CN211405907U - Excitation loop of emergency diesel generator of million-kilowatt nuclear power station - Google Patents
Excitation loop of emergency diesel generator of million-kilowatt nuclear power station Download PDFInfo
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- CN211405907U CN211405907U CN201921858889.1U CN201921858889U CN211405907U CN 211405907 U CN211405907 U CN 211405907U CN 201921858889 U CN201921858889 U CN 201921858889U CN 211405907 U CN211405907 U CN 211405907U
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Abstract
The utility model relates to a nuclear power station emergency power supply technical field especially relates to a million kilowatt level nuclear power station emergency diesel generator excitation circuit, include: the excitation control circuit comprises a direct current positive input end, a direct current negative input end, a field suppression switch, a first current acquisition unit, a second current acquisition unit, an excitation winding and an excitation adjusting unit; wherein: the direct-current positive input end and the direct-current negative input end are used for providing direct current for an excitation loop of the emergency diesel generator; the de-excitation switch is used for providing excitation current; the excitation winding is used for generating terminal voltage; the first current acquisition unit is used for acquiring and displaying the exciting current; the second current acquisition unit is used for acquiring the exciting current and feeding the exciting current back to the excitation regulation unit; the excitation adjusting unit is used for adjusting the excitation current. The utility model discloses a first current acquisition unit and second current acquisition unit have realized the accurate collection to exciting current.
Description
Technical Field
The utility model relates to a nuclear power station emergency power source technical field especially relates to a million kilowatt level nuclear power station emergency diesel generator excitation circuit.
Background
The million-kilowatt pressurized water reactor nuclear power station has become the most popular nuclear power station in the world due to the obvious characteristics of compact structure and better safety and economy. The emergency diesel generating set is the most important safety emergency power supply of the nuclear power plant designed by the concept of 'deep defense' of the nuclear power plant, and forms a multi-channel redundant power supply system of the nuclear power plant factory power supply together with other power supplies of the nuclear power plant. The safety-level emergency power supply is used as a safety-level emergency power supply for ensuring that a reactor can be maintained at a controllable safety level during the operation and accident of a nuclear power station and preventing the occurrence or diffusion of the nuclear accident, and the reliability and the availability of the safety-level emergency power supply are required to be ensured.
The existing nuclear power plant 1&2LHP/Q (1, 2 are nuclear motor group numbers, LHP and LHQ are emergency power supply systems) system diesel generator excitation adjusting equipment is main control equipment of the LHP/Q system, and the main function is to provide excitation current for an emergency diesel generator, so that the emergency diesel generator builds voltage and provides reactive power. However, the existing excitation loop has the problem that the operation control of an excitation system is not accurate and reliable because the excitation current sampling is not accurate enough.
SUMMERY OF THE UTILITY MODEL
On the basis, the excitation circuit of the emergency diesel generator of the million-kilowatt nuclear power station is needed to be provided aiming at the problem that the operation control of an excitation system is not accurate and reliable due to the fact that the sampling of the excitation current of the existing excitation circuit is not accurate enough.
An emergent diesel generator excitation circuit of million kilowatt level nuclear power station includes: the excitation control circuit comprises a direct current positive input end, a direct current negative input end, a field suppression switch, a first current acquisition unit, a second current acquisition unit, an excitation winding and an excitation adjusting unit; the de-excitation switch, the first current acquisition unit, the second current acquisition unit and the excitation winding are connected in series between the direct current positive input end and the direct current negative input end, the excitation regulation unit is connected with the second current acquisition unit, wherein:
the direct-current positive input end and the direct-current negative input end are used for providing direct current for an excitation loop of the emergency diesel generator;
the de-excitation switch is used for providing excitation current for the excitation loop of the emergency diesel generator to form a passage when the de-excitation switch is closed;
the excitation winding is used for enabling the emergency diesel generator to generate generator terminal voltage when the excitation current passes through;
the first current acquisition unit is used for acquiring and displaying the excitation current;
the second current acquisition unit is used for acquiring the excitation current and feeding back the excitation current to the excitation regulation unit;
and the excitation adjusting unit adjusts the direct current provided by the excitation loop of the emergency diesel generator according to the excitation current, and then adjusts the excitation current.
In one embodiment, the second current collecting unit includes a hall element, and the hall element is configured to collect the excitation current and feed back the excitation current to the excitation adjusting unit.
In one embodiment, the first current collecting unit includes a current divider for collecting the excitation current and an ammeter for displaying the excitation current.
In one embodiment, the field suppression switch includes a first main contact, a second main contact and an auxiliary contact, and the emergency diesel generator excitation circuit further includes a field suppression resistor, wherein:
the first main contact is connected between the direct current positive input end and the first current acquisition unit;
the second current acquisition unit is connected between the first current acquisition unit and the first end of the excitation winding;
the second main contact is connected between the second end of the excitation winding and the direct current negative input end;
the auxiliary contact and the de-excitation resistor are connected in series between the first end of the excitation winding and the second end of the excitation winding.
In one embodiment, the excitation regulating unit comprises an excitation regulator and a power rectifier, the excitation regulator is connected between the second current collecting unit and the control end of the power rectifier, the input end of the power rectifier is connected with the three-phase output end of the emergency diesel generator, and the output end of the power rectifier is connected with the direct-current positive input end and the direct-current negative input end; the excitation regulator is used for regulating the power rectifier according to a machine end target voltage, the voltage and the current output by the emergency diesel generator and the excitation current, and further regulating the direct current provided by the excitation loop of the emergency diesel generator so as to regulate the excitation current.
In one embodiment, the emergency diesel generator excitation circuit further comprises a third current collection unit and a voltage collection unit, wherein:
the third current collecting unit is connected between the emergency diesel generator and the excitation regulator and is used for collecting the current output by the emergency diesel generator and outputting the current output by the emergency diesel generator to the excitation regulator;
the voltage acquisition unit is connected between the emergency diesel generator and the excitation regulator and used for acquiring the voltage output by the emergency diesel generator and outputting the voltage output by the emergency diesel generator to the excitation regulator.
In one embodiment, the third current collecting unit comprises a current transformer, and the current transformer is used for collecting and converting the current output by the emergency diesel generator and outputting the current to the excitation regulator;
the voltage acquisition unit comprises a voltage transformer, and the voltage transformer is used for acquiring and converting the voltage output by the emergency diesel generator and then outputting the voltage to the excitation regulator.
In one embodiment, the emergency diesel generator excitation circuit further comprises a freewheeling resistor connected between the positive dc input terminal and the negative dc input terminal.
In one embodiment, the emergency diesel generator excitation circuit further comprises an excitation starting circuit, and the excitation starting circuit is connected with the direct-current positive input end and the direct-current negative input end.
In one embodiment, the excitation loop comprises an excitation switch, an excitation current limiting resistor and a diode; one main contact of the excitation starting switch, the excitation starting current limiting resistor and the diode are connected between the positive input end of 125V and the direct current positive input end in series, and the other main contact of the excitation starting switch is connected between the negative input end of 125V and the direct current negative input end.
Above-mentioned emergent diesel generator excitation circuit of million kilowatt level nuclear power station has realized the accurate collection to exciting current through first current acquisition unit and second current acquisition unit, has solved current excitation circuit and has had because of exciting current sampling is accurate inadequately, leads to the not accurate reliable problem of operation control to excitation system inadequately.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, drawings of other embodiments can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an excitation circuit of an emergency diesel generator of a million kilowatt nuclear power station according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an excitation loop of an emergency diesel generator of a million kilowatt nuclear power station according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, it is a schematic diagram of an excitation circuit of an emergency diesel generator of a million kilowatt-level nuclear power station provided in an embodiment of the present invention, as shown in fig. 2, it is a circuit diagram of an excitation circuit of an emergency diesel generator of a million kilowatt-level nuclear power station provided in an embodiment of the present invention; this emergent diesel generator excitation circuit of million kilowatt level nuclear power station includes: a direct current positive input end +, a direct current negative input end-, a de-excitation switch 200, a first current collecting unit 300, a second current collecting unit 400, an excitation winding 500 and an excitation adjusting unit 600. The field suppression switch 200, the first current collection unit 300, the second current collection unit 400 and the excitation winding 500 are connected in series between the dc positive input terminal + and the dc negative input terminal (the series relation is not limited to being connected in series in sequence), and the excitation adjustment unit 600 is connected to the second current collection unit 400. Wherein:
and the direct current positive input end + and the direct current negative input end-are used for providing direct current for the excitation loop of the emergency diesel generator.
The field suppression switch 200 is used for providing a field current forming path for an emergency diesel generator field circuit when the emergency diesel generator field circuit is closed.
The field winding is used to cause the emergency diesel generator 100 to generate a voltage at the generator end when a field current is passed through.
The first current collecting unit 300 is used for collecting and displaying the excitation current.
The second current collecting unit 400 is configured to collect the excitation current and feed back the excitation current to the excitation adjusting unit 600.
The excitation adjusting unit 600 adjusts the direct current provided by the excitation loop of the emergency diesel generator according to the excitation current, and then adjusts the excitation current.
When the existing excitation loop current sampling of the emergency diesel generator of the million-kilowatt nuclear power station is realized, only one element is adopted for measurement and is respectively used for displaying and feeding back, and the problems that the measurement element fails and the displaying and feeding back functions cannot be realized exist. The utility model discloses an embodiment provides a million kilowatt level nuclear power station emergency diesel generator excitation circuit, realizes the display function through first current acquisition unit, and second current acquisition unit realizes the feedback function, separately measures, separately uses, has avoided the problem that present measuring element once breaks down, and display and feedback function can't be realized; meanwhile, the mutual influence and interference between a key control loop and a display loop are reduced; the reliability is improved, and the accurate collection of the exciting current is realized.
In one embodiment, the second current collecting unit 400 may employ a high-precision hall element, and the hall element is used to accurately collect the exciting current and directly collect the exciting current signal, thereby avoiding the conventional conversion process of collecting the voltage signal first and then converting the voltage signal into the current signal, and feeding back the collected exciting current to the excitation adjusting unit 600.
In one embodiment, the first current collecting unit 300 includes a current divider 310 and a current meter 320, wherein the current divider 310 is used for collecting the excitation current, and the current meter 320 is used for displaying the excitation current.
In one embodiment, the field suppression switch 200 includes a first main contact 210, a second main contact 220, and an auxiliary contact 230, and the emergency diesel generator excitation circuit further includes a field suppression resistor 700, wherein:
the first main contact 210 is connected between the direct current positive input terminal + and the first current collecting unit 300.
The second current collecting unit 400 is connected between the first current collecting unit 300 and the first end of the field winding 500.
The second main contact 220 is connected between the second end of the field winding 500 and the dc negative input terminal-.
The auxiliary contact 230 and the demagnetization resistor 700 are connected in series between the first end of the excitation winding 500 and the second end of the excitation winding 500.
The embodiment of the utility model provides an emergent diesel generator excitation circuit of million kilowatt level nuclear power station, through adjusting second current acquisition unit 400 to present position, purpose from current 1: at the existing position 1, when the emergency diesel generator 100 is in a field-extinguishing shutdown process, the field current passes through the auxiliary contact 230 of the field-extinguishing switch 200 and the field-extinguishing resistor 700 from the field winding 500, and then passes through the position 1 to form a loop. At the moment of de-excitation, excitation current still flows on the 1, which is easy to cause interference to operators. The current position is adjusted, the interference caused by the loop current formed at the moment of de-excitation can not be caused, and the state of the current loop is consistent with that of the unit.
The utility model relates to an embodiment provides an emergent diesel generator excitation circuit of million kilowatt level nuclear power station adopts the demagnetization mode of linear demagnetization resistor 700+ demagnetization switch 200, and the demagnetization mode is simple reliable. The rated interrupting voltage and rated interrupting current of the magnetic extinguishing switch 200 meet the requirements of the magnetic extinguishing arc voltage and interrupting, and meanwhile, the switch mechanism adopts a mechanical holding mode in consideration of the emergency reliability. The main demagnetization switch 200 parameters are as follows: the coil working voltage is 48V dc, the type is mechanical protection, the rated operating voltage is 500V, and the rated operating current is 1000A.
In one embodiment, the excitation regulator unit 600 includes an excitation regulator 610 and a power rectifier 620, the excitation regulator 610 is connected between the second current collecting unit 400 and the control end of the power rectifier 620, the input end of the power rectifier 620 is connected to the three-phase output end of the emergency diesel generator 100, and the output end of the power rectifier 620 is connected to the dc positive input end + and the dc negative input end-; the excitation regulator 610 is configured to regulate the power rectifier 620 according to the terminal target voltage, the voltage and current output by the emergency diesel generator 100, and the excitation current, and further regulate the direct current provided by the excitation loop of the emergency diesel generator, so as to regulate the excitation current.
In one embodiment, the rectifier bridge in the power rectifier 620 adopts a three-phase fully-controlled bridge, and considering forced excitation, the parameters of the thyristors are as follows: rated input voltage 115Vac, rated output current 500A, and maximum output current 750A/10 s.
In one embodiment, the emergency diesel generator excitation circuit further includes a third current collection unit 800 and a voltage collection unit 900, wherein:
the third current collecting unit 800 is connected between the emergency diesel generator 100 and the excitation regulator 610, and is configured to collect a current output by the emergency diesel generator 100 and output the current output by the emergency diesel generator 100 to the excitation regulator 610.
The voltage collecting unit 900 is connected between the emergency diesel generator 100 and the excitation regulator 610, and is configured to collect the voltage output by the emergency diesel generator 100 and output the voltage output by the emergency diesel generator 100 to the excitation regulator 610.
In one embodiment, the third current collecting unit 800 may specifically adopt a current transformer, and the current transformer is used for collecting and converting the current output by the emergency diesel generator 100 and outputting the current to the excitation regulator 610. The current in the lines of power generation, transformation, transmission, distribution and utilization is very different, from several amperes to several tens of thousands of amperes. For the convenience of measurement, protection and control, conversion to a more uniform current is required, and in addition, the voltage on the line is generally higher, which is very dangerous if the direct measurement is carried out. The current transformer plays the role of current transformation and electric isolation.
In one embodiment, the voltage collecting unit 900 may specifically adopt a voltage transformer, and the voltage transformer is used for collecting and converting the voltage output by the emergency diesel generator 100 and outputting the voltage to the excitation regulator 610. The basic structure of a voltage transformer is similar to that of a transformer, and the voltage transformer also has two windings, one is called a primary winding and the other is called a secondary winding. Both windings are mounted or wound on a core. Insulation is arranged between the two windings and between the windings and the iron core, so that the two windings and between the windings and the iron core are electrically isolated. When the voltage transformer operates, the primary winding N1 is connected in parallel on a circuit, and the secondary winding N2 is connected in parallel with an instrument or a relay. Therefore, when measuring the voltage on the high-voltage line, although the primary voltage is high, the secondary voltage is low, and the safety of operators and instruments can be ensured.
In one embodiment, the emergency diesel generator excitation circuit further includes a freewheeling resistor 1000, and the freewheeling resistor 1000 is connected between the dc positive input terminal + and the dc negative input terminal — and is configured to provide a freewheeling circuit for the emergency diesel generator excitation circuit to freewheel.
In one embodiment, a self-shunt excitation structure is adopted, and the emergency response time of the emergency diesel generator 100 is considered to meet the requirement of the technical specification, the emergency diesel generator excitation loop further comprises an excitation starting loop 1100, and the excitation starting loop 1100 is connected with a direct current positive input end + and a direct current negative input end-. The excitation starting loop 1100 comprises an excitation starting switch, an excitation starting current limiting resistor and a diode; one main contact of the excitation start switch, the excitation current limiting resistor and the diode are connected in series between the positive input end of 125V and the direct current positive input end +, and the other main contact of the excitation start switch is connected between the negative input end of 125V and the direct current negative input end-. When the rotating speed of the emergency diesel generator 100 reaches 800 revolutions, the excitation starting loop 1100 is put into use, the rotating speed of the emergency diesel generator 100 is increased to the rated rotating speed, and the voltage of the emergency diesel generator 100 is built to 0.8 rated terminal voltage. The excitation loop uses LBA and LBB power supply, and the main parameters of the excitation switch are as follows: power supply capacity 180A/3S, power supply voltage level 125V, minimum DC current 35A, maximum DC power supply duration 3S.
In the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An emergent diesel generator excitation circuit of million kilowatt level nuclear power station, its characterized in that includes: the excitation control circuit comprises a direct current positive input end, a direct current negative input end, a field suppression switch, a first current acquisition unit, a second current acquisition unit, an excitation winding and an excitation adjusting unit; the de-excitation switch, the first current acquisition unit, the second current acquisition unit and the excitation winding are connected in series between the direct current positive input end and the direct current negative input end, the excitation regulation unit is connected with the second current acquisition unit, wherein:
the direct-current positive input end and the direct-current negative input end are used for providing direct current for an excitation loop of the emergency diesel generator;
the de-excitation switch is used for providing excitation current for the excitation loop of the emergency diesel generator to form a passage when the de-excitation switch is closed;
the excitation winding is used for enabling the emergency diesel generator to generate generator terminal voltage when the excitation current passes through;
the first current acquisition unit is used for acquiring and displaying the excitation current;
the second current acquisition unit is used for acquiring the excitation current and feeding back the excitation current to the excitation regulation unit;
and the excitation adjusting unit adjusts the direct current provided by the excitation loop of the emergency diesel generator according to the excitation current, and then adjusts the excitation current.
2. The excitation loop of the emergency diesel generator of the megawatt-class nuclear power station as claimed in claim 1, wherein the second current collection unit comprises a hall element, and the hall element is used for collecting the excitation current and feeding back the excitation current to the excitation regulation unit.
3. The excitation circuit of an emergency diesel generator of a million kilowatt nuclear power station as claimed in claim 1, wherein said first current collection unit comprises a current divider and a current meter, said current divider is used for collecting said excitation current, and said current meter is used for displaying said excitation current.
4. The megakilowatt-class nuclear power station emergency diesel generator excitation circuit of claim 2, wherein the field-kill switch comprises a first main contact, a second main contact and an auxiliary contact, the emergency diesel generator excitation circuit further comprising a field-kill resistor, wherein:
the first main contact is connected between the direct current positive input end and the first current acquisition unit;
the second current acquisition unit is connected between the first current acquisition unit and the first end of the excitation winding;
the second main contact is connected between the second end of the excitation winding and the direct current negative input end;
the auxiliary contact and the de-excitation resistor are connected in series between the first end of the excitation winding and the second end of the excitation winding.
5. The excitation loop of an emergency diesel generator of a million kilowatt nuclear power station as claimed in claim 4, wherein said excitation regulator unit comprises an excitation regulator and a power rectifier, said excitation regulator is connected between said second current collecting unit and a control end of said power rectifier, an input end of said power rectifier is connected to a three-phase output end of said emergency diesel generator, and an output end of said power rectifier is connected to said positive direct current input end and said negative direct current input end; the excitation regulator is used for regulating the power rectifier according to a machine end target voltage, the voltage and the current output by the emergency diesel generator and the excitation current, and further regulating the direct current provided by the excitation loop of the emergency diesel generator so as to regulate the excitation current.
6. The excitation circuit of an emergency diesel generator of a million kilowatt class nuclear power station as claimed in claim 5, further comprising a third current collection unit and a voltage collection unit, wherein:
the third current collecting unit is connected between the emergency diesel generator and the excitation regulator and is used for collecting the current output by the emergency diesel generator and outputting the current output by the emergency diesel generator to the excitation regulator;
the voltage acquisition unit is connected between the emergency diesel generator and the excitation regulator and used for acquiring the voltage output by the emergency diesel generator and outputting the voltage output by the emergency diesel generator to the excitation regulator.
7. The excitation loop of the emergency diesel generator of the megawatt-class nuclear power station as claimed in claim 6, wherein the third current collecting unit comprises a current transformer, and the current transformer is used for collecting and converting the current output by the emergency diesel generator and outputting the current to the excitation regulator;
the voltage acquisition unit comprises a voltage transformer, and the voltage transformer is used for acquiring and converting the voltage output by the emergency diesel generator and then outputting the voltage to the excitation regulator.
8. The excitation circuit of an emergency diesel generator of a million kilowatt nuclear power station as claimed in claim 1, further comprising a freewheeling resistor connected between said positive dc input and negative dc input.
9. The excitation circuit of an emergency diesel generator of a million kilowatt class nuclear power station as claimed in claim 1, further comprising an excitation circuit connecting said positive direct current input terminal and said negative direct current input terminal.
10. The excitation loop of the emergency diesel generator of the million kilowatt nuclear power station as claimed in claim 9, wherein the excitation loop comprises an excitation switch, an excitation current limiting resistor and a diode; one main contact of the excitation starting switch, the excitation starting current limiting resistor and the diode are connected between the positive input end of 125V and the direct current positive input end in series, and the other main contact of the excitation starting switch is connected between the negative input end of 125V and the direct current negative input end.
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| CN201921858889.1U CN211405907U (en) | 2019-10-31 | 2019-10-31 | Excitation loop of emergency diesel generator of million-kilowatt nuclear power station |
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| CN201921858889.1U CN211405907U (en) | 2019-10-31 | 2019-10-31 | Excitation loop of emergency diesel generator of million-kilowatt nuclear power station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985775A (en) * | 2021-10-27 | 2022-01-28 | 中广核工程有限公司 | Nuclear power unit control method and system considering quick valve closing action |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985775A (en) * | 2021-10-27 | 2022-01-28 | 中广核工程有限公司 | Nuclear power unit control method and system considering quick valve closing action |
| CN113985775B (en) * | 2021-10-27 | 2024-01-02 | 中广核工程有限公司 | Nuclear power unit control method and system considering fast closing valve action |
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