CN104157485B - Acousto-optic indicator for switching degree of outdoor alternate current high voltage separation switch - Google Patents

Abstract

The invention discloses an acousto-optic indicator for the closing degree of an outdoor AC high-voltage isolating switch. The top of the shell (2) is provided with a left pile head (3) and a right pile head (4), and the left pile head ( 3) It is connected to the contact (6) at the bottom of the switch knife of the high-voltage isolation switch (5), and the right pile head (4) is connected to the static contact (7) of the switch knife. The unit (8) and the DC test unit (9), the left pile head (3) and the right pile head (4) are connected to the input end of the DC test unit (9), and the output end of the DC test unit (9) is connected to the discrimination The unit (8) is connected, and the discrimination unit (8) is respectively connected with the sound alarm (10), the green alarm light (11) and the red alarm light (12).

Description

An acousto-optic indicator for the closing degree of an outdoor AC high-voltage isolating switch

technical field

The invention relates to an acousto-optic indicator for the closing degree of an outdoor AC high-voltage isolating switch.

Background technique

The 24kV outdoor AC high-voltage disconnector (commonly known as "knife" in medium-voltage lines) is a very important switching device in medium-voltage distribution lines. Its main functions are: to ensure the safety of medium-voltage power distribution equipment and devices during maintenance work, and to function as an isolation voltage. It cannot be used to cut off, input load current and break short-circuit current. Some switching operations, that is to say, it does not have arc extinguishing function. The use of the switch knife ensures the formation of an obvious fracture and the isolation of the live part during the maintenance of the power distribution equipment. Since the isolating switch has no arc extinguishing device and the breaking capacity is low, when operating the isolating switch, the switching operation sequence must be followed, that is, when the power is transmitted , first turn on the isolating switch on the busbar side, then turn on the isolating switch on the line side, and finally turn on the circuit breaker, and the power failure is the opposite of the above. The general structure of the 24kV outdoor AC isolating switch, its electrical connection part is as follows: a copper plate bent into a right angle constitutes a static contact, and one end with a hole can be connected to the bus bar through a screw; the other end is shorter, and it is connected to the The moving blade (moving contact) is in contact. Two copper plates form a contact strip, also known as a moving contact, which can rotate at a certain angle around the axis, and it clamps the static contact when closing. There are as many as dozens of faults caused by the outdoor AC isolating switch (hereinafter referred to as "knife"), and most of these faults are caused by the fact that the switch knife in operation is not closed in place (the contact between the moving contact and the static contact If the degree is not enough, it will directly lead to high contact resistance), which directly affects the safe and reliable operation of the distribution line. When the switch-knife fails to close, that is, when the moving and static contacts are not in close contact, the medium-voltage circuit breaker is closed, and the switch-knife runs with electricity. At this time, the contact area between the moving contact and the static contact is not enough, and the knife edge is not tightly closed, which causes surface oxidation and increases the contact resistance. Under the action of the load current flowing through the switch knife, according to the formula Q=I ² ×R, At this time, the temperature of the contact part of the dynamic and static contacts will be very high. If the switch knife is not closed in place after long-term operation at such a high temperature, it will become a hidden danger in the line operation, which will often lead to more serious consequences. Therefore, how to ensure that the switch knife can be fully closed during operation has become a problem worthy of study.

Contents of the invention

The invention provides an acousto-optic indicator for the closing degree of an outdoor AC high-voltage isolating switch, which increases the contact area of the moving and static contacts of the switch blades and reduces the contact resistance, effectively curbs the safety hazards of the switch blades, reduces The power outage of the medium-voltage line caused by the fault of the knife switch can improve the safe operation level of the power grid and the social and economic benefits.

The present invention adopts the following technical solutions: an acousto-optic indicator for the closing degree of an outdoor AC high-voltage isolating switch, which is provided with a DC resistance monitoring device, and the DC resistance monitoring device is provided with a housing, and the top of the housing is provided with a There are left pile head and right pile head, the left pile head is connected with the contact at the bottom of the switch knife of the high voltage isolating switch, the right pile head is connected with the static contact of the switch knife, and a discrimination unit and DC The test unit, the left pile head and the right pile head are connected to the input end of the DC test unit, the output end of the DC test unit is connected to the discrimination unit, and the discrimination unit is respectively connected to the sound alarm, the green alarm light and the red alarm light, and the DC The test unit is used to measure the DC resistance R _{0 from the contact at the bottom of the knife to the static contact of the knife, and return the value of the DC resistance R 0 to} the judging unit, which judges the knife of the isolating switch according to the set standard value. Whether the switch is closed in place, when the measured DC resistance R ₀ is greater than the set standard value, it means that the switch is not closed in place, the judging unit will send a signal of unsuccessful closing to the sound alarm, and the red alarm light is on at the same time, Indicates that the closing is unsuccessful. If the DC resistance R ₀ is less than or equal to the standard value, it means that the knife switch is in place. The judgment unit sends a successful closing signal to the sound alarm. At the same time, the green alarm light is on, indicating that the closing is successful.

The left pile head is connected to the contact at the bottom of the high-voltage isolating switch through a left connection line, which is an internal wiring. The right side pile head and the static contact of the switch knife are connected by a right connection line, and the right connection line is an internal wiring.

The DC resistance monitoring device is closely attached to the base of the high voltage isolating switch. The DC resistance monitoring device is set as a passive DC resistance monitoring device.

The present invention has the following beneficial effects: after adopting the above technical scheme, a DC resistance monitoring device is provided, and the DC resistance monitoring device is provided with a casing, and a left pile head and a right pile head are arranged on the top of the casing , the left pile head is connected to the contact at the bottom of the switch knife of the high-voltage isolating switch, the right pile head is connected to the static contact of the switch knife, and a discrimination unit and a DC test unit are arranged in the shell, and the left pile head is connected to the right side The pile head is connected to the input terminal of the DC test unit, the output terminal of the DC test unit is connected to the discrimination unit, and the discrimination unit is respectively connected to the sound alarm, the green alarm light and the red alarm light, and the DC test unit is used to measure the contact at the bottom of the knife to the DC resistance R ₀ of the fixed contact of the knife, and return the value of the DC resistance R ₀ to the judging unit. The judging unit judges whether the knife switch of the isolating switch is closed in place according to the set standard value. When the measured DC resistance When R ₀ is greater than the set standard value, it means that the knife switch has not been closed in place, and the judging unit will send a signal of unsuccessful closing to the sound alarm for alarm, and at the same time the red alarm light is on, indicating that the closing is unsuccessful. If the DC resistance R ₀ If it is less than or equal to the standard value, it means that the switch is in place, and the judging unit sends a successful closing signal to the sound alarm. At the same time, the green alarm light is on, indicating that the switch is successful. In this way, through the installation of the DC resistance monitoring device, it is possible to check whether the switch is correct or not. Make an intuitive judgment when the switch is in place, if the switch knife is in place, if the contact resistance is less than the set value, the indicator will emit a sound signal 2, and the green light will be on at the same time, indicating that the moving and static contacts are in place, so that the contact area of the moving and static contacts of the switch knife The contact resistance is increased and the contact resistance is reduced, which effectively curbs the potential safety hazards of the switch knife and reduces the power outage of the medium-voltage line caused by the knife switch failure, thereby improving the safe operation level of the power grid and social and economic benefits. In the present invention, the left pile head is connected to the contact at the bottom of the high-voltage isolating switch through the left connection line, and the left connection line is an internal wiring, and the right pile head and the static contact of the switch knife are connected through the right connection line. The right connecting wire is internally routed, which can avoid the occurrence of short circuit.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

detailed description

In Fig. 1, the present invention provides an acousto-optic indicator for the closing degree of an outdoor AC high-voltage isolating switch, which is provided with a DC resistance monitoring device 1, and the DC resistance monitoring device 1 is provided with a housing 2, in which The top of the body 2 is provided with a left pile head 3 and a right pile head 4, and the left pile head 3 is connected with the contact 6 at the bottom of the switch blade of the high voltage isolating switch 5, and the left pile head 3 is connected with the high voltage isolating switch The contacts 6 at the bottom of 5 are connected by the left connection line 14, the left connection line 14 is the internal wiring, the right pile head 4 is connected with the static contact 7 of the gate knife, and the right pile head 4 is connected with the gate The static contacts 7 of the knife are connected by the right connection line 13, the right connection line 13 is an internal wiring, and a discrimination unit 8 and a DC test unit 9 are arranged in the housing 1, and the left pile head 3 and the right pile head 4 is connected with the input terminal of the DC test unit 9, the output terminal of the DC test unit 9 is connected with the discrimination unit 8, and the discrimination unit 8 is respectively connected with the sound alarm 10, the green alarm lamp 11 and the red alarm lamp 12, and the DC test unit 9 is used Measure the DC resistance R _{0 from the contact 6 at the bottom of the switch knife to the static contact 7 of the switch knife, and return the value of the DC resistance R 0 to} the judging unit 8, and the judging unit 8 judges the isolating switch 5 according to the set standard value Whether the switch is in place, when the measured DC resistance R ₀ is greater than the set standard value, it means that the switch is not in place, the judging unit 8 will send a signal of unsuccessful closing to the sound alarm 10 to alarm, and at the same time The red alarm light 12 is on, indicating that the closing is unsuccessful. If the DC resistance R0 is less than or equal to the standard value, it means that the knife switch is in place, and the judgment unit ₈ sends a successful closing signal to the sound alarm 10, and the green alarm light 11 is on at the same time. , indicating successful closing, the DC resistance monitoring device 1 is closely attached to the base of the high voltage isolating switch 5, and the DC resistance monitoring 1 device is set as a passive DC resistance monitoring device.

Claims (1)

1. a kind of Acoustooptic indicator of outdoor AC high-voltage disconnecting switch combined floodgate degree, is characterized in that it is provided with D.C. resistance monitoring device（1）, described D.C. resistance monitoring device（1）It is provided with housing（2）, in housing（2）Top be provided with left side pile crown（3）With right side pile crown（4）, left side pile crown（3）With high voltage isolator（5）Plug-in strip bottom contact（6）Connect, right side pile crown（4）Static contact with plug-in strip（7）Connect, in housing（1）Inside it is provided with judgement unit（8）With DC test unit（9）, left side pile crown（3）With right side pile crown（4）With DC test unit（9）Input connect, DC test unit（9）Outfan and judgement unit（8）Connect, judgement unit（8）Respectively with voice guard（10）, green alarm lamp（11）With red alarm lamp（12）Connect, DC test unit（9）For measuring the contact of plug-in strip bottom（6）To plug-in strip static contact（7）D.C. resistance R0, and the value of D.C. resistance R0 is returned to judgement unit（8）, judging unit（8）Switched come detection and isolation according to the standard value setting（5）Disconnecting link whether in-place closing, when the D.C. resistance R0 of measurement is more than the standard value setting, then the non-in-place closing of disconnecting link, judging unit are described（8）The unsuccessful signal that closes a floodgate will be sent to voice guard（10）Report to the police, red alarm lamp simultaneously（12）Bright, represent that combined floodgate is unsuccessful, if D.C. resistance R0 is less than or equal to standard value, disconnecting link in-place closing, judgement unit are described（8）Send closing success signal to voice guard（10）, green alarm lamp simultaneously（11）Bright, represent closing success, described left side pile crown（3）With high voltage isolator（5）Bottom contact（6）Between pass through left connecting line（14）Connect, left connecting line（14）For internal wiring, described right side pile crown（4）Static contact with plug-in strip（7）Between pass through right connecting line（13）Connect, right connecting line（13）For internal wiring, described D.C. resistance monitoring device（1）It is close to high voltage isolator（5）Base on, described D.C. resistance monitoring（1）Device is set to passive D.C. resistance monitoring device.