CN111525496B - Method for carrying out graded leakage protection on residential area - Google Patents
Method for carrying out graded leakage protection on residential area Download PDFInfo
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- CN111525496B CN111525496B CN202010500396.1A CN202010500396A CN111525496B CN 111525496 B CN111525496 B CN 111525496B CN 202010500396 A CN202010500396 A CN 202010500396A CN 111525496 B CN111525496 B CN 111525496B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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Abstract
The invention relates to leakage protection, in particular to a method for carrying out graded leakage protection on residential areas, which comprises the following steps: setting three levels of residual current protection, including a meter front main switch as the third level protection, a meter rear main switch as the second level protection and a home switch as the first level protection; the residual current protection of each grade is provided with three user coefficients of high, medium and low; and the residual current protection is combined with the user coefficient to form a graded leakage protection system, and the leakage protection of each point switch is configured based on the system and the power utilization attribute. The method ensures that the low-voltage residual current protection can be put into and correctly protect actions in all levels of protection, improves the overall safety level of the low-voltage distribution network, reduces the influence range and ensures the continuity of power supply.
Description
Technical Field
The invention relates to leakage protection, in particular to a method for carrying out graded leakage protection on residential areas.
Background
Urban electricity consumption is mainly classified into four types: the novel system is used for building a cell, an old urban unit building and an urban village. The novel system building cell takes TN-S or TN-C-S as a system grounding type as a main part, the spot-checked type cell is configured with overload protection and overcurrent protection, and a leakage protection device is arranged. The unit buildings in old residential districts and old urban districts are mainly in a TT or TN-C system grounding type, the station areas subjected to spot check are mainly provided with overload protection and overcurrent protection without being provided with leakage protection devices, the villages in the cities are mainly in a TT system grounding type, the station areas subjected to spot check are mainly provided with overload protection and overcurrent protection without being provided with residual current protection. The existing grounding type is disordered, the current running situation of a low-voltage distribution network is unclear, the protection configuration and setting are improper, the great personal electric shock risk exists, the equipment type selection management is extensive, and the low-voltage line is easily blown. In order to improve the safety, patent CN1667906 discloses a time-delay action earth leakage protection switch, which performs earth leakage protection by setting time delay, but this method uses integral tripping, and its influence range is large, the power supply continuity is poor, and an effective earth leakage protection scheme is lacked at present.
Disclosure of Invention
The invention provides a method for carrying out graded leakage protection on residential areas, aiming at optimizing residual current protection configuration of a low-voltage distribution network from a power grid enterprise to a user side in a graded model mode, so that low-voltage residual current protection can be put into protection at each grade and can be correctly protected, the overall safety level of the low-voltage distribution network is improved, the influence range is reduced, and the continuity of power supply is guaranteed.
The technical scheme of the invention is as follows:
a method for providing graded earth leakage protection for residential areas, comprising the steps of: setting three levels of residual current protection, including a meter front main switch as the third level protection, a meter rear main switch as the second level protection and a home switch as the first level protection; the residual current protection of each grade is provided with three user coefficients of high, medium and low; and the residual current protection is combined with the user coefficient to form a graded leakage protection system, and the leakage protection of each point switch is configured based on the system and the power utilization attribute.
Further, the step of forming a graded leakage protection system by combining residual current protection and a user coefficient is as follows:
the three-level protection comprises three configuration conditions of high, medium and low; the secondary protection comprises three configuration conditions of high, medium and low; the first-level protection comprises three configuration conditions of high, medium and low.
Further, the user coefficient of each level is taken as:
the values of the three-level protection under the three user coefficients of high, medium and low are respectively as follows: 9. 6, 3;
the values of the secondary protection under three user coefficients of high, medium and low are respectively: 6. 4, 2;
the values of the primary protection under the three user coefficients of high, medium and low are respectively: 3. 2, 1;
and the values corresponding to the different user coefficients are matched with different parameters.
Further, the rated current corresponding to the value 9 is 125-250A, the leakage tripping current is 100-500 mA, and the tripping time is 0.5S; the rated current corresponding to the value 6 is 100-; the rated current corresponding to the value 4 is 63A, the leakage tripping current is 50mA, and the tripping time is 0.2S; the rated current corresponding to the value 3 is 100-125A, the leakage tripping current is 100mA, and the tripping time is 0.1S; the rated current corresponding to the value 2 is 63A, the leakage tripping current is 50mA, and the tripping time is 0.1S; the rated current corresponding to the value 1 is 63A, the leakage tripping current is 30mA, and the tripping time is 0.1S.
Further, the determination of the protection level depends only on the installation position of the switch, and is not related to the load and the number of users connected with the switch.
Further, when configuring, the value of the user coefficient of each level of protection is required to satisfy the following formula:
user coefficientThree-stageCoefficient of not less than userSecond stageCoefficient of not less than userFirst stage
And when the adjacent two-stage protection user coefficients are equal and the electrical distance is extremely short, taking the same value.
Further, when the user coefficient of the subsequent protection is high, the user coefficient of the previous protection is also high, the front-back relationship of the protection levels starts from the power supply side, the power supply side is the previous protection, and the load side is the subsequent protection.
Furthermore, the user with the third-level protection is only a single user and is not accessed to other users.
Further, the user coefficient of the three-level protection depends on the electricity utilization attribute of the user, and when the electricity utilization attribute is residents, the user coefficient is low; when the electricity consumption attribute is mixed with residents and businesses, the user coefficient is middle; when the electricity consumption property is commercial, the user factor is high.
Further, the meter front main switch is arranged at a power supply end, the meter rear main switch is arranged at the head end of the load group, and the household switch is arranged at the load end.
The invention has the beneficial effects that:
the invention configures the residual current protection at the power supply end, the head end of the load group and the load end to form a three-level protection system based on the actual operation condition of the low-voltage distribution network, forms the leakage protection system by the rated current value of the main loop, the leakage tripping current and the tripping time of the residual current protection at each level according to the user coefficient, and configures the scheme of each point in the low-voltage distribution network by combining the value taking result to realize coordination and ensure the low-voltage grading protection with accuracy, rapidity and reliability. The concept is used for giving the residual current protection fixed value and the action time of each level according to the use condition of the actual test point, so that the grading protection function of the low-voltage distribution network is realized.
Drawings
Fig. 1 is a schematic diagram of graded leakage protection.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Example 1:
a method for providing graded earth leakage protection for residential areas, comprising the steps of: setting three levels of residual current protection, as shown in fig. 1, including a meter front main switch as a third level protection, a meter rear main switch as a second level protection, and a home switch as a first level protection; the meter front main switch is configured at a power supply end, the meter rear main switch is configured at the head end of the load group, and the household switch is configured at the load end; the residual current protection of each grade is provided with three user coefficients of high, medium and low; and the residual current protection is combined with the user coefficient to form a graded leakage protection system, and the leakage protection of each point switch is configured based on the system and the power utilization attribute.
The residual current protection and the user coefficient are combined to form a graded leakage protection system which specifically comprises the following steps:
the three-level protection comprises three configuration conditions of high, medium and low; the secondary protection comprises three configuration conditions of high, medium and low; the first-level protection comprises three configuration conditions of high, medium and low.
And then, correspondingly taking the value of the user coefficient of each level as follows:
the values of the three-level protection under the three user coefficients of high, medium and low are respectively as follows: 9. 6, 3;
the values of the secondary protection under three user coefficients of high, medium and low are respectively: 6. 4, 2;
the values of the primary protection under the three user coefficients of high, medium and low are respectively: 3. 2, 1;
and the values corresponding to the different user coefficients are matched with different parameters.
Wherein the rated current corresponding to the value 9 is 125-250A, the leakage trip current is 100-500 mA, and the trip time is 0.5S; the rated current corresponding to the value 6 is 100-; the rated current corresponding to the value 4 is 63A, the leakage tripping current is 50mA, and the tripping time is 0.2S; the rated current corresponding to the value 3 is 100-125A, the leakage tripping current is 100mA, and the tripping time is 0.1S; the rated current corresponding to the value 2 is 63A, the leakage tripping current is 50mA, and the tripping time is 0.1S; the rated current corresponding to the value 1 is 63A, the leakage tripping current is 30mA, and the tripping time is 0.1S.
In the present embodiment, the determination of the protection level depends only on the installation position of the switch, regardless of the load and the number of users connected thereto. If the power supply end adopts three-level protection, the load group head end adopts two-level protection, and the load end adopts one-level protection.
When configuration is carried out, the value of the user coefficient of each level of protection is required to meet the following formula:
user coefficientThree-stageCoefficient of not less than userSecond stageCoefficient of not less than userFirst stage
And when the adjacent two-stage protection user coefficients are equal and the electrical distance is extremely short, taking the same value.
When the user coefficient of the post-stage protection is high, the user coefficient of the pre-stage protection is also high, the front-back relation of the protection level takes the power supply side as a starting point, the power supply side is the pre-stage protection, and the load side is the post-stage protection.
In this embodiment, the user with the third-level protection is only a single user, and no other user is accessed.
In the embodiment, the user coefficient of the three-level protection depends on the electricity utilization attribute, and when the electricity utilization attribute is residents, the user coefficient is low; when the electricity consumption attribute is mixed with residents and businesses, the user coefficient is middle; when the electricity consumption property is commercial, the user factor is high.
The invention configures the residual current protection at the power supply end, the head end of the load group and the load end to form a three-level protection system based on the actual operation condition of the low-voltage distribution network, forms the leakage protection system by the rated current value of the main loop, the leakage tripping current and the tripping time of the residual current protection at each level according to the user coefficient, and configures the scheme of each point in the low-voltage distribution network by combining the value taking result to realize coordination and ensure the low-voltage grading protection with accuracy, rapidity and reliability. The concept is used for giving the residual current protection fixed value and the action time of each level according to the use condition of the actual test point, so that the grading protection function of the low-voltage distribution network is realized.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. A method for providing graded earth leakage protection for residential areas, comprising the steps of: setting three levels of residual current protection, including a meter front main switch as the third level protection, a meter rear main switch as the second level protection and a home switch as the first level protection; the residual current protection of each grade is provided with three user coefficients of high, medium and low; residual current protection is combined with a user coefficient to form a graded leakage protection system, and leakage protection of switches at all points is configured based on the system and the power utilization attribute; the residual current protection and the user coefficient are combined to form a graded leakage protection system which specifically comprises the following steps:
the three-level protection comprises three configuration conditions of high, medium and low; the secondary protection comprises three configuration conditions of high, medium and low; the first-level protection comprises three configuration conditions of high, medium and low;
and (3) carrying out value taking on the user coefficient of each level:
the values of the three-level protection under the three user coefficients of high, medium and low are respectively as follows: 9. 6, 3;
the values of the secondary protection under three user coefficients of high, medium and low are respectively: 6. 4, 2;
the values of the primary protection under the three user coefficients of high, medium and low are respectively: 3. 2, 1;
the values corresponding to the different user coefficients are matched with different parameters;
the rated current corresponding to the value 9 is 125-250A, the leakage tripping current is 100-500 mA, and the tripping time is 0.5S; the rated current corresponding to the value 6 is 100-; the rated current corresponding to the value 4 is 63A, the leakage tripping current is 50mA, and the tripping time is 0.2S; the rated current corresponding to the value 3 is 100-125A, the leakage tripping current is 100mA, and the tripping time is 0.1S; the rated current corresponding to the value 2 is 63A, the leakage tripping current is 50mA, and the tripping time is 0.1S; the rated current corresponding to the value 1 is 63A, the leakage tripping current is 30mA, and the tripping time is 0.1S.
2. A method of stepped earth leakage protection in a residential area as claimed in claim 1, wherein the determination of the protection level is dependent only on the installation location of the switch, irrespective of the load and number of users connected thereto.
3. A method according to claim 1, wherein the user coefficient value of each protection level is required to satisfy the following formula:
user coefficientThree-stageCoefficient of not less than userSecond stageCoefficient of not less than userFirst stage
And when the adjacent two-stage protection user coefficients are equal and the electrical distance is extremely short, taking the same value.
4. A method according to claim 1, wherein when the user factor of the post-protection is high, the user factor of the pre-protection is high, and the front-back relationship of the protection levels is from the power source side, the power source side is the pre-protection, and the load side is the post-protection.
5. A method of stepped leakage protection for residential areas according to claim 1, wherein the users of the tertiary protection are only single users and no other users are connected.
6. A method of earth leakage protection according to claim 1, wherein the user factor of the tertiary protection depends on the electricity usage property, and is low when the electricity usage property is residential; when the electricity consumption attribute is mixed with residents and businesses, the user coefficient is middle; when the electricity consumption property is commercial, the user factor is high.
7. A method according to claim 1, wherein the front main switch is disposed at the power end, the rear main switch is disposed at the head end of the load group, and the home switch is disposed at the load end.
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