CN201402293Y - Distributed wireless insulation live testing system for high-voltage equipment - Google Patents

Distributed wireless insulation live testing system for high-voltage equipment Download PDF

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Publication number
CN201402293Y
CN201402293Y CN2009201075160U CN200920107516U CN201402293Y CN 201402293 Y CN201402293 Y CN 201402293Y CN 2009201075160 U CN2009201075160 U CN 2009201075160U CN 200920107516 U CN200920107516 U CN 200920107516U CN 201402293 Y CN201402293 Y CN 201402293Y
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China
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described
voltage
terminal
junction box
test
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CN2009201075160U
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Chinese (zh)
Inventor
鞠登峰
李忠晶
毕建刚
刘有为
阎春雨
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中国电力科学研究院
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Priority to CN2009201075160U priority Critical patent/CN201402293Y/en
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Abstract

The utility model relates to a distributed wireless insulation live testing system for high-voltage equipment, which is characterized by comprising at least three testing circuits. The testing circuits for testing voltage and current amplitudes and phase comprise a voltage data acquisition end and more than two current data acquisition ends, output ends of the voltage data acquisition end and thecurrent data acquisition ends are respectively connected with an input end of an acquisition terminal, and an output end of each acquisition terminal is connected with a control end through a wirelessnetwork. By utilizing a high-precision multi-circuit testing system formed by distributed sensor networks of the wireless sensor network transmission technique and the GPS synchronous acquisition technique, testing efficiency of the distributed wireless insulation live testing system is increased. Further, the distributed insulation live testing system can be widely applied to live testing for capacitive device capacitance, dielectric loss and arrester resistive current in various power systems.

Description

A kind of distributed wireless high-voltage equipment insulating live testing system

Technical field

The utility model relates to electrical equipment test macro in a kind of electric system, particularly about a kind of distributed wireless high-voltage equipment insulating live testing system of testing high voltage insulation of electrical installation situation.

Background technology

In order to grasp the insulation status of electric system high voltage electric equipment, need to adopt the live testing technology, periodically to charged capacitive apparatus in service carry out dielectric loss, electric capacity is measured, and lightning arrester is carried out measurement such as current in resistance property.Live testing to capacitive apparatus and lightning arrester is to compare with the equipment room current phase at present, measure relative phase difference, calculate relative dielectric loss, adopt wired concentrated mode, by test cable current signal is received same live testing instrument and compare measurement.But because the distance of equipment room is far away, test need connect very long test cable, can bring a lot of harmful effects like this, on the one hand because frequent wiring, terminal is disconnected, cause the danger of tested capacitive apparatus end screen (being test point) open circuit, the safe operation that jeopardizes equipment; On the other hand, can increase the workload of field wiring, and the length of lead can cause the error of measurement.Simultaneously-measured count and scope also all influenced.

Summary of the invention

At the problems referred to above, the purpose of this utility model provides a kind of high-level efficiency, distributed wireless high-voltage equipment insulating live testing system that measuring error is little.

For achieving the above object, the utility model is taked following technical scheme: a kind of distributed wireless high-voltage equipment insulating live testing system is characterized in that: it comprises at least three drive tests examination circuit; The described measurement circuit of test voltage and current amplitude and phase place comprises a voltage data collection terminal, more than two current data acquisition end, the output terminal of described voltage data collection terminal and described current data collection terminal is connected with the input end of an acquisition terminal respectively, and the output terminal of each described acquisition terminal is connected with a control end by wireless network.

Described voltage data collection terminal comprises a voltage transformer (VT), a test junction box and a current sensor; High-voltage signal on the equipment under test is output as low-voltage signal through described voltage transformer (VT), described low-voltage signal is connected through the input end of a resistance with described test junction box, contain described current sensor among the described test junction box, described test junction box's output terminal connects with the input end of corresponding described acquisition terminal.

Described current data collection terminal comprises a tested capacitive apparatus, another test junction box and another current sensor; The output terminal of described tested capacitive apparatus is connected with described another test junction box's input end, also contain described another current sensor among described another test junction box, described another test junction box's output terminal connects with the input end of corresponding described acquisition terminal.

Described acquisition terminal comprises an amplifier, an analog to digital converter, a clock, a PP pulse per second (PPS), a microprocessor, a wireless transmitter and a rechargeable battery; Described amplifier input terminal is connected with the described test junction box's of corresponding line output terminal, the output terminal of described amplifier is connected with the input end of described analog to digital converter as one road input signal, another road input signal of described analog to digital converter is connected with the output terminal of described clock, the input end of described clock is connected with the output terminal of described PP pulse per second (PPS), the output terminal of described analog to digital converter is connected with the input end of described microprocessor, the output terminal of described microprocessor is connected with described wireless transmitter by wireless network, and the described acquisition terminal of each measurement circuit all carries described rechargeable battery.

Described control end comprises a wireless transmitter, a main control system and a gps receiver; Described wireless transmitter is connected with the described wireless transmitter of the described acquisition terminal of prime by wireless network, the output terminal of the wireless transmitter of described control end is connected with described main control system by wireless network, and described main control system is connected with described gps receiver through wireless network again.

Described test junction box is a fixed equipment, links to each other with the earth terminal of described equipment under test; Each described test junction box is in the short circuit ground state when not testing, and each described test junction box is fixed to described acquisition terminal separately during test, and measured signal is inserted described acquisition terminal.

The utility model is owing to take above technical scheme, it has the following advantages: 1, therefore the utility model has improved the testing efficiency of system because the high-precision multi-channel test system that adopts that distributed sensor networks by wireless sensor network transmission technology and GPS synchronous acquisition technology constitutes.2, the utility model is because the high stability PP pulse per second (PPS) that utilizes GPS locking back output as starting the signal of gathering synchronously, has therefore reduced the measuring error of system.3, the utility model is owing to adopt the wireless sensor network of intelligent access type, therefore the distance between each test macro can be increased, break away from the constraint of test cable, and can accurately obtain the dielectric loss value of tested high voltage electric equipment insulation and the value of electric capacity.The utility model can be widely used in the live testing of capacitive apparatus electric capacity, dielectric loss and arrester resistance current in the various electric system.

Description of drawings

Fig. 1 is test system structure figure of the present utility model

Fig. 2 is the collection terminal electrical block diagram of test voltage amplitude of the present utility model and phase place

Fig. 3 is an acquisition terminal electrical block diagram of the present utility model

Fig. 4 is a control end electrical block diagram of the present utility model

Fig. 5 is the collection terminal electrical block diagram of measuring current amplitude of the present utility model and phase place

Fig. 6 is the PP pulse per second (PPS) test synchronous acquisition synoptic diagram of GPS of the present utility model

Embodiment

Below in conjunction with drawings and Examples the utility model is described in detail.

The utility model is the high precision measurement system that adopts the distributed sensor networks formation of wireless sensor network transmission technology and GPS synchronous acquisition technology.It comprises that at least three the tunnel carry out the measurement circuit that multistage is tested simultaneously to the high voltage electric equipment insulation status, and system's maximum can provide 255 drive tests examination circuit to test simultaneously, adopts the multi-channel test circuit to test the testing efficiency that can improve system simultaneously.Wherein drive test examination circuit is that the voltage magnitude and the phase place of tested insulator arrangement are tested, and other multi-channel test circuit is that the current amplitude and the phase place of tested insulator arrangement are measured.

As shown in Figure 1, the measurement circuit of multi-channel test voltage of the present utility model and current amplitude and phase place comprises a voltage data collection terminal 10, a plurality of current data collection terminals 20, the output terminal of voltage data collection terminal 10 and current data collection terminal 20 is connected with the input end of an acquisition terminal 30 respectively, and the output terminal of acquisition terminal 30 is connected by the public control end 40 of wireless network and each measurement circuit.

As shown in Figure 2; voltage data collection terminal 10 of the present utility model comprises that voltage transformer (VT) 11, one test junction boxes 12 and that convert high-voltage signal to low-voltage signal and have a protective effect convert current signal to voltage signal and have the current sensor 13 of isolating the electromagnetic interference (EMI) effect.High pressure U on the tested insulator arrangement 0Be output as low pressure U through voltage transformer (VT) 11 0', low pressure U 0' be connected through the input end of a resistance R 1 with test junction box 12, contain current sensor 13 among the test junction box 12.Test junction box's 12 bottom ground connection, test junction box's 12 output terminal out1 connects with the input end input of corresponding acquisition terminal 30.

As shown in Figure 3, current data collection terminal 20 structure functions of each measurement circuit of the present utility model are identical, current data collection terminal 20 comprises that tested capacitive apparatus 21, one 26S Proteasome Structure and Functions are with identical test junction box 22 of test junction box 12 and the identical current sensor 23 of current sensor 13 functions together.The output terminal of tested capacitive apparatus 21 is connected with test junction box's 22 input end, contains current sensor 23 among the test junction box 22.Test junction box's 22 bottom ground connection, test junction box's 22 output terminal out2 connects with the input end input of corresponding acquisition terminal 30.

As shown in Figure 4, acquisition terminal 30 structure functions of each measurement circuit of the present utility model are identical, acquisition terminal 30 comprises an amplifier 31, one analog to digital converter (ADC) 32, the clock 33 of one 16MHz, start high stability PP pulse per second (PPS) 34, one microprocessors (CPU) 35, one wireless transmitters (zigBee or WiFi) 36 and one rechargeable battery 37 of acquired signal synchronously once the conduct of gps receiver locking back output.The input end input of amplifier 31 is connected with the test junction box's of corresponding line output terminal out1, the output terminal of amplifier 31 is connected as the input end of one road input signal with analog to digital converter 32, another road input signal of analog to digital converter 32 is connected with the output terminal of the clock 33 of 16MHz, and the input end of clock 33 is connected with the output terminal of PP pulse per second (PPS) 34.The output terminal of analog to digital converter 32 is connected with the input end of microprocessor 35, and microprocessor 35 is controlled the signals collecting of 34 pairs of analog to digital converters 32 of PP pulse per second (PPS)s, and the signal data after gathering is done corresponding computing, and system's rear end radio communication.The output terminal of microprocessor 35 carries out data transmission by wireless network and wireless transmitter 36.And the acquisition terminal 30 of each drive test examination circuit all carries 30 power supplies of 37 pairs of acquisition terminals of rechargeable battery, dispense with outer connecting power.

As shown in Figure 5, control end 40 of the present utility model comprises a wireless transmitter 41, one main control systems 42 and a gps receiver 43.Wherein, also comprise the high stability PP pulse per second (PPS) 44 of exporting once GPS locking back.Wireless transmitter 41 carries out data transmission by the wireless transmitter 36 of wireless network and prime acquisition terminal, the output terminal of wireless transmitter 41 and main control system 42 also carry out data transmission by wireless network, and main control system 42 responsible states to acquisition terminal 30 monitor and control.Main control system 42 carries out data transmission through wireless network and gps receiver 43 again.

In the various embodiments described above, test junction box 22 is a fixed equipment, installs in advance when each measurement circuit has a power failure, and links to each other with the electric capacity end screen (being test point) of equipment under test 21 test points or the counter earth terminal of lightning arrester; Respectively test junction box 22 when not testing and be in the short circuit ground state, respectively test junction box 22 during test and play fixing acquisition terminal 30 separately, and measured signal is inserted acquisition terminal 30; Acquisition terminal 30 is a mobile device, only inserts test junction box 22 when test.

Present embodiment is in application, and each acquisition terminal 30 sends in the main control system 42 of control end 40 by wireless network in the calculating of finishing data acquisition, current amplitude and phase place synchronously down by analog to digital converter 32 separately of gps receiver again.Maximum system of the present utility model can be supported 255 acquisition terminals, 30 wireless access control main frames 42, and minimum system is three acquisition terminal wireless access control main frames 42.The data that main control system 42 is responsible for collecting each acquisition terminal, the net result of finishing dielectric loss, electric capacity or current in resistance property calculates.With three drive tests examination circuit is example, and main testing procedure of the present utility model is as follows:

Step 1, the reference device when selecting capacitive apparatus or lightning arrester live testing: the selection of reference device can be selected drive test examination circuit arbitrarily in the measurement circuit of multi-channel test current amplitude and phase place be reference device.In three drive tests of minimum system examination circuit, selecting the Third Road measurement circuit is that reference device 0, the second drive test examination circuit is equipment under test x, tests the second the road and the signal of Third Road measurement circuit simultaneously.Supposing to flow through, the electric current of tested capacitive is I among the equipment under test x Cx, the electric current of tested capacitive is I in the reference device of flowing through 0 C0, carry out the current and phase difference of signal calculated by microprocessor 35 separately.

Step 2, determine that each measurement circuit starts the time error of sampling: the two paths of signals of equipment under test x and reference device 0 starts the time error of sampling should be less than 2us.Because in distributed test system, every drive test examination circuit all has an independently analog to digital converter 32, each acquisition terminal 30 all adopts identical sampling rate, and the moment that starts collection must guarantee to be not more than 2us, otherwise " phase place " that the different acquisition terminal obtains can't compare;

As shown in Figure 6, reference device 0 is that the Third Road measurement circuit is that second drive test examination circuit is according to identical sampling rate T with equipment under test x s, carry out the identical data acquisition of total sampling time length t.Each acquisition terminal GPS synchronously after, the rising edge of reference device 0 and the GPS output PPS pulse per second (PPS) 34 of equipment under test x and absolute second maximum error constantly are less than ± 1us.Therefore, reference device 0 starts sampling instant t when the rising edge of the PPS pulse per second (PPS) 34 of its GPS output 0, start sampling instant t at the rising edge of the PPS pulse per second (PPS) 34 of its GPS output with equipment under test x x, both maximums start sampling time error Δ t less than 2us.

Step 3, each measurement circuit carry out synchronous signal acquisition: after selected reference equipment 0 and definite each measurement circuit started the time error of sampling, the signal that the collection terminal of every drive test examination circuit collects was input to each acquisition terminal 30.In each acquisition terminal 30, utilize of the high stability PP pulse per second (PPS) 34 of the absolute time error of GPS locking back output, as the signal of synchronous startup collection less than 1us;

Because each sampling finishes, to the time long (greater than 1s) of data processing, dislocation does not appear for guaranteeing that each sampling terminal can both start at the rising edge of identical PPS pulse per second (PPS) 34 to gather, each when the negative edge of the PP of GPS pulse per second (PPS) 44, send " ready " order for each measurement circuit by main control system 42 by wireless network, after each measurement circuit is received this order, all acquisition terminals 30 enter " ready " state, after the rising edge of the PP pulse per second (PPS) 34 of wait GPS separately arrives then, enter acquisition state.

Step 4, the data of gathering after finishing are carried out data computation by the microprocessor in each measurement circuit 35: capacitive apparatus or lightning arrester equipment are calculated the amplitude I of electric current by the microprocessor 35 in the acquisition terminal 30 of equipment under test x CxWith the current phase φ that starts the moment with respect to sampling IcxThe amplitude I of the electric current that capacitive apparatus or lightning arrester equipment are calculated by the microprocessor 35 in the acquisition terminal 30 of reference device 0 C0With the current phase φ of reference device 0 with respect to sampling instant Ic0System voltage is calculated the amplitude U of voltage by the microprocessor in the acquisition terminal in the first via measurement circuit 30 35 0With the voltage-phase φ that starts the moment with respect to sampling U0

Step 5, the net result of finishing dielectric loss, electric capacity and current in resistance property by main control system 42 calculate: each acquisition terminal 30 sends to main control system 42 with the result of calculation in the step 4 by the wireless receiving and dispatching network, for capacitive apparatus, carry out computing by main control system 42 according to following formula (1), (2), calculate the electric capacity and relative dielectric loss of tested capacitive apparatus:

C x=U 0/I cx (1)

C wherein xBe the electric capacity of tested capacitive apparatus, U 0Be system voltage amplitude, I CxCapacity current amplitude for tested capacitive apparatus.

tg φx0=tg(φ IcxIc0) (2)

Tg wherein φ x0Be the dielectric loss value of tested capacitive apparatus with respect to reference device 0, φ X0Be the current and phase difference of equipment under test with respect to reference device 0, φ IcxBe the current phase of tested capacitive apparatus with respect to sampling instant, φ Ic0Be the current phase of benchmark capacitive apparatus 0 with respect to sampling instant.

For lightning arrester equipment, carry out computing by main control system 42 according to following formula (3), calculate the current in resistance property of tested lightning arrester equipment:

I r=I cx·cos(φ IcxU0) (3)

I wherein rFor tested lightning arrester equipment with respect to system voltage U 0First-harmonic current in resistance property value, φ IcxBe the current phase of tested lightning arrester equipment with respect to sampling instant, φ U0Be the voltage-phase of system voltage with respect to sampling instant.

By above-mentioned five steps as can be known, by the cooperation of software and hardware, the synchronous startup sampling time error of distributed test system is less than 2us, and the measuring error of dielectric loss is less than 0.1%.Adopt the wireless sensor network of intelligent access type, can both can obtain relative dielectric loss value, also can obtain the value of electric capacity and the current in resistance property value of lightning arrester so that in the 200m test specification, simultaneously multiple devices are tested.

Claims (6)

1, a kind of distributed wireless high-voltage equipment insulating live testing system is characterized in that: it comprises at least three drive tests examination circuit; The described measurement circuit of test voltage and current amplitude and phase place comprises a voltage data collection terminal, more than two current data acquisition end, the output terminal of described voltage data collection terminal and described current data collection terminal is connected with the input end of an acquisition terminal respectively, and the output terminal of each described acquisition terminal is connected with a control end by wireless network.
2, want 1 described a kind of distributed wireless high-voltage equipment insulating live testing system as right, it is characterized in that: described voltage data collection terminal comprises a voltage transformer (VT), a test junction box and a current sensor; High-voltage signal on the equipment under test is output as low-voltage signal through described voltage transformer (VT), described low-voltage signal is connected through the input end of a resistance with described test junction box, contain described current sensor among the described test junction box, described test junction box's output terminal connects with the input end of corresponding described acquisition terminal.
3, want 1 described a kind of distributed wireless high-voltage equipment insulating live testing system as right, it is characterized in that: described current data collection terminal comprises a tested capacitive apparatus, another test junction box and another current sensor; The output terminal of described tested capacitive apparatus is connected with described another test junction box's input end, also contain described another current sensor among described another test junction box, described another test junction box's output terminal connects with the input end of corresponding described acquisition terminal.
4, want 1 described a kind of distributed wireless high-voltage equipment insulating live testing system as right, it is characterized in that: described acquisition terminal comprises an amplifier, an analog to digital converter, one clock, one PP pulse per second (PPS), a microprocessor, a wireless transmitter and a rechargeable battery; Described amplifier input terminal is connected with the described test junction box's of corresponding line output terminal, the output terminal of described amplifier is connected with the input end of described analog to digital converter as one road input signal, another road input signal of described analog to digital converter is connected with the output terminal of described clock, the input end of described clock is connected with the output terminal of described PP pulse per second (PPS), the output terminal of described analog to digital converter is connected with the input end of described microprocessor, the output terminal of described microprocessor is connected with described wireless transmitter by wireless network, and the described acquisition terminal of each measurement circuit all carries described rechargeable battery.
5, want 1 described a kind of distributed wireless high-voltage equipment insulating live testing system as right, it is characterized in that: described control end comprises a wireless transmitter, a main control system and a gps receiver; Described wireless transmitter is connected with the described wireless transmitter of the described acquisition terminal of prime by wireless network, the output terminal of the wireless transmitter of described control end is connected with described main control system by wireless network, and described main control system is connected with described gps receiver through wireless network again.
6, want 1 or 2 or 3 or 4 or 5 described a kind of distributed wireless high-voltage equipment insulating live testing systems as right, it is characterized in that: described test junction box is fixed equipment, links to each other with the earth terminal of described equipment under test; Each described test junction box is in the short circuit ground state when not testing, and each described test junction box is fixed to described acquisition terminal separately during test, and measured signal is inserted described acquisition terminal.
CN2009201075160U 2009-04-22 2009-04-22 Distributed wireless insulation live testing system for high-voltage equipment CN201402293Y (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102095938A (en) * 2010-03-08 2011-06-15 北京信息科技大学 High-precision signal processing method for insulation online monitoring of high-voltage electric-power capacitive equipment
CN102768330A (en) * 2011-04-29 2012-11-07 通用电气公司 System and device for detecting defects in underground cables
CN103426119A (en) * 2012-05-31 2013-12-04 山东电力集团公司青岛供电公司 Mobile operation terminal system used in electric power site
CN104062483A (en) * 2014-07-01 2014-09-24 杭州意能防雷技术有限公司 Distributed high voltage cable shielding layer current monitoring system and distributed high voltage cable shielding layer current monitoring method thereof
CN104267325A (en) * 2014-10-22 2015-01-07 国家电网公司 Insulation safety instrument power frequency voltage withstanding breakdown positioning device and method
CN104267237A (en) * 2014-09-25 2015-01-07 广东电网有限责任公司中山供电局 Resistive current measuring method and device for line arrester
CN106501689A (en) * 2016-11-03 2017-03-15 国网重庆市电力公司北碚供电分公司 A kind of distributed capacitive apparatus insulated electrification detection system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102095938A (en) * 2010-03-08 2011-06-15 北京信息科技大学 High-precision signal processing method for insulation online monitoring of high-voltage electric-power capacitive equipment
CN102095938B (en) * 2010-03-08 2012-11-21 北京信息科技大学 High-precision signal processing method for insulation online monitoring of high-voltage electric-power capacitive equipment
CN102768330A (en) * 2011-04-29 2012-11-07 通用电气公司 System and device for detecting defects in underground cables
CN102768330B (en) * 2011-04-29 2016-06-01 通用电气公司 For detecting system and the device of the defect in buried cable
CN103426119A (en) * 2012-05-31 2013-12-04 山东电力集团公司青岛供电公司 Mobile operation terminal system used in electric power site
CN103426119B (en) * 2012-05-31 2016-05-11 山东电力集团公司青岛供电公司 The on-the-spot mobile operating terminal system of using of electric power
CN104062483A (en) * 2014-07-01 2014-09-24 杭州意能防雷技术有限公司 Distributed high voltage cable shielding layer current monitoring system and distributed high voltage cable shielding layer current monitoring method thereof
CN104267237B (en) * 2014-09-25 2017-10-20 广东电网有限责任公司中山供电局 Leakage conductor current in resistance property measuring method and device
CN104267237A (en) * 2014-09-25 2015-01-07 广东电网有限责任公司中山供电局 Resistive current measuring method and device for line arrester
CN104267325B (en) * 2014-10-22 2017-05-24 国家电网公司 Insulation safety instrument power frequency voltage withstanding breakdown positioning device and method
CN104267325A (en) * 2014-10-22 2015-01-07 国家电网公司 Insulation safety instrument power frequency voltage withstanding breakdown positioning device and method
CN106501689A (en) * 2016-11-03 2017-03-15 国网重庆市电力公司北碚供电分公司 A kind of distributed capacitive apparatus insulated electrification detection system

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