CN213069091U - Relay switch device full-load test device powered by low-power supply - Google Patents
Relay switch device full-load test device powered by low-power supply Download PDFInfo
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- CN213069091U CN213069091U CN202020215386.9U CN202020215386U CN213069091U CN 213069091 U CN213069091 U CN 213069091U CN 202020215386 U CN202020215386 U CN 202020215386U CN 213069091 U CN213069091 U CN 213069091U
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Abstract
The utility model provides a relay switch device full load test device powered by a low-power supply, which comprises a high-voltage circuit and a low-voltage circuit; the high-voltage circuit includes: the low-power high-voltage power supply, the resistor and the first switch are connected in series to form a first loop, the output end of the low-power high-voltage power supply is connected with two collecting terminals of the energy storage capacitor bank in parallel, and the relay switch device is connected with the first loop in parallel; the low-voltage circuit includes: the low-voltage power supply and the second switch are connected in parallel to form a second loop, and the relay switch device is connected in parallel with the second loop. The utility model discloses a device is owing to adopt the parallelly connected combination of miniwatt high voltage power supply and energy storage capacitor group, consequently can be equivalent in the twinkling of an eye for a high-power electric capacity energy storage power supply that can export rated voltage, rated current to replace traditional high-power. This greatly reduces the cost of the test power supply.
Description
Technical Field
The utility model relates to a relay switch device full load test technical field especially relates to the relay switch device full load test device who adopts the low-power mains operated and corresponding power timesharing connecting circuit.
Background
The relay switch device is a switch component, and must bear the voltage and current instantaneous electric stress impact caused by switching on and switching off, and must bear the power consumption caused by internal resistance caused by maintaining current after switching on.
In order to ensure the reliability of the relay switching device, a full load test is usually performed on the relay switching device, that is, a loop formed by connecting resistors equivalent to a load in series with the relay switching device is powered up under a rated voltage and current condition, and then the relay switching device is controlled to perform continuous operations of turning on, keeping and turning off at certain time intervals. The purpose of the test was to ensure that the relay switching device withstood the corresponding voltage current surges and power consumption in these three operations.
In the three actions of switching on, switching on and keeping and switching off, the time of the switching on and keeping stage is longest and the output power of the power supply is the largest. At this time, because the internal resistance of the relay switch device is very small, the internal power consumption of the relay switch device is low, and the main power of the power supply is output to the load. The load resistor is selected to make the current of the loop reach the rated current when the relay switch device is switched on under the rated voltage. According to the relevant standards, relay switching devices of high reliability class must be subjected to full load tests.
Along with the increasing of the production quantity of relay switch devices, the rated voltage and current of a single relay switch device are increased, and the direct-current relay switch device, the alternating-current relay switch device, the high-power contactor and the like are provided. In order to reduce the power consumption of a power supply and a load in the starting stage, an energy-saving technology is developed, a constant current source with the voltage lower than the rated voltage and a zero load resistor form a conducting loop in the starting and maintaining stage, and the conducting loop replaces the original full-voltage full-current relay switch device with the rated voltage and the load resistor, so that the invalid energy consumption in the test process is greatly reduced. The full-power supply capable of outputting full-voltage full current by the energy-saving technology only works in the transient state of switching on and switching off of the relay switch device, namely, in a full-load test, the full-power supply can work in a transient power output mode in a series of periods with equal time intervals, and the effective working time is extremely short. Therefore, if each relay switching device is dedicated to a full power supply, the power supply will have very low operating efficiency. If this solution is used in mass production, a large number of full power supplies are still required, resulting in a very high cost of the test equipment.
There are solutions where several electrical switches share one high power supply, although the cost can be reduced to some extent, the individual price for high power supplies, such as several tens to several hundreds of kW, is still too high. And if the tested switching speed is higher, the number of relay switches which can be shared is still limited. In batch production or life test, when a plurality of relay switching devices are tested in the same batch, a plurality of high-cost and high-power supplies are still needed, so that the test cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an aim at provides the relay switch device full load test device and the method that adopt the low-power mains operated, has greatly reduced the cost of experimental power.
In particular, the utility model provides a relay switch device full load test device which adopts a low-power supply to supply power, the test device comprises a high-voltage circuit and a low-voltage circuit, wherein,
the high-voltage circuit includes: the low-power high-voltage power supply, the resistor and the first switch are connected in series to form a first loop, the output end of the low-power high-voltage power supply is connected with two collecting terminals of the energy storage capacitor bank in parallel, and the relay switch device is connected with the first loop in parallel;
the low-voltage circuit includes: the low-voltage power supply and the second switch are connected in parallel to form a second loop, and the relay switch device is connected in parallel with the second loop.
Preferably, the low-voltage circuit further includes: a diode in series with the second loop;
one end of the resistor is connected with the negative electrode of the low-power high-voltage power supply and one output end of the energy storage capacitor bank, and the other end of the resistor is connected with the first port of the relay switch device, one end of the second switch and the negative electrode of the low-voltage power supply; the other end of the second switch and the positive electrode of the low-voltage power supply are connected with the anode of the diode, the cathode of the diode is respectively connected with one end of the first switch and the second port of the relay switch device, and the other end of the first switch is respectively connected with the positive electrode of the low-power high-voltage power supply and the other output end of the energy storage capacitor bank.
Preferably, the low-voltage circuit further includes: a third switch in series with the second circuit;
one end of the resistor is connected with the negative electrode of the low-power high-voltage power supply and one output end of the energy storage capacitor bank, and the other end of the resistor is connected with the first port of the relay switch device, one end of the second switch and the negative electrode of the low-voltage power supply; the other end of the second switch and the positive electrode of the low-voltage power supply are connected with one end of a third switch, the other end of the third switch is respectively connected with one end of a first switch and a second port of the relay switch device, and the other end of the first switch is respectively connected with the positive electrode of the low-power high-voltage power supply and the other output end of the energy storage capacitor bank.
Preferably, the first switch is a single-pole double-throw switch, one end of the resistor is respectively connected with the negative electrode of the low-power high-voltage power supply and one output end of the energy storage capacitor bank, and the other end of the resistor is respectively connected with the negative electrode of the low-voltage power supply, one end of the second switch and the first port of the relay switch device; the second port of the relay switching device is connected with the first common port of the first switch; and a second port of the first switch is connected with the anode of the low-power high-voltage power supply and the other output end of the energy storage capacitor bank, and a third port of the first switch is respectively connected with the anode of the low-voltage power supply and the other end of the second switch.
Preferably, the high voltage circuit further includes: an inductor coil; one output end of the low-power high-voltage power supply is connected with one collecting wiring end of the energy storage capacitor bank, the other output end of the low-power high-voltage power supply is connected with one end of the inductance coil, and the other end of the inductance coil is connected with the other collecting wiring end of the energy storage capacitor bank.
Preferably, the energy storage capacitor bank is formed by connecting a plurality of capacitors in parallel and series.
Preferably, the relay switching device includes: the direct current relay, the alternating current relay, the high-power contactor, the solid relay switch device and the semiconductor power switch device, wherein the semiconductor power switch device comprises a power MOS, an IGBT, a thyristor, silicon carbide and a silicon controlled rectifier device.
According to another aspect of the present invention, in the power time-sharing connection device of the relay switching device full-load test device using a low-power supply to supply power, in the relay switching device full-load test without the energy saving function, the non-energy-saving relay switching device test circuit includes a load resistor and a relay switching device which are connected in series; the main power supply is a low-power high-voltage power supply and an energy storage capacitor bank which are connected in parallel, wherein the capacity of the energy storage capacitor bank is far larger than the rated power of the relay switching device;
the main power supply is connected with a plurality of non-energy-saving relay switch device test circuits with set sequence positions in a time-sharing manner; for the circuit of the current selected sequence position, the main power supply supplies power to the test circuit of the non-energy-saving relay switch device of the selected sequence position between a first safety moment before the relay switch device is switched on and a second safety moment after the relay switch device is switched off; after the second safety moment, the main power supply supplies power to the test circuit of the non-energy-saving relay switch device at the next sequence position;
the on-hold time period of any non-energy-saving relay switch device test circuit is shorter than the off-hold time period.
The utility model discloses a device is owing to adopt the parallelly connected combination of miniwatt high voltage power supply and energy storage capacitor group, consequently can be equivalent in the twinkling of an eye for a high-power electric capacity energy storage power supply that can export rated voltage, rated current to replace traditional high-power. This greatly reduces the cost of the test power supply.
Further, when power pack energy storage power capacity was far greater than the relay switch rated power that is experimental to and open and keep, turn-off when keeping long longer the condition, can also with the utility model discloses a timesharing of power is applied to the power is connected to reduce the cost of power more, improved test efficiency.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale.
In the drawings:
FIG. 1 is a schematic diagram of a full-load test device of a relay switching device powered by a low-power supply in example 1;
FIG. 2 is a schematic diagram of a full-load test device of a relay switching device powered by a low-power supply in embodiment 2;
FIG. 3 is a schematic diagram of a full-load test device of a relay switching device powered by a low-power supply in example 3;
FIG. 4 is a schematic diagram of a full-load test device of a relay switching device powered by a low-power supply in example 4;
fig. 5 is an application of the relay switching device full-load test device powered by a low-power supply in a power supply time-sharing connection circuit.
Fig. 6 is a schematic diagram of a connection form of one embodiment of a plurality of capacitors in an energy storage capacitor bank.
Detailed Description
In a full-load test of a relay switch device switch, a low-power high-voltage power supply is adopted, the power supply voltage is more than or equal to the rated voltage of the relay switch device switch, and the power supply current is far less than the rated current of the relay switch. The output end of the low-power high-voltage power supply is connected with two collecting terminals of an energy storage capacitor bank in parallel. As shown in fig. 6, the two collecting terminals are respectively at two ends a and b, and the output end of the low-power high-voltage power supply is connected to the two ends a and b. The energy storage capacitor bank is internally provided with a plurality of capacitors which are connected in series and in parallel, and the series-parallel connection mode in the capacitor bank can be adjusted according to the parameters such as the capacitance of the capacitors, so that higher voltage can be borne, larger current can be discharged, and the high-voltage large-current energy storage capacitor bank is formed. One way of connecting the capacitors in the energy storage capacitor bank is shown in fig. 6. The capacitor bank has two collecting terminals, which are equivalent to a high-voltage and high-current energy storage capacitor.
After the low-power high-voltage power supply is connected with the energy storage capacitor bank in parallel, the low-power high-voltage power supply can be instantaneously equivalent to a high-power capacitor energy storage power supply capable of outputting rated voltage and rated current, so that the high-power capacitor energy storage power supply can replace the traditional high-power supply and is used for a test current loop formed by a relay switch to be tested and a load resistor.
In the test, the relay switch has two steady states of on-hold and off-hold, and also has two transient states of on-moment and off-moment. In the existing energy-saving relay switch load condition test, a high-power supply is used in two transient time periods of the switching-on moment and the switching-off moment of a relay switch, the length of the time period is related to the switching-on and switching-off speeds of the relay switch, generally between uS and mS, the mechanical relay switch speed is slow, and the semiconductor switch device speed is fast. The relay switch range applicable to the invention comprises: the power supply comprises a direct current relay switch device, an alternating current relay switch device, a high-power contactor, a solid relay switch device and a semiconductor three-terminal power switch device with non-isolated input and output, such as a power MOS, an IGBT, a thyristor, silicon carbide, a silicon controlled rectifier and the like.
Example 1
As shown in fig. 1, the relay switching device full-load test device powered by a low-power supply comprises a high-voltage circuit and a low-voltage circuit. The high-voltage circuit includes: the low-power high-voltage power supply E, the resistor R and the first switch S1 are connected in series to form a first loop, the output end of the low-power high-voltage power supply E is connected with two collecting terminals of the energy storage capacitor bank C in parallel, and the relay switch device K is connected with the first loop in parallel. The low-voltage circuit includes: the low-voltage power supply Y and the second switch S2 are connected in parallel to form a second loop, and the relay switch device K is connected in parallel with the second loop. The low-voltage circuit further includes: a diode D in series with the second loop.
One end of the resistor R is connected with the negative electrode of the low-power high-voltage power supply E and one output end of the energy storage capacitor bank C respectively, and the other end of the resistor R is connected with the first port of the relay switch device K, one end of the second switch S2 and the negative electrode of the low-voltage power supply Y respectively; the other end of the second switch S2 and the anode of the low-voltage power supply Y are connected with the anode of a diode D, the cathode of the diode D is respectively connected with one end of the first switch S1 and the second port of the relay switch device K, and the other end of the first switch S1 is respectively connected with the anode of the low-power high-voltage power supply E and the other output end of the energy storage capacitor bank C.
The relay switching device includes four actions: turn-on instant, turn-on hold, turn-off instant, turn-off hold. Therefore, the method for reducing the energy cost of the full-load test device of the relay switch device powered by the low-power supply comprises the following steps:
s1: when the relay switch device is in a turn-off holding period, the output voltage of the low-power high-voltage power supply is the test voltage of the relay switch device switch, and the low-power high-voltage power supply is fully charged by the energy storage capacitor bank, so that the high voltage required by the relay switch load condition test is achieved.
S2: the second switch is in a closed conducting state, the first switch is closed, the relay switch device is in a conducting moment, the energy storage capacitor bank discharges to the relay switch device rapidly, the maximum current amplitude is limited to the rated current of the relay switch by the load resistor, the voltage drop amplitude is less than 10% when the capacitor discharges, and the total capacity of the energy storage capacitor bank needs to be ensured. If the rated current of the relay switch to be tested is large and the current rising speed is slow, a relatively large capacity is needed, and otherwise, a relatively small capacity is needed.
S3: and when the relay switch device is in the on-keeping period, the first switch and the second switch are switched off, the low-voltage power supply provides rated current for the relay switch device, and the rated current of the whole on-keeping stage is maintained to flow through the switched-on relay switch. At this time, in the other circuit, the low-power high-voltage power supply starts to charge the energy storage capacitor bank quickly.
S4: the relay switching device is turned off.
The turning-off instant action of step S4 specifically includes the following steps:
s401: after the connection and the maintenance are finished, the relay switch device is quickly disconnected with the low-voltage constant-current power supply, namely the second switch is closed;
s402: after the second switch is closed, the relay switch device is immediately reconnected with the energy storage power supply of the high-voltage capacitor bank and the resistance load, the discharging current of the energy storage power supply is still the rated current, the voltage at two ends of the load resistor is the test voltage, and at the moment, the relay switch is immediately turned off, namely, the relay switch enters the turn-off transient state. Namely, the first switch is closed, the energy storage capacitor bank discharges to the relay switch device, and the switch of the relay switch device is in the turn-off moment.
The voltage of the relay switch is rapidly increased to a test voltage by conduction voltage drop, and the voltage at two ends of the load resistor is reduced to zero. At the moment, the relay switch enters a turn-off steady state, the energy storage power supply has a certain voltage drop due to discharge, and the low-power high-voltage power supply starts to charge the capacitor bank at the moment, so that the voltage of the capacitor bank is recovered to a voltage state required by a test.
Example 2
As shown in fig. 2, the relay switching device full-load testing device powered by a low-power supply comprises a high-voltage circuit and a low-voltage circuit. The high-voltage circuit includes: the low-power high-voltage power supply E, the resistor R and the first switch S1 are connected in series to form a first loop, the output end of the low-power high-voltage power supply E is connected with two collecting terminals of the energy storage capacitor bank C in parallel, and the relay switch device K is connected with the first loop in parallel. The low-voltage circuit includes: the low-voltage power supply Y and the second switch S2 are connected in parallel to form a second loop, and the relay switch device K is connected in parallel with the second loop. The low-voltage circuit further includes: a third switch S3 in series with the second loop.
One end of the resistor R is connected with the negative electrode of the low-power high-voltage power supply E and one output end of the energy storage capacitor bank C respectively, and the other end of the resistor R is connected with the first port of the relay switch device K, one end of the second switch S2 and the negative electrode of the low-voltage power supply Y respectively; the other end of the second switch S2 and the positive electrode of the low-voltage power supply Y are connected to one end of the third switch S3, the other end of the third switch S3 is connected to one end of the first switch S1 and the second port of the relay switch device K, and the other end of the first switch S1 is connected to the positive electrode of the low-power high-voltage power supply E and the other output end of the energy storage capacitor bank C.
The relay switching device includes four actions: turn-on instant, turn-on hold, turn-off instant, turn-off hold. Therefore, the method for reducing the energy cost of the full-load test device of the relay switch device powered by the low-power supply comprises the following steps:
s1: when the relay switch device is in a turn-off holding period, the output voltage of the low-power high-voltage power supply is the test voltage of the relay switch device switch, and the low-power high-voltage power supply is fully charged by the energy storage capacitor bank, so that the high voltage required by the relay switch load condition test is achieved.
S2: the second switch is in a closed conducting state, the third switch is disconnected, the first switch is closed, the relay switch device is in a conducting moment, the energy storage capacitor bank discharges to the relay switch device rapidly, the maximum current amplitude is limited to the rated current of the relay switch by the load resistor, the voltage drop amplitude is less than 10% when the capacitor discharges, and the total capacity of the energy storage capacitor bank needs to be ensured. If the rated current of the relay switch to be tested is large and the current rising speed is slow, a relatively large capacity is needed, and otherwise, a relatively small capacity is needed.
S3: and when the relay switch device is in the on-keeping period, the first switch and the second switch are disconnected, the third switch is closed, and the low-voltage power supply provides rated current for the relay switch device and maintains that the rated current of the whole on-keeping stage flows through the relay switch after the relay switch is switched on. At this time, in the other circuit, the low-power high-voltage power supply starts to charge the energy storage capacitor bank quickly.
S4: the relay switching device is turned off.
The turning-off instant action of step S4 specifically includes the following steps:
s401: after the connection and the maintenance are finished, the relay switch device is quickly disconnected with the low-voltage constant-current power supply, namely the second switch is closed and the third switch is disconnected;
s402: after the second switch is closed and the third switch is disconnected, the relay switch device is immediately reconnected with the energy storage power supply of the high-voltage capacitor bank and the resistance load, the discharging current of the energy storage power supply is still the rated current, the voltage at two ends of the load resistance is the test voltage, and at the moment, the relay switch is immediately turned off, namely, the switching-off transient state is entered. Namely, the first switch is closed, the energy storage capacitor bank discharges to the relay switch device, and the switch of the relay switch device is in the turn-off moment.
The voltage of the relay switch is rapidly increased to a test voltage by conduction voltage drop, and the voltage at two ends of the load resistor is reduced to zero. At the moment, the relay switch enters a turn-off steady state, the energy storage power supply has a certain voltage drop due to discharge, and the low-power high-voltage power supply starts to charge the capacitor bank at the moment, so that the voltage of the capacitor bank is recovered to a voltage state required by a test.
Example 3
As shown in fig. 3, the relay switching device full-load testing device powered by a low-power supply comprises a high-voltage circuit and a low-voltage circuit. The high-voltage circuit includes: the low-power high-voltage power supply E, the resistor R and the first switch S1 are connected in series to form a first loop, the output end of the low-power high-voltage power supply E is connected with two collecting terminals of the energy storage capacitor bank C in parallel, and the relay switch device K is connected with the first loop in parallel. The low-voltage circuit includes: the low-voltage power supply Y and the second switch S2 are connected in parallel to form a second loop, and the relay switch device K is connected in parallel with the second loop.
The first switch S1 is a single pole double throw switch. One end of the resistor R is respectively connected with the negative electrode of the low-power high-voltage power supply E and one output end of the energy storage capacitor bank C, and the other end of the resistor R is respectively connected with the negative electrode of the low-voltage power supply Y, one end of the second switch S2 and the first port of the relay switch device K; the second port of the relay switching device K is connected with the first common port of the first switch S1; a second port of the first switch S1 is connected to the positive electrode of the low-power high-voltage power supply E and the other output terminal of the energy storage capacitor bank C, and a third port of the first switch S1 is connected to the positive electrode of the low-voltage power supply Y and the other end of the second switch S2, respectively.
The relay switching device includes four actions: turn-on instant, turn-on hold, turn-off instant, turn-off hold. Therefore, the method for reducing the energy cost of the full-load test device of the relay switch device powered by the low-power supply comprises the following steps:
s1: when the relay switch device is in a turn-off holding period, the output voltage of the low-power high-voltage power supply is the test voltage of the relay switch device switch, and the low-power high-voltage power supply is fully charged by the energy storage capacitor bank, so that the high voltage required by the relay switch load condition test is achieved.
S2: the second switch is in a closed conducting state, the second port of the first switch is closed (namely the port connected with the power supply E and the capacitor C is closed), the relay switch device is closed, the relay switch device is in an opening moment, the energy storage capacitor bank discharges to the relay switch device rapidly, the maximum current amplitude is limited to the rated current of the relay switch by the load resistor, the voltage drop amplitude is less than 10% when the capacitor discharges, and the total capacity of the energy storage capacitor bank needs to be ensured. If the rated current of the relay switch to be tested is large and the current rising speed is slow, a relatively large capacity is needed, and otherwise, a relatively small capacity is needed.
S3: when the relay switch device is in the on-keeping period, the first port of the first switch is closed (namely the port connected with the power supply Y and the second switch is closed), the second switch is disconnected, the low-voltage power supply provides rated current for the relay switch device, and the rated current of the whole on-keeping stage is maintained to flow through the relay switch after being switched on. At this time, in the other circuit, the low-power high-voltage power supply starts to charge the energy storage capacitor bank quickly.
S4: the relay switching device is turned off.
The turning-off instant action of step S4 specifically includes the following steps:
s401: after the connection and the maintenance are finished, the relay switch device is quickly disconnected with the low-voltage constant-current power supply, namely the second switch is closed;
s402: after the second switch is closed, the relay switch device is immediately reconnected with the energy storage power supply of the high-voltage capacitor bank and the resistance load, the discharging current of the energy storage power supply is still the rated current, the voltage at two ends of the load resistor is the test voltage, and at the moment, the relay switch is immediately turned off, namely, the relay switch enters the turn-off transient state. That is, the first port of the first switch is closed (i.e., the port connected to the power supply Y and the second switch is closed), the energy storage capacitor bank discharges to the relay switch device, and the relay switch device is turned off instantaneously.
The voltage of the relay switch is rapidly increased to a test voltage by conduction voltage drop, and the voltage at two ends of the load resistor is reduced to zero. At the moment, the relay switch enters a turn-off steady state, the energy storage power supply has a certain voltage drop due to discharge, and the low-power high-voltage power supply starts to charge the capacitor bank at the moment, so that the voltage of the capacitor bank is recovered to a voltage state required by a test.
Example 4
As shown in fig. 4, the relay switching device full-load testing device powered by the low-power supply includes a high-voltage circuit and a low-voltage circuit. The high-voltage circuit includes: the low-power high-voltage power supply E, the resistor R, the inductor L and the first switch S1 are connected in series to form a first loop, one output end of the low-power high-voltage power supply E is connected with one collecting terminal of the energy storage capacitor bank C, the other output end of the low-power high-voltage power supply E is connected with one end of the inductor L, the other end of the inductor L is connected with the other collecting terminal of the energy storage capacitor bank C, and the relay switch device K is connected with the first loop in parallel. The low-voltage circuit includes: the low-voltage power supply Y and the second switch S2 are connected in parallel to form a second loop, and the relay switch device K is connected in parallel with the second loop. The low-voltage circuit further includes: a diode D in series with the second loop.
One end of the resistor R is connected with the negative electrode of the low-power high-voltage power supply E and one output end of the energy storage capacitor bank C respectively, and the other end of the resistor R is connected with the first port of the relay switch device K, one end of the second switch S2 and the negative electrode of the low-voltage power supply Y respectively; the other end of the second switch S2 and the anode of the low-voltage power supply Y are connected to the anode of the diode D, the cathode of the diode D is connected to one end of the first switch S1 and the second port of the relay switch device K, and the other end of the first switch S1 is connected to one end of the inductor L and the other output end of the energy storage capacitor bank C. One end of the inductor L is connected with the positive electrode of the low-power high-voltage power supply E.
The inductance L is provided to prevent the charging loop from oscillating. The device is mainly applicable to semiconductor power switching devices, IGBT (insulated gate bipolar transistor), power MOS (metal oxide semiconductor) devices, thyristors, silicon carbide devices and the like.
The power selection of the low power high voltage power supply is determined by the capacity of the capacitor bank and the available charging time. The charging time is short, the total capacity of the capacitor bank is large, the required power of the charging power supply is relatively large, and otherwise, the required power can be smaller. In a high-power load condition test, the duration of the two time periods of on holding and off holding is usually 100 to 1000 times longer than the transient process time. Therefore, the power of the charging power supply can be one percent or even several percent of the rated power of the relay switch, for the relay switch test of 100kW and above, the power supply of the kW grade can be selected, the instantaneous discharge power of the capacitor bank can meet the test intensity requirement, but the cost of the capacitor bank is far lower than that of the high-power supply, so that the total cost of the test can be greatly reduced.
The relay switch device full-load test device adopting the low-power supply to supply power based on the three embodiments can be applied to a power supply time-sharing connection circuit. The utility model discloses can join in marriage a capacitor bank energy storage power and load resistance according to a relay switch and test, also can be far away when experimental relay switch rated power by power pack energy storage power capacity to and open and keep, turn-off when keeping long longer, at this moment the energy storage power only need very short time after discharging can be full of the electricity, make energy storage power have longer free time and wait for next discharge. In this case, a scheme that a plurality of relay switch test loops share one high-power energy storage power supply in a time sharing mode can be used.
As shown in fig. 5, in the full load test of the relay switching device without the energy saving function, the non-energy saving relay switching device test circuit includes a load resistor and the relay switching device connected in series; the main power supply is a low-power high-voltage power supply and an energy storage capacitor bank which are connected in parallel, wherein the capacity of the energy storage capacitor bank is far larger than the rated power of the relay switching device;
the main power supply is connected with a plurality of non-energy-saving relay switch device test circuits with set sequence positions in a time-sharing manner; for the circuit of the current selected sequence position, the main power supply supplies power to the test circuit of the non-energy-saving relay switch device of the selected sequence position between a first safety moment before the relay switch device is switched on and a second safety moment after the relay switch device is switched off; after the second safety moment, the main power supply supplies power to the test circuit of the non-energy-saving relay switch device at the next sequence position; the on-hold time period of any non-energy-saving relay switch device test circuit is shorter than the off-hold time period.
According to another aspect of the present invention, in the power time-sharing connection method of the relay switching device full-load test apparatus using a low-power supply, in the relay switching device full-load test without the energy saving function, the non-energy-saving relay switching device test circuit includes a load resistor and a relay switching device connected in series; a plurality of non-energy-saving relay switch device test circuits with set time sequences are connected with a main power supply in a time-sharing mode, the main power supply is a low-power high-voltage power supply and an energy storage capacitor bank which are connected in parallel, and the method comprises the following steps:
m101: at a first safety moment before the relay switch device is switched on, the main power supply is connected to a non-energy-saving relay switch device test circuit of a selected sequence position;
m102: at a second safety moment after the distance relay switch device is turned off, the main power supply exits from the non-energy-saving relay switch device test circuit at the selected sequence position;
m103: the main power supply is connected to a non-energy-saving relay switch device test circuit of the next sequence position;
the on-hold time period of any non-energy-saving relay switch device test circuit is shorter than the off-hold time period.
In conclusion, after the low-power high-voltage power supply is connected in parallel with the energy storage capacitor bank, the high-power capacitor energy storage power supply can be instantly equivalent to a high-power capacitor energy storage power supply capable of outputting rated voltage and rated current, so that the traditional high-power supply is replaced. This greatly reduces the cost of the test power supply. When power pack energy storage power capacity is far greater than the relay switch rated power of being experimental to and open and keep, turn-off when keeping the long longer condition of time, can also with the utility model discloses a timesharing of power is applied to the power is connected to reduce the cost of power more, improved test efficiency.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.
Claims (7)
1. A full-load test device of a relay switch device powered by a low-power supply is characterized by comprising a high-voltage circuit and a low-voltage circuit, wherein,
the high-voltage circuit includes: the low-power high-voltage power supply, the resistor and the first switch are connected in series to form a first loop, the output end of the low-power high-voltage power supply is connected with two collecting terminals of the energy storage capacitor bank in parallel, and the relay switch device is connected with the first loop in parallel;
the low-voltage circuit includes: the low-voltage power supply and the second switch are connected in parallel to form a second loop, and the relay switch device is connected in parallel with the second loop.
2. The apparatus for testing the full load of a relay switching device supplied with a low power supply according to claim 1, wherein said low voltage circuit further comprises: a diode in series with the second loop;
one end of the resistor is connected with the negative electrode of the low-power high-voltage power supply and one output end of the energy storage capacitor bank, and the other end of the resistor is connected with the first port of the relay switch device, one end of the second switch and the negative electrode of the low-voltage power supply; the other end of the second switch and the positive electrode of the low-voltage power supply are connected with the anode of the diode, the cathode of the diode is respectively connected with one end of the first switch and the second port of the relay switch device, and the other end of the first switch is respectively connected with the positive electrode of the low-power high-voltage power supply and the other output end of the energy storage capacitor bank.
3. The apparatus for testing the full load of a relay switching device supplied with a low power supply according to claim 1, wherein said low voltage circuit further comprises: a third switch in series with the second circuit;
one end of the resistor is connected with the negative electrode of the low-power high-voltage power supply and one output end of the energy storage capacitor bank, and the other end of the resistor is connected with the first port of the relay switch device, one end of the second switch and the negative electrode of the low-voltage power supply; the other end of the second switch and the positive electrode of the low-voltage power supply are connected with one end of a third switch, the other end of the third switch is respectively connected with one end of a first switch and a second port of the relay switch device, and the other end of the first switch is respectively connected with the positive electrode of the low-power high-voltage power supply and the other output end of the energy storage capacitor bank.
4. The full-load test device of the relay switch device powered by the low-power supply as claimed in claim 1, wherein the first switch is a single-pole double-throw switch, one end of the resistor is connected to the negative pole of the low-power high-voltage power supply and one output end of the energy storage capacitor bank, and the other end of the resistor is connected to the negative pole of the low-voltage power supply, one end of the second switch and the first port of the relay switch device; the second port of the relay switching device is connected with the first common port of the first switch; and a second port of the first switch is connected with the anode of the low-power high-voltage power supply and the other output end of the energy storage capacitor bank, and a third port of the first switch is respectively connected with the anode of the low-voltage power supply and the other end of the second switch.
5. The apparatus for testing the full load of a relay switching device supplied with a low power supply according to claim 1, wherein said high voltage circuit further comprises: an inductor coil; one output end of the low-power high-voltage power supply is connected with one collecting wiring end of the energy storage capacitor bank, the other output end of the low-power high-voltage power supply is connected with one end of the inductance coil, and the other end of the inductance coil is connected with the other collecting wiring end of the energy storage capacitor bank.
6. The device for testing the full load of a relay switch device powered by a low-power supply as claimed in any one of claims 1 to 5, wherein the energy storage capacitor bank is composed of a plurality of capacitors connected in parallel and in series.
7. The full-load test apparatus for a relay switching device supplied with a low-power supply according to any one of claims 1 to 5, wherein the relay switching device comprises: the direct current relay, the alternating current relay and the contactor, the solid relay switch device and the semiconductor power switch device, wherein the semiconductor power switch device comprises a power MOS, an IGBT, a thyristor, silicon carbide and a silicon controlled rectifier device.
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| CN202020215386.9U CN213069091U (en) | 2020-02-27 | 2020-02-27 | Relay switch device full-load test device powered by low-power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325370A (en) * | 2021-12-17 | 2022-04-12 | 北京市科通电子继电器总厂有限公司 | Method and circuit for realizing load condition test by dual power supply time-sharing multiplexing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114325370A (en) * | 2021-12-17 | 2022-04-12 | 北京市科通电子继电器总厂有限公司 | Method and circuit for realizing load condition test by dual power supply time-sharing multiplexing |
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