CN207571234U - Leakage alarm - Google Patents
Leakage alarm Download PDFInfo
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- CN207571234U CN207571234U CN201720563341.9U CN201720563341U CN207571234U CN 207571234 U CN207571234 U CN 207571234U CN 201720563341 U CN201720563341 U CN 201720563341U CN 207571234 U CN207571234 U CN 207571234U
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Abstract
The utility model discloses a kind of leakage alarms, belong to power engineering field.The leakage alarm includes：Test rapier, ground connection rapier, measuring circuit and warning circuit；It tests one end of rapier and the metal shell of electrical equipment connects, it tests the other end of rapier and the first input end of measuring circuit connects, second input terminal of measuring circuit and the first input end of warning circuit are connect respectively with external power supply, the output terminal of measuring circuit and the second input terminal of warning circuit connect, and the ground terminal of measuring circuit and the output terminal of warning circuit are connect respectively with ground connection rapier.The external power supply that the utility model passes through access is the first input end of warning circuit and the second supplying power for input end of measuring circuit, so that when test rapier detects the metal shell electric leakage of electrical equipment, measuring circuit is connected, and then guide alarm circuit is alarmed, it avoids and fails the metal shell leaky for finding the electrical equipment in time, and then the electric shock accidents caused.
Description
Technical field
The utility model is related to power engineering field, more particularly to a kind of leakage alarm.
Background technology
Nowadays, it leaks electricity in order to avoid the insulation damages of the live part of electrical equipment disposed in oil gas field, the electricity
Gas equipment, which is usually constructed with, connects zero-sum ground protection line.It is mostly operated in due to the electrical equipment under the adverse circumstances in outdoor field,
Adverse circumstances influence in the case of, the electrical equipment connect zero or ground protection line due to long-term corrosion, Ke Nengcun
The disconnected de- or virtual connection the problems such as.When electrical equipment connect zero or ground protection line there is disconnected de- or virtual connection when, in the electrical equipment
Live part insulation damages in the case of, the metal shell of the electrical equipment is it is possible that leaky, to operator
The safety of member forms very big hidden danger.
In the relevant technologies, the metal shell of electrical equipment substantially uses the zero connection protection of three-phase four-wire system, is set when electrically
It is standby to connect zero or ground protection line when there is disconnected de- or virtual connection, in the situation of the insulation damages of the live part of the electrical equipment
Under, operating personnel can only be measured with voltage test pencil, and then judge whether the metal shell of the electrical equipment leaks electricity.
However, being often coated with one layer of paint on the metal shell of electrical equipment, which is being judged using voltage test pencil
Metal shell when whether leaking electricity, voltage test pencil is difficult accurately to detect, and be easy to cause misjudgment phenomenon.Further more, work as outdoor environment
When severe, operating personnel are easy to cause the metal for failing to find the electrical equipment in time using the reasons such as lack of standardization of voltage test pencil
Body leakage phenomenon, and then the electric shock accidents caused.
Utility model content
In order to avoid failing to find the metal shell leaky of the electrical equipment in time, and then the electric shock accidents caused
Problem, the utility model provide a kind of leakage alarm.The technical solution is as follows：
On the one hand, a kind of leakage alarm is provided, the leakage alarm includes：It tests rapier, ground connection rapier, measure
Circuit and warning circuit；
It is described test rapier one end and electrical equipment metal shell connect, it is described test rapier the other end with it is described
The first input end connection of measuring circuit, the test rapier are used for the leakage current on the metal shell of the electrical equipment
It is transmitted to the measuring circuit；
Second input terminal of the measuring circuit and the first input end of the warning circuit are connect respectively with external power supply,
The output terminal of the measuring circuit is connect with the second input terminal of the warning circuit, and the measuring circuit is used for detecting
When stating the leakage current on the metal shell of electrical equipment, trigger the warning circuit and alarm；
The output terminal of the ground terminal of the measuring circuit and the warning circuit is connect respectively with the ground connection rapier, with logical
The ground connection rapier is crossed to be grounded.
Optionally, the measuring circuit includes the first triode, the first capacitance, first resistor, second resistance and third electricity
Resistance；
One end of the first resistor is connect with the test rapier, the other end of the first resistor and the described second electricity
One end connection of resistance, the other end of the second resistance respectively with one end of first capacitance, one end of the 3rd resistor
It is connected with the base stage of first triode；
The other end of first capacitance and the other end of the 3rd resistor are connect respectively with the ground connection rapier；
The collector of first triode is connect with the external power supply, the emitter of first triode with it is described
The second input terminal connection of warning circuit.
Optionally, first triode is NPN type triode.
Optionally, the warning circuit includes alarm module and the second triode；
One end of the alarm module is connect with the external power supply, the other end of the alarm module and the described 2nd 3
The collector connection of pole pipe, the base stage of second triode are connect with the output terminal of the measuring circuit, the two or three pole
The emitter of pipe is connect with the ground connection rapier.
Optionally, second triode is NPN type triode.
Optionally, the leakage alarm further includes：Transformer, rectification circuit and regulator circuit；
The primary coil of the transformer is connect with the external power supply, one end of the secondary coil of the transformer and institute
The first input end connection of rectification circuit is stated, the second of the other end of the secondary coil of the transformer and the rectification circuit is defeated
Enter end connection；
The output terminal of the rectification circuit is connect with the input terminal of the regulator circuit, the output terminal point of the regulator circuit
The second input terminal not with the first input end of the warning circuit and the measuring circuit is connect, the third of the rectification circuit
The common end of input terminal and the regulator circuit is connect respectively with the ground connection rapier.
Optionally, the rectification circuit includes the first rectifying tube, the second rectifying tube, third rectifying tube and the 4th rectifying tube；
The cathode of the anode of first rectifying tube and second rectifying tube secondary coil with the transformer respectively
One end connection, the cathode of the anode of the third rectifying tube and the 4th rectifying tube secondary wire with the transformer respectively
The other end connection of circle；
The cathode of the cathode of first rectifying tube and the third rectifying tube input terminal with the regulator circuit respectively
The anode of connection, the anode of second rectifying tube and the 4th rectifying tube is connect respectively with the ground connection rapier.
Optionally, the regulator circuit includes three terminal integrated voltage stabilizer, the second capacitance and third capacitance；
One end of the input terminal of the three terminal integrated voltage stabilizer and the third capacitance is defeated with the rectification circuit respectively
Outlet connects, one end of the output terminal of the three terminal integrated voltage stabilizer and second capacitance respectively with the warning circuit the
One input terminal connects, the common end of the three terminal integrated voltage stabilizer, the other end of the third capacitance and second capacitance
The other end is connect respectively with the ground connection rapier.
Optionally, the leakage alarm further includes hookup；
The hookup is connected in parallel between the first input end of the warning circuit and the second input terminal.
Optionally, the hookup includes test button and the 4th resistance；
The test button is connected with the 4th resistance, and do not connect in the test button with the 4th resistance
One end is connect with the second input terminal of the warning circuit, the one end not connect in the 4th resistance with the test button with
The first input end connection of the warning circuit；
Alternatively, the test button is connected with the 4th resistance, and in the test button not with the 4th resistance
One end of connection is connect with the first input end of the warning circuit, is not connect in the 4th resistance with the test button
One end is connect with the second input terminal of the warning circuit.
Optionally, the leakage alarm further includes insulation crust, the measuring circuit, the warning circuit, the change
Depressor, the rectification circuit and the regulator circuit are located at the inside of the insulation crust.
The advantageous effect of technical solution provided by the utility model is：In the utility model, by external power supply to survey
Circuit and warning circuit power supply are measured, it, should if test rapier detects the leakage current on the metal shell of the electrical equipment
Leakage current is transmitted to measuring circuit by testing rapier, after measuring circuit is connected, is exported from measuring circuit to warning circuit,
After guide alarm circuit, the electric current which generates is exported from warning circuit to ground connection rapier, so as to make the external electricity
Source, warning circuit and ground connection rapier forming circuit, so that warning circuit is alarmed, when avoiding operating personnel because using voltage test pencil,
Misjudgment phenomenon caused by when measuring inaccurate also avoids the reasons such as lack of standardization because using voltage test pencil, causes to fail to send out in time
The now metal shell leaky of the electrical equipment, and then the electric shock accidents caused.
Description of the drawings
Fig. 1 is the first leakage alarm that the utility model embodiment provides；
Fig. 2 is second of leakage alarm that the utility model embodiment provides；
Fig. 3 is the third leakage alarm that the utility model embodiment provides；
Fig. 4 is the 4th kind of leakage alarm that the utility model embodiment provides；
Fig. 5 is the 5th kind of leakage alarm that the utility model embodiment provides.
Reference numeral：
1：Test rapier；2：It is grounded rapier；3：Measuring circuit；4：Warning circuit；
1a：Test one end of rapier；1b：Test the other end of rapier；
3a：The first input end of measuring circuit；3b：Second input terminal of measuring circuit；3c：The output terminal of measuring circuit；
3d：The ground terminal of measuring circuit；
4a：The first input end of warning circuit；4b：Second input terminal of warning circuit；4c：The output terminal of warning circuit；
VT1：First triode；C1：First capacitance；R1：First resistor；R2：Second resistance；R3：3rd resistor；
41：Alarm module；VT2：Second triode；
5：Transformer；6：Rectification circuit；7：Regulator circuit；8：Hookup；
51：Primary coil；52：Secondary coil；
5a：One end of secondary coil；5b：The other end of secondary coil；
6a：The first input end of rectification circuit；6b：Second input terminal of rectification circuit；6c：The output terminal of rectification circuit；
6d：The third input terminal of rectification circuit；
7a：The input terminal of regulator circuit；7b：The output terminal of regulator circuit；7c：The common end of regulator circuit；
8a：The input terminal of hookup；8b：The output terminal of hookup；
D1：First rectifying tube；D2：Second rectifying tube；D3：Third rectifying tube；D4：4th rectifying tube；
IC2：Three terminal integrated voltage stabilizer；C2：Second capacitance；C3：Third capacitance；
ST：Test button；R4：4th resistance；
K：Switch；9：Insulation crust；10：Power-line plug.
Specific embodiment
It is new to this practicality below in conjunction with attached drawing to make the purpose of this utility model, technical solution and advantage clearer
Type embodiment is described in further detail.
Fig. 1 is a kind of structure diagram for leakage alarm that the utility model embodiment provides.Referring to Fig. 1, the electric leakage
Alarm includes：Test rapier 1, ground connection rapier 2, measuring circuit 3 and warning circuit 4；
The metal shell of one end 1a and electrical equipment for testing rapier 1 connect, and test the other end 1b of rapier 1 with measuring
The first input end 3a connections of circuit 3, test rapier 1 are used to the leakage current on the metal shell of the electrical equipment being transmitted to
Measuring circuit 3；
Second input terminal 3b of measuring circuit 3 and the first input end 4a of warning circuit 4 are connect respectively with external power supply, are surveyed
The output terminal 3c of amount circuit 3 is connect with the second input terminal 4b of warning circuit 4, and measuring circuit 3 is for detecting that this electrically sets
During leakage current on standby metal shell, triggering warning circuit 4 is alarmed；
The ground terminal 3d of the measuring circuit 3 and output terminal 4c of warning circuit 4 is connect respectively with ground connection rapier 2, with by connecing
Ground rapier 2 is grounded.
Since one end 1a of test rapier 1 and the metal shell of electrical equipment are connected, the other end 1b of rapier 1 is tested with surveying
The first input end 3a connections of circuit 3 are measured, therefore, in the metal shell electric leakage of electrical equipment, test rapier 1 can detect
The leakage current of the metal shell of electrical equipment, and the leakage current is transmitted to measuring circuit 3.Again due to measuring circuit 3
The first input end 4a of second input terminal 3b and warning circuit 4 is connect respectively with external power supply, and the output terminal 3c of measuring circuit 3
Connect with the second input terminal 4b of warning circuit 4, therefore, measuring circuit 3 conducting after, which can be exported to
Warning circuit 4, guide alarm circuit 4, so as to which warning circuit 4 be made to alarm.
In the utility model embodiment, first test rapier 1 is connected on the metal shell of electrical equipment, then will be connect
2 access device ground terminal of ground rapier.When external power supply is powered, supplied by external power supply for measuring circuit 3 and warning circuit 4
Electricity, if test rapier 1 detects leakage current on the metal shell of the electrical equipment, the leakage current is from test rapier
1 is transmitted to measuring circuit 3, after measuring circuit 3 is connected, is exported from measuring circuit 3 to warning circuit 4, guide alarm circuit 4 it
Afterwards, the electric current which generates is exported from warning circuit 4 to ground connection rapier 2, so as to which warning circuit 4 be made to alarm, is avoided
When operating personnel are because using voltage test pencil, misjudgment phenomenon caused by when being not allowed because measuring is also avoided because using not advising for voltage test pencil
The reasons such as model cause to fail to find the metal shell leaky of the electrical equipment in time, and then the electric shock accidents caused.
As shown in Fig. 2, measuring circuit 3 can include the first triode VT1, the first capacitance C1, first resistor R1, the second electricity
Hinder R2 and 3rd resistor R3；
One end of first resistor R1 is connect with test rapier 1, the other end of first resistor R1 and one end of second resistance R2
Connection, the other end of second resistance R2 respectively with one end of the first capacitance C1, one end of 3rd resistor R3 and the first triode
The base stage connection of VT1；The other end of first capacitance C1 and the other end of 3rd resistor R3 are connect respectively with ground connection rapier 2；First
The collector of triode VT1 is connect with external power supply, the emitter of the first triode VT1 and the second input terminal of warning circuit 4
4b connections.
Wherein, since the live part voltage of electrical equipment is higher, however, the voltage needed for warning circuit 4 is relatively low, because
This, when test rapier 1 detects the leakage current of metal shell of electrical equipment, can pass through first resistor R1, the second electricity
It hinders R2 and 3rd resistor R3 and current limliting voltage division processing is carried out to the leakage current, so that the voltage at 3rd resistor R3 both ends is relatively low.When
The voltage-drop loading to the first triode VT1 base stage and meet the first triode VT1 turn-on condition when, the one or three can be connected
Pole pipe VT1, so as to be exported electric current to warning circuit 4 from the first triode VT1.
Since the live part of electrical equipment can be alternating current, the voltage of 3rd resistor R3 both ends loading can be with
It is handled by the coupling of the first capacitance C1, to remove the noise signal in the voltage, avoids leading because of the noise signal
Logical measuring circuit 3, and then there is the phenomenon that false alarm.
However, in practical application, the noise signal that is included due to the leakage current that test rapier 1 detects may be compared with
Small, smaller on the false alarm influence of the leakage alarm, therefore, measuring circuit 3 can not also include the first capacitance C1 and third
Resistance R3 only includes the first triode VT1, first resistor R1 and second resistance R2.
As shown in Fig. 2, warning circuit 4 can include 41 and second triode VT2 of alarm module；One end of alarm module 41
It is connect with external power supply, the other end of alarm module 41 is connect with the collector of the second triode VT2, the second triode VT2's
Base stage is connect with the output terminal 3c of measuring circuit 3, and the emitter of the second triode VT2 is connect with ground connection rapier 2.
Wherein, when the electric current of output that the base stage of the second triode VT2 receives measuring circuit 3, make the second triode
The base stage of VT2 is loaded with voltage, and then the second triode VT2 is connected, and is exported from the second triode VT2 to ground connection rapier 2,
So as to be formed into a loop external power supply, warning circuit 4, ground connection rapier 2, so that alarm module is alarmed.
It should be noted that the first triode VT1 and the second triode VT2 can be NPN type triodes.Alarm module 41
Can be voice alarm module, light warning module or sound and light alarm module etc., the embodiment of the present disclosure is not specifically limited this.
Further, since external power supply can be DC power supply or AC power, when external power supply is direct current
During power supply, which can be described above, when external power supply is AC power, as shown in figure 3, the leakage-current alarm
Device can also include transformer 5, rectification circuit 6 and regulator circuit 7；
The primary coil 51 of transformer 5 is connect with external power supply, one end 5a of the secondary coil 52 of transformer 5 and rectification
The first input end 6a connections of circuit 6, the other end 5b of the secondary coil 52 of transformer 5 and the second input terminal of rectification circuit 6
6b connections；The output terminal 6c of rectification circuit 6 is connect with the input terminal 7a of regulator circuit 7, the output terminal 7b of regulator circuit 7 respectively with
The first input end 4a of warning circuit 4 is connected with the second input terminal 3b of measuring circuit 3, the third input terminal 6d of rectification circuit 6
It is connect respectively with the ground connection rapier 2 with the common end 7c of regulator circuit.
Wherein, transformer 5 is used to carry out the voltage of the external power supply of access decompression processing, and then treated by decompression
The electric current of external power supply is exported to rectification circuit 6.
Rectification circuit 6 is used to carry out rectification processing to the decompression of transformer 5 treated electric current, and alternating current is converted to arteries and veins
Dynamic direct current, and then treated that Rectified alternating current is transmitted to regulator circuit 7 by rectification.Wherein, Rectified alternating current is finger direction
Electric current constant, that size changes over time.
Regulator circuit 7 is used to carry out voltage stabilizing processing to 6 rectification of rectification circuit treated Rectified alternating current, so that pulsation is straight
Galvanic electricity is converted to direct current, and then by voltage stabilizing treated direct current electricity output to warning circuit 4 and measuring circuit 3.
As shown in figure 4, rectification circuit 6 can include the first rectifying tube D1, the second rectifying tube D2, third rectifying tube D3 and the
Four rectifying tube D4；
The cathode of the anode of first rectifying tube D1 and the second rectifying tube D2 one end 5a with the secondary coil of transformer 5 respectively
Connection, the anode of third rectifying tube D3 and the cathode of the 4th rectifying tube D4 respectively with the other end 5b of the secondary coil of transformer 5
Connection；The cathode of first rectifying tube D1 and the cathode of third rectifying tube D3 are connect respectively with the input terminal 7a of regulator circuit 7, and second
The anode of the anode of rectifying tube D2 and the 4th rectifying tube D4 are connect respectively with ground connection rapier 2.
Wherein, the anode of the anode of the first rectifying tube D1 and third rectifying tube D3 the secondary coil packet with transformer 5 respectively
The two output terminals connection included, since periodic SIN function is presented in the electric current of two output terminals of secondary coil, can
With the electric current based on rectifying tube unidirectionally by characteristic, rectification processing is carried out to periodically variable electric current, so that rectification circuit 6
The electric current of output is converted to pulse direct current.
Specifically, when one end 5a of the secondary coil of transformer 5 outputs are positive voltage, other end 5b outputs are negative voltage
When, one end 5a for positive voltage is exported by the first rectifying tube D1 output currents, positive voltage is provided for rectification circuit 6, is exported and is
The other end 5b of negative voltage is connect by the 4th rectifying tube D4 with ground connection rapier 2, does not provide voltage for rectification circuit 6；Similarly,
It is negative voltage when one end 5a of the secondary coil of transformer 5 is exported, when other end 5b outputs is positive voltages, exports as negative voltage
One end 5a is connect by the second rectifying tube D2 with ground connection rapier 2, is not provided voltage for rectification circuit 6, is exported as the another of positive voltage
One end 5b provides positive voltage by third rectifying tube D3 output currents for rectification circuit 6.
As shown in figure 4, regulator circuit 7 can include three terminal integrated voltage stabilizer IC2, the second capacitance C2 and third capacitance C3；
The input terminal of three terminal integrated voltage stabilizer IC2 and one end of third capacitance C3 respectively with the output terminal 6c of rectification circuit 6
Connection, one end of the output terminal of three terminal integrated voltage stabilizer IC2 and the second capacitance C2 respectively with the first input end 4a of warning circuit 4
Connection, the other end of the common end of three terminal integrated voltage stabilizer IC2, the other end of third capacitance C3 and the second capacitance C2 is respectively with connecing
Ground rapier 2 connects.
Wherein, three terminal integrated voltage stabilizer IC2 is used for the Rectified alternating current progress voltage stabilizing processing of the output to rectification circuit 6,
So that the electric current that regulator circuit 7 exports is direct current, third capacitance C3 and the second capacitance C2 provides filtering work for regulator circuit 7
With, wherein, for removing output to the alternating current in regulator circuit 7, the second capacitance C2 is used to remove output extremely third capacitance C3
Alternating current in warning circuit 4.Wherein, the specific method for stabilizing voltage of three terminal integrated voltage stabilizer IC2 refers to the relevant technologies, this practicality is new
Type embodiment no longer elaborates.
It should be noted that the connection mode of three terminal integrated voltage stabilizer IC2, the second capacitance C2 and third capacitance C3 can be with
Be the input terminal of three terminal integrated voltage stabilizer IC2, one end of the second capacitance C2 and third capacitance C3 one end respectively with rectification circuit
6 output terminal 6c connections, the output terminal of three terminal integrated voltage stabilizer IC2 are connect with the first input end 4a of warning circuit 4, three end collection
The other end into the common end of voltage-stablizer IC2, the other end of the second capacitance C2 and third capacitance C3 connects respectively with ground connection rapier 2
It connects；
Alternatively, the second capacitance C2 connects with third capacitance C3, the second capacitance C2 connect with third capacitance C3 after one end
Connect with the input terminal of three terminal integrated voltage stabilizer IC2, the second capacitance C2 connect with third capacitance C3 after the other end and three ends
The common end of integrated regulator IC2 is connect respectively with ground connection rapier 2.
Further, before whether leaking electricity and being detected to the metal shell of electrical equipment, as shown in figure 3, the electric leakage
Alarm can also include hookup 8；
Hookup 8 is connected in parallel between the first input end 4a of warning circuit 4 and the second input terminal 4b, that is to say, experiment
The input terminal 8a of circuit 8 is connect with the first input end 4a of warning circuit 4, output terminal 8b and the warning circuit 4 of hookup 8
The second input terminal 4b connections.Hookup 8 be used for when hookup is powered, test warning circuit 4 whether Normal Alarm.
As shown in figure 4, hookup 8 can include test button ST and the 4th resistance R4；
Test button ST connects with the 4th resistance R4, and in test button ST not with the 4th resistance R4 one end connecting and report
The of second input terminal 4b connections of alert circuit 4, the one end not connect with test button ST in the 4th resistance R4 and warning circuit 4
One input terminal 4a connections；Alternatively, test button ST connects with the 4th resistance R4, and in test button ST not with the 4th resistance R4
One end of connection is connect with the first input end 4a of warning circuit 4, the one end not connect in the 4th resistance R4 with test button ST
It is connect with the second input terminal 4b of warning circuit 4.
Wherein, test button ST be used for conduction test circuit 8, make external power supply generate electric current from hookup export to
Warning circuit 4, so as to guide alarm circuit 4, to warning circuit 4, whether Normal Alarm is tested, and the 4th resistance is used to avoid
Short circuit is formed between the first input end 4a of warning circuit 4 and the second input terminal 4b.
In the utility model embodiment, the leakage alarm can be detected at any time by hookup, with true
The integrity of the fixed leakage alarm, and then avoid the leakage alarm part electric elements damage and false alarm occur or do not report
It the phenomenon that alert, that is to say, when test button ST is closed, hookup 8 is connected, and then guide alarm circuit 4, if alarm mould
Block 41 is alarmed, then the leakage alarm is intact, if alarm module 41 is not alarmed, the leakage alarm part electric appliance member
Part damages.
Whether in addition, after due to access external power supply, may not immediately leak electricity to the metal shell of electrical equipment progress
It measures, is controlled for the ease of the external power supply to access, as shown in figure 4, the leakage alarm can also include switch K,
Switch K is connected to the output terminal of external power supply, that is to say, if currently measured to the metal shell of electrical equipment,
Closure switch K, so that the external power supply of access is respectively that measuring circuit 3 and warning circuit 4 are powered, if current not to electrically setting
Standby metal shell measures, then disconnect switch K so that access external power supply respectively with warning circuit 4 and measuring circuit 3
It disconnects.
In the utility model embodiment, the switch K of the output terminal by being connected to external power supply is realized to the outer of access
Power supply is connect to be controlled, so as to avoid in the case where not measured to the metal shell of electrical equipment, external power supply conducting
Damage of the overlong time to the electric elements inside the leakage alarm.
In addition, due to the naked leakage of the circuit of the leakage alarm outside, in the leakage alarm installation process, in order to reduce
It security risk and is easily installed, which can also include insulation crust 9；
As shown in figure 5, measuring circuit 3, warning circuit 4, transformer 5, rectification circuit 6, regulator circuit 7 and hookup
8 be located at the insulation crust 9 inside, test rapier 1, test rapier 2 and attaching plug 10 be located at insulation crust 9 outside
Portion, loud speaker BL, the test button ST and switch K of alarm module 41 are located at the outer surface of insulation crust 9.
Wherein, power-line plug 10 is powered for connecting external power supply for leakage alarm.
In the utility model embodiment, by by measuring circuit 3, warning circuit 4, transformer 5, rectification circuit 6, voltage stabilizing
The 8 of circuit 7 and hookup are placed in the inside of insulation crust 9, in order in leakage alarm measurement process, to test button
The operation of ST and switch K, and then avoid in the case where the voltage of the external power supply of access is higher, because of the operation of operating personnel
Error or other reasons and the electric shock accidents that causes.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all in this practicality
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (11)
1. a kind of leakage alarm, which is characterized in that the leakage alarm includes：Test rapier, ground connection rapier, measuring circuit
And warning circuit；
One end of the test rapier and the metal shell of electrical equipment connect, the other end of the test rapier and the measurement
The first input end connection of circuit, the test rapier are used to transmit the leakage current on the metal shell of the electrical equipment
To the measuring circuit；
Second input terminal of the measuring circuit and the first input end of the warning circuit are connect respectively with external power supply, described
The output terminal of measuring circuit is connect with the second input terminal of the warning circuit, and the measuring circuit is used to detect the electricity
During leakage current on the metal shell of gas equipment, trigger the warning circuit and alarm；
The output terminal of the ground terminal of the measuring circuit and the warning circuit is connect respectively with the ground connection rapier, to pass through
Ground connection rapier is stated to be grounded.
2. leakage alarm as described in claim 1, which is characterized in that the measuring circuit includes the first triode, first
Capacitance, first resistor, second resistance and 3rd resistor；
One end of the first resistor is connect with the test rapier, the other end of the first resistor and the second resistance
One end connects, the other end of the second resistance respectively with one end of first capacitance, one end of the 3rd resistor and institute
State the base stage connection of the first triode；
The other end of first capacitance and the other end of the 3rd resistor are connect respectively with the ground connection rapier；
The collector of first triode is connect with the external power supply, emitter and the alarm of first triode
The second input terminal connection of circuit.
3. leakage alarm as claimed in claim 2, which is characterized in that first triode is NPN type triode.
4. leakage alarm as described in claim 1, which is characterized in that the warning circuit includes alarm module and the two or three
Pole pipe；
One end of the alarm module is connect with the external power supply, the other end of the alarm module and second triode
Collector connection, the base stage of second triode connect with the output terminal of the measuring circuit, second triode
Emitter is connect with the ground connection rapier.
5. leakage alarm as claimed in claim 4, which is characterized in that second triode is NPN type triode.
6. leakage alarm as described in claim 1, which is characterized in that the leakage alarm further includes：Transformer, rectification
Circuit and regulator circuit；
The primary coil of the transformer is connect with the external power supply, one end of the secondary coil of the transformer with it is described whole
The first input end connection of current circuit, the second input terminal of the other end of the secondary coil of the transformer and the rectification circuit
Connection；
The output terminal of the rectification circuit is connect with the input terminal of the regulator circuit, the output terminal of the regulator circuit respectively with
The first input end of the warning circuit is connected with the second input terminal of the measuring circuit, the third input of the rectification circuit
End and the common end of the regulator circuit are connect respectively with the ground connection rapier.
7. leakage alarm as claimed in claim 6, which is characterized in that the rectification circuit includes the first rectifying tube, second
Rectifying tube, third rectifying tube and the 4th rectifying tube；
The cathode of the anode of first rectifying tube and second rectifying tube respectively with the secondary coil of the transformer one
End connection, the cathode of the anode of the third rectifying tube and the 4th rectifying tube respectively with the secondary coil of the transformer
The other end connects；
Input terminal of the cathode of the cathode of first rectifying tube and the third rectifying tube respectively with the regulator circuit is connect,
The anode of the anode of second rectifying tube and the 4th rectifying tube is connect respectively with the ground connection rapier.
8. leakage alarm as claimed in claim 6, which is characterized in that the regulator circuit include three terminal integrated voltage stabilizer,
Second capacitance and third capacitance；
One end of the input terminal of the three terminal integrated voltage stabilizer and third capacitance output terminal with the rectification circuit respectively
One end of connection, the output terminal of the three terminal integrated voltage stabilizer and second capacitance is defeated with the first of the warning circuit respectively
Enter end connection, the common end of the three terminal integrated voltage stabilizer, the other end of the third capacitance and second capacitance it is another
End is connect respectively with the ground connection rapier.
9. the leakage alarm as described in any in claim 6-8, which is characterized in that the leakage alarm further includes insulation
Shell, the measuring circuit, the warning circuit, the transformer, the rectification circuit and the regulator circuit are located at described
The inside of insulation crust.
10. leakage alarm as described in claim 1, which is characterized in that the leakage alarm further includes hookup；
The hookup is connected in parallel between the first input end of the warning circuit and the second input terminal.
11. leakage alarm as claimed in claim 10, which is characterized in that the hookup includes test button and the 4th
Resistance；
The test button is connected with the 4th resistance, and the one end not connect in the test button with the 4th resistance
Connect with the second input terminal of the warning circuit, in the 4th resistance not with one end that the test button is connect with it is described
The first input end connection of warning circuit；
Alternatively, the test button is connected with the 4th resistance, and it is not connect in the test button with the 4th resistance
One end connect with the first input end of the warning circuit, the one end not connect in the 4th resistance with the test button
It is connect with the second input terminal of the warning circuit.
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| CN201720563341.9U CN207571234U (en) | 2017-05-19 | 2017-05-19 | Leakage alarm |
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| CN201720563341.9U CN207571234U (en) | 2017-05-19 | 2017-05-19 | Leakage alarm |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113282126A (en) * | 2021-07-22 | 2021-08-20 | 南京开关厂有限公司 | Circuit breaker monitoring system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113282126A (en) * | 2021-07-22 | 2021-08-20 | 南京开关厂有限公司 | Circuit breaker monitoring system and method |
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