Non-contact high-voltage line parameter testing device

Abstract

The invention discloses a non-contact high-voltage line parameter testing device, which is characterized in that a high-voltage testing unit is in three-phase connection with an opposite-end matching unit, the high-voltage testing unit and the opposite-end matching unit are both connected with a data transmission unit, and the data transmission unit is in wireless connection with a terminal; the high-voltage relay comprises a current measuring unit, a testing device and an induced voltage testing unit; the power transmission line is connected with the first single-pole double-throw switch, one end of the first single-pole double-throw switch is connected with the second single-pole double-throw switch, the other end of the first single-pole double-throw switch is connected with the third single-pole double-throw switch through the current measuring unit, one end of the third single-pole double-throw switch is connected with the testing device, and the other end is grounded. One end of the second single-pole double-throw switch is connected with the insulation resistance measuring unit, and the other end of the second single-pole double-throw switch is connected with the induced voltage testing unit. Therefore, the whole test work can be completed through one-time wiring.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage line testing, and more particularly to a non-contact high-voltage line parameter testing device. Background Art

[0002] At present, before newly built lines of 110kV and above are put into operation, line parameter tests must be carried out as a real basis for relay protection setting, power flow calculation and selection of reasonable operation mode.

[0003] During the line parameter test, insulation resistance, positive-sequence impedance, zero-sequence impedance and other items need to be tested. The process requires reverse wiring operations, which can easily lead to accidents of induced electric shock and pose a high safety risk.

[0004] The publication number is CN201666902U, and the name is high-voltage line parameter test protection device. It discloses a switching switch arranged between the high-voltage line under test and the high-voltage line parameter test device, and the switching switch has input terminals, output terminals and grounding terminals. The switching switch is a three-phase double-throw knife switch, and the input terminals of the switching switch are divided into current input terminals and voltage input terminals, which are connected to the middle terminal of the three-phase double-throw knife switch; the output terminals of the switching switch include current output terminals and voltage output terminals. By adding a protection device between the high-voltage line under test and the high-voltage line parameter test device, in the process of switching the wiring mode, the knife switch is first used to ground the high-voltage line under test, which can effectively eliminate the induced voltage and induced current on the test line, which is used to protect the safety of testers and test equipment.

[0005] The publication number is CN216696502U, and the name is a multifunctional line parameter testing circuit and device, which discloses a high-voltage DC power supply module, an RC step-down network, a resistor voltage divider module and a voltage measurement unit connected in sequence, and also includes a high-voltage relay connected to the resistor voltage divider module and the RC step-down network; the RC step-down network and the resistor voltage divider module can be connected to the transmission line through the high-voltage relay; the high-voltage DC power supply module is used to provide high-voltage DC power, and the RC step-down network is used to attenuate the induced voltage of the transmission line to a preset voltage; the resistor voltage divider module is used to perform resistor voltage division on the induced voltage of the transmission line; and the voltage measurement unit measures the voltage of the induced voltage after the resistor voltage division.

[0006] During the existing line parameter testing process, insulation resistance, positive-sequence impedance, zero-sequence impedance and other items need to be tested. The process requires reverse wiring operations, which is prone to induced electric shock accidents. The safety risk is high, and close communication and cooperation are required at both ends of the test. There are many test items, frequent line changes, and long testing times. Testers and coordinating personnel need to concentrate on communication and testing for a long time. Induced electric damage during testing and line changing is everywhere, and it is very difficult to avoid.

[0007] Therefore, how to provide a device that can complete relevant testing work without contacting the instrument or the test line terminal is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0008] In view of this, the present invention provides a non-contact high-voltage line parameter testing device, aiming to solve the above technical problems.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] A non-contact high-voltage line parameter testing device, comprising: a high-voltage testing unit, a counterpart coordination unit, a data transmission unit and a terminal;

[0011] The high voltage test unit is connected with the opposite end cooperation unit in three phases, the high voltage test unit and the opposite end cooperation unit are both connected with the data transmission unit, and the data transmission unit is wirelessly connected with the terminal;

[0012] The high-voltage test unit and the opposite-end matching unit are high-voltage relays, which include a current measuring unit, a testing device, and an induced voltage testing unit; the transmission line is connected to a first single-pole double-throw switch, one end of the first single-pole double-throw switch is connected to a second single-pole double-throw switch, and the other end is connected to a third single-pole double-throw switch through a current measuring unit, one end of the third single-pole double-throw switch is connected to the testing device, and one end is grounded, one end of the second single-pole double-throw switch is connected to an insulation resistance measuring unit, and the other end is connected to the induced voltage testing unit.

[0013] Further, the first single-pole double-throw switch includes a single-pole double-throw switch S2, a single-pole double-throw switch S5, and a single-pole double-throw switch S7; the second single-pole double-throw switch includes a single-pole double-throw switch S4; and the third single-pole double-throw switch includes a single-pole double-throw switch S3, a single-pole double-throw switch S6, and a single-pole double-throw switch S8.

[0014] Furthermore, the A-phase line is connected to a single-pole double-throw switch S2, one end of the single-pole double-throw switch S2 is connected to a single-pole double-throw switch S3 through a current measuring unit A1, one end of the single-pole double-throw switch S3 is connected to a testing device, and the other end is grounded, the other end of the single-pole double-throw switch S2 is connected to a single-pole double-throw switch S4, one end of the single-pole double-throw switch S4 is connected to an induced voltage testing unit, and the other end is connected to an insulation resistance measuring unit.

[0015] Furthermore, the B-phase line is connected to a single-pole double-throw switch S5, one end of the single-pole double-throw switch S5 is connected to a single-pole double-throw switch S6 through a current measuring unit A2, one end of the single-pole double-throw switch S6 is connected to a testing device, and the other end is grounded, the other end of the single-pole double-throw switch S5 is connected to a single-pole double-throw switch S4, one end of the single-pole double-throw switch S4 is connected to an induced voltage testing unit, and the other end is connected to an insulation resistance measuring unit.

[0016] Furthermore, the C phase line is connected to a single-pole double-throw switch S7, one end of the single-pole double-throw switch S7 is connected to a single-pole double-throw switch S8 through a current measuring unit A3, one end of the single-pole double-throw switch S7 is connected to a testing device, and the other end is grounded, the other end of the single-pole double-throw switch S7 is connected to a single-pole double-throw switch S4, one end of the single-pole double-throw switch S4 is connected to an induced voltage testing unit, and the other end is connected to an insulation resistance measuring unit.

[0017] Furthermore, the induced voltage test unit specifically includes: a resistor R1 and a resistor R2, and one end of the single-pole double-throw switch S4 is grounded through the resistor R1 and the resistor R2.

[0018] Furthermore, the insulation resistance measuring unit specifically includes: a resistor R3, a capacitor C1 and an ohmmeter, the other end of the single-pole double-throw switch S4 is grounded through the resistor R3 and the capacitor C1, and the other end of the single-pole double-throw switch S4 is also grounded through the resistor R3 and the ohmmeter.

[0019] Furthermore, the data transmission unit is a wireless Bluetooth module or a 5G signal module.

[0020] Furthermore, the terminal is a mobile phone APP or a computer.

[0021] Furthermore, the resistor R3 and the capacitor C1 form a voltage-reducing network.

[0022] The above technical solution includes at least the following technical effects:

[0023] It can be known from the above technical scheme that the present invention discloses a non-contact high-voltage line parameter test device. Compared with the prior art, the present invention can realize the grounding and suspension state of the instruments at both ends of the device through the high-voltage relay in accordance with the requirements of the line parameter test wiring, so as to realize the "zero" inverted wiring during the test, thereby achieving a one-time wiring to complete the entire test work. The line is grounded or connected to the test instrument by operating the control signal of the relay, so as to realize the insulation resistance measurement of the corresponding phase lines, and at the same time, the induced voltage measurement of the corresponding phase lines can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of a line parameter medium and high voltage relay of the present invention.

[0026] Figure 2 The present invention is a schematic structural diagram of a high-voltage relay principle diagram.

[0027] Figure 3 It is a schematic diagram of the line parameter test structure of the present invention. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See attached Figure 1-3 , the embodiment of the present invention discloses a non-contact high-voltage line parameter testing device, including: a high-voltage testing unit, a counterpart matching unit, a data transmission unit and a terminal;

[0030] The high voltage test unit is connected to the opposite end cooperation unit in three phases, the high voltage test unit and the opposite end cooperation unit are both connected to the data transmission unit, and the data transmission unit is wirelessly connected to the terminal;

[0031] The high-voltage test unit and the matching unit at the opposite end are high-voltage relays, which include a current measuring unit, a testing device, and an induced voltage testing unit; the transmission line is connected to a first single-pole double-throw switch, one end of the first single-pole double-throw switch is connected to a second single-pole double-throw switch, and the other end is connected to a third single-pole double-throw switch through a current measuring unit, one end of the third single-pole double-throw switch is connected to the testing device, and one end is grounded, one end of the second single-pole double-throw switch is connected to the insulation resistance measuring unit, and the other end is connected to the induced voltage testing unit.

[0032] To further optimize the above technical solution, the first single-pole double-throw switch includes a single-pole double-throw switch S2, a single-pole double-throw switch S5, and a single-pole double-throw switch S7; the second single-pole double-throw switch includes a single-pole double-throw switch S4; and the third single-pole double-throw switch includes a single-pole double-throw switch S3, a single-pole double-throw switch S6, and a single-pole double-throw switch S8.

[0033] To further optimize the above technical solution, the A-phase line is connected to the single-pole double-throw switch S2, one end of the single-pole double-throw switch S2 is connected to the single-pole double-throw switch S3 through the current measuring unit A1, one end of the single-pole double-throw switch S3 is connected to the testing device, and the other end is grounded, the other end of the single-pole double-throw switch S2 is connected to the single-pole double-throw switch S4, one end of the single-pole double-throw switch S4 is connected to the induced voltage testing unit, and the other end is connected to the insulation resistance measuring unit.

[0034] To further optimize the above technical solution, the B-phase line is connected to the single-pole double-throw switch S5, one end of the single-pole double-throw switch S5 is connected to the single-pole double-throw switch S6 through the current measuring unit A2, one end of the single-pole double-throw switch S6 is connected to the testing device, and the other end is grounded, the other end of the single-pole double-throw switch S5 is connected to the single-pole double-throw switch S4, one end of the single-pole double-throw switch S4 is connected to the induced voltage testing unit, and the other end is connected to the insulation resistance measuring unit.

[0035] To further optimize the above technical solution, the C phase line is connected to the single-pole double-throw switch S7, one end of the single-pole double-throw switch S7 is connected to the single-pole double-throw switch S8 through the current measuring unit A3, one end of the single-pole double-throw switch S7 is connected to the testing device, and the other end is grounded, the other end of the single-pole double-throw switch S7 is connected to the single-pole double-throw switch S4, one end of the single-pole double-throw switch S4 is connected to the induced voltage testing unit, and the other end is connected to the insulation resistance measuring unit.

[0036] To further optimize the above technical solution, the induction voltage test unit specifically includes: a resistor R1 and a resistor R2, and one end of the single-pole double-throw switch S4 is grounded after passing through the resistor R1 and the resistor R2.

[0037] To further optimize the above technical solution, the insulation resistance measurement unit specifically includes: resistor R3, capacitor C1 and megohmmeter. The other end of the single-pole double-throw switch S4 is grounded through resistor R3 and capacitor C1. The other end of the single-pole double-throw switch S4 is also grounded through resistor R3 and megohmmeter.

[0038] To further optimize the above technical solution, the data transmission unit is a wireless Bluetooth module or a 5G signal module.

[0039] To further optimize the above technical solution, the terminal is a mobile phone APP or a computer.

[0040] To further optimize the above technical solution, the resistor R3 and the capacitor C1 form a voltage-reducing network.

[0041] Example 1, the disconnection capacity and overload tolerance of the relay must be coordinated with the fuse characteristics. According to IEC 60947-2, the disconnection capacity limit (ICU) and the nominal current load limit (ICW) of the relay must match the fuse characteristics. If an overcurrent is detected, the relay opens after a delay, and in the event of a short circuit, this delay prevents the load from exceeding its nominal limit. This means that after this delay, the relay must be able to cut off a current second only to the current that the fuse melts within the delay. Since the source impedance of the vehicle battery is around 100mΩ, the short-circuit current can reach 6000A or higher.

[0042] The present application embeds a vacuum port that can withstand a high voltage of 20kV, which is equivalent to the function of a vacuum circuit breaker.

[0043] Figure 1 The figure shows a schematic diagram of a medium- and high-voltage relay for line parameters. By operating the control signal of the relay to ground the line or connect the test instrument, the insulation resistance of the corresponding phase line can be measured, and the induced voltage of the corresponding phase line can be measured at the same time.

[0044] Figure 2 As shown, it is a circuit diagram of a high-voltage relay, including: a high-voltage test unit, a counterpart matching unit, a data transmission unit and a terminal; the high-voltage test unit is connected to the counterpart matching unit in three phases, the high-voltage test unit and the counterpart matching unit are both connected to the data transmission unit, and the data transmission unit is wirelessly connected to the terminal; the high-voltage test unit and the counterpart matching unit are high-voltage relays, and the high-voltage relay includes a current measuring unit, a testing device, and an induced voltage testing unit; the transmission line is connected to a first single-pole double-throw switch, one end of the first single-pole double-throw switch is connected to a second single-pole double-throw switch, and the other end is connected to a third single-pole double-throw switch through a current measuring unit, one end of the third single-pole double-throw switch is connected to the testing device, and one end is grounded, one end of the second single-pole double-throw switch is connected to the insulation resistance measuring unit, and the other end is connected to the induced voltage testing unit.

[0045] The first single-pole double-throw switch includes a single-pole double-throw switch S2, a single-pole double-throw switch S5, and a single-pole double-throw switch S7; the second single-pole double-throw switch includes a single-pole double-throw switch S4; and the third single-pole double-throw switch includes a single-pole double-throw switch S3, a single-pole double-throw switch S6, and a single-pole double-throw switch S8.

[0046] According to the requirements of line parameter test wiring, the device uses high-voltage relays to achieve the grounding and suspension of the instruments at both ends, so as to achieve "zero" inverted wiring during the test, so as to complete the entire test work in one wiring. When wiring, ensure that the device is in a grounded state; connect the device first and then connect the line end. When disconnecting, ensure that the device is in a grounded state; disconnect the line end first and then disconnect the device end.

[0047] Embodiment 2, Figure 3 As shown, it is a schematic diagram of Yuxiang line parameter test. Specifically, the A-phase line is connected to the single-pole double-throw switch S2, one end of the single-pole double-throw switch S2 is connected to the single-pole double-throw switch S3 through the current measuring unit A1, one end of the single-pole double-throw switch S3 is connected to the test device, and the other end is grounded, the other end of the single-pole double-throw switch S2 is connected to the single-pole double-throw switch S4, one end of the single-pole double-throw switch S4 is connected to the induction voltage test unit, and the other end is connected to the insulation resistance measurement unit. The B-phase line is connected to the single-pole double-throw switch S5, one end of the single-pole double-throw switch S5 is connected to the single-pole double-throw switch S6 through the current measuring unit A2, one end of the single-pole double-throw switch S6 is connected to the test device, and the other end is grounded, the other end of the single-pole double-throw switch S5 is connected to the single-pole double-throw switch S4, one end of the single-pole double-throw switch S4 is connected to the induction voltage test unit, and the other end is connected to the insulation resistance measurement unit. The C phase line is connected to the single-pole double-throw switch S7, one end of the single-pole double-throw switch S7 is connected to the single-pole double-throw switch S8 through the current measuring unit A3, one end of the single-pole double-throw switch S7 is connected to the test device, and the other end is grounded, and the other end of the single-pole double-throw switch S7 is connected to the single-pole double-throw switch S4, one end of the single-pole double-throw switch S4 is connected to the induced voltage test unit, and the other end is connected to the insulation resistance measuring unit. The induced voltage testing unit specifically includes: a resistor R1 and a resistor R2, and one end of the single-pole double-throw switch S4 is grounded after passing through the resistor R1 and the resistor R2. The insulation resistance measuring unit specifically includes: a resistor R3, a capacitor C1 and an ohmmeter, the other end of the single-pole double-throw switch S4 is grounded through the resistor R3 and the capacitor C1, and the other end of the single-pole double-throw switch S4 is also grounded through the resistor R3 and the ohmmeter.

[0048] Embodiment 3, after connecting the test equipment at both ends of the line (when there is a grounding wire), only one tester is needed to complete the insulation test, phase check, positive-sequence and zero-sequence impedance, positive-sequence and zero-sequence capacitance, DC resistance and other parameter tests of the entire line on a mobile phone. Compared with previous work, the work efficiency is greatly improved, as shown in Table 1.

[0049] Table 1 Comparison before and after innovation

[0050]

[0051] According to the non-contact high-voltage line parameter test device designed by the present invention, the line is grounded or connected to the test instrument by operating the control signal of the relay, so as to measure the insulation resistance of the corresponding phase lines, and at the same time, the induced voltage of the corresponding phase lines can be measured. During the entire test process, the wireless Bluetooth and 5G signal control (including the other end of the line) are used through the mobile phone APP, so that the human body and the instrument do not need to contact the line and the test device, which can effectively avoid the induced electricity of the line, completely eliminate the possibility of line induced electricity injuring people, and greatly improve the safety of line parameter testing.

[0052] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0053] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A non-contact high-voltage line parameter testing device, characterized in that: include: High voltage test unit, peer coordination unit, data transmission unit and terminal; The high voltage test unit is connected with the opposite end cooperation unit in three phases, the high voltage test unit and the opposite end cooperation unit are both connected with the data transmission unit, and the data transmission unit is wirelessly connected with the terminal; The high-voltage test unit and the opposite-end matching unit are high-voltage relays, which include a current measuring unit, a testing device, and an induced voltage testing unit; the transmission line is connected to a first single-pole double-throw switch, one end of the first single-pole double-throw switch is connected to a second single-pole double-throw switch, and the other end is connected to a third single-pole double-throw switch through a current measuring unit, one end of the third single-pole double-throw switch is connected to the testing device, and one end is grounded, one end of the second single-pole double-throw switch is connected to an insulation resistance measuring unit, and the other end is connected to the induced voltage testing unit.

2. A non-contact high-voltage line parameter testing device according to claim 1, characterized in that: The first single-pole double-throw switch includes a single-pole double-throw switch S2, a single-pole double-throw switch S5, and a single-pole double-throw switch S7; the second single-pole double-throw switch includes a single-pole double-throw switch S4; and the third single-pole double-throw switch includes a single-pole double-throw switch S3, a single-pole double-throw switch S6, and a single-pole double-throw switch S8.

3. A non-contact high-voltage line parameter testing device according to claim 2, characterized in that: The A-phase line is connected to a single-pole double-throw switch S2, one end of the single-pole double-throw switch S2 is connected to a single-pole double-throw switch S3 through a current measuring unit A1, one end of the single-pole double-throw switch S3 is connected to a testing device, and the other end is grounded, the other end of the single-pole double-throw switch S2 is connected to a single-pole double-throw switch S4, one end of the single-pole double-throw switch S4 is connected to an induced voltage testing unit, and the other end is connected to an insulation resistance measuring unit.

4. A non-contact high-voltage line parameter testing device according to claim 2, characterized in that: The B-phase line is connected to a single-pole double-throw switch S5, one end of the single-pole double-throw switch S5 is connected to a single-pole double-throw switch S6 through a current measuring unit A2, one end of the single-pole double-throw switch S6 is connected to a testing device, and the other end is grounded, the other end of the single-pole double-throw switch S5 is connected to a single-pole double-throw switch S4, one end of the single-pole double-throw switch S4 is connected to an induced voltage testing unit, and the other end is connected to an insulation resistance measuring unit.

5. A non-contact high-voltage line parameter testing device according to claim 2, characterized in that: The C phase line is connected to a single-pole double-throw switch S7, one end of the single-pole double-throw switch S7 is connected to a single-pole double-throw switch S8 through a current measuring unit A3, one end of the single-pole double-throw switch S7 is connected to a testing device, and the other end is grounded, the other end of the single-pole double-throw switch S7 is connected to a single-pole double-throw switch S4, one end of the single-pole double-throw switch S4 is connected to an induced voltage testing unit, and the other end is connected to an insulation resistance measuring unit.

6. A non-contact high-voltage line parameter testing device according to claim 2, characterized in that: The induction voltage test unit specifically includes: a resistor R1 and a resistor R2, and one end of a single-pole double-throw switch S4 is grounded through the resistor R1 and the resistor R2.

7. A non-contact high-voltage line parameter testing device according to claim 2, characterized in that: The insulation resistance measuring unit specifically includes: a resistor R3, a capacitor C1 and an ohmmeter. The other end of the single-pole double-throw switch S4 is grounded through the resistor R3 and the capacitor C1. The other end of the single-pole double-throw switch S4 is also grounded through the resistor R3 and the ohmmeter.

8. A non-contact high-voltage line parameter testing device according to claim 2, characterized in that: The data transmission unit is a wireless Bluetooth module or a 5G signal module.

9. A non-contact high-voltage line parameter testing device according to claim 2, characterized in that: The terminal is a mobile phone APP or a computer.

10. A non-contact high-voltage line parameter testing device according to claim 7, characterized in that: The resistor R3 and the capacitor C1 form a voltage-reducing network.

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