Device and method for measuring busbar loop resistance

Abstract

The invention discloses a device and a method for measuring bus loop resistance, and relates to the technical field of power equipment measurement; the device comprises a loop resistance tester, a first pair of measuring lines of the loop resistance tester are connected to the measuring point of the ground switch at the junction of the bus to be tested and the knife switch, and a second pair of measuring lines of the loop resistance tester are extended outwardly and connected to the measuring point of the ground switch outside the bus to be tested; the method is based on the above-mentioned device for measuring bus loop resistance, comprising the following steps: closing the ground switches on the side of the bus to be tested, opening the knife switches on the side of the bus to be tested, and measuring and obtaining data of the bus loop resistance; and accurately measuring the bus loop resistance by extending the measuring lines outwardly and connecting them to the measuring point of the ground switch outside the bus to be tested, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment measurement, and in particular to a device and method for measuring busbar loop resistance. Background Art

[0002] According to the regulations, the GIS busbar needs to test the conductive loop resistance. Contact surface oxidation, poor contact and other reasons will cause the equipment loop resistance to increase, the equipment temperature to rise, and the high temperature will further accelerate the contact surface oxidation, causing the equipment to continue to heat up. The equipment loop resistance needs to be measured regularly. Accurately measuring the equipment loop resistance can effectively determine whether the GIS equipment conductive loop has defects such as contact surface oxidation and poor contact, and avoid equipment heating due to excessive loop resistance, which affects the safe and stable operation of the equipment.

[0003] The search formula is TACD_ALL:(busbar AND loop resistance tester), and the relatively close existing technical solutions are as follows:

[0004] The authorization announcement number is CN 111521873 B, and the name is a method for measuring the loop resistance of the static contact of a GW16 type disconnector. It includes a fixed resistor R0, a contact resistor R1 and a contact resistor R2, the contact resistor R1 and the contact resistor R2 are connected in parallel, and the fixed resistor R0 is connected in series to the parallel circuit of the contact resistor R1 and the contact resistor R2, and the fixed resistor R0, the contact resistor R1 and the contact resistor R2 together constitute the loop resistance of the entire static contact. The method can measure the loop resistance of a single soft connection in the static contact of the disconnector by measuring the fixed resistor R0, the contact resistor R1 and the contact resistor R2 respectively, which makes up for the deficiency that the existing method can only measure the loop resistance of the entire static contact; and it can timely discover the situation that the loop resistance of a single soft connection of the static contact is locally too large, effectively improving the safety of the operation of the disconnector and the reliability of power supply.

[0005] The authorization announcement number is CN 111880005 B, and the name is a loop resistance tester and its control method. The loop resistance tester includes: at least one battery, a current limiting resistor, a charging capacitor, a bus capacitor and a semiconductor device group; the semiconductor device group includes: a first semiconductor device, a second semiconductor device, a third semiconductor device and a fourth semiconductor device; the second semiconductor device and the third semiconductor device are disconnected during the charging stage of the loop resistance tester, and are turned on during the power supply stage of the loop resistance tester; the first semiconductor device and the fourth semiconductor device are used to turn on the battery, the current limiting resistor and the first capacitor during the charging stage, and cut off the discharge current from the first end of the charging capacitor to the second end of the charging capacitor during the power supply stage. This technical solution reduces the output current of the battery, reduces the number of batteries, reduces costs, reduces the size and weight of the device, and simplifies the control of the circuit.

[0006] The authorization announcement number is CN 215678556 U, and the name is a switch cabinet whole cabinet loop resistance test device. It includes a second three-phase busbar, a second three-phase cable connector connected to the second three-phase busbar, a third three-phase busbar, a third three-phase cable connector connected to the third three-phase busbar, a testing mechanism and a clamping mechanism. The corresponding phases of the first, second and third three-phase busbars are connected respectively. The clamping mechanism includes a first wiring clamp connected to the negative current output end and the negative voltage output end, a second wiring clamp connected to the positive voltage output end, and a third wiring clamp connected to the positive current output end. The first wiring clamp is clamped on one phase of the first three-phase cable connector, and the second and third wiring clamps are clamped on the second and third three-phase cable connectors and the first three-phase cable connector. The technical solution can avoid the risk of falling from a height and electric shock during the test, and the operation process is simple and convenient, which greatly improves work efficiency.

[0007] The authorization announcement number is CN 217085197 U, and the name is a circuit for quickly detecting the resistance of the circuit breaker interval loop and the dynamic characteristics of the circuit breaker. It includes: 1# busbar, 2# busbar, busbar side isolation switch, circuit breaker switch, load side isolation switch, grounding switch, load side fast grounding switch, soft insulated copper wire, grounding switch tap removable grounding copper busbar, grounding switch lead-out tap copper busbar, circuit breaker loop resistance test line, circuit breaker dynamic characteristics test line, circuit breaker loop resistance tester and circuit breaker dynamic characteristics tester. This technical solution can realize the simultaneous connection of the test lines of two tests, and the circuit breaker loop resistance and circuit breaker dynamic characteristics tests can be performed separately by switching the corresponding switches added.

[0008] Combining the above four patent documents and existing technical solutions, the inventors analyzed and found that the following technical problems exist in the existing technical solutions.

[0009] The following problems exist in the resistance test of GIS long bus loop:

[0010] Earth switches D1, D2, D3 and D4; switch K1, K2; switches G1, G2 are all sealed inside the GIS tank, and only measuring points 1, 2, 3, 4 are in contact with the outside and can be connected to test lines.

[0011] like Figure 7As shown in the figure, most 3 / 2 busbars are equipped with grounding switches D1 and D2 on the outside of the outermost branch. If there is no grounding switch, it is necessary to expand and add grounding switches on the outside of the branch. Take one phase of the 3 / 2 busbar as an example, and the other two phases are executed as a reference. Since there is current flowing between busbar measuring points 5 and 6 during equipment operation, there is no current flowing outside measuring points 5 and 6 and no need to test. Therefore, testing the busbar loop resistance requires testing the loop resistance between measuring points 5 and 6 on the busbar. D1 and D2 are the outermost grounding switches of busbar 1, and D3 and D4 are the grounding switches on the outermost branch that are only adjacent to the busbar. K1 and K2 are switches; G1 and G2 are switches. Remove the grounding points of grounding switches D1, D2, D3, and D4, put D1, D2, D3, and D4 in the closed position, and K1 and K2 in the open position. Other switches, switches and earthing knives connected to bus 1 are placed in the open position to ensure that during the test, the current can only flow into the bus through D3 and then flow out of the bus from D4, without any other bypass current. Measuring point 1 for I1 and U1 earthing knife D3, measuring point 2 for I2 and U2 earthing knife D4. Operate the loop resistance tester to test the loop resistance of the bus. The test result is the sum of the earthing knife D3, earthing knife D4 and the bus loop resistance. If the loop resistance of any one or several devices in the earthing knife D3, earthing knife D4 and the bus exceeds the standard, the test result will be abnormal. It is impossible to accurately judge whether the loop resistance of the bus is qualified.

[0012] Existing technical problems and considerations:

[0013] How to solve the technical problem of inaccurate measurement of bus loop resistance. Summary of the invention

[0014] The technical problem to be solved by the present invention is to provide a device and method for measuring bus loop resistance, so as to solve the technical problem of inaccurate measurement of bus loop resistance.

[0015] In order to solve the above technical problems, the technical solution adopted by the present invention is: a device for measuring the bus loop resistance includes a loop resistance tester, a first pair of measuring lines of the loop resistance tester are connected to the measuring point of the ground switch at the junction of the bus to be tested and the knife switch, and a second pair of measuring lines of the loop resistance tester are extended outwardly and connected to the measuring point of the ground switch outside the bus to be tested.

[0016] A further technical solution is that: the first current output terminal I+ of the loop resistance tester is connected to the measuring point of the grounding switch outside the bus to be tested on the first switch side, the first measurement input terminal V+ of the loop resistance tester is connected to the measuring point of the grounding switch at the junction of the bus to be tested and the first switch, the second measurement input terminal V- of the loop resistance tester is connected to the measuring point of the grounding switch at the junction of the bus to be tested and the second switch, and the second current output terminal I- of the loop resistance tester is connected to the measuring point of the grounding switch outside the bus to be tested on the second switch side.

[0017] A further technical solution is that: the first measurement input terminal V+ of the loop resistance tester is connected to the measurement point of the grounding switch outside the bus to be tested on the first switch side, the first current output terminal I+ of the loop resistance tester is connected to the measurement point of the grounding switch at the junction of the bus to be tested and the first switch, the second current output terminal I- of the loop resistance tester is connected to the measurement point of the grounding switch at the junction of the bus to be tested and the second switch, and the second measurement input terminal V- of the loop resistance tester is connected to the measurement point of the grounding switch outside the bus to be tested on the second switch side.

[0018] A further technical solution is that: the measuring line of the loop resistance tester is connected to the measuring point of the ground switch at the junction of the busbar to be tested and the switch through the ground grid.

[0019] A further technical solution is that: the first measurement input terminal V+ of the loop resistance tester is connected to the measurement point of the earth switch outside the bus to be tested on the first switch side, the first current output terminal I+ of the loop resistance tester is connected to the measurement point of the earth switch at the junction of the bus to be tested and the first switch, the second current output terminal I- of the loop resistance tester is connected to the measurement point of the earth switch at the junction of the bus to be tested and the second switch via the ground network, and the second measurement input terminal V- of the loop resistance tester is connected to the measurement point of the earth switch outside the bus to be tested on the second switch side.

[0020] A further technical solution is that: one measuring line of the first pair of measuring lines of the loop resistance tester is connected to the measuring point of the ground switch at the junction of the busbar to be tested and the first switch of the first phase, the other measuring line of the first pair of measuring lines of the loop resistance tester is connected to the measuring point of the ground switch at the junction of the busbar to be tested and the first switch of the second phase, one measuring line of the second pair of measuring lines of the loop resistance tester is connected to the measuring point of the ground switch outside the busbar to be tested on the first switch side of the first phase, the other measuring line of the second pair of measuring lines of the loop resistance tester is connected to the measuring point of the ground switch outside the busbar to be tested on the second switch side of the first phase, and the measuring point of the ground switch at the junction of the busbar of the first phase and the second switch is connected to the measuring point of the ground switch at the junction of the busbar of the second phase and the second switch.

[0021] A further technical solution is that: the first measurement input terminal V+ of the loop resistance tester is connected to the measurement point of the grounding switch outside the busbar to be tested on the first switch side of phase B, the first current output terminal I+ of the loop resistance tester is connected to the measurement point of the grounding switch at the junction of the busbar to be tested of phase B and the first switch, the second current output terminal I- of the loop resistance tester is connected to the measurement point of the grounding switch at the junction of the busbar of phase A to be tested and the first switch, the second measurement input terminal V- of the loop resistance tester is connected to the measurement point of the grounding switch outside the busbar to be tested on the second switch side of phase B, and the measurement point of the grounding switch at the junction of the busbar of phase A and the second switch is connected to the measurement point of the grounding switch at the junction of the busbar of phase B and the second switch.

[0022] A further technical solution is that the loop resistance tester includes a first current output terminal I+, a second current output terminal I-, a first measurement input terminal V+ and a second measurement input terminal V-, the first current output terminal I+ and the second current output terminal I- are a pair, and the first measurement input terminal V+ and the second measurement input terminal V- are a pair.

[0023] A method for measuring bus loop resistance, based on the above-mentioned device for measuring bus loop resistance, includes the following steps: closing the ground switches on the bus side to be measured, opening the knife switches on the bus side to be measured, and measuring to obtain data on the bus loop resistance.

[0024] A further technical solution is that when the measuring line of the loop resistance tester is connected to the measuring point of the grounding knife at the junction of the busbar to be tested and the knife switch through the grounding network, the grounding knife is continuously grounded.

[0025] The beneficial effects of adopting the above technical solution are:

[0026] A device for measuring busbar loop resistance includes a loop resistance tester, wherein a first pair of measuring lines of the loop resistance tester is connected to a measuring point of a ground switch at the junction of a busbar to be tested and a switch, and a second pair of measuring lines of the loop resistance tester is connected to a measuring point of a ground switch outside the busbar to be tested. The technical solution achieves accurate measurement of busbar loop resistance by connecting the measuring lines to the measuring points of the ground switch outside the busbar to be tested.

[0027] A method for measuring bus loop resistance, based on the above-mentioned device for measuring bus loop resistance, includes the following steps: closing the grounding switches on the bus to be measured, opening the switches on the bus to be measured, and measuring the data of the bus loop resistance. This technical solution achieves accurate measurement of the bus loop resistance by connecting the measuring line to the measuring point of the grounding switch outside the bus to be measured.

[0028] Please refer to the detailed description of the specific implementation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a wiring diagram of embodiment 1 of the present invention;

[0030] Figure 2 is a wiring diagram of embodiment 2 of the present invention;

[0031] Figure 3 is a wiring diagram of embodiment 3 of the present invention;

[0032] Figure 4 is a first wiring diagram of embodiment 4 of the present invention;

[0033] Figure 5 is the second wiring diagram of embodiment 4 of the present invention;

[0034] Figure 6 is the third wiring diagram of embodiment 4 of the present invention;

[0035] Figure 7 This is a typical 3 / 2 wiring diagram;

[0036] Figure 8 This is the wiring diagram for conventional testing of bus loop resistance. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0039] Embodiment 1:

[0040] like Figure 1 As shown, the present invention discloses a device for measuring bus loop resistance, including a loop resistance tester, wherein the loop resistance tester includes a first current output terminal I+, a second current output terminal I-, a first measurement input terminal V+ and a second measurement input terminal V-, the first current output terminal I+ and the second current output terminal I- are a pair, and the first measurement input terminal V+ and the second measurement input terminal V- are a pair.

[0041] like Figure 1 As shown, the first current output terminal I+ corresponds to I1.

[0042] like Figure 1 As shown, the second current output terminal I- corresponds to I2.

[0043] like Figure 1 As shown, the first measurement input terminal V+ corresponds to U1.

[0044] like Figure 1 As shown, the second measurement input terminal V- corresponds to U2.

[0045] like Figure 1 As shown in FIG. 1 , the bus to be tested corresponds to bus 1.

[0046] like Figure 1 As shown, the first knife switch corresponds to K1.

[0047] like Figure 1 As shown, the second knife switch corresponds to K2.

[0048] like Figure 1 As shown, the measuring point of the outer ground switch of the busbar to be tested on the first switch side corresponds to measuring point 3.

[0049] like Figure 1 As shown, the measuring point of the ground switch at the junction of the busbar to be tested and the first switch corresponds to measuring point 1.

[0050] like Figure 1 As shown, the measuring point of the ground switch at the junction of the busbar to be tested and the second switch corresponds to measuring point 2.

[0051] like Figure 1 As shown, the measuring point of the outer ground switch of the busbar to be tested on the second switch side corresponds to measuring point 4.

[0052] like Figure 1 As shown, the first current output terminal I+ of the loop resistance tester is connected to the measuring point of the grounding switch outside the bus to be tested on the first switch side, the first measuring input terminal V+ of the loop resistance tester is connected to the measuring point of the grounding switch at the junction of the bus to be tested and the first switch, the second measuring input terminal V- of the loop resistance tester is connected to the measuring point of the grounding switch at the junction of the bus to be tested and the second switch, and the second current output terminal I- of the loop resistance tester is connected to the measuring point of the grounding switch outside the bus to be tested on the second switch side.

[0053] like Figure 1 As shown, the measuring lines connected to the first measuring input terminal V+ and the second measuring input terminal V− are a first pair of measuring lines, and the measuring lines connected to the first current output terminal I+ and the second current output terminal I− are a second pair of measuring lines.

[0054] Among them, the loop resistance tester itself is a prior art and will not be described in detail here.

[0055] Embodiment 2:

[0056] like Figure 2 As shown, the present invention discloses a device for measuring bus loop resistance, including a loop resistance tester, wherein the loop resistance tester includes a first current output terminal I+, a second current output terminal I-, a first measurement input terminal V+ and a second measurement input terminal V-, the first current output terminal I+ and the second current output terminal I- are a pair, and the first measurement input terminal V+ and the second measurement input terminal V- are a pair.

[0057] like Figure 2 As shown, the first current output terminal I+ corresponds to I1.

[0058] like Figure 2As shown, the second current output terminal I- corresponds to I2.

[0059] like Figure 2 As shown, the first measurement input terminal V+ corresponds to U1.

[0060] like Figure 2 As shown, the second measurement input terminal V- corresponds to U2.

[0061] like Figure 2 As shown in FIG. 1 , the bus to be tested corresponds to bus 1.

[0062] like Figure 2 As shown, the first knife switch corresponds to K1.

[0063] like Figure 2 As shown, the second knife switch corresponds to K2.

[0064] like Figure 2 As shown, the measuring point of the outer ground switch of the busbar to be tested on the first switch side corresponds to measuring point 3.

[0065] like Figure 2 As shown, the measuring point of the ground switch at the junction of the busbar to be tested and the first switch corresponds to measuring point 1.

[0066] like Figure 2 As shown, the measuring point of the ground switch at the junction of the busbar to be tested and the second switch corresponds to measuring point 2.

[0067] like Figure 2 As shown, the measuring point of the outer ground switch of the busbar to be tested on the second switch side corresponds to measuring point 4.

[0068] like Figure 2 As shown, the first measurement input terminal V+ of the loop resistance tester is connected to the measurement point of the grounding switch outside the bus to be tested on the first switch side, the first current output terminal I+ of the loop resistance tester is connected to the measurement point of the grounding switch at the junction of the bus to be tested and the first switch, the second current output terminal I- of the loop resistance tester is connected to the measurement point of the grounding switch at the junction of the bus to be tested and the second switch, and the second measurement input terminal V- of the loop resistance tester is connected to the measurement point of the grounding switch outside the bus to be tested on the second switch side.

[0069] like Figure 2 As shown, the measuring lines connected to the first current output terminal I+ and the second current output terminal I− are a first pair of measuring lines, and the measuring lines connected to the first measurement input terminal V+ and the second measurement input terminal V− are a second pair of measuring lines.

[0070] Among them, the loop resistance tester itself is a prior art and will not be described in detail here.

[0071] Embodiment 3:

[0072] like Figure 3As shown, the present invention discloses a device for measuring bus loop resistance, including a loop resistance tester, wherein the loop resistance tester includes a first current output terminal I+, a second current output terminal I-, a first measurement input terminal V+ and a second measurement input terminal V-, the first current output terminal I+ and the second current output terminal I- are a pair, and the first measurement input terminal V+ and the second measurement input terminal V- are a pair.

[0073] like Figure 3 As shown, the first current output terminal I+ corresponds to I1.

[0074] like Figure 3 As shown, the second current output terminal I- corresponds to I2.

[0075] like Figure 3 As shown, the first measurement input terminal V+ corresponds to U1.

[0076] like Figure 3 As shown, the second measurement input terminal V- corresponds to U2.

[0077] like Figure 3 As shown, the bus to be tested corresponds to bus 1.

[0078] like Figure 3 As shown, the first knife switch corresponds to K1.

[0079] like Figure 3 As shown, the second knife switch corresponds to K2.

[0080] like Figure 3 As shown, the measuring point of the outer ground switch of the busbar to be tested on the first switch side corresponds to measuring point 3.

[0081] like Figure 3 As shown, the measuring point of the ground switch at the junction of the busbar to be tested and the first switch corresponds to measuring point 1.

[0082] like Figure 3 As shown, the measuring point 2 of the earth switch where the busbar to be measured is combined with the second switch is grounded.

[0083] like Figure 3 As shown, the measuring point of the outer ground switch of the busbar to be tested on the second switch side corresponds to measuring point 4.

[0084] like Figure 3 As shown, the first measurement input terminal V+ of the loop resistance tester is connected to the measurement point of the earthing knife outside the bus to be tested on the first switch side, the first current output terminal I+ of the loop resistance tester is connected to the measurement point of the earthing knife at the junction of the bus to be tested and the first switch, the second current output terminal I- of the loop resistance tester is connected to the measurement point of the earthing knife at the junction of the bus to be tested and the second switch via the ground grid, and the second measurement input terminal V- of the loop resistance tester is connected to the measurement point of the earthing knife outside the bus to be tested on the second switch side.

[0085] like Figure 3 As shown, the measuring lines connected to the first current output terminal I+ and the second current output terminal I− are a first pair of measuring lines, and the measuring lines connected to the first measurement input terminal V+ and the second measurement input terminal V− are a second pair of measuring lines.

[0086] Among them, the loop resistance tester itself is a prior art and will not be described in detail here.

[0087] Embodiment 4:

[0088] like Figures 4 to 6 As shown, the present invention discloses a device for measuring bus loop resistance, including a loop resistance tester, wherein the loop resistance tester includes a first current output terminal I+, a second current output terminal I-, a first measurement input terminal V+ and a second measurement input terminal V-, the first current output terminal I+ and the second current output terminal I- are a pair, and the first measurement input terminal V+ and the second measurement input terminal V- are a pair.

[0089] like Figure 4 and Figure 5 As shown, the first current output terminal I+ corresponds to I1.

[0090] like Figure 4 and Figure 5 As shown, the second current output terminal I- corresponds to I2.

[0091] like Figure 4 and Figure 5 As shown, the first measurement input terminal V+ corresponds to U1.

[0092] like Figure 4 and Figure 5 As shown, the second measurement input terminal V- corresponds to U2.

[0093] like Figure 4 As shown, the busbar under test of phase B corresponds to phase B of busbar No. 1.

[0094] like Figure 5 As shown, the busbar to be tested of phase A corresponds to busbar No. 1 A.

[0095] like Figure 4 As shown, the first switch of the B-phase bus to be tested corresponds to BK1.

[0096] like Figure 5 As shown, the first bus switch of phase A to be tested corresponds to AK1.

[0097] like Figure 4 As shown, the second knife switch of the B-phase bus to be tested corresponds to BK2.

[0098] like Figure 5 As shown, the second switch of the busbar to be tested on phase A corresponds to AK2.

[0099] like Figure 5 As shown, the measuring point of the ground switch at the junction of the busbar to be tested of phase A and the first switch corresponds to measuring point 1.

[0100] like Figure 5 As shown, the measuring point of the ground switch at the junction of the busbar to be tested of phase A and the second switch corresponds to measuring point 2.

[0101] like Figure 5 As shown, the measuring point of the outer ground switch of the busbar to be tested on the first switch side of phase A corresponds to measuring point 3.

[0102] like Figure 5 As shown, the measuring point of the outer ground switch of the busbar to be tested on the second switch side of phase A corresponds to measuring point 4.

[0103] like Figure 4 As shown, the measuring point of the ground switch at the junction of the busbar to be tested of phase B and the first switch corresponds to measuring point 7.

[0104] like Figure 4 As shown, the measuring point of the ground switch at the junction of the busbar to be tested of phase B and the second switch corresponds to measuring point 8.

[0105] like Figure 4 As shown, the measuring point of the outer ground switch of the busbar to be tested on the first switch side of phase B corresponds to measuring point 9.

[0106] like Figure 4 As shown, the measuring point of the outer ground switch of the busbar to be tested on the second switch side of phase B corresponds to measuring point 10.

[0107] like Figure 4 As shown, the first measurement input terminal V+ of the loop resistance tester is connected to the measurement point 9 of the outer grounding knife of the bus to be tested on the first switch side of the B phase, the first current output terminal I+ of the loop resistance tester is connected to the measurement point 7 of the grounding knife at the junction of the bus to be tested and the first switch of the B phase, and the second measurement input terminal V- of the loop resistance tester is connected to the measurement point 10 of the outer grounding knife of the bus to be tested on the second switch side of the B phase.

[0108] like Figure 5 As shown, the second current output terminal I- of the loop resistance tester is connected to the measuring point 1 of the ground switch at the junction of the busbar of the A phase to be tested and the first switch.

[0109] like Figure 6 As shown, the measuring point 2 of the ground switch at the junction of the busbar of phase A and the second switch is connected to the measuring point 8 of the ground switch at the junction of the busbar of phase B and the second switch.

[0110] like Figure 4 and Figure 5As shown, the measuring lines connected to the first current output terminal I+ and the second current output terminal I− are a first pair of measuring lines, and the measuring lines connected to the first measurement input terminal V+ and the second measurement input terminal V− are a second pair of measuring lines.

[0111] Among them, the loop resistance tester itself is a prior art and will not be described in detail here.

[0112] Embodiment 5:

[0113] The present invention discloses a method for measuring bus loop resistance, which is based on the device of embodiment 1 and includes the following steps: closing the ground switches on the bus side to be measured, opening the knife switches on the bus side to be measured, and measuring and obtaining data on the bus loop resistance.

[0114] Example 5 Description:

[0115] The technical solution of Example 5 is a method for accurately measuring the resistance of a GIS bus loop, specifically a method for measuring the resistance of a GIS bus loop by expanding a current line.

[0116] like Figure 1 As shown, in order to accurately test the wiring diagram of the GIS bus loop resistance, remove the grounding points of the grounding knife D1, D2, D3, and D4, and put D1, D2, D3, and D4 in the closed position, and K1 and K2 in the open position. Other knife switches, switches, and grounding knives directly connected to bus 1 are all placed in the open position to ensure that during the test, the output current can only flow back to the loop resistance tester through I1→D1→bus→measurement point 5→bus→measurement point 6→D2→I2, and there will be no other bypass diversion. The current test line is extended outward, I1 grounding knife D1 measurement point 3, I2 grounding knife D2 measurement point 4, U1 grounding knife D3 measurement point 1, U2 grounding knife D4 measurement point 2. Operate the loop resistance tester, and the output current flows back to the loop resistance tester through I1→D1→busbar→measuring point 5→busbar→measuring point 6→D2→I2; the voltage test line U1 extends to the measuring point 5 inside the GIS through D3, and the voltage test line U2 extends to the measuring point 6 inside the GIS through D4. No output current flows through D3 and D4, which can be regarded as extensions of the voltage test lines. Therefore, the test result at this time is the loop resistance value between measuring points 5 and 6, which is also the accurate loop resistance value of the busbar.

[0117] Concept of Embodiment 5:

[0118] Move the current output line outward, use I1 grounding knife D1 to measure point 3, use I2 grounding knife D2 to measure point 4, and keep the voltage test line in the same position and connect it to measuring points 5 and 6 at both ends of bus 1 via D3 and D4 to accurately test the loop resistance of bus 1.

[0119] Embodiment 6:

[0120] The present invention discloses a method for measuring bus loop resistance, which is based on the device of Example 2 and includes the following steps: closing the ground switches on the bus side to be measured, opening the knife switches on the bus side to be measured, and measuring and obtaining data on the bus loop resistance.

[0121] Example 6 Description:

[0122] The technical solution of Example 6 is a method for accurately measuring the resistance of a GIS bus loop, specifically a method for measuring the resistance of a GIS bus loop by extending a voltage test line.

[0123] like Figure 2 As shown, in order to accurately test the wiring diagram of the GIS busbar loop resistance, remove the grounding points of the grounding knife D1, D2, D3, and D4, put D1, D2, D3, and D4 in the closed position, and put K1 and K2 in the open position. Other knife switches, switches, and grounding knives directly connected to busbar 1 are all placed in the open position to ensure that the output current can only flow back to the loop resistance tester through I1→D3→busbar→D4→I2 during the test, and there will be no other bypass diversion. The voltage test line is extended outward, I1 grounding knife D3 measuring point 1, I2 grounding knife D4 measuring point 2, U1 grounding knife D1 measuring point 3, U2 grounding knife D2 measuring point 4. Operate the loop resistance tester, and the output current flows back to the tester through I1→D3→measuring point 5→busbar→measuring point 6→D4→I2; the voltage test line U1 extends through D1 to the measuring point 5 connected to busbar 1 inside the GIS, and the voltage test line U2 extends through D2 to the measuring point 6 connected to busbar 1 inside the GIS. No output current flows through D1 and D2, which can be regarded as extensions of the voltage test lines. Therefore, the test result at this time is the accurate loop resistance value of the busbar.

[0124] Concept of Example 6:

[0125] Move the voltage output line outward, connect the voltage test line to the measuring points 5 and 6 of bus 1, and accurately test the loop resistance of bus 1.

[0126] Embodiment 7:

[0127] The present invention discloses a method for measuring bus loop resistance, which is based on the device of Example 3 and includes the following steps: when the measuring line of the loop resistance tester is connected to the measuring point of the ground switch at the junction of the bus to be tested and the knife switch through the ground network, the ground switch is continuously grounded, the ground switches on the bus to be tested side are closed, and the knife switches on the bus to be tested side are opened, and the data of the bus loop resistance is measured.

[0128] Example 7 Description:

[0129] The technical solution of Example 7 is a method for accurately measuring the resistance of a GIS bus loop, specifically a method for measuring the resistance of a GIS bus loop by using ground grid diversion.

[0130] The technical problems to be solved by Example 7 are as follows:

[0131] First, the busbar is large in size and long in length. The length of a 1000kV GIS busbar is over 100 meters. The voltage test line is small in diameter and small in size, which can easily meet the requirements. The loop resistance current output line is thick in diameter and heavy in weight. For ease of use, the commonly used loop resistance tester current output line is about 10 meters long.

[0132] like Figure 7 As shown in the figure, the conventional GIS bus loop resistance test wiring. The current output line length needs to be equal to the bus length. The conventional loop resistance meter current output line cannot meet the test requirements. Using a longer current output line is time-consuming, labor-intensive, and inefficient.

[0133] Second, if Figure 7 As shown, most 3 / 2 busbars are equipped with grounding switches D1 and D2 on the outside of the outermost branch. If there is no grounding switch, it is necessary to expand and add grounding switches on the outside of the branch. Take one phase of the 3 / 2 busbar as an example, and the other two phases are executed as a reference. Since there is current flowing between busbar measuring points 5 and 6 during equipment operation, there is no current flowing outside measuring points 5 and 6 and no need to test. Therefore, testing the busbar loop resistance requires testing the loop resistance between measuring points 5 and 6 on the busbar. D1 and D2 are the outermost grounding switches of busbar 1, and D3 and D4 are the grounding switches on the outermost branch that are only adjacent to the busbar. K1 and K2 are switches; G1 and G2 are switches. Remove the grounding points of grounding switches D1, D2, D3, and D4, put D1, D2, D3, and D4 in the closed position, and K1 and K2 in the open position. Other switches, switches and earthing knives connected to bus 1 are placed in the open position to ensure that during the test, the current can only flow into the bus through D3 and then flow out of the bus from D4, without any other bypass current. Measuring point 1 for I1 and U1 earthing knife D3, measuring point 2 for I2 and U2 earthing knife D4. Operate the loop resistance tester to test the loop resistance of the bus. The test result is the sum of the earthing knife D3, earthing knife D4 and the bus loop resistance. If the loop resistance of any one or several devices in the earthing knife D3, earthing knife D4 and the bus exceeds the standard, the test result will be abnormal. It is impossible to accurately judge whether the loop resistance of the bus is qualified.

[0134] like Figure 3As shown, in order to accurately test the GIS bus loop resistance wiring diagram, the grounding points of the grounding knife D1, D2, and D3 are removed, and the grounding point of D4 is not removed. D1, D2, D3, and D4 are placed in the closed position, and K1 and K2 are placed in the open position. Other knife switches, switches, and grounding knives connected to bus 1 are placed in the open position to ensure that the current can only pass through the loop resistance tester I1→D3→measuring point 5→bus→measuring point 6→D4→grounding network→loop resistance tester I2 during the test, and there will be no other bypass diversion. The loop resistance tester is arranged near D3, I1 grounding knife D3 measuring point 1, U1 grounding knife D1 measuring point 3, and I2 is connected to the nearest grounding point of the grounding network. Since I2 only needs to find a nearby grounding point to ground, the length of the test line is shortened, and the test line of the ordinary loop resistance tester can meet the test requirements. U2 grounding knife D2 measuring point 4. Operate the loop resistance tester, and the test current goes through loop resistance tester I1→D3→measuring point 5→bus→measuring point 6→D4→loop resistance tester I2; the voltage test line is extended outward, the voltage test line U1 goes through U1→D1→bus→to measuring point 5, and the voltage test line U2 goes through U2→D2→bus→to measuring point 6. No test current flows through D1, D2, the bus between D1 and measuring point 5, and the bus between D1 and measuring point 5, which can be regarded as extensions of the voltage test line. Therefore, the test result at this time is the accurate loop resistance value of the bus between measuring point 5 and measuring point 6, and the loop resistance of bus 1.

[0135] Beneficial technical effects of Example 7:

[0136] First, accurately test the bus loop resistance and eliminate the interference of the ground switch on the test.

[0137] Second, ordinary loop resistance current test wires can meet the requirements, and there is no need to carry large and heavy extension current wires.

[0138] Concept of Example 7:

[0139] Move the voltage test line outward, and use D1 and D2 as extensions of the voltage test line to connect the two ends of the busbar. The current line remains in position and is connected to the two ends of busbar 1 through D3 and D4 to accurately test the loop resistance of busbar 1.

[0140] Embodiment 8:

[0141] The present invention discloses a method for measuring bus loop resistance, which is based on the device of Example 4 and includes the following steps: closing the ground switches on the bus side to be measured, opening the knife switches on the bus side to be measured, and measuring and obtaining data on the bus loop resistance.

[0142] Example 8 Description:

[0143] The technical solution of Example 8 is a method for accurately measuring the resistance of a GIS bus loop, specifically a method for measuring the resistance of a GIS bus loop by using adjacent phase current diversion.

[0144] The technical problems to be solved in Example 8 are as follows:

[0145] First, the busbar is large in size and long in length. The length of a 1000kV GIS busbar is over 100 meters. The voltage test line is small in diameter and small in size, which can easily meet the requirements. The loop resistance current output line is thick in diameter and heavy in weight. For ease of use, the commonly used loop resistance tester current output line is about 10 meters long.

[0146] like Figure 8 As shown in the figure, the conventional GIS bus loop resistance test wiring. The current output line length needs to be equal to the bus length. The conventional loop resistance meter current output line cannot meet the test requirements. Using a longer current output line is time-consuming, labor-intensive, and inefficient.

[0147] Second, if Figure 8 As shown, most 3 / 2 busbars are equipped with grounding switches BD1 and BD2 on the outside of the outermost branch. If there is no grounding switch, it is necessary to expand and add grounding switches on the outside of the branch. Take the B phase in the 3 / 2 busbar as an example, and the other two phases are executed for reference. Since there is current flowing between the busbar measuring points 11 and 12 during the operation of the equipment, there is no current flowing outside the measuring points 11 and 12 and no test is required. Therefore, testing the busbar loop resistance requires testing the loop resistance between the measuring points 11 and 12 on the busbar. BD1 and BD2 are the outermost grounding switches of busbar B phase 1; BD3 and BD4 are the grounding switches on the outermost branch of phase B that are only adjacent to the busbar; BK1 and BK2 are two switches for phase B; BG1 and BG2 are two switches for phase B. Remove the grounding points of grounding switches BD1, BD2, BD3, and BD4, and place BD1, BD2, BD3, and BD4 in the closed position; BK1 and BK2 in the open position; BG1 and BG2 in the open position, and other switches, switches, and grounding switches connected to bus B phase 1 are all in the open position to ensure that the loop resistance output current can only flow back to the loop resistance tester through I1→measurement point 7→BD3→measurement point 11→bus B phase 1→measurement point 12→BD4→measurement point 8→I2 during the test, and there will be no other bypass current. I1, U1 grounding switch BD3 measurement point 7, I2, U2 grounding switch BD4 measurement point 8. Operate the loop resistance tester to test the loop resistance of the busbar, and the test result is the sum of the busbar loop resistance between grounding switch BD3; grounding switch BD4; and measurement points 11 and 12. If the loop resistance of any one or several devices in grounding switch BD3, grounding switch BD4, and the busbar exceeds the standard, the test result will be abnormal. It is impossible to accurately determine whether the loop resistance of the busbar is qualified.

[0148] like Figure 4 , Figure 5 , Figure 6 As shown, remove the grounding points of earthing switches AD1, AD2, AD3, AD4; BD1, BD2, BD3, BD4, and put AD1, AD2, AD3, AD4; BD1, BD2, BD3, BD4 in the closed position; AK1, AK2, BK1, BK2 in the open position. The knife switches, switches and earthing switches connected to bus 1 for the other three phases are all in the open position. The loop resistance tester is arranged near measuring point 1 and measuring point 7.

[0149] like Figure 6 As shown, measure point 2 and measure point 8 with 100mm 2 Copper cables provide reliable connections.

[0150] like Figure 4 As shown, the current output line I1 of the loop resistance tester is connected to the measuring point 7.

[0151] like Figure 5 As shown, I2 is connected to measuring point 1.

[0152] like Figure 4 As shown, the voltage measurement line U1 is connected to the measuring point 9, and U2 is connected to the measuring point 10.

[0153] like Figure 4 , Figure 5 , Figure 6 As shown, the output current tested by the loop resistance tester flows back to the loop resistance tester via I1→measuring point 7→BD3→measuring point 11→busbar between measuring point 11 and measuring point 12→measuring point 12→BD4→measuring point 8→measuring point 2→AD4→measuring point 6→busbar between measuring point 6 and measuring point 5→measuring point 5→AD3→I2.

[0154] Since the loop resistance tester is arranged near measuring point 1 and measuring point 7, I1 is connected to measuring point 7 and I2 is connected to measuring point 1, and the current output line of the ordinary loop resistance tester can meet the test requirements. Operate the loop resistance tester, and the output current of the tester flows back to the loop resistance tester through I1→measuring point 7→BD3→measuring point 11→bus between measuring point 11 and measuring point 12→measuring point 12→BD4→measuring point 8→measuring point 2→AD4→measuring point 6→bus between measuring point 6 and measuring point 5→measuring point 5→AD3→I2; the voltage test line U1 is connected to measuring point 11 through measuring point 9→BD1, and the voltage test line U2 is connected to measuring point 12 through measuring point 10→BD2. The test result at this time is the accurate loop resistance of bus B phase 1 between measuring point 11 and measuring point 12.

[0155] Beneficial technical effects of Example 8:

[0156] First, accurately test the bus loop resistance and eliminate the interference of the ground switch on the test.

[0157] Second, ordinary loop resistance current output cables can meet the requirements, and there is no need to carry large and heavy extension current cables.

[0158] Concept of Example 8:

[0159] First, short-circuit the measuring points 2 and 8 of phases A and B. After the current is output through I1, it enters the B phase of bus 1 through measuring point 7, enters the A phase of bus 1 through measuring points 8 and 2, and flows back to the loop resistance tester through measuring point 1. Since the loop resistance tester is arranged near measuring points 1 and 7, I1 is connected to measuring point 7 and I2 is connected to measuring point 1, and the current output line of the ordinary loop resistance tester can meet the test requirements.

[0160] Second, since there is no output current flowing through the grounding switches BD1 and BD2 connected to the voltage measurement line, it is equivalent to the extension of the voltage measurement line. After extending into the GIS, it is connected to measuring points 11 and 12 to test the accurate loop resistance of phase B of bus 1, eliminating the interference of the grounding switch loop resistance.

[0161] For a comparison table of the measurement data of the technical solution of the present application and the measurement data of the prior art solution, see Tables 1 to 4.

[0162] It can be seen from Table 1 that the technical solution of Example 5 of the present application is better than the measurement effect of the existing technical solution, and the measurement result using the technical solution of the present application is more accurate.

[0163] Table 1: Comparison of loop resistance values ​​using the current line expansion method

[0164]

[0165] It can be seen from Table 2 that the technical solution of Example 6 of the present application is better than the measurement effect of the existing technical solution, and the measurement result using the technical solution of the present application is more accurate.

[0166] Table 2: Comparison of loop resistance values ​​using voltage line expansion method

[0167]

[0168] It can be seen from Table 3 that the technical solution of Example 7 of the present application is better than the measurement effect of the existing technical solution, and the measurement result using the technical solution of the present application is more accurate.

[0169] Table 3: Comparison of loop resistance values ​​of ground grid diversion method

[0170]

[0171] It can be seen from Table 4 that the technical solution of Example 8 of the present application is better than the measurement effect of the existing technical solution, and the measurement result using the technical solution of the present application is more accurate.

[0172] Table 4: Comparison of loop resistance values ​​of adjacent phase diversion method

[0173]

[0174] After this application was run internally for a period of time, the on-site technicians reported that the application was beneficial in the following ways:

[0175] The busbar loop resistance can be accurately tested to eliminate the interference of the ground knife on the test.

[0176] At present, the technical solution of the present invention has been put into pilot production, that is, a small-scale test of the product before large-scale mass production; after the pilot production was completed, a user usage survey was carried out in a small range, and the survey results showed that user satisfaction was high; now preparations have begun for the formal production of the product for industrialization (including intellectual property risk warning survey).

Claims

1. A device for measuring busbar loop resistance, comprising a loop resistance tester, wherein a first pair of measuring wires of the loop resistance tester is connected to a measuring point of a ground switch at a junction of a busbar to be tested and a switch, and characterized in that: The second pair of measuring lines of the loop resistance tester are connected to the measuring point of the earth switch outside the busbar to be tested. The loop resistance tester includes a first current output terminal I+, a second current output terminal I-, a first measurement input terminal V+ and a second measurement input terminal V-. The first current output terminal I+ and the second current output terminal I- are a pair, and the first measurement input terminal V+ and the second measurement input terminal V- are a pair.

2. The device for measuring busbar loop resistance according to claim 1, characterized in that: The first current output terminal I+ of the loop resistance tester is connected to the measuring point of the grounding switch outside the bus to be tested on the first switch side, the first measuring input terminal V+ of the loop resistance tester is connected to the measuring point of the grounding switch at the junction of the bus to be tested and the first switch, the second measuring input terminal V- of the loop resistance tester is connected to the measuring point of the grounding switch at the junction of the bus to be tested and the second switch, and the second current output terminal I- of the loop resistance tester is connected to the measuring point of the grounding switch outside the bus to be tested on the second switch side.

3. The device for measuring busbar loop resistance according to claim 1, characterized in that: The first measurement input terminal V+ of the loop resistance tester is connected to the measuring point of the grounding switch outside the bus to be tested on the first switch side, the first current output terminal I+ of the loop resistance tester is connected to the measuring point of the grounding switch at the junction of the bus to be tested and the first switch, the second current output terminal I- of the loop resistance tester is connected to the measuring point of the grounding switch at the junction of the bus to be tested and the second switch, and the second measurement input terminal V- of the loop resistance tester is connected to the measuring point of the grounding switch outside the bus to be tested on the second switch side.

4. The device for measuring busbar loop resistance according to claim 1, characterized in that: The measuring line of the loop resistance tester is connected to the measuring point of the ground switch at the junction of the busbar to be tested and the switch through the ground grid.

5. The device for measuring busbar loop resistance according to claim 4, characterized in that: The first measurement input terminal V+ of the loop resistance tester is connected to the measuring point of the earth switch outside the bus to be tested on the first switch side, the first current output terminal I+ of the loop resistance tester is connected to the measuring point of the earth switch at the junction of the bus to be tested and the first switch, the second current output terminal I- of the loop resistance tester is connected to the measuring point of the earth switch at the junction of the bus to be tested and the second switch via the ground network, and the second measurement input terminal V- of the loop resistance tester is connected to the measuring point of the earth switch outside the bus to be tested on the second switch side.

6. The device for measuring busbar loop resistance according to claim 1, characterized in that: One measuring line of the first pair of measuring lines of the loop resistance tester is connected to the measuring point of the ground switch at the junction of the busbar to be tested of the first phase and the first switch, the other measuring line of the first pair of measuring lines of the loop resistance tester is connected to the measuring point of the ground switch at the junction of the busbar to be tested of the second phase and the first switch, one measuring line of the second pair of measuring lines of the loop resistance tester is connected to the measuring point of the ground switch outside the busbar to be tested on the first switch side of the first phase, the other measuring line of the second pair of measuring lines of the loop resistance tester is connected to the measuring point of the ground switch outside the busbar to be tested on the second switch side of the first phase, and the measuring point of the ground switch at the junction of the busbar of the first phase and the second switch is connected to the measuring point of the ground switch at the junction of the busbar of the second phase and the second switch.

7. The device for measuring busbar loop resistance according to claim 6, characterized in that: The first measurement input terminal V+ of the loop resistance tester is connected to the measurement point of the grounding switch outside the busbar to be tested on the first switch side of phase B, the first current output terminal I+ of the loop resistance tester is connected to the measurement point of the grounding switch at the junction of the busbar to be tested of phase B and the first switch, the second current output terminal I- of the loop resistance tester is connected to the measurement point of the grounding switch at the junction of the busbar of phase A to be tested and the first switch, the second measurement input terminal V- of the loop resistance tester is connected to the measurement point of the grounding switch outside the busbar to be tested on the second switch side of phase B, the measurement point of the grounding switch at the junction of the busbar of phase A and the second switch is connected to the measurement point of the grounding switch at the junction of the busbar of phase B and the second switch.

8. A method for measuring busbar loop resistance, characterized in that: The device for measuring bus loop resistance according to any one of claims 1 to 7 comprises the following steps: closing the earth switches on the bus to be measured, opening the knife switches on the bus to be measured, and measuring and obtaining data on the bus loop resistance.

9. The method for measuring bus loop resistance according to claim 8, characterized in that: When the measuring line of the loop resistance tester is connected to the measuring point of the grounding knife at the junction of the busbar to be tested and the knife switch through the grounding grid, the grounding knife is continuously grounded.

Images