CN203299326U - Intelligent digital display type universal online safety earthing detection instrument - Google Patents

Abstract

The utility model relates to the field of earthing detection for a low voltage power supply system. Safety earthing of equipment is an important technical measure for guaranteeing safety in utilizing electric power. The utility model aims at providing an intelligent digital display type universal online safety earthing detection instrument which is characterized in that a secondary winding of a transformer is adopted for the safety earthing to apply low voltage, the universal online safety earthing detection instrument and user earth leakage protection form composited dual-leakage protection, so that the safety earthing effect of an earthing wire of a user can be comprehensively detected, the functions of comprehensively detecting the correctness of safety earthing, the earthing current, the earthing resistance and the like are achieved, the safety earthing of power supply, electric power utilization, a commercial residential building, a residential district, an independent resident and the like, as well as the safety earthing of lighting protection equipment and electric equipment can be detected, the safety utilization of electric power is guaranteed, the intelligent digital display type universal online safety earthing detection instrument has the advantages of simple circuit, low cost, easy installation and convenient operation and has a high practical value.

Description

Safety ground intelligent digital formula general-purpose on-line detector

Technical field

The utility model relates to low-voltage power supply system ground connection detection field, particularly safety ground intelligent digital formula general-purpose on-line detector.

Background technology

Low-voltage power supply system is contained and is all used electrical domain, and carrying out safe power supply work is a very important job, and the safety ground of consumer is the important technique measure of guaranteeing safety utilization of electric power.But someone thinks that 380/220 volt of low-voltage power supply voltage is not very high, awareness of safety is Strong not, lack again the bracing wire of safety utilization of electric power general knowledge Sui meaning and connect electricity, wrong ground wire and miss the operations lack of standardization such as ground wire, make consumer have essential safety hidden danger, so the accident of person electric shock occurs, mostly occur in this field.How to find to detect the potential safety hazard of consumer, lack at present simple and effective measure.The simplest 220 volts of single-phase three pole sockets for example, because existing socket is that protection against electric shock jack gap is little and baffle plate is housed, test pencil or universal electric meter indicator are difficult for injecting, even taking socket apart could check, so, even if see that with eyes it is unscientific having ground wire qualified, as separated in ground connection or loose contact or the unearthed line of the other end, ground connection just is equal to nothing.These on-line detectors that all prove a kind of Simple multifunction of present anxious palpus judge the security of consumer and the reliability of earth system, to eliminate safe hidden trouble, stop the generation of accident.

Summary of the invention

The purpose of this utility model is for above-mentioned defect, and a kind of safety requirements, easy and simple to handle that meets is provided, and can detect the safety ground intelligent digital formula general-purpose on-line detector of judgement consumer security performance.

the technical solution of the utility model is safety ground intelligent digital formula general-purpose on-line detector, it is characterized in that utilizing the transformer secondary output winding to apply low-voltage on safety line, safety ground general-purpose on-line detector and user's earth leakage protection form Composite Double earth leakage protection, with this, be used for the safety ground effect of complete detection user ground wire, single-phase tripolar plug CHT1 inserts in the single-phase three pole socket CHZ1 of user, series transformer BT secondary winding BL4 on ground wire after running through zero-sequence transformer BL2, transformer BT armature winding BL3 connection～220V power supply, diverse location by switch ZK1 quantitatively detects the safety ground of consumer or electrical appliance and the ground connection parameter of being correlated with, with this, judge the safety ground effect of detected object comprehensively, the single-phase three pole socket CHZ1 of user and user's earth leakage circuit-breaker RCD1 are detected objects, also that safety ground earth leakage protection is controlled formula general-purpose on-line detector working power, particular circuit configurations is the ground wire PE2 connecting test hole CS1 of single-phase tripolar plug CHT1, the ground wire PE3 of common single-phase three pole socket CHZ2, potentiometer WR1 with run through zero-sequence transformer BL2 after be connected the switch contact a1 of switch ZK1, secondary winding BL4 and relay J 3 coils of switch contact a0 connection transformer BT, the other end of transformer BT secondary winding BL4 connects the other end of relay J 3 coils and ground wire PE4 and the instrument connection CS2 of the single-phase three pole socket CHZ3 of specific function, the live wire L2 of single-phase tripolar plug CHT1 connects power switch K1 through overcurrent fuse RD1, the power switch K1 other end connects checkout button SBNP1, resistance R 1, the normally opened contact of relay J 3, the dropout switch J2 of the live wire L3 of common single-phase three pole socket CHZ2 and earth leakage circuit-breaker RCD2, the other end of dropout switch J2 connects the live wire L4 of the single-phase three pole socket CHZ3 of specific function and the armature winding BL3 of transformer BT after running through zero-sequence transformer BL2, the other end contact resistance R3 of checkout button SBNP1, the other end of resistance R 1 connects the negative pole of diode D1, the negative pole of the anodal connecting luminous diode LED1 of diode D1, the other end contact resistance R2 of relay J 3 normally opened contacts, the other end of resistance R 2 connects the negative pole of diode D2, the negative pole of the anodal connecting luminous diode LED2 of diode D2, the positive pole of the zero line N2 connecting luminous diode LED1 of single-phase tripolar plug CHT1, the positive pole of LED 2, the other end of resistance R 3, the zero line N3 of common single-phase three pole socket CHZ2, run through the other end of connection transformer BT armature winding BL3 after zero-sequence transformer BL2 and zero line N4 and the instrument connection CS3 of the single-phase three pole socket CHZ3 of specific function, switch contact a2 connects the sliding point of the potentiometer WR1 other end and potentiometer WR1, in earth leakage circuit-breaker RCD2, two extension lines of zero-sequence transformer BL2 coil connect two input ends of amplification control circuit Q2, amplification control circuit Q2 output one end connects dropout switch J2 coil, the amplification control circuit Q2 output other end connects the other end of dropout switch J2 coil, diode D1 and diode D2 are for improving the breakdown reverse voltage of LED 1 and LED 2, can be without diode D1 and diode D2 when the current limliting resistance of resistance R 1 and resistance R 2 is enough large, intelligent digital corollary apparatus ZCY is by processor of single chip computer CPU, A/D1 is changed in the modulus change, A/D2 is changed in the modulus change, A/D3 is changed in the modulus change, isolating amplifier circuit Q3, isolating amplifier circuit Q4, isolating amplifier circuit Q5 forms, ground wire between the switch contact a0 of switch ZK1 and transformer BT secondary coil BL4 runs through current transformer BL5, gather the electric current of safety line, current transformer BL5 coil two ends connect respectively two input ends of isolating amplifier circuit Q3, the output terminal of isolating amplifier circuit Q3 connects the modulus change and changes the A/D1 input end, analog-digital conversion a/d 1 output terminal connects demonstration and the processing that processor of single chip computer CPU tests ground current, relay J 3 coil two ends connect respectively two input ends of isolating amplifier circuit Q4, the output terminal of isolating amplifier circuit Q4 connects the modulus change and changes the A/D2 input end, analog-digital conversion a/d 2 output terminals connect processor of single chip computer CPU the operation voltage signal intensity are shown and processes, instrument connection CS2 and instrument connection CS4 connect respectively two input ends of isolating amplifier circuit Q5, the output terminal of isolating amplifier circuit Q5 connects the modulus change and changes the A/D3 input end, analog-digital conversion a/d 3 output terminals connect processor of single chip computer CPU equipotential are carried out to the detection display processing, processor of single chip computer CPU has the output interface of demonstration XS, printout interface DY, communication output TX interface.

Safety ground general-purpose on-line detector described in the utility model has the function of the complete detection such as correct connection to safety ground, ground current, stake resistance, can the stake resistance of the safety grounds such as the safety ground of power supply, electricity consumption, the commercial house, residential quarters, independent resident family etc., lightning-arrest, consumer be detected, guarantee safety utilization of electric power, circuit of the present invention is simple, cost is low, be easy to install, easy to operate advantage, and is very with practical value.

The accompanying drawing explanation

Fig. 1 safety ground intelligent digital formula general-purpose on-line detector circuit theory schematic diagram

single-phase three pole sockets of CHZ1 user in Fig. 1, common single-phase three pole sockets of CHZ2, single-phase three pole sockets of CHZ3 specific function, the CHT1 single-phase tripolar plug, RCD1 user's earth leakage circuit-breaker, the RCD2 earth leakage circuit-breaker, J1-J2 dropout switch, the J3 relay, the Q1-Q2 amplification control circuit, the BL1-BL2 zero-sequence transformer, the BT transformer, the BL3 armature winding, the BL4 secondary winding, L single phase poaer supply live wire, L1-L4 single phase poaer supply live wire, N single phase poaer supply zero line, N1-N4 single phase poaer supply zero line, the PE0-PE4 ground wire, the RD1 fuse, the K1 power switch, the SBNP1 checkout button, the LED1-LED2 light emitting diode, the D1-D2 diode, R1-R3 resistance, the WR1 potentiometer, the ZK1 switch, a0-a2 switch contact, the CS1-CS3 instrument connection, ZCY intelligent digital corollary apparatus, the Q3-Q4 isolating amplifier circuit, the A/D1-A/D2 analog to digital conversion, the CPU processor of single chip computer, XS shows output, the DY printout, TX communication output, the BL5 current transformer, the CS4 instrument connection.

Embodiment

Fig. 1 is that safety ground earth leakage protection is controlled formula general-purpose on-line detector circuit theory schematic diagram, the circuit embodiment is the ground wire PE2 connecting test hole CS1 of single-phase tripolar plug CHT1, the ground wire PE3 of common single-phase three pole socket CHZ2, potentiometer WR1 with run through zero-sequence transformer BL2 after be connected the switch contact a1 of switch ZK1, secondary winding BL4 and relay J 3 coils of switch contact a0 connection transformer BT, the other end of transformer BT secondary winding BL4 connects the other end of relay J 3 coils and ground wire PE4 and the instrument connection CS2 of the single-phase three pole socket CHZ3 of specific function, the live wire L2 of single-phase tripolar plug CHT1 connects power switch K1 through overcurrent fuse RD1, the power switch K1 other end connects checkout button SBNP1, resistance R 1, the normally opened contact of relay J 3, the dropout switch J2 of the live wire L3 of common single-phase three pole socket CHZ2 and earth leakage circuit-breaker RCD2, the other end of dropout switch J2 connects the live wire L4 of the single-phase three pole socket CHZ3 of specific function and the armature winding BL3 of transformer BT after running through zero-sequence transformer BL2, the other end contact resistance R3 of checkout button SBNP1, the other end of resistance R 1 connects the negative pole of diode D1, the negative pole of the anodal connecting luminous diode LED1 of diode D1, the other end contact resistance R2 of relay J 3 normally opened contacts, the other end of resistance R 2 connects the negative pole of diode D2, the negative pole of the anodal connecting luminous diode LED2 of diode D2, the positive pole of the zero line N2 connecting luminous diode LED1 of single-phase tripolar plug CHT1, the positive pole of LED 2, the other end of resistance R 3, the zero line N3 of common single-phase three pole socket CHZ2, run through the other end of connection transformer BT armature winding BL3 after zero-sequence transformer BL2 and zero line N4 and the instrument connection CS3 of the single-phase three pole socket CHZ3 of specific function, switch contact a2 connects the sliding point of the potentiometer WR1 other end and potentiometer WR1, in earth leakage circuit-breaker RCD2, two extension lines of zero-sequence transformer BL2 coil connect two input ends of amplification control circuit Q2, amplification control circuit Q2 output one end connects dropout switch J2 coil, the amplification control circuit Q2 output other end connects the other end of dropout switch J2 coil, diode D1 and diode D2 are for improving the breakdown reverse voltage of LED 1 and LED 2, can be without diode D1 and diode D2 when the current limliting resistance of resistance R 1 and resistance R 2 is enough large, intelligent digital corollary apparatus ZCY is by processor of single chip computer CPU, A/D1 is changed in the modulus change, A/D2 is changed in the modulus change, A/D3 is changed in the modulus change, isolating amplifier circuit Q3, isolating amplifier circuit Q4, isolating amplifier circuit Q5 forms, ground wire between the switch contact a0 of switch ZK1 and transformer BT secondary coil BL4 runs through current transformer BL5, gather the electric current of safety line, current transformer BL5 coil two ends connect respectively two input ends of isolating amplifier circuit Q3, the output terminal of isolating amplifier circuit Q3 connects the modulus change and changes the A/D1 input end, analog-digital conversion a/d 1 output terminal connects demonstration and the processing that processor of single chip computer CPU tests ground current, relay J 3 coil two ends connect respectively two input ends of isolating amplifier circuit Q4, the output terminal of isolating amplifier circuit Q4 connects the modulus change and changes the A/D2 input end, analog-digital conversion a/d 2 output terminals connect processor of single chip computer CPU the operation voltage signal intensity are shown and processes, instrument connection CS2 and instrument connection CS4 connect respectively two input ends of isolating amplifier circuit Q5, the output terminal of isolating amplifier circuit Q5 connects the modulus change and changes the A/D3 input end, analog-digital conversion a/d 3 output terminals connect processor of single chip computer CPU equipotential are carried out to the detection display processing, processor of single chip computer CPU has the output interface of demonstration XS, printout interface DY, communication output TX interface.

Detection method is given an example:

For example the single-phase three pole socket CHZ1 of 1. users and user's earth leakage circuit-breaker RCD1 are detected objects, are also online power supplys, are the huge electrical appliances of quantity, with this, can carry out comprehensive safety detection to it.Its step:

1.. single-phase tripolar plug CHT1 inserts the single-phase three pole socket CHZ1 of user, and switch contact a0 and switch contact a1 connect, and turn on the power switch K switch 1;

2.. LED 1 is bright or do not work, and illustrates whether the single-phase three pole socket CHZ1 of user have electricity;

3.. press checkout button SBNP1, user's earth leakage circuit-breaker RCD1 does not trip proves that the single-phase three pole socket CHZ1 wiring of user are correct, if zero line N1 and the ground wire PE0 misconnection of the single-phase three pole socket CHZ1 of user's earth leakage circuit-breaker RCD1 tripping operation outage proof user, the selection of resistance R 3 resistances must make electric current by resistance R 3 greater than 30mA;

4. with the test pencil checkout can determine single phase poaer supply zero line N and single phase poaer supply live wire L position whether normal;

5.. earth leakage circuit-breaker RCD2 closes, relay J 3 normally opened contacts are connected, LED 2 is bright, illustrate that safety ground earth leakage protection is controlled formula general-purpose on-line detector normal, at this moment with wire, instrument connection CS2 is contacted with electrical appliance ground wire place, if earth leakage circuit-breaker RCD2 tripping operation disconnects, LED 2 goes out, illustrate that the single-phase three pole socket CHZ1 protective earths of user are normal, otherwise proof do not have protective earth or interruption;

6.. with wire, instrument connection CS2 is contacted with instrument connection CS3, earth leakage circuit-breaker RCD2 and user's earth leakage circuit-breaker RCD1 do not trip, with wire, instrument connection CS2 is contacted with electrical appliance ground wire place again, earth leakage circuit-breaker RCD2 and the user's earth leakage circuit-breaker RCD1 disconnection of all tripping, LED 1 and LED 2 go out entirely, single phase poaer supply zero line N1 and ground wire PE1 that single-phase three pole socket CHZ1 are described connect, and ground wire PE1 does not have on the spot ground connection in addition;

7.. switch contact a0 and switch contact a2 connect; the sliding point of potentiometer WR1 is transferred to the minimum resistance position; with wire, instrument connection CS2 is contacted with instrument connection CS3, user's earth leakage circuit-breaker RCD1 does not trip, and illustrates that the user does not install user's earth leakage protection.

For example the ground connection of the 2. pairs of consumer ground connection, anti-lightning strike ground connection (lightning rod) and metal object that should ground connection is detected: switch contact a0 and switch contact a1 connection, with wire, instrument connection CS2 is contacted with tested metal object, the earth leakage circuit-breaker RCD2 disconnection of tripping, illustrate that tested metal object protective earth is normal, otherwise proof do not have protective earth or interruption;

3. single-phase tripolar plug CHT1 insert near the single-phase three pole socket CHZ1 of user of measured object for example, switch contact a0 and switch contact a2 connect, with wire, instrument connection CS1 is connected with instrument connection CS2, data by current transformer BL5 and transformer BT secondary winding BL4 enter intelligent digital corollary apparatus ZCY carries out processes and displays and measures electric current, voltage and stake resistance, with this, determines whether safety ground standard and safety ground meet standard.

4. switch contact a0 and switch contact a2 connect for example; with wire, instrument connection CS2 is connected with instrument connection CS3; when adjustment potentiometer WR1 made the display measurement electric current reach 30mA, user's earth leakage circuit-breaker RCD1 tripping operation disconnected; the numerical value that meets the earth leakage protection regulation, if when the display measurement electric current when user's earth leakage circuit-breaker RCD1 tripping operation disconnects was too many greater than 30mA, proof user earth leakage circuit-breaker RCD1 did not have the safeguard protection effect.

Claims (1)

1. safety ground intelligent digital formula general-purpose on-line detector, it is characterized in that utilizing the transformer secondary output winding to apply low-voltage on safety line, safety ground general-purpose on-line detector and user's earth leakage protection form Composite Double earth leakage protection, with this, be used for the safety ground effect of complete detection user ground wire, single-phase tripolar plug CHT1 inserts in the single-phase three pole socket CHZ1 of user, series transformer BT secondary winding BL4 on ground wire after running through zero-sequence transformer BL2, transformer BT armature winding BL3 connection～220V power supply, diverse location by switch ZK1 quantitatively detects the safety ground of consumer or electrical appliance and the ground connection parameter of being correlated with, with this, judge the safety ground effect of detected object comprehensively, the single-phase three pole socket CHZ1 of user and user's earth leakage circuit-breaker RCD1 are detected objects, also that safety ground earth leakage protection is controlled formula general-purpose on-line detector working power, particular circuit configurations is the ground wire PE2 connecting test hole CS1 of single-phase tripolar plug CHT1, the ground wire PE3 of common single-phase three pole socket CHZ2, potentiometer WR1 with run through zero-sequence transformer BL2 after be connected the switch contact a1 of switch ZK1, secondary winding BL4 and relay J 3 coils of switch contact a0 connection transformer BT, the other end of transformer BT secondary winding BL4 connects the other end of relay J 3 coils and ground wire PE4 and the instrument connection CS2 of the single-phase three pole socket CHZ3 of specific function, the live wire L2 of single-phase tripolar plug CHT1 connects power switch K1 through overcurrent fuse RD1, the power switch K1 other end connects checkout button SBNP1, resistance R 1, the normally opened contact of relay J 3, the dropout switch J2 of the live wire L3 of common single-phase three pole socket CHZ2 and earth leakage circuit-breaker RCD2, the other end of dropout switch J2 connects the live wire L4 of the single-phase three pole socket CHZ3 of specific function and the armature winding BL3 of transformer BT after running through zero-sequence transformer BL2, the other end contact resistance R3 of checkout button SBNP1, the other end of resistance R 1 connects the negative pole of diode D1, the negative pole of the anodal connecting luminous diode LED1 of diode D1, the other end contact resistance R2 of relay J 3 normally opened contacts, the other end of resistance R 2 connects the negative pole of diode D2, the negative pole of the anodal connecting luminous diode LED2 of diode D2, the positive pole of the zero line N2 connecting luminous diode LED1 of single-phase tripolar plug CHT1, the positive pole of LED 2, the other end of resistance R 3, the zero line N3 of common single-phase three pole socket CHZ2, run through the other end of connection transformer BT armature winding BL3 after zero-sequence transformer BL2 and zero line N4 and the instrument connection CS3 of the single-phase three pole socket CHZ3 of specific function, switch contact a2 connects the sliding point of the potentiometer WR1 other end and potentiometer WR1, in earth leakage circuit-breaker RCD2, two extension lines of zero-sequence transformer BL2 coil connect two input ends of amplification control circuit Q2, amplification control circuit Q2 output one end connects dropout switch J2 coil, the amplification control circuit Q2 output other end connects the other end of dropout switch J2 coil, diode D1 and diode D2 are for improving the breakdown reverse voltage of LED 1 and LED 2, can be without diode D1 and diode D2 when the current limliting resistance of resistance R 1 and resistance R 2 is enough large, intelligent digital corollary apparatus ZCY is by processor of single chip computer CPU, A/D1 is changed in the modulus change, A/D2 is changed in the modulus change, A/D3 is changed in the modulus change, isolating amplifier circuit Q3, isolating amplifier circuit Q4, isolating amplifier circuit Q5 forms, ground wire between the switch contact a0 of switch ZK1 and transformer BT secondary coil BL4 runs through current transformer BL5, gather the electric current of safety line, current transformer BL5 coil two ends connect respectively two input ends of isolating amplifier circuit Q3, the output terminal of isolating amplifier circuit Q3 connects the modulus change and changes the A/D1 input end, analog-digital conversion a/d 1 output terminal connects demonstration and the processing that processor of single chip computer CPU tests ground current, relay J 3 coil two ends connect respectively two input ends of isolating amplifier circuit Q4, the output terminal of isolating amplifier circuit Q4 connects the modulus change and changes the A/D2 input end, analog-digital conversion a/d 2 output terminals connect processor of single chip computer CPU the operation voltage signal intensity are shown and processes, instrument connection CS2 and instrument connection CS4 connect respectively two input ends of isolating amplifier circuit Q5, the output terminal of isolating amplifier circuit Q5 connects the modulus change and changes the A/D3 input end, analog-digital conversion a/d 3 output terminals connect processor of single chip computer CPU equipotential are carried out to the detection display processing, processor of single chip computer CPU has the output interface of demonstration XS, printout interface DY, communication output TX interface.

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