CN103675535A - High-tension transmission line power frequency parameter testing and testing connection switching integrated device - Google Patents

Abstract

The invention discloses a high-voltage transmission line power frequency parameter test and test wiring switching integrated device, including contactor KM1, contactor KM2, contactor KM3, different frequency power supply, voltage transformer PT1, voltage transformer PT2, voltage transformer PT3, current transformer CT1, current transformer CT2 and current transformer CT3, one end of the induction coil of the voltage transformer PT1, voltage transformer PT2 and voltage transformer PT3 is respectively connected to the three-phase power supply A phase, B phase and On phase C, the other end of which is grounded, the current transformer CT1, current transformer CT2 and current transformer CT3 are arranged on phase A, phase B and phase C of the three-phase power supply, and the voltage transformer PT1, voltage transformer The output terminals of PT2, voltage transformer PT3, current transformer CT1, current transformer CT2 and current transformer CT3 are connected to the input terminal of the acquisition circuit, and the output terminal of the acquisition circuit is connected to the host computer. To achieve the purpose of ensuring safety and automatically switching wiring.

Description

High-voltage transmission line power frequency parameter test and test wiring switching integrated device

technical field

The invention relates to the field of high-voltage measuring equipment, in particular to an integrated device for testing power frequency parameters of high-voltage transmission lines and switching test wiring.

Background technique

At present, with the rapid development of the power grid, there are more and more new high-voltage transmission lines. Before the new lines are put into operation, various power frequency parameter values need to be measured, which can be used as calculation system short-circuit current, relay protection setting, calculation of power flow distribution and The basis for selecting the operation method, etc. The test items involved in the power frequency parameter test of transmission lines mainly include DC resistance measurement, positive sequence impedance measurement, positive sequence admittance measurement, zero sequence impedance measurement and zero sequence admittance measurement, etc. Depending on the test items, different wiring methods are required. At present, at the test site, testers need to manually change the wiring, which not only reduces the test efficiency, but also cannot guarantee the tester's operation safety.

Contents of the invention

The object of the present invention is to solve the above problems and propose an integrated device for testing the power frequency parameters of high-voltage transmission lines and switching wiring for testing, so as to realize the advantages of ensuring safety and automatically switching wiring.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A high-voltage transmission line power frequency parameter test and test wiring switching integrated device, including contactor KM1, contactor KM2, contactor KM3, different frequency power supply, voltage transformer PT1, voltage transformer PT2, voltage transformer PT3, current Transformer CT1, current transformer CT2 and current transformer CT3, the incoming line of the contactor KM1 is connected to A, B and C of the down-conductor of the transmission line under test, and the outgoing line of the contactor KM1 is connected to the contactor KM2 The incoming line of the contactor KM2 is connected together; one of the outgoing lines of the contactor KM1 is connected to the output terminal a of the different frequency power supply, and the other two outgoing lines of the contactor KM1 are connected to the incoming line of the contactor KM3, and the contactor KM3 The outgoing lines are respectively connected to the output terminal b and output terminal c of the different frequency power supply,

One end of the induction coil of the voltage transformer PT1, the voltage transformer PT2 and the voltage transformer PT3 is respectively connected to the A phase, the B phase and the C phase of the three-phase power supply, and the other end is grounded. The transformer CT2 and the current transformer CT3 are arranged on the A phase, the B phase and the C phase of the three-phase power supply, and the voltage transformer PT1, the voltage transformer PT2, the voltage transformer PT3, the current transformer CT1, the current transformer CT2 and the current The output end of the transformer CT3 is connected with the input end of the acquisition circuit, and the output end of the acquisition circuit is connected with the upper computer.

Further, it also includes an operation panel, on which the jacks for connecting the A phase, B phase and C phase of the down conductor of the transmission line under test are correspondingly set, and the output terminal a, the output terminal b and the output terminal of the different frequency power supply are connected. The jack at terminal c, the insulation/DC resistance measurement button and indicator light, the positive sequence impedance/admittance measurement button and indicator light, and the zero sequence impedance/admittance measurement button and indicator light.

Further, the insulation/DC resistance measurement button, the positive sequence impedance/admittance measurement button and the zero sequence impedance/admittance measurement button are arranged in parallel on the operation panel.

Further, the set insulation/DC resistance measurement button and indicator light are pressed during insulation resistance and DC resistance measurement. When the button is pressed, the indicator light above it is on, indicating that the insulation resistance and DC resistance are currently being measured. ;

The set positive sequence impedance/admittance measurement button and indicator light are pressed during positive sequence impedance measurement and positive sequence admittance measurement. When the button is pressed, the indicator light above it is on, indicating that the positive sequence impedance is currently being tested and positive-sequence admittance;

The set zero-sequence impedance/admittance measurement button and indicator light are pressed during zero-sequence impedance measurement and zero-sequence admittance measurement. When the button is pressed, the indicator light above it is on, indicating that the zero-sequence Impedance and zero sequence admittance.

The technical solution of the present invention has the following beneficial effects:

According to the technical solution of the present invention, by setting the contactor KM1, the contactor KM2 and the contactor KM3, and through the actions of the contactor KM1, the contactor KM2 and the contactor KM3, the automatic switching of the test wiring is realized, thereby avoiding the problem caused by manual change of the wiring. safety issues, so as to achieve the purpose of ensuring safety and automatically switching wiring.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

1 is an electrical circuit diagram of an integrated device for testing high-voltage transmission line power frequency parameters and switching test wiring according to an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of an operation panel of an integrated device for testing high-voltage transmission line power frequency parameters and switching test wiring according to an embodiment of the present invention.

In conjunction with the accompanying drawings, the reference signs in the embodiments of the present invention are as follows:

1-Insulation/DC resistance measurement indicator; 2-Positive sequence impedance/admittance measurement indicator; 3-Zero sequence impedance/admittance measurement indicator; 4-Insulation/DC resistance measurement button; 5-Positive sequence impedance/conductance Nano measurement button; 6-Zero sequence impedance/admittance measurement button.

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

As shown in Figure 1, a high-voltage transmission line power frequency parameter test and test wiring switching integrated device, including contactor KM1, contactor KM2, contactor KM3, different frequency power supply, voltage transformer PT1, voltage transformer PT2, Voltage transformer PT3, current transformer CT1, current transformer CT2 and current transformer CT3, the incoming line of contactor KM1 is connected to A, B and C of the down-conductor of the transmission line under test, and the outgoing line of contactor KM1 is connected to To the incoming line of contactor KM2, the outgoing line of contactor KM2 is connected together; one of the outgoing lines of contactor KM1 is connected to the output terminal a of the different frequency power supply, and the other two outgoing lines of contactor KM1 are connected to the incoming line of contactor KM3 , the outgoing lines of the contactor KM3 are respectively connected to the output terminal b and output terminal c of the different frequency power supply,

One end of the induction coil of voltage transformer PT1, voltage transformer PT2 and voltage transformer PT3 is respectively connected to phase A, phase B and phase C of the three-phase power supply, and the other end is grounded. Current transformer CT1, current transformer CT2 and current transformer The transformer CT3 is set on the A phase, B phase and C phase of the three-phase power supply, and the output terminals of the voltage transformer PT1, voltage transformer PT2, voltage transformer PT3, current transformer CT1, current transformer CT2 and current transformer CT3 It is connected with the input end of the acquisition circuit, and the output end of the acquisition circuit is connected with the upper computer.

As shown in Figure 2, the casing of the device is provided with an operation panel, and the operation panel is correspondingly provided with jacks for connecting phase A, phase B and phase C of the down-conductor of the transmission line under test, as well as connecting the output of the different frequency power supply Jacks of terminal a, output terminal b and output terminal c, insulation/DC resistance measurement button and indicator light, positive sequence impedance/admittance measurement button and indicator light, and zero sequence impedance/admittance measurement button and indicator light.

The insulation/DC resistance measurement button, the positive-sequence impedance/admittance measurement button and the zero-sequence impedance/admittance measurement button are arranged in parallel on the operation panel, and their corresponding indicator lights are arranged in parallel below them. The set insulation/DC resistance measurement button and indicator light are pressed during insulation resistance and DC resistance measurement. When the button is pressed, the indicator light above it is on, indicating that the insulation resistance and DC resistance are currently being measured; the set Positive-sequence impedance/admittance measurement button and indicator light, press it during positive-sequence impedance measurement and positive-sequence admittance measurement, when the button is pressed, the indicator light above it is on, indicating that the current positive-sequence impedance and positive-sequence Admittance; the set zero-sequence impedance/admittance measurement button and indicator light are pressed during zero-sequence impedance measurement and zero-sequence admittance measurement. When the button is pressed, the indicator light above it is on, indicating that the current Test zero sequence impedance and zero sequence admittance.

The voltage transformers PT1, PT2, PT3 in the parameter test part are connected between A, B, C and ground, the current transformers CT1, CT2, CT3 are connected to A, B, C, and the output of the two is connected to the voltage current The acquisition circuit is connected with the upper computer. The acquisition board collects the required voltage and current, and realizes the measurement of parameters such as positive sequence impedance, positive sequence admittance, zero sequence impedance, and zero sequence admittance through the calculation model of power frequency parameters of the transmission line. And it is integrated with the wiring automatic switching part to form an integrated device.

The A, B, C jacks on the operation panel are connected to the down conductors of the line, and the a, b, and c jacks are connected to the different frequency power output. The G jack is connected to the ground terminal. The set insulation/DC resistance measurement button and indicator light are pressed during insulation resistance and DC resistance measurement. When the button is pressed, the indicator light above it is on, indicating the current test item; the set positive sequence impedance/ The admittance measurement button and indicator light are pressed during positive sequence impedance measurement and positive sequence admittance measurement. When the button is pressed, the indicator light above it is on, indicating the current test item; the set zero sequence impedance/conductance The nanometer measurement button and indicator light are pressed during zero-sequence impedance measurement and zero-sequence admittance measurement. When the button is pressed, the indicator light above it lights up, indicating the current test item.

The different-frequency power supply is used to generate the AC voltage and current signals required for the test and add them to the test circuit.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. a ultra-high-tension power transmission line power frequency parameter test switches integrated apparatus with test wiring, it is characterized in that, comprise contactor KM1, contactor KM2, contactor KM3, alien frequencies power supply, voltage transformer pt 1, voltage transformer pt 2, voltage transformer pt 3, Current Transmit 1, Current Transmit 2 summation current transformer CT3, the inlet wire of described contactor KM1 is connected with A, B and the C of the downlead of tested transmission line of electricity, the outlet of contactor KM1 is connected to the inlet wire of contactor KM2, and the outlet of contactor KM2 is connected together; One of them outlet of contactor KM1 is connected to the output terminal a of alien frequencies power supply, and other two outlets of contactor KM1 are connected to the inlet wire of contactor KM3, and the outlet of contactor KM3 is connected to respectively output terminal b and the output terminal c of alien frequencies power supply,

Inductive coil one end of described voltage transformer pt 1, voltage transformer pt 2 and voltage transformer pt 3 is connected on respectively three-phase supply A phase, B phase and C and goes up mutually, its other end ground connection, described Current Transmit 1, Current Transmit 2 summation current transformer CT3 are arranged on three-phase supply A phase, B phase and C and go up mutually, described voltage transformer pt 1, voltage transformer pt 2, voltage transformer pt 3, Current Transmit 1, Current Transmit 2 output terminals of summation current transformer CT3 and the input end of Acquisition Circuit are connected, and the output terminal of this Acquisition Circuit is connected with host computer.

2. ultra-high-tension power transmission line power frequency parameter test according to claim 1 switches integrated apparatus with test wiring, it is characterized in that, also comprise guidance panel, on this guidance panel, relative set connects the jack of A phase, B phase and the C phase of the downlead of tested transmission line of electricity, and the jack that connects alien frequencies power output end a, output terminal b and output terminal c, insulation/direct current resistance m easurem ent button and pilot lamp, positive sequence impedance/admittance measurement button and pilot lamp and zero sequence impedance/admittance measurement button and pilot lamp.

3. ultra-high-tension power transmission line power frequency parameter test according to claim 2 switches integrated apparatus with test wiring, it is characterized in that described insulation/direct current resistance m easurem ent button, positive sequence impedance/admittance measurement button and parallel being arranged on guidance panel of zero sequence impedance/admittance measurement button.

4. according to the ultra-high-tension power transmission line power frequency parameter test described in claim 2 or 3 and test wiring, switch integrated apparatus, it is characterized in that, insulation/direct current resistance m easurem ent the button and the pilot lamp that arrange, when insulation resistance and direct current resistance m easurem ent, press, when pressing this button, the pilot lamp that is arranged at its top is bright, indicates current at measurement insulation resistance and direct current resistance;

Positive sequence impedance/admittance measurement the button and the pilot lamp that arrange are pressed when positive sequence impedance measurement and positive sequence admittance measurement, and when pressing this button, the pilot lamp that is arranged at its top is bright, indicate current in test positive sequence impedance and positive sequence admittance;

Zero sequence impedance/admittance measurement the button and the pilot lamp that arrange are pressed when zero sequence impedance measurement and zero sequence admittance measurement, and when pressing this button, the pilot lamp that is arranged at its top is bright, indicate current in test zero sequence impedance and zero sequence admittance.

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