CN210038138U - Main transformer sampling synchronism verifying device of intelligent substation - Google Patents
Main transformer sampling synchronism verifying device of intelligent substation Download PDFInfo
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- CN210038138U CN210038138U CN201920079681.3U CN201920079681U CN210038138U CN 210038138 U CN210038138 U CN 210038138U CN 201920079681 U CN201920079681 U CN 201920079681U CN 210038138 U CN210038138 U CN 210038138U
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Abstract
The utility model discloses an intelligent substation owner becomes sampling synchronism calibration equipment, including the electric power outfit that converts single-phase commercial power into three-phase electricity and trades device, transformer, a plurality of voltage transformer, a plurality of current transformer, main protection device, high-pressure side merging unit and low pressure side merging unit, electric power conversion device's input be connected with mains supply, electric power conversion device's output be connected with each looks circuit electricity of high-pressure side of transformer, high-pressure side merging unit is connected with each looks circuit electricity of transformer high-pressure side through a plurality of current transformer and a plurality of voltage transformer, low pressure side merging unit is connected through each looks circuit electricity of a plurality of current transformer and a plurality of voltage transformer and transformer low pressure side. The utility model discloses the device can wide application in intelligent electric substation technical transformation and maintenance engineering, can improve on-the-spot work efficiency and check-up precision greatly, optimizes intelligent substation owner and becomes protection sampling synchronism check-up method.
Description
Technical Field
The utility model belongs to smart power grids fault detection field especially, relates to a smart substation owner becomes sampling synchronism check-up device.
Background
For a conventional transformer substation, analog quantity sampling of a relay protection device is to introduce secondary quantities of a voltage transformer and a current transformer through a secondary cable, and an A/D conversion unit of the device completes conversion from the analog quantity to a digital quantity. The mode outputs continuous analog quantity, the sampling transmission time delay is small, and data at different intervals have natural synchronism through centralized sampling of the protection device.
The first situation is as follows: sampling delay test method; in the intelligent substation, analog quantity sampling is completed by a merging unit installed in a local control cubicle and is sent to a relay protection device through optical fibers, and as shown in figure 1, the distributed sampling causes that the sampling data at intervals lose natural synchronism; therefore, the synchronization of the cross-interval data is realized by the protection device through a resampling mode according to the data delay of the merging unit; because the delay of each merging unit to data conversion is different, the delay needs to be accurately measured, and delay parameters are set according to the measurement result, otherwise, delay measurement errors and parameter setting errors cause phase errors between voltage and current quantities to be increased. In addition, the conventional circuit line-checking is disabled because the protection circuit is changed from a wire connection to a virtual terminal configuration. At present, field engineering personnel can test the inherent delay of the merging unit through the merging unit tester, and check whether the sampling delay fixed value of the device is correct or not according to the test result. The merging units transmit data to the protection device through optical fibers, and the transmission delay can be ignored compared with the inherent delay of the merging unit device, so that the synchronism of each interval merging unit can be ensured as long as the fixed value of the transmission delay of each merging unit is ensured to be set correctly; the method is simple, but only can ignore transmission delay by default, and meanwhile, the test method does not meet the test requirement of the whole relay protection group.
The second situation: the cable direct connection testing method is a traditional test for protecting the whole set of tests, and is a traditional test method for protecting the whole set of tests, and is characterized in that a voltage and current channel of a relay protection tester is directly led to a protection device by a wire to be subjected to a protection test; in the intelligent substation, the voltage and the current of the protection device come from respective merging units, and during testing, a relay protection tester must be placed on a certain current merging unit, and the voltage and the current of the relay protection tester are added to other merging units by using wires; taking bus differential protection as an example, the structural schematic is shown in fig. 2, and the relay protection tester is connected with the bus, the line, each merging unit of the main transformer and the intelligent terminal through wires. The cable direct connection testing method is simple in principle and easy to master. However, since the merging units are dispersedly arranged on the primary equipment site, the spatial distance between the merging units is relatively long, particularly, the spacing distance between three sides of the main transformer and the bus can reach hundreds of meters, and 4-12 test lines are needed. Considering that the test lead is generally limited in length, the method is adopted to carry out the test, a one-hundred-meter secondary cable is generally needed, and the field use is very inconvenient; meanwhile, the impedance of the secondary long cable is large, the output capacity of the relay protection tester is limited, and large current cannot be input. Therefore, the method is only suitable for the whole group of tests of the protection devices with relatively short space distances in the substation, and is not suitable for the synchronous whole group of tests of the substation with relatively large scale.
The current situation three: synchronously triggering the whole set of test methods by the GPS; the problems of complex wiring and insufficient input capacity caused by long cables are solved, an in-station protection whole group test can be carried out by adopting a GPS synchronous triggering mode of 2 or more protection testers, and as shown in figure 3, the GPS synchronous triggering whole group test method comprises the following specific steps: (1) connecting a GPS receiver (including an antenna) configured on the relay protection tester to the tester; (2) determining that the satellite signals received by the GPS receiver are normal; (3) setting a triggering mode of a state sequence test program of the relay protection tester as GPS synchronous triggering; (4) setting a trigger time of a synchronous test on a GPS receiving device; (5) starting a synchronous test at a set synchronous test time; the GPS synchronous triggering test method requires that the relay protection tester has a GPS receiving function and has high synchronous triggering precision. In fact, different relay protection testers and GPS receiving antennas have self errors due to differences of chip models and algorithms, and particularly, testers of different manufacturers have large relative deviation; in addition, the merging units may be distributed indoors, the GPS receiving device may receive unstable signals, and a long GPS receiving antenna needs to be led outdoors, so that the wiring is complicated, and the adaptability is not strong.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the synchronous whole group test requirement of transformer substation relay protection, the utility model provides an intelligent substation owner becomes sampling synchronism calibration equipment, through the device and the method, use the short-circuit impedance of transformer as the load, through providing a power at the high-pressure side, realize once load trend, through the current transformer transform, through secondary circuit to merging unit device, thereby accomplish relevant synchronism test, can wide application in intelligent substation technical transformation and maintenance engineering, on-the-spot work efficiency and check-up precision can be improved greatly, optimize intelligent substation owner and become protection sampling synchronism calibration equipment.
A main transformer sampling synchronism checking device of an intelligent substation comprises a power conversion device for converting single-phase commercial power into three-phase power, a transformer, a voltage transformer, a current transformer, a main transformer protection device, a high-voltage side merging unit and a low-voltage side merging unit, the power conversion device comprises a rectification circuit, a filter circuit, an inverter circuit, an energy storage unit and a voltage regulating circuit, the input end of the rectification circuit is electrically connected with a single-phase commercial power supply, the output end of the rectification circuit is electrically connected with the input end of the inverter circuit, the output end of the inverter circuit is electrically connected with the input end of the energy storage unit, the output end of the energy storage unit is electrically connected with the input end of the voltage regulating circuit, the output end of the voltage regulating circuit is electrically connected with each phase circuit at the high-voltage side of the transformer, and the filter circuit is connected in parallel at two ends of the output end of the rectifying circuit; the high-voltage side merging unit is electrically connected with each phase circuit on the high-voltage side of the transformer through a current transformer and a voltage transformer, and the low-voltage side merging unit is electrically connected with each phase circuit on the low-voltage side of the transformer through the current transformer and the voltage transformer. According to the scheme, single-phase 220V alternating current is converted into three-phase 380V sine alternating current through rectification-filtering-inversion and is stored in the energy storage unit, three-phase power is converted into 0-600V three-phase adjustable sine alternating current through the voltage regulating circuit after the energy storage unit is stably released, the three-phase alternating current is added to a three-phase lead on the CT line side of the 110kV line, meanwhile, the short circuit of a three-phase copper plate on the CT bus side of the low-voltage side of a main transformer is simulated, the short circuit impedance of the main transformer is utilized to generate once through current, and the differential current of the main.
The rectifier circuit is a full-bridge rectifier circuit consisting of transistors D1, D2, D3 and D4.
The filter circuit is formed by connecting a capacitor C1 and a capacitor C2 in parallel.
The inverter circuit comprises six groups of control units, wherein the six groups of control units are formed by connecting insulated gate bipolar transistors and crystal diodes in parallel.
The voltage regulating circuit comprises 6/3 groups of anti-parallel thyristors.
And the control end of the insulated gate bipolar transistor and the control end of the thyristor are electrically connected with corresponding control pins of the control chip.
The output of the inverter circuit is three-phase 380V sine alternating current.
The utility model has the advantages that: 1. the power conversion device outputs three-phase voltage, and the amplitude of the voltage can be adjusted according to the requirements of users; 2. the device is moderate in volume and weight, small in occupied space and convenient for test personnel to carry and move according to test requirements; 3. the device operation should be convenient succinct, and the experimenter of being convenient for is familiar with equipment operation function fast.
Drawings
Fig. 1 is a schematic structural diagram of a sampling delay test method in the prior art.
Fig. 2 is a schematic structural diagram of a cable direct connection testing method in the prior art.
Fig. 3 is a schematic structural diagram of a prior art GPS synchronous triggering whole set test method.
Fig. 4 is the utility model relates to an intelligent substation owner becomes sampling synchronism verifying attachment's structural schematic diagram.
Fig. 5 is a circuit diagram of the power conversion device of the present invention.
The notation in the figure is: the power supply comprises a power supply 1, a power conversion device 2, a transformer 3, a voltage mutual inductor 4, a current transformer 5, a low-voltage side merging unit 6, a high-voltage side merging unit 7, a main transformer protection device 8, a rectifying circuit 21, a filter circuit 22, an inverter circuit 23, an energy storage unit 24 and a voltage regulating circuit 25.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is described in detail with reference to the accompanying drawings and examples, it should be understood that the specific embodiment described herein is only a preferred embodiment of the present invention, and is only used for explaining the present invention, and does not limit the protection scope of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.
Example (b): as shown in fig. 4, a main transformer sampling synchronism verification device of an intelligent substation comprises a power conversion device 2, a transformer 3, a voltage transformer 4, a current transformer 5, a main transformer protection device 8, a high-voltage side merging unit 7 and a low-voltage side merging unit 6, wherein a single-phase mains supply is converted into three-phase power, the input end of the power conversion device 2 is connected with a mains supply 1, the output end of the power conversion device 2 is electrically connected with each phase circuit on the high-voltage side of the transformer 3, the high-voltage side merging unit 7 is electrically connected with each phase circuit on the high-voltage side of the transformer 3 through the current transformer 5 and the voltage transformer 4, and the low-voltage side merging unit 6 is electrically connected with each phase circuit on the low-voltage side of the transformer 3 through the current transformer 5 and. In this embodiment, the 220V power supply is converted into three-phase adjustable sinusoidal ac power by the power conversion device 2, the three-phase ac power is applied to the three-phase lead wire on the CT line side of the 110kV line, and the short circuit of the three-phase copper plate on the CT bus side on the low-voltage side of the main transformer is simulated, so that a primary through current is generated by using the short-circuit impedance of the main transformer, and the differential current of the main transformer should be 0.
As shown in fig. 5, the power conversion device 2 includes a rectification circuit 21, a filter circuit 22, an inverter circuit 23, an energy storage unit 24 and a voltage regulation circuit 25, the input end of the rectification circuit 21 is electrically connected to the single-phase mains supply 1, the output end of the rectification circuit 21 is electrically connected to the input end of the inverter circuit 23, the output end of the inverter circuit 23 is electrically connected to the input end of the energy storage unit 24, the output end of the energy storage unit 24 is electrically connected to the input end of the voltage regulation circuit 25, the output end of the voltage regulation circuit 25 is electrically connected to each phase circuit on the high-voltage side of the transformer 3, and the filter circuit 22 is connected in parallel to both ends of the. In this embodiment, single-phase commercial power is converted into three-phase 380V alternating current through access rectifier circuit 21, then obtains stable alternating current through filtering and is stored in battery unit for a short time, and battery unit output stable three-phase alternating current is adjusted voltage amplitude through regulator circuit 25 and is controlled and change in 0~ 600V.
The rectifying circuit 21 is a full-bridge rectifying circuit 21 composed of transistors D1, D2, D3 and D4.
The filter circuit 22 is formed by connecting a capacitor C1 and a capacitor C2 in parallel.
The inverter circuit 23 comprises six groups of control units, and the six groups of control units are formed by connecting insulated gate bipolar transistors and crystal diodes in parallel.
The voltage regulating circuit 25 comprises 6/3 groups of anti-parallel thyristors.
The control end of the insulated gate bipolar transistor and the control end of the thyristor are electrically connected with corresponding control pins of a control chip (not shown). In this embodiment, the control chip controls turn-off of the insulated gate bipolar transistor and the thyristor, and inversion and voltage regulation of the whole circuit are realized.
The inverter circuit 23 outputs three-phase 380V sine alternating current.
A testing method applied to a main transformer sampling synchronism verification device of an intelligent substation comprises the following five steps:
step 1: 380V three-phase sinusoidal alternating current is generated by an inverter circuit 23 in the power conversion device 2 by using 220V commercial power in the station;
step 2: the three-phase sine alternating current is regulated between 0 and 600V through a voltage regulator;
and step 3: simulating a three-phase short circuit at the 10kV side of a main transformer, and taking 110kV main transformer short circuit impedance as a load;
and 4, step 4: generating primary load flow, and converting the load flow through a voltage transformer 4 and a current transformer 5;
and 5: and the sampled data are sent to a main transformer protection device 8 through the merging units, so that the synchronism of the merging units on the two sides is checked.
The utility model discloses a go up the embodiment do the utility model discloses, a smart substation owner becomes preferred embodiment of sampling synchronism check-up device, is not injecing with this the utility model discloses a concrete implementation scope, the utility model discloses a scope includes and is not limited to this concrete embodiment, and the all equivalent changes that do according to the utility model discloses a shape, structure are all in the protection scope.
Claims (7)
1. The utility model provides an intelligent substation owner becomes sampling synchronism verifying attachment which characterized in that: comprises a power conversion device (2) for converting single-phase mains supply into three-phase power, a transformer (3), a voltage transformer (4), a current transformer (5), a main transformer protection device (8), a high-voltage side merging unit (7) and a low-voltage side merging unit (6), wherein the power conversion device (2) comprises a rectifying circuit (21), a filter circuit (22), an inverter circuit (23), an energy storage unit (24) and a voltage regulating circuit (25), the input end of the rectifying circuit (21) is electrically connected with a single-phase mains supply (1), the output end of the rectifying circuit (21) is electrically connected with the input end of the inverter circuit (23), the output end of the inverter circuit (23) is electrically connected with the input end of the energy storage unit (24), the output end of the energy storage unit (24) is electrically connected with the input end of the voltage regulating circuit (25), the output end of the voltage regulating circuit (25) is electrically connected with each phase circuit at the high-voltage side, the filter circuit (22) is connected in parallel at two ends of the output end of the rectifying circuit (21), the high-voltage side merging unit (7) is electrically connected with each phase circuit at the high-voltage side of the transformer (3) through the current transformer (5) and the voltage transformer (4), and the low-voltage side merging unit (6) is electrically connected with each phase circuit at the low-voltage side of the transformer (3) through the current transformer (5) and the voltage transformer (4).
2. The intelligent substation main transformer sampling synchronism verification device according to claim 1, characterized in that: the rectifying circuit (21) is a full-bridge rectifying circuit (21) composed of transistors D1, D2, D3 and D4.
3. The intelligent substation main transformer sampling synchronism verification device according to claim 1, characterized in that: the filter circuit (22) is formed by connecting a capacitor C1 and a capacitor C2 in parallel to form the filter circuit (22).
4. The intelligent substation main transformer sampling synchronism verification device according to claim 1, characterized in that: the inverter circuit (23) comprises six groups of control units, and the six groups of control units are formed by connecting insulated gate bipolar transistors and crystal diodes in parallel.
5. The intelligent substation main transformer sampling synchronism verification device according to claim 1, characterized in that: the voltage regulating circuit (25) comprises 6/3 groups of anti-parallel thyristors.
6. The intelligent substation main transformer sampling synchronism verification device according to claim 4, characterized in that: and the control end of the insulated gate bipolar transistor and the control end of the thyristor are electrically connected with corresponding control pins of the control chip.
7. The intelligent substation main transformer sampling synchronism verification device according to claim 1, characterized in that: the inverter circuit (23) outputs three-phase 380V sine alternating current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920079681.3U CN210038138U (en) | 2019-01-17 | 2019-01-17 | Main transformer sampling synchronism verifying device of intelligent substation |
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| CN201920079681.3U CN210038138U (en) | 2019-01-17 | 2019-01-17 | Main transformer sampling synchronism verifying device of intelligent substation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884568A (en) * | 2019-01-17 | 2019-06-14 | 国网浙江省电力有限公司金华供电公司 | A kind of intelligent substation main transformer sample-synchronous calibration equipment and test method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884568A (en) * | 2019-01-17 | 2019-06-14 | 国网浙江省电力有限公司金华供电公司 | A kind of intelligent substation main transformer sample-synchronous calibration equipment and test method |
| CN109884568B (en) * | 2019-01-17 | 2021-09-07 | 国网浙江省电力有限公司金华供电公司 | Main transformer sampling synchronism verification device and testing method for intelligent substation |
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