CN105467352A - Intelligent substation secondary side electric energy metering system detection method - Google Patents
Intelligent substation secondary side electric energy metering system detection method Download PDFInfo
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- CN105467352A CN105467352A CN201510407979.9A CN201510407979A CN105467352A CN 105467352 A CN105467352 A CN 105467352A CN 201510407979 A CN201510407979 A CN 201510407979A CN 105467352 A CN105467352 A CN 105467352A
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Abstract
The invention provides an intelligent substation secondary side electric energy metering system detection method. According to the method, with a UTC time as a standard, through two integrated detection devices, voltage and current signals are outputted synchronously, the power factors of the voltage and current signals are ensured, and the electric energy values synchronously outputted by the two integrated detection devices are calculated and are sent to a control center through a wireless way. A control center receives the electric energy pulse outputted by a digital electric energy meter and compares the electric energy value and the electric energy values outputted by the integrated detection devices at the same time, and an electric energy metering error is calculated. An existing detection device can not control the output synchronization of multiple equipments, the power factors of output current and voltage signals can not be determined, the problems of the distribution of an intelligent substation voltage combination unit and a current combination unit in different places, long distance and unsafe field detection can not be solved, and by using the method of the invention, the problems of distance and power factors and detection safety caused by the distribution of the intelligent substation voltage combination unit and the current combination unit in different places can be effectively solved.
Description
Technical field
The present invention relates to a kind of Intelligent transformer station secondary side electric energy metered system detection method, belong to Electric Energy Metering Technology field.
Background technology
In current Intelligent transformer station, substantially all have employed merge cells and add digitalized electrical energy meter as substation secondary side electric energy metered system, therefore to realize the Site Detection of Intelligent transformer station electric energy metered system, must carry out in conjunction with voltage, electric current merge cells and digitalized electrical energy meter simultaneously.Due to voltage merge cells, the distribution of electric current merge cells strange land, existing standard set-up cannot synchronism output, power factor (PF) cannot be determined, the digitalized electrical energy meter Site Detection work based on merge cells cannot be carried out, directly affects accuracy and the reliability of Intelligent transformer station electric energy metered system, therefore be necessary very much to carry out the digitalized electrical energy meter Site Detection work based on merge cells, guarantee accuracy and the reliability of Intelligent transformer station electric energy metered system.
Summary of the invention
The object of the invention is, in order to solve Intelligent transformer station voltage, electric energy metered system that electric current merge cells profile samples is brought cannot test problems, and the present invention proposes a kind of Intelligent transformer station secondary side electric energy metered system detection method.
Realizing technical scheme of the present invention is, the inventive method with the UTC time for standard, by 2 comprehensive detection device synchronism output voltages, current signals, guarantee the power factor (PF) of voltage, current signal, calculate the energy value of two comprehensive detection device synchronism output, and be wirelessly sent to control center; Control center receives the electrical energy pulse that digitalized electrical energy meter exports, and the energy value that its energy value and comprehensive detection device export is compared simultaneously, calculates electric energy metering error.
The energy value of two comprehensive detection device synchronism output is according to following formulae discovery:
The energy value computing formula of digitalized electrical energy meter is:
W
P2＝m
P/C
W
Q2＝m
Q/C
Namely the active energy value of electric energy meter is for meritorious pulse measurement number is divided by meter constant, and reactive energy value is that idle pulse measurement number is divided by meter constant.
In formula, W
p1for the active energy of comprehensive detection device synchronism output; The W of comprehensive detection device synchronism output
q1reactive energy; m
pfor active energy umber of pulse; m
qfor reactive energy umber of pulse; Δ P is carved with merit performance number in the some time; Δ Q is certain moment reactive power value; U
nfor voltage sample value; Cos φ
nfor the cosine value of voltage sample value and current sampling data angle; Sin φ
nfor the sine value of voltage sample value and current sampling data angle; W
p2for the active energy of digitalized electrical energy meter; W
q2for the reactive energy of digitalized electrical energy meter.
Both sides' electric energy metrical time is calculated by control center, and initial time is with the UTC clock T of comprehensive detection device output voltage, electric current
1as standard, the end time stops the UTC clock T of output voltage, electric current with comprehensive detection device
2as standard, the electric energy metrical time is: T=T
2-T
1.
The inventive method adopts sets up filed detection system by two comprehensive detection devices and control center, and control center is as the server of detection system, and two comprehensive detection devices are connected to control center, sets up the information channel with control center.
Described comprehensive detection device is a kind of clock standard source device, in the time of agreement, can synchronously trigger the three-phase ac signal producing certain frequency, phase place, amplitude with GPS pulse per second (PPS); Described device has GPS module and wireless GPRS module interface, can realize the transmission with the electric current of control center, voltage, phase place, frequency data by radio communication.
Described control center has GPS and wireless communication module, Site Detection scheme is formulated by described control center, determine the time of described comprehensive detection device output three-phase voltage, current signal, frequency and power factor (PF), receive the energy value of two comprehensive detection devices outputs and the energy value of digitalized electrical energy meter simultaneously, complete the error of calculation.
The step of Intelligent transformer station secondary side electric energy metered system detection method of the present invention is as follows:
(1) voltage merge cells and the electric current merge cells of access digitalized electrical energy meter is first selected, the voltage circuit of its voltage merge cells and the corresponding digitalized electrical energy meter of electric current merge cells difference and current return.
(2) the voltage output loop of two comprehensive detection devices, electric current output loop are linked into voltage merge cells and electric current merge cells respectively, before access, need the voltage circuit of former access merge cells to open a way, short circuit of current loop.
(3) detection system is built.By the mode of radio communication, set up filed detection system by two comprehensive detection devices and control center, control center is as the server of detection system, and two comprehensive detection devices are connected to control center, sets up the information channel with control center.
(4) control center formulates Intelligent transformer station based on the digitalized electrical energy meter Site Detection scheme of merge cells, comprising the information such as parameter, Detection of content of the start-up time detected, tested merge cells and digitalized electrical energy meter.
(5) with the UTC time for standard, two comprehensive detection devices are according to the detection start-up time of solution formulation, three-phase alternating current, voltage signal is exported at stipulated time point, ensure that frequency, the power factor (PF) of voltage, current signal meet the demands simultaneously, carry out the Site Detection of electric energy metrical accuracy.Detection of content comprises: under the test of false actuation test, starting characteristics test, constant, balanced load, the electric energy fundamental error test of different capacity factor, different current value; Under unbalance load, the forward of different capacity factor, different current value is gained merit, oppositely gain merit, forward is idle, the test of reverse reactive energy fundamental error;
(6) electrical energy pulse of the energy value that exports according to two comprehensive detection devices of control center and digitalized electrical energy meter, compares both errors, obtains testing result.
(7) after completing detection, the output voltage of comprehensive detection device, current return are disconnected, by the voltage circuit of former access merge cells, current return restores to the original state.
The present invention's beneficial effect is compared with the prior art, output synchronism between the uncontrollable multiple devices of existing pick-up unit, the power factor (PF) of output current voltage signal cannot be determined, Intelligent transformer station voltage merge cells cannot be solved and electric current merge cells strange land distributes, distance, the unsafe problem of Site Detection, the present invention is by multiple stage comprehensive detection device and control center, adopt the inventive method effectively can solve Intelligent transformer station voltage merge cells and electric current merge cells strange land to distribute the distance caused, power factor (PF) and detect security problem.
Accompanying drawing explanation
Fig. 1 is Intelligent transformer station secondary side electric energy metered system testing circuit schematic diagram of the present invention.
Embodiment
Figure 1 shows that the present embodiment Intelligent transformer station secondary side electric energy metered system testing circuit, comprise control center and two comprehensive detection devices.
Select tested voltage merge cells, electric current merge cells, determine the voltage, the current return that access corresponding digitalized electrical energy meter; The voltage output loop of two comprehensive detection devices, electric current output loop are linked into voltage merge cells and electric current merge cells respectively; Two comprehensive detection devices and control center wirelessly, build filed detection system.
Interconnect with wireless network card, gps antenna respectively by two comprehensive detection devices; First comprehensive detection device connects optical Ethernet switch by current return merge cells, then connects digitalized electrical energy meter by optical Ethernet switch; Second comprehensive detection device connects current return merge cells by voltage circuit merge cells; Control center interconnects with digitalized electrical energy meter, wireless network card respectively.
Control center formulates Site Detection scheme.
According to detection scheme, start detection:
With the UTC time for standard, two comprehensive detection devices are according to the detection start-up time of solution formulation, export three-phase alternating current, voltage signal at stipulated time point, ensure the frequency of voltage, current signal simultaneously, power factor (PF) meets the demands, carry out the Site Detection of electric energy metrical accuracy.Detection of content comprises: under the test of false actuation test, starting characteristics test, constant, balanced load, the electric energy fundamental error test of different capacity factor, different current value; Under unbalance load, the forward of different capacity factor, different current value is gained merit, oppositely gain merit, forward is idle, the test of reverse reactive energy fundamental error;
The electrical energy pulse of the energy value that control center exports according to two comprehensive detection devices and digitalized electrical energy meter, compares both errors, obtains testing result.
After completing detection, the output voltage of comprehensive detection device, current return are disconnected, by the voltage circuit of former access merge cells, current return restores to the original state.
Claims (4)
1. an Intelligent transformer station secondary side electric energy metered system detection method, it is characterized in that, described method with the UTC time for standard, by 2 comprehensive detection device synchronism output voltages, current signals, guarantee the power factor (PF) of voltage, current signal, calculate the energy value of two comprehensive detection device synchronism output, and be wirelessly sent to control center; Control center receives the electrical energy pulse that digitalized electrical energy meter exports, and the energy value that its energy value and comprehensive detection device export is compared simultaneously, calculates electric energy metering error.
2. Intelligent transformer station secondary side electric energy metered system detection method according to claim 1, the energy value of two comprehensive detection device synchronism output is according to following formulae discovery:
The energy value computing formula of digitalized electrical energy meter is:
W
P2＝m
P/C；
W
Q2＝m
Q/C；
Namely the active energy value of electric energy meter is in T time length, and meritorious pulse measurement number is divided by meter constant, and reactive energy value is in T time length, and idle pulse measurement number is divided by meter constant;
In formula, W
p1for the active energy of comprehensive detection device synchronism output; The W of comprehensive detection device synchronism output
q1reactive energy; m
pfor active energy umber of pulse; m
qfor reactive energy umber of pulse; Δ P is carved with merit performance number in the some time; Δ Q is certain moment reactive power value; U
nfor voltage sample value; Cos φ
nfor the cosine value of voltage sample value and current sampling data angle; Sin φ
nfor the sine value of voltage sample value and current sampling data angle; W
p2for the active energy of digitalized electrical energy meter; W
q2for the reactive energy of digitalized electrical energy meter;
Both sides' electric energy metrical time is calculated by control center, and initial time is with the UTC clock T of comprehensive detection device output voltage, electric current
1as standard, the end time stops the UTC clock T of output voltage, electric current with comprehensive detection device
2as standard, the electric energy metrical time is: T=T
2-T
1.
3. Intelligent transformer station secondary side electric energy metered system detection method according to claim 1, it is characterized in that, described comprehensive detection device in the time of agreement, can synchronously trigger the three-phase ac signal producing certain frequency, phase place, amplitude with GPS pulse per second (PPS); Described device has GPS module and wireless GPRS module interface, can realize the transmission with the electric current of control center, voltage, phase place, frequency data by radio communication.
4. Intelligent transformer station secondary side electric energy metered system detection method according to claim 1, it is characterized in that, described control center has GPS and wireless communication module, Site Detection scheme is formulated by described control center, determine the time of described comprehensive detection device output three-phase voltage, current signal, frequency and power factor (PF), receive the energy value of two comprehensive detection devices outputs and the energy value of digitalized electrical energy meter simultaneously, complete the error of calculation.
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| CN109298705A (en) * | 2018-10-22 | 2019-02-01 | 国网江西省电力有限公司电力科学研究院 | A kind of digitlization measure and control device off-line checking system and method based on combining unit |
| CN111090003A (en) * | 2019-11-14 | 2020-05-01 | 国网江西省电力有限公司电力科学研究院 | Synchronous direct current electric energy metering system based on Beidou/GPS clock |
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Cited By (3)
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| CN111090003A (en) * | 2019-11-14 | 2020-05-01 | 国网江西省电力有限公司电力科学研究院 | Synchronous direct current electric energy metering system based on Beidou/GPS clock |
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Application publication date: 20160406 |