CN202126463U - Wireless secondary voltage drop testing device - Google Patents
Wireless secondary voltage drop testing device Download PDFInfo
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- CN202126463U CN202126463U CN2011202336288U CN201120233628U CN202126463U CN 202126463 U CN202126463 U CN 202126463U CN 2011202336288 U CN2011202336288 U CN 2011202336288U CN 201120233628 U CN201120233628 U CN 201120233628U CN 202126463 U CN202126463 U CN 202126463U
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Abstract
The utility model discloses a wireless secondary voltage drop testing device which has high accuracy and high reliability and is easy to operate. The wireless secondary voltage drop testing device comprises a main machine and an auxiliary machine which adopt wireless communication, wherein the main machine comprises a sampling circuit I, a synchronous signal generating and transmitting circuit I, a shaping circuit, a CPU (central processing unit) I and a microwave signal receiving and transmitting circuit I; the auxiliary machine comprises a sampling circuit II, an A/D (analog-to-digital) conversion circuit II, a CPU II, a synchronous signal generating and transmitting circuit II and a microwave signal receiving and transmitting circuit II; the CUP II is connected with a voltage transformer in a transformer substation; the CPU I is connected with an electric energy meter of a control chamber; and after being revised by the shaping circuit, an analog signal collected by the auxiliary machine is converted together with a voltage analog signal collected by the main machine, and then the two converted analog signals are compared and computed in the CPU I to obtain secondary voltage drop. In the utility model, the traditional method of utilizing GPS (global position system) for signal synchronization is abandoned, and the synchronous signal generating and transmitting circuit I and the synchronous signal generating and transmitting circuit II in the device are adopted to provide synchronous signals with high accuracy for the system CPUs, so that the testing accuracy of the device is ensured.
Description
Technical field
The utility model relates to electric system secondary voltage drop proving installation.
Background technology
The voltage transformer (VT) (PT) that is installed in the transformer station has one section long distance with the pulpit that all kinds of controls, test instrumentation are installed generally speaking; Lead between this is referred to as the secondary lead; Long secondary lead has caused the inconsistent of voltage magnitude and phase place on PT secondary terminals voltage and the table meter terminal, thereby has brought electric energy metering error.The electric power meter voltage transformer secondary loop voltage that has clear and definite regulation, I, II class to be used for trade settlement to this among " electric power meter technical management rules " DL/T448-2000 is fallen and should be not more than 0.2% of its rated secondary voltage; The voltage transformer secondary loop voltage is fallen and should be not more than 0.5% of its rated secondary voltage in other electric power meter.Simultaneously, also explicitly call for operating voltage transformer secondary loop voltage is fallen and should regularly be detected.Therefore, have high precision, high reliability, convenient easy-to-use secondary voltage drop proving installation provides very important means of testing to the secondary voltage drop test of transformer voltage transformer secondary circuit at the scene to electric system.The measuring method of secondary voltage drop has the direct method of measurement and the indirect method of measurement at present.
The direct method of measurement is to connect test instrumentation respectively at transformer device end and pulpit end, connects with lead between the two, and test result is between the two analyzed comparison, draws corresponding test data.Obviously, the weak point of the direct method of measurement is the lead that will connect long distance between the two, and operation is very inconvenient, and the time has been grown, and the lead wearing and tearing also can threaten to operating personnel's safety.
The indirect method of measurement is to be installed on the subsidiary engine of transformer end and the main frame composition of installation and electric power meter end, and subsidiary engine sends data measured to main frame through Wireless transmission mode, and main frame compares analytical calculation, draws the test data that needs.The advantage of the method is to lay interim secondary lead, and is easy to operate, safe.Aspect wireless transmission, all be to adopt GPS to carry out signal Synchronization at present on the market, and the major defect of the wireless secondary voltage drop measurement mechanism of GPS synchronous mode is following 2 points:
(1) under some environment and under the weather conditions, can't receive the synchronizing signal of GPS, will occur like this can't synchronia and cause accomplishing measuring task.
(2) carry out sampled signal when relatively calculating at main frame; What adopt is digital signal; This signal that just requires subsidiary engine and main frame synchronization to collect wants strictness to be consistent; All will cause two signals can not be one by one corresponding and erroneous judgement and erroneous calculations occur when leak source appears in arbitrary side's acquired signal, have a strong impact on measuring accuracy.
To the weak point of like product in the market, press for a kind of novel wireless secondary voltage drop proving installation of development, so that the testing apparatus of a kind of high precision, high reliability, processing ease to be provided.
The utility model content
The utility model technical matters to be solved is the deficiency that overcomes prior art; The testing apparatus of a kind of high precision, high reliability, processing ease is provided; Under the test environment of complicacy, the test success ratio has reached absolutely, and test index can reach the concerned countries standard fully.
The technical scheme that the utility model adopted is: the wireless secondary voltage drop proving installation that the utility model relates to comprises main frame that is arranged at the electric energy meter side and the subsidiary engine that is arranged on the voltage transformer (VT) output terminal, and said subsidiary engine comprises:
The sample circuit II, the simulating signal that is used to gather the voltage transformer (VT) output end voltage;
A/D change-over circuit II is carried out analog to digital conversion with above-mentioned simulating signal;
The CPU II is handled and coordinates the operation of subsidiary engine each several part circuit to the digital signal after the conversion;
Microwave signal transmission circuit II, in order to said host communication, the digital signal after handling is sent to main frame;
Said main frame comprises:
The sample circuit I, the simulating signal that is used to gather electric energy meter side voltage;
Microwave signal transmission circuit I, corresponding with above-mentioned microwave signal transmission circuit II, be used for and said subsidiary engine communication;
Shaping circuit is used for the digital signal that receives is carried out three grades of conversion of signals of D/A-A/D-D/A, and signal is carried out shaping and correcting process; What obtain after the conversion is the sinusoidal curve of a complete and smooth, can not influence computational accuracy;
A/D change-over circuit I is digital signal with the simulating signal of above-mentioned sample circuit I collection with through the revised analog signal conversion of shaping circuit, and sends in the CPU I;
The CPU I compares computing to the signal after the A/D conversion, and calculate secondary voltage drop, and the result is carried out analyzing and processing, and the operation of coordinating main frame each several part circuit.
Further; Said main frame comprises that also synchronizing signal produces and the transmission circuit I; Said subsidiary engine comprises that also synchronizing signal produces and the transmission circuit II; To CPU I and CPU II output synchronization bit clock and synchronization character clock, CPU I and CPU II begin to export digital signal after receiving synchronization bit clock and synchronization character clock respectively for said synchronizing signal generation and transmission circuit I and synchronizing signal generation and transmission circuit II.
Further, said main frame also comprises the output circuit that is connected with said CPU I, outputs test data in order to equipment to external world.
Above-mentioned wireless secondary voltage drop proving installation is through gathering the voltage and the phase signal of voltage transformer (VT) end, can also test electrical parameters such as U in ratio, angular difference and the power circuit of secondary loop in power system, I, P, Q, φ, F.
The beneficial effect of the utility model is following:
1. about signal Synchronization; In the technical scheme of the utility model; Given up traditional GPS that utilizes and carried out the mode of signal Synchronization, utilized programmable wireless transmission chip and control corresponding software, after system's operation beginning; Main and auxiliaries can be set up communication according to the instruction between that CPU separately sends and connect; In case successful connection, synchronizing signal generation and transmission circuit I and synchronizing signal produce and the transmission circuit II is just exported synchronization bit clock and word clock to the CPU of main and auxiliaries respectively, and prepare to transmit data.This mode do not rely on GPS to the time synchronous, synchronization accuracy is high, cost is low, measuring process is simply quick.
2. about Signal Processing and calculating; Carry out sampled signal when relatively calculating at main frame; What adopt is the aforesaid shaping circuit correction of simulating signal process, leak source at a time occurs even that is to say the signal that collects, but before the main and auxiliaries signal relatively reaches calculating; Can correction and shaping processing have been carried out to the subsidiary engine acquired signal that receives; The digital signal that obtains is carried out the D/A---A/D---D/A conversion, and what obtain is the sinusoidal curve of a complete and smooth, so can not influence computational accuracy.The benefit of this mode is: on-the-spot antijamming capability strengthens greatly, and the measuring accuracy of the mode angle difference more synchronous than GPS improves 10 times.
3. aspect the microwave signal transmission,, developed portable high-gain microwave antenna specially for guaranteeing the success ratio and the reliability of data transmission for this reason.Under the test environment of complicacy, the test success ratio has reached absolutely, and test index has reached the concerned countries standard fully.
Description of drawings
Fig. 1 is the circuit system structure block diagram of the utility model.
Embodiment
As shown in Figure 1; The utility model is connected in transformer station and the pulpit circuit system; It comprises the main frame 1 that is positioned at the electric energy meter side and the subsidiary engine 2 of voltage transformer (VT) side, and said main frame 1 comprises that sample circuit I 11, shaping circuit 13, CPU I 16, synchronizing signal produce and transmission circuit I 14, microwave signal transmission circuit I 15, A/D change-over circuit I 17 and output circuit 18.Sample circuit I 11 is connected in the electric energy meter side, gathers voltage analog signal; The digital signal that receiving microwave signals 15 receives from subsidiary engine; Be converted into the simulating signal of correction through shaping circuit 13; The simulating signal that the simulating signal that A/D change-over circuit I 17 will be revised is gathered with sample circuit I 11 converts digital signal again into and gets into CPU I 16, and the signal after 16 pairs of A/D conversions of CPU I compares computing, calculates secondary voltage drop; And the result carried out analyzing and processing, and by output circuit 18 to external world equipment output test result.The transfer process of above-mentioned shaping circuit 13 is to adopt three grades of common signaling conversion circuits, i.e. D/A---A/D---D/A conversion of signals is revised, shaping to the received signal, obtains the sinusoidal curve of a complete and smooth.
Said subsidiary engine 2 comprises sample circuit II 21, A/D change-over circuit II 23, CPU II 24, synchronizing signal generation and transmission circuit II 22, power amplification circuit 25, microwave signal transmission circuit II 26; Said sample circuit II 21 is gathered the voltage and the phase signal of voltage transformer (VT) end; Carry out analog to digital conversion and feed back to CPU II 24 carrying out the coded modulation processing through A/D change-over circuit II 23; Signal after the processing sends through power amplification circuit 25 and microwave signal transmission circuit II 26 successively, this microwave signal transmission circuit II 26 and 15 wireless connections of above-mentioned microwave signal transmission circuit I; Said synchronizing signal produces and transmission circuit I 14 produces with synchronizing signal and transmission circuit II 22 is exported synchronization bit clock and synchronization character clocks to CPU I 16 and CPU II 24 respectively, and CPU I 16 begins to export digital signal with CPU II 24 after receiving synchronization bit clock and synchronization character clock.
Explanation of present embodiment each part mentioned above and realization principle are following:
1 " sample circuit (I, II): obtain on-the-spot measured signal, be simulating signal.
2 " A/D change-over circuit (I, II): the signal that collects is carried out go forward side by side line number mould conversion of preposition amplification.
3 " CPU (I, II): main control circuit, digital signal is analyzed, adopt certain coding rule to encode and modulate then.Signal to after the A/D conversion compares computing, calculates the secondary voltage drop value.Synchronizing signal is produced and transmission circuit I, II are carried out initial configuration, coordinate the operation of each several part circuit and software, after receiving synchronization character clock and synchronization bit clock, begin to export digital signal.
4 " synchronizing signal produces and transmission circuit (I, II): after main and auxiliaries powers on; Instruction between according to CPU sends is set up the communication connection; In case successful connection just respectively to the CPU of main and auxiliaries output synchronization bit clock and word clock, and is prepared the transmission data.
5 " shaping circuit: adopt three grades of signaling conversion circuits, i.e. D/A---A/D---D/A conversion of signals is revised, shaping to the received signal.
6 " power amplification circuit: the signal to the needs transmission carries out power amplification.
7 " microwave signal transmission circuit (I, II): main frame, subsidiary engine all adopt the microwave transmission pattern of high frequency to carry out wireless transmission and reception, to guarantee the real-time of transmission signals.For guaranteeing the success ratio and the reliability of data transmission, the utility model has been developed portable high-gain microwave antenna specially for this reason when being enforcement.
8 " output circuit: test data is transferred to output devices such as display, printer, COM1.
Claims (3)
1. wireless secondary voltage drop proving installation comprises main frame that is arranged at the electric energy meter side and the subsidiary engine that is arranged on the voltage transformer (VT) output terminal it is characterized in that said subsidiary engine comprises:
The sample circuit II, the simulating signal that is used to gather the voltage transformer (VT) output end voltage;
A/D change-over circuit II is carried out analog to digital conversion with above-mentioned simulating signal;
The CPU II is handled and coordinates the operation of subsidiary engine each several part circuit to the digital signal after the conversion;
Microwave signal transmission circuit II, in order to said host communication, the digital signal after handling is sent to main frame;
Said main frame comprises:
The sample circuit I, the simulating signal that is used to gather electric energy meter side voltage;
Microwave signal transmission circuit I, corresponding with above-mentioned microwave signal transmission circuit II, be used for and said subsidiary engine communication;
Shaping circuit is used for the digital signal that receives is carried out three grades of conversion of signals of D/A-A/D-D/A, and signal is gathered and correcting process;
A/D change-over circuit I is digital signal with the simulating signal of above-mentioned sample circuit I collection with through the revised analog signal conversion of shaping circuit, and sends in the CPU I;
The CPU I compares computing to the signal after the A/D conversion, and calculate secondary voltage drop and the result is carried out analyzing and processing, and the operation of coordinating main frame each several part circuit.
2. wireless secondary voltage drop proving installation according to claim 1; It is characterized in that; Said main frame comprises that also synchronizing signal produces and the transmission circuit I; Said subsidiary engine comprises that also synchronizing signal produces and the transmission circuit II, and to CPU I and CPU II output synchronization bit clock and synchronization character clock, CPU I and CPU II begin to export digital signal after receiving synchronization bit clock and synchronization character clock respectively for said synchronizing signal generation and transmission circuit I and synchronizing signal generation and transmission circuit II.
3. wireless secondary voltage drop proving installation according to claim 1 is characterized in that said main frame also comprises the output circuit that is connected with said CPU I, outputs test data in order to equipment to external world.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202336288U CN202126463U (en) | 2011-07-05 | 2011-07-05 | Wireless secondary voltage drop testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202336288U CN202126463U (en) | 2011-07-05 | 2011-07-05 | Wireless secondary voltage drop testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202126463U true CN202126463U (en) | 2012-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202336288U Expired - Lifetime CN202126463U (en) | 2011-07-05 | 2011-07-05 | Wireless secondary voltage drop testing device |
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| CN (1) | CN202126463U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262180A (en) * | 2011-07-05 | 2011-11-30 | 珠海市科荟电器有限公司 | Wireless secondary voltage drop test device |
| CN102944810A (en) * | 2012-12-12 | 2013-02-27 | 湖南省电力公司科学研究院 | Test device for secondary circuit zero line site of voltage transformer |
| CN107153133A (en) * | 2017-04-24 | 2017-09-12 | 祝曙光 | Secondary voltage drop/load on-line monitoring system |
-
2011
- 2011-07-05 CN CN2011202336288U patent/CN202126463U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262180A (en) * | 2011-07-05 | 2011-11-30 | 珠海市科荟电器有限公司 | Wireless secondary voltage drop test device |
| CN102944810A (en) * | 2012-12-12 | 2013-02-27 | 湖南省电力公司科学研究院 | Test device for secondary circuit zero line site of voltage transformer |
| CN107153133A (en) * | 2017-04-24 | 2017-09-12 | 祝曙光 | Secondary voltage drop/load on-line monitoring system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120125 |
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| CX01 | Expiry of patent term |