CN203287466U - PT secondary false-parallel-connection detection apparatus - Google Patents
PT secondary false-parallel-connection detection apparatus Download PDFInfo
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- CN203287466U CN203287466U CN2013203083670U CN201320308367U CN203287466U CN 203287466 U CN203287466 U CN 203287466U CN 2013203083670 U CN2013203083670 U CN 2013203083670U CN 201320308367 U CN201320308367 U CN 201320308367U CN 203287466 U CN203287466 U CN 203287466U
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Abstract
The utility model relates to the technical field of electric-power system relay protection, in particular to a PT secondary false-parallel-connection detection apparatus, belongs to the technical field of electric-power system relay protection, is about a secondary loop problem of a voltage transformer and mainly solves a secondary-loop false-parallel-connection problem of the electric-power system voltage transformer. The PT secondary false-parallel-connection detection apparatus comprises that an analog-digital conversion unit is connected with a detected analog quantity unit, an output terminal of the analog-digital conversion unit is connected with an input terminal of a CPU microprocessor; and an output terminal of the CPU microprocessor is respectively connected with an automation monitoring system, a display and a loudspeaker. According to the detection apparatus provided by the utility model, safe and stable operation of primary and secondary devices of an electric power system is effectively guaranteed, and the detection apparatus can adapt to intelligent electrical network requirements and plays certain effects on safe and stable operation guarantee of the electric power system.
Description
Technical field
The utility model relates to a kind of Relay Protection Technology in Power System field, relates in particular to a kind of PT secondary mistake pick-up unit arranged side by side, belongs to the Relay Protection Technology in Power System field.Being about the Secondary Circuit of Potential Transformer problem, is mainly to solve power system voltage transformer secondary circuit mistake problem arranged side by side.
Background technology
A basic general knowledge of relay protection of power system is at present: if the bus connection switch between two sections buses of an electric substation, one mother and two mothers is in the state of disconnection, a voltage transformer (VT) that is connected on so on a bus does not allow to carry out side by side with the secondary output terminals that is connected on No. two voltage transformer (VT) on two buses.Only have when the bus connection switch between two sections buses is in closing position, just allow the voltage transformer (VT) of two same models is carried out at secondary side side by side.Although allow side by side, might not want side by side, when only a voltage transformer (VT) in two sections buses has problem out of service or while maintenance, just formerly after primary side arranged side by side under the principle of secondary side arranged side by side, carry out the parallel operation of first and second side.
If violated the first once rear principle of secondary side by side arranged side by side; in the situation that primary side is in apportion; mistake has occurred side by side in secondary; when ground connection or phase-to phase fault occur in the system at certain section bus place; make the measuring voltage of voltage transformer secondary can not truly reflect the situation of primary voltage, gently make protection tripping, Voltage Transformer Damages.Heavy cause the voltage transformer (VT) insulation damages and bus-bar fault occurs when damaging voltage transformer (VT), cause large-area power-cuts.
Analyze from technological layer: cause that mistake reason arranged side by side has a lot: 1, the fault of voltage transformer secondary automatic Synchronization device and mistake in using reason; 2, two sections busbar voltage automatic switching loop malfunction reasons that have disconnector automatically to control; 3, operation maintenance personnel maloperation reason etc.
The accident that causes side by side because of voltage transformer secondary mistake and abnormal all occurred in Shenyang Power Supply Co. and all power supply departments of the whole nation, worked out a kind of device that can automatically quote mistake and column information extremely urgent, also with the development of intelligent grid, adapted.
The utility model content
For solving the technical matters of above-mentioned existence, the utility model provides a kind of PT secondary mistake pick-up unit arranged side by side, purpose is when two sections bus splittings of electric system, automatically send voltage transformer secondary mistake sound and light signal arranged side by side according to testing result, prompting operation, dispatcher in time process.
PT secondary mistake pick-up unit arranged side by side, be to be connected with detected analog quantity by analog to digital conversion, and analog-to-digital output terminal is connected with the input end of CPU microprocessor, and the output terminal of CPU microprocessor is connected with loudspeaker with display with Automatic monitoring systems respectively.
Described detected analog quantity is secondary coil of voltage transformer.
Described microprocessor is the ARM-LPC4357 chip.
Described analog to digital conversion has two group of four phase voltage and detects and compare; Described detected analog quantity is the A of two groups of secondary coil of voltage transformers, B, C, L terminal; Wherein analog to digital converter is connected to the A of two groups of secondary coil of voltage transformers, B, and C, on the L terminal.
Described two groups of secondary coil of voltage transformers wherein one group wherein one be equipped with a characteristic frequency voltage source U0 on mutually.
Described voltage source U0 is the signal source of a non-work frequency.
The frequency of described characteristic frequency voltage source U0 is non-power-frequency voltage, and U0 is DC voltage.
Advantage of the present utility model and beneficial effect are:
The utility model is when two sections bus splittings of electric system the time, to should not detecting by secondary coil of voltage transformer arranged side by side, automatically send voltage transformer secondary mistake sound and light signal arranged side by side according to testing result, information is passed to the automatic dispatching system, and prompting operation, dispatcher in time process.Safety, the stable operation of electric system one secondary device have effectively been guaranteed.The utility model device can become a device that adapts to the intelligent grid requirement, can play a role for guaranteeing the power system safety and stability operation.
The utility model is described in further detail below in conjunction with the drawings and specific embodiments, but protection domain of the present utility model is not limit by embodiment.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is structural representation of the present utility model;
Fig. 3 is the schematic diagram of embodiment again of the present utility model.
In figure: detected analog quantity 1, analog to digital converter 2, display 3, loudspeaker 4, CPU microprocessor 5, Automatic monitoring systems 6, U0 voltage adds part 7, U0 voltage measurement part 8.
Embodiment
Embodiment 1:
Originally as depicted in figs. 1 and 2, the utility model provides a kind of PT secondary mistake pick-up unit arranged side by side, and concrete structure is as follows:
The analog to digital converter 2 that has two group of four phase voltage detection and compare is connected to the A of two groups of secondary coil of voltage transformers, B, C, gather size and the phase place of two groups of voltages on the L terminal, then with the form of digital quantity, sample information is exported to CPU microprocessor 5,5 pairs of two groups of data analysis of CPU microprocessor are processed, and then driving display 3 and loudspeaker 4 send sound and light signal, whether mistake conclusion arranged side by side will occur simultaneously send Automatic monitoring systems 6 to.
This device is applicable to two groups of voltage transformer (VT) once not side by side, and primary voltage has relatively large deviation, or two groups of voltage transformer (VT) have larger property difference and make two groups of voltages on the voltage transformer secondary terminal that the situation of larger difference be arranged.
During concrete enforcement, analog to digital conversion 2 described in the utility model is connected with detected analog quantity 1, the output terminal of analog to digital conversion 2 is connected with the input end of CPU microprocessor 5, and the output terminal of CPU microprocessor 5 is connected with loudspeaker 4 with display 3 with automated system 6 respectively.Described detected analog quantity 1 is secondary coil of voltage transformer.Described microprocessor 5 is the ARM-LPC4357 chip.
Embodiment 2:
Another embodiment of the present utility model utilizes the impressed voltage method.As shown in Figure 3, specifically the voltage source U0 of a characteristic frequency is added to wherein one group wherein one go up mutually of two groups of secondary coil of voltage transformers, recycle " U0 measurement " device with single-phase voltage detection phase voltage of the same name of another group voltage transformer (VT) is carried out sampling analysis, if adopted the voltage of this kind frequency and size, just think that mistake phenomenon arranged side by side has occurred two sections voltages, and the output sound and optic signal.
The size of this additional characteristic frequency driving voltage is very little, unlikely have influence on protection and, metering, and the work of relative assembly.
Embodiment 3:
Utilize following circuit: set specific frequency signal source U0 is by resistance R 1, and R2 carries out voltage distribution to resistance R,, by the ohmically pressure drop of R in the middle of detecting, determines whether by mistake side by side two groups of secondary coil of voltage transformers.
The voltage of the specific voltage U0 frequency at R two ends is zero when two groups of voltage secondary mistakes are arranged side by side, and U0 can be DC voltage.
Embodiment 4:
Be these characteristics of sudden change by the front and back arranged side by side poor variable quantity of phase voltage of the same name, by software program, judge whether to have occurred voltage transformer secondary mistake phenomenon arranged side by side.
During concrete enforcement, can adopt that one or more in above-mentioned four kinds of case methods form results or door or and gate logic, draw secondary voltage and whether miss conclusion arranged side by side.
Concrete which kind of logical combination that adopts fully can be according to the mutual induction of voltage implement body ruuning situation at scene and the long-term secondary numerical statistic data of secondary voltage.
Claims (7)
1. PT secondary according to claim 1 misses pick-up unit arranged side by side, it is characterized in that: analog to digital conversion (2) is connected with detected analog quantity (1), the output terminal of analog to digital conversion (2) is connected with the input end of CPU microprocessor (5), and the output terminal of CPU microprocessor (5) is connected with loudspeaker (4) with display (3) with Automatic monitoring systems (6) respectively.
2. PT secondary according to claim 1 misses pick-up unit arranged side by side, it is characterized in that: described detected analog quantity (1) is secondary coil of voltage transformer.
3. PT secondary according to claim 1 misses pick-up unit arranged side by side, and it is characterized in that: described microprocessor (5) is the ARM-LPC4357 chip.
4. PT secondary according to claim 1 misses pick-up unit arranged side by side, it is characterized in that: described analog to digital conversion (2) has two group of four phase voltage and detects and compare; Described detected analog quantity (1) is the A of two groups of secondary coil of voltage transformers, B, C, L terminal; Wherein analog to digital converter (2) is connected to the A of two groups of secondary coil of voltage transformers, B, and C, on the L terminal.
5. PT secondary according to claim 4 mistake pick-up unit arranged side by side is characterized in that: described two groups of secondary coil of voltage transformers wherein one group wherein one be equipped with a characteristic frequency voltage source U0 on mutually.
6. PT secondary according to claim 5 misses pick-up unit arranged side by side, and it is characterized in that: described voltage source U0 is the signal source of a non-work frequency.
7. PT secondary according to claim 5 misses pick-up unit arranged side by side, and it is characterized in that: the frequency of described characteristic frequency voltage source U0 is non-power-frequency voltage, and U0 is DC voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203083670U CN203287466U (en) | 2013-05-31 | 2013-05-31 | PT secondary false-parallel-connection detection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203083670U CN203287466U (en) | 2013-05-31 | 2013-05-31 | PT secondary false-parallel-connection detection apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203287466U true CN203287466U (en) | 2013-11-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203083670U Expired - Lifetime CN203287466U (en) | 2013-05-31 | 2013-05-31 | PT secondary false-parallel-connection detection apparatus |
Country Status (1)
| Country | Link |
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| CN (1) | CN203287466U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336190A (en) * | 2013-05-31 | 2013-10-02 | 国家电网公司 | PT secondary false parallel detection device |
-
2013
- 2013-05-31 CN CN2013203083670U patent/CN203287466U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336190A (en) * | 2013-05-31 | 2013-10-02 | 国家电网公司 | PT secondary false parallel detection device |
| CN103336190B (en) * | 2013-05-31 | 2016-09-07 | 国家电网公司 | Bis-mistake detection methods arranged side by side of PT |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131113 |