CN102931626A - Circuit capable of protecting fuse-type disconnecting switch in rural distribution network - Google Patents
Circuit capable of protecting fuse-type disconnecting switch in rural distribution network Download PDFInfo
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- CN102931626A CN102931626A CN2011102341242A CN201110234124A CN102931626A CN 102931626 A CN102931626 A CN 102931626A CN 2011102341242 A CN2011102341242 A CN 2011102341242A CN 201110234124 A CN201110234124 A CN 201110234124A CN 102931626 A CN102931626 A CN 102931626A
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- disconnecting switch
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- thermal overload
- protective device
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Abstract
The invention discloses a circuit capable of protecting a fuse-type disconnecting switch in a rural distribution network. An A-phase power supply, a B-phase power supply and a C-phase power supply are electrically connected with the wire inlet end of a thermal overload relay by a main open-circuit alternating-current contactor and a zero-sequence transformer coil of a leakage protector, the wire outlet end of the thermal overload relay is electrically connected with the wire inlet end of the fuse-type disconnecting switch, and the wire outlet end of the fuse-type disconnecting switch is electrically connected with electric equipment; and an neutral wire N is electrically connected with a terminal I of the leakage protector, the C-phase power supply is electrically connected with terminals II and IV of the leakage protector, and a terminal V of the leakage protector is electrically connected with the B-phase power supply by a normally-closed contact of the thermal overload relay and an alternating-current contactor coil. The circuit has the advantages of achieving a correct operation rate of 100%, effectively protecting the fuse-type disconnecting switch, guaranteeing the safety operation of a distribution circuit, and guaranteeing that electrical equipment can work normally and is free from damages and heating.
Description
Technical field
The present invention relates to the power supply technique field, more particularly relate to the technical field of rural area supplying power allocation circuit.
Background technology
General fuse disconnecting switch is with fuse-link or with the fusing carrier of the fuse-link a kind of isolating switch as moving contact; its effect is the load overload that prevents in the circuit; in case load surpasses the capacity of its regulation in the circuit; melt disconnected body and namely fuse and reach the purpose of protection equipment, and can play the effect of isolating switch.The HR6 series fuse disconnecting switch that adopt in the at present rural area distribution more; this isolating switch is the most frequently used a kind of overload protection device in the present rural area distribution low-tension distribution box; in the day-to-day operation process; it is very general that the overload phenomenon occurs in circuit; the probability that melt burns out is very high; about 10 yuan calculating of melt with a RT16-00100A of market price; two loops in the one station power distribution case; want altogether 6 melts, namely 60 yuan, a platform district needed only circuit overload 1 time in one month; just need to change 60 yuan melt; entreprise cost is too high, and easily makes user load device damage on the circuit, thereby has affected power supply reliability and quality of voltage.
Summary of the invention
Purpose of the present invention provides a kind of circuit structure simple in order to solve above-mentioned deficiency exactly; fuse disconnecting switch in the existing power supply unit can be effectively protected, fuse disconnecting switch circuit in the protection rural area distribution of power supply reliability and quality of voltage can be improved.
The technical solution that the present invention adopts in order to solve the problems of the technologies described above is as follows:
A kind of circuit of protecting fuse disconnecting switch in the distribution of rural area, it mainly includes fuse disconnecting switch, earth leakage protective device, A.C. contactor and thermal overload relay, A, B, the C three phase mains confessed from the transformer low voltage pile crown are electrically connected with the end of incoming cables of thermal overload relay through the zero-sequence transformer coil of main open circuit A.C. contactor and earth leakage protective device, the leading-out terminal of thermal overload relay is electrically connected with the end of incoming cables of fuse disconnecting switch, and the leading-out terminal of fuse disconnecting switch is electrically connected with power consumption equipment; The secondary circuit of this circuit is controlled to be: the neutral line N that confesses from the transformer low voltage pile crown is electrically connected with No. 1 terminals of earth leakage protective device; the C phase power supply of confessing from the transformer low voltage pile crown is electrically connected with 2, No. 4 terminals of earth leakage protective device, No. 5 terminals of earth leakage protective device through thermal overload relay normally-closed contact and A.C. contactor line bag and the B that confesses from the transformer low voltage pile crown mutually power supply be electrically connected.
Described fuse disconnecting switch is HR6 series fuse disconnecting switch; Described earth leakage protective device is DBL-5 type earth leakage protective device; Described A.C. contactor is CJ20 type A.C. contactor, and described thermal overload relay is the JR36 Series Thermal Overload Relays.
Described A, B, the C three phase mains of confessing from the transformer low voltage pile crown is electrically connected with end of incoming cables 1/L1,3/L2, the 5/L3 of thermal overload relay through the zero-sequence transformer coil of main open circuit A.C. contactor and earth leakage protective device, and leading-out terminal 2/T1, the 4/T2 of thermal overload relay and 6/T3 are electrically connected with the fuse disconnecting switch end of incoming cables.
The beneficial effect that the present invention adopts above-mentioned technical solution to reach is:
1, the thermal overload relay in the circuit can be when circuit generation overload situations, thermal relay can catch rapidly overload current signal, and in time cut off the job contract of A.C. contactor line and make voltage, cause the A.C. contactor tripping operation, performance factor 100%, effectively protect fuse disconnecting switch, and guaranteed the distribution line safe operation;
2, when electric leakage occurs circuit, thermal overload relay does not disturb earth leakage protective device to catch electric leakage signal, and A.C. contactor can accurately trip during line electrical leakage, performance factor 100%;
3, electric equipment operation is normal, without damaging and fever phenomenon.
Description of drawings
Fig. 1 is line construction schematic diagram of the present invention.
Embodiment
By a kind of circuit of protecting fuse disconnecting switch in the distribution of rural area shown in Figure 1, it mainly includes HR6 series fuse disconnecting switch 1, DBL-5 type earth leakage protective device 2, CJ20 type A.C. contactor 3 and JR36 Series Thermal Overload Relays 4, the A that confesses from the transformer low voltage pile crown, B, the C three phase mains is through main open circuit the zero-sequence transformer coil of A.C. contactor 3 and earth leakage protective device 2 and the end of incoming cables 1/L1 of thermal overload relay 4,3/L2,5/L3 is electrically connected, the leading-out terminal 2/T1 of thermal overload relay 4,4/T2 and 6/T3 are electrically connected with the end of incoming cables of fuse disconnecting switch 1, and the leading-out terminal of fuse disconnecting switch 1 is electrically connected for the user with power consumption equipment; The secondary circuit of this circuit is controlled to be: the neutral line N that confesses from the transformer low voltage pile crown is electrically connected with No. 1 terminals of earth leakage protective device 2; the C phase power supply of confessing from the transformer low voltage pile crown is electrically connected with 2, No. 4 terminals of earth leakage protective device 2, No. 5 terminals of earth leakage protective device 2 through thermal overload relay 4 normally-closed contacts and A.C. contactor 3 line bags and the B that confesses from the transformer low voltage pile crown mutually power supply be electrically connected.
During normal operation, the JR36 Series Thermal Overload Relays is not moved, its auxiliary contact are in normally off, the C phase power supply of confessing from the transformer low voltage pile crown passes through DBL-5 type earth leakage protective device, through JR36 Series Thermal Overload Relays normally-closed contact, then converges at CJ20 type A.C. contactor line bag with the B phase power supply of confessing from the transformer low voltage pile crown, to the operating voltage of line bag with 380V, the A.C. contactor adhesive, circuit is in path, normal outwards power supply;
When electric leakage occurs or gets an electric shock in circuit, the contact of DBL-5 type earth leakage protective device 4., 5. disconnect, CJ20 type A.C. contactor line bag can not get the operating voltage of 380V, the adhesive of CJ20 type A.C. contactor is not in tripped condition;
When overload occurs in circuit, owing to being in normally off at "on" position JR36 Series Thermal Overload Relays auxiliary contact, circuit becomes path, in when, on the circuit overload current occuring when, the inner shell fragment of JR36 Series Thermal Overload Relays begins distortion, and when overload current acquired a certain degree, the thermal overload relay normally-closed contact disconnected, the secondary circuit that further causes the job contract of CJ20 type A.C. contactor line to be done becomes off state, thereby CJ20 type A.C. contactor is in tripped condition.
Need to prove the JR36 Series Thermal Overload Relays after installation, the screw that resets be screwed out, allow it be in the hand-reset state.Because behind the overload trip, we will make clear the circuit overload reason, see because the line short overcurrent causes, or circuit overload cause, after investigating thoroughly that reason is got rid of hidden danger, carry out hand-reset again, restore electricity.
Claims (3)
1. the circuit that can protect fuse disconnecting switch in the distribution of rural area, it is characterized in that: it mainly includes fuse disconnecting switch, earth leakage protective device, A.C. contactor and thermal overload relay, A, B, the C three phase mains confessed from the transformer low voltage pile crown are electrically connected with the end of incoming cables of thermal overload relay through the zero-sequence transformer coil of main open circuit A.C. contactor and earth leakage protective device, the leading-out terminal of thermal overload relay is electrically connected with the end of incoming cables of fuse disconnecting switch, and the leading-out terminal of fuse disconnecting switch is electrically connected with power consumption equipment; The secondary circuit of this circuit is controlled to be: the neutral line N that confesses from the transformer low voltage pile crown is electrically connected with No. 1 terminals of earth leakage protective device; the C phase power supply of confessing from the transformer low voltage pile crown is electrically connected with 2, No. 4 terminals of earth leakage protective device, No. 5 terminals of earth leakage protective device through thermal overload relay normally-closed contact and A.C. contactor line bag and the B that confesses from the transformer low voltage pile crown mutually power supply be electrically connected.
2. a kind of circuit of protecting fuse disconnecting switch in the distribution of rural area according to claim 1 is characterized in that: described fuse disconnecting switch is HR6 series fuse disconnecting switch; Described earth leakage protective device is DBL-5 type earth leakage protective device; Described A.C. contactor is CJ20 type A.C. contactor, and described thermal overload relay is the JR36 Series Thermal Overload Relays.
3. a kind of circuit of protecting fuse disconnecting switch in the distribution of rural area according to claim 1 and 2; it is characterized in that: described A, B, the C three phase mains of confessing from the transformer low voltage pile crown is electrically connected with end of incoming cables 1/L1,3/L2, the 5/L3 of thermal overload relay through the zero-sequence transformer coil of main open circuit A.C. contactor and earth leakage protective device, and leading-out terminal 2/T1, the 4/T2 of thermal overload relay and 6/T3 are electrically connected with the fuse disconnecting switch end of incoming cables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102341242A CN102931626A (en) | 2011-08-12 | 2011-08-12 | Circuit capable of protecting fuse-type disconnecting switch in rural distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102341242A CN102931626A (en) | 2011-08-12 | 2011-08-12 | Circuit capable of protecting fuse-type disconnecting switch in rural distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102931626A true CN102931626A (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102341242A Pending CN102931626A (en) | 2011-08-12 | 2011-08-12 | Circuit capable of protecting fuse-type disconnecting switch in rural distribution network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110311348A (en) * | 2019-08-08 | 2019-10-08 | 广东电网有限责任公司 | Multifunctional protection device and ammeter box |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214207U (en) * | 1987-10-07 | 1988-08-10 | 昆明市五华钢窗总厂 | Domestic acoustooptic alarm distribution box with automatic power-limiting protective apparatus |
| US20070215576A1 (en) * | 2004-10-21 | 2007-09-20 | South China Engineering & Manufactured Ltd. | Electric shock prevention residual current circuit breaker |
| CN201332258Y (en) * | 2008-12-30 | 2009-10-21 | 胶南市供电公司 | Open-phase protection type residual current operated protector |
| CN101702604A (en) * | 2009-12-07 | 2010-05-05 | 河南省电力公司许昌供电公司 | Multi-functional electric motor protecting and starting device |
-
2011
- 2011-08-12 CN CN2011102341242A patent/CN102931626A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214207U (en) * | 1987-10-07 | 1988-08-10 | 昆明市五华钢窗总厂 | Domestic acoustooptic alarm distribution box with automatic power-limiting protective apparatus |
| US20070215576A1 (en) * | 2004-10-21 | 2007-09-20 | South China Engineering & Manufactured Ltd. | Electric shock prevention residual current circuit breaker |
| CN201332258Y (en) * | 2008-12-30 | 2009-10-21 | 胶南市供电公司 | Open-phase protection type residual current operated protector |
| CN101702604A (en) * | 2009-12-07 | 2010-05-05 | 河南省电力公司许昌供电公司 | Multi-functional electric motor protecting and starting device |
Non-Patent Citations (1)
| Title |
|---|
| 陈维新: "农网低压综合配电箱设计及电器元件的配置", 《 湖北电力》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110311348A (en) * | 2019-08-08 | 2019-10-08 | 广东电网有限责任公司 | Multifunctional protection device and ammeter box |
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Application publication date: 20130213 |