CN209946255U - High tension switchgear electrification indicating device with line grounding protection - Google Patents
High tension switchgear electrification indicating device with line grounding protection Download PDFInfo
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- CN209946255U CN209946255U CN201920675201.XU CN201920675201U CN209946255U CN 209946255 U CN209946255 U CN 209946255U CN 201920675201 U CN201920675201 U CN 201920675201U CN 209946255 U CN209946255 U CN 209946255U
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Abstract
A high-voltage switch cabinet electrification indicating device with line grounding protection comprises a main control unit, an electrification indicating unit and a grounding detection unit, wherein the electrification indicating unit comprises a voltage comparator, an electrification indicating light-emitting diode and an optical coupler; the ground detection unit comprises a ground indicator lamp, a pulse transmitting circuit and a pulse receiving circuit, the signal output end of the main control unit is connected with a ground indication light emitting diode, the pulse transmitting circuit is connected with the signal input end of the main control unit, and the signal output end of the main control unit is connected with a signal of the high-voltage electrified sensor. The utility model discloses can easily judge whether constructor articulates the ground wire protection according to the standard requirement when electrical construction, whether demolish the earth connection after the construction to reduce construction potential safety hazard, simple structure, it is convenient suitable for.
Description
Technical Field
The utility model belongs to the technical field of the high tension switchgear, especially, relate to an electrified indicating device of high tension switchgear with circuit ground protection.
Background
The high-voltage switch cabinet mainly plays roles of on-off, control or protection and the like in power generation, power transmission, power distribution, electric energy conversion and consumption of a power system, and is mainly used for electric products with the voltage level of 3.6kV ~ 550 kV.
The high-voltage switch cabinet has higher voltage, and enough protection and electrification prompting measures are needed during operation.
At present, a charged indicator of a high-voltage switch cabinet only can play the functions of charged indication and charged locking; and under the condition of no electricity, the indicator lamp is turned off and the unlocking action is carried out simultaneously.
According to the requirements of electrical five-prevention and the safety operation specification of electrical construction, a grounding wire must be hung on a power failure line, and the grounding wire is dismantled and power supply is recovered after construction is finished.
If constructors are completely conscious of thinness, the operation is not completely carried out according to operation rules, carelessness is great, and switching-on and power transmission operations can be carried out without dismounting grounding wires, so that a fault of short-circuit tripping is caused, and the normal operation of a power grid is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an excellent in use effect, high-tension switchgear with circuit ground protection live indicating device of security.
In order to solve the technical problem, the utility model provides a following technical scheme: the utility model provides an electrified indicating device of high tension switchgear with line ground protection is provided with high-voltage electricity sensor, its characterized in that in the high-voltage board: the high-voltage electrified sensor comprises a main control unit, an electrified indicating unit and a grounding detection unit, wherein the signal output end of the high-voltage electrified sensor is connected with the electrified indicating unit and the grounding detection unit through a first switch and a second switch respectively; the charged indication unit comprises a voltage comparator, a charged indication light-emitting diode and an optical coupler, wherein the in-phase input end of the voltage comparator is connected with the signal output end of the high-voltage charged sensor, the reverse-phase input end of the voltage comparator is grounded, the output end of the voltage comparator is connected with the signal input end of the main control unit through the optical coupler, and the output end of the optical coupler is connected with the charged indication light-emitting diode; the ground detection unit comprises a ground indicator lamp, a signal output end of the main control unit is connected with a ground indication light emitting diode, and an IO port of the main control unit is connected with a signal output end of the high-voltage electrified sensor.
The first switch and the second switch are respectively a normally open contact and a normally closed contact of the control relay, a signal output end of the main control unit is connected with a first triode, a base electrode of the first triode is connected with a signal output end of the main control unit, a collector electrode of the first triode is connected with a power supply through a coil of the control relay, and an emitting electrode of the first triode is grounded.
The charged indicating unit comprises an A-phase charged indicating unit, a B-phase charged indicating unit and a C-phase charged indicating unit, and the A-phase charged indicating unit, the B-phase charged indicating unit and the C-phase charged indicating unit are the same in composition.
The A-phase electrified indicating unit comprises a first resistor, a voltage stabilizing diode, a first diode and a second diode, the signal output end of the high-voltage electrified sensor is connected with the anode of the first diode through the first resistor, the cathode of the first diode is connected with the in-phase input end of a voltage comparator, the first resistor is further connected with the cathode of the voltage stabilizing diode, the anode of the voltage stabilizing diode is grounded, the signal output end of the voltage comparator is connected with the anode of the second diode, and the cathode of the second diode is connected with the input end of an optocoupler.
The signal output end of the voltage comparator is connected with a third resistor, the signal output end of the voltage comparator is connected with the anode of the charged indicating light-emitting diode through the third resistor, and the cathode of the charged indicating light-emitting diode is grounded.
The non-inverting input end of the voltage comparator is also connected with a first polarity capacitor, a first capacitor and a second resistor in parallel, and the second polarity capacitor, the first capacitor and the second resistor are all grounded.
The inverting input end of the optical coupler is grounded through a pull-down resistor.
The in-phase output end of the optical coupler is connected with a first light emitting diode and a fourth resistor, the in-phase output end of the optical coupler is connected with the cathode of the first light emitting diode, and the anode of the first light emitting diode is connected with a power supply through the fourth resistor; the in-phase output end of the optical coupler is connected with the signal input end of the main control unit, and the reverse-phase output end of the optical coupler is grounded.
The in-phase output end of the optocoupler is connected with a first triode and a closing/unlocking relay, the closing/unlocking relay comprises a closing/unlocking relay coil and a closing/unlocking relay normally-open contact, the in-phase output end of the optocoupler is connected with a base of the first triode, and the relay of the first triode is connected with a power supply through the closing/unlocking relay coil.
And the voltage regulating circuit comprises a fifth resistor, a sixth resistor and a sliding rheostat, the power supply is connected with the first end of the sliding rheostat, the second end of the sliding rheostat is connected with the fifth resistor, the second end of the fifth resistor is connected with the inverted input end of a voltage comparator of the phase-A, phase-B and phase-C live indicating units, and the second end of the fifth resistor is grounded through the sixth resistor.
Through the technical scheme, the beneficial effects of the utility model are that: the utility model discloses can be when electrical construction, according to the bright state of going out of pilot lamp, judge whether constructor articulates ground wire protection according to the standard requirement, whether demolish the earth connection after the construction is finished to reduce construction potential safety hazard, simple structure, it is convenient suitable for.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a graph of reflected waves when the ground wire is not removed;
fig. 3 is a reflected wave pattern after the ground wire is removed.
Detailed Description
The high-voltage switch cabinet electrification indicating device with the line grounding protection function is characterized in that a high-voltage electrification sensor is arranged in a high-voltage switch cabinet, and in the embodiment, the high-voltage electrification sensor is a high-voltage electrification sensor which is manufactured by Fujianson power equipment Limited and has the model number of PRW-12/50.
As shown in fig. 1, the high-voltage switch cabinet electrification indicating device comprises a main control unit, an electrification indicating unit and a grounding detection unit.
The main control unit selects a singlechip U1 with the model of STC15F2K32S2, and needs a minimum system of the singlechip U1 to ensure the normal operation of the singlechip U1, wherein the minimum system of the singlechip U1 comprises a clock circuit and a reset circuit.
The signal output end of the high-voltage electrified sensor is connected with the electrified indicating unit and the grounding detection unit through the first switch and the second switch respectively.
Wherein, first switch and second switch are the normally open contact and the normally closed contact of control relay J2 respectively to guarantee that first switch and second switch can not be closed simultaneously.
The signal output end (port P3.5/INT 3) of singlechip U1 is connected with second triode Q2, the signal output end of singlechip U1 is connected to the base of second triode Q2, the power is connected through the coil of control relay J2 to the collecting electrode of second triode Q2, the projecting pole ground of second triode Q2, thereby, singlechip U1 output signal reaches second triode Q2, control the second triode Q2 break-on or cut-off, and then control first switch conduction or second switch conduction, the switching-on of the electrified indicating unit or the switching-on of ground connection detecting element of final realization.
The charging indicating unit comprises an A-phase charging indicating unit, a B-phase charging indicating unit and a C-phase charging indicating unit, and the A-phase charging indicating unit, the B-phase charging indicating unit and the C-phase charging indicating unit are the same in composition.
In this embodiment, an a-phase charged indication unit is taken as an example, and the a-phase charged indication unit includes a first resistor R1, a third resistor R10, a zener diode D1, a first diode D2, a second diode D3, a voltage comparator U1A, a charged indication light emitting diode D12, and an optical coupler E1.
In order to adjust the comparison voltage of the voltage comparator U1A, the charging indication unit further includes a voltage regulation circuit, the voltage regulation circuit includes a fifth resistor R4, a sixth resistor R3 and a sliding resistor RW1, the power supply is connected to the first end of the sliding resistor RW1, the second end of the sliding resistor RW1 is connected to the fifth resistor R4, the second end of the fifth resistor R4 is connected to the inverting input terminal of the voltage comparator U1A of the a-phase charging indication unit, the B-phase charging indication unit and the C-phase charging indication unit, and the second end of the fifth resistor R4 is further grounded through the sixth resistor R3.
The signal output end of the high-voltage electrified sensor is connected with a first resistor R1 through a normally closed contact of a control relay J2, a first resistor R1 is connected with the anode of a first diode D2, the cathode of the first diode D2 is connected with the non-inverting input end of a voltage comparator U1A, a first resistor R1 is further connected with the cathode of a voltage stabilizing diode D1, and the anode of the voltage stabilizing diode D1 is grounded. In order to ensure the signal temperature, the non-inverting input terminal of the voltage comparator U1A is further connected in parallel with a first polarity capacitor C1, a first capacitor C2 and a second resistor R2, and the second polarity capacitor, the first capacitor C2 and the second resistor R2 are all grounded.
The inverting input of voltage comparator U1A is connected to ground.
The signal output end of the voltage comparator U1A is connected with the anode of the live indication light emitting diode D12 through a third resistor R10, and the cathode of the live indication light emitting diode D12 is grounded.
The signal output end of the voltage comparator U1A is further connected with the anode of a second diode D3, the cathode of the second diode D3 is connected with the non-inverting input end of an optocoupler E1, and the inverting input end of the optocoupler E1 is grounded through a pull-down resistor.
The in-phase output end of the optocoupler E1 is connected with a first light-emitting diode D7 and a fourth resistor R14, the in-phase output end of the optocoupler E1 is connected with the cathode of the first light-emitting diode D7, and the anode of the first light-emitting diode D7 is connected with a power supply through the fourth resistor R14; the in-phase output end of the optical coupler E1 is connected with the signal input end (port P3.3/INT 1) of the single chip microcomputer through a port TEXT, and the reverse phase output end of the optical coupler E1 is grounded.
The in-phase output end of the optocoupler E1 is connected with a first triode Q1 and an on/off-lock relay J1, the on/off-lock relay J1 comprises an on/off-lock relay J1 coil and an on/off-lock relay J1 normally-open contact, the in-phase input end of the optocoupler E1 is connected with the base of the first triode Q1, and the relay of the first triode Q1 is connected with a power supply through an on/off-lock relay J1 coil.
The signal output end of the high-voltage electrified sensor is connected with an IO pin (port P3.2/INT 0) of the single chip microcomputer U1 through a normally open contact of the control relay J2.
The singlechip U1 generates a pulse signal by using a timer of the singlechip U1 and sends the pulse signal to the high-voltage charged sensor through an IO pin (port P3.2/INT 0) of the singlechip U1, the high-voltage charged sensor reflects the pulse signal to the IO pin (port P3.2/INT 0) of the singlechip U1 by using the time-sharing multiplexing principle of the singlechip, the singlechip U1 compares the transmitted pulse signal with the reflected pulse signal, and the comparison here only shows whether the polarity of the received pulse signal is the same as that of the transmitted pulse signal.
The signal output end (port P3.4/INT 2) of the singlechip U1 is connected with the cathode of the grounding indication light-emitting diode D6, and the anode of the grounding indication light-emitting diode D6 is grounded through a seventh resistor R5.
When the high-voltage electrified sensor works, the capacitor current at the output end of the high-voltage electrified sensor flows into the ground through the first resistor R1 and the voltage-stabilizing diode D1, is rectified through the first diode D2, filtered through the first polarity capacitor C1 and the first capacitor C2 and then is sent to the voltage comparator U1A, if the amplitude is larger than the window voltage, the voltage comparator U1A outputs a high level, and the output of the voltage comparator U1A lights the corresponding electrified indicating light-emitting diode D12.
The outputs of three voltage comparators U1A of the A-phase electrified indicating unit, the B-phase electrified indicating unit and the C-phase electrified indicating unit form an OR gate by respective second diodes D3, the OR gate is isolated by an optocoupler E1 and then transmits the electrified state level to a singlechip U1 for collection, and the electrified state level is transmitted to a first triode Q1 to control an on/off relay J1 to generate locking and unlocking contacts.
After the singlechip U1 receives the charged state level, when judging that the power failure unblock condition is in, control relay J2 actuation, disconnection electrification instruction detecting element, ground connection detecting element is received to high-voltage charged sensor's output, because high-voltage charged sensor's electric capacity is only several PF, consequently, adopts the low pressure pulse emission method.
The single chip microcomputer U1 sends low-voltage pulse to the output end of the high-voltage charged sensor, and then detects reflected waves, if the ground wire is not yet removed from the input end of the high-voltage charged sensor, the polarity of the reflected waves is opposite to that of the original transmitted waves, and the amplitude is large, as shown in figure 2, otherwise, the amplitude of the reflected waves is weak or the polarities are the same, as shown in figure 3.
The single chip microcomputer U1 judges whether the circuit has ground protection according to the polarity and amplitude of the received reflected wave; if the situation that the grounding wire is not detached is detected, the single chip microcomputer U1 outputs a signal to enable the grounding indication light-emitting diode D6 to flicker, and the attention of constructors is prompted.
The utility model discloses can be when electrical construction, according to the bright state of going out of pilot lamp, judge whether constructor articulates ground wire protection according to the standard requirement, whether demolish the earth connection after the construction is finished to reduce construction potential safety hazard, simple structure, it is convenient suitable for.
Claims (10)
1. The utility model provides an electrified indicating device of high tension switchgear with line ground protection is provided with high-voltage electricity sensor, its characterized in that in the high-voltage board: the high-voltage electrified sensor comprises a main control unit, an electrified indicating unit and a grounding detection unit, wherein the signal output end of the high-voltage electrified sensor is connected with the electrified indicating unit and the grounding detection unit through a first switch and a second switch respectively; the charged indication unit comprises a voltage comparator, a charged indication light-emitting diode and an optical coupler, wherein the in-phase input end of the voltage comparator is connected with the signal output end of the high-voltage charged sensor, the reverse-phase input end of the voltage comparator is grounded, the output end of the voltage comparator is connected with the signal input end of the main control unit through the optical coupler, and the output end of the optical coupler is connected with the charged indication light-emitting diode; the ground detection unit comprises a ground indicator lamp, a signal output end of the main control unit is connected with a ground indication light emitting diode, and an IO port of the main control unit is connected with a signal output end of the high-voltage electrified sensor.
2. The high-voltage switch cabinet live indicating device with line grounding protection as claimed in claim 1, wherein: the first switch and the second switch are respectively a normally open contact and a normally closed contact of the control relay, a signal output end of the main control unit is connected with a first triode, a base electrode of the first triode is connected with a signal output end of the main control unit, a collector electrode of the first triode is connected with a power supply through a coil of the control relay, and an emitting electrode of the first triode is grounded.
3. The high-voltage switch cabinet live indicating device with line grounding protection as claimed in claim 1, wherein: the charged indicating unit comprises an A-phase charged indicating unit, a B-phase charged indicating unit and a C-phase charged indicating unit, and the A-phase charged indicating unit, the B-phase charged indicating unit and the C-phase charged indicating unit are the same in composition.
4. The high-voltage switch cabinet live indicating device with line grounding protection as claimed in claim 3, wherein: the A-phase electrified indicating unit comprises a first resistor, a voltage stabilizing diode, a first diode and a second diode, the signal output end of the high-voltage electrified sensor is connected with the anode of the first diode through the first resistor, the cathode of the first diode is connected with the in-phase input end of a voltage comparator, the first resistor is further connected with the cathode of the voltage stabilizing diode, the anode of the voltage stabilizing diode is grounded, the signal output end of the voltage comparator is connected with the anode of the second diode, and the cathode of the second diode is connected with the input end of an optocoupler.
5. The high-voltage switch cabinet live indicating device with line ground protection of any one of claims 1 to 4, characterized in that: the signal output end of the voltage comparator is connected with a third resistor, the signal output end of the voltage comparator is connected with the anode of the charged indicating light-emitting diode through the third resistor, and the cathode of the charged indicating light-emitting diode is grounded.
6. The high voltage switchgear live indicating device with line ground protection of claim 5, wherein: the non-inverting input end of the voltage comparator is also connected with a first polarity capacitor, a first capacitor and a second resistor in parallel, and the second polarity capacitor, the first capacitor and the second resistor are all grounded.
7. The high voltage switchgear live indicating device with line ground protection of claim 6, wherein: the inverting input end of the optical coupler is grounded through a pull-down resistor.
8. The high-voltage switch cabinet live indicating device with line ground protection of claim 1 or 7, characterized in that: the in-phase output end of the optical coupler is connected with a first light emitting diode and a fourth resistor, the in-phase output end of the optical coupler is connected with the cathode of the first light emitting diode, and the anode of the first light emitting diode is connected with a power supply through the fourth resistor; the in-phase output end of the optical coupler is connected with the signal input end of the main control unit, and the reverse-phase output end of the optical coupler is grounded.
9. The high voltage switchgear live indicating device with line ground protection of claim 8, wherein: the in-phase output end of the optocoupler is connected with a second triode and a closing/unlocking relay, the closing/unlocking relay comprises a closing/unlocking relay coil and a closing/unlocking relay normally-open contact, the in-phase output end of the optocoupler is connected with a base of the second triode, and the relay of the second triode is connected with a power supply through the closing/unlocking relay coil.
10. The high voltage switchgear with line grounding protection as claimed in claim 9, wherein: and the voltage regulating circuit comprises a fifth resistor, a sixth resistor and a sliding rheostat, the power supply is connected with the first end of the sliding rheostat, the second end of the sliding rheostat is connected with the fifth resistor, the second end of the fifth resistor is connected with the inverted input end of a voltage comparator of the phase-A, phase-B and phase-C live indicating units, and the second end of the fifth resistor is grounded through the sixth resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920675201.XU CN209946255U (en) | 2019-05-13 | 2019-05-13 | High tension switchgear electrification indicating device with line grounding protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920675201.XU CN209946255U (en) | 2019-05-13 | 2019-05-13 | High tension switchgear electrification indicating device with line grounding protection |
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| CN209946255U true CN209946255U (en) | 2020-01-14 |
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| CN201920675201.XU Active CN209946255U (en) | 2019-05-13 | 2019-05-13 | High tension switchgear electrification indicating device with line grounding protection |
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