CN202256653U - Overhead line type fault indicator performance test device - Google Patents

Abstract

The utility model discloses an overhead line type fault indicator performance test device, which belongs to the technical field of fault indicator testing. The overhead line type fault indicator performance test device is structurally characterized in that a tester is respectively connected with a rise coil and a booster, an oscillograph is respectively connected with a voltage transformer and a current transformer, the booster is connected with the voltage transformer through an insulated cable and a current transformer is assembled together with the rise coil. The tester, the rise coil, the booster and the insulated cable form an overhead line simulation device. A fault indicator is installed on the rise coil, and the booster and the voltage transformer are connected with the ground. The overhead line simulation device is utilized to simulate various conditions of overhead lines, and functional and electrical performance of the fault indicator is detected based on related data recorded by the oscillograph. The overhead line type fault indicator performance test device has the advantages of improving testing accuracy and testing efficiency and being capable of providing strong support for developing novel fault indicators.

Description

A kind of test unit of built on stilts line style fault detector performance

Technical field

The utility model belongs to the fault detector technical field of measurement and test, particularly a kind of test unit of built on stilts line style fault detector performance.

Background technology

Fault detector generally is installed in the electric system distribution line, is used to indicate the path of fault current circulation, thereby realizes localization of fault.

Characteristics such as that fault detector has is cheap, easy for installation, operation maintenance is simple, power distribution network is applied in China.

At present, for built on stilts line style fault detector function and electrical performance test, also there are not the perfect checkout equipment and the detection method of science.

The utility model content

The utility model discloses a kind of test unit of built on stilts line style fault detector performance to above-mentioned defective; Its structure is following: tester connects up-flow coil and stepup transformer respectively; Oscillograph connects the voltage transformer (VT) summation current transformer respectively; Stepup transformer is connected with voltage transformer (VT) through insulated cable, and current transformer and up-flow coil are assembled together, and tester, up-flow coil, stepup transformer and insulated cable have constituted the overhead transmission line analog machine; Fault detector is installed on the up-flow coil, stepup transformer and voltage transformer (VT) ground connection.

The structure of said tester is following: microsystem connects D/A conversion circuit through pci bus, and power amplification circuit connects D/A conversion circuit, and high-power DC power supply connects D/A conversion circuit and power amplification circuit respectively.

The major function of tester be according to set test experiments condition (as State Grid Corporation of China in 2010 the promulgation " distribution line failure indicator techniques standard "---Q/GDW436-2010); Produce certain test voltage, current signal and come the detection failure indicator; Thereby reach the logic function of detection failure indicator and the purpose of acting characteristic, and test result is demarcated and estimated according to respective standard.

The no-load voltage ratio of said stepup transformer is 1: 100, and capacity is 30VA.

Said up-flow coil is the enameled wire coiled of 2.5mm by diameter, and its number of turn is 50, and circuit time constant is less than 100 microseconds.

The no-load voltage ratio of said voltage transformer (VT) is 10000: 100, and standard accuracy level is 0.5 grade.

The no-load voltage ratio of said current transformer is 1000: 5, and precision is 0.2 grade.

The scope of the input voltage of said oscillograph is 0～100V, and the scope of input current is 0～5A, and measuring accuracy is ± 0.1%, and time delay is in 10 μ s.

The beneficial effect of the utility model is:

1) the various running statuses of hookup can be set: normal operation, short trouble, earth fault etc., and duration of each state can accurately be set, thus can accomplish function and electrical performance test, measuring accuracy is higher.

2) fault simulation and data recording are accomplished automatically, have improved test efficiency.

3) the fault amount can be set to power frequency 50Hz, each harmonic content and each amount damping time constant; Thereby real simulation distribution line running status more; And then can accomplish technical manual---the pilot project beyond the Q/GDW 436-2010 defined provides powerful support for for the development of new fault detector provides.

Description of drawings

Fig. 1 is the hookup schematic diagram;

Fig. 2 is the tester hardware structure diagram;

Fig. 3 a is a short trouble indication test current waveform;

Fig. 3 b is a short trouble indication trial voltage waveform;

Fig. 4 a is a singlephase earth fault indication test current waveform;

Fig. 4 b is a singlephase earth fault indication trial voltage waveform.

Embodiment

Below in conjunction with accompanying drawing to the utility model further explain:

As shown in Figure 1; The structure of the utility model is following: tester connects up-flow coil and stepup transformer respectively, and oscillograph connects the voltage transformer (VT) summation current transformer respectively, and stepup transformer is connected with voltage transformer (VT) through insulated cable; Current transformer and up-flow coil are assembled together; Tester, up-flow coil, stepup transformer and insulated cable have constituted the overhead transmission line analog machine, and fault detector is installed on the up-flow coil, stepup transformer and voltage transformer (VT) ground connection.

In test unit, the no-load voltage ratio of stepup transformer is 1: 100, and capacity is 30VA.The up-flow coil is the enameled wire coiled of 2.5mm by diameter, and its number of turn is 50, and circuit time constant is less than 100 microseconds.The no-load voltage ratio of voltage transformer (VT) is 10000: 100, and standard accuracy level is 0.5 grade.The no-load voltage ratio of current transformer is 1000: 5, and precision is 0.2 grade.The scope of the input voltage of oscillograph is 0～100V, and the scope of input current is 0～5A, and measuring accuracy is ± 0.1%, and time delay is in 10 μ s.Microsystem is equipped with Window operating system and special-purpose TT&C software.

As shown in Figure 2, the structure of tester is following: microsystem connects D/A conversion circuit through pci bus, and power amplification circuit connects D/A conversion circuit, and high-power DC power supply connects D/A conversion circuit and power amplification circuit respectively.

Tester is used for the various running statuses of analog ligand electric line; Can export three-phase voltage (0～100V), three-phase current (0～30A); In order to guarantee higher measuring accuracy, require the precision of output voltage and output current to reach ± 0.1%, degree of distortion THD≤0.5%.

The major function of tester be according to set test experiments condition (as State Grid Corporation of China in 2010 the promulgation " distribution line failure indicator techniques standard "---Q/GDW436-2010); Produce certain test voltage, current signal and come the detection failure indicator; Thereby reach the logic function of detection failure indicator and the purpose of acting characteristic, and test result is demarcated and estimated according to respective standard.

The workflow of the utility model is following: microsystem is provided with the parameter of output voltage and output current through its special-purpose TT&C software; D/A conversion circuit converts the binary digital signal of microsystem output into simulating signal; Power amplification circuit carries out power amplification to this simulating signal; Can reach 30A through amplifying after-current, voltage can reach 100V.

Because the tester output voltage is 100V to the maximum, real analog ligand electric line electric pressure, so the employing stepup transformer further raises the tester output voltage signal, its output voltage can reach 10KV.

Because the tester output current is 30A to the maximum, really analog ligand electric line load current and fault current are so employing up-flow coil further improves the tester output current (can be increased to 600A).

The overhead transmission line analog machine is used for simulating normal operating condition, short trouble state, tripped condition, reclosing state and the singlephase earth fault state of overhead transmission line; Insulated cable is used for simulating pole line; Fault detector is measured the electric current of up-flow coil and the voltage of insulated cable; If short trouble state or singlephase earth fault state appear in overhead transmission line; Fault detector sends the indication of reporting to the police; Voltage transformer (VT) with the stepup transformer output voltage in proportion (no-load voltage ratio of voltage transformer (VT)) be transformed to low-voltage; Current transformer with up-flow coil output current in proportion (no-load voltage ratio of current transformer) be transformed to little electric current, oscillograph is used to write down input current waveform and input voltage waveform, is used to read effective value, peak value, frequency and normal operating condition, short trouble state, tripped condition, reclosing state or the ground-fault condition duration of input voltage and input current; Through reading the various data of oscillograph, again with reference to the fault detector test specification (State Grid Corporation of China was in promulgation distribution line failure indicator techniques standard in 2010---Q/GDW436-2010), i.e. the performance of detectable failure indicator.

High-power DC power supply is for D/A conversion circuit and power amplification circuit working power to be provided.

Embodiment one: short trouble indication test

Fault detector parameter declaration: rated voltage U _n=6700V (phase voltage), load current I _l=50A, frequency of operation f=50Hz, short-circuit current definite value I _x=400A can discern short trouble alarm current minimum length in time T _x=40 milliseconds, minimum recognition time (tripped condition duration) T of reclosing _Ch=200 milliseconds.(all the other specific targets are consulted State Grid Corporation of China in promulgation distribution line failure indicator techniques standard in 2010---Q/GDW 436-2010)

Tester is exported following four kinds of states:

1) normal operating condition:

Output voltage

Initial angle θ _u=0; Frequency f=50Hz;

Output current Initial angle θ _i=-30 °, frequency f=50Hz;

Duration T ₁=10 minutes.

2) short trouble state:

Output voltage

Initial angle θ _u=0 °, frequency f=50Hz;

Output current

Initial angle θ _i=-70 °, frequency f=50Hz;

Duration T ₂=T _x

In the short trouble state, suppose that the fault phase voltage reduces to rated voltage 20%.

3) tripped condition:

Output current i _Out=0;

Output voltage u _Out=0;

Duration T ₃=T _Ch

4) reclosing state:

Output voltage

Initial angle θ _u=0, frequency f=50Hz;

Output current

Initial angle θ _i=-30 ° of frequency f=50Hz;

Duration T ₄＞T _x

Be depicted as the input current and the input voltage waveform of oscillograph record like Fig. 3 a, Fig. 3 b.(with the last 150ms of normal operating condition as time zero)

If fault detector sends the indication of reporting to the police, just explain that fault detector has short trouble indication and decision-making function automatically (with reference to distribution line failure indicator techniques standard "---Q/GDW 436-2010 requires)

With reference to the oscillograph data recorded is whether the decidable fault detector satisfies following electric property (requiring with reference to distribution line failure indicator techniques standard-Q/GDW 436-2010): 1) the minimum recognition time of reclosing is 200 milliseconds; 2) fault detector should be able to change according to line load and confirms fault current actuation of an alarm value automatically, and action error be not more than ± 20%; 3) can discern short trouble alarm current minimum length in time at 20 milliseconds～40 milliseconds.

Embodiment two: singlephase earth fault indication test

Fault detector parameter declaration: line voltage distribution U _n=6700V (phase voltage), load current I _l=30A, frequency of operation f=50Hz, earth-fault current definite value Δ I _d=50A can discern earth-fault current duration Δ T _D1=40 milliseconds, phase voltage decline ratio Δ U _d%=30%, phase voltage decline duration Δ T _D2=60 seconds.(all the other specific targets are consulted State Grid Corporation of China in promulgation distribution line failure indicator techniques standard in 2010---Q/GDW 436-2010)

Tester is exported following three kinds of states:

1) normal operating condition:

Output voltage

F=50Hz, θ _u=0;

Output current

F=50Hz, θ _i=-30 °;

Duration T ₁=10 minutes.

2) ground-fault condition 1:

Output current $i_{\mathrm{Out}}=\sqrt{2}{I}_l\mathrm{Sin}(2\mathrm{\π\; f}+{\mathrm{\θ}}_i)+1.2\sqrt{2}\×\mathrm{\Δ}{I}_d\mathrm{Sin}(2\mathrm{\π}\×5f+{\mathrm{\θ}}_{5i}),$ F=50Hz, θ _i=-30 °, θ _5i=0 °;

Output voltage

T=0～Δ T _D1,

θ _u＝0°，f＝50Hz；

Duration T ₂=Δ T _D1

3) ground-fault condition 2:

Output current $i_{\mathrm{Out}}=\sqrt{2}{I}_l\mathrm{Sin}(2\mathrm{\π\; f}+{\mathrm{\θ}}_i),$

θ _i＝-30°，f＝50Hz；

Output voltage $u_{\mathrm{Out}}=(1-\mathrm{\Δ}{U}_d\%)\×\sqrt{2}{U}_n\mathrm{Sin}(2\mathrm{\π\; f}+{\mathrm{\θ}}_u),$

θ _u＝0°，f＝50Hz；

Duration T ₃>=Δ T _D2

Be depicted as the input current and the input voltage waveform of oscillograph record like Fig. 4 a, Fig. 4 b.

(with the last 125ms of normal operating condition as time zero)

If fault detector sends the indication of reporting to the police, just explain that fault detector has singlephase earth fault deixis (with reference to distribution line failure indicator techniques standard "---Q/GDW436-2010 requires)

With reference to the oscillograph data recorded is whether the decidable fault detector satisfies following electric property (requiring with reference to distribution line failure indicator techniques standard-Q/GDW 436-2010):

1) singlephase earth fault is reported to the police has the eigenwert of quantitative setting, and its action error is not more than ± and 20%;

2) can discern the earth-fault current duration is provided by producer, and its error is not more than ± and 10%.

The above; Be merely the embodiment of two of the utility model; But the protection domain of the utility model is not limited thereto; Any technician who is familiar with the present technique field is in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection domain of the utility model.

Claims (7)

1. the test unit of a built on stilts line style fault detector performance; It is characterized in that; Its structure is following: tester connects up-flow coil and stepup transformer respectively, and oscillograph connects the voltage transformer (VT) summation current transformer respectively, and stepup transformer is connected with voltage transformer (VT) through insulated cable; Current transformer and up-flow coil are assembled together; Tester, up-flow coil, stepup transformer and insulated cable have constituted the overhead transmission line analog machine, and fault detector is installed on the up-flow coil, stepup transformer and voltage transformer (VT) ground connection.

2. the test unit of a kind of built on stilts line style fault detector performance according to claim 1; It is characterized in that; The structure of said tester is following: microsystem connects D/A conversion circuit through pci bus; Power amplification circuit connects D/A conversion circuit, and high-power DC power supply connects D/A conversion circuit and power amplification circuit respectively.

3. the test unit of a kind of built on stilts line style fault detector performance according to claim 1 is characterized in that, the no-load voltage ratio of said stepup transformer is 1: 100, and capacity is 30VA.

4. the test unit of a kind of built on stilts line style fault detector performance according to claim 1 is characterized in that, said up-flow coil is the enameled wire coiled of 2.5mm by diameter, and its number of turn is 50, and circuit time constant is less than 100 microseconds.

5. the test unit of a kind of built on stilts line style fault detector performance according to claim 1 is characterized in that, the no-load voltage ratio of said voltage transformer (VT) is 10000: 100, and standard accuracy level is 0.5 grade.

6. the test unit of a kind of built on stilts line style fault detector performance according to claim 1 is characterized in that, the no-load voltage ratio of said current transformer is 1000: 5, and precision is 0.2 grade.

7. the test unit of a kind of built on stilts line style fault detector performance according to claim 1; It is characterized in that the scope of the input voltage of said oscillograph is 0～100V, the scope of input current is 0～5A; Measuring accuracy is ± 0.1%, and time delay is in 10 μ s.

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