CN210982673U - DC high-speed switch DC air charging current on-off test loop - Google Patents
DC high-speed switch DC air charging current on-off test loop Download PDFInfo
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- CN210982673U CN210982673U CN201921074814.4U CN201921074814U CN210982673U CN 210982673 U CN210982673 U CN 210982673U CN 201921074814 U CN201921074814 U CN 201921074814U CN 210982673 U CN210982673 U CN 210982673U
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Abstract
The utility model discloses a DC high-speed switch DC air charging current breaking test loop, which comprises a first auxiliary breaker, a second auxiliary breaker, a capacitor bank, a resistor, an ammeter, a first voltmeter, a second voltmeter and a DC high-voltage generator; the direct-current high-voltage generator, the second auxiliary circuit breaker and the capacitor bank are connected in series to form a loop; the capacitor bank, the resistor and the second voltmeter are connected in series to form a loop; one end of the first auxiliary circuit breaker is connected with the resistor, and the other end of the first auxiliary circuit breaker is used for being connected with one end of the tested circuit breaker; one end of the first voltmeter is connected to a line between the first auxiliary circuit breaker and the tested circuit breaker, and the other end of the first voltmeter is connected to a phase connection line of the second voltmeter and the capacitor bank. The direct-current high-speed switch direct-current air charging current breaking test loop can break the capacity of a breaker for breaking the air charging current of a long-distance high-voltage direct-current line.
Description
Technical Field
The utility model relates to a test circuit, concretely relates to direct current high speed switch direct current empty charging current breaking test circuit.
Background
A High Speed Switch (HSS) is mainly applied to a multi-terminal flexible dc power transmission system. The purpose of configuring the direct-current high-speed switch is to realize on-line switching of a third station of the direct-current system and high-speed isolation of direct-current line faults, and improve the reliability and the availability of the whole direct-current system.
The direct current high-speed switch generally adopts open column type circuit breaker type, and operating device can adopt hydraulic pressure or spring, in order to cooperate the coordinated control of many end systems, realizes sending end, receiving end's online input and withdraw from, and the cooperation requirement to equipment key performance parameter is very high, mainly has following characteristics:
(1) should possess an inherent long-term overload capability (at maximum ring temperature) of not less than 1.05p.u. system rated delivery capacity;
(2) the direct current arc burning tolerance is strong;
(3) the capacity of transferring the DC line idle charging current is provided;
(4) the brake-separating device has the advantages of high brake-separating speed, reliable mechanical action characteristic and no action rejection or misoperation.
Therefore, before the HSS is applied, the overall key performance of the HSS needs to be tested, and particularly, whether the HSS has the capability of transferring the idle charge current of the dc line needs to be tested and evaluated, but at present, there is no relevant test and evaluation method.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art not enough, provide a test circuit is cut off to the empty charging current of direct current high speed switch direct current to the ability to the empty charging current of direct current circuit of HSS tests the examination.
In order to achieve the above purpose, the technical scheme of the utility model is that:
a DC high-speed switch DC no-load charging current breaking test loop comprises a first auxiliary breaker, a second auxiliary breaker, a capacitor bank, a resistor, an ammeter, a first voltmeter, a second voltmeter and a DC high-voltage generator; wherein the content of the first and second substances,
the direct-current high-voltage generator, the second auxiliary circuit breaker and the capacitor bank are connected in series to form a loop;
the capacitor bank, the resistor and the second voltmeter are connected in series to form a loop;
one end of the first auxiliary circuit breaker is connected with the resistor, and the other end of the first auxiliary circuit breaker is used for being connected with one end of the tested circuit breaker;
one end of the first voltmeter is connected to a line between the first auxiliary circuit breaker and the tested circuit breaker, and the other end of the first voltmeter is connected to a connecting line of the second voltmeter and the capacitor bank;
and one end of the ammeter is used for being connected with the other end of the tested circuit breaker, and the other end of the ammeter is grounded and connected to a line connected with the second voltmeter and the capacitor bank.
The direct-current high-speed switch direct-current air charging current on-off test loop further comprises a mechanical characteristic monitoring device, and the mechanical characteristic monitoring device is used for acquiring time-contact speed and time-contact travel curves when the tested breaker T0 is opened.
Compared with the prior art, the utility model, its beneficial effect lies in:
the direct-current high-speed switch direct-current air charging current breaking test loop can break the capacity of a breaker for breaking the air charging current of a long-distance high-voltage direct-current line.
Drawings
Fig. 1 is a circuit diagram of a dc air charging current breaking test loop of a dc high-speed switch according to an embodiment of the present invention;
fig. 2 is an operation timing diagram of the circuit breaker.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example (b):
referring to fig. 1, the DC high-speed switch DC idle charge current breaking test circuit provided in this embodiment includes a first auxiliary breaker AB1, a second auxiliary breaker AB2, a capacitor bank C, a resistor R, an ammeter a, a first voltmeter V1, a second voltmeter V2, and a DC high voltage generator DC.
The direct-current high-voltage generator CC, the second auxiliary circuit breaker AB2 and the capacitor bank C are connected in series to form a loop; the capacitor bank C, the resistor R and the second voltmeter V2 are connected in series to form a loop; one end of the first auxiliary breaker AB1 is connected with the resistor R, and the other end is used for being connected with one end of the tested breaker T0; one end of the first voltmeter V1 is connected to a line between the first auxiliary breaker AB1 and the tested breaker T0, and the other end is connected to a phase connection line between the second voltmeter V2 and the capacitor bank C; one end of the ammeter A is connected with the other end of the tested breaker T0, and the other end is grounded and connected with a line connected with the second voltmeter V2 and the capacitor bank C.
Therefore, the circuit breaker can be used for testing the capacity of breaking the idle charging current of the long-distance high-voltage direct-current line by an equivalent simulation loop through the arrangement.
In the initial state, the first auxiliary breaker AB1 and the second auxiliary breaker AB2 are in the open state, the tested breaker T0 is in the closed state, and the DC high voltage generator DC can output the DC high voltage to the capacitor bank C to a specified value.
Specifically, when this direct current high speed switch direct current empty charge current breaking test circuit tests, it includes following step:
1) configuring test loop parameters
Obtaining a resistor R as U/I according to the direct current I cut off by the test target and the recovery voltage U;
configuring the capacitor bank to determine primarily the capacitance C of the capacitor bank and the internal resistance R of the capacitor bankCAfter the capacitor bank is charged, the capacitor bank and the resistive load which are charged in advance are used to form a direct current loop, so that the parameters of the capacitor can be obtained according to the following formula.
I＝(U+IRC)ωC
The matching operation interval time T1 between the auxiliary breaker AB2 and the auxiliary breaker AB1 and the matching operation interval time T2 between the auxiliary breaker AB1 and the tested breaker T0 are required to be not longer than the time T when the current decays to I after the test loop is conducted, otherwise, the current of the tested breaker is smaller than the required value I, and the whole time constant of the specific loop is determined and can be obtained by the following formula.
The voltage grades and the measuring ranges of the ammeter A, the voltmeter V1 and the voltmeter V2 are higher than the experimental requirement values.
2) Capacitor bank energy storage
The auxiliary circuit breaker AB2 is switched on, and the DC high-voltage generator DC charges and stores energy to the capacitor bank to achieve U + IRCAfter this, the auxiliary breaker AB2 is opened.
3) Capacitor bank discharge
After the delay of the T1 operation interval time, the auxiliary breaker AB1 is switched on, the test loop is conducted, the loop current has a certain attenuation amplitude under the influence of the RC circuit, and before the loop current is attenuated to the test current I, the tested breaker T0 is switched off after the delay of the T2 operation interval time.
4) Switching on and off DC current
The method comprises the steps of generating a direct current arc at a switch fracture in the T0 brake opening process of the circuit breaker, wherein the direct current arc can be equivalent to a dynamic resistor, gradually increasing the distance between a moving arc contact and a static arc contact along with the brake opening process, gradually increasing the resistance of the direct current arc, gradually increasing the voltage at two ends of the switch, gradually reducing the current of a loop, and recording the time of T3 arc burning, wherein the product of the time of T3 arc burning and the average speed v of the breaker brake opening is required to be smaller than the designed opening distance L of the contacts, otherwise, the brake opening motion stops, the direct current arc cannot be extinguished, and the failure of the switch opening is caused.
5) Test criterion
The initial state of the test sample is a switch-on position, the loop is switched on by the loop auxiliary switch, then the test sample is switched off within the through-current time T2, after the arcing time T3, the test sample normally switches on and off the test current I, and the arc contact can endure the recovery voltage U after switching on and off without re-breakdown.
Positive and negative polarities were tested 10 times each.
The test article (i.e., the circuit breaker under test) can be determined to pass the test by the number m of times that the test article completes the disconnection of the dc idle charge current of the predetermined positive and negative polarities.
Therefore, by applying the direct current high-speed switch direct current air charging current on-off test circuit, the direct current air charging current on-off test of the positive polarity and the negative polarity of the circuit breaker can be carried out, so as to verify whether the circuit breaker meets the performance requirement of transferring the direct current line air charging current.
As a preferable preference of the dc high-speed switch dc idle charge current breaking test loop provided in this embodiment, the test loop further includes a mechanical characteristic monitoring device for obtaining a time-contact speed and a time-contact travel curve when the tested circuit breaker T0 is opened. The operation sequence of the circuit breaker is as follows:
AB 2O (open-gate state) - - - - -C- -O
AB 1- -O (open-door state) - - - - - - - - - - - - - -C
T0- -C (closed state) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
As shown in particular in fig. 2.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (3)
1. A DC high-speed switch DC air charging current breaking test loop is characterized by comprising a first auxiliary breaker, a second auxiliary breaker, a capacitor bank, a resistor, an ammeter, a first voltmeter, a second voltmeter and a DC high-voltage generator; wherein the content of the first and second substances,
the direct-current high-voltage generator, the second auxiliary circuit breaker and the capacitor bank are connected in series to form a loop;
the capacitor bank, the resistor and the second voltmeter are connected in series to form a loop;
one end of the first auxiliary circuit breaker is connected with the resistor, and the other end of the first auxiliary circuit breaker is used for being connected with one end of the tested circuit breaker;
one end of the first voltmeter is connected to a line between the first auxiliary circuit breaker and the tested circuit breaker, and the other end of the first voltmeter is connected to a connecting line of the second voltmeter and the capacitor bank;
and one end of the ammeter is used for being connected with the other end of the tested circuit breaker, and the other end of the ammeter is grounded and connected to a line connected with the second voltmeter and the capacitor bank.
2. The DC high-speed switch DC air-charge current breaking test loop of claim 1, further comprising a mechanical characteristic monitoring device, wherein the mechanical characteristic monitoring device is used for acquiring time-contact speed and time-contact travel curves when the tested breaker T0 is opened.
3. The dc high-speed switch dc air-charge current breaking test circuit of claim 1, wherein in an initial state, the first and second auxiliary breakers are in an open state, the circuit breaker to be tested is in a closed state, and the dc high voltage generator outputs a dc high voltage to the capacitor bank to a specified value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921074814.4U CN210982673U (en) | 2019-07-10 | 2019-07-10 | DC high-speed switch DC air charging current on-off test loop |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921074814.4U CN210982673U (en) | 2019-07-10 | 2019-07-10 | DC high-speed switch DC air charging current on-off test loop |
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| CN210982673U true CN210982673U (en) | 2020-07-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376512A (en) * | 2019-07-10 | 2019-10-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of DC high-speed switch direct current sky fills current breaking test circuit |
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2019
- 2019-07-10 CN CN201921074814.4U patent/CN210982673U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376512A (en) * | 2019-07-10 | 2019-10-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of DC high-speed switch direct current sky fills current breaking test circuit |
| CN110376512B (en) * | 2019-07-10 | 2024-04-26 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current high-speed switch direct-current air-charge current breaking test loop |
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