CN111521874B - Loop resistance testing method and device for static contact of isolating switch - Google Patents
Loop resistance testing method and device for static contact of isolating switch Download PDFInfo
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- CN111521874B CN111521874B CN202010392934.XA CN202010392934A CN111521874B CN 111521874 B CN111521874 B CN 111521874B CN 202010392934 A CN202010392934 A CN 202010392934A CN 111521874 B CN111521874 B CN 111521874B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The embodiment of the invention discloses a method and a device for testing loop resistance of a static contact of an isolating switch. The method for testing the loop resistance of the static contact of the isolating switch comprises the following steps: obtaining at least one of a first set of resistance values and a second set of resistance values, wherein the first set of resistance values comprises: first return circuit resistance between first support adapting unit and the load-bearing member to and second return circuit resistance between second support adapting unit and the load-bearing member, the second group resistance includes: a third loop resistor between the first support connecting part and the static contact rod, and a fourth loop resistor between the second support connecting part and the static contact rod; and determining whether the loop resistance of the static contact is qualified or not according to at least one of the first group of resistance values and the second group of resistance values. The technical scheme provided by the embodiment of the invention can accurately judge whether the loop resistance of the static contact is qualified or not, and avoid the occurrence of misjudgment caused by poor contact of the soft connection at one side of the static contact.
Description
Technical Field
The invention relates to the technical field of testing, in particular to a method and a device for testing loop resistance of a static contact of an isolating switch.
Background
The isolating switch is one of power equipment widely used in a transformer substation, can be used for isolating a power supply and switching operation, and has very important functions in a power system. The isolating switch can comprise a static contact, a main disconnecting link, an operation porcelain bottle, a supporting porcelain bottle, a base and the like which are sequentially arranged from top to bottom.
The circuit resistance is an important technical index for reflecting the quality and the running state of the isolating switch. However, when the loop resistance of the two ends of the static contact of the isolating switch is measured to judge whether the loop resistance of the static contact of the isolating switch is qualified, the problem of misjudgment exists.
Disclosure of Invention
The embodiment of the invention provides a method and a device for testing loop resistance of a static contact of an isolating switch, which are used for accurately judging whether the loop resistance of the static contact is qualified or not, so that the situation that the safe operation of the isolating switch is seriously influenced because the difference between the overall resistance value and the normal resistance value is not large when one of two parallel soft connections is in poor contact with the connection part of a static contact rod and a cross arm aluminum plate and the resistance value of the other soft connection is normal, and the measured overall loop resistance of the static contact is mistakenly considered to be qualified, but the actual local loop resistance is unqualified, so that the local heating of the static contact is caused can be avoided.
In a first aspect, an embodiment of the present invention provides a method for testing a loop resistance of a fixed contact of an isolation switch, where the fixed contact includes: the bus-bar clamp, the carrier, quiet feeler lever, first support adapting unit and second support adapting unit, the bus-bar clamp is fixed on the carrier, the carrier sets up with quiet feeler lever interval, the first end of carrier is connected with the first end of first support adapting unit, the second end of first support adapting unit is connected with the first end of quiet feeler lever, the second end of carrier is connected with the first end of second support adapting unit, the second end of second support adapting unit is connected with the second end of quiet feeler lever, the test method includes:
obtaining at least one of a first group of resistance values and a second group of resistance values, wherein the first group of resistance values comprises: first return circuit resistance between first support adapting unit and the load-bearing member to and second return circuit resistance between second support adapting unit and the load-bearing member, the second group resistance includes: a third loop resistor between the first support connecting part and the static contact rod, and a fourth loop resistor between the second support connecting part and the static contact rod;
and determining whether the loop resistor of the static contact is qualified or not according to at least one of the first group of resistance values and the second group of resistance values.
Further, obtaining at least one of the first and second sets of resistances comprises: obtaining a first group of resistance values;
determining whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values comprises:
and if the ratio of the difference value between the maximum value and the minimum value in the first loop resistance and the second loop resistance to the minimum value in the first loop resistance and the second loop resistance is greater than or equal to a first threshold value, determining that the larger loop resistance in the first loop resistance and the second loop resistance is unqualified.
Further, obtaining at least one of the first and second sets of resistance values includes: obtaining a second group of resistance values;
determining whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values comprises:
and if the ratio of the difference value of the maximum value and the minimum value in the third loop resistance and the fourth loop resistance to the minimum value in the third loop resistance and the fourth loop resistance is greater than or equal to a second threshold value, determining that the larger loop resistance in the third loop resistance and the fourth loop resistance is unqualified.
Further, before determining whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values, the method further includes:
acquiring an integral loop resistor between the bus clamp and the static contact rod;
correspondingly, if the integral loop resistance is within the third threshold range, whether the loop resistance of the static contact is qualified or not is determined according to at least one of the first group of resistance values and the second group of resistance values.
Further, still include: and if the integral loop resistance is not in the third threshold range, determining that the loop resistance of the static contact is unqualified.
Further, obtaining at least one of the first and second sets of resistances comprises: acquiring a first group of resistance values and a second group of resistance values;
determining whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values comprises:
and if the ratio of the difference value between the maximum value and the minimum value in the first loop resistor and the second loop resistor to the minimum value in the first loop resistor and the second loop resistor is smaller than a first threshold value, and the ratio of the difference value between the maximum value and the minimum value in the third loop resistor and the fourth loop resistor to the minimum value in the third loop resistor and the fourth loop resistor is smaller than a second threshold value, determining that the loop resistor of the static contact is qualified.
Furthermore, the first end of the bearing part is detachably connected with the first end of the first support connecting part, the second end of the first support connecting part is detachably connected with the first end of the static contact rod, the second end of the bearing part is detachably connected with the first end of the second support connecting part, and the second end of the second support connecting part is detachably connected with the second end of the static contact rod.
In a second aspect, an embodiment of the present invention further provides a device for testing a loop resistance of a fixed contact of an isolating switch, where the fixed contact includes: the generating line presss from both sides, bearing part, the stationary contact pole, first support adapting unit and second support adapting unit, the generating line presss from both sides to be fixed on bearing part, bearing part sets up with stationary contact pole interval, bearing part's first end is connected with first support adapting unit's first end, first support adapting unit's second end is connected with stationary contact pole's first end, bearing part's second end is connected with second support adapting unit's first end, the second supports adapting unit's second end and is connected with stationary contact pole's second end, testing arrangement includes:
the first obtaining module is used for obtaining at least one of a first group of resistance values and a second group of resistance values, wherein the first group of resistance values comprise: first return circuit resistance between first support adapting unit and the load-bearing member to and second return circuit resistance between second support adapting unit and the load-bearing member, the second group resistance includes: a third loop resistor between the first support connecting part and the static contact rod, and a fourth loop resistor between the second support connecting part and the static contact rod;
and the determining module is used for determining whether the loop resistance of the static contact is qualified or not according to at least one of the first group of resistance values and the second group of resistance values.
Further, the first obtaining module is used for obtaining a first group of resistance values;
the determining module is used for determining that the larger loop resistance in the first loop resistance and the second loop resistance is unqualified if the ratio of the difference value between the maximum value and the minimum value in the first loop resistance and the second loop resistance to the minimum value in the first loop resistance and the second loop resistance is larger than or equal to a first threshold value;
alternatively, the first and second electrodes may be,
the first obtaining module is used for obtaining a second group of resistance values;
the determining module is used for determining that the larger loop resistance in the third loop resistance and the fourth loop resistance is unqualified if the ratio of the difference value between the maximum value and the minimum value in the third loop resistance and the fourth loop resistance to the minimum value in the third loop resistance and the fourth loop resistance is larger than or equal to a second threshold value.
Further, still include: the second obtaining module is used for obtaining the whole loop resistance between the bus clamp and the static contact rod before the determining module determines whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values;
correspondingly, the determining module is used for determining whether the loop resistance of the static contact is qualified or not according to at least one of the first group of resistance values and the second group of resistance values if the overall loop resistance is within the third threshold range;
the first obtaining module is used for obtaining a first group of resistance values and a second group of resistance values;
the determining module is used for determining that the loop resistance of the static contact is qualified if the ratio of the difference value between the maximum value and the minimum value of the first loop resistance and the second loop resistance to the minimum value of the first loop resistance and the second loop resistance is smaller than a first threshold value, and the ratio of the maximum value and the minimum value of the difference value between the third loop resistance and the fourth loop resistance to the minimum value of the third loop resistance and the fourth loop resistance is smaller than a second threshold value;
the determining module is further used for determining that the loop resistance of the static contact is unqualified if the overall loop resistance is not within the third threshold range.
In the technical scheme of the embodiment of the invention, at least one of a first group of resistance values and a second group of resistance values is obtained, wherein the first group of resistance values comprises: first return circuit resistance between first support adapting unit and the load-bearing member to and second return circuit resistance between second support adapting unit and the load-bearing member, the second group resistance includes: a third loop resistor between the first support connecting part and the static contact rod, and a fourth loop resistor between the second support connecting part and the static contact rod; and determining whether the loop resistance of the static contact is qualified or not according to at least one of the first group of resistance values and the second group of resistance values, and accurately testing that the loop resistance of the static contact is unqualified when poor contact exists on one side of the static contact, so as to avoid the occurrence of misjudgment caused by judging whether the loop resistance is qualified or not by measuring the overall loop resistance of the static contact.
Drawings
Fig. 1 is a flowchart of a method for testing a loop resistance of a stationary contact of an isolator according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an isolating switch according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a fixed contact of an isolating switch according to an embodiment of the present invention;
fig. 4 is an equivalent circuit diagram of a fixed contact of an isolating switch according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for testing a loop resistance of a stationary contact of an isolator according to another embodiment of the present invention;
fig. 6 is a flowchart of a method for testing a loop resistance of a stationary contact of an isolator according to another embodiment of the present invention;
fig. 7 is a flowchart of a method for testing a loop resistance of a fixed contact of an isolating switch according to another embodiment of the present invention;
fig. 8 is a flowchart of a method for testing a loop resistance of a stationary contact of an isolator according to another embodiment of the present invention;
fig. 9 is a flowchart of a method for testing a loop resistance of a fixed contact of an isolating switch according to another embodiment of the present invention;
fig. 10 is a schematic structural diagram of a circuit resistance testing device for a fixed contact of an isolating switch according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a circuit resistance testing device for a fixed contact of an isolating switch according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a loop resistance testing method for a fixed contact of an isolating switch. Fig. 1 is a flowchart of a method for testing a loop resistance of a fixed contact of an isolator according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram of an isolation switch according to an embodiment of the present invention. Fig. 3 is a schematic structural diagram of a fixed contact of an isolating switch according to an embodiment of the present invention. Fig. 4 is an equivalent circuit diagram of a fixed contact of an isolating switch according to an embodiment of the present invention. Wherein, static contact 1 includes: the bus bar clamp 11, the bearing part 12, the static contact rod 13, the first support connecting part 14 and the second support connecting part 15, the bus bar clamp 11 is fixed on the bearing part 12, the bearing part 12 and the static contact rod 13 are arranged at intervals, the first end of the bearing part 12 is connected with the first end of the first support connecting part 14 (corresponding to the joint 121 in fig. 3), the second end of the first support connecting part 14 is connected with the first end of the static contact rod 13 (corresponding to the joint 131 in fig. 3), the second end of the bearing part 12 is connected with the first end of the second support connecting part 15 (corresponding to the joint 122 in fig. 3), and the second end of the second support connecting part 15 is connected with the second end of the static contact rod 13 (corresponding to the joint 132 in fig. 3). The movable contact 2 can clamp or release the static contact rod 13 so as to realize the closing or opening of the isolating switch. The loop resistance testing method of the fixed contact of the isolating switch can be executed by a loop resistance testing device of the fixed contact of the isolating switch, the device can be realized by software and/or hardware, and the device can be integrated in equipment such as a resistance measuring instrument and the like. The test method specifically comprises the following steps:
step 110, obtaining at least one of a first group of resistance values and a second group of resistance values, wherein the first group of resistance values comprises: first return circuit resistance between first support adapting unit and the load-bearing member to and second return circuit resistance between second support adapting unit and the load-bearing member, the second group resistance includes: a third loop resistance between the first support connecting part and the stationary contact rod, and a fourth loop resistance between the second support connecting part and the stationary contact rod.
The load bearing member 12 may be a cross-arm aluminum plate, among others. The first support connection member 14 and the second support connection member 15 may be a flexible connection. Two testing ends of the resistance measuring instrument can be respectively placed on the first support connecting part 14 and the bearing part 12 to measure the first support connecting part 14 and the bearing partFirst loop resistance R between elements 12 A1 . Two testing ends of the resistance measuring instrument can be respectively placed on the second supporting and connecting part 15 and the bearing part 12 to measure a second loop resistance R between the second supporting and connecting part 15 and the bearing part 12 A2 . Two testing ends of the resistance measuring instrument can be respectively placed on the first supporting and connecting part 14 and the static contact rod 13 to measure a third loop resistance R between the first supporting and connecting part 14 and the static contact rod 13 B1 . Two testing ends of the resistance measuring instrument can be respectively placed on the second supporting and connecting part 15 and the static contact rod 13 to measure a fourth loop resistance R between the second supporting and connecting part 15 and the static contact rod 13 B2 。
Optionally, the first end of the carrier 12 is detachably connected to the first end of the first support connection 14. Optionally, the second end of the first support connecting part 14 is detachably connected to the first end of the stationary contact rod 13. Optionally, the second end of the carrier member 12 is detachably connected to the first end of the second support connection member 15. Optionally, the second end of the second support connecting part 15 is detachably connected with the second end of the stationary contact rod 13. As shown in fig. 2 to 4, the loop resistor of the whole static contact 1 includes: the resistance R7 of the bus bar clamp 1 itself, the resistance R3 of the first support connection member 14 itself, the resistance R4 of the second support connection member 15 itself, the contact resistance R1 (corresponding to the connection 121 in fig. 3) between the first support connection member 14 and the carrier member 12, the contact resistance R2 (corresponding to the connection 122 in fig. 3) between the second support connection member 15 and the carrier member 12, the contact resistance R5 (corresponding to the connection 131 in fig. 3) between the first support connection member 14 and the stationary contact bar 13, and the contact resistance R6 (corresponding to the connection 132 in fig. 3) between the second support connection member 15 and the stationary contact bar 13. The overall loop resistance R0 of the whole static contact 1, i.e. the loop resistance between the bus bar 11 and the static contact bar 13, wherein R0= R7+ (R1 + R3+ R5)/(R2 + R4+ R6), and the resistances of R3 and R4 are small and negligible, where the symbol// represents parallel connection. If the contact of each joint of the static contact 1 is good, R1 and R2 are equal in size or have little difference, R3 and R4 are equal in size or have little difference, and R5 and R6 are equal in size or have little difference; first loop resistor R A1 And a second loop resistor R A2 Are equal or not very different in size; third loop resistance R B1 And a fourth loop resistor R B2 Are equal in size or are not very different. The model of the isolating switch can be 220kVGW 16.
And step 120, determining whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values.
For example, if there is a poor contact at the connection between the first supporting and connecting part 14 and the carrier 12, or there is a poor contact at the connection between the second supporting and connecting part 15 and the carrier 12, that is, there is a poor contact at one side of the static contact 1, two testing ends of the resistance measuring instrument are respectively placed on the first supporting and connecting part 14 and the carrier 12, and a first loop resistance R between the first supporting and connecting part 14 and the carrier 12 is measured A1 Then, two testing ends of the resistance measuring instrument are respectively placed on the second supporting and connecting part 15 and the bearing part 12, and a second loop resistance R between the second supporting and connecting part 15 and the bearing part 12 is measured A2 First loop resistance R A1 And a second loop resistor R A2 The difference value between the first loop resistance and the second loop resistance is obvious in change, the difference value is larger and exceeds a fourth threshold value, and therefore the first loop resistance R is known A1 And a second loop resistor R A2 The larger value is unqualified, and the corresponding connection part (wherein, the first loop resistance R A1 Corresponding to the junction 121, a second loop resistor R A2 Corresponding to the joint 122), and the like, so as to avoid the situation that when one side of the static contact has poor contact, two testing ends of the resistance measuring instrument are respectively placed on the bus bar and the static contact rod, and whether the static contact is qualified is judged by measuring the overall loop resistance of the static contact, as the overall loop resistance changes little and is still in a qualified range, misjudgment can be caused, and then the situation that the local loop resistance is unqualified, local heating of the static contact can be caused, the safe operation of the isolating switch is seriously influenced, and the like can be caused. Wherein, if two measurements of the resistance measuring instrument are measuredThe test ends are respectively arranged on the first end of the first supporting and connecting part 14 and the bearing part 12, and the measured first loop resistance R A1 = R1// (R2 + R4+ R6+ R3+ R5). If the two testing ends of the resistance measuring instrument are respectively placed on the first end of the second supporting and connecting part 15 and the bearing part 12, the measured second loop resistance R A2 = (R2)// (R4 + R6+ R1+ R3+ R5). For example, if there is poor contact between the first support connecting member 14 and the carrier 12 and the second support connecting member 15 and the carrier 12 are in good contact, R1 is much greater than R2, for example, R1=2r2 A1 ≈R1，R A2 ≈R2，R A1 And R A2 Is approximately equal to R2, R A1 And R A2 The difference of (2) is larger and far larger than the variation of R0, the variation of R0 is the difference between R0 when one side of the static contact is in poor contact and R0 when the contact is in good contact, and the variation of R0 is smaller than half of R2.
For example, if there is a poor contact at the connection between the first supporting and connecting component 14 and the stationary contact rod 13, or there is a poor contact at the connection between the second supporting and connecting component 15 and the stationary contact rod 13, that is, there is a poor contact at one side of the stationary contact 1, the two testing ends of the resistance measuring instrument are respectively placed on the first supporting and connecting component 14 and the stationary contact rod 13, and the third loop resistance R between the first supporting and connecting component 14 and the stationary contact rod 13 is measured B1 Then, two testing ends of the resistance measuring instrument are respectively placed on the second supporting and connecting part 15 and the static contact rod 13, and a fourth loop resistance R between the second supporting and connecting part 15 and the static contact rod 13 is measured B2 Third loop resistance R B1 And a fourth loop resistor R B2 The difference between the first and second loop resistances is obviously changed, and the difference is larger and exceeds a fifth threshold value, so that the third loop resistance R is known B1 And a fourth loop resistor R B2 The larger value is not qualified, and the corresponding connection part (wherein, the third loop resistance R B1 A fourth loop resistor R corresponding to the junction 131 B2 Corresponding to the joint 132), so as to avoid the problem that when one side of the static contact has poor contact, two testing ends of the resistance measuring instrument are respectively placed on the bus clamp and the static contact rod to measure the whole loop circuit of the static contactWhen the resistance is judged to be qualified, the resistance of the whole loop is not changed greatly and still in a qualified range, the condition of misjudgment can be caused, and then the unqualified local loop resistance can cause local heating of a static contact, the safe operation of the isolating switch is seriously influenced, and the supporting connecting part on one side is not required to be disassembled so as to accurately measure the contact resistance of the supporting connecting part on the other side, so that the high-altitude operation difficulty can be reduced, and the overhauling efficiency can be improved. Wherein, if two testing ends of the resistance measuring instrument are respectively placed on the first end of the first support connecting part 14 and the static contact rod 13, the measured third loop resistance R B1 = R5+ R3// (R2 + R4+ R6+ R1). If two testing ends of the resistance measuring instrument are respectively placed on the first end of the second supporting and connecting part 15 and the static contact rod 13, the fourth loop resistance R is obtained through measurement B2 ＝(R4+R6)//(R2+R1+R3+R5)。
In the technical solution of this embodiment, at least one of the first group resistance value and the second group resistance value is obtained, wherein the first group resistance value includes: first return circuit resistance between first support adapting unit and the load-bearing member to and second return circuit resistance between second support adapting unit and the load-bearing member, the second group resistance includes: a third loop resistor between the first support connecting part and the static contact rod, and a fourth loop resistor between the second support connecting part and the static contact rod; and determining whether the loop resistance of the static contact is qualified or not according to at least one of the first group of resistance values and the second group of resistance values, and accurately testing that the loop resistance of the static contact is unqualified when poor contact exists on one side of the static contact, thereby avoiding the occurrence of misjudgment caused by judging whether the loop resistance is qualified or not by measuring the whole loop resistance of the static contact.
The embodiment of the invention provides a loop resistance testing method for a fixed contact of an isolating switch. Fig. 5 is a flowchart of a loop resistance testing method for a fixed contact of an isolating switch according to another embodiment of the present invention. On the basis of the above embodiment, the test method includes:
step 210, obtaining a first group of resistance values, wherein the first group of resistance values includes: the first loop resistance between the first support connecting part and the bearing part and the second loop resistance between the second support connecting part and the bearing part.
And step 220, if the ratio of the difference value between the maximum value and the minimum value of the first loop resistance and the second loop resistance to the minimum value of the first loop resistance and the second loop resistance is greater than or equal to a first threshold value, determining that the larger loop resistance of the first loop resistance and the second loop resistance is unqualified.
Wherein, the first loop resistance R can be compared A1 And a second loop resistor R A2 Record the value with larger value as R Amax And the smaller value is marked as R Amin If (R) Amax -R Amin )/R Amin Greater than or equal to the first threshold, then R is determined Amax Fail, and R Amax The corresponding connection part has the problems of poor contact and the like. Compared with comparative R Amax -R Amin Comparing the first threshold value with a fourth threshold value to determine whether the first threshold value is qualified or not (R) Amax -R Amin )/R Amin Whether the static contacts are qualified or not is judged by the first threshold value, so that the same first threshold value can be shared by multiple types of static contacts, and the applicability is improved. The value range of the first threshold value can be 80% -120%, when the value of the first threshold value is in the range, the judgment of whether the loop resistance is qualified is most accurate, and misjudgment caused by too small value margin can be avoided (because the judgment of whether the loop resistance is qualified has a certain margin, the loop resistance is qualified in a certain range).
The embodiment of the invention provides another loop resistance testing method for a fixed contact of an isolating switch. Fig. 6 is a flowchart of a method for testing a loop resistance of a stationary contact of an isolation switch according to another embodiment of the present invention. On the basis of the above embodiment, the test method includes:
step 310, obtaining a second set of resistance values, wherein the second set of resistance values includes: a third loop resistance between the first support connecting part and the stationary contact rod, and a fourth loop resistance between the second support connecting part and the stationary contact rod.
And 320, if the ratio of the difference value between the maximum value and the minimum value of the third loop resistance and the fourth loop resistance to the minimum value of the third loop resistance and the fourth loop resistance is greater than or equal to a second threshold value, determining that the larger loop resistance of the third loop resistance and the fourth loop resistance is unqualified.
Wherein the third loop resistance R can be compared B1 And a fourth loop resistor R B2 The one with larger value is marked as R Bmax And the smaller value is marked as R Bmin If (R) Bmax -R Bmin )/R Bmin Greater than or equal to a second threshold, then R is determined Bmax Fail, and R Bmax The corresponding connection has the problems of poor contact and the like. Compared with comparison R Bmax -R Bmin Comparing the first threshold value with a fifth threshold value to determine whether the first threshold value is qualified or not (R) Bmax -R Bmin )/R Bmin Whether the static contacts are qualified or not is judged according to the second threshold value, so that the same second threshold value can be shared by various types of static contacts, and the applicability is improved. The value range of the second threshold value can be 80% -120%, when the value of the second threshold value is in the range, the judgment of whether the loop resistance is qualified is most accurate, and misjudgment caused by too small value margin can be avoided (because the judgment of whether the loop resistance is qualified has a certain margin, the loop resistance is qualified in a certain range).
The embodiment of the invention provides another loop resistance testing method for a fixed contact of an isolating switch. Fig. 7 is a flowchart of a method for testing a loop resistance of a stationary contact of an isolation switch according to another embodiment of the present invention. On the basis of the above embodiment, the test method includes:
and step 410, acquiring the integral loop resistance between the bus clamp and the static contact rod.
Wherein, can place two test ends of resistance measurement appearance respectively on generating line presss from both sides 11 and stationary contact pole 13 to measure the whole return circuit resistance R0 between generating line clamp and the stationary contact pole.
Step 420, if the overall loop resistor is within the third threshold range, obtaining at least one of a first group of resistance values and a second group of resistance values, wherein the first group of resistance values includes: first return circuit resistance between first support adapting unit and the load-bearing member to and second return circuit resistance between second support adapting unit and the load-bearing member, the second group resistance includes: a third loop resistance between the first support connecting part and the stationary contact rod, and a fourth loop resistance between the second support connecting part and the stationary contact rod.
If the overall loop resistance R0 is within the third threshold range, it needs to be further determined whether there is a poor contact condition on one side of the static contact. The third threshold range may be set according to a product specification for the stationary contact.
And step 430, determining whether the loop resistor of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values.
Wherein a first group of resistance values and a second group of resistance values can be obtained; if the first loop resistance R A1 And a second loop resistor R A2 Maximum value R in Amax With a minimum value R Amin Difference R of Amax -R Amin And a first loop resistor R A1 And a second loop resistor R A2 Minimum value of R Amin Ratio (R) of Amax -R Amin )/R Amin Less than the first threshold, and a third loop resistance R B1 And a fourth loop resistor R B2 Maximum value of R Bmax And minimum value R Bmin Difference R of Bmax -R Bmin And a third loop resistor R B1 And a fourth loop resistor R B2 Minimum value of R Bmin Ratio of (R) Bmax -R Bmin )/R Bmin And if the current is smaller than the second threshold value, determining that the loop resistance of the static contact is qualified.
And step 440, if the overall loop resistance is not within the third threshold range, determining that the loop resistance of the static contact is unqualified.
If the overall loop resistance R0 is not within the third threshold range, it indicates that the support connection members on both sides of the static contact have poor contact and other problems.
The embodiment of the invention provides another loop resistance testing method for a fixed contact of an isolating switch. Fig. 8 is a flowchart of a method for testing a loop resistance of a fixed contact of an isolation switch according to another embodiment of the present invention. On the basis of the above embodiment, the test method includes:
step 510, obtaining an overall loop resistance between the bus clamp and the static contact rod.
And step 520, judging whether the overall loop resistance is in a third threshold range.
If the overall loop resistance is within the third threshold range, step 530 is executed. If the overall loop resistance is not within the third threshold range, step 600 is performed.
Step 530, obtaining a first set of resistance values, wherein the first set of resistance values includes: the first loop resistance between the first support connecting part and the bearing part and the second loop resistance between the second support connecting part and the bearing part.
And 540, judging whether the ratio of the difference value between the maximum value and the minimum value in the first loop resistance and the second loop resistance to the minimum value in the first loop resistance and the second loop resistance is greater than or equal to a first threshold value.
Wherein, if the first loop circuit resistor R A1 And a second loop resistor R A2 Maximum value R in Amax With a minimum value R Amin And the first loop resistance R A1 And a second loop resistor R A2 Minimum value of R Amin Ratio (R) of Amax -R Amin )/R Amin If the first threshold value is greater than or equal to the second threshold value, it indicates that one of the connection 121 of the first support connecting component 14 and the bearing component 12 and the connection 122 of the second support connecting component 15 and the bearing component 12 has poor contact, specifically, R Amax The corresponding joint is in poor contact and step 580 is performed. If the first loop resistance R A1 And a second loop resistor R A2 Maximum value R in Amax With a minimum value R Amin And the first loop resistance R A1 And a second loop resistor R A2 Minimum value of R Amin Ratio (R) of Amax -R Amin )/R Amin If the contact distance is less than the first threshold, it indicates that the contact distance between the first support connecting component 14 and the carrier 12 is good, and the contact distance between the second support connecting component 15 and the carrier 12 is good, and it is determined whether the contact distance between the first support connecting component 14 and the stationary contact bar 13 is good, and the contact distance between the second support connecting component 15 and the stationary contact bar 13 is good, and step 550 is performed.
Step 550, obtaining a second group of resistance values, wherein the second group of resistance values includes: a third loop resistance between the first support connection component and the stationary contact rod, and a fourth loop resistance between the second support connection component and the stationary contact rod.
And step 560, judging whether the ratio of the difference value between the maximum value and the minimum value in the third loop resistance and the fourth loop resistance to the minimum value in the third loop resistance and the fourth loop resistance is greater than or equal to a second threshold value.
Wherein, if the third loop resistance R B1 And a fourth loop resistor R B2 Maximum value of R Bmax With a minimum value R Bmin Difference R of Bmax -R Bmin And a third loop resistor R B1 And a fourth loop resistor R B2 Minimum value of R Bmin Ratio (R) of Bmax -R Bmin )/R Bmin Greater than or equal to a second threshold, one of the connection 131 of the first support connection part 14 and the stationary contact rod 13 and the connection 132 of the second support connection part 15 and the stationary contact rod 13 is in poor contact, specifically R Bmax The corresponding joint is in poor contact and step 590 is performed. If the third loop resistance R B1 And a fourth loop resistor R B2 Maximum value of R Bmax With a minimum value R Bmin Difference R of Bmax -R Bmin And a third loop resistor R B1 And a fourth loop resistor R B2 Minimum value of R Bmin Ratio (R) of Bmax -R Bmin )/R Bmin If the value is less than the second threshold, it indicates that the connection 131 of the first support connecting part 14 and the stationary contact rod 13 and the connection 132 of the second support connecting part 15 and the stationary contact rod 13 are in good contact, and step 570 is performed.
And 570, determining that the loop resistance of the static contact is qualified.
Step 580, determining that the larger of the first loop resistance and the second loop resistance is not acceptable.
And step 600, determining that the loop resistance of the static contact is unqualified.
The embodiment of the invention provides another loop resistance testing method for a fixed contact of an isolating switch. Fig. 9 is a flowchart of a method for testing a loop resistance of a fixed contact of an isolating switch according to another embodiment of the present invention. On the basis of the above embodiment, the test method includes:
and step 610, acquiring the integral loop resistance between the bus clamp and the static contact rod.
And step 620, judging whether the overall loop resistance is in a third threshold range.
If the overall loop resistance is within the third threshold range, step 630 is executed. If the overall loop resistance is not within the third threshold range, step 700 is performed.
Step 630, obtaining a second group of resistance values, wherein the second group of resistance values includes: a third loop resistance between the first support connection component and the stationary contact rod, and a fourth loop resistance between the second support connection component and the stationary contact rod.
And step 640, judging whether the ratio of the difference value between the maximum value and the minimum value in the third loop resistance and the fourth loop resistance to the minimum value in the third loop resistance and the fourth loop resistance is greater than or equal to a second threshold value.
Wherein, if the third loop resistance R B1 And a fourth loop resistor R B2 Maximum value of R Bmax And minimum value R Bmin Difference R of Bmax -R Bmin And a third loop resistor R B1 And a fourth loop resistor R B2 Minimum value of R Bmin Ratio (R) of Bmax -R Bmin )/R Bmin Greater than or equal to the second threshold, step 690 is performed. If the third loop resistance R B1 And a fourth loop resistor R B2 Maximum value R in Bmax With a minimum value R Bmin Difference R of Bmax -R Bmin And a third loop resistor R B1 And a fourth loop resistor R B2 Minimum value of R Bmin Ratio (R) of Bmax -R Bmin )/R Bmin Less than the second threshold, step 650 is performed.
Step 650, obtaining a first set of resistance values, wherein the first set of resistance values includes: the first loop resistance between the first support connecting part and the bearing part and the second loop resistance between the second support connecting part and the bearing part.
Step 660, judging whether the ratio of the difference value between the maximum value and the minimum value in the first loop resistance and the second loop resistance to the minimum value in the first loop resistance and the second loop resistance is larger than or equal to a first threshold value.
Wherein, if the first loop circuit resistor R A1 And a second loop resistor R A2 Maximum value of R Amax With a minimum value R Amin Difference R of Amax -R Amin And a first loop resistor R A1 And a second loop resistor R A2 Minimum value of R Amin Ratio (R) of Amax -R Amin )/R Amin If it is greater than or equal to the first threshold, step 680 is performed. If the first loop resistance R A1 And a second loop resistor R A2 Maximum value R in Amax And minimum value R Amin Difference R of Amax -R Amin And a first loop resistor R A1 And a second loop resistor R A2 Minimum value of R Amin Ratio of (R) Amax -R Amin )/R Amin Less than the first threshold, then step 670 is performed.
Step 670, determining that the loop resistance of the static contact is qualified.
And step 680, determining that the larger loop resistance in the first loop resistance and the second loop resistance is unqualified.
The embodiment of the invention provides a loop resistance testing device for a fixed contact of an isolating switch. Fig. 10 is a schematic structural diagram of a circuit resistance testing device for a fixed contact of an isolating switch according to an embodiment of the present invention. The loop resistance testing device for the fixed contact of the isolating switch can be used for executing the loop resistance testing method for the fixed contact of the isolating switch provided by any embodiment of the invention. Wherein, static contact 1 includes: bus-bar clamp 11, carrier 12, still touch pole 13, first support connecting part 14 and second support connecting part 15, bus-bar clamp 11 is fixed on carrier 12, carrier 12 sets up with still touch pole 13 interval, the first end of carrier 12 is connected with the first end of first support connecting part 14, the second end of first support connecting part 14 is connected with the first end of still touch pole 13, the second end of carrier 12 is connected with the first end of second support connecting part 15, the second end of second support connecting part 15 is connected with the second end of still touch pole 13. The test device comprises: a first acquisition module 710 and a determination module 720.
The first obtaining module 710 is configured to obtain at least one of a first group resistance value and a second group resistance value, where the first group resistance value includes: first circuit resistance R between first support connection member 14 and carrier member 12 A1 And a second loop resistance R between the second support and connection member 15 and the carrier member 12 A2 And a second set of resistances comprising: third loop resistance R between first support connection part 14 and stationary contact bar 13 B1 And a fourth loop resistance R between the second support and connection member 15 and the stationary contact bar 13 B2 (ii) a The determining module 720 is configured to determine whether the loop resistance of the static contact is qualified according to at least one of the first group resistance value and the second group resistance value.
Optionally, the first obtaining module 710 is configured to obtain a first group of resistance values; the determining module 720 is used for determining the first loop resistance R A1 And a second loop resistor R A2 Maximum value of R Amax With a minimum value R Amin And the first loop resistance R A1 And a second loop resistor R A2 Minimum value of R Amin Ratio (R) of Amax -R Amin )/R Amin If the resistance is larger than or equal to the first threshold value, the first loop resistance R is determined A1 And a second loop resistor R A2 The larger loop resistance in (a) fails.
Optionally, the first obtaining module 710 is configured to obtain a second group of resistance values; the determination module 720 is used for determining the third loop resistance R B1 And a fourth loop resistor R B2 Maximum value of R Bmax With a minimum value R Bmin Difference R of Bmax -R Bmin And a third loop resistor R B1 And a fourth loop resistor R B2 Minimum value of R Bmin Ratio (R) of Bmax -R Bmin )/R Bmin If the resistance is greater than or equal to the second threshold value, the third loop resistance R is determined B1 And a fourth loop resistor R B2 The larger loop resistance of (1) fails.
Optionally, on the basis of the foregoing embodiment, fig. 11 is a schematic structural diagram of a circuit resistance testing device for a fixed contact of an isolating switch according to another embodiment of the present invention, where the circuit resistance testing device for a fixed contact of an isolating switch further includes: the second obtaining module 730, configured to obtain an overall loop resistance between the bus bar and the stationary contact bar before the determining module 720 determines whether the loop resistance of the stationary contact is qualified according to at least one of the first group of resistance values and the second group of resistance values; correspondingly, the determining module 710 is configured to determine whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values if the overall loop resistance is within the third threshold range.
Optionally, on the basis of the foregoing embodiment, the first obtaining module is configured to obtain a first group resistance value and a second group resistance value; the determining module 720 is used for determining the first loop resistance R A1 And a second loop resistor R A2 Maximum value R in Amax With a minimum value R Amin Difference R of Amax -R Amin And a first loop resistor R A1 And a second loop resistor R A2 Minimum value of R Amin Ratio of (R) Amax -R Amin )/R Amin Less than the first threshold, and a third loop resistance R B1 And a fourth loop resistor R B2 Maximum value of R Bmax And minimum value R Bmin Difference R of Bmax -R Bmin And a third loop resistor R B1 And a fourth loop resistor R B2 Minimum value of R Bmin Ratio of (R) Bmax -R Bmin )/R Bmin And if the current is smaller than the second threshold value, determining that the loop resistance of the static contact is qualified.
Optionally, on the basis of the foregoing embodiment, the determining module 720 is further configured to determine that the loop resistance of the static contact is not qualified if the overall loop resistance is not within the third threshold range.
The circuit resistance testing device for the fixed contact of the disconnecting switch provided in the embodiment of the present invention can execute the circuit resistance testing method for the fixed contact of the disconnecting switch provided in any embodiment of the present invention, and therefore the circuit resistance testing device for the fixed contact of the disconnecting switch provided in the embodiment of the present invention also has the beneficial effects described in the above embodiments, and details are not described here.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (8)
1. A loop resistance test method of a static contact of an isolating switch is characterized in that the static contact comprises the following steps: the bus clamp is fixed on the bearing part, the bearing part and the static contact rod are arranged at an interval, the first end of the bearing part is connected with the first end of the first support connecting part, the second end of the first support connecting part is connected with the first end of the static contact rod, the second end of the bearing part is connected with the first end of the second support connecting part, the second end of the second support connecting part is connected with the second end of the static contact rod, and the test method comprises the following steps:
obtaining at least one of a first set of resistance values and a second set of resistance values, wherein the first set of resistance values comprises: a first loop resistor between the first support connection component and the bearing component, and a second loop resistor between the second support connection component and the bearing component, the second set of resistance values including: a third loop resistor between the first support connecting part and the static contact rod, and a fourth loop resistor between the second support connecting part and the static contact rod;
determining whether the loop resistance of the static contact is qualified or not according to at least one of the first group of resistance values and the second group of resistance values;
before determining whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values, the method further comprises the following steps:
acquiring integral loop resistance between the bus clamp and the static contact rod;
correspondingly, if the integral loop resistor is within a third threshold range, determining whether the loop resistor of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values;
obtaining at least one of the first and second sets of resistance values includes: obtaining a first group of resistance values;
determining whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values comprises:
and if the ratio of the difference value between the maximum value and the minimum value of the first loop resistance and the second loop resistance to the minimum value of the first loop resistance and the second loop resistance is greater than or equal to a first threshold value, determining that the larger loop resistance of the first loop resistance and the second loop resistance is unqualified, wherein the value range of the first threshold value is 80-120%.
2. The method for testing the loop resistance of the static contact of the isolating switch according to claim 1, wherein the obtaining of at least one of the first group of resistance values and the second group of resistance values comprises: obtaining a second group of resistance values;
determining whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values comprises:
and if the ratio of the difference value between the maximum value and the minimum value of the third loop resistance and the fourth loop resistance to the minimum value of the third loop resistance and the fourth loop resistance is greater than or equal to a second threshold value, determining that the larger loop resistance of the third loop resistance and the fourth loop resistance is unqualified.
3. The method for testing the loop resistance of the static contact of the isolating switch according to claim 1, further comprising: and if the integral loop resistance is not within the range of the third threshold value, determining that the loop resistance of the static contact is unqualified.
4. The method of claim 1, wherein obtaining at least one of the first group of resistances and the second group of resistances comprises: acquiring a first group of resistance values and a second group of resistance values;
determining whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values comprises:
and if the ratio of the difference value between the maximum value and the minimum value in the first loop resistance and the second loop resistance to the minimum value in the first loop resistance and the second loop resistance is smaller than a first threshold value, and the ratio of the difference value between the maximum value and the minimum value in the third loop resistance and the fourth loop resistance to the minimum value in the third loop resistance and the fourth loop resistance is smaller than a second threshold value, determining that the loop resistance of the static contact is qualified.
5. The method for testing the loop resistance of the static contact of the isolating switch according to claim 1, wherein the first end of the bearing member is detachably connected to the first end of the first supporting and connecting member, the second end of the first supporting and connecting member is detachably connected to the first end of the static contact rod, the second end of the bearing member is detachably connected to the first end of the second supporting and connecting member, and the second end of the second supporting and connecting member is detachably connected to the second end of the static contact rod.
6. A loop resistance testing device of a static contact of an isolating switch is characterized in that the static contact comprises: busbar clamp, carrier, quiet feeler lever, first support adapting unit and second support adapting unit, the busbar clamp is fixed on the carrier, the carrier with quiet feeler lever interval sets up, the first end of carrier with the first end of first support adapting unit is connected, the second end of first support adapting unit with the first end of quiet feeler lever is connected, the second end of carrier with the first end of second support adapting unit is connected, the second support adapting unit the second end with the second end of quiet feeler lever is connected, testing arrangement includes:
the device comprises a first obtaining module, a second obtaining module and a control module, wherein the first obtaining module is used for obtaining at least one of a first group of resistance values and a second group of resistance values, and the first group of resistance values comprise: a first loop resistor between the first support connecting part and the bearing part, and a second loop resistor between the second support connecting part and the bearing part, wherein the second group of resistance values includes: a third loop resistor between the first support connecting part and the static contact rod, and a fourth loop resistor between the second support connecting part and the static contact rod;
the determining module is used for determining whether the loop resistance of the static contact is qualified or not according to at least one of the first group of resistance values and the second group of resistance values;
the second obtaining module is used for obtaining the whole loop resistance between the bus clamp and the static contact rod before the determining module determines whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values;
correspondingly, the determining module is configured to determine whether the loop resistance of the static contact is qualified according to at least one of the first group of resistance values and the second group of resistance values if the overall loop resistance is within a third threshold range;
the first obtaining module is used for obtaining a first group of resistance values;
the determining module is configured to determine that a larger loop resistance of the first loop resistance and the second loop resistance is unqualified if a ratio of a difference between a maximum value and a minimum value of the first loop resistance and the second loop resistance to a minimum value of the first loop resistance and the second loop resistance is greater than or equal to a first threshold, where a value range of the first threshold is 80% -120%.
7. The device for testing the loop resistance of the static contact of the isolating switch according to claim 6,
the first obtaining module is used for obtaining a second group of resistance values;
the determining module is configured to determine that a larger loop resistance of the third loop resistance and the fourth loop resistance is not qualified if a ratio of a difference between a maximum value and a minimum value of the third loop resistance and the fourth loop resistance to a minimum value of the third loop resistance and the fourth loop resistance is greater than or equal to a second threshold.
8. The device for testing the loop resistance of the static contact of the isolating switch according to claim 6, further comprising:
the first obtaining module is used for obtaining a first group of resistance values and a second group of resistance values;
the determining module is configured to determine that the loop resistance of the static contact is qualified if a ratio of a difference between a maximum value and a minimum value of the first loop resistance and the second loop resistance to a minimum value of the first loop resistance and the second loop resistance is smaller than a first threshold, and a ratio of a maximum value and a minimum value of a difference between the third loop resistance and the fourth loop resistance to a minimum value of the third loop resistance and the fourth loop resistance is smaller than a second threshold;
the determining module is further configured to determine that the loop resistance of the static contact is not qualified if the overall loop resistance is not within the third threshold range.
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