JPH06249893A - Voltage detecting device - Google Patents

Abstract

PURPOSE:To improve the operation reliability of a voltage detecting device for detecting the charge and power failure state of a main circuit high voltage charge part in a high voltage receiving transforming facility. CONSTITUTION:To judge whether the secondary output voltage of an insulating transformer TR having, as its primary input voltage, the ground voltage of a high voltage cable run (for example, T phase) divided by a series capacitor circuit of capacitors C1 and C2 is a determined value or more, voltage judging parts 1, 2 formed of rectifiers REC using many electronic parts such as semiconductor elements and voltage comparators CP are provided by using the secondary output voltage of the transformer TR as a common input voltage to double the judgment. Further, the voltage detecting device is further provided with a signal monitoring part for judging the charge or non-charge state of the high voltage cable run and also the failure state of both the voltage judging parts 1, 2 according to the combination of the voltage judgment signals outputted by two sets of the voltage judging parts 1, 2, and outputting the results as a charge state signal and a failure alarm signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage detecting device for detecting a charging / discharging state of a main circuit high voltage charging section in a high voltage receiving / transforming facility or the like.

[0002]

2. Description of the Related Art As a conventional voltage detecting device of this type,
A rectifier, a signal amplifier, a voltage comparator, etc., which receives the secondary output voltage of the insulation transformer whose primary input voltage is the ground voltage of the high-voltage path divided by the series capacitor circuit and rectifies it. It is known that there is only one system of a detection unit that detects the charging / discharging state of the high-voltage path by determining whether the secondary output voltage of the transformer is equal to or higher than a predetermined value.

[0003]

Generally, the detection of the charging / discharging state of the main circuit high voltage charging section in the high voltage power receiving and transforming equipment is extremely important in the operation control of the power receiving and transforming equipment, and is also extremely important for preventing personal injury. High reliability is required. However, electronic components such as semiconductor elements are often used in the signal amplification section or the voltage comparison section in the voltage detection device, and there is a risk of device malfunction or device malfunction due to element damage due to surge or the like. .

In view of the above, an object of the present invention is to provide a voltage detecting device which further improves the operation reliability as a device for detecting the charging / discharging state of the high voltage charging section as described above.

[0005]

In order to achieve the above object, the voltage detecting device of the present invention is an insulating transformer which uses as its primary input voltage the ground voltage of a high piezoelectric path divided by a series capacitor circuit. In a voltage detection device that receives a secondary output voltage and outputs a charge state determination signal of the high-voltage path, the voltage detection device includes a rectifier unit for the secondary output voltage of the transformer and a voltage comparison unit, and the secondary output voltage of the transformer is predetermined. It is determined by the voltage comparison unit whether or not the value is equal to or more than the value, and the transformer 2
Two sets of voltage determination units that use the next output voltage as a common input voltage, and a signal monitoring unit that outputs the state-of-charge determination signal of the high-voltage path in accordance with the combination of the voltage determination signals output by the two sets of voltage determination units. Further, the signal monitoring unit is configured such that the high-voltage path is in a charged state when both or one of the two sets of voltage determining units determines that the voltage is present. If both of the voltage determination units make the determination that there is no voltage, it is determined that the high-voltage path is in a non-charged state, and a charge state signal that distinguishes between these states is output. When the voltage determination units make different determinations, it is determined that one of the two voltage determination units is in a failure state and the alarm signal is output.

[0006]

The present invention aims at duplication of the voltage determining section which has a relatively high probability of causing device malfunction or device malfunction due to element damage due to surge or the like, and the voltage output from both voltage determining units. The state of charge of the voltage detection target is determined according to the combination of the determination signals, and at the same time, when the failure of both the voltage determination units is predicted, an alarm is issued to further improve the reliability of the voltage detection device. It is a thing.

That is, regarding the structure of the voltage detecting device for detecting the charging / discharging state of the main circuit high voltage charging part in the high voltage receiving / transforming equipment, etc., the primary voltage to ground of the high piezoelectric path divided by the series capacitor circuit is input. 2 of insulation transformer to be voltage
In order to determine whether or not the next output voltage is equal to or higher than the predetermined value, a voltage determination unit including a voltage rectification unit, a signal amplification unit, a voltage comparison unit, and the like, which are often used with electronic components such as semiconductor elements. Is provided with two sets of the secondary output voltage of the transformer as a common input voltage for duplication, and a signal monitoring unit for making a state determination according to a combination of the voltage determination signals output from each of the two sets of voltage determination units. It is provided.

Here, the signal monitoring unit determines that the high-voltage path is in a charged state when both or one of the two sets of voltage determination units determines that the voltage is present, Further, when both of the voltage determination units make the determination of the absence of the voltage, it is determined that the high-voltage path is in the non-charged state, and a charge state signal that distinguishes between these states is output, and the both voltage are further determined. When the determination units make different determinations, it is determined that one of these voltage determination units is in a faulty state and outputs an alarm signal.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the circuit diagram of FIG.
The duplicated logical value table of FIG. First, in FIG. 1, R, S, and T are high-voltage piezoelectric paths of each phase of the three-phase main circuit, and C ₁ and C.
₂ is, for example, a capacitor for dividing the voltage between the T-phase high piezoelectric path and the ground E, which are connected in series with each other,
TR is a capacitor C ₂ in the capacitor series connection
It is an insulation transformer which uses the terminal voltage of as its primary input voltage.

OA11 is an amplifier whose input voltage is the secondary output voltage of the transformer TR, REC1 is a rectifier,
OA12 is an amplifier, CP1 is a voltage comparator that compares the DC voltage output from the amplifier OA12 with the DC setting voltage specified by the DC power supply B1, and the voltage is changed by these elements which are often used for electronic parts such as semiconductor elements. The determination unit 1 is formed. Similarly, amplifier OA21, rectifier REC2 and amplifier OA
22 and the voltage comparator CP2 using the DC voltage designated by the DC power source B2 as its reference voltage, to form the voltage determination unit 2.

Here, the DC set voltage designated by the DC power supplies B1 and B2 is set to the same value as the reference voltage for determining the state of charge of the high piezoelectric path at the output voltage level of the amplifier OA12 or OA21. OA12 and O
When the output voltage of A21 becomes higher than the respective set voltage, the voltage comparators CP1 and CP2 respectively output the logic signal 1, and when they become low, they output the logic signal 0 respectively.

That is, the voltage judgment units 1 and 2 have the same circuit configuration and are duplicated with the secondary output voltage of the insulation transformer TR as a common input voltage. Further, the voltage to ground of the T-phase high-voltage piezoelectric path, which has been converted to a predetermined voltage level after being converted into a direct current, is compared with the DC set voltage designated by each of the DC power supplies, and the high-voltage path is charged by the both voltage comparators. The logic signal 1 indicating the state or the logic signal 0 indicating the non-charged state, that is, the power failure state is output as the result of each voltage comparison.

Next, the signal monitoring section consisting of the logic elements EX-OR and NOT receives the voltage comparison result signals X and Y from both the voltage comparators CP1 and CP2, and determines the coincidence state judgment result of both signals. The alarm output signal B is output. The signals X, Y and B are combined in a logic element OR and output as a status output signal A for determining the charging status of the high piezoelectric path.

Further, the dual logic value table of Table 1 shows that each of the signals X, Y and B corresponding to the charging state of the high piezoelectric path and the failure state of each of the voltage judging sections and the output signal Z of the element EX-OR. It shows the change pattern of.

[0015]

[Table 1]

In Table 1, the signals X and Y are expressed as logical values by setting the charged state of the high piezoelectric path to 1 and the uncharged state to 0, and the signal B to 0 when the voltage detecting device is normal and 1 when the voltage detecting device is abnormal. To be done. Therefore, the high piezoelectric path is connected to both signals X and Y.
Only when both and are O are in the non-charged state, and other than that are all determined to be in the charged state. However, when both the signals X and Y are not O but have different values, it is determined that the high piezoelectric path is in the charged state and the voltage detection device is in the abnormal state.

[0017]

According to the present invention, a voltage detecting device for detecting a charging / discharging state of a main circuit high voltage charging portion in a high voltage receiving / transforming facility is provided, and a high piezoelectric path divided by a series capacitor circuit with respect to ground. In order to determine whether or not the secondary output voltage of the insulation transformer that uses the voltage as the primary input voltage is greater than or equal to a predetermined value, it is composed of a rectifier and a voltage comparator in which electronic components such as semiconductor elements are frequently used. The voltage monitoring unit is provided with two sets of the secondary output voltage of the transformer as a common input voltage for duplication, and a signal monitoring unit for performing status determination according to the combination of the voltage determination signals output from both voltage determining units. By providing, the reliability of the main circuit high-voltage charging unit for the state of charge detection determination is further improved, and the failure state of both the voltage determination units can be reliably detected. It can further improve the safety of the operation control of the such high power receiving and transforming equipment to this important operation signal generator of through improved reliability of the voltage detecting device itself.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a voltage detection device showing an embodiment of the present invention.

[Explanation of reference numerals] B DC power supply C Main circuit High voltage voltage dividing capacitor (C1, C
2) CP voltage comparator (CP1, CP2) EX-OR logic element OA amplifier (OA11, OA12, OA21, OA22) OR logic element NOT logic element REC rectifier (REC1, REC2) TR isolation transformer

Claims (2)

[Claims] 1. A voltage for receiving a secondary output voltage of an insulating transformer, whose primary input voltage is a ground voltage of a high piezoelectric path divided by a series capacitor circuit, and outputting a charge state determination signal of the high piezoelectric path. In the detection device, the transformer secondary output voltage includes a rectification unit and a voltage comparison unit, and the voltage comparison unit determines whether the transformer secondary output voltage is equal to or higher than a predetermined value. The charge state determination signal of the high-voltage path is output according to a combination of two sets of voltage determination units that use the secondary output voltage of the transformer as a common input voltage and the voltage determination signals output by the two sets of voltage determination units. A voltage detection device comprising a signal monitoring unit. 2. The voltage detecting device according to claim 1, wherein the signal monitoring unit charges the high-voltage path when both or one of the two sets of voltage determining units determines that the voltage is present. In the case where both the voltage determination units determine that there is no voltage, the high-voltage path is determined to be in the non-charged state, and the charge state signal that distinguishes between these states is determined. Is output, and when both of the voltage determination units make different determinations, it is determined that one of the voltage determination units is in a failure state, and an alarm signal is output. Voltage detection device.