Apparatus and method of monitoring insulation of a DC network that is electrically insulated with respect to the ground potential of a device
First Claim
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1. An apparatus for insulation monitoring of a DC network, the network being electrically insulated with respect to a frame potential of a device that contains the DC network;
- the apparatus comprising;
a switch coupled in the network and selectively operable to electrically isolate a first portion of the network from a second portion of the network;
a first insulation monitoring device electrically coupled to the first portion of the network on a first side of the switch to monitor an insulation resistance of the first portion of the network with respect to the frame potential;
a second insulation monitoring device electrically coupled to the second portion of the network on a second side of the switch to monitor the second portion of the network with respect to the frame potential; and
a non-contacting switch selectively operable in a first state to electrically couple the first insulation monitoring device to the frame potential and to electrically decouple the second insulation monitoring device from the frame potential, and selectively operable in a second state to electrically decoupled the first insulation monitoring device from the frame potential and to electrically couple the second insulation monitoring device to the frame potential.
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Abstract
Insulation monitoring of an electrical network such as a DC network which is electrically insulated with respect to the ground of a device, includes at least two insulation monitoring devices that monitor different network sections, which can be isolated by one or more switches. Non-contacting switches are used to alternatingly connect and isolate respective measuring resistors of the monitoring devices to, and from, ground, as a result of which the insulation monitoring devices can not negatively affect each other'"'"'s measurements.
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Citations
26 Claims
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1. An apparatus for insulation monitoring of a DC network, the network being electrically insulated with respect to a frame potential of a device that contains the DC network;
- the apparatus comprising;
a switch coupled in the network and selectively operable to electrically isolate a first portion of the network from a second portion of the network;
a first insulation monitoring device electrically coupled to the first portion of the network on a first side of the switch to monitor an insulation resistance of the first portion of the network with respect to the frame potential;
a second insulation monitoring device electrically coupled to the second portion of the network on a second side of the switch to monitor the second portion of the network with respect to the frame potential; and
a non-contacting switch selectively operable in a first state to electrically couple the first insulation monitoring device to the frame potential and to electrically decouple the second insulation monitoring device from the frame potential, and selectively operable in a second state to electrically decoupled the first insulation monitoring device from the frame potential and to electrically couple the second insulation monitoring device to the frame potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- the apparatus comprising;
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11. An electrical network for an electric vehicle, the network being electrically insulated with respect to a frame potential of the electric vehicle;
- the network comprising;
at least one power source;
at least one load;
a first switch coupled between the power source and the load, and selectively operable to electrically isolate a first portion of the network from a second portion of the network;
a first insulation monitoring device electrically coupled to the first portion of the network on a first side of the switch to monitor an insulation resistance of the first portion of the network with respect to the frame potential;
a second insulation monitoring device electrically coupled to the second portion of the network on a second side of the switch to monitor the second portion of the network with respect to the frame potential;
a second switch selectively operable in a first state to electrically couple the first insulation monitoring device to the frame potential and to electrically decouple the second insulation monitoring device from the frame potential, and selectively operable in a second state to electrically decoupled the first insulation monitoring device from the frame potential and to electrically couple the second insulation monitoring device to the frame potential; and
at least one controller coupled to control the second switch and to control the first and the second insulation monitoring devices, and the controller configured to evaluate measured values of the insulation resistances. - View Dependent Claims (12, 13, 14, 15, 16)
- the network comprising;
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17. A method of insulation monitoring of an electrical network, the network being electrically insulated with respect to a frame potential of a device that contains the network, at least one power source and at least one load;
- the method comprising;
during a first period, electrically coupling only a first one of a pair of measuring resistors to the frame potential, each of the pair of measuring resistors associated with a respective one of a first and a second measuring device; and
determining an insulation resistance of the network; and
during a second period, electrically coupling only a second one of the pair of measuring resistors to the frame potential; and
determining an insulation resistance of the network. - View Dependent Claims (18, 19, 20, 21)
- the method comprising;
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22. An apparatus for insulation monitoring of an electrical network, the network being electrically insulated with respect to a frame potential of a device that contains the network, the apparatus comprising:
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means for electrically coupling a first and a second measuring resistor to the frame potential, alternatingly;
means for determining an insulation resistance of the network when only the first one of the measuring resistors is electrically coupled to the frame potential; and
means for determining an insulation resistance of the network when only the second one of the measuring resistors is electrically coupled to the frame potential. - View Dependent Claims (23, 24, 25, 26)
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Specification