CN2170594Y

CN2170594Y - Distributing box for residential building

Info

Publication number: CN2170594Y
Application number: CN 93242799
Authority: CN
Inventors: 赵冰
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-10-19
Filing date: 1993-10-19
Publication date: 1994-06-29
Anticipated expiration: 2003-10-19

Abstract

The utility model relates to a distributing box for a residential building. The distributing box is provided with a watt-hour meter, a safety box and a detecting and protecting circuit. The detecting and protecting circuit comprises a power-off starting time delay circuit, an under-voltage, an overvoltage, a short circuit, an overload, an electric shock and a leakage sampling circuits, comparators respectively distinguishing the sampled signals, a driver, a relay executing circuit and an executing switch which respond for signals outputted by each comparator, a failure classifying display and a failure alarm. The distributing box has the advantages of normalized integral installation and comprehensive protection functions, can also display the classification of the failure and alarm for the failure.

Description

Distributing box for residential building

The utility model is a kind of for the distribution box of residential building resident family adapted.

In prior art, the distribution facility of residential building resident family generally comprises safety box and kilowatt-hour meter, because facility is fairly simple, all adopts distribution panelboard to install.Along with the raising of people to the household electricity safety requirements, power protector has also become one of distribution facility of family's indispensability.Yet at present power protector is scattered installation mostly, its structure size, and cabling, installation site etc. are all lack of standardization, and existing power protector also is of a great variety, and are multifarious, the standard that neither one is unified.This situation of family expenses distribution facility is not suitable for the installation of new residential building distribution facility very much.

The purpose of this utility model provides a kind of normalized and have a residential building distribution box of multiple electricity protection.

Solution of the present utility model is as follows: referring to Fig. 1, it has a casing, is provided with kilowatt-hour meter (1), safety box (2) and detects protective circuit in casing.Described kilowatt-hour meter and safety box are connected in the electricity consumption major loop, and described detection protective circuit comprises that outage starts delay circuit (15) and is connected on under-voltage on the electricity consumption major loop; overvoltage; short circuit; overload; get an electric shock; electric leakage sample circuit (3); (4); (5); the comparator that above-mentioned sampled signal is differentiated (6) respectively; (7); (8); (9); (10); the driver (11) that the signal that each comparator is exported responds; (12); relay is carried out loop (13); carry out switch (14) and failure modes display; fault alarm (16).

By above-mentioned solution as can be seen, this distribution box all fits together the distribution facility of family expenses, makes them have the advantage of standardization integral installation.This distribution box also has the full advantage of defencive function, and it has the defencive function of overvoltage, under-voltage, short circuit, overload, electric shock, electric leakage, startup time-delay, and can carry out the classification demonstration and the fault alarm of fault.

Describe its structure and operation principle in detail according to embodiment below.

Fig. 1, the distribution box circuit block diagram.

Fig. 2, the circuit theory diagrams of sample circuit, power circuit, kilowatt-hour meter, safety box.

Fig. 3, the circuit theory diagrams of comparator, driver, display.

Fig. 4, the circuit theory diagrams of execution loop, alarm.

Referring to Fig. 2, on the electricity consumption major loop, insert safety box (2), carry out switch (14) and kilowatt-hour meter (1).Safety box plays the effect of secondary short-circuit protection, carries out switch and is used for cutting off and connecting the electricity consumption major loop.Elementary winding and secondary winding (21), bridge rectifier (22), filter capacitor, voltage stabilizing integrated device (23) and power supply indicator (24) by transformer (20) constitute power circuit, and it provides operating voltage VD for the control circuit of back.Elementary winding and secondary winding (25), bridge rectifier (26), voltage divider (27) and voltage divider (28) and the under-voltage and overvoltage sample circuit of filter capacitor formation by transformer (20).When voltage ripple of power network, the under-voltage sampled signal V1 that voltage divider (27) output changes thereupon, the overvoltage sampled signal V2 that voltage divider (28) output changes thereupon.Connect and compose short circuit and overload sample circuit by current transformer (29), bridge rectifier (30), filter capacitor (31), (32), potentiometer (33), (34) and resistance (35).When power network current changes, by potentiometer (33) output short-circuit sampled signal V3, by potentiometer (34) output overloading sampled signal V4.Be connected into electric leakage, electric shock sample circuit by current transformer (36), bridge rectifier (37), filter capacitor (38) and resistance (39).Generally, the current polarity that flows through in two elementary windings of instrument transformer (36) is opposite, cancel out each other in the magnetic field that is produced, so non-inductive electric current in the secondary winding, when the electric current in the electricity consumption major loop directly leaks electricity by human body or electrical appliance, electric current disequilibrium in two elementary windings produces induced current in secondary winding, and by resistance (39) output induced electromotive force V5.

Referring to Fig. 3, among Fig. 2 the sampled signal of each sample circuit output send into respectively the input of corresponding comparator.Described outage starts delay circuit and is connected and composed by timer (40), driver (41) and relay J 1.Referring to Fig. 4, normally opened contact J1-1, relay J 2, normally-closed contact J2-1, the J3-1 of J3 and the solenoid and the DC power supply VD of self-locking key switch (43) and relay J 4 by relay J 1 connect and compose the first execution loop, connect and compose the second execution loop by the normally opened contact of relay J 4 and the solenoid K and the DC power supply VD of execution switch.Normally opened contact J2-2, J3-2 and squealer (42) by relay J 2 and J3 connect and compose described alarm with DC power supply VD.The operation principle of foregoing circuit is as follows: during the electrical network incoming call, timer (40) is started working, the contact of relay J 1, J2, J3 is in the state shown in Fig. 4, through behind the timing, timer (40) output high level, then light-emitting diode (44) is bright, the indication electrical network begins normal power supply, driver (41) conducting simultaneously, relay J 1 action, the then first execution loop connection, relay J 4 is moved and is connected second and carry out the loop, and makes execution switch (14) closure and connection electricity consumption major loop.When line voltage is in under-voltage condition; the magnitude of voltage of under-voltage sampled signal V1 is less than the set reference voltage value V6 of comparator (6), and then comparator (6) is exported high level, and light-emitting diode (45) is bright; the indication line voltage is a under-voltage condition; simultaneously, driver (11) conducting, relay J 2 actions; J2-1 cuts off first and carries out the loop; make relay J 4 discharge its contact and disconnect the second execution loop, carry out switch motion and cut off the electricity consumption major loop, finish under-voltage defencive function.When line voltage is in overvoltage or electricity consumption major loop and is in short circuit, electric shock, electric leakage situation; sampled signal V2, V3, V5 are all greater than comparator (7), (8), (10) set reference voltage value V7, V8, V10; then comparator (7), (8), (10) are all exported high level separately; light-emitting diode (46), (47), (48) are made corresponding faulty indication respectively; simultaneously; relay J 2 actions; make and carry out switch cut-out electricity consumption major loop, thereby finish the defencive function of overvoltage, short circuit, electric leakage, electric shock.When overload situations appears in the electricity consumption major loop; the magnitude of voltage of overload sampled signal V4 is higher than the set reference voltage value V9 of comparator (9); then comparator (9) is exported high level; make timer (50) work; when overload situations is not also eliminated if arrive timing; then timer is exported high level; light-emitting diode (49) is bright; indication electricity consumption loop is in overload; simultaneously, driver (12) conducting, relay J 3 actions; make and carry out switch cut-out electricity consumption major loop, thereby finish the defencive function of overload.In relay J 2, J3 action, alarm is also connected by contact J2-2 or J3-2, is in the situation of improper power supply or electricity consumption with auditory tone cues mains supply or electricity consumption major loop.Carry out the classification demonstration of fault in the foregoing description with indicator light (44)～(49), also the classification shows signal can be taken out and carry out the numeral demonstration, use the digitized representation failure mode.Squealer (42) can adopt existing direct current buzzer or piezoelectric ceramic class squealer or phonetic alarm.Existing 555 timing circuits are adopted in timer (40), (50).

Claims

1; a kind of residential building distribution box; it is characterized in that: have a casing; in casing, be provided with kilowatt-hour meter (1); safety box (2) and detection protective circuit; described kilowatt-hour meter and safety box are connected in the electricity consumption major loop, and described detection protective circuit comprises that outage starts delay circuit (15) and is connected on under-voltage on the electricity consumption major loop; overvoltage; short circuit; overload; get an electric shock; electric leakage sample circuit (3); (4); (5); the comparator that above-mentioned sampled signal is differentiated (6) respectively; (7); (8); (9); (10); the driver (11) that the signal that each comparator is exported responds; (12); relay is carried out loop (13); carry out switch (14) and failure modes display; fault alarm (16).