turbine generator (103), the outlet of small steam turbine generator, breaker
(101), the connection between the disconnecting switch and each device components of quick current-limiting device (102) and quick current-limiting device (102) both sides
Conductor.
Preferably, this method also includes：Breaker (101) is engaged with feeder breaker protection seting to cut off breaker
(101)。
Preferably, this method also includes：When small steam turbine generator (103) single-line to ground fault, isolating transformer (110)
Isolate the unbalanced earth fault capacitance current of high-voltage Auxiliary electric system.
A kind of connecing for small steam turbine generator access high-voltage Auxiliary electric system is disclosed in another embodiment of the present utility model
Linear system is united.The outlet of small steam turbine generator (203) is connected to the primary side of transformer with split winding (210), transformer with split winding (210)
One secondary side passes through the first breaker (201) and the first quick current-limiting device (202) the first bus of access (200) of connecting, division
Another secondary side of transformer (210) passes through the second breaker (301) and the second quick current-limiting device (302) access second of connecting
Bus (300)；
The neutral point of small steam turbine generator (203) is connected to grounding transformer (208), and grounding transformer (208) quilt
Ground connection；
First voltage transformer (204) is connected outlet and the transformer with split winding (210) of small steam turbine generator (203)
Between primary side；
Second voltage transformer (205) is by the first bus of access (200)；
Tertiary voltage transformer (305) is by the second bus of access (300)；
First current transformer (206) is connected the neutral point and grounding transformer of small steam turbine generator (203)
(208) between；
Second current transformer (207) is connected between the first quick current-limiting device (202) and the first bus (200),
3rd current transformer (307) is connected between the second quick current-limiting device (302) and the second bus (300)；
First quick current-limiting device (202) is provided with the first relay (209) and the first relay (209) is connected
Between one current transformer (206) and the second current transformer (207)；
Second quick current-limiting device (302) is provided with the second relay (309) and the second relay (309) is connected
Between one current transformer (206) and the 3rd current transformer (307).
Preferably, the both sides of the first quick current-limiting device (202) are additionally provided with disconnecting switch, the first quick current-limiting device (202)
By disconnecting switch by the first bus of access (200)；
Preferably, the both sides of the second quick current-limiting device (302) are additionally provided with disconnecting switch, the second quick current-limiting device (302)
By disconnecting switch by the second bus of access (300).
Preferably, the first relay (209) is quick for the short circuit current and first for judging small steam turbine generator (203) side
Whether the short circuit current of current limiter (202) side is equal.
Preferably, the second relay (309) is quick for the short circuit current and second for judging small steam turbine generator (203) side
Whether the short circuit current of current limiter (302) side is equal.
Another embodiment of the present utility model discloses a kind of wiring of small steam turbine generator access high-voltage Auxiliary electric system
The operation method of system.This method includes：
When the first bus (200) is short-circuit, small steam turbine generator (103) is switched by switching transformer with split winding (210)
To connection bus (300)；
When the second bus (300) is short-circuit, small steam turbine generator (103) is switched by switching transformer with split winding (210)
To connection bus (200).
It should be understood that in the scope of the utility model, above-mentioned each technical characteristic of the present utility model and below (strictly according to the facts
Apply example) in specifically describe each technical characteristic between can be combined with each other, so as to form new or preferable technical scheme.Limit
In length, no longer tire out one by one state herein.
Brief description of the drawings
Fig. 1 is the booster stations system of big power station and the schematic diagram of station service electrical system in the prior art.
Fig. 2 is the booster stations system of big power station in the prior art and the station service system for having accessed small Turbo-generator Set
The schematic diagram of system.
Fig. 3 is the schematic diagram of the one embodiment for the station service electrical system for having accessed small Turbo-generator Set in the prior art.
Fig. 4 is the signal of another embodiment of the station service electrical system for having accessed small Turbo-generator Set in the prior art
Figure.
Fig. 5 is the wiring knot of the small steam turbine generator access high-voltage Auxiliary electric system in one embodiment of the present utility model
The schematic diagram of structure.
Fig. 6 is the wiring of the small steam turbine generator access high-voltage Auxiliary electric system in another embodiment of the present utility model
The schematic diagram of structure.
Fig. 7 is the wiring of the small steam turbine generator access high-voltage Auxiliary electric system in another embodiment of the present utility model
The schematic diagram of structure.
Embodiment
The utility model people develops a kind of small steam turbine generator access high pressure factory first by in-depth study extensively
The wiring construction of electricity system, can when short trouble occurs in any one in station service bus and small steam turbine generator
The control quick current-limiting device and breaker of rapid sensitive are to reach the purpose of control short circuit current, so as to ensure station service electrical system
Operational reliability, more effectively dissolve the electric energy that small Turbo-generator Set provides and reduce station service power consumption rate, improve heat energy and
The utilization rate of electric energy.In terms of existing technologies, the utility model is also provided with detection short circuit except setting up quick current-limiting device
The current transformer of electric current, quick current-limiting device and breaker is controlled to cooperate to cut off according to the short circuit current level detected
Short trouble, and wiring construction is improved on the basis of original station service electrical system electrical main connecting wire, make small steam turbine generator
Can safely and smoothly it run.
Term
As used herein, term " auxiliary single-line diagram " refers in power plant, for rushing designed by power load power demands
Electrical wiring, it includes the circuit arrangement of house transformer, auxiliary switchgear, cable and station-service load.
As used herein, it is high-voltage Auxiliary electric load that term " HV auxiliary power bus ", which refers to for power plant auxiliary system,
Distribute the bus-bars conductor of electric energy.
As used herein, term " short trouble " refers to a phase or multiphase current－carrying conductor ground connection or obstructed overload mutually connects
Touch, due to the impedance very little of now trouble point, cause electric current moment to be increased sharply, the voltage before short dot declines, to power system
Safe operation it is totally unfavorable.
As used herein, term " breaker " refers to series connection with that in electric loop, can close, carry and cut-off normal loop
Under the conditions of electric current, and can close, carry and cut-off the switching device of the electric current under abnormal loop condition at the appointed time.
As used herein, term " quick current-limiting device " refer to a kind of series connection with electric loop, can be to fault current bag
Include the quick-speed turning on-off equipment that its maximum short circuit current peak value is effectively limited, can short trouble occur moment by its
Cut-out.
As used herein, term " voltage transformer " refers to one kind and (high pressure especially, is changed into low for conversion line voltage
Pressure) equipment, can be used for measurement circuitry or busbar voltage, with realize measurement, protection, control purpose.
As used herein, term " primary side " refers to the winding of the electric energy input side in multiwinding transformer, and term is " secondary
Side " refers to other windings of electric energy outlet side.
The wiring construction of small Turbo-generator Set access high-voltage Auxiliary electric system
Major advantage of the present utility model includes：
(a) fast shut-off short trouble
(b) station service power consumption rate is reduced
(c) operational reliability is improved
With reference to specific embodiment, the utility model is expanded on further.It should be understood that these embodiments are merely to illustrate this
Utility model rather than limitation the scope of the utility model.The experimental method of unreceipted actual conditions in the following example, lead to
Often according to normal condition, or according to the condition proposed by manufacturer.Unless otherwise indicated, otherwise percentage and number are weight
Percentage and parts by weight.
It should be noted that in the claim and specification of this patent, such as first and second or the like relation
Term is used merely to make a distinction an entity or operation with another entity or operation, and not necessarily requires or imply
Any this actual relation or order be present between these entities or operation.Moreover, term " comprising ", "comprising" or its
Any other variant is intended to including for nonexcludability so that process, method, article including a series of elements or
Equipment not only includes those key elements, but also the other element including being not expressly set out, or also include for this process,
Method, article or the intrinsic key element of equipment.In the absence of more restrictions, wanted by what sentence " including one " limited
Element, it is not excluded that other identical element in the process including key element, method, article or equipment also be present.
Fig. 1 is the structure of the electrical main connecting wire of big power station in the prior art, including high voltage distribution installation and station service
System.The electric energy that big power station sends needs to boost by main transformer, then delivers to power network by high voltage distribution installation, together
When, the station service in power plant is by being obtained after HV Auxiliary Transformer (hereinafter referred to as " high factory becomes ") decompression.As shown in figure 1,
The Current Voltage that big generator A is provided is linked into high voltage bus BUS A, big generator B is carried after main transformer A boostings
The Current Voltage of confession is linked into high voltage bus BUS B after main transformer B boostings.Big generator A, which is additionally provided with, is connected to height
Factory becomes A branch road, therefore generator A portion of electrical current voltage is after too high factory becomes A decompression processing greatly, by access high-voltage Auxiliary
I section of electric system bus BUS A and II section of BUS A, station-service electric load electricity consumption motivation M are represented, then the motor in factory is from bus BUS
I section and II section acquisition electric energy of A.Similarly understand, II section of I section of bus BUS B and BUS B become B from high factory and receive the electric power of decompression simultaneously
Powered to station-service electric load.
High voltage distribution installation includes high voltage bus A and high voltage bus B, and circuit 1 and circuit 2 are respectively from high voltage bus A and height
Bus B power takings are pressed, except the equipment of diagram, high voltage distribution installation is also opened including unshowned breaker, disconnecting switch, ground connection
Pass, current transformer, voltage transformer, arrester etc..Circuit 1 and circuit 2 are connected to power network, are responsible for power plant generation
Power Transmission is to power network.
Fig. 2 is by small Turbo-generator Set access high voltage power distribution dress on the basis of the electrical main connecting wire structure shown in Fig. 1
The schematic diagram put.As shown in Fig. 2 the Current Voltage that small steam turbine generator provides is through too small machine step-up transformer (referred to as " small machine liter
Buckling ") boosting after, electric power is sent to high voltage distribution installation, and then is sent to bulk power grid.Small generators loop rises except being configured with
Pressure transformer, it is also configured with the breaker interval for high voltage distribution installation.Relative to Fig. 1 power plant original electrical main connecting wire knot
Structure is, it is necessary to set up boosting change, set up the voltage class at least 220kV or 500kV even 1000kV of high voltage distribution installation, low capacity
Generator access high-voltage fence is uneconomical, and cost of equipment is millions of or even up to ten million, plus the second modified equipment complexity, construction
Cycle is grown.And key is that newly-increased small machine access power network needs access system to examine, flow is complicated, and general power plant does not take into account that.
Fig. 3 is the islet operation schematic diagram of the prior art using small steam turbine generator to station-service electric load.Isolated island is transported
Row is a kind of mode that high-voltage Auxiliary electric system departs from bulk power grid operation.As shown in figure 3, small generators G is connected to small machine orphan
The island operation plant equipment motor such as bus, blower fan, water pump is directly connected to islet operation bus also by breaker.Cause
This, the point that small steam turbine generator is sent is dissolved by the station-service electric load of islet operation.The electric load general power of power supply and small steamer
Generator power matches.If small turbine is back pressure machine, then if to ensure that generator frequency is stable, back pressure machine needs
Hot mode operation is determined with electricity, i.e., the power that small machine is sent will change with the changed power of the electric load of isolated power grid, control
Compare responsible, do not born with the method for operation of back pressure machine economic and reliable, small back pressure machine generally requires electricity determining by heat mode and run；If
Small turbine uses pure condensate machine, then heat capacity reduces, and full factory's whole efficiency reduces.
Fig. 4 is the signal of the prior art that small steam turbine generator is directly accessed to high-voltage auxiliary bus by breaker
Figure.As shown in figure 4, small generators G and multiple motor, by access high-voltage auxiliary bus BUS1, high factory, which becomes, carries big generator G1
The some electrical power of confession handles backward motor by boosting, while small generators G supplies also by bus BUS1 to motor
Electricity, the electric energy that small generators provide are dissolved by high-voltage Auxiliary electric system.However, the small steam turbine generator access high pressure shown in Fig. 4
The wiring construction of station service electrical system can not effectively control the short circuit current level of station service electrical system, easily be made when there is short trouble
Into electrical equipment the damage even person and fire incident, and in this wiring construction, the energy of circuit breaker trip short circuit current
Power is limited., will be by high-voltage auxiliary bus short circuit electricity for the small generators access system main electrical scheme structure of prior art accompanying drawing 4
The limitation of flow horizontal and breaker disjunction short circuit current ability.In general the short circuit current of big power station's high-voltage auxiliary bus
Tolerance level and breaker breaking capacity be usually two grades of 40kA or 50kA, peak value tolerance electric current typically in 100kA or
Two grades of 125kA, and actual maximum short circuit current is typically also close to this numerical limitations.If small generators are passed through into open circuit
Device accesses high-voltage Auxiliary electric system, and when system short-circuit, small generators will inject extra short circuit current as power supply point, typically
In several kA to more than ten kA.Tend to exceed the tolerance of high-voltage Auxiliary electric system, most of power plant all can not be along adopting
With this wiring technique.
Electrical main connecting wire structure according to Fig. 1~4, embodiment of the present utility model have made further improvement, can
Short circuit current and cut-out short trouble are effectively flexibly controlled, greatly reduces station service power consumption rate.By in small steam turbine generator
Quick current-limiting device is installed between high-voltage auxiliary bus, small steam turbine generator is provided when limiting HV auxiliary power s ystem system short-circuit
Short circuit current, when making former high-voltage Auxiliary electric system inner breaker cut-out short trouble, small generators do not provide extra short circuit
Electric current or system short-circuit electric current are no more than equipment tolerance in system and have no effect on equipment normal work in original system.
Fig. 5 is the wiring knot of the small steam turbine generator access high-voltage Auxiliary electric system in one embodiment of the present utility model
The schematic diagram of structure.The wiring construction includes the wiring construction of original high-voltage Auxiliary electric system, that is, includes being connected to booster stations system
Main transformer, the high factory that is connected on the big generator G1 and big generator G1 power supplies branch road of main transformer becomes.Except this it
Outside, wiring construction 100 also includes：HV auxiliary power bus BUS I (100), circuit breaker Q 1 (101), quick current-limiting device F1 (102),
Small generators G (103), voltage transformer pt I (104), voltage transformer pt II (105), Current Transmit I (106), electricity
Current transformer CT II (107), grounding transformer (108) and relay (109)；Also include：HV auxiliary power bus BUS II
And voltage transformer pt III (201) (200)
As shown in figure 5, the phase that high factory becomes is connected on big generator G1 outlets, two-phase is respectively connected to bus BUS I in addition
And bus BUS II (200) (100).The outlet of small steam turbine generator G (103) passes through circuit breaker Q 1 (101) and quick current-limiting device F1
(102) HV auxiliary power bus BUS I (100) is connected to, the neutral point of small steam turbine generator (103) is connected to ground connection transformation
Device (108), grounding transformer (108) are then grounded.Also, voltage transformer pt I (104) is connected to small generators G
(103) on the circuit between circuit breaker Q 1 (101), that is, small generators G (103) outlet is to detect small generators G's
Voltage.Current Transmit I is provided between the neutral point and grounding transformer (108) of small steam turbine generator (103)
(106).Voltage transformer pt II (105) is directly accessed bus BUS I (100), for detecting the voltage of bus (100).
Quick current-limiting device F1 (102) both sides are provided with disconnecting switch, and current limiter F1 (102) is accessed by disconnecting switch
Bus BUS I (100), and Current Transmit II (107) is arranged close to quick current-limiting device F1 (102) any side.
The effect of disconnecting switch is to isolate quick current-limiting device with electrical main connecting wire when safeguarding and overhauling quick current-limiting device, ensures construction
The safety of personnel.
The structure of quick current-limiting device as shown in Figure 5, quick current-limiting device be one kind be series in electric loop, can be to failure
Electric current includes the quick-speed turning on-off equipment that its maximum short circuit current peak value is effectively limited, and its working value can pass through Electronic Control
Device is adjusted：Once meeting or exceeding the short circuit current of setting valve, can generally be acted in 5~10ms, and in short circuit current
The initial stage of rising starts current limliting, and fault current is also not up to maximum when cut-offfing completion, much smaller than prospective short circuit current peak value.
So before prospective short circuit current is not up to peak value, short circuit current is got off by limitation, avoids main equipment by short-circuit electricity
Power is damaged, and the thermostabilization for more avoiding conductor and electrical equipment is destroyed., mainly can be with according to the operation principle of quick current-limiting device
It is divided into three kinds：First, the fault current limiter based on Power Electronic Technique, is mainly used in high voltage power transmission and transforming system；Second, it is based on explosion
The quick current-limiting device of cutting technique, is widely used in intermediate distribution system；Third, the quick current-limiting device of based superconductive technology.In this reality
Apply in example, using the quick current-limiting device for high voltage power transmission and transforming circuit.
Quick current-limiting device F1 (102) is additionally provided with IS current direction relays (109), and relay (109) is connected in series in
Between Current Transmit I (106) summation current transformer CT II (107), for judging the direction of short circuit current, according to judgement
As a result selection cut-out quick current-limiting device F1 (102) or circuit breaker Q 1 (101).
In the present embodiment, it is necessary to first adjust small steamer rotating speed before by small steam turbine generator access station service electrical system
Stable state is in voltage, voltage transformer pt I (104) obtains small generators exit potential Ug, voltage transformer pt 2
(105) bus BUS1 (100) voltage Ubus, when Ug amplitude, frequency and phase angle are close or equal to Ubus, control are obtained
Circuit breaker Q 1 (101) asynchronous switch-on is with by small generators G (103) access station service electrical main electrical scheme.Small generators G (103) output
Power is changed by controlling the output of small turbine (being connected with small generators G, Fig. 5 is not shown).
After small Turbo-generator Set is accessed, the electric current on bus is made up of the following group：High factory becomes the electric current provided, motor
The electric current that the electric current and small generators G of M feedbacks provide.When three phase short circuit fault occurs for station service bus BUS I (100),
Short circuit current signal is simultaneously delivered to fast speed limit by the short circuit current of Current Transmit II (107) detection bus BUS I (100) offers
Flow device F1 (102).Quick current-limiting device F1 (102) function is：Adaptive setting, judgement are carried out to the short circuit current signal of reception
Short circuit current rate of change and output a control signal to circuit breaker Q 1 (101).Short circuit current on bus is sine wave, therefore quickly
Current limiter F1 (102) obtains sinusoidal current signal from Current Transmit II (107), estimates the peak-peak of the current signal
With the rate of change (reflection bus on short circuit current change) for detecting the current signal, once the peak-peak and change rate signal are equal
More than the threshold value set in F1, then quick current-limiting device F1 will be in 5ms internal cutting off short circuit currents.In fact, on bus now most
Big short circuit current is also not up to its peak value, therefore can ensure the safety in small Turbo-generator Set loop.Further, 40~
Bus BUS I (100) service power lead-in circuit breaker or feeder breaker (not shown) will start to move after 60ms
Make, that is, cut off high factory's change or motor and the loop of busbar short-circuit failure, therefore need not consider that short circuit occurs in small generators side
Situation, that is, influence of the short circuit current for not having to consider small generators offer to high-voltage Auxiliary power distribution equipment ability to bear.Due to fast
The quick acting of fast current limiter F1 (102), can ensure the safe for operation of station service electrical system.
Once short trouble occurs for station service bus BUS1 (100), the fault current that quick current-limiting device F1 (102) is calculated
When prospective peak value sets threshold value less than in, then circuit breaker Q 1 (101) is output a control signal to, to control the disconnected of circuit breaker Q 1 (101)
Open, so as to which the link circuit of small Turbo-generator Set and bus be disconnected.It should be noted that the circuit breaker Q 1 of small generators outlet
(101) disjunction is to be engaged execution with feeder breaker protection seting.
Once small generators side is short-circuit, then the maximum during short circuit current is selected from the group：High factory becomes the short circuit current provided
With short circuit current motor M feedback current and/or that small generators side provides, the maximum should be no more than circuit breaker Q 1
(101) rated short circuit current breaking capacity.Specifically, it is provided with quick current-limiting device F1 (102) and is used to judge short circuit current
The IS current direction relays (109) in direction.When short trouble occurs for small Turbo-generator Set loop, Current Transmit
The electric current Ict1 and Current Transmit II of I detection small generators side detect the electric current being connected on bus BUS1 loop
(i.e. the electric current of quick current-limiting device F1 sides) Ict2, if quick current-limiting device F1 judges Ict1=Ict2, illustrates the flow direction of short circuit current
It is from small Turbo-generator Set to bus BUS1, then cuts off quick current-limiting device F1 (102)；If quick current-limiting device F1 judge Ict1 ≠
Ict2, illustrate that short trouble occurs between quick current-limiting device and small generators, i.e. the flow direction of short circuit current is from bus BUS1
To small generators, then circuit breaker Q 1 performs cutoff action.
Another embodiment of the present utility model discloses a kind of wiring of small steam turbine generator access high-voltage Auxiliary electric system
The operation method of structure.This method comprises the following steps：
When small steam turbine generator G (103) starts the same period, voltage transformer pt I (104) and voltage transformer pt II
(105) voltage of small steam turbine generator G (103) and bus BUS I (100) voltage are gathered respectively, as small steam turbine generator G
(103) when amplitude, frequency and the phase angle of voltage meet synchronous voltage requirement, by controlling the combined floodgate of circuit breaker Q 1 (101) will
Small steam turbine generator G (103) access bus (100)；
When high-voltage Auxiliary electric system short trouble occurs and fault current is more than or equal to quick current-limiting device protection seting
During working value, then quick current-limiting device F1 (102) is cut off；When fault current is less than quick current-limiting device protection seting working value, then
The adjacent breaker of disengagement failure point, and quick current-limiting device F1 (102) is failure to actuate.
When there is short trouble in small generators circuit system, Current Transmit I (106) summation current transformer CT II
(107) short circuit current of small steam turbine generator G (103) sides and quick current-limiting device F1 (102) side is gathered respectively, if small turbine generator
The short circuit current of machine G (103) side is equal to the short circuit current of quick current-limiting device F1 (102) side and short circuit current exceedes quick current-limiting device
When acting setting valve, then quick current-limiting device F1 (102) is cut off, if the short circuit current of small steam turbine generator G (103) side is not equal to fast
When the short circuit current or short circuit current of fast current limiter F1 (102) side are no more than quick current-limiting device action setting valve, then cut-out open circuit
Device Q1 (101)；
Wherein, small generators circuit system includes small steam turbine generator (103), the outlet of small steam turbine generator, breaker
(101), the disconnecting switch of quick current-limiting device (102) and quick current-limiting device (102) both sides, the connection between each device components are led
Body.
Fig. 6 is the further embodiment according to Fig. 5.As shown in fig. 6, on Fig. 5 wiring construction, small steam turbine generator
Side is additionally arranged small machine isolating transformer (hereinafter referred to as " isolation become "), isolation become (110) be connected circuit breaker Q 1 (101) and
Between voltage transformer pt 1 (104).Isolation, which becomes (110), can reduce the short circuit current of small generators side offer, and work as small hair
During motor single phase ground fault, isolation becomes the unbalanced earth fault capacitance current that can isolate station service electrical system offer.In this reality
Apply in example, isolation change is isolation two-fold transformer.
Fig. 7 is the wiring of the small steam turbine generator access high-voltage Auxiliary electric system in further embodiment of the present utility model
The schematic diagram of structure.Wiring construction shown in Fig. 7 is the wiring that small Turbo-generator Set is accessed to two sections of HV auxiliary power bus
Structure.As shown in fig. 7, the wiring construction includes bus BUS I (200), bus BUS II (300), circuit breaker Q 1 (201), open circuit
Device Q2 (301), quick current-limiting device F1 (202), quick current-limiting device F2 (302), small Turbo-generator Set G (203), voltage transformer
PT I (204), voltage transformer pt II (205), voltage transformer pt III (305), Current Transmit I (206), Current Mutual Inductance
Device CT II (207), Current Transmit III (307), grounding transformer (208), IS relays (209), IS relays
(309), and transformer with split winding (210) is isolated, and access bus BUS I and BUS II motor, high factory become, big generator G1
With main transformer etc..
As shown in fig. 7, the outlet of small steam turbine generator G (203) is connected to the primary side of isolation transformer with split winding (210),
A secondary side for isolating transformer with split winding (210) is accessed by series trip device Q1 (201) and quick current-limiting device F1 (202)
Bus BUS I (200), another secondary side of isolation transformer with split winding (210) pass through series trip device Q2 (301) and fast speed limit
Flow device F2 (302) access bus BUS II (300)；The neutral point of small steam turbine generator G (203) is connected to grounding transformer
(208), and grounding transformer (208) is grounded；Voltage transformer pt I (204) is connected small steam turbine generator (203)
Between outlet and the primary side of transformer with split winding (210)；Voltage transformer pt II (205) is by the first bus of access (200)；Voltage
Transformer PT III (305) is by access bus BUS II (300)；Current Transmit I (206) is connected small steam turbine generator G
(203) between neutral point and grounding transformer (208)；Current Transmit II (207) is connected quick current-limiting device F1
(202) between bus BUS I (200), Current Transmit III (307) is connected quick current-limiting device F2 (302) and bus
Between BUS II (300)；Quick current-limiting device F1 (202) is provided with IS relays (209) and IS relays (209) are connected
Between Current Transmit I (206) summation current transformer CT II (207)；Quick current-limiting device F2 (302) is provided with IS relays
Relay (309) and IS relays (309) are connected Current Transmit I (206) summation current transformer CT III (307)
Between.IS relays (209) are used for short circuit current and quick current-limiting device F1 (202) side for judging small steam turbine generator (203) side
Short circuit current it is whether equal.IS relays (309) are used for the short circuit current for judging small steam turbine generator (203) side and quick
Whether the short circuit current of current limiter F2 (302) side is equal.Quick current-limiting device F1 and F2 both sides are provided with disconnecting switch, and F1 leads to
Cross disconnecting switch by access bus BUS1, F2 by disconnecting switch by access bus BUS II.It can be incited somebody to action by wiring construction 200
Electric energy caused by small steam turbine generator is respectively connected to two sections of bus BUS I and BUS II, so as to avoid two sections of bus BUS I and BUS II
The problem of load unbalanced, voltage difference is big because small generators access causes, high factory becomes loss increase.
According to the characteristic of transformer with split winding, electromagnetic connection is very weak between two division windings of transformer with split winding, is not required to examine
Circulation problem and short circuit current are considered circulated between dividing winding the problem of.It is short that three-phase occurs for any one section of bus of BUSI and BUS II
Road failure, it is only necessary to which the loop that cut-out isolation division becomes in two division windings, small generators can pass through another time
Another section of bussed supply of road direction, improves small machine reliability of operation to a certain extent, also ensure that the reliable of heat supply during heat supply
Property.
The wiring construction of small steam turbine generator access high-voltage Auxiliary electric system as shown in Figure 7, it is of the present utility model another
Embodiment discloses a kind of operation method of the wiring system of small steam turbine generator access high-voltage Auxiliary electric system.This method bag
Include：
When bus BUS I (200) is short-circuit, small steam turbine generator G (103) is cut by switching transformer with split winding (210)
Change to connection bus (300)；
When bus BUS II (300) is short-circuit, small steam turbine generator (103) is cut by switching transformer with split winding (210)
Change to connection bus (200).
Claims (9)
- A kind of 1. wiring construction of small steam turbine generator access high-voltage Auxiliary electric system, it is characterised in thatThe outlet of small steam turbine generator (103) is by series trip device (101) and quick current-limiting device (102) by access bus (100), the neutral point connection grounding transformer (108) and the grounding transformer (108) of the small steam turbine generator (103) It is grounded；First voltage transformer (104) is connected the outlet of the small steam turbine generator (103)；Second voltage transformer (105) is accessed the bus (100)；First current transformer (106) is connected the neutral point and grounding transformer (108) of the small steam turbine generator (103) Between；Second current transformer (107) is connected between the quick current-limiting device (102) and the bus (100)；WithThe quick current-limiting device (102) is provided with relay (109), and the relay (109) is connected described first Between current transformer (106) and second current transformer (107).
- 2. wiring construction as claimed in claim 1, it is characterised in that the both sides of the quick current-limiting device (102) are set respectively There is disconnecting switch, the quick current-limiting device (102) is by the disconnecting switch by access bus (100)；Wherein, the disconnecting switch is used for the quick current-limiting device when quick current-limiting device (102) failure or maintenance (102) isolate.
- 3. wiring construction as claimed in claim 1, it is characterised in that the relay (109) is used to judge the small steamer Whether the short circuit current of generator (103) side and the short circuit current of the quick current-limiting device (102) side are equal.
- 4. wiring construction as claimed in claim 1, it is characterised in that also including isolating transformer (110), the isolation transformation Device (110) is connected between the breaker (101) and the small steam turbine generator (103), for reducing the small steamer The short circuit current of generator (103) and isolate unbalanced earth fault capacitance current.
- A kind of 5. wiring system of small steam turbine generator access high-voltage Auxiliary electric system, it is characterised in thatThe outlet of small steam turbine generator (203) is connected to the primary side of transformer with split winding (210), the transformer with split winding (210) A secondary side pass through connect the first breaker (201) and the first quick current-limiting device (202) access the first bus (200), institute Another secondary side for stating transformer with split winding (210) is connect by the second breaker of series connection (301) and the second quick current-limiting device (302) Enter the second bus (300)；The neutral point of the small steam turbine generator (203) is connected to grounding transformer (208), and the grounding transformer (208) it is grounded；First voltage transformer (204) is connected the outlet of the small steam turbine generator (203) and the transformer with split winding (210) between primary side；Second voltage transformer (205) is accessed first bus (200)；Tertiary voltage transformer (305) is accessed second bus (300)；First current transformer (206) is connected the neutral point and grounding transformer (208) of the small steam turbine generator (203) Between；Second current transformer (207) be connected the first quick current-limiting device (202) and first bus (200) it Between,3rd current transformer (307) be connected the second quick current-limiting device (302) and second bus (300) it Between；The first quick current-limiting device (202) is provided with the first relay (209) and first relay (209) is connected Between first current transformer (206) and second current transformer (207)；The second quick current-limiting device (302) is provided with the second relay (309) and second relay (309) is connected Between first current transformer (206) and the 3rd current transformer (307).
- 6. wiring system as claimed in claim 5, it is characterised in that the both sides of the first quick current-limiting device (202) are also set Disconnecting switch is equipped with, the first quick current-limiting device (202) is accessed first bus (200) by the disconnecting switch.
- 7. wiring system as claimed in claim 5, it is characterised in that the both sides of the second quick current-limiting device (302) are also set Disconnecting switch is equipped with, the second quick current-limiting device (302) is by the disconnecting switch by the second bus of access (300).
- 8. wiring system as claimed in claim 5, it is characterised in that first relay (209) is described small for judging Whether the short circuit current of steam turbine generator (203) side and the short circuit current of the first quick current-limiting device (202) side are equal.
- 9. wiring system as claimed in claim 5, it is characterised in that second relay (309) is described small for judging Whether the short circuit current of steam turbine generator (203) side and the short circuit current of the second quick current-limiting device (302) side are equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720563240.1U CN206992714U (en) | 2017-05-19 | 2017-05-19 | The wiring construction and wiring system of small steam turbine generator access high-voltage Auxiliary electric system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720563240.1U CN206992714U (en) | 2017-05-19 | 2017-05-19 | The wiring construction and wiring system of small steam turbine generator access high-voltage Auxiliary electric system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964112A (en) * | 2017-05-19 | 2018-12-07 | 中国电力工程顾问集团华东电力设计院有限公司 | The wiring construction and its operation method of small steam turbine generator access high-voltage Auxiliary electric system |
| CN109672222A (en) * | 2018-12-26 | 2019-04-23 | 山东电力工程咨询院有限公司 | Grid-connected system and method based on two-shipper heat regenerative system with power-balance generator |
| CN110261737A (en) * | 2019-07-09 | 2019-09-20 | 安徽亚辉电气技术有限公司 | A kind of smart grounding route selection complexes |
-
2017
- 2017-05-19 CN CN201720563240.1U patent/CN206992714U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964112A (en) * | 2017-05-19 | 2018-12-07 | 中国电力工程顾问集团华东电力设计院有限公司 | The wiring construction and its operation method of small steam turbine generator access high-voltage Auxiliary electric system |
| CN109672222A (en) * | 2018-12-26 | 2019-04-23 | 山东电力工程咨询院有限公司 | Grid-connected system and method based on two-shipper heat regenerative system with power-balance generator |
| CN110261737A (en) * | 2019-07-09 | 2019-09-20 | 安徽亚辉电气技术有限公司 | A kind of smart grounding route selection complexes |
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