CN106980070A - The measuring system and method for a kind of transmission line parameter - Google Patents

The measuring system and method for a kind of transmission line parameter Download PDF

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Publication number
CN106980070A
CN106980070A CN201710332193.4A CN201710332193A CN106980070A CN 106980070 A CN106980070 A CN 106980070A CN 201710332193 A CN201710332193 A CN 201710332193A CN 106980070 A CN106980070 A CN 106980070A
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China
Prior art keywords
relay
phases
phase
original state
voltmeter
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CN201710332193.4A
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Inventor
王伟
张弛
满玉岩
李隆基
文清丰
王晓光
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
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Priority to CN201710332193.4A priority Critical patent/CN106980070A/en
Publication of CN106980070A publication Critical patent/CN106980070A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead

Abstract

The present invention relates to a kind of measuring system of transmission line parameter and method, its technical characterstic is：Including single phase poaer supply, relay group, four ammeters, four voltmeters and microprocessor；Ammeter IA, ammeter IB, ammeter ICIt is connected to the current value for being respectively used to measure three-phase circuit in three-phase circuit；Voltmeter UA, voltmeter UB, voltmeter UCIt is connected to the magnitude of voltage for being respectively used to measure three-phase circuit in three-phase circuit；Ammeter Is is connected between relay J1, relay J2, relay J3 and single phase poaer supply to the output current for measuring single phase poaer supply, and the two ends that voltmeter Us is arranged on single phase poaer supply are used to measure single phase poaer supply output voltage values；The different break-makes combination of microprocessor control relay group, realizes the measurement function of transmission line of electricity different parameters.

Description

The measuring system and method for a kind of transmission line parameter
Technical field
The invention belongs to electric power transmission line technical field, the measuring system of especially a kind of transmission line parameter and side Method.
Background technology
Transmission line of electricity is the important component of power system.Newly-built and reconstruction ultra-high-tension power transmission line is putting it into operation It is preceding, it is necessary to measure various power frequency parameter values, these parameters will directly affect relay protection setting calculation, Load flow calculation, failure and survey Away from, calculation of short-circuit current, line losses management and power system operation mode selection final result.At present, transmission line parameter The supply unit of measurement passes through three phase mains output and three-phase electricity usually using three-phase regulator and three-phase isolation transformer Pressure, current measurement and calculating realize that line parameter circuit value is measured.Because three phase mains device volume weight is larger, onsite moving is difficult, And test connection is more, easily there is wiring error.Particularly in recent years, it is more and more with tower and the parallel construction of line, when neighbouring Very strong line-frequency induction interference can be produced during circuit charging operation, on test line.For ensure measurement result the degree of accuracy, it is necessary to Increase experiment power supply capacity to overcome the harmful effect that inductive interference is produced；Due to experiment power supply capacity more large volume weight more Greatly, inconvenience is brought to in-site measurement work.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of reasonable in design, reliability it is high, be readily transported Installation and the measuring system and method for transmission line parameter easy to use.
The present invention solves its technical problem and takes following technical scheme to realize：
A kind of measuring system of transmission line parameter, including single phase poaer supply, relay group, four ammeters, four voltages Table and microprocessor；Ammeter IA, ammeter IB, ammeter ICIt is connected to and is respectively used to measure three-phase circuit in three-phase circuit Current value；Voltmeter UA, voltmeter UB, voltmeter UCIt is connected to the magnitude of voltage for being respectively used to measure three-phase circuit in three-phase circuit； Relay J1, relay J2, relay J3 are connected in three-phase circuit；The ammeter Is be connected to relay J1, after To measure the output current of single phase poaer supply between electrical equipment J2, relay J3 and single phase poaer supply, the single phase poaer supply other end by after Electrical equipment J4, relay J5, relay J6 are connected on three-phase circuit, and the voltmeter Us is arranged on the two ends of single phase poaer supply For measuring single phase poaer supply output voltage values, voltmeter Us is grounded by relay J13；Relay J7, relay J8, relay Device J9 is connected between three-phase circuit and ground wire respectively, and relay J10, J11, J12 are connected to voltmeter UA, voltmeter UB, electricity Press table UCBetween ground wire；The different break-makes combination of the microprocessor control relay group, realizes transmission line of electricity different parameters Measurement function.
The original state of the relay J1-J9 and relay J13 are off-state, and the relay J10-J12's is first Beginning state is ground state.
A kind of measuring method of transmission line parameter, including method for measuring zero sequence impedance parameters, positive sequence impedance parameter measurement Method, zero sequence capacitance parameter measuring method and positive sequence capacitance parameter measuring method, wherein：
The method for measuring zero sequence impedance parameters comprises the following steps：
Step 1, microprocessor control relay J1, relay J2, relay J3 and relay J13 actions, go to closure State, other relays keep original state；
Step 2, measurement test current Is, test voltage Us, by calculate obtain reactive power that single phase poaer supply exports and Active power；
Step 3, by calculate can obtain zero-sequence reactance, zero sequence resistance and zero sequence impedance：
Step 4, by all relay recovery original states；
The positive sequence impedance measurement method of parameters, comprises the following steps：
Step 1, microprocessor control relay J1, relay J5, relay J10 actions, other relays keep initial State；Single phase poaer supply AB phases are pressurizeed it is through-flow, measurement test current, active power, reactive power, obtain loop AB reactance value And resistance value, then relay J1, relay J5, relay J10 restPose；
Step 2, microprocessor control relay J2, relay J6, relay J11 actions, other relays keep initial State；BC phases are pressurizeed through-flow, obtain loop BC reactance value and resistance value, then relay J2, relay J6, relay J11 restPoses；
Step 3, microprocessor control relay J3, relay J4, relay J12 actions, other relays keep initial State；CA phases are pressurizeed through-flow, obtain loop CA reactance value and resistance value, then relay J3, relay J4, relay J12 restPoses；
Step 4, according to obtained three reactance values are measured above, obtain three single-phase reactance values；
Step 5, according to obtained three resistance values are measured above, obtain three single-phase electricity resistances
Step 6, obtain three-phase line forward-sequence reactance, positive sequence resistance and positive sequence impedance；
The zero sequence capacitance parameter measuring method, comprises the following steps：
Step 1, microprocessor control relay J1, relay J2, relay J3, relay J13 actions, other relays Keep original state.
Step 2, measurement test current Is, test voltage Us, zero sequence electric capacity, zero sequence power frequency electric can be obtained by calculating Receive；
Step 3, by all relay recovery original states；
The positive sequence capacitance parameter measuring method, comprises the following steps：
Step 1, microprocessor control relay J1, relay J8, relay J9, relay J13 actions, other relays Keep original state；A phases are pressurizeed through-flow, measurement test voltage UAWith test current IA、IB、IC, the equivalent capacitance of A phases is obtained, Then relay J1, relay J8, relay J9, relay J13 are restPosed；
Step 2, microprocessor control relay J2, relay J7, relay J9, relay J13 actions, other relays Keep original state；Pressurize cocurrent flow to B phases, obtains the equivalent capacitance of B phases, then by relay J2, relay J7, relay J9, relay J13 restPose；
Step 3, microprocessor control relay J3, relay J7, relay J8, relay J13 actions, other relays Keep original state；Pressurize cocurrent flow to C phases, obtains the equivalent capacitance of C phases, then by relay J3, relay J7, relay J8, relay J13 restPose；
Step 4, according to above step and according to the symmetry of capacitive coupling obtain AB phases electric capacity, BC phases electric capacity and CA phases electricity Hold；
Step 5, calculating obtain positive sequence electric capacity.
Advantages and positive effects of the present invention are：
The present invention is reasonable in design, and it using single phase poaer supply and completes three-phase power transmission by the action of microprocessor control relay The parameter measurement function of circuit, so that the volume and weight of experiment power supply is reduced into original 1/3rd, facilitates equipment Transport and onsite moving, and be automatically performed test connection, improve the reliability and operating efficiency of field test.
Brief description of the drawings
Fig. 1 is the system connection diagram of the present invention；
Fig. 2 is the measurement wiring of zero sequence impedance
Fig. 3 is the measurement wiring of positive sequence impedance (by taking AB phases as an example)
Fig. 4 is the measurement wiring of zero sequence electric capacity
Fig. 5 is the measurement wiring of positive sequence electric capacity (by taking A phases as an example).
Embodiment
The embodiment of the present invention is further described below in conjunction with accompanying drawing：
A kind of measuring system of transmission line parameter, as shown in figure 1, including single phase poaer supply, relay group (J1-J13), electricity Flow table (IA、IB、IC, Is), voltmeter (UA、UB、UC, Us) and microprocessor.The relay group is connected with microprocessor, micro- Processor can realize that the different break-makes combination selection single phase poaer supply of microprocessor control relay group is defeated using single-chip microcomputer or DSP Go out channel function, realize the measurement of different parameters.The specific connected mode of the measuring system is：
The ammeter IA、IB、ICIt is connected to the current value for being respectively used to measure A phase, B phase, C phase circuit in three-phase circuit； The voltmeter UA、UB、UCIt is connected to the magnitude of voltage for being respectively used to measure A phase, B phase, C phase circuit in three-phase circuit；Relay J1, J2, J3 are connected in A phase, B phase, C phase circuit；The ammeter Is is connected to relay J1, J2, J3 and single-phase electricity To measure the output current of single phase poaer supply between source, the single phase poaer supply other end is connected to A phases, B by relay J4, J5, J6 In phase, C circuitry phases, the two ends that the voltmeter Us is arranged on single phase poaer supply are used to measure single phase poaer supply output voltage values, the electricity Pressure table is grounded by relay J13.A phase, B phase, C phase circuit is grounded by relay J7, J8, J9, voltmeter UA、UB、UCPass through Relay J10, J11, J12 are grounded.
This measuring system can measure following transmission line parameter：Zero sequence impedance, positive sequence impedance, zero sequence electric capacity, positive sequence electricity Hold four parameters, different test connections are realized by control relay action, and joined accordingly by measurement and calculating Numerical value.The action of relay and break-make order are controlled by single-chip microcomputer or DSP, and whole test process is all automatically performed, without hand Dynamic change test connection.
The measuring method of the present invention is combined by microprocessor control relay J1-J13 different break-makes, is realized different The measurement function of parameter, including zero sequence impedance, positive sequence impedance, zero sequence electric capacity, the measuring method of four parameters of positive sequence electric capacity, specifically Method includes：
1st, method for measuring zero sequence impedance parameters, as shown in Fig. 2 comprising the following steps：
Step 1, microprocessor control relay J1, J2, J3, J13 action, go to closure state, other relays are kept Original state.
Before measuring, relay J1-J9, J13 original state is off-state, and J10-J12 original state is ground connection State.
Step 2, measurement test current Is, test voltage Us, by calculate can obtain reactive power Q that power supply exports and Active-power P.
Step 3, by calculate can obtain：
Zero-sequence reactance X0=3Q/Is2, zero sequence resistance R0=3P/Is2；
And zero sequence impedance expression formula Z0=R0+jX0。
After step 4, measurement are finished, all relay recovery original states.
2nd, positive sequence impedance measurement method of parameters, as shown in figure 3, so that circuit AB phases are measured as an example, comprising the following steps：
Step 1, microprocessor control relay J1, J5, J10 action, other relays keep original state.Single phase poaer supply AB phases are pressurizeed through-flow, measurement test current IAB, active-power PAB, reactive power QAB, can obtain
Loop AB reactance value：XAB=XA+XB=QAB/IAB 2,
Loop AB resistance value：RAB=RA+RB=PAB/IAB 2；
After finishing, relay J1, J5, J10 restPose.
Step 2, microprocessor control relay J2, J6, J11 action, other relays keep original state.BC is added Pressure is through-flow, can equally obtain
Loop BC reactance value and resistance value：XBC=XB+XC=QBC/IBC 2, RBC=RB+RC=PBC/IBC 2；
After finishing, relay J2, J6, J11 restPose.
Step 3, microprocessor control relay J3, J4, J12 action, other relays keep original state.CA is added Pressure is through-flow, can equally obtain
Loop CA reactance value and resistance value：XCA=XC+XA=QCA/ICA 2, RCA=RC+RA=PCA/ICA 2；
After finishing, relay J3, J4, J12 restPose.
Step 4, according to obtained three reactance values are measured above, can solve equation and obtain three single-phase reactance value XA、XB、 XC,
XA=(XAB+XCA- XBC)/2；
XB=(XAB+XBC- XCA)/2；
XC=(XBC+XCA- XAB)/2。
Step 5, according to obtained three resistance values are measured above, can solve equation and obtain three single-phase electricity resistance RA、RB、 RC,
RA=(RAB+RCA- RBC)/2；
RB=(RAB+RBC- RCA)/2；
RC=(RBC+RCA- RAB)/2。
Step 6, obtain three-phase line forward-sequence reactance and positive sequence resistance
X=(XA+XB+XC)/3, R=(RA+RB+RC)/3；
And positive sequence impedance expression formula Z=R+jX.
3rd, zero sequence capacitance parameter measuring method, as shown in figure 4, comprising the following steps：
Step 1, microprocessor control relay J1, J2, J3, J13 action, other relays keep original state.
Step 2, measurement test current Is, test voltage Us, can be obtained by calculating
Zero sequence electric capacity C0=Is/ (6 π fUs), zero sequence power frequency susceptance Y0=2 π f0C0, wherein, f is test frequency, f0= 50Hz。
After step 3, measurement are finished, all relay recovery original states.
4th, positive sequence capacitance parameter measuring method, as shown in figure 5, so that circuit A phases are measured as an example, comprising the following steps：
Step 1, microprocessor control relay J1, J8, J9, J13 action, other relays keep original state.To A phases Pressurization is through-flow, measurement test voltage UAWith test current IA、IB、IC, can obtain
The equivalent capacitance of A phases：CA=CA0+CA-B+CA-C=IA/(2πfUA),
Wherein, CA0For A relatively electric capacity, f is test frequency,
CA-BFor the electric capacity between A phases and B phases, CA-B=IB/(2πfUA),
CA-CFor the electric capacity between A phases and C phases, CA-C=IC/(2πfUA)。
After finishing, relay J1, J8, J9, J13 restPose.
Step 2, microprocessor control relay J2, J7, J9, J13 action, other relays keep original state.To B phases Pressurize cocurrent flow, can equally obtain
The equivalent capacitance of B phases：CB=CB0+CB-A+CB-C=IB/(2πfUB),
Wherein, CB-A=IA/(2πfUB), CB-C=IC/(2πfUB),
After finishing, relay J2, J7, J9, J13 restPose.
Step 3, microprocessor control relay J3, J7, J8, J13 action, other relays keep original state.To C phases Pressurize cocurrent flow, can equally obtain
The equivalent capacitance of C phases：CC=CC0+CC-A+CC-B=IC/(2πfUC),
Wherein, CC-A=IA/(2πfUC), CC-B=IB/(2πfUC),
After finishing, relay J3, J7, J8, J13 restPose.
Step 4, C can be obtained according to above stepA0、CA-B、CA-C；CB0、CB-A、CB-C；CC0、CC-A、CC-B；
According to the symmetry of capacitive coupling, it can obtain
CAB=(CA-B+CB-A)/2,
CBC=(CB-C+CC-B)/2,
CCA=(CC-A+CA-C)/2。
Step 5, the expression formula for obtaining positive sequence electric capacity
C=(CA0+CB0+CC0)/3+(CAB+CBC+CCA),
And positive sequence power frequency susceptance Y=2 π f0C, wherein f0=50Hz.
It is emphasized that embodiment of the present invention is illustrative, rather than it is limited, therefore present invention bag Include and be not limited to embodiment described in embodiment, it is every by those skilled in the art's technique according to the invention scheme The other embodiment drawn, also belongs to the scope of protection of the invention.

Claims (3)

1. a kind of measuring system of transmission line parameter, it is characterised in that：Including single phase poaer supply, relay group, four ammeters, Four voltmeters and microprocessor；Ammeter IA, ammeter IB, ammeter ICIt is connected in three-phase circuit and is respectively used to measurement three The current value of circuitry phase；Voltmeter UA, voltmeter UB, voltmeter UCIt is connected in three-phase circuit and is respectively used to measure three-phase circuit Magnitude of voltage；Relay J1, relay J2, relay J3 are connected in three-phase circuit；The ammeter Is be connected to after To measure the output current of single phase poaer supply between electrical equipment J1, relay J2, relay J3 and single phase poaer supply, single phase poaer supply is another End is connected on three-phase circuit by relay J4, relay J5, relay J6, and the voltmeter Us is arranged on single-phase electricity The two ends in source are used to measure single phase poaer supply output voltage values, and voltmeter Us is grounded by relay J13；Relay J7, relay Device J8, relay J9 are connected between three-phase circuit and ground wire respectively, and relay J10, J11, J12 are connected to voltmeter UA、 Voltmeter UB, voltmeter UCBetween ground wire；The different break-makes combination of the microprocessor control relay group, realizes power transmission line The measurement function of road different parameters.
2. a kind of measuring system of transmission line parameter according to claim, it is characterised in that：The relay J1-J9 and Relay J13 original state is off-state, and the original state of the relay J10-J12 is ground state.
3. a kind of measuring method of the measuring system of transmission line parameter as claimed in claim 1 or 2, it is characterised in that：Including Method for measuring zero sequence impedance parameters, positive sequence impedance measurement method of parameters, zero sequence capacitance parameter measuring method and positive sequence capacitance parameter Measuring method, wherein：
The method for measuring zero sequence impedance parameters comprises the following steps：
Step 1, microprocessor control relay J1, relay J2, relay J3 and relay J13 actions, go to closure state, Other relays keep original state；
Step 2, measurement test current Is, test voltage Us, reactive power that single phase poaer supply exports is obtained and active by calculating Power；
Step 3, by calculate can obtain zero-sequence reactance, zero sequence resistance and zero sequence impedance：
Step 4, by all relay recovery original states；
The positive sequence impedance measurement method of parameters, comprises the following steps：
Step 1, microprocessor control relay J1, relay J5, relay J10 actions, other relays keep original state； Single phase poaer supply AB phases are pressurizeed it is through-flow, measurement test current, active power, reactive power, obtain loop AB reactance value and electricity Resistance, then relay J1, relay J5, relay J10 restPose；
Step 2, microprocessor control relay J2, relay J6, relay J11 actions, other relays keep original state； BC phases are pressurizeed through-flow, obtain loop BC reactance value and resistance value, then relay J2, relay J6, relay J11 recover Original state；
Step 3, microprocessor control relay J3, relay J4, relay J12 actions, other relays keep original state； CA phases are pressurizeed through-flow, obtain loop CA reactance value and resistance value, then relay J3, relay J4, relay J12 recover Original state；
Step 4, according to obtained three reactance values are measured above, obtain three single-phase reactance values；
Step 5, according to obtained three resistance values are measured above, obtain three single-phase electricity resistances
Step 6, obtain three-phase line forward-sequence reactance, positive sequence resistance and positive sequence impedance；
The zero sequence capacitance parameter measuring method, comprises the following steps：
Step 1, microprocessor control relay J1, relay J2, relay J3, relay J13 actions, other relays are kept Original state.
Step 2, measurement test current Is, test voltage Us, zero sequence electric capacity, zero sequence power frequency susceptance can be obtained by calculating；
Step 3, by all relay recovery original states；
The positive sequence capacitance parameter measuring method, comprises the following steps：
Step 1, microprocessor control relay J1, relay J8, relay J9, relay J13 actions, other relays are kept Original state；A phases are pressurizeed through-flow, measurement test voltage UAWith test current IA、IB、IC, the equivalent capacitance of A phases is obtained, then Relay J1, relay J8, relay J9, relay J13 are restPosed；
Step 2, microprocessor control relay J2, relay J7, relay J9, relay J13 actions, other relays are kept Original state；Pressurize cocurrent flow to B phases, obtains the equivalent capacitance of B phases, then by relay J2, relay J7, relay J9, after Electrical equipment J13 restPoses；
Step 3, microprocessor control relay J3, relay J7, relay J8, relay J13 actions, other relays are kept Original state；Pressurize cocurrent flow to C phases, obtains the equivalent capacitance of C phases, then by relay J3, relay J7, relay J8, after Electrical equipment J13 restPoses；
Step 4, according to above step and AB phases electric capacity, BC phases electric capacity and CA phase electric capacity are obtained according to the symmetry of capacitive coupling；
Step 5, calculating obtain positive sequence electric capacity.
CN201710332193.4A 2017-05-12 2017-05-12 The measuring system and method for a kind of transmission line parameter Pending CN106980070A (en)

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Application publication date: 20170725