CN216082927U - Resistance measuring device suitable for circuit breaker or isolating switch under high electric field intensity - Google Patents
Resistance measuring device suitable for circuit breaker or isolating switch under high electric field intensity Download PDFInfo
- Publication number
- CN216082927U CN216082927U CN202122677047.XU CN202122677047U CN216082927U CN 216082927 U CN216082927 U CN 216082927U CN 202122677047 U CN202122677047 U CN 202122677047U CN 216082927 U CN216082927 U CN 216082927U
- Authority
- CN
- China
- Prior art keywords
- resistance
- circuit breaker
- resistor
- grounding
- tested
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model provides a resistance measuring device suitable for a circuit breaker or a disconnecting switch under high electric field intensity, which comprises: a first ground resistor, a second ground resistor, a resistance tester, and a test lead; one end of the first grounding resistor is configured to be grounded, and the other end of the first grounding resistor is configured to be electrically connected with a first end of a circuit breaker or a disconnecting switch to be tested; one end of the second grounding resistor is configured for grounding, and the other end of the second grounding resistor is configured for being electrically connected with the second end of the circuit breaker or the isolating switch to be tested; the resistance test instrument is provided with a relevant wiring terminal; the test lead is configured to be electrically connected with a related terminal on the resistance test instrument and configured to be electrically connected with two ends of a circuit breaker or a disconnecting switch to be tested. The utility model is used for solving the problem that the safety of the resistance measurement process of the breaker or the disconnecting switch is lower due to high induction voltage under the existing high-voltage condition.
Description
Technical Field
The utility model relates to the field of circuit breakers or isolating switches, in particular to a resistance measuring device suitable for circuit breakers or isolating switches under high electric field intensity.
Background
In the operation process of the power system, in order to safely and effectively transmit electric energy from a power plant to a user terminal, the electric energy needs to be subjected to treatment such as voltage boosting and voltage reducing in the middle. In this process, circuit breakers and disconnectors play an important role. The main functions of the circuit breaker are as follows: when the circuit is normally operated, the circuit is used for switching the operation mode, and equipment or a line is connected into the circuit or quit the operation to play a control role; when equipment or a line has a fault, the fault loop can be quickly cut off, and the normal operation of the fault-free part is protected, so that the protection effect is achieved. The circuit is characterized in that the circuit can cut off load current and short-circuit current in the circuit and has the capability of extinguishing electric arcs. The main functions of the isolating switch include: 1) isolation voltage: when electrical equipment is overhauled, isolating the overhauled equipment from power supply voltage by using an isolating switch; 2) switching operation, namely switching in a standby bus or a bypass bus and changing the operation mode, and completing the operation by cooperating with a breaker; 3) dividing and combining small current: the disconnector has no arc extinguishing device and can not be used for switching on load current and switching off barrier current, but has the capability of dividing and combining small inductive current (not more than 2A) and capacitive current (not more than 5A).
In order to test the performance of circuit breakers and disconnectors, conductive loop resistance measurements are required of the circuit breaker and disconnector contacts and their electrical connections. When the measurement is carried out, the measurement is carried out under the condition that the circuit breaker or the disconnecting switch has power failure, because other equipment (such as a bus, a lightning arrester, a voltage transformer, a current transformer, other disconnecting switches, circuit breakers and the like) still operates under high voltage, the measured circuit breaker and disconnecting switch can induce higher voltage, generally, induced high voltage of kilovolt or even tens of thousands of volts can be induced, the specific numerical value is determined by parasitic capacitance of the space distance between the measured circuit breaker and disconnecting switch loop and the live equipment and the ground and the voltage grade of the live equipment, and the induced voltage has great influence on testers and test equipment. And the related lead wires need to be frequently connected or replaced in the measuring process, and the existence of the high induction voltage causes great potential safety hazard in the process.
SUMMERY OF THE UTILITY MODEL
In view of the above disadvantages of the prior art, the present invention provides a resistance measuring device suitable for a circuit breaker or a disconnector under high electric field strength, so as to solve the problem of low safety of the circuit breaker or the disconnector in the resistance measuring process due to high induced voltage under the existing high voltage condition.
To achieve the above and other related objects, the present invention provides a resistance measuring device for a circuit breaker or a disconnector at high electric field strength, comprising: a first ground resistor, a second ground resistor, a resistance tester, and a test lead; one end of the first grounding resistor is configured to be grounded, and the other end of the first grounding resistor is configured to be electrically connected with a first end of a circuit breaker or a disconnecting switch to be tested; one end of the second grounding resistor is configured for grounding, and the other end of the second grounding resistor is configured for being electrically connected with the second end of the circuit breaker or the isolating switch to be tested; the resistance test instrument is provided with a relevant wiring terminal; the test lead is configured to be electrically connected with a related terminal on the resistance test instrument and configured to be electrically connected with two ends of a circuit breaker or a disconnecting switch to be tested.
In an embodiment of the present invention, the range of the resistance value R of the first ground resistor or the resistance value R of the second ground resistor is: r is more than or equal to 20 ohm and less than or equal to 200 ohm.
In an embodiment of the present invention, a resistance value of the first ground resistor is the same as a resistance value of the second ground resistor.
In an embodiment of the present invention, the first ground resistor has a resistance of 100 ohms.
In one embodiment of the present invention, the test leads include voltage leads and current leads, and the associated terminals include current lead terminals and voltage lead terminals.
In an embodiment of the utility model, an alligator clip is arranged on the lead for testing.
In one embodiment of the present invention, the test lead includes a conductor portion and an insulating portion; the insulating part is coated on the periphery of the conductor part, and the conductor part is composed of a plurality of strands of copper wires.
In an embodiment of the present invention, the first ground resistor and/or the second ground resistor is a ground line.
The resistance measuring device is suitable for the circuit breaker or the isolating switch under high electric field intensity, the first grounding resistor or the second grounding resistor eliminates the induced voltage of a conductive loop with the measuring circuit breaker or the isolating switch, so that the connection or the replacement of related wires can be carried out without closing the grounding switch, the potential safety hazard is reduced, and the safety of workers is ensured; meanwhile, the test equipment is prevented from being damaged due to the impact of the induction voltage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the resistance measuring device of the present invention for a circuit breaker or a disconnector under high electric field strength;
fig. 2 is a circuit connection diagram of a circuit breaker and a disconnecting switch of the 500KV booster station.
Description of the reference symbols
100. A first ground resistor; 200. a second ground resistor; 300. a resistance testing instrument; 400. a lead for testing; 401. a voltage lead; 402. a current lead; 500. a circuit breaker or disconnector to be tested.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.
It should be understood that the terms "upper", "lower", "left", "right", "middle" and "one" used herein are for clarity of description only, and are not intended to limit the scope of the utility model, and that changes or modifications in the relative relationship may be made without substantial technical changes and modifications.
Referring to fig. 1, the present invention provides a resistance measuring device for a circuit breaker or a disconnector at a high electric field strength, which is used for measuring the contact resistance of a conductive loop of the circuit breaker or the disconnector at a high electric field strength, and the device includes: a first ground resistor 100, a second ground resistor 200, a resistance testing instrument 300, and a test lead 400; one end of the first grounding resistor 100 is grounded, and the other end is configured to be electrically connected with a first end of a circuit breaker or a disconnecting switch 500 to be tested; one end of the second grounding resistor 200 is grounded, and the other end is configured to be electrically connected with a second end of the circuit breaker or the isolating switch 500 to be tested; the resistance testing instrument 300 is provided with relevant terminals; the test leads 400 are configured to electrically connect to associated terminals on the resistance testing apparatus 300 and are configured to electrically connect two ends of a circuit breaker or disconnector 500 to be tested.
The high electric field intensity is an electric field intensity radiated when the voltage of the relevant equipment is greater than or equal to 110KV, and the relevant equipment is equipment capable of radiating an electric field in the environment where the circuit breaker or the isolating switch 500 to be tested is located, such as a bus, a lightning arrester, a voltage transformer, a current transformer, other isolating switches and circuit breakers in a booster station.
The first grounding switch and the second grounding switch can effectively eliminate induced voltage on the circuit breaker or the isolating switch to be measured. In an embodiment of the present invention, the range of the resistance value R of the first ground resistor 100 or the resistance value R of the second ground resistor 200 is: r is more than or equal to 20 ohm and less than or equal to 200 ohm. The magnitude of the circuit resistance of the circuit breaker is microohm (generally about 80 microohm), the magnitude of the circuit resistance of the isolating switch is milliohm (generally about 300 milliohm), and the resistance value R range is 20 ohm which is less than or equal to R which is less than or equal to 200 ohm and is far larger than the circuit resistance of the circuit breaker or the isolating switch.
In an embodiment of the present invention, the resistance of the first ground resistor 100 is the same as the resistance of the second ground resistor 200. The resistance values of the two grounding resistors are consistent, two ends do not need to be distinguished in the connection process, convenience in the connection process is improved, and detection efficiency is improved. For example, the first ground resistor 100 has a resistance of 100 ohms.
When the device is used for measuring the resistance of the circuit breaker or the isolating switch, the first grounding switch is connected with the first grounding resistor 100 in parallel; the second ground switch is connected in parallel with the second ground resistor 200. The first grounding switch is connected in parallel with the first grounding resistor 100, so that the safety of an operator or a measuring instrument can be ensured without closing the first grounding switch when connecting or replacing the relevant line. The second grounding switch is connected in parallel with the second grounding resistor 200, so that the safety of an operator or a measuring instrument can be ensured without closing the second grounding switch when connecting or replacing the relevant line.
In one embodiment of the present invention, the test lead 400 includes a voltage lead 401 and a current lead 402. The two ends of the circuit breaker or the isolating switch 500 to be tested are respectively connected with a voltage lead and a current lead, and the other end of each voltage lead or current lead is correspondingly connected to an interface on the resistance testing instrument 300.
In one embodiment of the present invention, an alligator clip is disposed on the test lead 400. The alligator clip is used to connect the lead to both ends of the circuit breaker or disconnector 500 to be tested.
In an embodiment of the present invention, the test lead 400 includes a conductor portion and an insulation portion; the insulating part is coated on the periphery of the conductor part, and the conductor part is composed of a plurality of strands of copper wires.
In an embodiment of the present invention, the first ground resistor 100 and/or the second ground resistor 200 is a ground wire, and the ground wire is a wire with a resistance value meeting the above definition.
In an embodiment of the present invention, the first ground resistor 100 and/or the second ground resistor 200 are integrated in the resistance testing apparatus 300, the ground terminal thereof is reliably grounded or reliably grounded before use, and the terminal thereof connected to the resistor to be tested can be electrically connected to a port to be connected, which is disposed on the surface of the resistance testing apparatus. In another embodiment, the ends of the first and second grounding resistors 200 to be tested are directly led out through a lead, and an alligator clip is arranged at the end of the lead.
The using process of the utility model is as follows: one end of the first grounding resistor 100 is grounded and the other end is electrically connected to a first end of a circuit breaker or a disconnector 500 to be tested. One end of the second grounding resistor 200 is grounded, and the other end is electrically connected to the second end of the circuit breaker or the isolating switch 500 to be tested. Two ends of the circuit breaker or the isolating switch 500 to be tested are respectively connected with a lead 400 for testing; correspondingly connecting the test leads 400 to the resistance testing apparatus 300; the first grounding switch and the second grounding switch are disconnected, and the resistance value of the circuit breaker or the isolating switch 500 to be tested is obtained by using the resistance testing instrument 300. The step of obtaining the resistance value of the circuit breaker or the isolating switch 500 to be tested by using the resistance testing instrument 300 includes: grounding the shell of the resistance testing instrument 300, and then switching on the power supply of the testing instrument to obtain the resistance value of the circuit breaker or the isolating switch 500 to be tested. The step of connecting the test lead 400 to both ends of the circuit breaker or the isolating switch 500 to be tested includes: the test lead 400 is connected to both ends of the circuit breaker or disconnector 500 to be tested with dedicated test clamps. The dedicated test jaw may be an alligator clip.
In an embodiment of the present invention, before the step of connecting the first ground resistor 100 to one end of the circuit breaker or the disconnector 500 to be tested, the method further includes: and detecting whether the operator meets the safe operation standard or not, and entering the next step only under the condition that the operator meets the safe operation standard. The operator can be a worker, and can also be an intelligent operation device or a robot. When the operator is a worker, the corresponding safety operation standards are as follows: and (4) confirming that the equipment has power failure and making safety measures, wherein an operator needs to wear insulating shoes and insulating gloves to keep a sufficient safety distance with other running equipment, and is monitored by a specially-assigned person. In an embodiment of the present invention, before the step of detecting whether the operator meets the safety operation standard, the method further includes transacting a work ticket to obtain the operation authority.
In an embodiment of the present invention, the step of obtaining the resistance value of the circuit breaker or the disconnecting switch 500 to be tested by using the resistance testing apparatus 300 further includes: and closing the first grounding switch and the second grounding switch, taking down the first grounding resistor 100 and the second grounding resistor 200, taking down the test lead 400 at two ends of the circuit breaker or the isolating switch 500 to be tested, and taking down the test lead 400 on the resistance test instrument 300.
In an embodiment of the present invention, the first ground resistor 100 or the second ground resistor 200 may be a wire having a resistance value meeting a predetermined condition, or may be a separate resistor having a certain mechanical strength and a sufficient thermal capacity. The first ground resistor 100, the second ground resistor 200 and the test lead 400 should be protected by an insulating sheath, the lead should have sufficient cross-sectional area and mechanical strength, and the lead should be made of stranded copper wire.
Specifically, taking a 500KV booster station as an example, referring to fig. 2, the method for measuring 5023 circuit breaker conductive loop resistance is as follows:
1) and (5) transacting the work ticket, confirming that the equipment is powered off and making safety measures.
2) Workers should wear insulating shoes and insulating gloves, keep enough safety distance with other running equipment and be monitored by special persons.
3) Turning on 5023 circuit breaker, connecting 502317/502327 grounding switches at two ends of 5023 circuit breaker conductive loop to be measured, connecting a resistor (R1/R2, generally about 100 ohms) with resistance value far greater than that of 5023 circuit breaker conductive loop to ground, and clamping voltage and current leads of the conductive loop contact resistance tester at two ends of 5023 circuit breaker conductive loop by using special test clamps; the much larger may be a resistance value of 1000 times or more.
4) The voltage and current leads are connected to the loop resistance test instrument and the ground switch is pulled 502317/502327 open.
5) The shell of the loop resistance test instrument is reliably grounded, and a power supply of the test instrument is connected to carry out loop resistance test.
6) After the test is finished, closing 502317/502327 grounding switch, taking down and connecting the resistor (R1/R2) at the two ends of the circuit breaker conductive loop to be measured, and simultaneously taking down the voltage and current lead wire of the conductive loop contact resistance test instrument and testing the voltage and current lead wire.
7) And (5) finishing the test.
50231 testing method for the contact resistance of the conductive loop of the isolating switch comprises the following steps:
1) and (5) transacting the work ticket, confirming that the equipment is powered off and making safety measures.
2) Workers should wear insulating shoes and insulating gloves, keep enough safety distance with other running equipment and be monitored by special persons.
3) 50231 isolating switch is closed, 502317/5023617 grounding switches at two ends of a 50231 isolating switch conducting loop are respectively connected with a resistor (R2/R3, generally about 100 ohms) with the resistance value more than 1000 times that of a 5023 breaker conducting loop to be grounded, and voltage and current leads of a conducting loop contact resistance testing instrument are clamped at two ends of the 50231 isolating switch conducting loop through special testing clamps.
4) The voltage and current leads are connected to the loop resistance test instrument and the switches 502317, 5023617 are pulled open.
5) The shell of the loop resistance test instrument is reliably grounded, and a power supply of the test instrument is connected to carry out loop resistance test.
6) After the test is finished, 502317 and 5023617 grounding switches are closed, resistors (R2/R3) at two ends of a conductive circuit of the circuit breaker to be measured are removed and connected, voltage and current leads of a conductive circuit contact resistance test instrument are also removed, and voltage and current leads are tested.
7) And (5) finishing the test.
Referring to FIG. 2, FIG. 2 shows the principle of resistance measurement of the present invention, the first ground resistance RGround 1And a second ground resistance RGround 2Each grounding is equivalent to that the first grounding resistor 100 and the second grounding resistor 200 are connected in series from the grounding end and then connected in parallel to the two ends of the circuit breaker or the isolating switch 500 to be tested, and the resistance value measured by the conductive loop is the total resistance:
therefore, the utility model can ensure the accuracy of the measuring result. In fig. 2, D1, D2 are used to connect the voltage lead 401, and C1, C2 are used to connect the current lead 402.
The utility model is suitable for the resistance measuring device of the circuit breaker or the isolating switch under high electric field intensity, the first grounding resistor 100 or the second grounding resistor 200 eliminates the induction voltage of the conductive loop of the circuit breaker or the isolating switch 500 to be measured, thereby the connection or the replacement of related wires can be carried out without closing the grounding switch, the potential safety hazard is reduced, and the safety of workers is ensured; meanwhile, the test equipment is prevented from being damaged due to the impact of the induction voltage; in addition, since the resistance values of the first ground resistor 100 and the second ground resistor 200 meet the predetermined conditions, the accuracy of the measurement result can be ensured. Therefore, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. A resistance measuring device suitable for a circuit breaker or a disconnector at high electric field strengths, comprising:
the first grounding resistor is used for grounding at one end and electrically connected with the first end of the circuit breaker or the isolating switch to be tested at the other end;
one end of the second grounding resistor is configured to be grounded, and the other end of the second grounding resistor is configured to be electrically connected with the second end of the circuit breaker or the isolating switch to be tested;
the resistance testing instrument is provided with a relevant wiring terminal;
and the test lead is configured to be electrically connected with the relevant wiring terminal on the resistance test instrument and is configured to be electrically connected with two ends of the circuit breaker or the isolating switch to be tested.
2. The resistance measuring device of claim 1, wherein the resistance value R of the first ground resistor or the resistance value R of the second ground resistor is in the range of: r is more than or equal to 20 ohm and less than or equal to 200 ohm.
3. The resistance measuring device of claim 2, wherein the first ground resistor has the same resistance as the second ground resistor.
4. The apparatus of claim 3, wherein the first ground resistor has a resistance of 100 ohms.
5. The resistance measuring device of claim 1, wherein the test leads comprise voltage leads and current leads, and the associated terminals comprise current lead terminals and voltage lead terminals.
6. The device of claim 1, wherein the test lead is provided with an alligator clip.
7. The apparatus of claim 1, wherein the test lead comprises a conductor portion and an insulation portion; the insulating part is coated on the periphery of the conductor part, and the conductor part is composed of a plurality of strands of copper wires.
8. The apparatus of claim 1, wherein the first ground resistor and/or the second ground resistor is a ground line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122677047.XU CN216082927U (en) | 2021-11-03 | 2021-11-03 | Resistance measuring device suitable for circuit breaker or isolating switch under high electric field intensity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122677047.XU CN216082927U (en) | 2021-11-03 | 2021-11-03 | Resistance measuring device suitable for circuit breaker or isolating switch under high electric field intensity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216082927U true CN216082927U (en) | 2022-03-18 |
Family
ID=80643837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122677047.XU Active CN216082927U (en) | 2021-11-03 | 2021-11-03 | Resistance measuring device suitable for circuit breaker or isolating switch under high electric field intensity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216082927U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023077533A1 (en) * | 2021-11-03 | 2023-05-11 | 华能国际电力股份有限公司德州电厂 | Resistance measurement method suitable for circuit breaker or isolating switch under high electric field intensity |
-
2021
- 2021-11-03 CN CN202122677047.XU patent/CN216082927U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023077533A1 (en) * | 2021-11-03 | 2023-05-11 | 华能国际电力股份有限公司德州电厂 | Resistance measurement method suitable for circuit breaker or isolating switch under high electric field intensity |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100709980B1 (en) | Method and apparatus for detecting a fault section using comparison of phase difference and magnitude difference bewteen zero phase currents in ungrounded distribution power systems | |
| EP1391740B1 (en) | High-voltage insulated modular connection system with current and voltage acquisition | |
| CN216082927U (en) | Resistance measuring device suitable for circuit breaker or isolating switch under high electric field intensity | |
| CN111157941A (en) | Device and method for quickly switching and checking primary winding of power transformer | |
| CN209707671U (en) | Transformer station direct current system resistance test device over the ground | |
| CN101403779A (en) | Parameter measuring apparatus and system for high tension power line | |
| CN211826457U (en) | Quick switching calibration device for primary winding of power transformer | |
| JP5545738B2 (en) | Current transformer secondary open circuit, electrical panel and test plug | |
| CN218896185U (en) | Auxiliary device for voltage transformer test | |
| CN215768853U (en) | Secondary cable core insulation measurement auxiliary device | |
| CN114019245A (en) | Resistance measuring method suitable for circuit breaker or disconnecting switch under high electric field intensity | |
| CN110673061A (en) | Composite portable short circuit grounding wire with self-detection function | |
| CN107132463B (en) | Short circuit preventing device for secondary winding of voltage transformer | |
| CN212989429U (en) | Power transformer high-voltage lead switching system | |
| RU2640315C1 (en) | Adjustable capacitive sensor of high voltage | |
| CN114740344A (en) | Impedance angle deviation-based alternating current breaker step difference coordination test method and system | |
| CN209765018U (en) | generator stator rotor grounding test device | |
| JPH08122400A (en) | Withstand voltage testing system for power cable | |
| CN219829960U (en) | Test system for gas-insulated switchgear | |
| CN213482405U (en) | A divide and present electric leakage experiment detection device for feed switch | |
| CN221199839U (en) | Insulation detection device for testing multi-point device | |
| CN213302451U (en) | Anti-static/induction device | |
| CN216595469U (en) | Point inspection line for power line test equipment | |
| CN218917523U (en) | Leakage protector test pen | |
| CN217655188U (en) | Detection apparatus for non-repeatability transient state heavy current |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |