CN212649388U - Excitation system current-sharing coefficient on-line monitoring and analyzing device - Google Patents
Excitation system current-sharing coefficient on-line monitoring and analyzing device Download PDFInfo
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- CN212649388U CN212649388U CN202021495870.8U CN202021495870U CN212649388U CN 212649388 U CN212649388 U CN 212649388U CN 202021495870 U CN202021495870 U CN 202021495870U CN 212649388 U CN212649388 U CN 212649388U
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Abstract
The utility model discloses an excitation system current sharing coefficient on-line monitoring and analyzing device, which comprises a host computer, wherein the host computer is respectively connected with a plurality of branch computers through Ethernet cables, and the host computer is respectively connected with an alarm unit positioned in a centralized control room and a current divider at the negative pole side of a generator rotor; the main machine is also sequentially connected with the positive pole fast fuse, the magnetic field breaker, the generator rotor winding and the negative pole fast fuse through wires to form a closed loop, and the generator rotor winding is connected with the positive pole direct current bus of the excitation system and the negative pole direct current bus of the excitation system; each extension is also connected with an extension wiring unit. The utility model discloses on-line monitoring and analytical equipment on-line monitoring excitation system is handed over, the numerical value of direct current side voltage and the numerical value of wave form and direct current side current, the current coefficient of flow equalizing in real time of calculating, the variable trend of record coefficient of flow equalizing sends alarm signal notice operation personnel for the control backstage when the coefficient of flow equalizing is less than the setting value to judge the reason that the coefficient of flow equalizing descends through each item of analysis data, analyze out the fault location.
Description
Technical Field
The utility model belongs to the technical field of the excitation system, concretely relates to excitation system coefficient of flow equalizing on-line monitoring and analytical equipment.
Background
The generator excitation system is an important component of an electric power system, and plays important roles of stabilizing the voltage of the generator, distributing the reactive power among the generators running in parallel, improving the stability of the generator and the electric power system and the like. The generator excitation system is generally composed of an excitation regulator, a power unit and a field suppression unit. The power unit is used as the heart of the excitation system and plays an important role in providing excitation current for the generator. The power unit is generally formed by connecting a plurality of rectifier cabinets in parallel (the number of the rectifier cabinets is 2-5 according to different capacities of the generator), and the exciting currents output by the rectifier cabinets which are operated in parallel are basically kept consistent, so that the service life of thyristors of the rectifier cabinets is prolonged. The 11.4.7 th important requirement on twenty-five major requirements on preventing power production accidents (national energy safety [ 2014 ] 161) also has the corresponding requirement that the current sharing coefficient of the rectifier cabinet is not lower than 0.9'.
At present, the existing excitation systems cannot intuitively reflect the numerical value of the current sharing coefficient, and technicians need to read and calculate the numerical value indicated by an ammeter arranged on each rectifier cabinet on site; the rectifier cabinets of part of the imported excitation equipment are not provided with an ammeter, the current of each rectifier cabinet cannot be monitored, and the current sharing coefficient cannot be calculated. When the current sharing coefficient of the excitation system is abnormal, technicians often can only analyze and judge the reason of the abnormal current sharing coefficient by experience because the excitation system is in an operating state, but cannot directly detect the abnormal current sharing coefficient, and certain difficulty is caused in troubleshooting and processing the abnormal current sharing coefficient.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an excitation system coefficient of flow equalization on-line monitoring and analytical equipment has solved the problem that current excitation system can't in time monitor coefficient of flow equalization numerical value.
The utility model adopts the technical scheme that the on-line monitoring and analyzing device for the current sharing coefficient of the excitation system comprises a host arranged in a de-excitation switch cabinet, wherein the host is respectively connected with a plurality of extension sets through Ethernet cables, and the host is respectively connected with an alarm unit positioned in a centralized control room and a current divider at the negative pole side of a generator rotor;
the main machine is also sequentially connected with the positive pole fast fuse, the magnetic field breaker, the generator rotor winding and the negative pole fast fuse through wires to form a closed loop, and the generator rotor winding is connected with the positive pole direct current bus of the excitation system and the negative pole direct current bus of the excitation system;
each extension is also connected with an extension wiring unit.
The utility model is characterized in that:
the branch wiring unit comprises an excitation variable primary winding unit and an excitation variable secondary winding unit, the excitation variable secondary winding unit is connected with a rectifier cabinet alternating-current side three-phase isolation disconnecting link, a rectifier bridge unit and a rectifier cabinet direct-current side two-phase isolation disconnecting link through conducting wires, and the rectifier cabinet direct-current side two-phase isolation disconnecting link is connected with an excitation system positive direct-current bus and an excitation system negative direct-current bus.
The excitation variable primary side winding unit comprises an excitation variable primary side A phase winding, an excitation variable primary side B phase winding and an excitation variable primary side C phase winding;
the excitation variable secondary winding unit comprises an excitation variable secondary side A phase winding, an excitation variable secondary side B phase winding and an excitation variable secondary side C phase winding.
The rectifier bridge unit comprises three rectifier bridges, each rectifier bridge is connected with an extension, and a rectifier cabinet shunt is further connected to the extension.
The rectifier bridge comprises a rectifier bridge fast fuse and a rectifier bridge thyristor which are connected in sequence.
The alarm unit is specifically a buzzer.
The utility model has the advantages that: the utility model relates to an excitation system coefficient of flow equalizing on-line monitoring and analytical equipment, can the on-line monitoring excitation system hand over when the generator operation, the numerical value of direct current side voltage and the numerical value of wave form and direct current side current, the coefficient of flow equalizing at present of real-time computation, the variable trend of record coefficient of flow equalizing sends alarm signal notice operation personnel for the control backstage when the coefficient of flow equalizing is less than the setting value, and judge the reason that the coefficient of flow equalizing descends through analysis each item data, the analysis fault location, there is fine practical value.
Drawings
Fig. 1 is a schematic structural diagram of an excitation system current sharing coefficient on-line monitoring and analyzing device of the present invention;
fig. 2 is a schematic structural diagram of an extension wiring unit in the excitation system current sharing coefficient on-line monitoring and analyzing device of the present invention;
fig. 3 is a flow chart of the utility model for an excitation system current sharing coefficient on-line monitoring and analyzing device.
In the figure, 1, a main machine, 2, a branch machine, 3, a rectifier cabinet alternating current side three-phase isolation disconnecting link, 4, a rectifier cabinet direct current side two-phase isolation disconnecting link, 5, a positive pole fast fuse, 6, a negative pole fast fuse, 7, a magnetic field breaker, 8, a generator rotor negative pole side current divider, 9, a generator rotor winding, 10, an excitation system positive pole direct current bus, 11, an excitation system negative pole direct current bus, 12, an alarm unit, 13, an excitation transformer primary side A phase winding, 14, an excitation transformer primary side B phase winding, 15, an excitation transformer primary side C phase winding, 16, an excitation transformer secondary side A phase winding, 17, an excitation transformer secondary side B phase winding, 18, an excitation transformer secondary side C phase winding, 19, a rectifier cabinet current divider, 20, a rectifier bridge fast fuse, 21, an Ethernet rectifier bridge thyristor and 22 are network wires.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to an excitation system current sharing coefficient on-line monitoring and analysis device, as shown in figure 1, comprising a host 1 arranged in a de-excitation switch cabinet, wherein the host 1 is respectively connected with a plurality of extension sets 2 through Ethernet cables 22, and the host 1 is respectively connected with an alarm unit 12 positioned in a centralized control room and a generator rotor cathode side shunt 8; the main machine 1 is also sequentially connected with a positive electrode fast fuse 5, a magnetic field breaker 7, a generator rotor winding 9 and a negative electrode fast fuse 6 through leads to form a closed loop, and the generator rotor winding 9 is connected with an excitation system positive electrode direct current bus 10 and an excitation system negative electrode direct current bus 11; an extension wiring unit is also connected to each extension 2.
The main machine 1 is installed on the direct current outlet side of the generator excitation system, and generally in a field suppression switch cabinet, has the following functions: firstly, measuring the voltage of a generator rotor, and in order to prevent human body and equipment damage caused by short circuit of a measuring loop, serially connecting a positive electrode fast fuse 5 and a negative electrode fast fuse 6 into the rotor voltage measuring loop; secondly, measuring the current of the generator rotor through a current divider 8 at the negative pole side of the generator rotor; secondly, receiving the exciting current output by each rectifier cabinet collected by the extension 2, calculating a current sharing coefficient, and sending an alarm signal to the alarm unit 12 when the current sharing coefficient of the exciting system is lower than a set current sharing coefficient value; and finally, receiving the excitation variable secondary side A, B, C three-phase voltage and gate trigger pulses of the thyristors of each rectifier bridge collected by the extension 2, and analyzing and judging the reason for reducing the current sharing coefficient of the excitation system by analyzing the voltage waveform of the excitation variable secondary side and the gate trigger pulses of the thyristors 21 of each rectifier bridge.
As shown in fig. 2, the extension wiring unit includes an excitation variable primary winding unit and an excitation variable secondary winding unit, the excitation variable secondary winding unit is connected to a three-phase isolation disconnecting link 3 on the ac side of the rectifier cabinet, a rectifier bridge unit and a two-phase isolation disconnecting link 4 on the dc side of the rectifier cabinet through a wire, and the two-phase isolation disconnecting link 4 on the dc side of the rectifier cabinet is connected to an excitation system positive dc bus 10 and an excitation system negative dc bus 11.
The excitation variable primary side winding unit comprises an excitation variable primary side A phase winding 13, an excitation variable primary side B phase winding 14 and an excitation variable primary side C phase winding 15; the excitation variable secondary winding unit comprises an excitation variable secondary A-phase winding 16, an excitation variable secondary B-phase winding 17 and an excitation variable secondary C-phase winding 18.
The rectifier bridge unit comprises three rectifier bridges, each rectifier bridge is connected with the extension 2, and the extension 2 is further connected with a rectifier cabinet shunt 19.
The rectifier bridge comprises a rectifier bridge fast fuse 20 and a rectifier bridge thyristor 21 which are connected in sequence.
The alarm unit 12 is specifically a buzzer.
The extension set 2 is installed in each rectifier cabinet of the excitation system, measures the voltage waveforms of the excitation transformer secondary side A phase winding 13, the excitation transformer secondary side B phase winding 14 and the excitation transformer secondary side C phase winding 15, and the gate trigger pulse of the rectifier bridge thyristor 21, measures the excitation current output by the rectifier cabinet through the rectifier cabinet shunt 19, and sends the measurement results to the host 1 through the Ethernet cable 22 for the host 1 to perform calculation and analysis.
The utility model relates to an excitation system coefficient of flow equalization on-line monitoring and analytical equipment's working process as follows, as shown in FIG. 3:
firstly, the current sharing coefficient of the excitation system is calculated.
If a generator excitation system is provided with m rectifier cabinets corresponding to m extension sets 2, excitation current I output by the m rectifier cabinets is transmitted through an Ethernet cable 22f1、If2…IfmSending to the host 1, calculating the current sharing coefficient K of the excitation system by the host 1 according to the formula (1):
in the formula (1), parameters
For sum of m parallel-connected rectifier cabinets current, parameters
The maximum current value in the m parallel rectifier cabinets is obtained.
And secondly, comparing the current sharing coefficients.
When the current sharing coefficient K of the excitation system is larger than or equal to a set value or the current sharing coefficient variation delta K is smaller than a variation set value, sending a current sharing coefficient normal signal to a monitoring background; and when the current sharing coefficient K of the excitation system is less than a set value or the current sharing coefficient variation delta K is more than or equal to a variation set value, judging the reason of current sharing coefficient abnormality.
And finally, the main machine 1 judges whether the trigger pulse is normal or not according to the gate trigger pulse of each rectifier cabinet thyristor 21 and the three-phase voltage of the secondary side of the excitation transformer, which are sent by each extension 2. If the current sharing coefficient is normal, judging that the reason of the current sharing coefficient reduction is abnormal of a through-flow loop of the rectifying device, if the current sharing coefficient reduction is abnormal, judging that the reason of the current sharing coefficient reduction is abnormal of a control function of the rectifying device, sending the two judgment results to a monitoring background, and notifying an operation monitoring person. The method specifically comprises the following steps:
and if the current sharing coefficient is reduced, carrying out reason analysis. The reduction of the current sharing coefficient of the excitation system is generally caused by two reasons of abnormal control function of the rectifying device and abnormal through-flow loop of the rectifying device. Specifically, the method comprises the following steps:
(1) the rectifier control function abnormality is represented by the abnormality of the gate trigger pulse of the rectifier bridge thyristor 21. When a thyristor gate-level trigger device (pulse trigger plate) of a certain rectifier cabinet fails, the thyristors 21 of the rectifier bridge cannot be correctly triggered to be conducted, so that the exciting current output by the rectifier cabinet is reduced, and the current sharing coefficient is reduced.
As shown in fig. 2, the extension set 2 transmits the excitation variable secondary side three-phase voltage and the rectifier bridge thyristor 21 gate-level trigger pulse of the rectifier cabinet to the host 1 through the ethernet cable 22, the host 1 calculates the thyristor conduction angle of each rectifier cabinet according to the excitation variable secondary side three-phase voltage waveform and the rectifier cabinet thyristor 21 gate-level trigger pulse, and by comparing the thyristor conduction angle and the trigger pulse of each rectifier cabinet, it can be determined whether the thyristor gate-level trigger device (pulse trigger plate) of each rectifier cabinet works normally.
(2) The rectifying device through-flow circuit is abnormal mainly due to the following reasons, as shown in fig. 2:
1) when the three-phase isolation disconnecting link 3 at the alternating current side of the rectifier cabinet or the two-phase isolation disconnecting link 4 at the direct current side of the rectifier cabinet are in poor contact, the impedance of a parallel branch formed by each rectifier cabinet is changed, the exciting current output by each rectifier cabinet is changed, and the current sharing coefficient is reduced;
2) the output current of the rectifier cabinet is reduced due to the fact that the rectifier bridge fast fuse 20 is blown or the rectifier bridge thyristor 21 fails, and the current sharing coefficient is reduced.
When the host 1 detects that the current sharing coefficient is reduced and the function of the rectifying device is not abnormal under the condition (1), the current sharing coefficient is judged to be abnormal.
Claims (6)
1. An excitation system current sharing coefficient on-line monitoring and analyzing device is characterized by comprising a host (1) arranged in a de-excitation switch cabinet, wherein the host (1) is respectively connected with a plurality of sub-machines (2) through Ethernet cables (22), and the host (1) is respectively connected with an alarm unit (12) positioned in a centralized control room and a generator rotor cathode side current divider (8);
the main machine (1) is also sequentially connected with a positive electrode fast fuse (5), a magnetic field breaker (7), a generator rotor winding (9) and a negative electrode fast fuse (6) through leads to form a closed loop, and the generator rotor winding (9) is connected with an excitation system positive electrode direct current bus (10) and an excitation system negative electrode direct current bus (11);
each extension (2) is also connected with an extension wiring unit.
2. The excitation system current sharing coefficient on-line monitoring and analyzing device as claimed in claim 1, wherein the extension wiring unit comprises an excitation transformer primary winding unit and an excitation transformer secondary winding unit, the excitation transformer secondary winding unit is connected with a rectifier cabinet alternating-current side three-phase isolation disconnecting link (3), a rectifier bridge unit and a rectifier cabinet direct-current side two-phase isolation disconnecting link (4) through a lead, and the rectifier cabinet direct-current side two-phase isolation disconnecting link (4) is connected with an excitation system positive direct-current bus (10) and an excitation system negative direct-current bus (11).
3. The excitation system current sharing coefficient on-line monitoring and analyzing device as claimed in claim 2, wherein the excitation variable primary winding unit comprises an excitation variable primary side A phase winding (13), an excitation variable primary side B phase winding (14), and an excitation variable primary side C phase winding (15);
the excitation variable secondary side winding unit comprises an excitation variable secondary side A-phase winding (16), an excitation variable secondary side B-phase winding (17) and an excitation variable secondary side C-phase winding (18).
4. The excitation system current sharing coefficient on-line monitoring and analyzing device as claimed in claim 2, wherein the rectifier bridge unit comprises three rectifier bridges, each rectifier bridge is connected to the extension set (2), and a rectifier cabinet shunt (19) is further connected to the extension set (2).
5. The excitation system current sharing coefficient on-line monitoring and analyzing device of claim 4, wherein the rectifier bridge comprises a rectifier bridge fast fuse (20) and a rectifier bridge thyristor (21) which are connected in sequence.
6. The excitation system current sharing coefficient online monitoring and analyzing device according to claim 1, wherein the alarm unit (12) is a buzzer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021495870.8U CN212649388U (en) | 2020-07-23 | 2020-07-23 | Excitation system current-sharing coefficient on-line monitoring and analyzing device |
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| CN202021495870.8U CN212649388U (en) | 2020-07-23 | 2020-07-23 | Excitation system current-sharing coefficient on-line monitoring and analyzing device |
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| CN212649388U true CN212649388U (en) | 2021-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112187122A (en) * | 2020-07-23 | 2021-01-05 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Monitoring and analyzing device and method for current-sharing coefficient of excitation rectifier cabinet |
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- 2020-07-23 CN CN202021495870.8U patent/CN212649388U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112187122A (en) * | 2020-07-23 | 2021-01-05 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Monitoring and analyzing device and method for current-sharing coefficient of excitation rectifier cabinet |
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