CN109599853A - A kind of SPD back-up protection device and matching process based on GDT and NTC - Google Patents
A kind of SPD back-up protection device and matching process based on GDT and NTC Download PDFInfo
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- CN109599853A CN109599853A CN201811403749.5A CN201811403749A CN109599853A CN 109599853 A CN109599853 A CN 109599853A CN 201811403749 A CN201811403749 A CN 201811403749A CN 109599853 A CN109599853 A CN 109599853A
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- Prior art keywords
- ntc
- gdt
- protection device
- spd
- current
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
-
- H—ELECTRICITY
- 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
- H02H3/08—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 responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of SPD back-up protection devices and matching process based on GDT and NTC; after the SPD back-up protection device is connected on surge protector; including breaker, thermistor and gas-discharge tube; breaker gas-discharge tube in parallel after connecting with thermistor, a pole of the gas-discharge tube and the moving contact of breaker connect.Compared with prior art, the present invention is obviously improved the surge current tolerance of fuse and breaker cooperation in SPD back-up protection.
Description
Technical field
The present invention relates to electronic equipments lightning protections to protect field, protects more particularly, to a kind of SPD standby based on GDT and NTC
Protect device and matching process
Background technique
Requirement with modern electronic equipment to lightning protection is increasingly strict, installs surge protector (Surge
Protection Device, SPD) surge on limiting circuitry and instantaneous overvoltage, the overcurrent released on route become the modern times
One of important link of shocking preventing technology.It is well known that the Important Components for constituting surge protector are varistor (MOV), and
Varistor has leakage current, in the long-term use it is possible that short circuit deterioration, brings security risk to system.This
Require SPD need to connect overcurrent protective device use.In the standard of current IEC standard and the country, usually select common
Overcurrent protection fuse FUSE and breaker MCB are as SPD reserve protection.But since FUSE and MCB mainly make
For the protective device of power frequency overcurrent, surge current tolerance is not highly desirable.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind to be based on GDT and NTC
SPD back-up protection device matching method.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of SPD back-up protection device based on GDT and NTC, after being connected on surge protector, which is characterized in that including disconnected
Road device, thermistor and gas-discharge tube, the breaker gas-discharge tube in parallel, gas after connecting with thermistor
One pole of body discharge tube and the moving contact of breaker connect.
The thermistor is negative tempperature coefficient thermistor.
A kind of fitting method of the SPD back-up protection device based on GDT and NTC, comprising the following steps:
1) the number of turns of coil is determined according to the amplitude of the desired disjunction power frequency overcurrent of SPD back-up protection device SSD；
2) GDT (or discharging gap), simultaneous selection GDT of corresponding through-current capability are obtained according to the maximum discharge current of SPD
Voltage class；
3) resistance value of NTC is selected according to the divided relation of surge current；
4) diameter for adjusting NTC, calorific value when power current being made to flow through NTC are no more than its maximum power dissipation, NTC are avoided to damage
It is bad.
In the step 1), the number of turns by increasing coil shortens the break time of breaker and reduces disjunction power frequency mistake
Electric current.
In the step 2), guarantee that the minimum direct current breakdown voltage of GDT is higher than line when being used in series according to GDT and MOV
The requirement of road voltage peak selects voltage class.
In the step 3), the resistance of NTC is selected according to the shorter principle of resistance value smaller break time under identical NTC diameter
Value, while guaranteeing surge current tolerance.
In the step 4), according to the principle that diameter smaller break time under identical NTC resistance value is shorter, make NTC most
Big power consumption reduces.
Compared with prior art, the invention has the following advantages that
The present invention by the way of gas-discharge tube in parallel, is filled using series thermal-sensitive resistance instead of existing overcurrent protection
Set it is middle by the way of single fuse or breaker, and respectively to wherein element carry out type selecting, be obviously improved fuse
With the surge current tolerance of breaker cooperation.
Detailed description of the invention
Fig. 1 is of the invention and circuit structure diagram.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
The present invention proposes a kind of dedicated back-up protection device of the SPD based on GDT and NTC and its fitting method, the dedicated standby of SPD
After the circuit structure of protector is as shown in Figure 1, the SPD back-up protection device is connected on surge protector, including breaker, temperature-sensitive electricity
Resistance and gas-discharge tube, breaker connect with thermistor after parallel connection gas-discharge tube, a pole of the gas-discharge tube and
The moving contact of breaker connects.
Engagement process the following steps are included:
1) the number of turns that coil is determined according to the amplitude of the desired disjunction power frequency overcurrent of SSD, enables SSD in standard NB/
Movement in time as defined in T42150-2018；
2) GDT (or discharging gap) of corresponding through-current capability is found according to the maximum discharge current of SPD, while according to GDT
The minimum direct current breakdown voltage of GDT need to be made to be higher than the requirement of line voltage distribution peak value to select different voltages when being used in series with MOV
The GDT of grade；
3) NTC of suitable resistance value is selected from the divided relation of surge current；
4) calorific value when making power current flow through NTC by adjusting the diameter of NTC is no more than its maximum power dissipation, to avoid
The damage of NTC in test.
Specific step is as follows:
1, the number of turns that coil is determined according to the amplitude of the desired disjunction power frequency overcurrent of SSD, enables SSD in standard NB/
Movement in time as defined in T42150-2018:
Study whole power frequency short circuit current breaking capacity:
It is with discharge capacity again after the NTC with rated current for the breaker series connection 10D-25 of 10A, 20A, 25A respectively
The discharge tube that 20kA dc breakdown voltage is 500V is in parallel, studies whole power frequency short circuit current breaking capacity, as shown in table 1
As known from Table 1, the rated current of breaker is smaller, and break time is shorter, i.e. the number of turns of increase coil can shorten
Break time, that is, can be become smaller by increasing coil turn to enable the power frequency overcurrent of disjunction.
Influence of 1 breaker rated current of table to breaking capacity
2, the GDT (or discharging gap) of corresponding through-current capability is found according to the maximum discharge current of SPD, while according to GDT
The minimum direct current breakdown voltage of GDT need to be made to be higher than the requirement of line voltage distribution peak value to select different voltages when being used in series with MOV
The GDT of grade；
By rated current be 63A fuse and discharge capacity be 20kA, dc breakdown voltage be the discharge tube of 500V simultaneously
Connection, studies whole surge current tolerance, as shown in table 2.
2 FUSE of table and GDT it is simple it is in parallel after surge current tolerance
Note: due to the error of each coil measurement, the electric current after shunting is added and is not equal to total current.
By rated current be 10A breaker and discharge capacity be 20kA, dc breakdown voltage be the discharge tube of 500V simultaneously
Connection, studies whole surge current tolerance, as shown in table 3.
3 MCB of table and GDT it is simple it is in parallel after surge current tolerance
Note 1: when total current is 50kA, the GDT that nominal discharge capacity is 40kA has been replaced；
Note 2: due to the error of each coil measurement, the electric current after shunting is added and is not equal to total current.
From table 4 it is recognised that the surge current tolerance that rated current is 63A fuse is 17kA, can know from table 2
Road after the discharge tube of one 20kA 500V of parallel connection, the surge current tolerance of fuse can be promoted to 25kA；From table 5
It is recognised that the surge current tolerance that rated current is 10A breaker is 15kA, it is from table 3 it is recognised that one in parallel
After the discharge tube of 20kA 500V, the surge current tolerance of breaker can be promoted to 45kA.
Single tolerance of 4 MCB of table under 10/350 impact
Single and 15 tolerances of 5 MCB of table under 8/20 impact
Infuse 1:IMWFor the current peak for being resistant to single surge current；I15For the current peak for being resistant to 15 surge currents.
3, the NTC of suitable resistance value is selected from the divided relation of surge current；
Breaker with rated current for 10A connect respectively 5D-25 and 10D-25 NTC after again with discharge capacity for 20kA
Direct current, the discharge tube that breakdown voltage is 500V is in parallel, studies whole power frequency short circuit current breaking capacity, as shown in table 6.
As known from Table 6, when NTC diameter is identical, resistance value is smaller, and break time is shorter, but in view of surge current
Shunting effect, resistance value can not select too small, otherwise will affect surge current tolerance.
Influence of the 6 NTC resistance value of table to breaking capacity
Influence of the 7 NTC diameter of table to breaking capacity
Note: the test of second combined floodgate angle of every group of sample is that the test of and then first combined floodgate angle carries out, by
So that its own impedance is become smaller in the fever of NTC, break time is caused to be obviously reduced.
4, calorific value when making power current flow through NTC by adjusting the diameter of NTC is no more than its maximum power dissipation, to avoid
The damage of NTC in test.
Breaker with rated current for 10A connect respectively 10D-11,10D-20 and 10D-25 NTC after again with through-flow appearance
Amount is 20kA, and the discharge tube that dc breakdown voltage is 500V is in parallel, whole power frequency short circuit current breaking capacity is studied, such as table 7
It is shown.
As known from Table 7, when NTC resistance value is identical, diameter is smaller, and break time is shorter, but diameter is smaller, and NTC is most
Big power consumption also accordingly becomes smaller, just very possible because calorific value is greater than maximum power dissipation and damages NTC.
Claims (7)
1. a kind of SPD back-up protection device based on GDT and NTC, after being connected on surge protector (SPD), which is characterized in that including
Breaker (MCB), thermistor (NTC) and gas-discharge tube (GDT), the breaker (MCB) and thermistor (NTC) go here and there
Gas-discharge tube (GDT) in parallel after connection, a pole of the gas-discharge tube (GDT) is connect with the moving contact of breaker (MCB).
2. a kind of SPD back-up protection device based on GDT and NTC according to claim 1, which is characterized in that the heat
Quick resistance (NTC) is negative tempperature coefficient thermistor.
3. a kind of fitting method of the SPD back-up protection device based on GDT and NTC, which comprises the following steps:
1) the number of turns of coil is determined according to the amplitude of the desired disjunction power frequency overcurrent of SPD back-up protection device SSD；
2) GDT of corresponding through-current capability, the voltage class of simultaneous selection GDT are obtained according to the maximum discharge current of SPD；
3) resistance value of NTC is selected according to the divided relation of surge current；
4) diameter for adjusting NTC, calorific value when power current being made to flow through NTC are no more than its maximum power dissipation, NTC are avoided to damage.
4. a kind of SPD back-up protection device matching method based on GDT and NTC according to claim 3, feature exist
In in the step 1), the number of turns by increasing coil shortens the break time of breaker and reduces disjunction power frequency overcurrent.
5. a kind of SPD back-up protection device matching method based on GDT and NTC according to claim 3, feature exist
In in the step 2), the minimum direct current breakdown voltage of guarantee GDT is higher than line voltage distribution when being used in series according to GDT and MOV
The requirement of peak value selects voltage class.
6. a kind of SPD back-up protection device matching method based on GDT and NTC according to claim 3, feature exist
In, in the step 3), according to resistance value smaller break time under identical NTC diameter it is shorter principle selection NTC resistance value, together
When guarantee surge current tolerance.
7. a kind of SPD back-up protection device matching method based on GDT and NTC according to claim 3, feature exist
According to the principle that diameter smaller break time under identical NTC resistance value is shorter, making the maximum power dissipation of NTC in the step 4)
Reduce.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811403749.5A CN109599853B (en) | 2018-11-23 | 2018-11-23 | SPD backup protector based on GDT and NTC and matching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811403749.5A CN109599853B (en) | 2018-11-23 | 2018-11-23 | SPD backup protector based on GDT and NTC and matching method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109599853A true CN109599853A (en) | 2019-04-09 |
| CN109599853B CN109599853B (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811403749.5A Active CN109599853B (en) | 2018-11-23 | 2018-11-23 | SPD backup protector based on GDT and NTC and matching method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101320658A (en) * | 2008-06-25 | 2008-12-10 | 上海电器科学研究所（集团）有限公司 | Surge protector with backup protection |
| CN201523229U (en) * | 2009-11-02 | 2010-07-07 | 杭州华三通信技术有限公司 | Surge protective circuit and device containing common mode choke |
| CN105071363A (en) * | 2015-08-14 | 2015-11-18 | 深圳康普盾科技股份有限公司 | SPD backup protector |
| CN206441677U (en) * | 2017-01-11 | 2017-08-25 | 浙江正泰电器股份有限公司 | The backup protection breaker of surge protector |
| CN206575151U (en) * | 2017-03-09 | 2017-10-20 | 苏州未来电器股份有限公司 | The reserve protection and electronic securing device of Surge Protector |
| CN207098606U (en) * | 2017-06-26 | 2018-03-13 | 施耐德电器工业公司 | Power source surge protector reserve protection and power surge protection system |
-
2018
- 2018-11-23 CN CN201811403749.5A patent/CN109599853B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101320658A (en) * | 2008-06-25 | 2008-12-10 | 上海电器科学研究所（集团）有限公司 | Surge protector with backup protection |
| CN201523229U (en) * | 2009-11-02 | 2010-07-07 | 杭州华三通信技术有限公司 | Surge protective circuit and device containing common mode choke |
| CN105071363A (en) * | 2015-08-14 | 2015-11-18 | 深圳康普盾科技股份有限公司 | SPD backup protector |
| CN206441677U (en) * | 2017-01-11 | 2017-08-25 | 浙江正泰电器股份有限公司 | The backup protection breaker of surge protector |
| CN206575151U (en) * | 2017-03-09 | 2017-10-20 | 苏州未来电器股份有限公司 | The reserve protection and electronic securing device of Surge Protector |
| CN207098606U (en) * | 2017-06-26 | 2018-03-13 | 施耐德电器工业公司 | Power source surge protector reserve protection and power surge protection system |
Non-Patent Citations (1)
| Title |
|---|
| 殷要红: "具有后续保护的SPD后备保护方案", 《农村电气化》 * |
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| CN109599853B (en) | 2020-09-01 |
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